Thank you all for the fast answers.
I now attached gdb to slapd and get some results:
(gdb) handle all nostop (gdb) continue Continuing.
Program received signal SIGPIPE, Broken pipe.
Program received signal SIGPIPE, Broken pipe. [New Thread 0xb01f6b70 (LWP 1548)]
Program received signal SIGPIPE, Broken pipe. .. more of the same .. Program received signal SIGPIPE, Broken pipe.
Program received signal SIGPIPE, Broken pipe.
---Type <return> to continue, or q <return> to quit--- Program received signal SIGPIPE, Broken pipe.
Program received signal SIGTERM, Terminated. [New Thread 0xaf4f3b70 (LWP 1968)] [New Thread 0xaf0f2b70 (LWP 1969)] [New Thread 0xaecf1b70 (LWP 1970)] [New Thread 0xae8f0b70 (LWP 1971)] [Thread 0xaf4f3b70 (LWP 1968) exited] [Thread 0xb1bfcb70 (LWP 1474) exited] [Thread 0xb5268b70 (LWP 1462) exited] [Thread 0xaf0f2b70 (LWP 1969) exited] [Thread 0xb4565b70 (LWP 1463) exited] [Thread 0xb01f6b70 (LWP 1548) exited] [Thread 0xb5669b70 (LWP 1461) exited] [Thread 0xb17fbb70 (LWP 1475) exited] [Thread 0xae8f0b70 (LWP 1971) exited] [Thread 0xb28ffb70 (LWP 1464) exited] [Thread 0xaecf1b70 (LWP 1970) exited]
Program exited normally.