cgroup: Fixes for v6.19-rc1

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- Fix a race condition in css_rstat_updated() where CMPXCHG without LOCK
   prefix could cause lnode corruption when the flusher runs concurrently
   on another CPU. The issue was introduced in 6.17 and causes memcg stats
   to become corrupted in production.
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Merge tag 'cgroup-for-6.19-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

Pull cgroup fix from Tejun Heo:

 - Fix a race condition in css_rstat_updated() where CMPXCHG without
   LOCK prefix could cause lnode corruption when the flusher runs
   concurrently on another CPU. The issue was introduced in 6.17 and
   causes memcg stats to become corrupted in production.

* tag 'cgroup-for-6.19-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup: rstat: use LOCK CMPXCHG in css_rstat_updated

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This commit is contained in:

Linus Torvalds 2025-12-16 19:21:17 +12:00

parent 8f0b4cce44 3309b63a22

commit 6b63f90fa2

1 changed files with 8 additions and 5 deletions

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kernel/cgroup/rstat.c

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