[LAU] weird csound + qjacktl problem

[becks]

Hi all,
in my ubuntu 9.04 (vanilla kernel 2.6.29.1 +rt patch), qjackctl (0.34)
window crash (randomly)
after hitting ctrl c in csound (5.08), but jackd (0.116) keep running

this is my csound cmd:
csound -+msg_color=false -+rtaudio=JACK -o dac:system:playback_ -i
adc:system:capture_ -+rtmidi=ALSA -M hw:3,0 -Q hw:3,0  -m135   -B 4096
file.csd

and this my jackd cmd:
/usr/bin/jackd -R -dalsa -dhw:0 -r48000 -p1024 -n3

here the screenshot: http://msound.org/tmp/jack.jpg
qjackctl.log : http://pastebin.com/m23dbb3a
strace qjackctl.bin: http://pastebin.com/m4b7539f7  (output hang after
latest "read")

any suggestion?
thanks

-- 
cb