[Bug 601361] [NEW] DVD-RAM media failures

Fri Jul 9 10:41:40 UTC 2010

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I don't know for sure if this is a kernel related bug, or other.

Basically, I am trying to use DVD-RAM discs with ubuntu. I can run
mkudffs just fine and create the media, but after I start writting to
the media, the system starts blocking lots of stuff. An example of a
side effect is:

Jul  3 06:43:12 wks kernel: [ 2640.430057] INFO: task dpkg:2512 blocked for more than 120 seconds.
Jul  3 06:43:12 wks kernel: [ 2640.430061] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jul  3 06:43:12 wks kernel: [ 2640.430063] dpkg          D 0000000000000002     0  2512   1991 0x00000000
Jul  3 06:43:12 wks kernel: [ 2640.430067]  ffff88002f727db8 0000000000000086 0000000000015bc0 0000000000015bc0
Jul  3 06:43:12 wks kernel: [ 2640.430071]  ffff8800674e9ab0 ffff88002f727fd8 0000000000015bc0 ffff8800674e96f0
Jul  3 06:43:12 wks kernel: [ 2640.430074]  0000000000015bc0 ffff88002f727fd8 0000000000015bc0 ffff8800674e9ab0
Jul  3 06:43:12 wks kernel: [ 2640.430077] Call Trace:
Jul  3 06:43:12 wks kernel: [ 2640.430084]  [<ffffffff811663f0>] ? bdi_sched_wait+0x0/0x20
Jul  3 06:43:12 wks kernel: [ 2640.430087]  [<ffffffff811663fe>] bdi_sched_wait+0xe/0x20
Jul  3 06:43:12 wks kernel: [ 2640.430091]  [<ffffffff81541bbf>] __wait_on_bit+0x5f/0x90
Jul  3 06:43:12 wks kernel: [ 2640.430094]  [<ffffffff811663f0>] ? bdi_sched_wait+0x0/0x20
Jul  3 06:43:12 wks kernel: [ 2640.430096]  [<ffffffff81541c68>] out_of_line_wait_on_bit+0x78/0x90
Jul  3 06:43:12 wks kernel: [ 2640.430100]  [<ffffffff81085470>] ? wake_bit_function+0x0/0x40
Jul  3 06:43:12 wks kernel: [ 2640.430102]  [<ffffffff811663b4>] ? bdi_queue_work+0xa4/0xe0
Jul  3 06:43:12 wks kernel: [ 2640.430105]  [<ffffffff8116776f>] bdi_sync_writeback+0x6f/0x80
Jul  3 06:43:12 wks kernel: [ 2640.430107]  [<ffffffff811677a0>] sync_inodes_sb+0x20/0x30
Jul  3 06:43:12 wks kernel: [ 2640.430110]  [<ffffffff8116b272>] __sync_filesystem+0x82/0x90
Jul  3 06:43:12 wks kernel: [ 2640.430112]  [<ffffffff8116b359>] sync_filesystems+0xd9/0x130
Jul  3 06:43:12 wks kernel: [ 2640.430115]  [<ffffffff8116b411>] sys_sync+0x21/0x40
Jul  3 06:43:12 wks kernel: [ 2640.430119]  [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b

Jul  3 07:07:34 wks kernel: [ 4102.723114] UDF-fs INFO UDF: Mounting volume 'LinuxUDF', timestamp 2010/06/28 17:51 (1f10)
Jul  3 07:07:58 wks kernel: [ 4126.593207] udf: udf_read_inode(ino 214403) failed !bh
Jul  3 07:07:58 wks kernel: [ 4126.597893] udf: udf_read_inode(ino 214411) failed !bh
Jul  3 07:07:58 wks kernel: [ 4126.603855] udf: udf_read_inode(ino 214433) failed !bh
....

The last paste above is what happens when I reinsert the DVD-RAM disk into the drive after an unclean eject, so it's somewhat expected.

I have had successful writes to the media though. But what I have
noticed is that if I write some data to the disc, then issue an umount,
it unmounts after only blocking for about 10 seconds, but still
continues to write in the background. But then if I type "sync", it
blocks forever (at least 1hour+, until I eject and give up) while the
drive activity light goes solid and other things stop responding.

Shouldn't the kernel block any umount requests until the data is fully
written to the disc? It seems like a bug that umount succeeds even
though the data is being written in the background.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: mount 2.17.2-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-23.37-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-23-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
CheckboxSubmission: c3db184c2753f743b7cb62d6a698ae29
CheckboxSystem: da9af3b901b5569a389df6337f3d812f
Date: Sat Jul  3 08:57:47 2010
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: util-linux

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug lucid
-- 
DVD-RAM media failures
https://bugs.launchpad.net/bugs/601361
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