#11471 HIGH 1.75-so: Crash in mmp2_pcm_open and related code

Zarro Boogs per Child bugtracker at laptop.org
Mon Dec 12 16:48:44 EST 2011

#11471: Crash in mmp2_pcm_open and related code
           Reporter:  greenfeld      |       Owner:  saadia                           
               Type:  defect         |      Status:  new                              
           Priority:  high           |   Milestone:  1.75-software                    
          Component:  kernel         |     Version:  Development build as of this date
         Resolution:                 |    Keywords:                                   
        Next_action:  test in build  |    Verified:  0                                
Deployment_affected:                 |   Blockedby:                                   
           Blocking:                 |  

Comment(by corbet):

 OK, forcing a resume with a keystroke did (the second time) give me a
 storm of about 80 of those messages - without any 5ms gaps.  Interesting.
 I ran runin overnight (and more) with the suspend interval cut to a couple
 of minutes and never saw this.  Like my teenage daughter, the XO seems to
 respond poorly to being awakened ahead of schedule.  That said, I've only
 seen it happen once, having now been through several s/r cycles.

 Also interesting is that the interrupt does eventually go away, long
 before it gets to the point of triggering the core kernel's spurious
 interrupt handler.  So my hack still works, it just takes a little longer

 So we *could* maybe take the printk() out and declare victory.  I didn't
 do that before because I don't like sweeping weird problems like this
 under the rug.  It would really be nice to figure out why the hardware is
 responding in such a strange way and fix the real problem.

 (Also, sorry if my previous response seemed intemperate; I've had more
 coffee and feel better now...)

Ticket URL: <http://dev.laptop.org/ticket/11471#comment:14>
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