ext4/305 sleeps 3 minutes and does mount/umount loop in background,
which produces lots of logs in dmesg and 3 minutes is not necessary.
Ted pointed out that 30 mount/umount cycles is enough to crash a buggy
kernel, so just limit the mount/umount loop to reduce the runtime. And
now the runtime is about 2s.
Reported-by: Theodore Ts'o <tytso@mit.edu>
Suggested-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
echo "Start test on device $SCRATCH_DEV, basename $DEV_BASENAME" >$seqres.full
_scratch_mkfs >>$seqres.full 2>&1
-while true;do
- mount $SCRATCH_DEV $SCRATCH_MNT
- umount $SCRATCH_DEV
-done &
-PIDS=$!
-
-while true;do
+while true; do
cat /proc/fs/ext4/$DEV_BASENAME/mb_groups > /dev/null 2>&1
done &
-PIDS="$PIDS $!"
+PIDS=$!
-# sleep for 180s, in most cases a buggy kernel could hit BUG_ON within 3 minutes
-sleep 180
+# 30 loops is enough to crash a buggy kernel
+i=0
+while [ $i -lt 30 ]; do
+ mount $SCRATCH_DEV $SCRATCH_MNT
+ umount $SCRATCH_DEV
+ let i=i+1
+done
# no BUG_ON, all done
kill $PIDS >/dev/null 2>&1