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[Nuno Sucena Almeida <slug.debian@xxxxxxxxxxxx>]

Hi, I'm running into the same problem almost daily on several SMP
machines (24 cpus) with high load, requiring reboot, using Ubuntu 10.04
LTS. I was initially running with  with stock kernel (2.6.32-28-generic)
but switched to 2.6.35 to see if it would go away, with the same result.

cat /proc/version
Linux version 2.6.35-23-generic (buildd@allspice) (gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) ) #41~lucid1-Ubuntu SMP Thu Dec 2 22:27:43 UTC 2010


cat /proc/mounts 
rootfs / rootfs rw 0 0
none /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
none /proc proc rw,nosuid,nodev,noexec,relatime 0 0
none /dev devtmpfs rw,relatime,size=16466640k,nr_inodes=4116660,mode=755 0 0
none /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /cow tmpfs rw,relatime,mode=755 0 0
/dev/nbd0 /rofs squashfs ro,relatime 0 0
aufs / aufs rw,relatime,si=f440d5a54f83f64d 0 0
tmpfs /cow tmpfs rw,relatime,mode=755 0 0
none /sys/fs/fuse/connections fusectl rw,relatime 0 0
none /sys/kernel/debug debugfs rw,relatime 0 0
none /sys/kernel/security securityfs rw,relatime 0 0
none /dev/shm tmpfs rw,nosuid,nodev,relatime 0 0
none /var/run tmpfs rw,nosuid,relatime,mode=755 0 0
none /var/lock tmpfs rw,nosuid,nodev,noexec,relatime 0 0
none /lib/init/rw tmpfs rw,nosuid,relatime,mode=755 0 0
tmpfs /tmp tmpfs rw,nosuid,nodev,relatime 0 0
server:/opt /opt nfs rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=10.10.0.10,mountvers=3,mountproto=tcp,addr=10.10.0.10 0 0
server:/storage /storage nfs rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=10.10.0.10,mountvers=3,mountproto=tcp,addr=10.10.0.10 0 0
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,nosuid,nodev,noexec,relatime 0 0


See the attachment with the kern.log for one of the machines.

** Attachment added: "kernel log"
   https://bugs.launchpad.net/ubuntu/+source/ltsp/+bug/604314/+attachment/1827299/+files/ldn3-kern.log

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https://bugs.launchpad.net/bugs/604314

Title:
  Kernel deadlock when running programs from aufs over squashfs