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------- Comment From thierry.fauck@xxxxxxxxxx 2014-12-08 15:57 EDT-------
As patch has been submitted upstream, changing status

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https://bugs.launchpad.net/bugs/1396235

Title:
  Ubuntu - unable to use XMON debugger (running ppc64le on PowerVM)

Status in linux package in Ubuntu:
  New

Bug description:
  == Comment: #0 - Laurent Dufour <laurent.dufour@xxxxxxxxxx> - 2014-11-25 10:13:17 ==
  ---Problem Description---
  Kernel fails to invoke xmon, instead print following messages 

  # echo x > /proc/sysrq-trigger                                   
  [   47.600133] SysRq : Entering xmon                                            
  cpu 0xf: Vector: 0  at [c0000000e8603b80]                                       
      pc: c0000000005610c0: write_sysrq_trigger+0x120/0x260                       
      lr: c0000000005610c0: write_sysrq_trigger+0x120/0x260                       
      sp: c0000000e8603ce0                                                        
     msr: 8000000000009033                                                        
    current = 0xc0000000ef4a0000                                                  
    paca    = 0xc000000007df3480   softe: 0        irq_happened: 0x00             
      pid   = 2303, comm = bash                                                   
  [   47.607247] Bad kernel stack pointer fc7b4b0 at ee27cc4                      
  cpu 0xf: Vector: 300 (Data Access) at [c000000007f37d40]                        
      pc: 000000000ee27cc4                                                        
      lr: 000000000ee27c44                                                        
      sp: fc7b4b0                                                                 
     msr: 8000000000001000                                                        
     dar: 10000000                                                                
   dsisr: 42000000                                                                
    current = 0xc0000000ef4a0000                                                  
    paca    = 0xc000000007df3480   softe: 0        irq_happened: 0x00             
      pid   = 2303, comm = bash                                                   
  cpu 0xf: Exception 300 (Data Access) in xmon, returning to main loop            
  xmon: WARNING: bad recursive fault on cpu 0xf   

  
   
  ---uname output---
  N/A
   
  Machine Type = powervm le 
   
  ---System Hang---
   System is hung
   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
   see problem description
   
  Stack trace output:
   no
   
  Oops output:
   see problem description
   
  System Dump Info:
    The system is not configured to capture a system dump.
   
  This patch has been sent upstream: http://patchwork.ozlabs.org/patch/413744/

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