linux-kernel - Re: Kernel crash in icq_free_icq

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Message-ID: <CANejiEUopG3MgUsvGMbkdHKrgBT_c+bir1bApt8p86kQn42huQ@mail.gmail.com>
Date:	Wed, 18 Jan 2012 09:05:26 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Vivek Goyal <vgoyal@...hat.com>,
	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 Tejun Heo <tj@...nel.org>:
> Hello,
>
> On Wed, Jan 18, 2012 at 09:01:00AM +0800, Shaohua Li wrote:
>> 2012/1/18 Vivek Goyal <vgoyal@...hat.com>:
>> >> 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)
>
> Vivek is seeing the problem while switching elevators.  Are you too?
> Or is it during normal operation?
same here. I had some problems when I debug my ioscheduler, but
eventually found even switching cfq and noop can trigger oops.
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