Tomcat silently shuts down after 10 minutes
I'm running Tomcat 9.0.14 on Centos 8 with JDK 15.
Tomcat is loaded in /opt/tomcat, the directory owned by "joe". If I login as
"joe" and start Tomcat, everything is fine.
We have people login to the Centos system to run the business application as
"mary", "jane", "fred" etc. Sometimes they want to shutdown Tomcat, for example
if they wish to load a price update to the DBMS or whatever. To enable them to
do this from within the business application, I wrote a setuid() C program
which sets the effective user as "joe" and executes /opt/tomcat/bin/shutdown.sh
or /opt/tomcat/bin/startup.sh. This does startup Tomcat, but 10 minutes later
it dies. Nothing is logged that is unusual. These are the last few lines when
it dies:
04-Jul-2024 21:45:01.154 INFO [main] org.apache.catalina.startup.Catalina.start
Server startup in [54,789] milliseconds
04-Jul-2024 21:54:10.149 INFO [Thread-3]
org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler
["http-nio-8080"]
04-Jul-2024 21:54:10.157 INFO [Thread-3]
org.apache.catalina.core.StandardService.stopInternal Stopping service
[Catalina]
04-Jul-2024 21:54:10.194 WARNING [Thread-3]
org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web
application [TPDRESTServer] registered the JDBC driver [org.postgresql.Driver]
but failed to unregister it when the web application was stopped. To prevent a
memory leak, the JDBC Driver has been forcibly unregistered.
04-Jul-2024 21:54:10.196 WARNING [Thread-3]
org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web
application [TPDRESTServer] appears to have started a thread named [Tomcat JDBC
Pool Cleaner[862048902:1720093501299]] but has failed to stop it. This is very
likely to create a memory leak. Stack trace of thread:
java.base@15/java.lang.Object.wait(Native Method)
java.base@15/java.util.TimerThread.mainLoop(Timer.java:553)
java.base@15/java.util.TimerThread.run(Timer.java:506)
04-Jul-2024 21:54:10.231 INFO [Thread-3]
org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler
["http-nio-8080"]
04-Jul-2024 21:54:10.243 INFO [Thread-3]
org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler
["http-nio-8080"]
My C program is:
int main (int argc, char *argv[]) {
if (argc != 2) {
printf("%s", "Syntax: ManageTomcat START|STOP");
return(0);
}
printf("%s\n", argv[0]);
printf("%s\n", argv[1]);
setuid(1000);
if(strcmp(argv[1], "STOP")) {
system("/opt/apache-tomcat-9.0.14/bin/startup.sh");
} else {
system("/opt/apache-tomcat-9.0.14/bin/shutdown.sh");
} return(1);
}
Any ideas would be appreciated.
Bryan
Re: Tomcat silently shuts down after 10 minutes
On 7/4/24 2:46 PM, Bryan Buchanan wrote:
I'm running Tomcat 9.0.14 on Centos 8 with JDK 15.
Tomcat is loaded in /opt/tomcat, the directory owned by "joe". If I login as
"joe" and start Tomcat, everything is fine.
We have people login to the Centos system to run the business application as "mary", "jane",
"fred" etc. Sometimes they want to shutdown Tomcat, for example if they wish to load a price update to the
DBMS or whatever. To enable them to do this from within the business application, I wrote a setuid() C program which
sets the effective user as "joe" and executes /opt/tomcat/bin/shutdown.sh or /opt/tomcat/bin/startup.sh. This
does startup Tomcat, but 10 minutes later it dies. Nothing is logged that is unusual. These are the last few lines when
it dies:
04-Jul-2024 21:45:01.154 INFO [main] org.apache.catalina.startup.Catalina.start
Server startup in [54,789] milliseconds
04-Jul-2024 21:54:10.149 INFO [Thread-3] org.apache.coyote.AbstractProtocol.pause Pausing
ProtocolHandler ["http-nio-8080"]
04-Jul-2024 21:54:10.157 INFO [Thread-3]
org.apache.catalina.core.StandardService.stopInternal Stopping service
[Catalina]
04-Jul-2024 21:54:10.194 WARNING [Thread-3]
org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web
application [TPDRESTServer] registered the JDBC driver [org.postgresql.Driver]
but failed to unregister it when the web application was stopped. To prevent a
memory leak, the JDBC Driver has been forcibly unregistered.
04-Jul-2024 21:54:10.196 WARNING [Thread-3]
org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web
application [TPDRESTServer] appears to have started a thread named [Tomcat JDBC
Pool Cleaner[862048902:1720093501299]] but has failed to stop it. This is very
likely to create a memory leak. Stack trace of thread:
java.base@15/java.lang.Object.wait(Native Method)
java.base@15/java.util.TimerThread.mainLoop(Timer.java:553)
java.base@15/java.util.TimerThread.run(Timer.java:506)
04-Jul-2024 21:54:10.231 INFO [Thread-3] org.apache.coyote.AbstractProtocol.stop Stopping
ProtocolHandler ["http-nio-8080"]
04-Jul-2024 21:54:10.243 INFO [Thread-3] org.apache.coyote.AbstractProtocol.destroy
Destroying ProtocolHandler ["http-nio-8080"]
My C program is:
int main (int argc, char *argv[]) {
if (argc != 2) {
printf("%s", "Syntax: ManageTomcat START|STOP");
return(0);
}
printf("%s\n", argv[0]);
printf("%s\n", argv[1]);
setuid(1000);
if(strcmp(argv[1], "STOP")) {
system("/opt/apache-tomcat-9.0.14/bin/startup.sh");
} else {
system("/opt/apache-tomcat-9.0.14/bin/shutdown.sh");
} return(1);
}
Any ideas would be appreciated.
Bryan
I think you should check the return value of setuid.
I don't think you can change the uid of a process that easily.
Otherwise you could also write setuid(0), become root and that would look to me
as a huge security hole.
Regards, ~Z
Re: Tomcat silently shuts down after 10 minutes
On 04.07.24 15:27, Zerro wrote: On 7/4/24 2:46 PM, Bryan Buchanan wrote: I'm running Tomcat 9.0.14 on Centos 8 with JDK 15. Tomcat is loaded in /opt/tomcat, the directory owned by "joe". If I login as "joe" and start Tomcat, everything is fine. We have people login to the Centos system to run the business application as "mary", "jane", "fred" etc. Sometimes they want to shutdown Tomcat, for example if they wish to load a price update to the DBMS or whatever. To enable them to do this from within the business application, I wrote a setuid() C program which sets the effective user as "joe" and executes /opt/tomcat/bin/shutdown.sh or /opt/tomcat/bin/startup.sh. This does startup Tomcat, but 10 minutes later it dies. Nothing is logged that is unusual. These are the last few lines when it dies: If I understand you correctly, debugging why tomcat terminates probably has nothing to do with the way that you start it (e.g. your C program). Instead, to begin with, I'd start with utilizing software that has known bugs fixed: Java 15 is unsupported since March 2021, Tomcat 9.0.14 was released in December 2018 - 9.0.90 is current. There's simply no need to hunt issues that somebody else might have found during the past many years - plus, you might be interested in the security updates that came in since then. If the issue still appears on current versions, you can dive deeper and likely have to debug your own application. It's hard to say where a non-logged termination appears, but my first attempt of finding a low hanging fruit would be to grep for System.exit. Sounds stupid, but the probability to find this is greater than zero. (Don't ask 🫣) Olaf - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat silently shuts down after 10 minutes
> I think you should check the return value of setuid. > > I don't think you can change the uid of a process that easily. > > Otherwise you could also write setuid(0), become root and that would look to > me as a huge security hole. > You need to be root to "chmod u+s [your_program]" so your program can setuid(). It's a standard Unix/Linux paradigm to run a process with another user privilege. Yes it is a security risk if you don't know what you're doing :) - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat silently shuts down after 10 minutes
Hi,
This looks like an orderly shutdown of tomcat, can you attach strace and see if
tomcat process does receive a signal from somewhere?
Mfg Thomas
Am 4. Juli 2024 14:46:17 MESZ schrieb Bryan Buchanan
:
>I'm running Tomcat 9.0.14 on Centos 8 with JDK 15.
>
>Tomcat is loaded in /opt/tomcat, the directory owned by "joe". If I login as
>"joe" and start Tomcat, everything is fine.
>
>We have people login to the Centos system to run the business application as
>"mary", "jane", "fred" etc. Sometimes they want to shutdown Tomcat, for
>example if they wish to load a price update to the DBMS or whatever. To enable
>them to do this from within the business application, I wrote a setuid() C
>program which sets the effective user as "joe" and executes
>/opt/tomcat/bin/shutdown.sh or /opt/tomcat/bin/startup.sh. This does startup
>Tomcat, but 10 minutes later it dies. Nothing is logged that is unusual. These
>are the last few lines when it dies:
>
>04-Jul-2024 21:45:01.154 INFO [main]
>org.apache.catalina.startup.Catalina.start Server startup in [54,789]
>milliseconds
>04-Jul-2024 21:54:10.149 INFO [Thread-3]
>org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler
>["http-nio-8080"]
>04-Jul-2024 21:54:10.157 INFO [Thread-3]
>org.apache.catalina.core.StandardService.stopInternal Stopping service
>[Catalina]
>04-Jul-2024 21:54:10.194 WARNING [Thread-3]
>org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web
>application [TPDRESTServer] registered the JDBC driver [org.postgresql.Driver]
>but failed to unregister it when the web application was stopped. To prevent a
>memory leak, the JDBC Driver has been forcibly unregistered.
>04-Jul-2024 21:54:10.196 WARNING [Thread-3]
>org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The
>web application [TPDRESTServer] appears to have started a thread named [Tomcat
>JDBC Pool Cleaner[862048902:1720093501299]] but has failed to stop it. This is
>very likely to create a memory leak. Stack trace of thread:
>java.base@15/java.lang.Object.wait(Native Method)
>java.base@15/java.util.TimerThread.mainLoop(Timer.java:553)
>java.base@15/java.util.TimerThread.run(Timer.java:506)
>04-Jul-2024 21:54:10.231 INFO [Thread-3]
>org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler
>["http-nio-8080"]
>04-Jul-2024 21:54:10.243 INFO [Thread-3]
>org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler
>["http-nio-8080"]
>
>My C program is:
>
>int main (int argc, char *argv[]) {
>if (argc != 2) {
>printf("%s", "Syntax: ManageTomcat START|STOP");
>return(0);
>}
>printf("%s\n", argv[0]);
>printf("%s\n", argv[1]);
>
>setuid(1000);
>
>if(strcmp(argv[1], "STOP")) {
>system("/opt/apache-tomcat-9.0.14/bin/startup.sh");
>} else {
>system("/opt/apache-tomcat-9.0.14/bin/shutdown.sh");
>} return(1);
>}
>Any ideas would be appreciated.
>
>Bryan
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