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Bug#516374: INFO: task * blocked for more than 120 seconds. (ubuntu bug #276476)



Package: linux-source-2.6.26
Version: 2.6.26-13
Severity: important


I am experiencing the same bug as ubuntu # 276476
( https://bugs.launchpad.net/ubuntu/+source/linux/+bug/276476 ),
albeit with an earlier kernel version.

I am submitting this bug report because Google tells me that 2.6.26
is not thought to be affected.

In my instance, I am running 2 etch/lenny user-mode-linux vm's on an
etch/lenny host.  Both kernels are built from the latest version of
lenny's linux-source-2.6.26 package and, AFAIK, there are no
idle-priority or nice+19 processes running on any system involved.
I will, however, attach example output of "ps -Al" on each system.

In both vm's, but not on the host, I am regularly hitting the above
kernel scheduling bug, causing the vm in question to slow to a crawl.
When this happens, both the host and the sibling vm appear to whizz
along with little or no performance loss.

I have saved the backtrace from one such occurence and will attach it
below.

If I can be of any assistance with closing this bug, e.g. by trying
patches, please let me know.

-- System Information:
Debian Release: 4.0
  APT prefers stable
  APT policy: (990, 'stable'), (600, 'testing'), (500, 'oldstable'), (200, 'unstable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.26-oracle-imq-7.0
Locale: LANG=en_NZ.UTF-8, LC_CTYPE=en_NZ.UTF-8 (charmap=UTF-8)

Attachment: orange-sched-bug.gz
Description: Binary data

Attachment: host-ps.gz
Description: Binary data

Attachment: lemon-vm.gz
Description: Binary data

Attachment: orange-vm.gz
Description: Binary data


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