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[bluetooth-dev] How to debug stack in user mode??

What should I do if I wanna debug the stack in user mode??
When I run stack in user mode, GDB complains with the message "Program received signal ?, Unknown signal" and stops
at function call 'pthread_cread(...)'.
I use GDB with version 4.18...
I'd like to know if I should set some environment variables of GDB
or could not use pthread debugging facilities with my GDB version..
Thank you all!!