Freeze after exception in streaming thread (other outputs never shutdown)

if input is alsa or pulseaudio and output is connected to a local icecast2,
liquidsoap dies in case of shutting down icecast2.

test steps:
start liquidsoap
sudo start icecast2
play icecast stream with player
sudo stop icecast2

configuration:

channel = mksafe(input.alsa())
#channel = mksafe(input.pulseaudio())
#channel = mksafe(input.alsa(device="pcm.liquidsoap"))

radio=channel
radio=limit(radio)
output.icecast(
%vorbis.cbr(samplerate=44100, channels=2, bitrate=160),
host="localhost", port=4565, user="liquidsoap", password="hack", mount="/radio", description="text"
restart=true,
radio
)
output.file(
%mp3(bitrate=160,stereo=true, samplerate=44100),
"/mnt/archive/potsdam/%Y-%m-%d/%Y-%m-%d-%H_%M_%S.mp3",
reopen_when={0m0s},
radio
)

with alsa:

/var/log/icecast2/error.log [2011-05-18 22:04:02] INFO source/source_main listener count on /radio now 0
/var/log/icecast2/error.log [2011-05-18 22:04:19] INFO source/source_main listener count on /radio now 1
/var/log/icecast2/error.log [2011-05-18 22:04:29] INFO sighandler/_sig_die Caught signal 15, shutting down...
/var/log/liquidsoap/play.log 2011/05/18 22:04:30 [/radio:2] Cry socket error: could not write data to host: Broken pipe in write()!
/var/log/liquidsoap/play.log 2011/05/18 22:04:30 [/radio:3] Closing connection...
/var/log/liquidsoap/play.log 2011/05/18 22:04:30 [threads:1] Thread "wallclock_alsa" aborts with exception Cry error: could not close connection: Transport endpoint is not connected in shutdown()!
/var/log/liquidsoap/play.log 2011/05/18 22:04:30 [threads:3] Raised by primitive operation at file "", line 0, characters 0-0
/var/log/liquidsoap/play.log 2011/05/18 22:04:30 [main:3] Shutdown started!
/var/log/liquidsoap/play.log 2011/05/18 22:04:30 [main:3] Waiting for threads to terminate...
/var/log/icecast2/error.log [2011-05-18 22:04:29] INFO source/source_shutdown Source "/radio" exiting
/var/log/icecast2/error.log [2011-05-18 22:04:29] INFO main/main Shutting down
/var/log/icecast2/error.log [2011-05-18 22:04:29] INFO fserve/fserve_shutdown file serving thread stopped
/var/log/icecast2/error.log [2011-05-18 22:04:30] INFO slave/_slave_thread shutting down current relays
/var/log/icecast2/error.log [2011-05-18 22:04:30] INFO slave/_slave_thread Slave thread shutdown complete
/var/log/icecast2/error.log [2011-05-18 22:04:30] INFO auth/auth_shutdown Auth shutdown
/var/log/icecast2/error.log [2011-05-18 22:04:30] INFO yp/yp_shutdown YP thread down
/var/log/icecast2/error.log [2011-05-18 22:04:30] INFO stats/stats_shutdown stats thread finished
/var/log/syslog May 18 22:04:31 wbox-turm init: icecast2 main process (12201) terminated with status 255

and for pulseaudio:

/var/log/icecast2/error.log [2011-05-18 22:11:56] INFO source/source_move_clients passing 0 listeners to "/radio"
/var/log/icecast2/error.log [2011-05-18 22:11:56] INFO format-vorbis/initial_vorbis_page seen initial vorbis header
/var/log/icecast2/error.log [2011-05-18 22:11:57] INFO source/source_main listener count on /radio now 0
/var/log/icecast2/error.log [2011-05-18 22:12:04] INFO source/source_main listener count on /radio now 1
/var/log/liquidsoap/play.log 2011/05/18 22:12:16 [/radio:2] Cry socket error: could not write data to host: Broken pipe in write()!
/var/log/liquidsoap/play.log 2011/05/18 22:12:16 [/radio:3] Closing connection...
/var/log/liquidsoap/play.log 2011/05/18 22:12:16 [threads:1] Thread "wallclock_pulse" aborts with exception Cry error: could not close connection: Transport endpoint is not connected in shutdown()!
/var/log/liquidsoap/play.log 2011/05/18 22:12:16 [threads:3] Raised by primitive operation at file "", line 0, characters 0-0
/var/log/liquidsoap/play.log 2011/05/18 22:12:16 [main:3] Shutdown started!
/var/log/liquidsoap/play.log 2011/05/18 22:12:16 [main:3] Waiting for threads to terminate...
/var/log/liquidsoap/play.log 2011/05/18 22:12:16 [main:3] Cleaning downloaded files...
/var/log/liquidsoap/play.log 2011/05/18 22:12:16 >>> LOG END
/var/log/icecast2/error.log [2011-05-18 22:12:16] INFO sighandler/_sig_die Caught signal 15, shutting down...
/var/log/icecast2/error.log [2011-05-18 22:12:16] INFO source/source_shutdown Source "/radio" exiting
/var/log/icecast2/error.log [2011-05-18 22:12:16] INFO main/main Shutting down
/var/log/icecast2/error.log [2011-05-18 22:12:16] INFO fserve/fserve_shutdown file serving thread stopped

BR, Peter