Comment # 29 on bug 1141762 from Martin Li��ka

Ok, so the client segfaults here:

Thread 1 "jack_simple_cli" received signal SIGSEGV, Segmentation fault.
Jack::JackLinuxFutex::BuildName (this=this@entry=0xfffffffdd03f4218,
client_name=client_name@entry=0x7fffffffd7b0 "jack_simple_client",
server_name=server_name@entry=0x423f10 "default", 
    res=res@entry=0xfffffffdd03f4218 <error: Cannot access memory at address
0xfffffffdd03f4218>, size=256) at ../linux/JackLinuxFutex.cpp:46
46        if (fPromiscuous) {
(gdb) bt
#0  Jack::JackLinuxFutex::BuildName (this=this@entry=0xfffffffdd03f4218,
client_name=client_name@entry=0x7fffffffd7b0 "jack_simple_client",
server_name=server_name@entry=0x423f10 "default", 
    res=res@entry=0xfffffffdd03f4218 <error: Cannot access memory at address
0xfffffffdd03f4218>, size=256) at ../linux/JackLinuxFutex.cpp:46
#1  0x00007ffff7da1475 in Jack::JackLinuxFutex::Connect
(this=0xfffffffdd03f4218, name=name@entry=0x7fffffffd7b0 "jack_simple_client",
server_name=server_name@entry=0x423f10 "default") at
../linux/JackLinuxFutex.cpp:174
#2  0x00007ffff7da8617 in Jack::JackLibClient::Open (this=0x423de0,
server_name=<optimized out>, name=<optimized out>, uuid=<optimized out>,
options=<optimized out>, status=<optimized out>) at
../common/JackLibClient.cpp:196
#3  0x00007ffff7daa5b5 in jack_client_open_aux (ap=0x7fffffffd870,
status=0x7fffffffd97c, options=JackNullOption, client_name=0x7fffffffe202
"jack_simple_client") at ../common/JackLibAPI.cpp:155
#4  jack_client_open (ext_client_name=ext_client_name@entry=0x7fffffffe202
"jack_simple_client", options=options@entry=JackNullOption,
status=status@entry=0x7fffffffd97c) at ../common/JackLibAPI.cpp:176
#5  0x0000000000401224 in main (argc=<optimized out>, argv=<optimized out>) at
../example-clients/simple_client.c:118

which is a string manipulation function. I bet it's related to warnings seen in
the package:
-Wformat-truncation=

I would recommend fixing all these warnings first.