linux-kernel - 2.6.26.3 mount process looping on ext3 rw remount

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Date:	Sat, 23 Aug 2008 10:42:28 +0200
From:	Marc Haber <mh+linux-kernel@...schlus.de>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: 2.6.26.3 mount process looping on ext3 rw remount

Hi,

on my laptop, I am a heavy user of laptop-mode and suspend-to-disk.
Sometimes (maybe once out of ten), when disconnecting or connecting
external power, I have a mount process called by laptopmode busy
looping and taking all available CPU:

  ├─acpid,4680 -c /etc/acpi/events
  │   └─lm_ac_adapter.s,29317 /etc/acpi/actions/lm_ac_adapter.sh
  │       └─laptop_mode,29318 /usr/sbin/laptop_mode auto
  │           └─laptop-mode,29386 /usr/share/laptop-mode-tools/modules/laptop-mode
  │               └─laptop-mode,29390 /usr/share/laptop-mode-tools/modules/laptop-mode
  │                   └─laptop-mode,29409 /usr/share/laptop-mode-tools/modules/laptop-mode
  │                       └─mount,29410 /dev/mapper/usr /mnt/usr -t ext3 -o remount,rw,commit=600

this is what top says
Cpu(s):  2.7%us, 96.0%sy,  0.0%ni,  0.0%id,  0.0%wa,  1.3%hi,  0.0%si, 0.0%st
29410 root      20   0  2068  684  564 R 92.7  0.0  87:37.71 mount

The mount process does not react to SIGKILL, stracing the looping
process doesn't give any output, and the strace gets stuck and does
not react to Ctrl-C. A SIGKILL works for the strace process, though.

To me as a layman this looks like the mount process gets stuck
somewhere in kernel land. I currently have the issue with 2.6.26.3.

In the situation of plugging and/or unplugging the power, the notebook
used to completely freeze in the time when 2.6.24 and 2.6.25.$SMALL
were in use, with 2.6.25.$HIGH and 2.6.26 I haven't hat these freezes
any more. However, I am now plagued with the hanging mount processes.

Any ideas?

Greetings
Marc

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