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Sometimes using [[GDB]] on a system server can result in a [[deadlock]].  You
can however still use GDB by using the [`set
noninvasive`](http://sourceware.org/gdb/current/onlinedocs/gdb_19.html#Hurd%20Native)
option.  This indicates to GDB to not stop the program but allows you to
nevertheless examine its state.  Thus, you can get back traces and value of
variables (and watch them change underneath you).