We've had a report of the BUG in md_write_start() being triggered while running the Debian installer: <http://bugs.debian.org/696650>. Based on the call trace, I came up with the following script that reproduces this under Linux 3.2.35 and 3.7.3: --- BEGIN --- #!/bin/bash -ex # Set up temporary RAID1 on /dev/md0 dd if=/dev/zero of=/tmp/disk0 bs=1M count=1 losetup /dev/loop0 /tmp/disk0 dd if=/dev/zero of=/tmp/disk1 bs=1M count=1 losetup /dev/loop1 /tmp/disk1 yes | mdadm -C /dev/md0 -l 1 -n 2 /dev/loop{0,1} # Make it read-only while ! mdadm -o /dev/md0; do sleep 1; done # Call fsync() python -c "import os; os.fsync(os.open('/dev/md0', os.O_RDWR))" --- END --- I assume that the sync request should be filtered out at some point before this assertion is made, since there can be nothing to sync. Ben. -- Ben Hutchings Never attribute to conspiracy what can adequately be explained by stupidity.
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