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[Scott Moser <smoser@xxxxxxxxxx>]

Public bug reported:

I'm seeing crashes on power8 bare metal (powerNV).
happens sometimes.


[   66.852889] Workqueue: events .work_for_cpu_fn
[   66.852950] Call Trace:
[   66.852977] [c000000fe6edae60] [c000000000016af0] .show_stack+0x170/0x290 (unreliable)
[   66.853063] [c000000fe6edaf50] [c000000000966fc0] .dump_stack+0x88/0xb4
[   66.853138] [c000000fe6edafd0] [c000000000111680] .rcu_check_callbacks+0x5b0/0x950
[   66.853225] [c000000fe6edb100] [c0000000000ad2f8] .update_process_times+0x58/0xb0
[   66.853311] [c000000fe6edb190] [c00000000011f890] .tick_sched_handle.isra.17+0x40/0xd0
[   66.853397] [c000000fe6edb220] [c00000000011f984] .tick_sched_timer+0x64/0xa0
[   66.853472] [c000000fe6edb2c0] [c0000000000cda50] .__run_hrtimer+0xa0/0x270
[   66.853546] [c000000fe6edb360] [c0000000000ce948] .hrtimer_interrupt+0x148/0x330
[   66.853633] [c000000fe6edb470] [c000000000020a00] .timer_interrupt+0x120/0x2c0
[   66.853718] [c000000fe6edb520] [c0000000000023d8] decrementer_common+0x158/0x180
[   66.853805] --- Exception: 901 at ._raw_spin_lock_irqsave+0xb0/0x110
[   66.853805]     LR = ._raw_spin_lock_irqsave+0xe8/0x110
[   66.853916] [c000000fe6edb810] [c0000000000f0cb4] .finish_wait+0x74/0xb0 (unreliable)
[   66.854008] [c000000fe6edb8a0] [d00000000eeaa4f4] .ipr_probe_ioa+0xd84/0x1370 [ipr]
[   66.854096] [c000000fe6edb9d0] [d00000000eeb25c4] .ipr_probe+0x44/0x4c0 [ipr]
[   66.854171] [c000000fe6edbac0] [c000000000516cfc] .local_pci_probe+0x4c/0xe0
[   66.854245] [c000000fe6edbb40] [c0000000000bae68] .work_for_cpu_fn+0x38/0x60
[   66.854319] [c000000fe6edbbc0] [c0000000000bf628] .process_one_work+0x1a8/0x4d0
[   66.854405] [c000000fe6edbc60] [c0000000000c04fc] .worker_thread+0x38c/0x4a0
[   66.854479] [c000000fe6edbd30] [c0000000000c98a0] .kthread+0x110/0x130
[   66.854553] [c000000fe6edbe30] [c00000000000a460] .ret_from_kernel_thread+0x5c/0x7c
[   72.412653] BUG: soft lockup - CPU#40 stuck for 22s! [kworker/40:0:209]

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Attachment added: "kernel output"
   https://bugs.launchpad.net/bugs/1354459/+attachment/4172877/+files/crash-metal.txt

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https://bugs.launchpad.net/bugs/1354459

Title:
  kernel crash power 8 bare metal

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I'm seeing crashes on power8 bare metal (powerNV).
  happens sometimes.

  
  [   66.852889] Workqueue: events .work_for_cpu_fn
  [   66.852950] Call Trace:
  [   66.852977] [c000000fe6edae60] [c000000000016af0] .show_stack+0x170/0x290 (unreliable)
  [   66.853063] [c000000fe6edaf50] [c000000000966fc0] .dump_stack+0x88/0xb4
  [   66.853138] [c000000fe6edafd0] [c000000000111680] .rcu_check_callbacks+0x5b0/0x950
  [   66.853225] [c000000fe6edb100] [c0000000000ad2f8] .update_process_times+0x58/0xb0
  [   66.853311] [c000000fe6edb190] [c00000000011f890] .tick_sched_handle.isra.17+0x40/0xd0
  [   66.853397] [c000000fe6edb220] [c00000000011f984] .tick_sched_timer+0x64/0xa0
  [   66.853472] [c000000fe6edb2c0] [c0000000000cda50] .__run_hrtimer+0xa0/0x270
  [   66.853546] [c000000fe6edb360] [c0000000000ce948] .hrtimer_interrupt+0x148/0x330
  [   66.853633] [c000000fe6edb470] [c000000000020a00] .timer_interrupt+0x120/0x2c0
  [   66.853718] [c000000fe6edb520] [c0000000000023d8] decrementer_common+0x158/0x180
  [   66.853805] --- Exception: 901 at ._raw_spin_lock_irqsave+0xb0/0x110
  [   66.853805]     LR = ._raw_spin_lock_irqsave+0xe8/0x110
  [   66.853916] [c000000fe6edb810] [c0000000000f0cb4] .finish_wait+0x74/0xb0 (unreliable)
  [   66.854008] [c000000fe6edb8a0] [d00000000eeaa4f4] .ipr_probe_ioa+0xd84/0x1370 [ipr]
  [   66.854096] [c000000fe6edb9d0] [d00000000eeb25c4] .ipr_probe+0x44/0x4c0 [ipr]
  [   66.854171] [c000000fe6edbac0] [c000000000516cfc] .local_pci_probe+0x4c/0xe0
  [   66.854245] [c000000fe6edbb40] [c0000000000bae68] .work_for_cpu_fn+0x38/0x60
  [   66.854319] [c000000fe6edbbc0] [c0000000000bf628] .process_one_work+0x1a8/0x4d0
  [   66.854405] [c000000fe6edbc60] [c0000000000c04fc] .worker_thread+0x38c/0x4a0
  [   66.854479] [c000000fe6edbd30] [c0000000000c98a0] .kthread+0x110/0x130
  [   66.854553] [c000000fe6edbe30] [c00000000000a460] .ret_from_kernel_thread+0x5c/0x7c
  [   72.412653] BUG: soft lockup - CPU#40 stuck for 22s! [kworker/40:0:209]

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