blktrace crashing with 2.6.22-rc3

[Krzysztof Lichota <krzysiek@lichota.net>]

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Hello!
I am trying to use blktrace on latest Ubuntu kernel for Gutsy
(2.6.22-rc3, git tree is at
git://kernel.ubuntu.com/ubuntu/ubuntu-gutsy.git and web frontend at
http://kernel.ubuntu.com/git).

I have compiled it with blktrace enabled and when I try to run
blktrace -k to stop tracing, it doesn't do anything, but in dmesg I can
see the messages:
[  239.499614] DebugFS rmdir on hda failed : directory not empty.
[  239.499637] DebugFS rmdir on block failed : directory not empty.

If I try to kill it afterwards using ^C, it shows message "BLKTRACESTOP:
invalid argument", crashes with segmentation fault (core file is empty)
and I cannot start it again.

This happens if I run blktrace using: blktrace -d /dev/hda -o somefile
(on the same partition which is traced).

If I use network mode, it works fine.

blktrace tools are pulled today using git:
$ cat .git/remotes/origin
URL: git://git.kernel.org/pub/scm/linux/kernel/git/axboe/blktrace.git
Pull: refs/heads/master:refs/heads/origin

Should I investigate it further or is it a known issue?

Regards

	Krzysztof Lichota



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