SRU request submitted:
https://lists.ubuntu.com/archives/kernel-team/2018-May/092543.html

** Description changed:

+ == SRU Justification ==
+ IBM reports a kernel crash with Bionic while in degraded mode(Degraded
+ cores).
+ 
+ IBM created a patch to resolve this bug and has submitted it upstream:
+ https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-May/172835.html
+ 
+ The patch has not laned in mainline as of yet, so it is being submitted
+ as a SAUCE patch.
+ 
+ 
+ == Fix ==
+ UBUNTU: SAUCE: powerpc/perf: Fix memory allocation for core-imc based on 
num_possible_cpus()
+ 
+ == Regression Potential ==
+ Low.  Limited to powerpc.
+ 
+ == Test Case ==
+ A test kernel was built with this patch and tested by the original bug 
reporter.
+ The bug reporter states the test kernel resolved the bug.
+ 
+ 
+ 
  kernel crash
  
  The system is going down NOW!
  Sent SIGTERM to all processes
  Sent SIGKILL to all processes
  [   64.713154] kexec_core: Starting new kernel
  [  156.281504630,5] OPAL: Switch to big-endian OS
  [  158.440263459,5] OPAL: Switch to little-endian OS
  [    1.889211] Unable to handle kernel paging request for data at address 
0x678e549df9e2878c
  [    1.889289] Faulting instruction address: 0xc00000000038aa30
  [    1.889344] Oops: Kernel access of bad area, sig: 11 [#1]
  [    1.889386] LE SMP NR_CPUS=2048 NUMA PowerNV
  [    1.889432] Modules linked in:
  [    1.889468] CPU: 3 PID: 1 Comm: swapper/0 Not tainted 4.15.0-20-generic 
#21-Ubuntu
  [    1.889545] NIP:  c00000000038aa30 LR: c00000000038aa1c CTR: 
0000000000000000
  [    1.889608] REGS: c000003fed193840 TRAP: 0380   Not tainted  
(4.15.0-20-generic)
  [    1.889670] MSR:  9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE>  CR: 28000884 
 XER: 20040000
- [    1.889742] CFAR: c000000000016e1c SOFTE: 1 
- [    1.889742] GPR00: c00000000038a914 c000003fed193ac0 c0000000016eae00 
0000000000000001 
- [    1.889742] GPR04: c000003fd754c7f8 000000000000002c 0000000000000001 
000000000000002b 
- [    1.889742] GPR08: 678e549df9e28874 0000000000000000 0000000000000000 
fffffffffffffffe 
- [    1.889742] GPR12: 0000000028000888 c00000000fa82100 c00000000000d3b8 
0000000000000000 
- [    1.889742] GPR16: 0000000000000000 0000000000000000 0000000000000000 
0000000000000000 
- [    1.889742] GPR20: 0000000000000000 0000000000000000 0000000000000000 
a78e54a22eb64f8c 
- [    1.889742] GPR24: c000003fd754c800 678e549df9e2878c 0000000000000300 
c0000000002bd05c 
- [    1.889742] GPR28: c000003fed01ea00 00000000014080c0 c000003fd754c800 
c000003fed01ea00 
+ [    1.889742] CFAR: c000000000016e1c SOFTE: 1
+ [    1.889742] GPR00: c00000000038a914 c000003fed193ac0 c0000000016eae00 
0000000000000001
+ [    1.889742] GPR04: c000003fd754c7f8 000000000000002c 0000000000000001 
000000000000002b
+ [    1.889742] GPR08: 678e549df9e28874 0000000000000000 0000000000000000 
fffffffffffffffe
+ [    1.889742] GPR12: 0000000028000888 c00000000fa82100 c00000000000d3b8 
0000000000000000
+ [    1.889742] GPR16: 0000000000000000 0000000000000000 0000000000000000 
0000000000000000
+ [    1.889742] GPR20: 0000000000000000 0000000000000000 0000000000000000 
a78e54a22eb64f8c
+ [    1.889742] GPR24: c000003fd754c800 678e549df9e2878c 0000000000000300 
c0000000002bd05c
+ [    1.889742] GPR28: c000003fed01ea00 00000000014080c0 c000003fd754c800 
c000003fed01ea00
  [    1.890286] NIP [c00000000038aa30] kmem_cache_alloc_trace+0x2d0/0x330
  [    1.890340] LR [c00000000038aa1c] kmem_cache_alloc_trace+0x2bc/0x330
  [    1.890391] Call Trace:
  [    1.890416] [c000003fed193ac0] [c00000000038a914] 
kmem_cache_alloc_trace+0x1b4/0x330 (unreliable)
  [    1.890491] [c000003fed193b30] [c0000000002bd05c] pmu_dev_alloc+0x3c/0x170
  [    1.890547] [c000003fed193bb0] [c0000000010e3210] 
perf_event_sysfs_init+0x8c/0xf0
  [    1.890611] [c000003fed193c40] [c00000000000d144] 
do_one_initcall+0x64/0x1d0
  [    1.890676] [c000003fed193d00] [c0000000010b4400] 
kernel_init_freeable+0x280/0x374
  [    1.890740] [c000003fed193dc0] [c00000000000d3d4] kernel_init+0x24/0x160
  [    1.890795] [c000003fed193e30] [c00000000000b528] 
ret_from_kernel_thread+0x5c/0xb4
  [    1.890857] Instruction dump:
- [    1.890909] 7c97ba78 fb210038 38a50001 7f19ba78 fb290000 f8aa0000 4bc8c3f1 
60000000 
- [    1.890978] 7fb8b840 419e0028 e93f0022 e91f0140 <7d59482a> 7d394a14 
7d4a4278 7fa95040 
+ [    1.890909] 7c97ba78 fb210038 38a50001 7f19ba78 fb290000 f8aa0000 4bc8c3f1 
60000000
+ [    1.890978] 7fb8b840 419e0028 e93f0022 e91f0140 <7d59482a> 7d394a14 
7d4a4278 7fa95040
  [    1.891050] ---[ end trace 41b3fe7a827f3888 ]---
- [    2.900027] 
+ [    2.900027]
  [    3.900175] Kernel panic - not syncing: Attempted to kill init! 
exitcode=0x0000000b
- [    3.900175] 
+ [    3.900175]
  [    4.71868[  175.340944355,5] OPAL: Reboot request...
  2] Rebooting in 10 seconds..
  
  This fix is needed to resolve the crash
  
  https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-May/172835.html

-- 
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1770849

Title:
  Ubuntu 18.04 kernel crashed while in degraded mode

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1770849/+subscriptions

-- 
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs

Reply via email to