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[Bug 1592541] [NEW] trusty kernel with virtio-blk oops

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Public bug reported:

The following oops was found in a Trusty Cloud-image when doing storage
operations with software raid, lvm and various filesystems.

[   85.327298] general protection fault: 0000 [#1] SMP 
[   85.327806] Modules linked in: bcache btrfs jfs xfs libcrc32c iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_crypt raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear cirrus syscopyarea sysfillrect sysimgblt psmouse virtio_scsi ttm drm_kms_helper drm pata_acpi floppy
[   85.328008] CPU: 0 PID: 6 Comm: kworker/u2:0 Not tainted 3.16.0-71-generic #92~14.04.1-Ubuntu
[   85.328008] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   85.328008] Workqueue: writeback bdi_writeback_workfn (flush-251:0)
[   85.328008] task: ffff88003c2732f0 ti: ffff88003c2a0000 task.ti: ffff88003c2a0000
[   85.328008] RIP: 0010:[<ffffffff813631ce>]  [<ffffffff813631ce>] __blk_bios_map_sg+0x1be/0x3d0
[   85.328008] RSP: 0018:ffff88003c2a38d8  EFLAGS: 00010206
[   85.328008] RAX: 3355167b09fe31e4 RBX: 0000000000000c00 RCX: 0000000000000000
[   85.328008] RDX: 3355167b09fe31e5 RSI: ffffea0000bd2a00 RDI: 0000000000000000
[   85.328008] RBP: ffff88003c2a3958 R08: ffff880028d86520 R09: 0000000000000080
[   85.328008] R10: 0000000000000000 R11: 000000002ed79000 R12: 0000000000000000
[   85.328008] R13: 0000000000000c00 R14: 0000000000000000 R15: ffff88003c2a3968
[   85.328008] FS:  0000000000000000(0000) GS:ffff88003e200000(0000) knlGS:0000000000000000
[   85.328008] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   85.328008] CR2: 00000000025b5000 CR3: 0000000028d8a000 CR4: 00000000000006f0
[   85.328008] Stack:
[   85.328008]  ffff88002313e958 ffff8800001dc4e0 ffff880037370f80 0100000000000000
[   85.328008]  ffff880028d86520 ffff880000000080 0000000000000000 ffffea0000bd2a00
[   85.328008]  0000000000000c00 ffffea0000bb5e00 0000000000001000 ffff8800001dc340
[   85.328008] Call Trace:
[   85.328008]  [<ffffffff81363415>] blk_rq_map_sg+0x35/0x170
[   85.328008]  [<ffffffff814e4950>] virtio_queue_rq+0xa0/0x240
[   85.328008]  [<ffffffff813671e7>] __blk_mq_run_hw_queue+0x1c7/0x320
[   85.328008]  [<ffffffff81367885>] blk_mq_run_hw_queue+0x65/0x80
[   85.328008]  [<ffffffff813685df>] blk_mq_insert_requests+0xcf/0x150
[   85.328008]  [<ffffffff81369139>] blk_mq_flush_plug_list+0x129/0x140
[   85.328008]  [<ffffffff8135ef11>] blk_flush_plug_list+0xd1/0x220
[   85.328008]  [<ffffffff8135f434>] blk_finish_plug+0x14/0x40
[   85.328008]  [<ffffffff8116ed7d>] generic_writepages+0x4d/0x60
[   85.328008]  [<ffffffff8116ff3e>] do_writepages+0x1e/0x40
[   85.328008]  [<ffffffff811ff660>] __writeback_single_inode+0x40/0x2a0
[   85.328008]  [<ffffffff8120021a>] writeback_sb_inodes+0x26a/0x440
[   85.328008]  [<ffffffff8120048f>] __writeback_inodes_wb+0x9f/0xd0
[   85.328008]  [<ffffffff81200743>] wb_writeback+0x283/0x320
[   85.328008]  [<ffffffff81202ea9>] bdi_writeback_workfn+0x1e9/0x4a0
[   85.328008]  [<ffffffff8108b748>] process_one_work+0x178/0x470
[   85.328008]  [<ffffffff8108bfb1>] worker_thread+0x121/0x570
[   85.328008]  [<ffffffff8108be90>] ? rescuer_thread+0x380/0x380
[   85.328008]  [<ffffffff81092ca2>] kthread+0xd2/0xf0
[   85.328008]  [<ffffffff81092bd0>] ? kthread_create_on_node+0x1c0/0x1c0
[   85.328008]  [<ffffffff81776358>] ret_from_fork+0x58/0x90
[   85.328008]  [<ffffffff81092bd0>] ? kthread_create_on_node+0x1c0/0x1c0
[   85.328008] Code: 3f 44 89 4c 24 28 48 89 4c 24 30 e8 8d 99 03 00 8b 7c 24 44 48 8b 74 24 38 4c 8b 44 24 20 44 8b 4c 24 28 48 8b 4c 24 30 49 89 07 <48> 8b 10 83 e2 03 40 f6 c6 03 0f 85 a0 01 00 00 48 09 f2 89 78 
[   85.328008] RIP  [<ffffffff813631ce>] __blk_bios_map_sg+0x1be/0x3d0
[   85.328008]  RSP <ffff88003c2a38d8>
[   85.355829] ---[ end trace 12bf400b01eb42cf ]---
[   85.356327] BUG: unable to handle kernel paging request at ffffffffffffffd8
[   85.356926] IP: [<ffffffff81093380>] kthread_data+0x10/0x20
[   85.357393] PGD 1c16067 PUD 1c18067 PMD 0 
[   85.357778] Oops: 0000 [#2] SMP 
[   85.358067] Modules linked in: bcache btrfs jfs xfs libcrc32c iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_crypt raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear cirrus syscopyarea sysfillrect sysimgblt psmouse virtio_scsi ttm drm_kms_helper drm pata_acpi floppy
[   85.360215] CPU: 0 PID: 6 Comm: kworker/u2:0 Tainted: G      D       3.16.0-71-generic #92~14.04.1-Ubuntu
[   85.360215] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   85.360215] task: ffff88003c2732f0 ti: ffff88003c2a0000 task.ti: ffff88003c2a0000
[   85.360215] RIP: 0010:[<ffffffff81093380>]  [<ffffffff81093380>] kthread_data+0x10/0x20
[   85.360215] RSP: 0018:ffff88003c2a3690  EFLAGS: 00010002
[   85.360215] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000000f
[   85.360215] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88003c2732f0
[   85.360215] RBP: ffff88003c2a3690 R08: 0000000000000000 R09: 000000018027001c
[   85.360215] R10: ffffffff813621da R11: ffffea0000dcb540 R12: ffff88003e2130c0
[   85.360215] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88003c2732f0
[   85.360215] FS:  0000000000000000(0000) GS:ffff88003e200000(0000) knlGS:0000000000000000
[   85.360215] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   85.360215] CR2: 0000000000000028 CR3: 000000003f360000 CR4: 00000000000006f0
[   85.360215] Stack:
[   85.360215]  ffff88003c2a36a8 ffffffff8108c8d1 ffff88003c273828 ffff88003c2a3708
[   85.360215]  ffffffff8177213e ffff88003c2732f0 ffff88003c2a3fd8 00000000000130c0
[   85.360215]  00000000000130c0 ffff88003c2732f0 ffff88003c273a48 ffff88003c2732e0
[   85.360215] Call Trace:
[   85.360215]  [<ffffffff8108c8d1>] wq_worker_sleeping+0x11/0x90
[   85.360215]  [<ffffffff8177213e>] __schedule+0x57e/0x7c0
[   85.360215]  [<ffffffff817723a9>] schedule+0x29/0x70
[   85.360215]  [<ffffffff81071987>] do_exit+0x6e7/0xa70
[   85.360215]  [<ffffffff81017999>] oops_end+0xa9/0x150
[   85.360215]  [<ffffffff81017d4b>] die+0x4b/0x70
[   85.360215]  [<ffffffff810149c6>] do_general_protection+0x126/0x1b0
[   85.360215]  [<ffffffff817783c8>] general_protection+0x28/0x30
[   85.360215]  [<ffffffff813631ce>] ? __blk_bios_map_sg+0x1be/0x3d0
[   85.360215]  [<ffffffff813631b3>] ? __blk_bios_map_sg+0x1a3/0x3d0
[   85.360215]  [<ffffffff81363415>] blk_rq_map_sg+0x35/0x170
[   85.360215]  [<ffffffff814e4950>] virtio_queue_rq+0xa0/0x240
[   85.360215]  [<ffffffff813671e7>] __blk_mq_run_hw_queue+0x1c7/0x320
[   85.360215]  [<ffffffff81367885>] blk_mq_run_hw_queue+0x65/0x80
[   85.360215]  [<ffffffff813685df>] blk_mq_insert_requests+0xcf/0x150
[   85.360215]  [<ffffffff81369139>] blk_mq_flush_plug_list+0x129/0x140
[   85.360215]  [<ffffffff8135ef11>] blk_flush_plug_list+0xd1/0x220
[   85.360215]  [<ffffffff8135f434>] blk_finish_plug+0x14/0x40
[   85.360215]  [<ffffffff8116ed7d>] generic_writepages+0x4d/0x60
[   85.360215]  [<ffffffff8116ff3e>] do_writepages+0x1e/0x40
[   85.360215]  [<ffffffff811ff660>] __writeback_single_inode+0x40/0x2a0
[   85.360215]  [<ffffffff8120021a>] writeback_sb_inodes+0x26a/0x440
[   85.360215]  [<ffffffff8120048f>] __writeback_inodes_wb+0x9f/0xd0
[   85.360215]  [<ffffffff81200743>] wb_writeback+0x283/0x320
[   85.360215]  [<ffffffff81202ea9>] bdi_writeback_workfn+0x1e9/0x4a0
[   85.360215]  [<ffffffff8108b748>] process_one_work+0x178/0x470
[   85.360215]  [<ffffffff8108bfb1>] worker_thread+0x121/0x570
[   85.360215]  [<ffffffff8108be90>] ? rescuer_thread+0x380/0x380
[   85.360215]  [<ffffffff81092ca2>] kthread+0xd2/0xf0
[   85.360215]  [<ffffffff81092bd0>] ? kthread_create_on_node+0x1c0/0x1c0
[   85.360215]  [<ffffffff81776358>] ret_from_fork+0x58/0x90
[   85.360215]  [<ffffffff81092bd0>] ? kthread_create_on_node+0x1c0/0x1c0
[   85.360215] Code: 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 8b 87 c8 04 00 00 55 48 89 e5 <48> 8b 40 d8 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 
[   85.360215] RIP  [<ffffffff81093380>] kthread_data+0x10/0x20
[   85.360215]  RSP <ffff88003c2a3690>
[   85.360215] CR2: ffffffffffffffd8
[   85.360215] ---[ end trace 12bf400b01eb42d0 ]---
[   85.360215] Fixing recursive fault but reboot is needed!

(The full boot/install log will be attached).

The oops looks similar to the follow issue fixed in newer kernels:

https://bugzilla.novell.com/show_bug.cgi?id=888259

Which resulted in the following patch sent and accepted (From
Canonical!)

https://lkml.org/lkml/2014/10/9/339

Fixed in vivid onward, but still present in trusty, fairly hard to
recreate.

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

** Attachment added: "install log with oops."
   https://bugs.launchpad.net/bugs/1592541/+attachment/4683818/+files/trusty-kvm-virtio-blk-oops.txt

-- 
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https://bugs.launchpad.net/bugs/1592541

Title:
  trusty kernel with virtio-blk oops

Status in linux package in Ubuntu:
  New

Bug description:
  The following oops was found in a Trusty Cloud-image when doing
  storage operations with software raid, lvm and various filesystems.

  [   85.327298] general protection fault: 0000 [#1] SMP 
  [   85.327806] Modules linked in: bcache btrfs jfs xfs libcrc32c iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_crypt raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear cirrus syscopyarea sysfillrect sysimgblt psmouse virtio_scsi ttm drm_kms_helper drm pata_acpi floppy
  [   85.328008] CPU: 0 PID: 6 Comm: kworker/u2:0 Not tainted 3.16.0-71-generic #92~14.04.1-Ubuntu
  [   85.328008] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
  [   85.328008] Workqueue: writeback bdi_writeback_workfn (flush-251:0)
  [   85.328008] task: ffff88003c2732f0 ti: ffff88003c2a0000 task.ti: ffff88003c2a0000
  [   85.328008] RIP: 0010:[<ffffffff813631ce>]  [<ffffffff813631ce>] __blk_bios_map_sg+0x1be/0x3d0
  [   85.328008] RSP: 0018:ffff88003c2a38d8  EFLAGS: 00010206
  [   85.328008] RAX: 3355167b09fe31e4 RBX: 0000000000000c00 RCX: 0000000000000000
  [   85.328008] RDX: 3355167b09fe31e5 RSI: ffffea0000bd2a00 RDI: 0000000000000000
  [   85.328008] RBP: ffff88003c2a3958 R08: ffff880028d86520 R09: 0000000000000080
  [   85.328008] R10: 0000000000000000 R11: 000000002ed79000 R12: 0000000000000000
  [   85.328008] R13: 0000000000000c00 R14: 0000000000000000 R15: ffff88003c2a3968
  [   85.328008] FS:  0000000000000000(0000) GS:ffff88003e200000(0000) knlGS:0000000000000000
  [   85.328008] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  [   85.328008] CR2: 00000000025b5000 CR3: 0000000028d8a000 CR4: 00000000000006f0
  [   85.328008] Stack:
  [   85.328008]  ffff88002313e958 ffff8800001dc4e0 ffff880037370f80 0100000000000000
  [   85.328008]  ffff880028d86520 ffff880000000080 0000000000000000 ffffea0000bd2a00
  [   85.328008]  0000000000000c00 ffffea0000bb5e00 0000000000001000 ffff8800001dc340
  [   85.328008] Call Trace:
  [   85.328008]  [<ffffffff81363415>] blk_rq_map_sg+0x35/0x170
  [   85.328008]  [<ffffffff814e4950>] virtio_queue_rq+0xa0/0x240
  [   85.328008]  [<ffffffff813671e7>] __blk_mq_run_hw_queue+0x1c7/0x320
  [   85.328008]  [<ffffffff81367885>] blk_mq_run_hw_queue+0x65/0x80
  [   85.328008]  [<ffffffff813685df>] blk_mq_insert_requests+0xcf/0x150
  [   85.328008]  [<ffffffff81369139>] blk_mq_flush_plug_list+0x129/0x140
  [   85.328008]  [<ffffffff8135ef11>] blk_flush_plug_list+0xd1/0x220
  [   85.328008]  [<ffffffff8135f434>] blk_finish_plug+0x14/0x40
  [   85.328008]  [<ffffffff8116ed7d>] generic_writepages+0x4d/0x60
  [   85.328008]  [<ffffffff8116ff3e>] do_writepages+0x1e/0x40
  [   85.328008]  [<ffffffff811ff660>] __writeback_single_inode+0x40/0x2a0
  [   85.328008]  [<ffffffff8120021a>] writeback_sb_inodes+0x26a/0x440
  [   85.328008]  [<ffffffff8120048f>] __writeback_inodes_wb+0x9f/0xd0
  [   85.328008]  [<ffffffff81200743>] wb_writeback+0x283/0x320
  [   85.328008]  [<ffffffff81202ea9>] bdi_writeback_workfn+0x1e9/0x4a0
  [   85.328008]  [<ffffffff8108b748>] process_one_work+0x178/0x470
  [   85.328008]  [<ffffffff8108bfb1>] worker_thread+0x121/0x570
  [   85.328008]  [<ffffffff8108be90>] ? rescuer_thread+0x380/0x380
  [   85.328008]  [<ffffffff81092ca2>] kthread+0xd2/0xf0
  [   85.328008]  [<ffffffff81092bd0>] ? kthread_create_on_node+0x1c0/0x1c0
  [   85.328008]  [<ffffffff81776358>] ret_from_fork+0x58/0x90
  [   85.328008]  [<ffffffff81092bd0>] ? kthread_create_on_node+0x1c0/0x1c0
  [   85.328008] Code: 3f 44 89 4c 24 28 48 89 4c 24 30 e8 8d 99 03 00 8b 7c 24 44 48 8b 74 24 38 4c 8b 44 24 20 44 8b 4c 24 28 48 8b 4c 24 30 49 89 07 <48> 8b 10 83 e2 03 40 f6 c6 03 0f 85 a0 01 00 00 48 09 f2 89 78 
  [   85.328008] RIP  [<ffffffff813631ce>] __blk_bios_map_sg+0x1be/0x3d0
  [   85.328008]  RSP <ffff88003c2a38d8>
  [   85.355829] ---[ end trace 12bf400b01eb42cf ]---
  [   85.356327] BUG: unable to handle kernel paging request at ffffffffffffffd8
  [   85.356926] IP: [<ffffffff81093380>] kthread_data+0x10/0x20
  [   85.357393] PGD 1c16067 PUD 1c18067 PMD 0 
  [   85.357778] Oops: 0000 [#2] SMP 
  [   85.358067] Modules linked in: bcache btrfs jfs xfs libcrc32c iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_crypt raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear cirrus syscopyarea sysfillrect sysimgblt psmouse virtio_scsi ttm drm_kms_helper drm pata_acpi floppy
  [   85.360215] CPU: 0 PID: 6 Comm: kworker/u2:0 Tainted: G      D       3.16.0-71-generic #92~14.04.1-Ubuntu
  [   85.360215] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
  [   85.360215] task: ffff88003c2732f0 ti: ffff88003c2a0000 task.ti: ffff88003c2a0000
  [   85.360215] RIP: 0010:[<ffffffff81093380>]  [<ffffffff81093380>] kthread_data+0x10/0x20
  [   85.360215] RSP: 0018:ffff88003c2a3690  EFLAGS: 00010002
  [   85.360215] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000000f
  [   85.360215] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88003c2732f0
  [   85.360215] RBP: ffff88003c2a3690 R08: 0000000000000000 R09: 000000018027001c
  [   85.360215] R10: ffffffff813621da R11: ffffea0000dcb540 R12: ffff88003e2130c0
  [   85.360215] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88003c2732f0
  [   85.360215] FS:  0000000000000000(0000) GS:ffff88003e200000(0000) knlGS:0000000000000000
  [   85.360215] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  [   85.360215] CR2: 0000000000000028 CR3: 000000003f360000 CR4: 00000000000006f0
  [   85.360215] Stack:
  [   85.360215]  ffff88003c2a36a8 ffffffff8108c8d1 ffff88003c273828 ffff88003c2a3708
  [   85.360215]  ffffffff8177213e ffff88003c2732f0 ffff88003c2a3fd8 00000000000130c0
  [   85.360215]  00000000000130c0 ffff88003c2732f0 ffff88003c273a48 ffff88003c2732e0
  [   85.360215] Call Trace:
  [   85.360215]  [<ffffffff8108c8d1>] wq_worker_sleeping+0x11/0x90
  [   85.360215]  [<ffffffff8177213e>] __schedule+0x57e/0x7c0
  [   85.360215]  [<ffffffff817723a9>] schedule+0x29/0x70
  [   85.360215]  [<ffffffff81071987>] do_exit+0x6e7/0xa70
  [   85.360215]  [<ffffffff81017999>] oops_end+0xa9/0x150
  [   85.360215]  [<ffffffff81017d4b>] die+0x4b/0x70
  [   85.360215]  [<ffffffff810149c6>] do_general_protection+0x126/0x1b0
  [   85.360215]  [<ffffffff817783c8>] general_protection+0x28/0x30
  [   85.360215]  [<ffffffff813631ce>] ? __blk_bios_map_sg+0x1be/0x3d0
  [   85.360215]  [<ffffffff813631b3>] ? __blk_bios_map_sg+0x1a3/0x3d0
  [   85.360215]  [<ffffffff81363415>] blk_rq_map_sg+0x35/0x170
  [   85.360215]  [<ffffffff814e4950>] virtio_queue_rq+0xa0/0x240
  [   85.360215]  [<ffffffff813671e7>] __blk_mq_run_hw_queue+0x1c7/0x320
  [   85.360215]  [<ffffffff81367885>] blk_mq_run_hw_queue+0x65/0x80
  [   85.360215]  [<ffffffff813685df>] blk_mq_insert_requests+0xcf/0x150
  [   85.360215]  [<ffffffff81369139>] blk_mq_flush_plug_list+0x129/0x140
  [   85.360215]  [<ffffffff8135ef11>] blk_flush_plug_list+0xd1/0x220
  [   85.360215]  [<ffffffff8135f434>] blk_finish_plug+0x14/0x40
  [   85.360215]  [<ffffffff8116ed7d>] generic_writepages+0x4d/0x60
  [   85.360215]  [<ffffffff8116ff3e>] do_writepages+0x1e/0x40
  [   85.360215]  [<ffffffff811ff660>] __writeback_single_inode+0x40/0x2a0
  [   85.360215]  [<ffffffff8120021a>] writeback_sb_inodes+0x26a/0x440
  [   85.360215]  [<ffffffff8120048f>] __writeback_inodes_wb+0x9f/0xd0
  [   85.360215]  [<ffffffff81200743>] wb_writeback+0x283/0x320
  [   85.360215]  [<ffffffff81202ea9>] bdi_writeback_workfn+0x1e9/0x4a0
  [   85.360215]  [<ffffffff8108b748>] process_one_work+0x178/0x470
  [   85.360215]  [<ffffffff8108bfb1>] worker_thread+0x121/0x570
  [   85.360215]  [<ffffffff8108be90>] ? rescuer_thread+0x380/0x380
  [   85.360215]  [<ffffffff81092ca2>] kthread+0xd2/0xf0
  [   85.360215]  [<ffffffff81092bd0>] ? kthread_create_on_node+0x1c0/0x1c0
  [   85.360215]  [<ffffffff81776358>] ret_from_fork+0x58/0x90
  [   85.360215]  [<ffffffff81092bd0>] ? kthread_create_on_node+0x1c0/0x1c0
  [   85.360215] Code: 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 8b 87 c8 04 00 00 55 48 89 e5 <48> 8b 40 d8 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 
  [   85.360215] RIP  [<ffffffff81093380>] kthread_data+0x10/0x20
  [   85.360215]  RSP <ffff88003c2a3690>
  [   85.360215] CR2: ffffffffffffffd8
  [   85.360215] ---[ end trace 12bf400b01eb42d0 ]---
  [   85.360215] Fixing recursive fault but reboot is needed!

  (The full boot/install log will be attached).

  The oops looks similar to the follow issue fixed in newer kernels:

  https://bugzilla.novell.com/show_bug.cgi?id=888259

  Which resulted in the following patch sent and accepted (From
  Canonical!)

  https://lkml.org/lkml/2014/10/9/339

  Fixed in vivid onward, but still present in trusty, fairly hard to
  recreate.

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Follow ups

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