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== Comment: #0 - Laurent Dufour <[email protected]> - 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---
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Ubuntu - unable to use XMON debugger (running ppc64le on PowerVM)
https://bugs.launchpad.net/bugs/1396235
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