#9662 NORM 1.5-F11: XO-1.5 os39 2.6.31 hang

[Zarro Boogs per Child]

#9662: XO-1.5 os39 2.6.31 hang
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 Reporter:  Quozl   |                 Owner:  dsaxena                           
     Type:  defect  |                Status:  new                               
 Priority:  normal  |             Milestone:  1.5-F11                           
Component:  kernel  |               Version:  Development source as of this date
 Keywords:          |           Next_action:  reproduce                         
 Verified:  0       |   Deployment_affected:                                    
Blockedby:          |              Blocking:                                    
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 While testing performance of sync, the following script caused two XO-1.5
 to hang, either on the first attempt, or a subsequent. Reproducer:

  * power on,
  * wait for Sugar,
  * start Terminal,
  * create a script,
  {{{
 cat > sync-prod << EOF
 #!/bin/bash
 while true; do
     dd if=/dev/urandom of=/dev/dsp count=64
     sync
     dd if=/dev/urandom of=/dev/dsp count=64
     sleep 5
 done
 EOF
 chmod +x sync-prod
 }}}
  * run the script,
  * listen to bursts of noise until they stop,
  * mouse pointer does not move.

 Sometimes the problem does not reproduce.  When that happens, I can cause
 it to reproduce again by doing this:

  * power off,
  * remove battery and DC supply,
  * reinsert battery and DC supply,
  * repeat the reproducer above omitting the creation of the script.

 When I do this, the hang happens after the second dd.

 Reproduced eight times on two XO-1.5.

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Ticket URL: <http://dev.laptop.org/ticket/9662>
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