On an busy lxc server 2.6.38-8-server amd64, I had elevator=cfq in the
cmdline, no dpkg was running, yet it got stuck with the same symptoms
(see the attached screenshot).
It is notable that the error happened across all dm- devices.
I ran the following command, let's see whether that would help:
for tt in /sys/fs/ext4/*/max_writeback_mb_bump; { echo 4 > $tt; }
** Attachment added: "IMG_3476.JPG"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/624877/+attachment/2200348/+files/IMG_3476.JPG
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https://bugs.launchpad.net/bugs/624877
Title:
INFO: task dpkg:23317 blocked for more than 120 seconds.
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