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    SubjectRe: Kernel crash in icq_free_icq_rcu
    From
    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)


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