Re: [PATCH] cgroup,freezer: hold cpu_hotplug_lock before freezer_mutex in freezer_css_{online,offline}()

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On Sun, Jun 11, 2023 at 10:48:12PM +0900, Tetsuo Handa wrote:
> syzbot is again reporting circular locking dependency between
> cpu_hotplug_lock and freezer_mutex. Do like what we did with
> commit 57dcd64c7e036299 ("cgroup,freezer: hold cpu_hotplug_lock
> before freezer_mutex").
> 
> Reported-by: syzbot <syzbot+2ab700fe1829880a2ec6@xxxxxxxxxxxxxxxxxxxxxxxxx>
> Closes: https://syzkaller.appspot.com/bug?extid=2ab700fe1829880a2ec6
> Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
> Tested-by: syzbot <syzbot+2ab700fe1829880a2ec6@xxxxxxxxxxxxxxxxxxxxxxxxx>

Tagged w/ the same stable version as the earlier patch and applied to
cgroup/for-6.4-fixes.

Thanks.

-- 
tejun



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