linux-kernel - Re: [RFC][PATCH] cpu/hotplug: wait for cpuset_hotplug

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Message-ID: <87k0tritvq.fsf@oracle.com>
Date:   Tue, 08 Dec 2020 21:40:57 -0500
From:   Daniel Jordan <daniel.m.jordan@...cle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Alexey Klimov <aklimov@...hat.com>
Cc:     linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        yury.norov@...il.com, tglx@...utronix.de, jobaker@...hat.com,
        audralmitchel@...il.com, arnd@...db.de, gregkh@...uxfoundation.org,
        rafael@...nel.org, tj@...nel.org, lizefan@...wei.com,
        qais.yousef@....com, hannes@...xchg.org, klimov.linux@...il.com
Subject: Re: [RFC][PATCH] cpu/hotplug: wait for cpuset_hotplug_work to
 finish on cpu online

Peter Zijlstra <peterz@...radead.org> writes:
>> The nature of this bug is also described here (with different consequences):
>> https://lore.kernel.org/lkml/20200211141554.24181-1-qais.yousef@arm.com/
>
> Yeah, pesky deadlocks.. someone was going to try again.

I dug up the synchronous patch

    https://lore.kernel.org/lkml/1579878449-10164-1-git-send-email-prsood@codeaurora.org/

but surprisingly wasn't able to reproduce the lockdep splat from

    https://lore.kernel.org/lkml/F0388D99-84D7-453B-9B6B-EEFF0E7BE4CC@lca.pw/

even though I could hit it a few weeks ago.  I'm going to try to mess
with it later, but don't let me hold this up.