linux-kernel - Re: [PATCH] cgroup1: fix leaked context root causing sporadic NULL deref in LTP

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Message-ID: <20210701121133.GA4641@sirena.org.uk>
Date:   Thu, 1 Jul 2021 13:11:33 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Richard Purdie <richard.purdie@...uxfoundation.org>
Cc:     Tejun Heo <tj@...nel.org>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        Al Viro <viro@...iv.linux.org.uk>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>, stable@...r.kernel.org
Subject: Re: [PATCH] cgroup1: fix leaked context root causing sporadic NULL
 deref in LTP

On Wed, Jun 30, 2021 at 11:31:06PM +0100, Richard Purdie wrote:

> Out of interest are you also seeing the proc01 test hang on a non-blocking
> read of /proc/kmsg periodically?

> https://bugzilla.yoctoproject.org/show_bug.cgi?id=14460

> I've not figured out a way to reproduce it at will yet and it seems strace

I've been talking to Ross, he mentioned it but no, rings no bells.

> was enough to unblock it. It seems arm specific.

If it's 32 bit I'm not really doing anything that looks at it.

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