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[Marcelo Cerri <1835322@xxxxxxxxxxxxxxxxxx>]

** Also affects: linux-azure (Ubuntu Disco)
   Importance: Undecided
       Status: New

** Changed in: linux-azure (Ubuntu Disco)
       Status: New => Incomplete

** Changed in: linux-azure (Ubuntu Disco)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1835322

Title:
  [linux-azure] panic in ext4_resize_fs()  found during storage testing

Status in linux-azure package in Ubuntu:
  Fix Released
Status in linux-azure source package in Xenial:
  Fix Released
Status in linux-azure source package in Cosmic:
  Invalid
Status in linux-azure source package in Disco:
  Invalid

Bug description:
  A panic was observed during file system testing.  The trace is the
  following:

  [ 8783.243586] kernel BUG at /build/linux-azure-3iFJ9j/linux-azure-4.18.0/fs/ext4/resize.c:266!
  [ 8783.252751] invalid opcode: 0000 [#1] SMP PTI
  [ 8783.256735] CPU: 7 PID: 39476 Comm: resize2fs Not tainted 4.18.0-1023-azure #24~18.04.1-Ubuntu
  [ 8783.256735] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007  06/02/2017
  [ 8783.256735] RIP: 0010:ext4_resize_fs+0x73b/0xf10
  [ 8783.256735] Code: 50 ff ff ff 41 8b 75 10 4d 8b 65 00 85 f6 0f 94 c0 4d 85 e4 0f 94 c1 09 c8 83 bd 5c ff ff ff 01 7e 48 84 c0 0f 84 43 06 00 00 <0f> 0b 48 c7 c2 68 a7 8d 8f 48 c7 c6 00 fb 88 8f 4c 89 f7 e8 0d f8
  [ 8783.256735] RSP: 0018:ffff984e8dce7cb0 EFLAGS: 00010202
  [ 8783.256735] RAX: 0000000000205c01 RBX: 000000000000001f RCX: 0000000000000000
  [ 8783.256735] RDX: ffff8b1dbe1367d0 RSI: 0000000000000000 RDI: 0000000000000000
  [ 8783.256735] RBP: ffff984e8dce7d88 R08: ffff984e8dce7d4c R09: ffff984e8dce7d54
  [ 8783.256735] R10: 0000000000000120 R11: 0000000000000001 R12: ffff8b1dbe136800
  [ 8783.256735] R13: ffff8b1d74aefe80 R14: ffff8b1dbdeb9000 R15: 0000000000000000
  [ 8783.256735] FS:  00007f213fed30c0(0000) GS:ffff8b1ded7c0000(0000) knlGS:0000000000000000
  [ 8783.256735] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [ 8783.256735] CR2: 0000556aa08ae9b8 CR3: 0000001b8e324005 CR4: 00000000003606e0
  [ 8783.256735] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  [ 8783.256735] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  [ 8783.256735] Call Trace:
  [ 8783.256735]  ? security_capable+0x3c/0x60
  [ 8783.256735]  ext4_ioctl+0xf91/0x14d0
  [ 8783.256735]  ? audit_filter_rules.constprop.14+0x325/0xf90
  [ 8783.256735]  ? audit_filter_rules.constprop.14+0x24b/0xf90
  [ 8783.256735]  do_vfs_ioctl+0xa8/0x630
  [ 8783.256735]  ksys_ioctl+0x75/0x80
  [ 8783.256735]  __x64_sys_ioctl+0x1a/0x20
  [ 8783.256735]  do_syscall_64+0x6a/0x1a0
  [ 8783.256735]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
  [ 8783.256735] RIP: 0033:0x7f213f3825d7
  [ 8783.256735] Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 f7 d8 64 89 01 48
  [ 8783.256735] RSP: 002b:00007ffe8effd688 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
  [ 8783.256735] RAX: ffffffffffffffda RBX: 0000556aa08aa980 RCX: 00007f213f3825d7
  [ 8783.256735] RDX: 00007ffe8effd7d0 RSI: 0000000040086610 RDI: 0000000000000004
  [ 8783.256735] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
  [ 8783.256735] R10: 0000000000000000 R11: 0000000000000246 R12: 0000556aa08ac980
  [ 8783.256735] R13: 00007ffe8effd7d0 R14: 0000556aa08a92d0 R15: 0000000000000000

  
  This issue is resolved by the following upstream commit:
  f96c3ac8dfc2 ("ext4: fix crash during online resizing")

  
  Commit f96c3ac8dfc2 is in mainline as of v5.1-rc1.  This commit was requested in the upstream stable kernels.  However, the Ubuntu kernels are EOL upstream.  Please include this commit in the 16.04 and 18.04 linux-azure kernels.

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