[Jack-Devel] libjack.so and libjackserver.so bug

[Christoph Kuhr]

Hi *,

I observed some strange behavior of libjack and libjackserver.

If I have a multiprocessing application with one jack server fork and 
one jack client fork, jack_client_open crashs.

Here the backtrace:
#0  __strcmp_ssse3 () at ../sysdeps/x86_64/multiarch/../strcmp.S:174
#1  0x00007f83dddb803f in jack_find_driver_descriptor(_JSList*, char 
const*) () from /usr/local/lib/libjackserver.so.0
#2  0x00007f83dddb9ef8 in Jack::JackServerGlobals::Init() () from 
/usr/local/lib/libjackserver.so.0
#3  0x00007f83dddb64f8 in jack_client_open_aux(char const*, JackOptions, 
JackStatus*, __va_list_tag*) () from /usr/local/lib/libjackserver.so.0
#4  0x00007f83dddb67b1 in jack_client_open () from 
/usr/local/lib/libjackserver.so.0
#5  0x0000000000414f04 in talker_Process (arguments=0x63f680 
<arguments>) at ../src/net/avb/talker/talker_process.c:395
#6  0x000000000042d487 in avbruntime (arguments=0x63f680 <arguments>) at 
../src/avbruntime.c:644
#7  0x000000000042e888 in main (argc=11, argv=0x7ffebee6f678) at 
../src/main.c:144


The interesting thing is, jack_client_open keeps crashing if I remove 
all the jack server code.

It was neccessary to remove the -ljackserver linker option as well, 
because the client code linked against libjackserver.so instead of 
libjack.so.

This means it is not possible to have a jack server and a jack client in 
a single multiprocessing application.


BR,
Ck