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Date: Tue, 27 May 2008 15:35:10 +0200 From: Jens Axboe <jens.axboe@...cle.com> To: Alexey Dobriyan <adobriyan@...il.com> Cc: torvalds@...l.org, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com Subject: Re: 2.6.26-rc4: RIP __call_for_each_cic+0x20/0x50 On Tue, May 27 2008, Alexey Dobriyan wrote: > On Sat, May 10, 2008 at 02:37:19PM +0400, Alexey Dobriyan wrote: > > > > > > @@ -41,8 +41,8 @@ int put_io_context(struct io_context *ioc) > > > > > > rcu_read_lock(); > > > > > > if (ioc->aic && ioc->aic->dtor) > > > > > > ioc->aic->dtor(ioc->aic); > > > > > > - rcu_read_unlock(); > > > > > > cfq_dtor(ioc); > > > > > > + rcu_read_unlock(); > > > > > > > > > > > > kmem_cache_free(iocontext_cachep, ioc); > > > > > > return 1; > > > > > > > > > > This helps in sense that 3 times bulk cross-compiles finish to the end. > > > > > You'll hear me if another such oops will resurface. > > > > > > > > Still looking good? > > > > > > Yup! > > > > And this with patch in mainline, again with PREEMPT_RCU. > > Ping, this happened again with 2.6.26-rc4 and PREEMPT_RCU. Worrisome... Paul, would you mind taking a quick look at cfq and see if you can detect why breaks with preempt rcu? It's clearly a use-after-free symptom, but I don't see how it can happen. -- Jens Axboe -- 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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