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[dann frazier <dann.frazier@xxxxxxxxxxxxx>]

Upstream thread, for reference: http://www.spinics.net/lists/arm-
kernel/msg489683.html

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https://bugs.launchpad.net/bugs/1566518

Title:
  [arm64] kernel BUG at /build/linux-
  StrpB2/linux-4.4.0/fs/ext4/inode.c:2394!

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  On 2 socket ThunderX systems, a BUG() is triggered by the ext4
  filesystem shortly after boot:

  [  230.637307] Call trace:
  [  230.641753] [<ffff8000002eac90>] mpage_prepare_extent_to_map+0x270/0x290
  [  230.650515] [<ffff8000002eefe0>] ext4_writepages+0x3b0/0xc10
  [  230.658259] [<ffff8000001dcd88>] do_writepages+0x40/0x70
  [  230.665639] [<ffff800000287988>] __writeback_single_inode+0x48/0x3c8
  [  230.674071] [<ffff800000288200>] writeback_sb_inodes+0x220/0x440
  [  230.682161] [<ffff8000002884c4>] __writeback_inodes_wb+0xa4/0xe8
  [  230.690242] [<ffff800000288858>] wb_writeback+0x260/0x338
  [  230.697704] [<ffff800000289300>] wb_workfn+0x348/0x478
  [  230.704879] [<ffff8000000ddc9c>] process_one_work+0x164/0x458
  [  230.712661] [<ffff8000000de0bc>] worker_thread+0x12c/0x4b8
  [  230.720164] [<ffff8000000e4e90>] kthread+0xf8/0x110
  [  230.727030] [<ffff800000085c10>] ret_from_fork+0x10/0x40
  [  230.734301] Code: a94573fb a8cf7bfd d65f03c0 d503201f (d4210000) 
  [  230.742400] ---[ end trace 600acdba70af5dd0 ]---

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