XFS hang during xfs_fsr run

[Michael Weissenbacher]

Hi Christoph/Dave!
> Also when you next rebuilt the kernel please make sure to include
> CONFIG_KALLSYMS in the configuration, possibly CONFIG_KALLSYMS_ALL too.
> This will help greatly with decoding any kind of warning / oops.
Thanks for this information. Unfortunately my current kernel was built 
without CONFIG_KALLSYMS. I'm now recompiling with CONFIG_KALLSYMS and 
CONFIG_KALLSYMS_ALL set. I reckon that my old traces can't be 
ksymoops'ed even if i enable that kernel option now? I will see if i can 
get a fresh trace then (even though i hope it won't happen again).

> Was there anything else in the logs prior to the oops messages
> that might indicate errors were occurring?
Unfortunately everything in the logs is dandy until the error happens. 
It seems that xfs_fsr randomly stops at some files and then locks up the 
whole /var partition. I searched for the inode numbers where xfs_fsr 
stopped and one time it was "/var/log/xfs_fsr.log" and the other time it 
was "/var/spool/imap/x/user/xxxx/cyrus.cache" (username obfuscated). 
Whats's interesting is that i have the no-defrag flag set on the whole 
/var/log directory and still it seemed to hang on that log file.

cheers,
Michael