#12100 NORM 4-softw: cl4: panic on shutdown

[Zarro Boogs per Child]

#12100: cl4: panic on shutdown
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           Reporter:  pgf       |       Owner:                                    
               Type:  defect    |      Status:  new                               
           Priority:  normal    |   Milestone:  4-software                        
          Component:  kernel    |     Version:  Development source as of this date
         Resolution:            |    Keywords:                                    
        Next_action:  diagnose  |    Verified:  0                                 
Deployment_affected:            |   Blockedby:                                    
           Blocking:            |  
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Comment(by martin.langhoff):

 I use the ftrace trick from cjb, in a naïve attempt to catch some more
 kernel traffic leading to the hang. No smoking gun, but some stray (and
 strange) messages from psmouse.

 rmmod'ing psmouse does not prevent the panic, so this is probably a red
 herring.

 {{{
 # why is psmouse mixing up serio0 with serio1?
 bash-4.2# mount -t debugfs debugfs /mnt
 bash-4.2# cd /mnt/tracing
 bash-4.2# echo 1 > tracing_on
 bash-4.2# cat trace_pipe & shutdown -h now
 [1] 778
 [   68.495208] dcon_freeze_store: 0
 [   77.747801] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
 [   78.754985] psmouse serio1: Failed to disable mouse on
 olpc_touchpad/serio0
 [   79.754894] psmouse serio1: Failed to deactivate mouse on
 olpc_touchpad/serio0
 [   81.754904] psmouse serio1: Failed to enable mouse on
 olpc_touchpad/serio0
 [   81.754904] psmouse serio1: sentelic: Unable get OPC state.
 [   82.764901] psmouse serio1: Failed to deactivate mouse on
 olpc_touchpad/serio0
 [   84.764977] psmouse serio1: Failed to enable mouse on
 olpc_touchpad/serio0
 [   85.764865] psmouse serio1: Failed to deactivate mouse on
 olpc_touchpad/serio0
 [   87.764916] psmouse serio1: Failed to enable mouse on
 olpc_touchpad/serio0
 [   90.764857] Power down.
 [   90.786456] Kernel panic - not syncing: Attempted to kill init!
 exitcode=0x00000000
 [   90.786456]
 [   90.795652] [<c0015760>] (unwind_backtrace+0x0/0x128) from [<c0402718>]
 (dump_stack+0x20/0x24)
 [   90.795652] [<c0402718>] (dump_stack+0x20/0x24) from [<c0402838>]
 (panic+0x98/0x1d0)
 [   90.811916] [<c0402838>] (panic+0x98/0x1d0) from [<c0024604>]
 (do_exit+0x34c/0x7cc)
 [   90.819582] [<c0024604>] (do_exit+0x34c/0x7cc) from [<c00356a8>]
 (sys_reboot+0x130/0x1e0)
 [   90.827800] [<c00356a8>] (sys_reboot+0x130/0x1e0) from [<c000ed00>]
 (ret_fast_syscall+0x0/0x30)
 }}}

-- 
Ticket URL: <http://dev.laptop.org/ticket/12100#comment:2>
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