[Bug 440338] [NEW] reading data from firewire drive stalls, ieee1394 errors appear in messages

[Ethan Tira-Thompson]

Public bug reported:

When playing video from an external ieee1394 drive with mplayer (unsure
if it occurs other times too), the video will stall at an irregular
interval.  After a second or two it will start playing again.

During this time, 'top' reports ~100% CPU utilization waiting for I/O (%wa), and the following lines are dumped in /var/log/messages:
Oct  1 23:13:42 ginger kernel: [260307.000180] ieee1394: sbp2: aborting sbp2 command
Oct  1 23:13:42 ginger kernel: [260307.000213] sd 2:0:0:0: [sdb] CDB: ATA command pass through(16): 85 08 2e 00 00 00 00 00 00 00 00 00 00 40 a1 00
Oct  1 23:13:42 ginger kernel: [260362.000084] ieee1394: sbp2: aborting sbp2 command
Oct  1 23:13:42 ginger kernel: [260362.000103] sd 2:0:0:0: [sdb] CDB: ATA command pass through(16): 85 08 2e 00 00 00 00 00 00 00 00 00 00 40 ec 00
Oct  1 23:13:42 ginger kernel: [260370.000194] ieee1394: sbp2: aborting sbp2 command
Oct  1 23:13:42 ginger kernel: [260370.000221] sd 2:0:0:0: [sdb] CDB: ATA command pass through(16): 85 08 2e 00 00 00 00 00 00 00 00 00 00 40 a1 00

This happens about once every 1-20 minutes, averaging about 4 or 5 minutes (pretty irregular, I don't see a pattern).
Also, going back in the log there is a steady stream of these messages, even when the machine is otherwise idle.  So it is not access via mplayer, that is simply a symptom that makes it obvious (and annoying).

The external drive is a 1TB western digital caviar green WD10EADS living
in a Macally G-S350SUA firewire 400 enclosure.  I presume the ubuntu-bug
has already collected by other system information.

ProblemType: Bug
Architecture: i386
Date: Thu Oct  1 23:14:03 2009
DistroRelease: Ubuntu 9.10
Package: linux-generic 2.6.31.11.22
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-11.36-generic
SourcePackage: linux-meta
Uname: Linux 2.6.31-11-generic i686

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


** Tags: apport-bug i386

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reading data from firewire drive stalls, ieee1394 errors appear in messages
https://bugs.launchpad.net/bugs/440338
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