** Branch linked: lp:ubuntu/trusty-proposed/linux-keystone -- You received this bug notification because you are a member of Kernel 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: Fix Committed Status in linux source package in Utopic: Fix Committed 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.duf...@fr.ibm.com> - 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 -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
