#9565 BLOC 1.5-F11: system freeze under os33

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#9565: system freeze under os33
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           Reporter:  pgf           |       Owner:               
               Type:  defect        |      Status:  new          
           Priority:  blocker       |   Milestone:  1.5-F11      
          Component:  not assigned  |     Version:  not specified
         Resolution:                |    Keywords:               
        Next_action:  never set     |    Verified:  0            
Deployment_affected:                |   Blockedby:               
           Blocking:                |  
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Comment(by pgf):

 another possibility -- we're spinning with continuous SCI interrupts?
 twice, while acpi debug tracing has been on, i've experienced lockups.

 first time it was continuous like this:

 {{{
 [ 1504.061847]  evevent-0249 [00] ev_fixed_event_detect : Fixed Event
 Block: Enable 00000100 Status 00000801
 [ 1504.072072]    evgpe-0445 [00] ev_gpe_detect         : Read GPE
 Register at GPE0: Status=00, Enable=00
 [ 1504.082025]    evgpe-0445 [00] ev_gpe_detect         : Read GPE
 Register at GPE8: Status=00, Enable=08
 [ 1504.092005] olpc-dcon: scanline interrupt w/CPU
 }}}

 second time like this:

 {{{
 [ 1504.061847]  evevent-0249 [00] ev_fixed_event_detect : Fixed Event
 Block: Enable 00000100 Status 00000801
 [ 1504.072072]    evgpe-0445 [00] ev_gpe_detect         : Read GPE
 Register at GPE0: Status=00, Enable=00
 [ 1504.082025]    evgpe-0445 [00] ev_gpe_detect         : Read GPE
 Register at GPE8: Status=00, Enable=08
 [ 1504.092005] olpc-dcon: scanline interrupt w/CPU
 }}}

 we wouldn't get the dcon message if acpi had handled the interrupt (and
 it's not for dcon either).  this implies an asserted interrupt from
 elsewhere.

 one obvious interrupt source that would cause SCI but not be shown in
 those registers is SMBALRT#.  this source is enabled, because DCONIRQ uses
 it on B2.  i'll do some probing.

-- 
Ticket URL: <http://dev.laptop.org/ticket/9565#comment:1>
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