linux-kernel - Re: [REGRESSION] 4.1-rc6 unloading loop OOPS

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Date:	Thu, 4 Jun 2015 22:43:43 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Stefan Seyfried <stefan.seyfried@...glemail.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION] 4.1-rc6 unloading loop OOPS

On Thu, Jun 4, 2015 at 10:36 PM, Stefan Seyfried
<stefan.seyfried@...glemail.com> wrote:
> Hi Ming,
>
> Am 04.06.2015 um 12:24 schrieb Ming Lei:
>> On Thu, Jun 4, 2015 at 5:11 PM, Stefan Seyfried
>> <stefan.seyfried@...glemail.com> wrote:
>
>>> I can reproduce the backtrace after a reboot once (subsequent modprobe/rmmod loop
>>> do not complain anymore), but not the OOPS.
>>
>> One fix[1] was just merged to linus tree, and could you test that to see if your
>> issue can be addressed?
>>
>> [1] http://marc.info/?t=143201518300001&r=1&w=2
>
> I just tried current Linus' master v4.1-rc6-49-g8a7deb3 which contains
> this commit and do no longer get the Warning
>
> Unfortunately, due to this I cannot really test your patch for the OOPS
> (but the OOPS was only happening once for me, so it was not reliably
> triggered).
>
> Thanks, things work well for me, again :-)

Maybe the freed variable is still usable for you, :-)

Actually I can reproduce the issue every time by just runing following
command in VM:

     sudo modprobe loop;  sleep 1; sudo rmmod loop

Thanks,
Ming

>
> Best regards,
>
>         Stefan
> --
> Stefan Seyfried
> Linux Consultant & Developer -- GPG Key: 0x731B665B
>
> B1 Systems GmbH
> Osterfeldstraße 7 / 85088 Vohburg / http://www.b1-systems.de
> GF: Ralph Dehner / Unternehmenssitz: Vohburg / AG: Ingolstadt,HRB 3537



-- 
Ming Lei
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