#8301 BLOC 8.2.0 (: Fast suspend/resume cycle causes a libertas crash

[Zarro Boogs per Child]

#8301: Fast suspend/resume cycle causes a libertas crash
------------------------+---------------------------------------------------
   Reporter:  cjb       |       Owner:  dsaxena                        
       Type:  defect    |      Status:  new                            
   Priority:  blocker   |   Milestone:  8.2.0 (was Update.2)           
  Component:  kernel    |     Version:  not specified                  
 Resolution:            |    Keywords:  blocks-:8.2.0 cjbfor8.2 relnote
Next_action:  diagnose  |    Verified:  0                              
  Blockedby:            |    Blocking:                                 
------------------------+---------------------------------------------------

Comment(by cjb):

 I tried adding a flush_workqueue() before the destroy_workqueue(), with
 the result that we hung in the flush_workqueue() instead -- then I noticed
 that destroy_ calls the same internal function as flush_.  So, I think
 it's safe to say that we're hanging in flush_cpu_workqueue(), and the
 reason is that we're successfully clearing scheduled tasks from the
 runqueue, but we're not successfully clearing the active thread, and we're
 instead blocking on it to return, which it never does.

 I don't know enough about the workqueue API yet to know what the right way
 for a kernel thread to know when to tear itself down immediately is.

-- 
Ticket URL: <http://dev.laptop.org/ticket/8301#comment:33>
One Laptop Per Child <http://laptop.org/>
OLPC bug tracking system