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From: Shaohua Li <shaohua.li@intel.com>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: Tejun Heo <tj@kernel.org>,
	linux kernel mailing list <linux-kernel@vger.kernel.org>,
	Jens Axboe <axboe@kernel.dk>
Subject: Re: Kernel crash in icq_free_icq_rcu
Date: Wed, 18 Jan 2012 09:01:00 +0800	[thread overview]
Message-ID: <CANejiEUfAxR-DFH+eRQUbmc1jKHSkcBP1RxuRQ-9JKLU=1Ds0w@mail.gmail.com> (raw)
In-Reply-To: <20120117220715.GB23527@redhat.com>

2012/1/18 Vivek Goyal <vgoyal@redhat.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)

  reply	other threads:[~2012-01-18  1:01 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-01-17 20:18 Kernel crash in icq_free_icq_rcu Vivek Goyal
2012-01-17 20:19 ` Jens Axboe
2012-01-17 20:40   ` Vivek Goyal
2012-01-17 20:42     ` Jens Axboe
2012-01-17 20:58       ` Vivek Goyal
2012-01-17 21:01         ` Vivek Goyal
2012-01-17 21:48 ` Tejun Heo
2012-01-17 22:07   ` Vivek Goyal
2012-01-18  1:01     ` Shaohua Li [this message]
2012-01-18  1:03       ` Tejun Heo
2012-01-18  1:05         ` Shaohua Li
2012-01-18  1:11           ` Tejun Heo
2012-01-18  1:30             ` Shaohua Li
2012-01-18  2:26               ` Shaohua Li
2012-01-18  4:23                 ` Shaohua Li
2012-01-18  6:03               ` Shaohua Li
2012-01-18 13:51                 ` Vivek Goyal
2012-01-18 14:20                   ` Vivek Goyal
2012-01-18 16:09                     ` Tejun Heo
2012-01-18 16:24                       ` Jens Axboe
2012-01-18 16:31                         ` Jens Axboe
2012-01-18 16:36                           ` Vivek Goyal
2012-01-18 17:10                             ` Tejun Heo
2012-01-18 19:07                               ` Jens Axboe
2012-01-18 19:05                             ` Jens Axboe
2012-01-18 16:55                           ` Tejun Heo
2012-01-18 16:07                 ` Tejun Heo
2012-01-19  1:41                   ` [patch]block: fix NULL icq_cache reference Shaohua Li
2012-01-19  1:43                     ` Tejun Heo
2012-01-19  8:20                     ` Jens Axboe

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