[Bug 543617] [NEW] very slow filesystem I/O

[Kees Cook]

Public bug reported:

I'm seeing huge latency sometimes when unmounting ext4 partitions.
Steps that triggered this most recently:

sudo -s
cd /tmp
dd if=/dev/zero of=test.ext4 bs=1 count=1 seek=1G
mkfs.ext4 test.ext4
mkdir /mnt/test
mount -o loop text.ext4 /mnt/test
echo $(seq 65536) | (cd /mnt/test; xargs touch)
time umount /mnt/test

I'm seeing upwards of 5 minutes for the umount to finish.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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very slow filesystem I/O
https://bugs.launchpad.net/bugs/543617
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