https://github.com/torvalds/linux
Revision 43626dade36fa74d3329046f4ae2d7fdefe401c6 authored by Tetsuo Handa on 25 August 2022, 08:38:38 UTC, committed by Tejun Heo on 25 August 2022, 17:36:30 UTC
syzbot is hitting percpu_rwsem_assert_held(&cpu_hotplug_lock) warning at
cpuset_attach() [1], for commit 4f7e7236435ca0ab ("cgroup: Fix
threadgroup_rwsem <-> cpus_read_lock() deadlock") missed that
cpuset_attach() is also called from cgroup_attach_task_all().
Add cpus_read_lock() like what cgroup_procs_write_start() does.

Link: https://syzkaller.appspot.com/bug?extid=29d3a3b4d86c8136ad9e [1]
Reported-by: syzbot <syzbot+29d3a3b4d86c8136ad9e@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Fixes: 4f7e7236435ca0ab ("cgroup: Fix threadgroup_rwsem <-> cpus_read_lock() deadlock")
Signed-off-by: Tejun Heo <tj@kernel.org>
1 parent 763f4fb
History
Tip revision: 43626dade36fa74d3329046f4ae2d7fdefe401c6 authored by Tetsuo Handa on 25 August 2022, 08:38:38 UTC
cgroup: Add missing cpus_read_lock() to cgroup_attach_task_all()
Tip revision: 43626da
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