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anselm-helbig/gist:3667085

Created September 7, 2012 15:18
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Get a backtrace from a hanging ruby process
Raw
gistfile1.txt
Say you have one process in an endless loop. You know its process id:
ruby -e 'puts $$; loop {}'
=> 30360, hangs
You can attach to this process with gdb now and make it print a backtrace to stdout:
gdb -p 30360
GNU gdb (GDB) 7.5
Copyright (C) 2012 Free Software Foundation, Inc.
[...]
(gdb) call rb_backtrace()
(gdb) detach
Detaching from program: /usr/local/rvm/rubies/ruby-1.9.3-p194/bin/ruby, process 30360
(gdb) quit
Might come in handy from time to time.
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