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[Bug 1298972] Re: stacktrace in ext4: /build/buildd/linux-3.13.0/fs/ext4/ext4_jbd2.c:259 __ext4_handle_dirty_metadata+0x1a2/0x1c0()

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Simon Déziel <1298972@xxxxxxxxxxxxxxxxxx>
Date: Fri, 28 Mar 2014 14:16:16 -0000
Reply-to: Bug 1298972 <1298972@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
apport information

** Tags added: apport-collected

** Description changed:

  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

** Attachment added: "BootDmesg.txt"
   https://bugs.launchpad.net/bugs/1298972/+attachment/4048671/+files/BootDmesg.txt

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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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References

[Bug 1298972] [NEW] stacktrace in ext4: /build/buildd/linux-3.13.0/fs/ext4/ext4_jbd2.c:259 __ext4_handle_dirty_metadata+0x1a2/0x1c0()
From: Simon Déziel, 2014-03-28