Balazs Scheidler, I read your message from: http://lists.balabit.hu/pipermail/syslog-ng/2001-January/001147.html and noticed you required a backtrace to help debug the problem where sending SIGHUP to syslog-ng causes a core dump. We have noticed this problem occurs when you send repeated SIGHUP signals within about a second of each other. This can happen either manually or when newsyslog is run and HUPs syslog-ng while it rotates/gzips the logs. (newsyslog -v) quick example of how to core syslog-ng manually: $ ps aux | grep syslog-ng root 14416 0.2 1.0 928 624 ?? Ss 5:07PM 0:00.06 /usr/local/sbin/syslog-ng -p /var/run/syslog.pid $ kill -HUP 14416 $ kill -HUP 14416 bash: kill: (14416) - No such pid $ cat /var/run/syslog.pid 14416 $ ps aux | grep syslog-ng <nothing, process cored> OS: FreeBSD 3.3-RELEASE syslog-ng: 1.4.10 Thanks, Chris Pile -- See below the gdb output: $ gdb syslog-ng -c syslog-ng.core (gdb) bt #0 0x280aa3d0 in kill () from /usr/lib/libc.so.3 #1 0x280de728 in abort () from /usr/lib/libc.so.3 #2 0x8057727 in fatal (format=0x805d2db "Memory corrupted!\n") at werror.c:187 #3 0x8057fa0 in debug_free (m=0x8061a28) at xalloc.c:95 #4 0x805839d in ol_space_free (p=0x8061a2c) at xalloc.c:315 #5 0x80585ae in do_flush (c=0x8071388, w=0xbfbfdaa8) at pkt_buffer.c:101 #6 0x8055fee in write_callback (fd=0x8071408) at io.c:487 #7 0x8055a43 in io_iter (b=0x8062008) at io.c:253 #8 0x8049a58 in main_loop (backend=0x8062008) at main.c:148 #9 0x8049f8f in main (argc=5, argv=0xbfbfdc04) at main.c:317 #10 0x80496b9 in _start () (gdb) bt full #0 0x280aa3d0 in kill () from /usr/lib/libc.so.3 No symbol table info available. #1 0x280de728 in abort () from /usr/lib/libc.so.3 No symbol table info available. #2 0x8057727 in fatal (format=0x805d2db "Memory corrupted!\n") at werror.c:187 args = 0xbfbfda28 "ΒΌ^\005\b\004" #3 0x8057fa0 in debug_free (m=0x8061a28) at xalloc.c:95 p = (int *) 0x8061a28 real_size = 16 size = 4 #4 0x805839d in ol_space_free (p=0x8061a2c) at xalloc.c:315 m = (int *) 0x8061a28 #5 0x80585ae in do_flush (c=0x8071388, w=0xbfbfdaa8) at pkt_buffer.c:101 self = (struct pkt_buffer *) 0x8071388 res = 87 item_this = (struct ol_queue_node *) 0x8061a2c item_next = (struct ol_queue_node *) 0x80713b4 item = (struct buffer_node *) 0x8061a2c #6 0x8055fee in write_callback (fd=0x8071408) at io.c:487 self = (struct io_fd *) 0x8071408 res = 134577764 w = {super = {super = {next = 0x0, isa = 0x0, alloc_method = 2 '\002', marked = 0 '\000', dead = 0 '\000'}, write = 0x8055ebc <do_write>, writestr = 0}, fd = 0} #7 0x8055a43 in io_iter (b=0x8062008) at io.c:253 fd = (struct nonblocking_fd *) 0x8071408 i = 0 nfds = 2 nco = 3217021744 fds = (struct pollfd *) 0xbfbfdad4 res = 1 timeout = 0 now = 982946899 #8 0x8049a58 in main_loop (backend=0x8062008) at main.c:148 exit_main_loop = 0 #9 0x8049f8f in main (argc=5, argv=0xbfbfdc04) at main.c:317 do_fork = 1 opt = -1 backend = (struct syslog_backend *) 0x8062008 syslog_ng_options = {{name = 0x8058cc0 "cfgfile", has_arg = 1, flag = 0x0, val = 102}, {name = 0x8058cc8 "pidfile", has_arg = 1, flag = 0x0, val = 112}, {name = 0x8058cd0 "debug", has_arg = 0, flag = 0x0, val = 100}, {name = 0x8058cd6 "verbose", has_arg = 0, flag = 0x0, val = 118}, {name = 0x8058cde "help", has_arg = 0, flag = 0x0, val = 104}, {name = 0x8058ce3 "version", has_arg = 0, flag = 0x0, val = 86}, {name = 0x8058ceb "yydebug", has_arg = 0, flag = 0x0, val = 121}, {name = 0x0, has_arg = 0, flag = 0x0, val = 0}} #10 0x80496b9 in _start () No symbol table info available.