I found a workaround for this bug: I had script to configure some power
saving options and this script hat the following line:
echo min_power >
/sys/class/scsi_host/host0/link_power_management_policy
Since I deleted this line the problem does not occur anymore. I had this option
switched on for one year an the bug occurred since Ubuntu 12.10. That leads me
to the conclusion:
The bug must have to do something with power saving of the scsi host and there
must be a change between linux 3.2 and 3.5 that leads to the bug.
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https://bugs.launchpad.net/bugs/1063354
Title:
Sudden Read-Only Filesystems
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