raid10 failing to fail...

[Arthur Jones <ajones@xxxxxxxxxxxx>]

Hi All,  I have a raid10 array md0 which, when I
fail all reads on the first underlying block device
(/dev/sda5), reads from the array hang forever.

This is easy for me to reproduce (blkflsbuf is
a simple C program that does a BLKFLSBUF ioctl):

# mount -t debugfs debugfs /debug
# echo 1 > /debug/fail_make_request/interval
# echo 100 > /debug/fail_make_request/probability
# echo 0 > /debug/fail_make_request/space
# echo N > /debug/fail_make_request/task-filter
# echo -1 > /debug/fail_make_request/times
# echo 2 > /debug/fail_make_request/verbose
# ./blkflsbuf /dev/md0
# ./blkflsbuf /dev/sda5
# echo 1 > /sys/block/sda/sda5/make-it-fail
# dd if=/dev/sda5 of=/dev/null count=1
[fails as expected]
# ./blkflsbuf /dev/sda5
# dd if=/dev/md0 of=/dev/null count=1
[hangs here -- kill -INT, -TERM, -KILL
 have no effect...]

I expected to get the reads coming from the
working mirror and to have the failing disk
marked Faulty.  This is tested w/ today's
git tree, but seems to happen on every kernel
I've tried (2.6.9 RHEL4, 2.6.26).

Any ideas?  Thanks...

Arthur
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