Re: Kernel crash in icq_free_icq_rcu

[Shaohua Li]

2012/1/18 Tejun Heo <tj@xxxxxxxxxx>:
> Hello,
>
> On Wed, Jan 18, 2012 at 09:01:00AM +0800, Shaohua Li wrote:
>> 2012/1/18 Vivek Goyal <vgoyal@xxxxxxxxxx>:
>> >> 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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