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== 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/

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: architecture-ppc64le bot-comment bugnameltc-119217 severity-critical targetmilestone-inin---
-- 
Ubuntu - unable to use XMON debugger (running ppc64le on PowerVM)
https://bugs.launchpad.net/bugs/1396235
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