Another bit of information:

I ran strace on both pids, pac_conn that spawns a bash session, and the bash session

 1779 pts/0    Ss     0:00  \_ bash
 2038 pts/0    Sl+    0:03  |   \_ perl asbru-cm
 2227 pts/2    Ssl+   0:00  |       \_ perl /home/test/asbru-cm/lib/pa
+c_conn /home/test/.config/pac/tmp/pac_PID{2038}_n3freeze __PAC_SHELL_
+_
 2234 pts/3    Ss+    0:00  |           \_ /bin/bash -login
 1793 pts/1    Ss     0:00  \_ bash
 2244 pts/1    R+     0:00      \_ ps xaf
[download]

pac_conn propagates the signal to the bash session. Eventually the bash session sends itself a HUP signal, it kills it self and the on the next SIGWINCH pac_conn access a non existent pid and dies with a core dump.

The problem is happening outside the application on the bash shell.

I do not think this is a perl problem, where could be a good place to follow up this, any suggestions?