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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

Ok this seems to be related to a bad backport/forward port of an aufs3
fix.

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https://bugs.launchpad.net/bugs/1503655

Title:
  Kernel bug in eventpoll_release_file+0x46/0xa0 with 3.13.0-66.107

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  With the latest kernel in trusty-proposed I seem to get panics on my
  X230 laptop:

  BUG: unable to handle kernel paging request at fffffffffffffff8
  IP: [<ffffffff81207176>] eventpoll_release_file+0x46/0xa0
  PGD 1c11067 PUD 1c13067 PMD 0 
  Oops: 0000 [#1] SMP 
  Modules linked in: snd_hrtimer ip6table_filter ip6_tables ebtable_nat ebt
  CPU: 1 PID: 1939 Comm: pulseaudio Not tainted 3.13.0-66-generic #107-Ubun
  Hardware name: LENOVO 2324CTO/2324CTO, BIOS G2ET94WW (2.54 ) 04/30/2013
  task: ffff8800c2068000 ti: ffff8800c4826000 task.ti: ffff8800c4826000
  RIP: 0010:[<ffffffff81207176>]  [<ffffffff81207176>] eventpoll_release_fi
  RSP: 0018:ffff8800c4827e78  EFLAGS: 00010286
  RAX: 0000000000000000 RBX: ffffffffffffffb7 RCX: 000000000000000f
  RDX: 0000000001000000 RSI: 0000000000000000 RDI: ffffffff81c72e80
  RBP: ffff8800c4827ea0 R08: 0000000000000000 R09: 0000000000040000
  R10: ffff880210471e61 R11: 0000000000000206 R12: ffffffffffffffa8
  R13: ffff880210471e61 R14: ffff8800c4bc6c00 R15: ffff8800c4acc8f0
  FS:  00007f3dbedd6740(0000) GS:ffff88021e240000(0000) knlGS:0000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: fffffffffffffff8 CR3: 00000000ce1da000 CR4: 00000000001407e0
  Stack:
  ffff8800c4acc840 0000000000000008 ffff880210471e61 ffff8800c4bc6c00
  ffff8800c4afdc00 ffff8800c4827ee8 ffffffff811c00aa 0000000000000000
  ffff8800c2068000 0000000000000000 ffffffff81ebb680 ffff8800c2068620
  Call Trace:
  [<ffffffff811c00aa>] __fput+0x24a/0x260
  [<ffffffff811c010e>] ____fput+0xe/0x10
  [<ffffffff81088557>] task_work_run+0xa7/0xe0
  [<ffffffff81013ed7>] do_notify_resume+0x97/0xb0
  [<ffffffff81734f5a>] int_signal+0x12/0x17
  Code: 00 41 56 41 55 41 54 53 e8 68 37 52 00 49 8b 07 48 8b 08 49 39 c7 4
  RIP  [<ffffffff81207176>] eventpoll_release_file+0x46/0xa0
  RSP <ffff8800c4827e78>
  CR2: fffffffffffffff8
  ---[ end trace f2ee3b43ddaf4bd4 ]---

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