Hi Ludwig, I suggest doing a kill -3 to the java process and inspected the thread dump on catalina.out
Regards, - Juanjo From: [email protected] [mailto:[email protected]] On Behalf Of Ludwig Isaac Lim Sent: 26 March 2013 14:31 To: PLUG PLUG Subject: [plug] Need Help on problematic tomcat / apache / SiteMinder setup Hi: Our web application is running on tomcat 5.5.23 and apache 2.x (on Linux 2.6.18-194.3.1.el5). After 12 hours the application would just halt. The application log and the catalina.out does not indicate any problems (i.e. no exception thrown). JVM is java 1.5.20 (Sun) I noticed that each time this occur, apache would spawn many child processes. I did an strace and here's what I found # strace of parent httpd process select(0, NULL, NULL, NULL, {1, 0}) = 0 (Timeout) wait4(-1, 0x7ffff3636e8c, WNOHANG|WSTOPPED, NULL) = 0 select(0, NULL, NULL, NULL, {1, 0}) = 0 (Timeout) wait4(-1, 0x7ffff3636e8c, WNOHANG|WSTOPPED, NULL) = 0 select(0, NULL, NULL, NULL, {1, 0}) = 0 (Timeout) wait4(-1, 0x7ffff3636e8c, WNOHANG|WSTOPPED, NULL) = 0 select(0, NULL, NULL, NULL, {1, 0}) = 0 (Timeout) # strace of the child httpd process Process 26138 attached - interrupt to quit read(21, <unfinished ...> Process 26138 detached #strace of tomcat Process 3566 attached - interrupt to quit accept(29, Our application use SiteMinder as authentication mechanism, and SiteMinder would spew logs (on httpd error_log) get trying to get semaphore and SiteMinder agent running. Any ideas on how should I proceed to troubleshoot? Does anyone encounter this problem before? Thanks in advance. Regards, Ludwig
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