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Hello,

I have a Java process that, every once in a while, died a sudden death
with "Unknown signal 33".

This is a process that is invoked every 2 hours from a shell script
that runs as a cron job. The java command line looks like this:

java -Dlog4j.configuration=../etc/log4j.xml -server -Xmx512m -Xms256m
my.Class


I have:

java version "1.4.2_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05)
Java HotSpot(TM) Client VM (build 1.4.2_04-b05, mixed mode)

This is on Linux with kernel 2.4.20.


Google doesn't give much for "unknown signal 33". Does anyone know
what this could be?

Thanks.

On 24 Aug 2004 00:37:09 -0700, OtisUsenet wrote:
> I have a Java process that, every once in a while, died a sudden
> death with "Unknown signal 33".

[...]

> This is on Linux with kernel 2.4.20.
>
> Google doesn't give much for "unknown signal 33". Does anyone know
> what this could be?

According to "kill -l" on my system, signal 33 is SIGRTMIN.
LinuxThreads uses the first three RT signals, so I'll hazard a guess
that there is a threading issue with your application.

If you write some native code to catch the signal, you might be able
to determine where it came from.

Do "man 7 signal" and scroll down to "Real-time Signals" for more.

You might get better help in a Linux newsgroup.

/gordon

--
[ do not email me copies of your followups ]
g o r d o n + n e w s @ b a l d e r 1 3 . s e

Gordon Beaton <> wrote in message news:<412af2e4$>...
> On 24 Aug 2004 00:37:09 -0700, OtisUsenet wrote:
> > I have a Java process that, every once in a while, died a sudden
> > death with "Unknown signal 33".
>
> [...]
>
> > This is on Linux with kernel 2.4.20.
> >
> > Google doesn't give much for "unknown signal 33". Does anyone know
> > what this could be?
>
> According to "kill -l" on my system, signal 33 is SIGRTMIN.
> LinuxThreads uses the first three RT signals, so I'll hazard a guess
> that there is a threading issue with your application.
>
> If you write some native code to catch the signal, you might be able
> to determine where it came from.
>
> Do "man 7 signal" and scroll down to "Real-time Signals" for more.
>
> You might get better help in a Linux newsgroup.
>
> /gordon

Hm, my app is single-threaded. Is it possible that this comes from
some threading issues internal to the JVM implementation, and not
from my application?

Thanks.