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Open Source and information security mailing list archives
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Date: Fri, 4 Sep 2015 13:36:50 -0400 From: Tejun Heo <tj@...nel.org> To: Sasha Levin <sasha.levin@...cle.com> Cc: rostedt@...dmis.org, mingo@...hat.com, axboe@...com, linux-kernel@...r.kernel.org Subject: Re: [PATCH] writeback: verify that underlying dev exists before getting its name Hello, On Fri, Sep 04, 2015 at 01:20:42PM -0400, Sasha Levin wrote: > > Do you have backtrace of this happening? There's a bug in cleanup > > path which causes oops (patch is being tested) and this may just be a > > symptom of the same problem. > > [268773.335933] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN > [268773.337986] Modules linked in: > [268773.338470] CPU: 3 PID: 12812 Comm: trinity-c10 Not tainted 4.2.0-next-20150902-sasha-00045-gd0866f3-dirty #2528 > [268773.339903] task: ffff8802f56e4000 ti: ffff880322e10000 task.ti: ffff880322e10000 > [268773.340943] RIP: 0010:[<ffffffffaa8b8284>] [<ffffffffaa8b8284>] trace_event_raw_event_writeback_dirty_page+0x1b4/0x420 Hmm.... did this happen while or around a device removal event? I'm trying to figure out whether an unregistered bdi can have inodes. Thanks. -- tejun -- 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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