The syslog-ng daemon dies on Mac OS X when a HUP signal is sent: $ sudo /usr/local/sbin/syslog-ng -d io.c: Preparing fd 4 for reading io.c: Preparing fd 5 for reading syslog-ng version 1.6.2 starting io.c: Preparing fd 7 for writing io.c: Preparing fd 8 for writing SIGHUP received, restarting syslog-ng poll.c:282: failed assertion `pArray != (struct pollfd *) NULL' zsh: abort sudo /usr/local/sbin/syslog-ng -d Software versions involved: syslog-ng 1.6.2 libol 0.3.13 gcc 3.3 20030304 (Apple Computer, Inc. build 1495) Mac OS X 10.3.3 (build 7F44) Running ktrace shows the following: 12661 syslog-ng RET write 149/0x95 12661 syslog-ng CALL select(0x9,0xbffff3a0,0xbffff420,0xbffff4a0,0xbffff520) 12661 syslog-ng RET select -1 errno 4 Interrupted system call 12661 syslog-ng PSIG SIGHUP caught handler=0x2a94 mask=0x0 code=0x0 12661 syslog-ng CALL sigaction(0x1,0xbfffecb0,0xbfffed20) 12661 syslog-ng RET sigaction 0 12661 syslog-ng CALL #184(0xbfffee58,0x1) 12661 syslog-ng RET #184 JUSTRETURN 12661 syslog-ng CALL write(0x2,0xbffff540,0x26) 12661 syslog-ng GIO fd 2 wrote 38 bytes "SIGHUP received, restarting syslog-ng " 12661 syslog-ng RET write 38/0x26 12661 syslog-ng CALL write(0x2,0xbfffeb50,0x40) 12661 syslog-ng GIO fd 2 wrote 64 bytes "poll.c:282: failed assertion `pArray != (struct pollfd *) NULL' " 12661 syslog-ng RET write 64/0x40 12661 syslog-ng CALL sigprocmask(0x3,0xbffff324,0) 12661 syslog-ng RET sigprocmask 0 12661 syslog-ng CALL getpid 12661 syslog-ng RET getpid 12661/0x3175 12661 syslog-ng CALL kill(0x3175,0x6) 12661 syslog-ng RET kill 0 12661 syslog-ng PSIG SIGIOT SIG_DFL