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

[Filipe Coelho]

This is a known scenario.

Those 2 libs share some code, but in a different way.
A client application is never supposed to control the server.

Do not link against the 2 libraries from within the same application, 
and you'll be fine.


On 06.03.2018 09:04, Christoph Kuhr wrote:
> 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
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