linux-kernel - [GIT PULL] cgroup: Fixes for v6.17-rc6

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Message-ID: <aMsJ1J994GFBkKt7@slm.duckdns.org>
Date: Wed, 17 Sep 2025 09:19:48 -1000
From: Tejun Heo <tj@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
	Michal Koutný <mkoutny@...e.com>,
	cgroups@...r.kernel.org
Subject: [GIT PULL] cgroup: Fixes for v6.17-rc6

The following changes since commit 6563623e604e3e235b2cee71190a4972be8f986b:

  docs: cgroup: fixed spelling mistakes in documentation (2025-08-12 10:52:28 -1000)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git/ tags/cgroup-for-6.17-rc6-fixes

for you to fetch changes up to 94a4acfec14615e971eb2c9e1fa6c992c85ff6c6:

  cgroup/psi: Set of->priv to NULL upon file release (2025-08-22 07:47:43 -1000)

----------------------------------------------------------------
cgroup: Fixes for v6.17-rc6

This contains two cgroup changes. Both are pretty low risk.

- Fix deadlock in cgroup destruction when repeatedly mounting/unmounting
  perf_event and net_prio controllers. The issue occurs because
  cgroup_destroy_wq has max_active=1, causing root destruction to wait for
  CSS offline operations that are queued behind it. The fix splits
  cgroup_destroy_wq into three separate workqueues to eliminate the
  blocking.

- Set of->priv to NULL upon file release to make potential bugs to manifest
  as NULL pointer dereferences rather than use-after-free errors.

----------------------------------------------------------------
Chen Ridong (2):
      cgroup: split cgroup_destroy_wq into 3 workqueues
      cgroup/psi: Set of->priv to NULL upon file release

 kernel/cgroup/cgroup.c | 44 +++++++++++++++++++++++++++++++++++++-------
 1 file changed, 37 insertions(+), 7 deletions(-)

-- 
tejun