#9635 LOW 1.5-sof: chvt hangs after telinit 1 followed by telinit 5

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#9635: chvt hangs after telinit 1 followed by telinit 5
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           Reporter:  Quozl     |       Owner:  dsaxena                          
               Type:  defect    |      Status:  new                              
           Priority:  low       |   Milestone:  1.5-software-update              
          Component:  kernel    |     Version:  Development build as of this date
         Resolution:            |    Keywords:  os34 os36 os52 chvt              
        Next_action:  diagnose  |    Verified:  0                                
Deployment_affected:            |   Blockedby:                                   
           Blocking:            |  
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Comment(by Quozl):

 Yes, 100% CPU state due X process is happening at the same time that chvt
 hangs.

 Using initctl doesn't reproduce the symptom chain.  I suspect that the
 single user shell might be contributing ... the block cursor position in
 that VT occasionally relates to the block cursor position overlaying the X
 root window at time of hang.

 "telinit 1" was for several purposes, including stopping Network Manager
 and X, yes.  I don't recall the context of the original discovery and I'm
 hoping it isn't relevant.

 New data: in the hard hang state, there is no response to keyboard or
 serial port originated SysRq despite it being enabled and tested
 beforehand.

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Ticket URL: <http://dev.laptop.org/ticket/9635#comment:8>
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