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[Frédéric Bonnard <frediz@xxxxxxxxxxxxxxxxxx>]

I got this also on the latest Ubuntu 14.04 : it's looping over this
indefinetly :

[    0.193973]
[    0.194023] Oops: Exception in kernel mode, sig: 4 [#3]
[    0.194128] SMP NR_CPUS=2048 NUMA PowerNV
[    0.194225] Modules linked in:
[    0.194316] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G      D       3.13.0-48-generic #80-Ubuntu
[    0.194403] task: c0000007f26957c0 ti: c0000007f2728000 task.ti: c0000007f2728000
[    0.194477] NIP: c000000001598930 LR: c00000000001897c CTR: c00000000002abfc
[    0.194551] REGS: c0000007f272b800 TRAP: 0e40   Tainted: G      D        (3.13.0-48-generic)
[    0.194651] MSR: 9000000000081001 <SF,HV,ME,LE>  CR: 22004088  XER: 00000000
[    0.194788] CFAR: c00000000002ace4 SOFTE: 0
GPR00: 0000000000000000 c0000007f272ba80 c000000001650610 0000000022004088
GPR04: 0000000000000001 9000000000001001 9000000000001031 c000000001598930
GPR08: 0000000000000000 9000000000001033 c00000000002abfc 00000000ffff8ae2
GPR12: 0000000022004028 c00000000fe40a80 c0000007f272bf90 0000000000000000
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20: c0000000009a18d0 0000000000000001 c00000000150e367 c00000000150f708
GPR24: c0000007f2728080 c0000000016e4a80 c0000000016e4f0c 0000000000000008
GPR28: c0000007f2728000 0000000000000003 9000000000009033 c000000001708190
[    0.195869] NIP [c000000001598930] power7_enter_nap_mode+0x0/0x18
[    0.196001] LR [c00000000001897c] .arch_cpu_idle+0x6c/0x160
[    0.196092] Call Trace:
[    0.196143] [c0000007f272bd70] [c00000000001897c] .arch_cpu_idle+0x6c/0x160
[    0.196285] [c0000007f272bdf0] [c000000000105c94] .cpu_startup_entry+0x1d4/0x300
[    0.196462] [c0000007f272bec0] [c000000000040084] .start_secondary+0x344/0x380
[    0.196626] [c0000007f272bf90] [c000000000009a6c] .start_secondary_prolog+0x10/0x14
[    0.196787] Instruction dump:
[    0.196859] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
[    0.197109] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX 

See attached the log for more


** Attachment added: "power7_enter_nap_mode.txt"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1425699/+attachment/4364326/+files/power7_enter_nap_mode.txt

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https://bugs.launchpad.net/bugs/1425699

Title:
  kernel panic on IBM Power8 PPC MAAS ephemeral image

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Trusty:
  Confirmed

Bug description:
  The kernel running on the 14.04 ephemeral image for MAAS when
  commissioning an IBM Power8 PPC server causes a periodic kernel panic.

  This happens intermittently and cannot be forcefully reproduced.

  The kernel version on the image is 3.13.0-27.50-generic according to
  the boot process.

  Attached is the boot process log with the kernel panics.

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