el-tio ~ # gdb /usr/local/libexec/dovecot/tcpwrap /var/run/dovecot2/core GNU gdb (GDB) 7.4.1-debian Copyright (C) 2012 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". For bug reporting instructions, please see: ... Reading symbols from /usr/local/libexec/dovecot/tcpwrap...done. [New LWP 29930] warning: Can't read pathname for load map: Input/output error. [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Core was generated by `dovecot/tcpwrap'. Program terminated with signal 11, Segmentation fault. #0 0x00007fd7c345caf4 in master_service_init (name=0x4016b7 "tcpwrap", flags=0, argc=0x7fffc2c0920c, argv=0x7fffc2c09200, getopt_str=0x0) at master-service.c:153 153 service->getopt_str = *getopt_str == '\0' ? (gdb) bt full #0 0x00007fd7c345caf4 in master_service_init (name=0x4016b7 "tcpwrap", flags=0, argc=0x7fffc2c0920c, argv=0x7fffc2c09200, getopt_str=0x0) at master-service.c:153 service = 0x9875b0 value = 0x7fd7c372e310 "UH\211\345AWAVAUATE1\344S1\333H\203\354HH\307E\260" count = 0 __FUNCTION__ = "master_service_init" #1 0x00000000004014d0 in main (argc=1, argv=0x987390) at tcpwrap.c:115 No locals. (gdb)