#12701 NORM 13.2.0: 13.2.0-9 crash in cache_reap kworker (was: 13.2.0-9 crash in runin)

Zarro Boogs per Child bugtracker at laptop.org
Thu Jun 13 18:01:27 EDT 2013

#12701: 13.2.0-9 crash in cache_reap kworker
           Reporter:  Quozl     |       Owner:  dsd                              
               Type:  defect    |      Status:  new                              
           Priority:  normal    |   Milestone:  13.2.0                           
          Component:  kernel    |     Version:  Development build as of this date
         Resolution:            |    Keywords:                                   
        Next_action:  diagnose  |    Verified:  0                                
Deployment_affected:            |   Blockedby:                                   
           Blocking:            |  
Changes (by dsd):

 * cc: wad (added)
  * owner:  => dsd


 Lets characterise this bug according to this particular failure on 13.2.0
 build 9:

 Unable to handle kernel paging request at virtual address XYZ
 PC is at free_block
 LR is at drain_array
 Process kworker (running the cache_reap task)

 often seen a few seconds after resume.

 According to those criteria we have 2 occurances shown here and one more
 at 12688#comment:41

 This seems like random memory corruption which first shows its face when a
 periodic cache reaping task is executed.

Ticket URL: <http://dev.laptop.org/ticket/12701#comment:2>
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