linux-kernel - Re: Kernel crash in icq_free_icq

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Message-ID: <CANejiEUfAxR-DFH+eRQUbmc1jKHSkcBP1RxuRQ-9JKLU=1Ds0w@mail.gmail.com>
Date:	Wed, 18 Jan 2012 09:01:00 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Tejun Heo <tj@...nel.org>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: Kernel crash in icq_free_icq_rcu

2012/1/18 Vivek Goyal <vgoyal@...hat.com>:
> On Tue, Jan 17, 2012 at 01:48:34PM -0800, Tejun Heo wrote:
>> On Tue, Jan 17, 2012 at 03:18:23PM -0500, Vivek Goyal wrote:
>> > Hi Tejun,
>> >
>> > With latest linus kernel, I see following crash. I was running some
>> > scripts which create cgroups and launch fio jobs in those groups. In
>> > a separate window I wrote a script to change the IO scheduler on the
>> > device in a loop while IO was happening on the device. After few
>> > seconds I see following. So far I tried it twice and reproduced it
>> > both the times in first few seconds.
>>
>> Does the following patch make any difference?
>
> Nope. Still can reproduce the issue.
I had similar issue too. Looks ioc_create_icq finds an icq (in ioc_lookup_icq)
the icq is in rcu free (it has __rcu_icq_cache set)
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