linux-kernel - Re: Deadlock due to "cpuset: Make cpuset hotplug synchronous"

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Message-ID: <20200325191922.GM162390@mtj.duckdns.org>
Date:   Wed, 25 Mar 2020 15:19:22 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Qian Cai <cai@....pw>
Cc:     Prateek Sood <prsood@...eaurora.org>,
        Li Zefan <lizefan@...wei.com>, cgroups@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: Deadlock due to "cpuset: Make cpuset hotplug synchronous"

On Wed, Mar 25, 2020 at 03:16:56PM -0400, Qian Cai wrote:
> The linux-next commit a49e4629b5ed (“cpuset: Make cpuset hotplug synchronous”)
> introduced real deadlocks with CPU hotplug as showed in the lockdep splat, since it is
> now making a relation from cpu_hotplug_lock —> cgroup_mutex.

Prateek, can you please take a look? Given that the merge window is just around
the corner, we might have to revert and retry later if it can't be resolved
quickly.

Thanks.

-- 
tejun