linux-kernel - Re: mips qemu test failures in -next due to "kthread: Fix use-after-free if kthread fork fails"

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Date:   Sun, 28 May 2017 13:45:13 +0200
From:   Vegard Nossum <vegard.nossum@...cle.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Oleg Nesterov <oleg@...hat.com>,
        Jamie Iles <jamie.iles@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: mips qemu test failures in -next due to "kthread: Fix
 use-after-free if kthread fork fails"

On 05/27/17 19:56, Guenter Roeck wrote:
> Hi,
> 
> my qemu testis of mips images are failing in -next. Symptom is a hang during
> boot; see http://kerneltests.org/builders/qemu-mips-next for some examples.
> 
> I bisected the problem in next-20170526. It points to commit 4d6501dce079c
> ("kthread: Fix use-after-free if kthread fork fails"). Reverting that patch
> fixes the problem.
> 
> Bisect log is attached.

Hi,

Thanks for the report and sorry for the breakage :-/

I can't immediately spot what's going wrong, but I am able to reproduce
it on mips so I will try to debug.

Are you sure it's this commit, though? I checked out linus/master and
I get a boot hang even after reverting it.


Vegard