Dave Chinner wrote:
> There was a line above this about an assert failure? What was it?
Unfortunately there's are no other messages above this in
/var/log/messages. I checked carefully for any asserts.
> If it tripped the assert I think it did, it looks like the system
> was trying to do write IO into a hole in the file. What workload
> were you running, and what are the details of your machine + storage
It's xfs (nobarrier opts) running from a Linux MD software raid device
(no LVM). It uses raid6 on 11 1TB discs, using a chunk size of 32 kB.
The filesystem is 88% full. The discs are on a 3ware 9650SE controller.
The array has a set of backup "snapshots" with hard links created using
the rsync --link-dest feature. We also used --sparse when doing the
rsyncs. We have snapshots for a set of user directories, one for each day.
The message occured while rsync was writing to the array (creating the
snapshots) and it was being read by rsync or a tar to tar pipe to a
second btrfs array.