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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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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