lkml.org 
[lkml]   [2015]   [Sep]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [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


\
 
 \ /
  Last update: 2015-09-04 20:01    [W:0.046 / U:0.164 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site