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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1523586

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

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https://bugs.launchpad.net/bugs/1523586

Title:
  [PPA] 4.4 regression: kernel panic on reboot

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  While testing the unstable kernel PPA with linux-image-4.4.0-0-generic
  on ppc64el, autopkgtests often fail with this kernel crash on boot:

  ubuntu@juju-prod-ues-proposed-migration-machine-12:~⟫ nova console-log
  adt-xenial-ppc64el-systemd-20151207-161711

  
  SLOF[0m[?25l **********************************************************************
  [1mQEMU Starting
  [0m Build Date = Oct  9 2015 00:25:21
   FW Version = buildd@ release 20140630
   Press "s" to enter Open Firmware.

  [0m[?25hC0000C0100C0120C0140C0200C0201C0220C0240C0260C0270C02E0C0300C0320C0340C0360C0370C0380C0371C0372C0373C0374C0390C03F0C0400C0480C04C0C04D0C0500Populating /vdevice methods
  Populating /vdevice/vty@30000000
  Populating /vdevice/vty@30001000
  Populating /vdevice/nvram@71000000
  C0580C05A0Populating /pci@800000020000000
   Adapters on 0800000020000000
                       00 0800 (D) : 1af4 1000    virtio [ net ]
                       00 1000 (D) : 106b 003f    serial bus [ usb-ohci ]
                       00 1800 (D) : 1af4 1001    virtio [ block ]
                       00 2000 (D) : 1af4 1002    unknown-legacy-device*
  C0600C0640C0690C06A0C06A8C06B0C06B8C06C0C06E0C0700C0800C0880No NVRAM common partition, re-initializing...
  C0890C08A0C08A8C08B0Scanning USB 
    OHCI: initializing
  C08C0C08D0Using default console: /vdevice/vty@30000000
  C08E0C08E8C08FF     
    Welcome to Open Firmware

    Copyright (c) 2004, 2011 IBM Corporation All rights reserved.
    This program and the accompanying materials are made available
    under the terms of the BSD License available at
    http://www.opensource.org/licenses/bsd-license.php

  
  Trying to load:  from: /pci@800000020000000/scsi@3 ... 
  No DOS disk-label found.
    Successfully loaded
  [?25l[37m[40m[37m[40merror: no suitable video mode found.
  [?25l[37m[40m[2J[m[1;1H[2;22HGNU GRUB  version 2.02~beta2-32ubuntu1

  [37m[40m[4;2H+----------------------------------------------------------------------------+[5;2H|[5;79H|[6;2H|[6;79H|[7;2H|[7;79H|[8;2H|[8;79H|[9;2H|[9;79H|[10;2H|[10;79H|[11;2H|[11;79H|[12;2H|[12;79H|[13;2H|[13;79H|[14;2H|[14;79H|[15;2H|[15;79H|[16;2H|[16;79H|[17;2H+----------------------------------------------------------------------------+[37m[40m[18;2H[19;2H[37m[40m     Use the ^ and v keys to select which entry is highlighted.          
        Press enter to boot the selected OS, `e' to edit the commands       
        before booting or `c' for a command-line.                           [5;80H [30m[47m[5;3H*Ubuntu                                                                     [37m[40m[5;78H[37m[40m[37m[40m[6;3H Advanced options for Ubuntu                                                [37m[40m[6;78H[37m[40m[37m[40m[7;3H                                                                            [37m[40m[7;78H[37m[40m[37m[40m[8;3H                                                                            [37m[40m[8;78H[37m[40m[37m[40m[9;3H                                                                            [37m[40m[9;78H[37m[40m[37m[40m[10;3H                                                                            [37m[40m[10;78H[37m[40m[37m[40m[11;3H                                                                            [37m[40m[11;78H[37m[40m[37m[40m[12;3H                                                                            [37m[40m[12;78H[37m[40m[37m[40m[13;3H                                                                            [37m[40m[13;78H[37m[40m[37m[40m[14;3H                                                                            [37m[40m[14;78H[37m[40m[37m[40m[15;3H                                                                            [37m[40m[15;78H[37m[40m[37m[40m[16;3H                                                                            [37m[40m[16;78H[37m[40m[16;80H [5;78H[22;1H   The highlighted entry will be executed automatically in 10s.                [5;78H[22;1H   The highlighted entry will be executed automatically in 9s.                 [5;78H[22;1H   The highlighted entry will be executed automatically in 8s.                 [5;78H[22;1H   The highlighted entry will be executed automatically in 7s.                 [5;78H[22;1H   The highlighted entry will be executed automatically in 6s.                 [5;78H[22;1H   The highlighted entry will be executed automatically in 5s.                 [5;78H[22;1H   The highlighted entry will be executed automatically in 4s.                 [5;78H[22;1H   The highlighted entry will be executed automatically in 3s.                 [5;78H[22;1H   The highlighted entry will be executed automatically in 2s.                 [5;78H[22;1H   The highlighted entry will be executed automatically in 1s.                 [5;78H[22;1H   The highlighted entry will be executed automatically in 0s.                 [5;78H[?25h[2J[m[1;1H[2J[m[1;1HLoading Linux 4.4.0-0-generic ...
  Loading initial ramdisk ...
  OF stdout device is: /vdevice/vty@30000000
  Preparing to boot Linux version 4.4.0-0-generic (buildd@bos01-ppc64el-028) (gcc version 5.2.1 20151129 (Ubuntu 5.2.1-27ubuntu1) ) #3-Ubuntu SMP Mon Dec 7 10:52:50 UTC 2015 (Ubuntu 4.4.0-0.3-generic 4.4.0-rc4)
  Detected machine type: 0000000000000101
  Max number of cores passed to firmware: 2048 (NR_CPUS = 2048)
  Calling ibm,client-architecture-support... done
  command line: BOOT_IMAGE=/boot/vmlinux-4.4.0-0-generic root=UUID=9f6cb10b-904a-4b22-b9e1-80455f176cc2 ro console=hvc0 earlyprintk init=/lib/systemd/systemd-bootchart
  memory layout at init:
    memory_limit : 0000000000000000 (16 MB aligned)
    alloc_bottom : 0000000005890000
    alloc_top    : 0000000030000000
    alloc_top_hi : 0000000060000000
    rmo_top      : 0000000030000000
    ram_top      : 0000000060000000
  instantiating rtas at 0x000000002fff0000... done
  prom_hold_cpus: skipped
  copying OF device tree...
  Building dt strings...
  Building dt structure...
  Device tree strings 0x00000000058a0000 -> 0x00000000058a0849
  Device tree struct  0x00000000058b0000 -> 0x00000000058c0000
  Quiescing Open Firmware ...
  Booting Linux via __start() ...
  [    0.000000] Using pSeries machine description
  [    0.000000] Page sizes from device-tree:
  [    0.000000] base_shift=12: shift=12, sllp=0x0000, avpnm=0x00000000, tlbiel=1, penc=0
  [    0.000000] base_shift=16: shift=16, sllp=0x0110, avpnm=0x00000000, tlbiel=1, penc=1
  [    0.000000] Using 1TB segments
  [    0.000000] Found initrd at 0xc000000003a00000:0xc000000005884a58
  [    0.000000] bootconsole [udbg0] enabled
  [    0.000000] CPU maps initialized for 1 thread per core
   -> smp_release_cpus()
  spinning_secondaries = 0
   <- smp_release_cpus()
  [    0.000000] Starting Linux ppc64le #3-Ubuntu SMP Mon Dec 7 10:52:50 UTC 2015
  [    0.000000] -----------------------------------------------------
  [    0.000000] ppc64_pft_size    = 0x18
  [    0.000000] phys_mem_size     = 0x60000000
  [    0.000000] cpu_features      = 0x17fc7a6c18500249
  [    0.000000]   possible        = 0x1fffffef18500649
  [    0.000000]   always          = 0x0000000018100040
  [    0.000000] cpu_user_features = 0xdc0065c2 0xef000000
  [    0.000000] mmu_features      = 0x58000001
  [    0.000000] firmware_features = 0x000000014052440b
  [    0.000000] htab_hash_mask    = 0x1ffff
  [    0.000000] -----------------------------------------------------
   <- setup_system()
  0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
  [    1.181166] NIP: c000000000183050 LR: c0000000001838c8 CTR: c000000000183880
  [    1.181216] REGS: c00000005e70b7d0 TRAP: 0300   Tainted: G        W        (4.4.0-0-generic)
  [    1.181274] MSR: 8000000100009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24028404  XER: 20000000
  [    1.181394] CFAR: c000000000009958 DAR: 00000000000000c1 DSISR: 40000000 SOFTE: 1 
  GPR00: c0000000001838c8 c00000005e70ba50 c000000001573100 0000000000000001 
  GPR04: 000000000000000c 0000000000000000 0000000000000000 0000000000000000 
  GPR08: ffffffffffffffff 0000000000000001 ffffffffffffffff 000000000e57a24d 
  GPR12: c000000000183880 c00000000fb40000 c0000000000e4188 0000000004208040 
  GPR16: c000000058574a68 000000000000000a 0000000000000000 c00000005fe1f338 
  GPR20: 0000000000000000 c000000001481780 c000000000b03918 7fffffffffffffff 
  GPR24: 0000000000000001 c00000005e708000 c00000000147c180 c000000053079800 
  GPR28: c00000000152d090 c0000000015b0030 c000000053cf6950 00000000000000c1 
  [    1.182066] NIP [c000000000183050] pids_cancel.constprop.4+0x30/0x90
  [    1.182109] LR [c0000000001838c8] pids_free+0x48/0x80
  [    1.182142] Call Trace:
  [    1.182160] [c00000005e70ba50] [c000000000b03918] cpu_online_mask+0x0/0x8 (unreliable)
  [    1.182220] [c00000005e70ba80] [c0000000001838c8] pids_free+0x48/0x80
  [    1.182271] [c00000005e70bab0] [c000000000181eb0] cgroup_free+0x90/0xe0
  [    1.182322] [c00000005e70bb00] [c0000000000b3998] __put_task_struct+0x68/0x170
  [    1.182381] [c00000005e70bb30] [c0000000000b8b6c] delayed_put_task_struct+0x6c/0xe0
  [    1.182440] [c00000005e70bb70] [c00000000013e3a0] rcu_process_callbacks+0x340/0x6e0
  [    1.182513] [c00000005e70bc10] [c0000000000bcff8] __do_softirq+0x188/0x3a0
  [    1.182563] [c00000005e70bd00] [c0000000000bd254] run_ksoftirqd+0x44/0xb0
  [    1.182614] [c00000005e70bd20] [c0000000000e9af0] smpboot_thread_fn+0x290/0x2a0
  [    1.182673] [c00000005e70bd80] [c0000000000e4290] kthread+0x110/0x130
  [    1.182724] [c00000005e70be30] [c000000000009538] ret_from_kernel_thread+0x5c/0xa4
  [    1.182782] Instruction dump:
  [    1.182808] 3c4c013f 384200e0 7c0802a6 fbe1fff8 f8010010 f821ffd1 7c7f1b78 60000000 
  [    1.182895] 60000000 3bff00c0 3940ffff 7c2004ac <7d20f8a8> 7d2a4a14 7d20f9ad 40c2fff4 
  [    1.182982] ---[ end trace 66241192affcee1c ]---
  [    1.184126] 
  [    3.184191] Kernel panic - not syncing: Fatal exception in interrupt

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