View User Mode Call Stack of Hung Process


 
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# 1  
View User Mode Call Stack of Hung Process

I have a multithreaded usermode program(actually a daemon) which is in hanged state.

To debug it I tried attaching the process to gdb, but the gdb hangs.
gstack also gets hanged.


I peeped into the proc file system and saw the process to be in sleeping state.
/proc/sysrq-trigger I guess will only give me kernel stack and info,

Is there any possible to view USER MODE stack trace of all the threads of the hung daemon / process without using gdb?
# 2  
Force a core dump - then examine the core with a debugger like gdb. If the process is hung it is not working, killing it nicely or killing to force a core dump are both acceptable.
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