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Message #94546
[Bug 1396235] Re: Ubuntu - unable to use XMON debugger (running ppc64le on PowerVM)
$ git tag --contains 3b8a3c01096925a824ed3272601082289d9c23a5
v3.18-rc7
** Also affects: linux (Ubuntu Utopic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Trusty)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Fix Released
** Changed in: linux (Ubuntu Trusty)
Assignee: (unassigned) => Chris J Arges (arges)
** Changed in: linux (Ubuntu Utopic)
Assignee: (unassigned) => Chris J Arges (arges)
** Changed in: linux (Ubuntu Trusty)
Status: New => In Progress
** Changed in: linux (Ubuntu Utopic)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Trusty)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Utopic)
Status: New => In Progress
** Description changed:
+ SRU Justification:
+ [Impact]
+ Users of LE Power8 hardware might not be able to use XMON properly.
+
+ [Test Case]
+ # echo x > /proc/sysrq-trigger
+ This should put us in the xmon debugger without errors.
+
+ [Fix]
+ 3b8a3c01096925a824ed3272601082289d9c23a5 can be cleanly cherry-picked to 3.13/3.16. It only adds cpu_to_be32 macros which shouldn't change the behavior of BE mode CPUs.
+
+ --
+
== Comment: #0 - Laurent Dufour <laurent.dufour@xxxxxxxxxx> - 2014-11-25 10:13:17 ==
---Problem Description---
- Kernel fails to invoke xmon, instead print following messages
+ 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
+ # 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
-
+
+ Machine Type = powervm le
+
---System Hang---
- System is hung
-
+ System is hung
+
---Debugger---
A debugger is not configured
-
+
---Steps to Reproduce---
- see problem description
-
+ see problem description
+
Stack trace output:
- no
-
+ no
+
Oops output:
- see problem description
-
+ 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/
+ 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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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1396235
Title:
Ubuntu - unable to use XMON debugger (running ppc64le on PowerVM)
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Trusty:
In Progress
Status in linux source package in Utopic:
In Progress
Bug description:
SRU Justification:
[Impact]
Users of LE Power8 hardware might not be able to use XMON properly.
[Test Case]
# echo x > /proc/sysrq-trigger
This should put us in the xmon debugger without errors.
[Fix]
3b8a3c01096925a824ed3272601082289d9c23a5 can be cleanly cherry-picked to 3.13/3.16. It only adds cpu_to_be32 macros which shouldn't change the behavior of BE mode CPUs.
--
== 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/
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1396235/+subscriptions
