4b9ce67196
Oliver reported that x86_pmu_del() ended up doing an out-of-bound memory access
when group_sched_in() fails and needs to roll back.
This *should* be handled by the transaction callbacks, but he found that when
the group leader is a software event, the transaction handlers of the wrong PMU
are used. Despite the move_group case in perf_event_open() and group_sched_in()
using pmu_ctx->pmu.
Turns out, inherit uses event->pmu to clone the events, effectively undoing the
move_group case for all inherited contexts. Fix this by also making inherit use
pmu_ctx->pmu, ensuring all inherited counters end up in the same pmu context.
Similarly, __perf_event_read() should use equally use pmu_ctx->pmu for the
group case.
Fixes:
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|---|---|---|
| .. | ||
| Makefile | ||
| callchain.c | ||
| core.c | ||
| hw_breakpoint.c | ||
| hw_breakpoint_test.c | ||
| internal.h | ||
| ring_buffer.c | ||
| uprobes.c | ||