Public bug reported:
using jackd2 on 12.04, the the jackdbus process hangs when trying to
stop jack via qjackctl. unfortunately there is no debug package for
jackd/libjack, so the backtrace is not really helpful:
(gdb) thread apply all bt
Thread 4 (Thread 0x7f6be01b8700 (LWP 17410)):
#0 sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:86
#1 0x00007f6be42b1ce8 in ?? ()
#2 0x00007f6be01b8700 in ?? ()
#3 0x0000000000000000 in ?? ()
Thread 3 (Thread 0x7f6bdf7b6700 (LWP 17411)):
#0 sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:86
#1 0x00007f6be42b1ce8 in ?? ()
#2 0x0000000000000000 in ?? ()
Thread 2 (Thread 0x7f6bdedb4700 (LWP 17412)):
#0 sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:86
#1 0x00007f6be42b1ce8 in ?? ()
#2 0x0000000000000000 in ?? ()
Thread 1 (Thread 0x7f6be63c5740 (LWP 17409)):
#0 0x00007f6be50e5b03 in __GI___poll (fds=<optimized out>, nfds=<optimized
out>, timeout=<optimized out>)
at ../sysdeps/unix/sysv/linux/poll.c:87
#1 0x00007f6be5609de0 in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#2 0x00007f6be5608ccd in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#3 0x00007f6be55f3c05 in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#4 0x00007f6be55f4ca2 in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#5 0x000000000040463c in ?? ()
#6 0x00007f6be502076d in __libc_start_main (main=0x404380, argc=2,
ubp_av=0x7fff0b2ab3e8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fff0b2ab3d8) at libc-start.c:226
#7 0x0000000000404995 in ?? ()
#8 0x00007fff0b2ab3d8 in ?? ()
#9 0x000000000000001c in ?? ()
#10 0x0000000000000002 in ?? ()
#11 0x00007fff0b2acbd0 in ?? ()
#12 0x00007fff0b2acbe2 in ?? ()
#13 0x0000000000000000 in ?? ()
the backtrace via totalview is a bit more helpful:
> 0 __poll PC=0x7f6be50e5b03, FP=0x7fff0b2ab0d0
> [/usr/lib/debug/lib/x86_64-linux-gnu/libc-2.15.so]
1 dbus_threads_init_default PC=0x7f6be5609ddb, FP=0x7fff0b2ab110
[/lib/x86_64-linux-gnu/libdbus-1.so.3]
2 dbus_threads_init_default PC=0x7f6be5608cca, FP=0x7fff0b2ab130
[/lib/x86_64-linux-gnu/libdbus-1.so.3]
3 dbus_connection_open PC=0x7f6be55f3c00, FP=0x7fff0b2ab160
[/lib/x86_64-linux-gnu/libdbus-1.so.3]
4 dbus_connection_dispatch PC=0x7f6be55f4c9d, FP=0x7fff0b2ab180
[/lib/x86_64-linux-gnu/libdbus-1.so.3]
5 Unknown PC=0x00404637, FP=0x7fff0b2ab300 [/usr/bin/jackdbus]
6 __libc_start_main PC=0x7f6be5020769, FP=0x7fff0b2ab3c0
[/usr/lib/debug/lib/x86_64-linux-gnu/libc-2.15.so]
7 Unknown PC=0x00404990, FP=0x7fff0b2ab3d0 [/usr/bin/jackdbus]
** Affects: jackd2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/972347
Title:
jackd2 hangs when stopping
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