Messages in this thread |  | | Date | Wed, 09 Sep 2015 14:32:33 -0400 | From | Sasha Levin <> | Subject | Re: [PATCH] writeback: verify that underlying dev exists before getting its name |
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On 09/04/2015 01:36 PM, Tejun Heo wrote: > 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.
I ran some more tests, and I didn't see device removal events close to it.
Thanks, Sasha
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