rhythmbox freezes after playing for some time intermitently

Gutsy, rhythmbox 0.11.2-0ubuntu4,

After playing songs in my library eventually rhythmbox will freeze. The system tray icon does not respond on right-click, if the GUI is on a desktop it will not redraw. It freezes on a different song each time.

stdout seems to print this:

sh: jackd: not found

strace says this at the end before the freeze:

mmap2(NULL, 1053, PROT_READ, MAP_SHARED, 21, 0) = 0xb4bd9000
_llseek(21, 1053, [1053], SEEK_SET) = 0
munmap(0xb4bd9000, 1053) = 0
close(21) = 0
open("/dev/snd/controlC0", O_RDONLY) = 21
close(21) = 0
semget(0x56a4d5, 1, IPC_CREAT|0660) = 42663938
semctl(42663938, 0, IPC_64|IPC_STAT, 0xbf8d4118) = 0
semctl(42663938, 0, IPC_64|IPC_SET, 0xbf8d4118) = -1 EPERM (Operation not permitted)
semop(42663938, 0xbf8d41ee, 2

Trying with gdb now, but this can often take hours. I'll attach my full strace.

Ok, it froze again, after killing rhythmbox with ctrl-C bt gdb gives me:

Program received signal SIGINT, Interrupt.
[Switching to Thread -1231059264 (LWP 20635)]
0xffffe410 in __kernel_vsyscall ()
(gdb) bt
#0 0xffffe410 in __kernel_vsyscall ()
#1 0xb6e4b03b in semop () from /lib/tls/i686/cmov/libc.so.6
#2 0xb6abd5a1 in snd_pcm_dmix_open () from /usr/lib/libasound.so.2
#3 0xb6abe287 in _snd_pcm_dmix_open () from /usr/lib/libasound.so.2
#4 0xb6a8c385 in ?? () from /usr/lib/libasound.so.2
#5 0xbf8624f8 in ?? ()
#6 0xb39dd3f0 in ?? ()
#7 0x089f7040 in ?? ()
#8 0xb39d6bc8 in ?? ()
#9 0x00000000 in ?? ()

I'm now on this kernel:

 2.6.22-14-generic #1 SMP

Now downloading the 2.6.22-14.51 image with update-manager.