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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

** Summary changed:

- system hangs due to blocked filesystem tasks
+ [reiserfs] system hangs due to blocked filesystem tasks

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https://bugs.launchpad.net/bugs/684654

Title:
  [reiserfs] system hangs due to blocked filesystem tasks

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Every few days, a relatively disk-intensive task such as

  find -type d -print0 | xargs -0 chmod u+s # or
  cvs up

  will cause my system to hang.  The filesystem (reiser4 on /home)
  becomes blocked, with more and more processes piling up messages like:

  Dec  2 10:20:22 helium kernel: [192960.871307] INFO: task reiserfs/1:1065 blocked for more than 120 seconds.
  Dec  2 10:20:22 helium kernel: [192960.871316] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Dec  2 10:20:22 helium kernel: [192960.871322] reiserfs/1    D ffff880218496c30     0  1065      2 0x00000000
  Dec  2 10:20:22 helium kernel: [192960.871333]  ffff88022ceffd20 0000000000000046 0000000000000000 0000000000015980
  Dec  2 10:20:22 helium kernel: [192960.871344]  ffff88022cefffd8 0000000000015980 ffff88022cefffd8 ffff88021a7dadc0
  Dec  2 10:20:22 helium kernel: [192960.871354]  0000000000015980 0000000000015980 ffff88022cefffd8 0000000000015980
  Dec  2 10:20:22 helium kernel: [192960.871362] Call Trace:
  Dec  2 10:20:22 helium kernel: [192960.871377]  [<ffffffff81588617>] __mutex_lock_slowpath+0xf7/0x180
  Dec  2 10:20:22 helium kernel: [192960.871387]  [<ffffffff815884fb>] mutex_lock+0x2b/0x50
  Dec  2 10:20:22 helium kernel: [192960.871420]  [<ffffffffa0c84c55>] reiserfs_write_lock+0x35/0x50 [reiserfs]
  Dec  2 10:20:22 helium kernel: [192960.871444]  [<ffffffffa0c7ec49>] flush_async_commits+0x39/0x80 [reiserfs]
  Dec  2 10:20:22 helium kernel: [192960.871466]  [<ffffffffa0c7ec10>] ? flush_async_commits+0x0/0x80 [reiserfs]
  Dec  2 10:20:22 helium kernel: [192960.871477]  [<ffffffff8107a775>] run_workqueue+0xc5/0x1a0
  Dec  2 10:20:22 helium kernel: [192960.871487]  [<ffffffff8107a8f3>] worker_thread+0xa3/0x110
  Dec  2 10:20:22 helium kernel: [192960.871496]  [<ffffffff8107f620>] ? autoremove_wake_function+0x0/0x40
  Dec  2 10:20:22 helium kernel: [192960.871505]  [<ffffffff8107a850>] ? worker_thread+0x0/0x110
  Dec  2 10:20:22 helium kernel: [192960.871512]  [<ffffffff8107f0c6>] kthread+0x96/0xa0
  Dec  2 10:20:22 helium kernel: [192960.871521]  [<ffffffff8100aee4>] kernel_thread_helper+0x4/0x10
  Dec  2 10:20:22 helium kernel: [192960.871529]  [<ffffffff8107f030>] ? kthread+0x0/0xa0
  Dec  2 10:20:22 helium kernel: [192960.871536]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10

  Once this happens the host becomes unresponsive to console input or
  ssh connections, although it does continue to pass network traffic, at
  least for a while.  It eventually has to be force-rebooted.

  This bug is similar to #494476.  The effect of it is pretty severe,
  and I'd greatly appreciate a solution.

  Thanks,
  Andrew.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: linux-image-2.6.35-23-generic 2.6.35-23.41
  Regression: Yes
  Reproducible: No
  ProcVersionSignature: Ubuntu 2.6.35-23.41-generic 2.6.35.7
  Uname: Linux 2.6.35-23-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: CS46xx [Sound Fusion CS46xx], device 0: CS46xx [CS46xx]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'CS46xx'/'Sound Fusion CS46xx at 0xfdaff000/0xfd900000, irq 20'
     Mixer name	: 'Cirrus Logic CS4297A rev 4,Cirrus Logic CS4294 rev 5'
     Components	: 'AC97a:43525914 AC97a:4352592d'
     Controls      : 71
     Simple ctrls  : 45
  Date: Fri Dec  3 05:25:49 2010
  Frequency: Once every few days.
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
  MachineType: Gigabyte Technology Co., Ltd. GA-MA790XT-UD4P
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-23-generic root=UUID=9234eabd-576f-45d0-afee-62424eab19bc ro quiet splash nomodeset video=uvesafb:mode_option=1920x1200-24,mtrr=3,scroll=ywrap
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.38
  RfKill:
   
  SourcePackage: linux
  WifiSyslog:
   Dec  3 03:26:37 helium dhclient: DHCPREQUEST of 192.168.1.2 on eth1 to 192.168.1.1 port 67
   Dec  3 03:26:37 helium dhclient: DHCPACK of 192.168.1.2 from 192.168.1.1
   Dec  3 03:26:37 helium dhclient: bound to 192.168.1.2 -- renewal in 31801 seconds.
   Dec  3 04:57:24 helium kernel: [44737.171753] EXT4-fs (sdb1): re-mounted. Opts: errors=remount-ro,acl,commit=0
   Dec  3 04:57:24 helium kernel: [44737.220796] EXT4-fs (dm-2): re-mounted. Opts: acl,commit=0
  dmi.bios.date: 05/21/2009
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F4
  dmi.board.name: GA-MA790XT-UD4P
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF4:bd05/21/2009:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA790XT-UD4P:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA790XT-UD4P:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-MA790XT-UD4P
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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