If I'm running Nagios 3.0a1 it crashes always after a few seconds. In the log I only found: <table border width=100%> <tr valign=top> <td width=100%><tt>Mar 8 15:35:18 nagios: Nagios 3.0a1 starting... (PID=24492) Mar 8 15:35:18 nagios: LOG VERSION: 2.0 Mar 8 15:35:18 nagios: Finished daemonizing... (New PID=24493) Mar 8 15:35:28 nagios: HOST ALERT: localhost;UP;SOFT;2;PING OK - Packet loss = 0%, RTA = 0.05 ms</tt><a href="http://dict.leo.org/ende?lp=ende&p=/gQPU.&search=always"></a></table> Here the last signs of life captured by strace: <table border width=100%> <tr valign=top> <td width=100%><tt>rename("/usr/local/nagios/var/nagios.tmpNdmpn0", "/usr/local/nagios/var/status.dat") = 0 gettimeofday({1173359616, 173629}, NULL) = 0 time([1173359616]) = 1173359616 gettimeofday({1173359616, 173998}, NULL) = 0 time([1173359616]) = 1173359616 gettimeofday({1173359616, 174363}, NULL) = 0 gettimeofday({1173359616, 174552}, NULL) = 0 time([1173359616]) = 1173359616 gettimeofday({1173359616, 174968}, NULL) = 0 time([1173359616]) = 1173359616 time([1173359616]) = 1173359616 gettimeofday({1173359616, 175746}, NULL) = 0 umask(077) = 02 gettimeofday({1173359616, 176092}, NULL) = 0 getpid() = 3459 open("/tmp/nagiosYBuC2d", O_RDWR|O_CREAT|O_EXCL, 0600) = 7 fcntl64(7, F_GETFL) = 0x2 (flags O_RDWR) fstat64(7, {st_mode=S_IFREG|0600, st_size=0, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fcf000 _llseek(7, 0, [0], SEEK_CUR) = 0 umask(02) = 077 gettimeofday({1173359616, 177807}, NULL) = 0 time([1173359616]) = 1173359616 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb7e610c8) = 3467 --- SIGCHLD (Child exited) @ 0 (0) --- close(7) = 0 munmap(0xb7fcf000, 4096) = 0 waitpid(3467, NULL, 0) = 3467 time([1173359616]) = 1173359616 time(NULL) = 1173359616 gettimeofday({1173359616, 183489}, NULL) = 0 gettimeofday({1173359616, 183686}, NULL) = 0 nanosleep({0, 250000000}, 0) = ? ERESTART_RESTARTBLOCK (To be restarted) +++ killed by SIGSEGV +++</tt></table> This error captured bei gdb <table border width=100%> <tr valign=top> <td width=100%><tt>nagios1:/usr/local/nagios/bin# gdb nagios GNU gdb 6.3-debian Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-linux"...Using host libthread_db library "/lib/tls/libthread_db.so.1". (gdb) r /usr/local/nagios/etc/nagios.cfg Starting program: /usr/local/nagios/bin/nagios /usr/local/nagios/etc/nagios.cfg [Thread debugging using libthread_db enabled] [New Thread -1209560960 (LWP 931)] Nagios 3.0a1 Copyright (c) 1999-2007 Ethan Galstad (http://www.nagios.org) Last Modified: 03-06-2007 License: GPL Nagios 3.0a1 starting... (PID=931) [New Thread -1209775184 (LWP 934)] [New Thread -1218163792 (LWP 935)] Program received signal SIGSEGV, Segmentation fault. [Switching to Thread -1218163792 (LWP 935)] 0xb7eed215 in mallopt () from /lib/tls/libc.so.6 (gdb) bt #0 0xb7eed215 in mallopt () from /lib/tls/libc.so.6 #1 0xb7eebf02 in realloc () from /lib/tls/libc.so.6 #2 0x0807785e in dbuf_strcat (db=0x80c6680, buf=0xb76448c0 "1=1\n2=localhost\n3=\n4=0\n5=1\n6=1\n7=/tmp/nagiosUJ95U0\n8=nan\n9=1173431091.188930\n10=1173431095.208425\n11=0\n12=1\n13=0\n\n") at utils.c:4924 #3 0x08077d70 in check_result_worker_thread (arg=0x0) at utils.c:5373 #4 0xb7fb6b63 in start_thread () from /lib/tls/libpthread.so.0 #5 0xb7f5218a in clone () from /lib/tls/libc.so.6</tt></table> This errors all happened on a Debian Sarge 32Bit Version with the Kernel 2.6.20.1 Thanks in advance, FliTTi