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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Tags added: kernel-da-key

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

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https://bugs.launchpad.net/bugs/1425288

Title:
  kernel NULL pointer dereference during bcache cache_set_flush call

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  14.04 + HWE 3.16 kernel.

  RAID-0 (3 spindles) + bcache on SSD - ext4 filesystem

  I'm unable to access this system - this was taken from the iDRAC
  serial console.

  [    4.559402] md: raid1 personality registered for level 1
  [    4.568578] scsi 4:0:0:0: Direct-Access     ATA      PLEXTOR PX-AG256 1.04 PQ: 0 ANSI: 5
  [    4.576976] sd 4:0:0:0: Attached scsi generic sg3 type 0
  [    4.576987] sd 4:0:0:0: [sdd] 500118192 512-byte logical blocks: (256 GB/238 GiB)
  [    4.577334] md/raid1:md0: active with 3 out of 3 mirrors
  [    4.577335] sd 4:0:0:0: [sdd] Write Protect is off
  [    4.577363] md0: detected capacity change from 0 to 1073676288
  [    4.577504] sd 4:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
  [    4.578855]  sdd: unknown partition table
  [    4.579183]  md0: unknown partition table
  [    4.579384] sd 4:0:0:0: [sdd] Attached SCSI disk
  [    4.599312] random: nonblocking pool is initialized
  [    4.668775] bcache: register_bdev() registered backing device md1
  [    4.695459] bcache: error on eaa3d3fb-19b1-47a1-9184-1ac6e96c8593: unsupported bset version at bucket 3617, block 0, 0 keys, disabling caching
  [    4.708278] bcache: register_cache() registered cache device sdd
  [    4.714340] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
  [    4.722193] IP: [<ffffffffc01fdba2>] journal_write_work+0x22/0x50 [bcache]
  [    4.729083] PGD c198e6067 PUD c19fca067 PMD 0
  [    4.733572] Oops: 0000 [#1] SMP
  [    4.736832] Modules linked in: bcache raid1 raid0 hid_generic e1000e usbhid ahci ptp psmouse hid libahci pata_acpi pps_core
  [    4.748186] CPU: 23 PID: 385 Comm: kworker/23:1 Not tainted 3.16.0-30-generic #40~14.04.1-Ubuntu
  [    4.756956] Hardware name: Supermicro X8DTT-H/X8DTT-H, BIOS 2.1b       10/28/2011
  [    4.764433] Workqueue: events cache_set_flush [bcache]
  [    4.769585] task: ffff880c1af33d20 ti: ffff880c1983c000 task.ti: ffff880c1983c000
  [    4.777056] RIP: 0010:[<ffffffffc01fdba2>]  [<ffffffffc01fdba2>] journal_write_work+0x22/0x50 [bcache]
  [    4.786374] RSP: 0018:ffff880c1983fdc8  EFLAGS: 00010246
  [    4.791678] RAX: 0000000000000000 RBX: ffff880c192acbf8 RCX: 000000007fffffff
  [    4.798801] RDX: 0000000000000000 RSI: 000000007fffffff RDI: ffff880c192acbb0
  [    4.805935] RBP: ffff880c1983fdd8 R08: 0000000000000000 R09: 0000000180220000
  [    4.813068] R10: ffffffff81246186 R11: ffffea0030631e80 R12: ffff880c192acbb0
  [    4.820203] R13: ffff880c192a0ce8 R14: ffff880c192a0de8 R15: ffff880c192a0c50
  [    4.827336] FS:  0000000000000000(0000) GS:ffff880c3fd60000(0000) knlGS:0000000000000000
  [    4.835422] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  [    4.841159] CR2: 0000000000000018 CR3: 0000000c19d5e000 CR4: 00000000000007e0
  [    4.848282] Stack:
  [    4.850311]  ffff880c192acbf8 ffff880c1d9a6098 ffff880c1983fe10 ffffffffc0205088
  [    4.857800]  ffff880c1d99d200 ffff880c3fd72c40 ffff880c192a0ce8 0000000000000000
  [    4.865253]  00000000000005c0 ffff880c1983fe58 ffffffff81089ef2 000000003fd72c40
  [    4.872706] Call Trace:
  [    4.875185]  [<ffffffffc0205088>] cache_set_flush+0x158/0x1c0 [bcache]
  [    4.881707]  [<ffffffff81089ef2>] process_one_work+0x182/0x450
  [    4.887539]  [<ffffffff8108a663>] worker_thread+0x123/0x5a0
  [    4.893111]  [<ffffffff8108a540>] ? rescuer_thread+0x380/0x380
  [    4.898935]  [<ffffffff810912c2>] kthread+0xd2/0xf0
  [    4.903807]  [<ffffffff810911f0>] ? kthread_create_on_node+0x1c0/0x1c0
  [    4.910334]  [<ffffffff8176ac3c>] ret_from_fork+0x7c/0xb0
  [    4.915732]  [<ffffffff810911f0>] ? kthread_create_on_node+0x1c0/0x1c0
  [    4.922249] Code: fe ff ff 66 0f 1f 44 00 00 66 66 66 66 90 55 48 89 e5 41 54 4c 8d 67 b8 53 48 89 fb 4c 89 e7 e8 95 cb 56 c1 48 8b 83 38 01 00 00 <80> 78 18 00 75 10 4c 89 e7 e8 90 ca 56 c1 5b 41 5c 5d c3 0f 1f
  [    4.942252] RIP  [<ffffffffc01fdba2>] journal_write_work+0x22/0x50 [bcache]
  [    4.949264]  RSP <ffff880c1983fdc8>
  [    4.952749] CR2: 0000000000000018
  [    4.956061] ---[ end trace c2f23bd1c3cc953e ]---

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