Re: [PATCH cgroup/for-7.2-fixes] cgroup: Create the psimon kthread outside of cgroup_mutex

Matt Fleming <[email protected]>
Newsgroups dev.linux.lists.sched-ext,org.kernel.vger.cgroups,org.kernel.vger.linux-kernel,org.kernel.vger.stable
Message-ID <alHaU4MhWzq9kA1i@matt-Precision-5490> 
On Fri, Jul 10, 2026 at 01:49:45PM -1000, Tejun Heo wrote:
> Matt, your reordering trades one deadlock for another: CLONE_INTO_CGROUP
> forks grab cgroup_mutex inside the scx_fork_rwsem read section, so an
> enable racing such a clone deadlocks the other way around. The fork has to
> move out of the locked sections instead. Can you verify this fixes the
> deadlock in your setup?

Thanks for fixing this. I'll test this out ASAP and report back.
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