Thanks for that. I have tried to approach so far: * gdb --args ingen -eg I would then run my plugin, remove it, Ingen would crash, but I would get the information as to why Ingen crashed. I'm not even sure that GDB would see that it should debug the vco2.so as well * gdb vco2.so (vco2.so being the name of my plugin) Now I start Ingen, get the PID, and use attach 15674 in gdb (I tried with or without the plugin running). I get the following error message in GDB: (gdb) attach 15764B Attaching to program: /home/blablack/src/avw.lv2/build/avw.lv2/vco2.so, process 15764 Could not attach to process. If your uid matches the uid of the target process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf ptrace: Operation not permitted. I guess GDB is looking for the vco2.so when attaching... So what stupid thing am I doing? Thanks in advance for the help, Aurélien