From: Qian Cai <cai@lca.pw>
To: Tejun Heo <tj@kernel.org>
Cc: Prateek Sood <prsood@codeaurora.org>,
Li Zefan <lizefan@huawei.com>,
cgroups@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: Deadlock due to "cpuset: Make cpuset hotplug synchronous"
Date: Wed, 1 Apr 2020 22:00:31 -0400 [thread overview]
Message-ID: <6AD62381-394F-4742-816B-12DE67DE9788@lca.pw> (raw)
In-Reply-To: <20200325191922.GM162390@mtj.duckdns.org>
> On Mar 25, 2020, at 3:19 PM, Tejun Heo <tj@kernel.org> wrote:
>
> 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.
Tejun, can you back off this commit now given it seems nobody is trying to rescue it?
next prev parent reply other threads:[~2020-04-02 2:00 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-25 19:16 Deadlock due to "cpuset: Make cpuset hotplug synchronous" Qian Cai
2020-03-25 19:19 ` Tejun Heo
2020-03-26 10:15 ` Qais Yousef
2020-04-03 14:55 ` Tejun Heo
2020-04-06 10:55 ` Qais Yousef
2020-04-06 14:34 ` Tejun Heo
2020-04-07 13:07 ` Qais Yousef
2020-04-07 13:35 ` Tejun Heo
2020-04-02 2:00 ` Qian Cai [this message]
2020-04-03 14:54 ` Tejun Heo
2020-03-25 20:20 ` Peter Zijlstra
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