running jstack on Jboss process?

[mgarber]

Is there Jboss-specific reason I can't run jstack against Jboss process?

OS is RedHat, JDK 1.5, jstack works fine against Tomcat on the same machine

Error:

Attaching to process ID 29417, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 1.5.0_05-b05
Thread 30393: (state = IN_NATIVE)
Error occurred during stack walking:
sun.jvm.hotspot.debugger.DebuggerException:
sun.jvm.hotspot.debugger.DebuggerException: get_thread_regs failed for a lwp

thanks!

[mgarber]

The problem seems to be specific to RedHat AS 4, all other Linux flavors I tried it on work fine.