Four times now I have experienced what I think is exactly the same
problem ("touch: cannot touch `testfile': Read-only file system") except
that it happened while the computer was on rather than after resume.
Three of the four times I was away from my laptop when it happened and
had to kill the screen saver via ctrl-alt-F1. I could then view
everything I had been working on on ctrl-alt-F7, but was unable to save
any documents. The next boot says, "Mount of filesystem failed." but
"fsck -y" seemed to be able to fix everything without loss of data
(other than unsaved open documents). I thought this might be a failing
hard drive but I mirrored my drive to another of the same size and the
fourth time was with the new hard drive.
One thing in common to all four occurrences is that I was synchronizing
files between my laptop and another using Unison
(http://www.cis.upenn.edu/~bcpierce/unison/). However this runs as a
normal user (not root). My suspicion is that this problem occurs more
often (or only?) during periods of heavy disk usage.
I use one huge ext4 volume (mounted as /) with it and swap as LVs on LVM
on top of dm-crypt/LUKS encryption. My system is a MacBook 2,1, 160 GB
HDD (not SDD), kernel 2.6.31-16-generic with standard updates.
--
ext4 journal error, remounted read-only after resume
https://bugs.launchpad.net/bugs/438379
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