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[Russell Smith <1298972@xxxxxxxxxxxxxxxxxx>]

The filesystem details are as follows.  This may be related to an
historic bug in the filesystem that is now causing ongoing corruption as
the file system was created in 2010.

mr-russ@mirror:~$ sudo tune2fs -l /dev/vda1
tune2fs 1.42.9 (4-Feb-2014)
Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          8c150a35-6a37-41c4-9155-a99e5acce610
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags:         signed_directory_hash 
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              1962240
Block count:              7863809
Reserved block count:     392018
Free blocks:              2843701
Free inodes:              1509317
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      1022
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8176
Inode blocks per group:   511
Flex block group size:    16
Filesystem created:       Sat May 22 20:51:25 2010
Last mount time:          Fri Apr  3 09:34:17 2015
Last write time:          Fri Apr  3 09:34:16 2015
Mount count:              1
Maximum mount count:      23
Last checked:             Fri Apr  3 09:33:20 2015
Check interval:           15552000 (6 months)
Next check after:         Wed Sep 30 08:33:20 2015
Lifetime writes:          310 GB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:	          256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      af2303c6-1959-47cd-9fbf-3478192a400a
Journal backup:           inode blocks

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https://bugs.launchpad.net/bugs/1298972

Title:
  stacktrace in ext4: /build/buildd/linux-3.13.0/fs/ext4/ext4_jbd2.c:259
  __ext4_handle_dirty_metadata+0x1a2/0x1c0()

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I was running an "apt-get dist-upgrade" when the FS suddenly remounted
  to RO. The 2 audit lines are from apt-dater running successively "apt-
  get update" and "apt-get dist-upgrade":

  [153439.007924] type=1006 audit(1396010484.706:46): pid=16029 uid=0 old auid=4294967295 new auid=104 old ses=4294967295 new ses=9 res=1
  [153502.372488] type=1006 audit(1396010548.070:47): pid=16086 uid=0 old auid=4294967295 new auid=104 old ses=4294967295 new ses=10 res=1
  [153523.874714] EXT4-fs error (device vda1): ext4_mb_generate_buddy:756: group 1, 6475 clusters in bitmap, 6473 in gd; block bitmap corrupt.
  [153523.876361] Aborting journal on device vda1-8.
  [153523.889719] EXT4-fs error (device vda1): ext4_journal_check_start:56: Detected aborted journal
  [153523.890881] EXT4-fs (vda1): Remounting filesystem read-only
  [153523.891574] EXT4-fs (vda1): Remounting filesystem read-only
  [153523.892301] ------------[ cut here ]------------
  [153523.892341] WARNING: CPU: 0 PID: 16129 at /build/buildd/linux-3.13.0/fs/ext4/ext4_jbd2.c:259 __ext4_handle_dirty_metadata+0x1a2/0x1c0()
  [153523.892342] Modules linked in: nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_filter ip_tables x_tables psmouse serio_raw floppy
  [153523.892400] CPU: 0 PID: 16129 Comm: dpkg Not tainted 3.13.0-19-generic #40-Ubuntu
  [153523.892401] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
  [153523.892406]  0000000000000009 ffff880000a97ad0 ffffffff81711075 0000000000000000
  [153523.892408]  ffff880000a97b08 ffffffff810662cd ffff88000aca3d00 0000000000000000
  [153523.892410]  ffff88000a653000 ffffffff81835280 00000000000012ea ffff880000a97b18
  [153523.892412] Call Trace:
  [153523.892444]  [<ffffffff81711075>] dump_stack+0x45/0x56
  [153523.892461]  [<ffffffff810662cd>] warn_slowpath_common+0x7d/0xa0
  [153523.892463]  [<ffffffff810663aa>] warn_slowpath_null+0x1a/0x20
  [153523.892466]  [<ffffffff81268112>] __ext4_handle_dirty_metadata+0x1a2/0x1c0
  [153523.892483]  [<ffffffff81240eca>] ? ext4_dirty_inode+0x2a/0x60
  [153523.892486]  [<ffffffff812707d6>] ext4_free_blocks+0x646/0xbf0
  [153523.892488]  [<ffffffff81261ec5>] ext4_ext_rm_leaf+0x4a5/0x860
  [153523.892490]  [<ffffffff81260f87>] ? __ext4_ext_check+0x197/0x330
  [153523.892492]  [<ffffffff812645e0>] ? ext4_ext_remove_space+0xc0/0x7e0
  [153523.892494]  [<ffffffff8126483c>] ext4_ext_remove_space+0x31c/0x7e0
  [153523.892496]  [<ffffffff81266bb0>] ext4_ext_truncate+0xb0/0xe0
  [153523.892498]  [<ffffffff8123f339>] ext4_truncate+0x379/0x3c0
  [153523.892500]  [<ffffffff8123fef1>] ext4_evict_inode+0x491/0x4f0
  [153523.892514]  [<ffffffff811d3ac0>] evict+0xb0/0x1b0
  [153523.892516]  [<ffffffff811d42d5>] iput+0xf5/0x180
  [153523.892525]  [<ffffffff811c8cfe>] do_unlinkat+0x18e/0x2b0
  [153523.892537]  [<ffffffff81020d25>] ? syscall_trace_enter+0x145/0x250
  [153523.892539]  [<ffffffff811c9c56>] SyS_unlink+0x16/0x20
  [153523.892545]  [<ffffffff81721c7f>] tracesys+0xe1/0xe6
  [153523.892547] ---[ end trace 9b25f1487620e754 ]---
  [153523.892582] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
  [153523.893579] IP: [<ffffffff81256fa1>] __ext4_error_inode+0x31/0x160
  [153523.894350] PGD a06c067 PUD 819d067 PMD 0 
  [153523.894933] Oops: 0000 [#1] SMP 
  [153523.895397] Modules linked in: nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_filter ip_tables x_tables psmouse serio_raw floppy
  [153523.896276] CPU: 0 PID: 16129 Comm: dpkg Tainted: G        W    3.13.0-19-generic #40-Ubuntu
  [153523.896276] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
  [153523.896276] task: ffff880009455fc0 ti: ffff880000a96000 task.ti: ffff880000a96000
  [153523.896276] RIP: 0010:[<ffffffff81256fa1>]  [<ffffffff81256fa1>] __ext4_error_inode+0x31/0x160
  [153523.896276] RSP: 0018:ffff880000a97a88  EFLAGS: 00010296
  [153523.896276] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000082
  [153523.896276] RDX: 00000000000012ea RSI: ffffffff81a6a3e9 RDI: 0000000000000000
  [153523.896276] RBP: ffff880000a97b18 R08: ffffffff81a74110 R09: 0000000000000005
  [153523.896276] R10: 00000000ffffffe2 R11: ffff880000a977fe R12: 0000000000000082
  [153523.896276] R13: ffffffff81835280 R14: 00000000000012ea R15: ffffffff81a74110
  [153523.896276] FS:  00007ff43c02b840(0000) GS:ffff88000b800000(0000) knlGS:0000000000000000
  [153523.896276] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  [153523.896276] CR2: 0000000000000028 CR3: 0000000008df7000 CR4: 00000000000006f0
  [153523.896276] Stack:
  [153523.896276]  ffff880000a97a90 0000000000000103 9b25f1487620e754 0000000000002e42
  [153523.896276]  000000000000103e 0000000000000092 00000000000001fd ffff88000a653000
  [153523.896276]  ffff880000a97b18 ffffffff81267c22 ffffffff810662df ffff88000aca3d00
  [153523.896276] Call Trace:
  [153523.896276]  [<ffffffff81267c22>] ? ext4_journal_abort_handle+0x42/0xc0
  [153523.896276]  [<ffffffff810662df>] ? warn_slowpath_common+0x8f/0xa0
  [153523.896276]  [<ffffffff8126807f>] __ext4_handle_dirty_metadata+0x10f/0x1c0
  [153523.896276]  [<ffffffff812707d6>] ext4_free_blocks+0x646/0xbf0
  [153523.896276]  [<ffffffff81261ec5>] ext4_ext_rm_leaf+0x4a5/0x860
  [153523.896276]  [<ffffffff81260f87>] ? __ext4_ext_check+0x197/0x330
  [153523.896276]  [<ffffffff812645e0>] ? ext4_ext_remove_space+0xc0/0x7e0
  [153523.896276]  [<ffffffff8126483c>] ext4_ext_remove_space+0x31c/0x7e0
  [153523.896276]  [<ffffffff81266bb0>] ext4_ext_truncate+0xb0/0xe0
  [153523.896276]  [<ffffffff8123f339>] ext4_truncate+0x379/0x3c0
  [153523.896276]  [<ffffffff8123fef1>] ext4_evict_inode+0x491/0x4f0
  [153523.896276]  [<ffffffff811d3ac0>] evict+0xb0/0x1b0
  [153523.896276]  [<ffffffff811d42d5>] iput+0xf5/0x180
  [153523.896276]  [<ffffffff811c8cfe>] do_unlinkat+0x18e/0x2b0
  [153523.896276]  [<ffffffff81020d25>] ? syscall_trace_enter+0x145/0x250
  [153523.896276]  [<ffffffff811c9c56>] SyS_unlink+0x16/0x20
  [153523.896276]  [<ffffffff81721c7f>] tracesys+0xe1/0xe6
  [153523.896276] Code: 48 89 e5 41 57 4d 89 c7 41 56 41 89 d6 41 55 49 89 f5 48 c7 c6 e9 a3 a6 81 41 54 49 89 cc 53 48 89 fb 48 83 ec 68 4c 89 4c 24 60 <48> 8b 47 28 48 8b 57 40 48 8b 80 f8 02 00 00 48 8b 40 68 89 90 
  [153523.896276] RIP  [<ffffffff81256fa1>] __ext4_error_inode+0x31/0x160
  [153523.896276]  RSP <ffff880000a97a88>
  [153523.896276] CR2: 0000000000000028
  [153523.933140] ---[ end trace 9b25f1487620e755 ]---

  
  $ apt-cache policy linux-image-virtual linux-image-3.13.0-19-generic
  linux-image-virtual:
    Installed: 3.13.0.19.23
    Candidate: 3.13.0.19.23
    Version table:
   *** 3.13.0.19.23 0
          500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status
  linux-image-3.13.0-19-generic:
    Installed: 3.13.0-19.40
    Candidate: 3.13.0-19.40
    Version table:
   *** 3.13.0-19.40 0
          500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status
  --- 
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Mar 28 04:55 seq
   crw-rw---- 1 root audio 116, 33 Mar 28 04:55 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: [Errno 2] No such file or directory
  CRDA: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 14.04
  IwConfig: Error: [Errno 2] No such file or directory
  Lspci: Error: [Errno 2] No such file or directory
  Lsusb: Error: [Errno 2] No such file or directory
  MachineType: Bochs Bochs
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: root=UUID=65dff546-44c1-4418-9703-57fc37ea3296 ro console=tty0 console=ttyS0,38400 quiet
  ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-19-generic N/A
   linux-backports-modules-3.13.0-19-generic  N/A
   linux-firmware                             N/A
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  trusty
  Uname: Linux 3.13.0-19-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 01/01/2007
  dmi.bios.vendor: Bochs
  dmi.bios.version: Bochs
  dmi.chassis.type: 1
  dmi.chassis.vendor: Bochs
  dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2007:svnBochs:pnBochs:pvr:cvnBochs:ct1:cvr:
  dmi.product.name: Bochs
  dmi.sys.vendor: Bochs

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