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[Dan Prince <dprince@xxxxxxxxxx>]

** No longer affects: nova

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https://bugs.launchpad.net/bugs/1280709

Title:
  intermittent resize2fs failures: kernel BUG at fs/ext4/resize.c:409!

Status in Openstack disk image builder:
  In Progress

Bug description:
  I've been seeing intermittent resize2fs issues w/ DIB images (deployed
  with Nova bare metal) for months now. The issue occurs at first boot
  time once a Nova bare metal instance has booted. Cloud init makes a
  call to resize the file system which fails with the following kernel
  BUG message:

  [  112.136896] EXT4-fs (sda1): resizing filesystem from 1080688 to 5243214 blocs
  [  112.164072] ------------[ cut here ]------------
  [  112.164179] kernel BUG at fs/ext4/resize.c:409!
  [  112.164285] invalid opcode: 0000 [#1] SMP
  [  112.164488] Modules linked in: openvswitch vxlan ip_tunnel gre libcrc32c noui
  [  112.165042] CPU: 0 PID: 968 Comm: resize2fs Tainted: G          I  3.12.9-301
  [  112.165042] Hardware name: Dell Inc. OptiPlex 760                 /0M858N, B9
  [  112.165042] task: ffff8800b7969080 ti: ffff8800b74f4000 task.ti: ffff8800b740
  [  112.165042] RIP: 0010:[<ffffffff81254fa1>]  [<ffffffff81254fa1>] set_flexbg_0
  [  112.165042] RSP: 0018:ffff8800b74f5c28  EFLAGS: 00010216
  [  112.165042] RAX: ffff8800b743bf00 RBX: ffff88007fae9000 RCX: 0000000000001000
  [  112.165042] RDX: ffff88007f4e2c00 RSI: 0000000000000001 RDI: 0000000000000010
  [  112.165042] RBP: ffff8800b74f5c70 R08: ffff8800afd27750 R09: ffff8800b7daee00
  [  112.165042] R10: 0000000000000000 R11: ffff8800afd27750 R12: 0000000000188000
  [  112.165042] R13: 0000000000000010 R14: 0000000000188000 R15: ffff8800b743b800
  [  112.165042] FS:  00007f858a7f4780(0000) GS:ffff8800be800000(0000) knlGS:00000
  [  112.165042] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  [  112.165042] CR2: 00007f8589c1eea6 CR3: 00000000b7979000 CR4: 00000000000407f0
  [  112.165042] Stack:
  [  112.165042]  ffff8800afd27750 ffff8800b96cb060 ffff880000188000 000000108125b
  [  112.165042]  0000000000000010 ffff88007f4e2ed0 00000000000007ff ffff8800b7430
  [  112.165042]  ffff8800b743b800 ffff8800b74f5d68 ffffffff81256768 0000000000180
  [  112.165042] Call Trace:
  [  112.165042]  [<ffffffff81256768>] ext4_flex_group_add+0x1448/0x1830
  [  112.165042]  [<ffffffff81257de2>] ext4_resize_fs+0x7b2/0xe80
  [  112.165042]  [<ffffffff8123ac50>] ext4_ioctl+0xbf0/0xf00
  [  112.165042]  [<ffffffff811c111d>] do_vfs_ioctl+0x2dd/0x4b0
  [  112.165042]  [<ffffffff811b9df2>] ? final_putname+0x22/0x50
  [  112.165042]  [<ffffffff811c1371>] SyS_ioctl+0x81/0xa0
  [  112.165042]  [<ffffffff81676aa9>] system_call_fastpath+0x16/0x1b
  [  112.165042] Code: c8 4c 89 df e8 41 96 f8 ff 44 89 e8 49 01 c4 44 29 6d d4 0
  [  112.165042] RIP  [<ffffffff81254fa1>] set_flexbg_block_bitmap+0x171/0x180
  [  112.165042]  RSP <ffff8800b74f5c28>
  [  112.175633] ---[ end trace f179f994a575df06 ]---

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