Comment 2 for bug 1586941

I tried to remove exit(signum) in crash_handler. And I got a core dump (might not be the first time crash).

Here are the backtrace:
#0 0x00007fa5cef53f90 in sigprocmask () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1 0x0000563682722e92 in ?? ()
No symbol table info available.
#2 <signal handler called>
No symbol table info available.
#3 0x00007fa5cfd6dc9c in nih_list_destroy ()
   from /lib/x86_64-linux-gnu/libnih.so.1
No symbol table info available.
#4 0x00007fa5cfd6c3a9 in nih_discard () from /lib/x86_64-linux-gnu/libnih.so.1
No symbol table info available.
#5 0x0000563682731895 in ?? ()
No symbol table info available.
#6 0x0000563682730ccc in ?? ()
No symbol table info available.
#7 0x0000563682731d0a in ?? ()
No symbol table info available.
#8 0x00005636827369bd in ?? ()
No symbol table info available.
#9 0x00007fa5cfd742ba in nih_main_loop ()
   from /lib/x86_64-linux-gnu/libnih.so.1
No symbol table info available.
#10 0x00005636827225f9 in ?? ()
#11 0x00007fa5cef3eec5 in __libc_start_main ()
   from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#12 0x0000563682722712 in ?? ()