Creating PDF's using cfdocument hangs the server

We are running two ColdFusion 9 servers on Suse linux 11.3, 64 bit. We are current on all our hot fixes.
Over time (a couple of days usually) all of our PDF reports hang. No exceptions are thrown. Eventually they timeout. A server reboot is required to fix the problem. The rest of the app functions fine.
Once this condition occures, all of the PDF reports hang (some reports have a lot of data....some have minimal). If the <cfdocument> tag is empty, the report will execute normally, but even just "hello world" in the cfdocument tag hangs. I am guessing that there is some system resource that it is waiting for--a thread, memory, etc. But the rest of the app runs fine, so it appears to be something specific to <cfdocument>. We are currently configured with 3G jvm, 360 jvm threads.
These same reports have been running for a couple of years on cf8 and cf9 (with no hotfixes). We deployed a new app on cf9 (with hotfixes) about a month ago which is when the problem started.
We are not sure what else to try....server reboots are getting old. Any comments would be appreciated.

The best thing you can do in this situation is to examine the server during the failure condition. You do this by generating a stack trace. There are several ways to generate a stack trace from running commands on your Linux server to using features of the ColdFusion Admin API. Here are some links to get your started.
Generating a snapshot/stack trace via code using the CF Admin API.
http://awe.st/fX6HEy
PDF of presentation notes and stack trace options from Charlie Arehart.
http://awe.st/eVvgpw
Once you've generated the stack trace you need to look through it for issues with memory (JVM heap), CPU, locked threads etc. Reading stack traces is not the easiest thing to do, especially making decisions on what to do based on what you see. In other words, it'd be hard to cover everything in a forum post. But, this sort of analysis should help you figure out more about what is happening during the failure condition.

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