Hi Jim,Really hoping that someone might be able to help us with this. We are experiencing Signal 11 crashes on our tomcat server. We have tried almost every configuration that I can think of and we are still getting these crashes at least once a week, sometimes twice a day. Unfortunately we can not reproduce this anywhere except production. Here is the current setup:
RedHat AS 2.1 Kernel: 2.4.18-3smp Memory: 2.5GB JDK: IBM 1.4.1 Tomcat 4.1.29
We are using mod_jk to talk to the Apache server (2.0.x) and the native DB2 jdbc driver to talk to our DB2 databases. We have also tried Tomcat 4.0.6 and Sun's JDK v. 1.4.1_01 and 1.4.2 on RH 7.3. We are passing the following settings to the JVM: -Xms512m -Xmx1024m.
We have also tried running this on three different boxes to try and isolate hardware failures, but all machines experience crashes in the same way.
Thanks in advance for any help.
Here is the beginning of the error (full file is too big):
JVMDG217: Dump Handler is Processing a Signal - Please
Wait.
JVMDG303: JVM Requesting Java core file
JVMDG308: Error writing Java core buffer to file:
Permission denied
NULL ------------------------------------------------------------------------
0SECTION TITLE subcomponent dump routine
NULL ===============================
1TISIGINFO signal 11 received 1TIDATETIME Date: 2003/11/12 at
08:19:26
1TIFILENAME Javacore filename: /usr/local/tomcat/javacore.20031112.081926.15871.txt
NULL ------------------------------------------------------------------------
0SECTION XHPI subcomponent dump routine
NULL ==============================
1HPTIME Wed Nov 12 08:19:26 2003
1HPSIGRECV SIGSEGV received in ?? at 0x41cc8e85 in
/opt/IBMJava2-141/jre/bin/libjitc.so. Processing
terminated.
1HPFULLVERSION J2RE 1.4.1 IBM build cxia32141-20030522
NULL 1HPOPENV Operating Environment
NULL ---------------------
2HPHOSTNAME Host : a002.(none)
2HPOSLEVEL OS Level : 2.4.18-3smp.#1 SMP
Thu Apr 18 07:27:31 EDT 2002
2HPLIBCVER glibc Version : 2.2.4
2HPCPUS Processors -
3HPARCH Architecture : (not implemented)
3HPNUMCPUS How Many : (not implemented)
3HPCPUSENABLED Enabled : 4
NULL 1HPMEMINFO Memory Info
NULL -----------
2HPMEMLINE total: used: free: shared: buffers: cached:
2HPMEMLINE Mem: 2644201472 537800704 2106400768 0 143089664 120524800
2HPMEMLINE Swap: 2096857088 0 2096857088
2HPMEMLINE MemTotal: 2582228 kB
2HPMEMLINE MemFree: 2057032 kB
2HPMEMLINE MemShared: 0 kB
2HPMEMLINE Buffers: 139736 kB
2HPMEMLINE Cached: 117700 kB
2HPMEMLINE SwapCached: 0 kB
2HPMEMLINE Active: 409700 kB
2HPMEMLINE Inact_dirty: 33040 kB
2HPMEMLINE Inact_clean: 6028 kB
2HPMEMLINE Inact_target: 89752 kB
2HPMEMLINE HighTotal: 1703860 kB
2HPMEMLINE HighFree: 1393124 kB
2HPMEMLINE LowTotal: 878368 kB
2HPMEMLINE LowFree: 663908 kB
2HPMEMLINE SwapTotal: 2047712 kB
2HPMEMLINE SwapFree: 2047712 kB
2HPMEMLINE Committed_AS: 349996 kB
sounds bad, signal 11 on Linux is a warm up for material problems!!!
It could mean :
- machine overclocking with CPU overheated (I guess that's not the case for a production machine :) )
- or bad memory
- any other ugly hardware problem
But I can't see any Tomcat incidence with such problems...
It 's a hardware one...
The first thing to do is to chek cup your memory with any MS DOS floppy disk containing Goldmemory or such tool...
Sorry for my poor english written
HTH
Jerome
-- Auteur cahier du programmeur Java tome 2 - Eyrolles 10/2003 http://www.editions-eyrolles.com/php.informatique/index.php3?xd=d12eccd83077cb3683315026cd3b7586
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