Song Liu 07c5972951 perf/cgroups: Install cgroup events to correct cpuctx ...

cgroup events are always installed in the cpuctx. However, when it is not
installed via IPI, list_update_cgroup_event() adds it to cpuctx of current
CPU, which triggers list corruption:

  [] list_add double add: new=ffff888ff7cf0db0, prev=ffff888ff7ce82f0, next=ffff888ff7cf0db0.

To reproduce this, we can simply run:

  # perf stat -e cs -a &
  # perf stat -e cs -G anycgroup

Fix this by installing it to cpuctx that contains event->ctx, and the
proper cgrp_cpuctx_list.

Fixes: db0503e4f675 ("perf/core: Optimize perf_install_in_event()")
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20200122195027.2112449-1-songliubraving@fb.com

2020-01-28 21:20:19 +01:00

..

callchain.c

perf/core: Convert to SPDX license identifiers

2019-02-04 08:46:11 +01:00

core.c

perf/cgroups: Install cgroup events to correct cpuctx

2020-01-28 21:20:19 +01:00

hw_breakpoint.c

perf/hw_breakpoint: Fix arch_hw_breakpoint use-before-initialization

2019-09-06 08:24:01 +02:00

internal.h

perf/aux: Allow using AUX data in perf samples

2019-11-13 11:06:14 +01:00

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

ring_buffer.c

perf/aux: Allow using AUX data in perf samples

2019-11-13 11:06:14 +01:00

uprobes.c

mm/mmap.c: use IS_ERR_VALUE to check return value of get_unmapped_area

2019-12-01 06:29:19 -08:00