- Fix SCX_KICK_WAIT deadlock where multiple CPUs waiting for each other in
hardirq context form a cycle. Move the wait to a balance callback which
can drop the rq lock and process IPIs.
- Fix inconsistent NUMA node lookup in scx_select_cpu_dfl() where the
waker_node used cpu_to_node() while prev_cpu used
scx_cpu_node_if_enabled(), leading to undefined behavior when per-node
idle tracking is disabled.
-----BEGIN PGP SIGNATURE-----
iIQEABYKACwWIQTfIjM1kS57o3GsC/uxYfJx3gVYGQUCacwiiQ4cdGpAa2VybmVs
Lm9yZwAKCRCxYfJx3gVYGVILAP44s30JBpNyJ9JhAiCoTYzxzOXqqGbotnpQckMF
+7WoJAD/Z9dJO/Sw/AH0fX6WVJDmO0QsQvFXLXJBxWy7A5XVAA0=
=2DW5
-----END PGP SIGNATURE-----
Merge tag 'sched_ext-for-7.0-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext
Pull sched_ext fixes from Tejun Heo:
- Fix SCX_KICK_WAIT deadlock where multiple CPUs waiting for each other
in hardirq context form a cycle. Move the wait to a balance callback
which can drop the rq lock and process IPIs.
- Fix inconsistent NUMA node lookup in scx_select_cpu_dfl() where
the waker_node used cpu_to_node() while prev_cpu used
scx_cpu_node_if_enabled(), leading to undefined behavior when
per-node idle tracking is disabled.
* tag 'sched_ext-for-7.0-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext:
selftests/sched_ext: Add cyclic SCX_KICK_WAIT stress test
sched_ext: Fix SCX_KICK_WAIT deadlock by deferring wait to balance callback
sched_ext: Fix inconsistent NUMA node lookup in scx_select_cpu_dfl()
- Fix false positive stall reports on weakly ordered architectures where
the lockless worklist/timestamp check in the watchdog can observe stale
values due to memory reordering. Recheck under pool->lock to confirm.
-----BEGIN PGP SIGNATURE-----
iIQEABYKACwWIQTfIjM1kS57o3GsC/uxYfJx3gVYGQUCacwiew4cdGpAa2VybmVs
Lm9yZwAKCRCxYfJx3gVYGX66AQCT5ZNUV46mQdQU8TXV4qMiAW1gdwoUT+rvcQ9Q
u2jA/AD/S1uHycAWKqA+TTL8NfNvhgyhgq1AVbYUlTRXCz3iwgU=
=BlI5
-----END PGP SIGNATURE-----
Merge tag 'wq-for-7.0-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
Pull workqueue fix from Tejun Heo:
- Fix false positive stall reports on weakly ordered architectures
where the lockless worklist/timestamp check in the watchdog can
observe stale values due to memory reordering.
Recheck under pool->lock to confirm.
* tag 'wq-for-7.0-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
workqueue: Better describe stall check
workqueue: Fix false positive stall reports
- Fix cgroup rmdir racing with dying tasks. Deferred task cgroup unlink
introduced a window where cgroup.procs is empty but the cgroup is still
populated, causing rmdir to fail with -EBUSY and selftest failures. Make
rmdir wait for dying tasks to fully leave and fix selftests to not depend
on synchronous populated updates.
- Fix cpuset v1 task migration failure from empty cpusets under strict
security policies. When CPU hotplug removes the last CPU from a v1
cpuset, tasks must be migrated to an ancestor without a
security_task_setscheduler() check that would block the migration.
-----BEGIN PGP SIGNATURE-----
iIQEABYKACwWIQTfIjM1kS57o3GsC/uxYfJx3gVYGQUCacwibg4cdGpAa2VybmVs
Lm9yZwAKCRCxYfJx3gVYGXHEAP98nVEKyl7c7+sXYtwOPn8KEhdHkdpHyPZwhpS2
1wLhaQEAm8yO49s7IgvGPWSz0s/gQdmF5/x8RAee0sJsZALvGQg=
=bUUt
-----END PGP SIGNATURE-----
Merge tag 'cgroup-for-7.0-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
Pull cgroup fixes from Tejun Heo:
- Fix cgroup rmdir racing with dying tasks.
Deferred task cgroup unlink introduced a window where cgroup.procs
is empty but the cgroup is still populated, causing rmdir to fail
with -EBUSY and selftest failures.
Make rmdir wait for dying tasks to fully leave and fix selftests to
not depend on synchronous populated updates.
- Fix cpuset v1 task migration failure from empty cpusets under strict
security policies.
When CPU hotplug removes the last CPU from a v1 cpuset, tasks must be
migrated to an ancestor without a security_task_setscheduler() check
that would block the migration.
* tag 'cgroup-for-7.0-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
cgroup/cpuset: Skip security check for hotplug induced v1 task migration
cgroup/cpuset: Simplify setsched decision check in task iteration loop of cpuset_can_attach()
cgroup: Fix cgroup_drain_dying() testing the wrong condition
selftests/cgroup: Don't require synchronous populated update on task exit
cgroup: Wait for dying tasks to leave on rmdir
When a CPU hot removal causes a v1 cpuset to lose all its CPUs, the
cpuset hotplug handler will schedule a work function to migrate tasks
in that cpuset with no CPU to its ancestor to enable those tasks to
continue running.
If a strict security policy is in place, however, the task migration
may fail when security_task_setscheduler() call in cpuset_can_attach()
returns a -EACCES error. That will mean that those tasks will have
no CPU to run on. The system administrators will have to explicitly
intervene to either add CPUs to that cpuset or move the tasks elsewhere
if they are aware of it.
This problem was found by a reported test failure in the LTP's
cpuset_hotplug_test.sh. Fix this problem by treating this special case as
an exception to skip the setsched security check in cpuset_can_attach()
when a v1 cpuset with tasks have no CPU left.
With that patch applied, the cpuset_hotplug_test.sh test can be run
successfully without failure.
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Centralize the check required to run security_task_setscheduler() in
the task iteration loop of cpuset_can_attach() outside of the loop as
it has no dependency on the characteristics of the tasks themselves.
There is no functional change.
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
-----BEGIN PGP SIGNATURE-----
iQEzBAABCAAdFiEEq1nRK9aeMoq1VSgcnJ2qBz9kQNkFAmnLsoQACgkQnJ2qBz9k
QNmnIAgAmJtXFZu/uJiRR6RrxmYzIdznkaZ8aTGeApQfG432goHqPhh1j+TKpe7Q
YwrB90YP6umL16HOyKvci/jNpv7+vFb8sr93FPu8+01AnMJqfvA3IJ+hrzPy6IcX
dqpO4oKr9gqbmf2/9Eny5mv50xcNI3+M7y+xh0MFsKoZxnEb2j4pCKQsPO0qMOZw
Aui1fFb4nXpcWUlIJtNFRuXXR3pQf4n8ZpfywhUCe4FV5RRrwiq6Y8If0Tj8lqgx
2fEwbkkjZkFVlOijNhZSSWKnobwg3oUbpXStZE6Kyw60vZBcQgEKWOAke175v+qf
XMuhiSrSawJDC45SZmb8QtGe8GEV6g==
=gYPI
-----END PGP SIGNATURE-----
Merge tag 'fs_for_v7.0-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
Pull udf fix from Jan Kara:
"Fix for a race in UDF that can lead to memory corruption"
* tag 'fs_for_v7.0-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
udf: Fix race between file type conversion and writeback
mpage: Provide variant of mpage_writepages() with own optional folio handler
Fix missing zeroization of the ChaCha state
-----BEGIN PGP SIGNATURE-----
iIoEABYIADIWIQSacvsUNc7UX4ntmEPzXCl4vpKOKwUCacrR+xQcZWJpZ2dlcnNA
a2VybmVsLm9yZwAKCRDzXCl4vpKOK9IdAQDpZU7HYigXJJxdlLKi5BWqRdMS85Qz
JYAlahqXGLclnQD+KlXc0FFZagy/EwTYNTyXh5Adl1hvhbUvx+hvDrgLwQo=
=0HZN
-----END PGP SIGNATURE-----
Merge tag 'libcrypto-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux
Pull crypto library fix from Eric Biggers:
"Fix missing zeroization of the ChaCha state"
* tag 'libcrypto-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux:
lib/crypto: chacha: Zeroize permuted_state before it leaves scope
- Fix build failure when libbpf does not exist
RTLA supports building without BPF libraries, but a recent change
added a libbpf.h include outside of the BPF protection which caused
build failures when libbpf was not installed.
-----BEGIN PGP SIGNATURE-----
iIoEABYKADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCacqphhQccm9zdGVkdEBn
b29kbWlzLm9yZwAKCRAp5XQQmuv6qjglAQDZFyZlJ5x13SbmxcIkA+pSy7zrWkxt
3hB09dkdY2q2uAEA+PMALreOSF2A1dyH8c6/yuxf3ftcUZH+/XnkQeheows=
=f4XK
-----END PGP SIGNATURE-----
Merge tag 'trace-rtla-v7.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull rtla build fix from Steven Rostedt:
- Fix build failure when libbpf does not exist
RTLA supports building without BPF libraries, but a recent change
added a libbpf.h include outside of the BPF protection which caused
build failures when libbpf was not installed.
* tag 'trace-rtla-v7.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
rtla: Fix build without libbpf header
Add a test that creates a 3-CPU kick_wait cycle (A->B->C->A). A BPF
scheduler kicks the next CPU in the ring with SCX_KICK_WAIT on every
enqueue while userspace workers generate continuous scheduling churn via
sched_yield(). Without the preceding fix, this hangs the machine within seconds.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Christian Loehle <christian.loehle@arm.com>
Tested-by: Christian Loehle <christian.loehle@arm.com>
SCX_KICK_WAIT busy-waits in kick_cpus_irq_workfn() using
smp_cond_load_acquire() until the target CPU's kick_sync advances. Because
the irq_work runs in hardirq context, the waiting CPU cannot reschedule and
its own kick_sync never advances. If multiple CPUs form a wait cycle, all
CPUs deadlock.
Replace the busy-wait in kick_cpus_irq_workfn() with resched_curr() to
force the CPU through do_pick_task_scx(), which queues a balance callback
to perform the wait. The balance callback drops the rq lock and enables
IRQs following the sched_core_balance() pattern, so the CPU can process
IPIs while waiting. The local CPU's kick_sync is advanced on entry to
do_pick_task_scx() and continuously during the wait, ensuring any CPU that
starts waiting for us sees the advancement and cannot form cyclic
dependencies.
Fixes: 90e55164da ("sched_ext: Implement SCX_KICK_WAIT")
Cc: stable@vger.kernel.org # v6.12+
Reported-by: Christian Loehle <christian.loehle@arm.com>
Link: https://lore.kernel.org/r/20260316100249.1651641-1-christian.loehle@arm.com
Signed-off-by: Tejun Heo <tj@kernel.org>
Tested-by: Christian Loehle <christian.loehle@arm.com>
rtla supports building without libbpf. However, BPF actions
patchset [1] adds an include of bpf/libbpf.h into timerlat_bpf.h,
which breaks build on systems that don't have libbpf headers
installed.
This is a leftover from a draft version of the patchset where
timerlat_bpf_set_action() (which takes a struct bpf_program * argument)
was defined in the header. timerlat_bpf.c already includes bpf/libbpf.h
via timerlat.skel.h when libbpf is present.
Remove the redundant include to fix build on systems without libbpf
headers.
[1] https://lore.kernel.org/linux-trace-kernel/20251126144205.331954-1-tglozar@redhat.com/T/
Cc: John Kacur <jkacur@redhat.com>
Cc: Luis Goncalves <lgoncalv@redhat.com>
Cc: Crystal Wood <crwood@redhat.com>
Cc: Costa Shulyupin <costa.shul@redhat.com>
Link: https://patch.msgid.link/20260330091207.16184-1-tglozar@redhat.com
Reported-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Closes: https://lore.kernel.org/linux-trace-kernel/20260329122202.65a8b575@robin/
Fixes: 8cd0f08ac7 ("rtla/timerlat: Support tail call from BPF program")
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
Reviewed-by: Wander Lairson Costa <wander@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Please consider pulling these changes from the signed vfs-7.0-rc6.fixes tag.
Thanks!
Christian
-----BEGIN PGP SIGNATURE-----
iHUEABYKAB0WIQRAhzRXHqcMeLMyaSiRxhvAZXjcogUCacmRjQAKCRCRxhvAZXjc
olJnAQD2iiLqih8Y8nX3ESMkkIQWUoSikrfSVw/GqmuKTmlrDgEA/z+LRgDGnI/+
6xzkEw4UNmJ9JoJsiPSlHq18yyga/ww=
=DxTb
-----END PGP SIGNATURE-----
Merge tag 'vfs-7.0-rc6.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull vfs fixes from Christian Brauner:
- Fix netfs_limit_iter() hitting BUG() when an ITER_KVEC iterator
reaches it via core dump writes to 9P filesystems. Add ITER_KVEC
handling following the same pattern as the existing ITER_BVEC code.
- Fix a NULL pointer dereference in the netfs unbuffered write retry
path when the filesystem (e.g., 9P) doesn't set the prepare_write
operation.
- Clear I_DIRTY_TIME in sync_lazytime for filesystems implementing
->sync_lazytime. Without this the flag stays set and may cause
additional unnecessary calls during inode deactivation.
- Increase tmpfs size in mount_setattr selftests. A recent commit
bumped the ext4 image size to 2 GB but didn't adjust the tmpfs
backing store, so mkfs.ext4 fails with ENOSPC writing metadata.
- Fix an invalid folio access in iomap when i_blkbits matches the folio
size but differs from the I/O granularity. The cur_folio pointer
would not get invalidated and iomap_read_end() would still be called
on it despite the IO helper owning it.
- Fix hash_name() docstring.
- Fix read abandonment during netfs retry where the subreq variable
used for abandonment could be uninitialized on the first pass or
point to a deleted subrequest on later passes.
- Don't block sync for filesystems with no data integrity guarantees.
Add a SB_I_NO_DATA_INTEGRITY superblock flag replacing the per-inode
AS_NO_DATA_INTEGRITY mapping flag so sync kicks off writeback but
doesn't wait for flusher threads. This fixes a suspend-to-RAM hang on
fuse-overlayfs where the flusher thread blocks when the fuse daemon
is frozen.
- Fix a lockdep splat in iomap when reads fail. iomap_read_end_io()
invokes fserror_report() which calls igrab() taking i_lock in hardirq
context while i_lock is normally held with interrupts enabled. Kick
failed read handling to a workqueue.
- Remove the redundant netfs_io_stream::front member and use
stream->subrequests.next instead, fixing a potential issue in the
direct write code path.
* tag 'vfs-7.0-rc6.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
netfs: Fix the handling of stream->front by removing it
iomap: fix lockdep complaint when reads fail
writeback: don't block sync for filesystems with no data integrity guarantees
netfs: Fix read abandonment during retry
vfs: fix docstring of hash_name()
iomap: fix invalid folio access when i_blkbits differs from I/O granularity
selftests/mount_setattr: increase tmpfs size for idmapped mount tests
fs: clear I_DIRTY_TIME in sync_lazytime
netfs: Fix NULL pointer dereference in netfs_unbuffered_write() on retry
netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators
Bunch of driver fixes for:
- Xilinx regmap init error handling, dma_device directions, residue
calculation, reset related timeout fixes.
- Renesas CHCTRL updates and driver list fixes
- DW HDMA cycle bits and MSI data programming fix
- IDXD pile of fixes for memeory leak and FLR fixes
-----BEGIN PGP SIGNATURE-----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=MxNf
-----END PGP SIGNATURE-----
Merge tag 'dmaengine-fix-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine
Pull dmaengine fixes from Vinod Koul:
"A bunch of driver fixes with idxd ones being the biggest:
- Xilinx regmap init error handling, dma_device directions, residue
calculation, and reset related timeout fixes
- Renesas CHCTRL updates and driver list fixes
- DW HDMA cycle bits and MSI data programming fix
- IDXD pile of fixes for memeory leak and FLR fixes"
* tag 'dmaengine-fix-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine: (21 commits)
dmaengine: xilinx_dma: Fix reset related timeout with two-channel AXIDMA
dmaengine: xilinx: xilinx_dma: Fix unmasked residue subtraction
dmaengine: xilinx: xilinx_dma: Fix residue calculation for cyclic DMA
dmaengine: xilinx: xilinx_dma: Fix dma_device directions
dmaengine: sh: rz-dmac: Move CHCTRL updates under spinlock
dmaengine: sh: rz-dmac: Protect the driver specific lists
dmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()
dmaengine: xilinx: xdma: Fix regmap init error handling
dmaengine: dw-edma: Fix multiple times setting of the CYCLE_STATE and CYCLE_BIT bits for HDMA.
dmaengine: idxd: Fix leaking event log memory
dmaengine: idxd: Fix freeing the allocated ida too late
dmaengine: idxd: Fix memory leak when a wq is reset
dmaengine: idxd: Fix not releasing workqueue on .release()
dmaengine: idxd: Wait for submitted operations on .device_synchronize()
dmaengine: idxd: Flush all pending descriptors
dmaengine: idxd: Flush kernel workqueues on Function Level Reset
dmaengine: idxd: Fix possible invalid memory access after FLR
dmaengine: idxd: Fix crash when the event log is disabled
dmaengine: idxd: Fix lockdep warnings when calling idxd_device_config()
dmaengine: dw-edma: fix MSI data programming for multi-IRQ case
...
designware: fix resume-probe race causing NULL-deref in amdisp
imx: fix timeout on repeated reads and extra clock at end
MAINTAINERS: drop outdated I2C website
-----BEGIN PGP SIGNATURE-----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=3asa
-----END PGP SIGNATURE-----
Merge tag 'i2c-for-7.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c fixes from Wolfram Sang:
- designware: fix resume-probe race causing NULL-deref in amdisp
- imx: fix timeout on repeated reads and extra clock at end
- MAINTAINERS: drop outdated I2C website
* tag 'i2c-for-7.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
MAINTAINERS: drop outdated I2C website
i2c: designware: amdisp: Fix resume-probe race condition issue
i2c: imx: ensure no clock is generated after last read
i2c: imx: fix i2c issue when reading multiple messages
* Lots of small and not-so-small fixes for the newly rewritten gmap,
mostly affecting the handling of nested guests.
x86:
* Fix an issue with shadow paging, which causes KVM to install an MMIO PTE
in the shadow page tables without first zapping a non-MMIO SPTE if KVM
didn't see the write that modified the shadowed guest PTE. While commit
a54aa15c6b was right about it being impossible to miss such a write
if it was coming from the guest, it failed to account for writes to
guest memory that are outside the scope of KVM: if userspace modifies
the guest PTE, and then the guest hits a relevant page fault, KVM will
get confused.
-----BEGIN PGP SIGNATURE-----
iQFIBAABCgAyFiEE8TM4V0tmI4mGbHaCv/vSX3jHroMFAmnH3j8UHHBib256aW5p
QHJlZGhhdC5jb20ACgkQv/vSX3jHroOWRQf7BD1dgyO9Id+Y/QQJPzZ0z/zGbNWT
jLDTpapxSB960AybvmkOl0pgr7AJrNN+iWQ5cbod/41NKEdJn++ME++NFQlt15oH
gZAMdVr72qklyVFOq3BZhQRskleGo35A/YYznKf+re4tdvL5fynyYTLDwVkDR4NU
tCwHCg+B6bVSNOLjxMm5eOpDXoboGiwohFYay7IclsXibjDlKyFaj9mZPJW1E6qy
SUp+nuseUTf8RFFscNTsW6XRPa/Y7RctPBNQuGSiw3rxFXsq+VyD6Y/AOklbdeyz
8u+25gdKm65sdXFmLWIN1Ogec0DcKMgdNpFrgEj+9PPWyHDHikqksv/vRw==
=/YA7
-----END PGP SIGNATURE-----
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm fixes from Paolo Bonzini:
"s390:
- Lots of small and not-so-small fixes for the newly rewritten gmap,
mostly affecting the handling of nested guests.
x86:
- Fix an issue with shadow paging, which causes KVM to install an
MMIO PTE in the shadow page tables without first zapping a non-MMIO
SPTE if KVM didn't see the write that modified the shadowed guest
PTE.
While commit a54aa15c6b ("KVM: x86/mmu: Handle MMIO SPTEs
directly in mmu_set_spte()") was right about it being impossible to
miss such a write if it was coming from the guest, it failed to
account for writes to guest memory that are outside the scope of
KVM: if userspace modifies the guest PTE, and then the guest hits a
relevant page fault, KVM will get confused"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE
KVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE
KVM: s390: Fix KVM_S390_VCPU_FAULT ioctl
KVM: s390: vsie: Fix guest page tables protection
KVM: s390: vsie: Fix unshadowing while shadowing
KVM: s390: vsie: Fix refcount overflow for shadow gmaps
KVM: s390: vsie: Fix nested guest memory shadowing
KVM: s390: Correctly handle guest mappings without struct page
KVM: s390: Fix gmap_link()
KVM: s390: vsie: Fix check for pre-existing shadow mapping
KVM: s390: Remove non-atomic dat_crstep_xchg()
KVM: s390: vsie: Fix dat_split_ste()
-----BEGIN PGP SIGNATURE-----
iJEEABYKADkWIQRTLbB6QfY48x44uB6AXGG7T9hjvgUCackzVhsUgAAAAAAEAA5t
YW51MiwyLjUrMS4xMiwyLDIACgkQgFxhu0/YY75+AAEA54Z8n7PQ4NCdd3NxtfZY
vopaMNY5NbBzMpzZpPo/uNkA/R/zfRogLx9pLiBh4LgJIzNe3nSK7NUsKBZVXxo6
jcEL
=8HbQ
-----END PGP SIGNATURE-----
Merge tag 'for-linus-7.0a-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fix from Juergen Gross:
"A single fix for a very rare bug introduced in rc5"
* tag 'for-linus-7.0a-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen/privcmd: unregister xenstore notifier on module exit
- Fix an early boot crash in AMD SEV-SNP guests, caused by incorrect
FSGSBASE init ordering. (Nikunj A Dadhania)
- Remove X86_CR4_FRED from the CR4 pinned bits mask, to fix a race
window during the bootup of SEV-{ES,SNP} or TDX guests, which
can crash them if they trigger exceptions in that window.
(Borislav Petkov)
- Fix early boot failures on SEV-ES/SNP guests, due to incorrect
early GHCB access. (Nikunj A Dadhania)
- Add clarifying comment to the CRn pinning logic, to avoid
future confusion & bugs. (Peter Zijlstra)
Signed-off-by: Ingo Molnar <mingo@kernel.org>
-----BEGIN PGP SIGNATURE-----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=I3Gh
-----END PGP SIGNATURE-----
Merge tag 'x86-urgent-2026-03-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
- Fix an early boot crash in AMD SEV-SNP guests, caused by incorrect
FSGSBASE init ordering (Nikunj A Dadhania)
- Remove X86_CR4_FRED from the CR4 pinned bits mask, to fix a race
window during the bootup of SEV-{ES,SNP} or TDX guests, which can
crash them if they trigger exceptions in that window (Borislav
Petkov)
- Fix early boot failures on SEV-ES/SNP guests, due to incorrect early
GHCB access (Nikunj A Dadhania)
- Add clarifying comment to the CRn pinning logic, to avoid future
confusion & bugs (Peter Zijlstra)
* tag 'x86-urgent-2026-03-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/cpu: Add comment clarifying CRn pinning
x86/fred: Fix early boot failures on SEV-ES/SNP guests
x86/cpu: Remove X86_CR4_FRED from the CR4 pinned bits mask
x86/cpu: Enable FSGSBASE early in cpu_init_exception_handling()
which may cause missed expirations or incorrect overrun accounting.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
-----BEGIN PGP SIGNATURE-----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=hDiV
-----END PGP SIGNATURE-----
Merge tag 'timers-urgent-2026-03-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer fix from Ingo Molnar:
"Fix an argument order bug in the alarm timer forwarding logic, which
may cause missed expirations or incorrect overrun accounting"
* tag 'timers-urgent-2026-03-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
alarmtimer: Fix argument order in alarm_timer_forward()
- Tighten up the sys_futex_requeue() ABI a bit, to disallow
dissimilar futex flags and potential UaF access. (Peter Zijlstra)
- Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
(Hao-Yu Yang)
- Clear stale exiting pointer in futex_lock_pi() retry path,
which bug triggered a warning (and potential misbehavior)
in stress-testing. (Davidlohr Bueso)
Signed-off-by: Ingo Molnar <mingo@kernel.org>
-----BEGIN PGP SIGNATURE-----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=85AU
-----END PGP SIGNATURE-----
Merge tag 'locking-urgent-2026-03-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull futex fixes from Ingo Molnar:
- Tighten up the sys_futex_requeue() ABI a bit, to disallow dissimilar
futex flags and potential UaF access (Peter Zijlstra)
- Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
(Hao-Yu Yang)
- Clear stale exiting pointer in futex_lock_pi() retry path, which
triggered a warning (and potential misbehavior) in stress-testing
(Davidlohr Bueso)
* tag 'locking-urgent-2026-03-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
futex: Clear stale exiting pointer in futex_lock_pi() retry path
futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
futex: Require sys_futex_requeue() to have identical flags
-----BEGIN PGP SIGNATURE-----
iQIzBAABCAAdFiEE9zuTYTs0RXF+Ke33EVvVyTe/1WoFAmnI69IACgkQEVvVyTe/
1WqWmxAAn7Bbd9vh6botvvRoMwSlvPOE3oexRbpr+EMCE3Z9mulKi//KoiOk1xxW
nzg41gXQ2ZvsCys8M/5tloo4U0YRZQthf3SyEyvl/c/wGRWvSZYdv86iV5/Qhkwf
VaAT0Kh/V5Rffg1f1xYIVlt4TRbcbKTj9lr1bPnPGEbAY96Dav0gYMn2+29I1642
l6CpWtM2OZCalDK/j0zG6Wxxeko84pT0iv6kxGba3roQVONzYWXycgW3caR4DJq2
l4D81QCG1NhV984MP3UChHPoTa1gUepE6fOhyyTwXrWn8bEdkFXtHgKaC90PirP0
OeYYK7sRx4yrsRcpBsuo83lpCP7aMIiGpU9hrbABdQ2qF9o1/hZyggU+FdKv+dri
6SIw1w+wHpa2gDoSsze9uCsoc/jPflCzBgfo1w1jbGf3kctwmMSnWpkVBhCIwtD4
ntoTWk2MzmLNXCDCrjb1r6SpYgnxrGDcRf6KikF89hkVmWO3wSYzscbaVQz1+R4b
QKBF67zmYoubYPPZ503Y5n7S4L3O8kxGMCGCBx10FIvs8Lvf8dGwTBL+gOtmg1VK
YO99lreo+BN3Q3iui1h2F4wT+XY1Iaq2ORaxi3czjblMfu/rkpcwHS2O6FlecvCQ
Vfgve+6xGuYHMeziDkSiczA2m+8USIefA0zXzwq+2TA82hs95b4=
=sSP0
-----END PGP SIGNATURE-----
Merge tag 'ovl-fixes-7.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs
Pull overlayfs fixes from Amir Goldstein:
- Fix regression in 'xino' feature detection
I clumsily introduced this regression myself when working on another
subsystem (fsnotify). Both the regression and the fix have almost no
visible impact on users except for some kmsg prints.
- Fix to performance regression in v6.12.
This regression was reported by Google COS developers.
It is not uncommon these days for the year-old mature LTS to get
adopted by distros and get exposed to many new workloads. We made a
sub-smart move of making a behavior change in v6.12 which could
impact performance, without making it opt-in. Fixing this mistake
retroactively, to be picked by LTS.
* tag 'ovl-fixes-7.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs:
ovl: make fsync after metadata copy-up opt-in mount option
ovl: fix wrong detection of 32bit inode numbers
Add a test issue an ext4 warning (not a WARN_ON) if there are still
dirty pages attached to an evicted inode.
A lot of ext4 bug fixes including:
* Fix a number of Syzkaller issues.
* Fix memory leaks on error paths.
* Replace some BUG and WARN with EFSCORRUPTED reporting.
* Fix a potential crash when disabling discard via remount followed
by an immediate unmount. (Found by Sashiko)
* Fix a corner case which could lead to allocating blocks for an
indirect-mapped inode block numbers > 2**32.
* Fix a race when reallocating a freed inode that could result in
a deadlock.
* Fix a user-after-free in update_super_work when racing with umount.
* Fix build issues when trying to build ext4's kunit tests as a module
* Fix a bug where ext4_split_extent_zeroout() could fail to pass
back an error from ext4_ext_dirty().
* Avoid allocating blocks from a corrupted block group in
ext4_mb_find_by_goal().
* Fix a percpu_counters list corruption BUG triggered by an
ext4 extents kunit.
* Fix a potetial crash caused by the fast commit flush path potentially
accessing the jinode structure before it is fully initialized.
* Fix fsync(2) in no-journal mode to make sure the dirtied inode is
write to storage.
* Fix a bug when in no-journal mode, when ext4 tries to avoid using
recently deleted inodes, if lazy itable initialization is enabled,
can lead to an unitialized inode getting skipped and triggering
an e2fsck complaint.
* Fix journal credit calculation when setting an xattr when both
the encryption and ea_inode feeatures are enabled.
* Fix corner cases which could result in stale xarray tags after
writeback.
* Fix generic/475 failures caused by ENOSPC errors while creating
a symlink when the system crashes resulting to a file system
inconsistency when replaying the fast commit journal.
-----BEGIN PGP SIGNATURE-----
iQEzBAABCAAdFiEEK2m5VNv+CHkogTfJ8vlZVpUNgaMFAmnIo3cACgkQ8vlZVpUN
gaNu+wf+PyZyRFar37GVcXiMWm8wiBrH7XYhcH1z+uEfjxtWuxUDtKZtF/UZ8FiW
peRI785hiIW1xjj3efkNlrg4JFPlY+mLlyY8iUabYj6Gt2kddgy7h6gCf2ugM/V9
1fk9Hf3+QQ38qM9PpBpBVZyhSS7WpafCcUvx622G/+WiQldWAohpfk/KrNQtSWiX
ZFzJtJ+7jJD6Qo1Pe2Em4khsZK2fsLw1XH9GpUWIdauQV+oXnkp7+kOQIOoT+7RX
azjAub5b6L3Bf9p/NNvlUCE9VINeqjKHVGI/gesRz9uiQd/zI3/pBQtddMUy8B3k
buN3uii5iYcLQD8ntX5sTP35PQg4hg==
=Ew20
-----END PGP SIGNATURE-----
Merge tag 'ext4_for_linus-7.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
Pull ext4 fixes from Ted Ts'o:
- Update the MAINTAINERS file to add reviewers for the ext4 file system
- Add a test issue an ext4 warning (not a WARN_ON) if there are still
dirty pages attached to an evicted inode.
- Fix a number of Syzkaller issues
- Fix memory leaks on error paths
- Replace some BUG and WARN with EFSCORRUPTED reporting
- Fix a potential crash when disabling discard via remount followed by
an immediate unmount. (Found by Sashiko)
- Fix a corner case which could lead to allocating blocks for an
indirect-mapped inode block numbers > 2**32
- Fix a race when reallocating a freed inode that could result in a
deadlock
- Fix a user-after-free in update_super_work when racing with umount
- Fix build issues when trying to build ext4's kunit tests as a module
- Fix a bug where ext4_split_extent_zeroout() could fail to pass back
an error from ext4_ext_dirty()
- Avoid allocating blocks from a corrupted block group in
ext4_mb_find_by_goal()
- Fix a percpu_counters list corruption BUG triggered by an ext4
extents kunit
- Fix a potetial crash caused by the fast commit flush path potentially
accessing the jinode structure before it is fully initialized
- Fix fsync(2) in no-journal mode to make sure the dirtied inode is
write to storage
- Fix a bug when in no-journal mode, when ext4 tries to avoid using
recently deleted inodes, if lazy itable initialization is enabled,
can lead to an unitialized inode getting skipped and triggering an
e2fsck complaint
- Fix journal credit calculation when setting an xattr when both the
encryption and ea_inode feeatures are enabled
- Fix corner cases which could result in stale xarray tags after
writeback
- Fix generic/475 failures caused by ENOSPC errors while creating a
symlink when the system crashes resulting to a file system
inconsistency when replaying the fast commit journal
* tag 'ext4_for_linus-7.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (27 commits)
ext4: always drain queued discard work in ext4_mb_release()
ext4: handle wraparound when searching for blocks for indirect mapped blocks
ext4: skip split extent recovery on corruption
ext4: fix iloc.bh leak in ext4_fc_replay_inode() error paths
ext4: fix deadlock on inode reallocation
ext4: fix use-after-free in update_super_work when racing with umount
ext4: fix the might_sleep() warnings in kvfree()
ext4: reject mount if bigalloc with s_first_data_block != 0
ext4: fix extents-test.c is not compiled when EXT4_KUNIT_TESTS=M
ext4: fix mballoc-test.c is not compiled when EXT4_KUNIT_TESTS=M
ext4: introduce EXPORT_SYMBOL_FOR_EXT4_TEST() helper
jbd2: gracefully abort on checkpointing state corruptions
ext4: avoid infinite loops caused by residual data
ext4: validate p_idx bounds in ext4_ext_correct_indexes
ext4: test if inode's all dirty pages are submitted to disk
ext4: minor fix for ext4_split_extent_zeroout()
ext4: avoid allocate block from corrupted group in ext4_mb_find_by_goal()
ext4: kunit: extents-test: lix percpu_counters list corruption
ext4: publish jinode after initialization
ext4: replace BUG_ON with proper error handling in ext4_read_inline_folio
...
-----BEGIN PGP SIGNATURE-----
iQIzBAABCgAdFiEE8rQSAMVO+zA4DBdWxWXV+ddtWDsFAmnIO1oACgkQxWXV+ddt
WDuLDQ//eWEAvqyA7ch+aLNm0QVHqsdH3NdVFjqw/3NsZfC9A3txTpQmmWpfqIUl
Yqb3AVIdRqwdytinn3xX17SxkJxzCWExcQ8LckoiJ2ODhLoi/vWGnaK8sUBzUDsm
2etvLGbDmhEEpkTMtIFkbY8fhprqthGCQgRHNrn/cZ+AzwohaboinvACysQJSLlH
Nqv0YxnAxsaGIaGD7wigjZ7a2BDoSZ/Q82+RvacrOkyqEThSOqzLmfl++fmHfxQo
UDzVOt9RSUnZ5LU4MYjF3H5otLczqKqRuoQC66ulIkvCml07jaKxfUVJyjkQ3dzZ
//UiylTXnC6XK/x1ayRrM73dKkXoN9mBmvH4b2FnOQJ3D3oyiCuytEF8s4nCrE+P
Zml+OTvIvWMj7Xy2U7cTMWuQGeggZ1m4nxCRScZBEnububUzt13izODwE7C8Cx1y
5FvfFIkiyeBrI03bWUO48H38lwWsfIKj6KnEk1SUeZIARClnZfM4NGZ7MbxjcntG
SunXzuQAywOZCkpskUDWMASLSH6CEGG4zgHPmbzw1NSCE5ZCHFZYXG7znv4w3CTW
TTeowG9r9cgdVBnMUTIToNWuD0jSMLmUfEPWvcwZF9ptfXdoABsPEQZTrKTLeiq7
TVdunKWzU12ZLr2sl4iku8U4H4aNQFoAwV3XqKnG8VXmzN41+Zw=
=I6JH
-----END PGP SIGNATURE-----
Merge tag 'for-7.0-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs fixes from David Sterba:
"A few more fixes. There's one that stands out in size as it fixes an
edge case in fsync.
- fix issue on fsync where file with zero size appears as a non-zero
after log replay
- in zlib compression, handle a crash when data alignment causes
folio reference issues
- fix possible crash with enabled tracepoints on a overlayfs mount
- handle device stats update error
- on zoned filesystems, fix kobject leak on sub-block groups
- fix super block offset in an error message in validation"
* tag 'for-7.0-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: fix lost error when running device stats on multiple devices fs
btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()
btrfs: zlib: handle page aligned compressed size correctly
btrfs: fix leak of kobject name for sub-group space_info
btrfs: fix zero size inode with non-zero size after log replay
btrfs: fix super block offset in error message in btrfs_validate_super()
There's a 3-patch series of DAMON fixes from Josh Law and SeongJae Park.
The rest are singletons - please see the changelogs for details.
-----BEGIN PGP SIGNATURE-----
iHUEABYKAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCacgT5AAKCRDdBJ7gKXxA
jgYVAQDLam92lD7fD0IwdOFE36zlOcJNK4WjHSEf2y9fFFnUWQD/QPnVX+q7fR5t
ZE8ZKhVkMa2w6A2VISdt9Msqm++5RQg=
=oCV1
-----END PGP SIGNATURE-----
Merge tag 'mm-hotfixes-stable-2026-03-28-10-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull misc fixes from Andrew Morton:
"10 hotfixes. 8 are cc:stable. 9 are for MM.
There's a 3-patch series of DAMON fixes from Josh Law and SeongJae
Park. The rest are singletons - please see the changelogs for details"
* tag 'mm-hotfixes-stable-2026-03-28-10-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
mm/mseal: update VMA end correctly on merge
bug: avoid format attribute warning for clang as well
mm/pagewalk: fix race between concurrent split and refault
mm/memory: fix PMD/PUD checks in follow_pfnmap_start()
mm/damon/sysfs: check contexts->nr in repeat_call_fn
mm/damon/sysfs: check contexts->nr before accessing contexts_arr[0]
mm/damon/sysfs: fix param_ctx leak on damon_sysfs_new_test_ctx() failure
mm/swap: fix swap cache memcg accounting
MAINTAINERS, mailmap: update email address for Harry Yoo
mm/huge_memory: fix folio isn't locked in softleaf_to_folio()
As stated on the website: "This wiki has been archived and the content
is no longer updated." No need to reference it.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
- Fix potential deadlock in osnoise and hotplug
The interface_lock can be called by a osnoise thread and the CPU shutdown
logic of osnoise can wait for this thread to finish. But cpus_read_lock()
can also be taken while holding the interface_lock. This produces a
circular lock dependency and can cause a deadlock.
Swap the ordering of cpus_read_lock() and the interface_lock to have
interface_lock taken within the cpus_read_lock() context to prevent this
circular dependency.
- Fix freeing of event triggers in early boot up
If the same trigger is added on the kernel command line, the second
one will fail to be applied and the trigger created will be freed.
This calls into the deferred logic and creates a kernel thread to do
the freeing. But the command line logic is called before kernel
threads can be created and this leads to a NULL pointer dereference.
Delay freeing event triggers until late init.
-----BEGIN PGP SIGNATURE-----
iIoEABYKADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCacf2GBQccm9zdGVkdEBn
b29kbWlzLm9yZwAKCRAp5XQQmuv6qooZAQDQgsnrkwkUHc2WjhAAsZunjWhqRQOp
SIdOO95pDvQwewEAjjP6kG5UEppL8eNF9WmV8EMz9pjYo7i2/Wy59H6xnwQ=
=6Rs0
-----END PGP SIGNATURE-----
Merge tag 'trace-v7.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull tracing fixes from Steven Rostedt:
- Fix potential deadlock in osnoise and hotplug
The interface_lock can be called by a osnoise thread and the CPU
shutdown logic of osnoise can wait for this thread to finish. But
cpus_read_lock() can also be taken while holding the interface_lock.
This produces a circular lock dependency and can cause a deadlock.
Swap the ordering of cpus_read_lock() and the interface_lock to have
interface_lock taken within the cpus_read_lock() context to prevent
this circular dependency.
- Fix freeing of event triggers in early boot up
If the same trigger is added on the kernel command line, the second
one will fail to be applied and the trigger created will be freed.
This calls into the deferred logic and creates a kernel thread to do
the freeing. But the command line logic is called before kernel
threads can be created and this leads to a NULL pointer dereference.
Delay freeing event triggers until late init.
* tag 'trace-v7.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
tracing: Drain deferred trigger frees if kthread creation fails
tracing: Fix potential deadlock in cpu hotplug with osnoise
- Add array_index_nospec() to syscall dispatch table lookup to prevent
limited speculative out-of-bounds access with user-controlled syscall
number
- Mark array_index_mask_nospec() __always_inline since GCC may emit an
out-of-line call instead of the inline data dependency sequence the
mitigation relies on
- Clear r12 on kernel entry to prevent potential speculative use of user
value in system_call, ext/io/mcck interrupt handlers
-----BEGIN PGP SIGNATURE-----
iQEzBAABCgAdFiEE3QHqV+H2a8xAv27vjYWKoQLXFBgFAmnHIWsACgkQjYWKoQLX
FBgwnwgAhPc5rPBk6rG9BAnertIUC+f7NhXkepryLJctPTldaUvycx6aR+o9wizd
7LEiur6duGAg7enWpaRa9FVthOk5tytbkGfU/MijJBoZovX5mZX7U0Ky4WcN+D7B
nFo+CfhWt+jNC6DVZzqhQVrdCxES42olnadLbTbhq5t975lJFgCwJOCcciupawWt
9Lx/YVHym9xlX4iE+sbc0yWGgicGn7JsPsHjfn5ci4WGgF2uhmF3FFfhVSzYJDZK
b8TaodVBebzwREy0s0RKmbQAuT/R01sL16yAayHCL6smerAbNPN62oREEIDz2IS+
fAC/4R7/+nsYQcVpGA/DxztbzK69Uw==
=V6om
-----END PGP SIGNATURE-----
Merge tag 's390-7.0-6' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 fixes from Vasily Gorbik:
- Add array_index_nospec() to syscall dispatch table lookup to prevent
limited speculative out-of-bounds access with user-controlled syscall
number
- Mark array_index_mask_nospec() __always_inline since GCC may emit an
out-of-line call instead of the inline data dependency sequence the
mitigation relies on
- Clear r12 on kernel entry to prevent potential speculative use of
user value in system_call, ext/io/mcck interrupt handlers
* tag 's390-7.0-6' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/entry: Scrub r12 register on kernel entry
s390/syscalls: Add spectre boundary for syscall dispatch table
s390/barrier: Make array_index_mask_nospec() __always_inline
Fuzzying/stressing futexes triggered:
WARNING: kernel/futex/core.c:825 at wait_for_owner_exiting+0x7a/0x80, CPU#11: futex_lock_pi_s/524
When futex_lock_pi_atomic() sees the owner is exiting, it returns -EBUSY
and stores a refcounted task pointer in 'exiting'.
After wait_for_owner_exiting() consumes that reference, the local pointer
is never reset to nil. Upon a retry, if futex_lock_pi_atomic() returns a
different error, the bogus pointer is passed to wait_for_owner_exiting().
CPU0 CPU1 CPU2
futex_lock_pi(uaddr)
// acquires the PI futex
exit()
futex_cleanup_begin()
futex_state = EXITING;
futex_lock_pi(uaddr)
futex_lock_pi_atomic()
attach_to_pi_owner()
// observes EXITING
*exiting = owner; // takes ref
return -EBUSY
wait_for_owner_exiting(-EBUSY, owner)
put_task_struct(); // drops ref
// exiting still points to owner
goto retry;
futex_lock_pi_atomic()
lock_pi_update_atomic()
cmpxchg(uaddr)
*uaddr ^= WAITERS // whatever
// value changed
return -EAGAIN;
wait_for_owner_exiting(-EAGAIN, exiting) // stale
WARN_ON_ONCE(exiting)
Fix this by resetting upon retry, essentially aligning it with requeue_pi.
Fixes: 3ef240eaff ("futex: Prevent exit livelock")
Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260326001759.4129680-1-dave@stgolabs.net
Boot-time trigger registration can fail before the trigger-data cleanup
kthread exists. Deferring those frees until late init is fine, but the
post-boot fallback must still drain the deferred list if kthread
creation never succeeds.
Otherwise, boot-deferred nodes can accumulate on
trigger_data_free_list, later frees fall back to synchronously freeing
only the current object, and the older queued entries are leaked
forever.
To trigger this, add the following to the kernel command line:
trace_event=sched_switch trace_trigger=sched_switch.traceon,sched_switch.traceon
The second traceon trigger will fail and be freed. This triggers a NULL
pointer dereference and crashes the kernel.
Keep the deferred boot-time behavior, but when kthread creation fails,
drain the whole queued list synchronously. Do the same in the late-init
drain path so queued entries are not stranded there either.
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260324221326.1395799-3-atwellwea@gmail.com
Fixes: 61d445af0a ("tracing: Add bulk garbage collection of freeing event_trigger_data")
Signed-off-by: Wesley Atwell <atwellwea@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Previously we stored the end of the current VMA in curr_end, and then upon
iterating to the next VMA updated curr_start to curr_end to advance to the
next VMA.
However, this doesn't take into account the fact that a VMA might be
updated due to a merge by vma_modify_flags(), which can result in curr_end
being stale and thus, upon setting curr_start to curr_end, ending up with
an incorrect curr_start on the next iteration.
Resolve the issue by setting curr_end to vma->vm_end unconditionally to
ensure this value remains updated should this occur.
While we're here, eliminate this entire class of bug by simply setting
const curr_[start/end] to be clamped to the input range and VMAs, which
also happens to simplify the logic.
Link: https://lkml.kernel.org/r/20260327173104.322405-1-ljs@kernel.org
Fixes: 6c2da14ae1 ("mm/mseal: rework mseal apply logic")
Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Reported-by: Antonius <antonius@bluedragonsec.com>
Closes: https://lore.kernel.org/linux-mm/CAK8a0jwWGj9-SgFk0yKFh7i8jMkwKm5b0ao9=kmXWjO54veX2g@mail.gmail.com/
Suggested-by: David Hildenbrand (ARM) <david@kernel.org>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Reviewed-by: Pedro Falcato <pfalcato@suse.de>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Jeff Xu <jeffxu@chromium.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
follow_pfnmap_start() suffers from two problems:
(1) We are not re-fetching the pmd/pud after taking the PTL
Therefore, we are not properly stabilizing what the lock actually
protects. If there is concurrent zapping, we would indicate to the
caller that we found an entry, however, that entry might already have
been invalidated, or contain a different PFN after taking the lock.
Properly use pmdp_get() / pudp_get() after taking the lock.
(2) pmd_leaf() / pud_leaf() are not well defined on non-present entries
pmd_leaf()/pud_leaf() could wrongly trigger on non-present entries.
There is no real guarantee that pmd_leaf()/pud_leaf() returns something
reasonable on non-present entries. Most architectures indeed either
perform a present check or make it work by smart use of flags.
However, for example loongarch checks the _PAGE_HUGE flag in pmd_leaf(),
and always sets the _PAGE_HUGE flag in __swp_entry_to_pmd(). Whereby
pmd_trans_huge() explicitly checks pmd_present(), pmd_leaf() does not do
that.
Let's check pmd_present()/pud_present() before assuming "the is a present
PMD leaf" when spotting pmd_leaf()/pud_leaf(), like other page table
handling code that traverses user page tables does.
Given that non-present PMD entries are likely rare in VM_IO|VM_PFNMAP, (1)
is likely more relevant than (2). It is questionable how often (1) would
actually trigger, but let's CC stable to be sure.
This was found by code inspection.
Link: https://lkml.kernel.org/r/20260323-follow_pfnmap_fix-v1-1-5b0ec10872b3@kernel.org
Fixes: 6da8e9634b ("mm: new follow_pfnmap API")
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
damon_sysfs_repeat_call_fn() calls damon_sysfs_upd_tuned_intervals(),
damon_sysfs_upd_schemes_stats(), and
damon_sysfs_upd_schemes_effective_quotas() without checking contexts->nr.
If nr_contexts is set to 0 via sysfs while DAMON is running, these
functions dereference contexts_arr[0] and cause a NULL pointer
dereference. Add the missing check.
For example, the issue can be reproduced using DAMON sysfs interface and
DAMON user-space tool (damo) [1] like below.
$ sudo damo start --refresh_interval 1s
$ echo 0 | sudo tee \
/sys/kernel/mm/damon/admin/kdamonds/0/contexts/nr_contexts
Link: https://patch.msgid.link/20260320163559.178101-3-objecting@objecting.org
Link: https://lkml.kernel.org/r/20260321175427.86000-4-sj@kernel.org
Link: https://github.com/damonitor/damo [1]
Fixes: d809a7c64b ("mm/damon/sysfs: implement refresh_ms file internal work")
Signed-off-by: Josh Law <objecting@objecting.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org> [6.17+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Multiple sysfs command paths dereference contexts_arr[0] without first
verifying that kdamond->contexts->nr == 1. A user can set nr_contexts to
0 via sysfs while DAMON is running, causing NULL pointer dereferences.
In more detail, the issue can be triggered by privileged users like
below.
First, start DAMON and make contexts directory empty
(kdamond->contexts->nr == 0).
# damo start
# cd /sys/kernel/mm/damon/admin/kdamonds/0
# echo 0 > contexts/nr_contexts
Then, each of below commands will cause the NULL pointer dereference.
# echo update_schemes_stats > state
# echo update_schemes_tried_regions > state
# echo update_schemes_tried_bytes > state
# echo update_schemes_effective_quotas > state
# echo update_tuned_intervals > state
Guard all commands (except OFF) at the entry point of
damon_sysfs_handle_cmd().
Link: https://lkml.kernel.org/r/20260321175427.86000-3-sj@kernel.org
Fixes: 0ac32b8aff ("mm/damon/sysfs: support DAMOS stats")
Signed-off-by: Josh Law <objecting@objecting.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org> [5.18+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Patch series "mm/damon/sysfs: fix memory leak and NULL dereference
issues", v4.
DAMON_SYSFS can leak memory under allocation failure, and do NULL pointer
dereference when a privileged user make wrong sequences of control. Fix
those.
This patch (of 3):
When damon_sysfs_new_test_ctx() fails in damon_sysfs_commit_input(),
param_ctx is leaked because the early return skips the cleanup at the out
label. Destroy param_ctx before returning.
Link: https://lkml.kernel.org/r/20260321175427.86000-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20260321175427.86000-2-sj@kernel.org
Fixes: f0c5118ebb ("mm/damon/sysfs: catch commit test ctx alloc failure")
Signed-off-by: Josh Law <objecting@objecting.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org> [6.18+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
The swap readahead path was recently refactored and while doing this, the
order between the charging of the folio in the memcg and the addition of
the folio in the swap cache was inverted.
Since the accounting of the folio is done while adding the folio to the
swap cache and the folio is not charged in the memcg yet, the accounting
is then done at the node level, which is wrong.
Fix this by charging the folio in the memcg before adding it to the swap cache.
Link: https://lkml.kernel.org/r/20260320050601.1833108-1-alex@ghiti.fr
Fixes: 2732acda82 ("mm, swap: use swap cache as the swap in synchronize layer")
Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Acked-by: Kairui Song <kasong@tencent.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Nhat Pham <nphamcs@gmail.com>
Acked-by: Chris Li <chrisl@kernel.org>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Baoquan He <bhe@redhat.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
On arm64 server, we found folio that get from migration entry isn't locked
in softleaf_to_folio(). This issue triggers when mTHP splitting and
zap_nonpresent_ptes() races, and the root cause is lack of memory barrier
in softleaf_to_folio(). The race is as follows:
CPU0 CPU1
deferred_split_scan() zap_nonpresent_ptes()
lock folio
split_folio()
unmap_folio()
change ptes to migration entries
__split_folio_to_order() softleaf_to_folio()
set flags(including PG_locked) for tail pages folio = pfn_folio(softleaf_to_pfn(entry))
smp_wmb() VM_WARN_ON_ONCE(!folio_test_locked(folio))
prep_compound_page() for tail pages
In __split_folio_to_order(), smp_wmb() guarantees page flags of tail pages
are visible before the tail page becomes non-compound. smp_wmb() should
be paired with smp_rmb() in softleaf_to_folio(), which is missed. As a
result, if zap_nonpresent_ptes() accesses migration entry that stores tail
pfn, softleaf_to_folio() may see the updated compound_head of tail page
before page->flags.
This issue will trigger VM_WARN_ON_ONCE() in pfn_swap_entry_folio()
because of the race between folio split and zap_nonpresent_ptes()
leading to a folio incorrectly undergoing modification without a folio
lock being held.
This is a BUG_ON() before commit 93976a2034 ("mm: eliminate further
swapops predicates"), which in merged in v6.19-rc1.
To fix it, add missing smp_rmb() if the softleaf entry is migration entry
in softleaf_to_folio() and softleaf_to_page().
[tujinjiang@huawei.com: update function name and comments]
Link: https://lkml.kernel.org/r/20260321075214.3305564-1-tujinjiang@huawei.com
Link: https://lkml.kernel.org/r/20260319012541.4158561-1-tujinjiang@huawei.com
Fixes: e9b61f1985 ("thp: reintroduce split_huge_page()")
Signed-off-by: Jinjiang Tu <tujinjiang@huawei.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Cc: Barry Song <baohua@kernel.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nanyong Sun <sunnanyong@huawei.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
While reviewing recent ext4 patch[1], Sashiko raised the following
concern[2]:
> If the filesystem is initially mounted with the discard option,
> deleting files will populate sbi->s_discard_list and queue
> s_discard_work. If it is then remounted with nodiscard, the
> EXT4_MOUNT_DISCARD flag is cleared, but the pending s_discard_work is
> neither cancelled nor flushed.
[1] https://lore.kernel.org/r/20260319094545.19291-1-qiang.zhang@linux.dev/
[2] https://sashiko.dev/#/patchset/20260319094545.19291-1-qiang.zhang%40linux.dev
The concern was valid, but it had nothing to do with the patch[1].
One of the problems with Sashiko in its current (early) form is that
it will detect pre-existing issues and report it as a problem with the
patch that it is reviewing.
In practice, it would be hard to hit deliberately (unless you are a
malicious syzkaller fuzzer), since it would involve mounting the file
system with -o discard, and then deleting a large number of files,
remounting the file system with -o nodiscard, and then immediately
unmounting the file system before the queued discard work has a change
to drain on its own.
Fix it because it's a real bug, and to avoid Sashiko from raising this
concern when analyzing future patches to mballoc.c.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Fixes: 55cdd0af2b ("ext4: get discard out of jbd2 commit kthread contex")
Cc: stable@kernel.org
Commit 4865c768b5 ("ext4: always allocate blocks only from groups
inode can use") restricts what blocks will be allocated for indirect
block based files to block numbers that fit within 32-bit block
numbers.
However, when using a review bot running on the latest Gemini LLM to
check this commit when backporting into an LTS based kernel, it raised
this concern:
If ac->ac_g_ex.fe_group is >= ngroups (for instance, if the goal
group was populated via stream allocation from s_mb_last_groups),
then start will be >= ngroups.
Does this allow allocating blocks beyond the 32-bit limit for
indirect block mapped files? The commit message mentions that
ext4_mb_scan_groups_linear() takes care to not select unsupported
groups. However, its loop uses group = *start, and the very first
iteration will call ext4_mb_scan_group() with this unsupported
group because next_linear_group() is only called at the end of the
iteration.
After reviewing the code paths involved and considering the LLM
review, I determined that this can happen when there is a file system
where some files/directories are extent-mapped and others are
indirect-block mapped. To address this, add a safety clamp in
ext4_mb_scan_groups().
Fixes: 4865c768b5 ("ext4: always allocate blocks only from groups inode can use")
Cc: Jan Kara <jack@suse.cz>
Reviewed-by: Baokun Li <libaokun@linux.alibaba.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Link: https://patch.msgid.link/20260326045834.1175822-1-tytso@mit.edu
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
ext4_split_extent_at() retries after ext4_ext_insert_extent() fails by
refinding the original extent and restoring its length. That recovery is
only safe for transient resource failures such as -ENOSPC, -EDQUOT, and
-ENOMEM.
When ext4_ext_insert_extent() fails because the extent tree is already
corrupted, ext4_find_extent() can return a leaf path without p_ext.
ext4_split_extent_at() then dereferences path[depth].p_ext while trying to
fix up the original extent length, causing a NULL pointer dereference while
handling a pre-existing filesystem corruption.
Do not enter the recovery path for corruption errors, and validate p_ext
after refinding the extent before touching it. This keeps the recovery path
limited to cases it can actually repair and turns the syzbot-triggered crash
into a proper corruption report.
Fixes: 716b9c23b8 ("ext4: refactor split and convert extents")
Reported-by: syzbot+1ffa5d865557e51cb604@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=1ffa5d865557e51cb604
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Signed-off-by: hongao <hongao@uniontech.com>
Link: https://patch.msgid.link/EF77870F23FF9C90+20260324015815.35248-1-hongao@uniontech.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
During code review, Joseph found that ext4_fc_replay_inode() calls
ext4_get_fc_inode_loc() to get the inode location, which holds a
reference to iloc.bh that must be released via brelse().
However, several error paths jump to the 'out' label without
releasing iloc.bh:
- ext4_handle_dirty_metadata() failure
- sync_dirty_buffer() failure
- ext4_mark_inode_used() failure
- ext4_iget() failure
Fix this by introducing an 'out_brelse' label placed just before
the existing 'out' label to ensure iloc.bh is always released.
Additionally, make ext4_fc_replay_inode() propagate errors
properly instead of always returning 0.
Reported-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Fixes: 8016e29f43 ("ext4: fast commit recovery path")
Signed-off-by: Baokun Li <libaokun@linux.alibaba.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260323060836.3452660-1-libaokun@linux.alibaba.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Currently there is a race in ext4 when reallocating freed inode
resulting in a deadlock:
Task1 Task2
ext4_evict_inode()
handle = ext4_journal_start();
...
if (IS_SYNC(inode))
handle->h_sync = 1;
ext4_free_inode()
ext4_new_inode()
handle = ext4_journal_start()
finds the bit in inode bitmap
already clear
insert_inode_locked()
waits for inode to be
removed from the hash.
ext4_journal_stop(handle)
jbd2_journal_stop(handle)
jbd2_log_wait_commit(journal, tid);
- deadlocks waiting for transaction handle Task2 holds
Fix the problem by removing inode from the hash already in
ext4_clear_inode() by which time all IO for the inode is done so reuse
is already fine but we are still before possibly blocking on transaction
commit.
Reported-by: "Lai, Yi" <yi1.lai@linux.intel.com>
Link: https://lore.kernel.org/all/abNvb2PcrKj1FBeC@ly-workstation
Fixes: 88ec797c46 ("fs: make insert_inode_locked() wait for inode destruction")
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260320090428.24899-2-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Commit b98535d091 ("ext4: fix bug_on in start_this_handle during umount
filesystem") moved ext4_unregister_sysfs() before flushing s_sb_upd_work
to prevent new error work from being queued via /proc/fs/ext4/xx/mb_groups
reads during unmount. However, this introduced a use-after-free because
update_super_work calls ext4_notify_error_sysfs() -> sysfs_notify() which
accesses the kobject's kernfs_node after it has been freed by kobject_del()
in ext4_unregister_sysfs():
update_super_work ext4_put_super
----------------- --------------
ext4_unregister_sysfs(sb)
kobject_del(&sbi->s_kobj)
__kobject_del()
sysfs_remove_dir()
kobj->sd = NULL
sysfs_put(sd)
kernfs_put() // RCU free
ext4_notify_error_sysfs(sbi)
sysfs_notify(&sbi->s_kobj)
kn = kobj->sd // stale pointer
kernfs_get(kn) // UAF on freed kernfs_node
ext4_journal_destroy()
flush_work(&sbi->s_sb_upd_work)
Instead of reordering the teardown sequence, fix this by making
ext4_notify_error_sysfs() detect that sysfs has already been torn down
by checking s_kobj.state_in_sysfs, and skipping the sysfs_notify() call
in that case. A dedicated mutex (s_error_notify_mutex) serializes
ext4_notify_error_sysfs() against kobject_del() in ext4_unregister_sysfs()
to prevent TOCTOU races where the kobject could be deleted between the
state_in_sysfs check and the sysfs_notify() call.
Fixes: b98535d091 ("ext4: fix bug_on in start_this_handle during umount filesystem")
Cc: Jiayuan Chen <jiayuan.chen@linux.dev>
Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jiayuan Chen <jiayuan.chen@shopee.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260319120336.157873-1-jiayuan.chen@linux.dev
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Now, only EXT4_KUNIT_TESTS=Y testcase will be compiled in 'extents.c'.
To solve this issue, the ext4 test code needs to be decoupled. The
'extents-test' module is compiled into 'ext4-test' module.
Fixes: cb1e0c1d1f ("ext4: kunit tests for extent splitting and conversion")
Signed-off-by: Ye Bin <yebin10@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260314075258.1317579-4-yebin@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Linus Torvalds
Waiman Long
Tejun Heo
Tomas Glozar
Wolfram Sang
Davidlohr Bueso
Wesley Atwell
Lorenzo Stoakes (Oracle)
Arnd Bergmann
Max Boone
David Hildenbrand (Arm)
Josh Law
Alexandre Ghiti
Harry Yoo (Oracle)
Jinjiang Tu
Theodore Ts'o
hongao
Baokun Li
Jan Kara
Jiayuan Chen
Zqiang
Helen Koike
Ye Bin