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Created attachment 1118399 [details] gdb backtrace $ ncat localhost 80 # or some other port where something's listening ^\Quit (core dumped) (The ^\Quit above is a result of pressing Ctrl+@) gdb backtrace attached.
(Oops, it's Ctrl+\ I'm sending that triggers the coredump, not Ctrl+@)
This is expected behaviour. http://www.gnu.org/software/libc/manual/html_node/Termination-Signals.html """ The SIGQUIT signal is similar to SIGINT, except that it’s controlled by a different key—the QUIT character, usually C-\—and produces a core dump when it terminates the process, just like a program error signal. You can think of this as a program error condition “detected” by the user. """