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[Scott Moser <smoser@xxxxxxxxxx>]

Public bug reported:

After poking/hacking through bug 1551937, I'm able to get through the MAAS install of my xenial system 'gregory-ppc64'.
It hangs on boot though with the attached console log.

For google, the start of what looks sour is:
[   41.113758] sd 0:2:5:0: alua: port group c29c state A preferred supports TOlUSNA
[   61.000096] INFO: rcu_sched self-detected stall on CPU[   61.000109]        23-...: (2 GPs behind) idle=a8f/2/0 softirq=176/177 fqs=5245
[   61.000109]   (t=5251 jiffies g=-94 c=-95 q=10862)
[   61.000140] Task dump for CPU 23:
[   61.000141] swapper/23      R  running task        0     0      1 0x00000804
[   61.000145] Call Trace:
[   61.000154] [c000000ff081f090] [c0000000000fb740] sched_show_task+0xe0/0x180 (unreliable)
[   61.000159] [c000000ff081f100] [c00000000013e594] rcu_dump_cpu_stacks+0xe4/0x150
[   61.000162] [c000000ff081f150] [c000000000143ca4] rcu_check_callbacks+0x6b4/0x9b0
[   61.000164] [c000000ff081f280] [c00000000014bb08] update_process_times+0x58/0xa0
[   61.000168] [c000000ff081f2b0] [c000000000162bb8] tick_sched_handle.isra.6+0x48/0xe0
[   61.000171] [c000000ff081f2f0] [c000000000162cb4] tick_sched_timer+0x64/0xd0
[   61.000173] [c000000ff081f330] [c00000000014c634] __hrtimer_run_queues+0x134/0x470
[   61.000176] [c000000ff081f3c0] [c00000000014d66c] hrtimer_interrupt+0xec/0x2c0
[   61.000182] [c000000ff081f480] [c00000000001f59c] __timer_interrupt+0x8c/0x290
[   61.000184] [c000000ff081f4d0] [c00000000001f950] timer_interrupt+0xa0/0xe0
[   61.000186] [c000000ff081f500] [c000000000002714] decrementer_common+0x114/0x180
[   61.000189] --- interrupt: 901 at queue_work_on+0xc8/0xf0
[   61.000189]     LR = queue_work_on+0xbc/0xf0
[   61.000193] [c000000ff081f7f0] [c00000000060bd94] cursor_timer_handler+0x44/0x80 (unreliable)
[   61.000195] [c000000ff081f820] [c000000000149d3c] call_timer_fn+0x5c/0x1c0
[   61.000197] [c000000ff081f8b0] [c00000000014a1fc] run_timer_softirq+0x31c/0x3f0
[   61.000200] [c000000ff081f980] [c0000000000be9b8] __do_softirq+0x188/0x3e0
[   61.000203] [c000000ff081fa70] [c0000000000bee88] irq_exit+0xc8/0x100
[   61.000206] [c000000ff081fa90] [c00000000001f954] timer_interrupt+0xa4/0xe0
[   61.000212] [c000000ff081fac0] [c000000000002714] decrementer_common+0x114/0x180

** Affects: linux (Ubuntu)
     Importance: High
         Status: Confirmed

** Affects: linux (Ubuntu Xenial)
     Importance: High
         Status: Confirmed

** Attachment added: "boot log from hvc0"
   https://bugs.launchpad.net/bugs/1552319/+attachment/4586699/+files/boot.log

** Description changed:

  After poking/hacking through bug 1551937, I'm able to get through the MAAS install of my xenial system 'gregory-ppc64'.
  It hangs on boot though with the attached console log.
+ 
+ For google, the start of what looks sour is:
+ [   41.113758] sd 0:2:5:0: alua: port group c29c state A preferred supports TOlUSNA
+ [   61.000096] INFO: rcu_sched self-detected stall on CPU[   61.000109]        23-...: (2 GPs behind) idle=a8f/2/0 softirq=176/177 fqs=5245
+ [   61.000109]   (t=5251 jiffies g=-94 c=-95 q=10862)
+ [   61.000140] Task dump for CPU 23:
+ [   61.000141] swapper/23      R  running task        0     0      1 0x00000804
+ [   61.000145] Call Trace:
+ [   61.000154] [c000000ff081f090] [c0000000000fb740] sched_show_task+0xe0/0x180 (unreliable)
+ [   61.000159] [c000000ff081f100] [c00000000013e594] rcu_dump_cpu_stacks+0xe4/0x150
+ [   61.000162] [c000000ff081f150] [c000000000143ca4] rcu_check_callbacks+0x6b4/0x9b0
+ [   61.000164] [c000000ff081f280] [c00000000014bb08] update_process_times+0x58/0xa0
+ [   61.000168] [c000000ff081f2b0] [c000000000162bb8] tick_sched_handle.isra.6+0x48/0xe0
+ [   61.000171] [c000000ff081f2f0] [c000000000162cb4] tick_sched_timer+0x64/0xd0
+ [   61.000173] [c000000ff081f330] [c00000000014c634] __hrtimer_run_queues+0x134/0x470
+ [   61.000176] [c000000ff081f3c0] [c00000000014d66c] hrtimer_interrupt+0xec/0x2c0
+ [   61.000182] [c000000ff081f480] [c00000000001f59c] __timer_interrupt+0x8c/0x290
+ [   61.000184] [c000000ff081f4d0] [c00000000001f950] timer_interrupt+0xa0/0xe0
+ [   61.000186] [c000000ff081f500] [c000000000002714] decrementer_common+0x114/0x180
+ [   61.000189] --- interrupt: 901 at queue_work_on+0xc8/0xf0
+ [   61.000189]     LR = queue_work_on+0xbc/0xf0
+ [   61.000193] [c000000ff081f7f0] [c00000000060bd94] cursor_timer_handler+0x44/0x80 (unreliable)
+ [   61.000195] [c000000ff081f820] [c000000000149d3c] call_timer_fn+0x5c/0x1c0
+ [   61.000197] [c000000ff081f8b0] [c00000000014a1fc] run_timer_softirq+0x31c/0x3f0
+ [   61.000200] [c000000ff081f980] [c0000000000be9b8] __do_softirq+0x188/0x3e0
+ [   61.000203] [c000000ff081fa70] [c0000000000bee88] irq_exit+0xc8/0x100
+ [   61.000206] [c000000ff081fa90] [c00000000001f954] timer_interrupt+0xa4/0xe0
+ [   61.000212] [c000000ff081fac0] [c000000000002714] decrementer_common+0x114/0x180

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => Confirmed

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1552319

Title:
  boot failure on power8 powerNV

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

Bug description:
  After poking/hacking through bug 1551937, I'm able to get through the MAAS install of my xenial system 'gregory-ppc64'.
  It hangs on boot though with the attached console log.

  For google, the start of what looks sour is:
  [   41.113758] sd 0:2:5:0: alua: port group c29c state A preferred supports TOlUSNA
  [   61.000096] INFO: rcu_sched self-detected stall on CPU[   61.000109]        23-...: (2 GPs behind) idle=a8f/2/0 softirq=176/177 fqs=5245
  [   61.000109]   (t=5251 jiffies g=-94 c=-95 q=10862)
  [   61.000140] Task dump for CPU 23:
  [   61.000141] swapper/23      R  running task        0     0      1 0x00000804
  [   61.000145] Call Trace:
  [   61.000154] [c000000ff081f090] [c0000000000fb740] sched_show_task+0xe0/0x180 (unreliable)
  [   61.000159] [c000000ff081f100] [c00000000013e594] rcu_dump_cpu_stacks+0xe4/0x150
  [   61.000162] [c000000ff081f150] [c000000000143ca4] rcu_check_callbacks+0x6b4/0x9b0
  [   61.000164] [c000000ff081f280] [c00000000014bb08] update_process_times+0x58/0xa0
  [   61.000168] [c000000ff081f2b0] [c000000000162bb8] tick_sched_handle.isra.6+0x48/0xe0
  [   61.000171] [c000000ff081f2f0] [c000000000162cb4] tick_sched_timer+0x64/0xd0
  [   61.000173] [c000000ff081f330] [c00000000014c634] __hrtimer_run_queues+0x134/0x470
  [   61.000176] [c000000ff081f3c0] [c00000000014d66c] hrtimer_interrupt+0xec/0x2c0
  [   61.000182] [c000000ff081f480] [c00000000001f59c] __timer_interrupt+0x8c/0x290
  [   61.000184] [c000000ff081f4d0] [c00000000001f950] timer_interrupt+0xa0/0xe0
  [   61.000186] [c000000ff081f500] [c000000000002714] decrementer_common+0x114/0x180
  [   61.000189] --- interrupt: 901 at queue_work_on+0xc8/0xf0
  [   61.000189]     LR = queue_work_on+0xbc/0xf0
  [   61.000193] [c000000ff081f7f0] [c00000000060bd94] cursor_timer_handler+0x44/0x80 (unreliable)
  [   61.000195] [c000000ff081f820] [c000000000149d3c] call_timer_fn+0x5c/0x1c0
  [   61.000197] [c000000ff081f8b0] [c00000000014a1fc] run_timer_softirq+0x31c/0x3f0
  [   61.000200] [c000000ff081f980] [c0000000000be9b8] __do_softirq+0x188/0x3e0
  [   61.000203] [c000000ff081fa70] [c0000000000bee88] irq_exit+0xc8/0x100
  [   61.000206] [c000000ff081fa90] [c00000000001f954] timer_interrupt+0xa4/0xe0
  [   61.000212] [c000000ff081fac0] [c000000000002714] decrementer_common+0x114/0x180

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