Charles-François Natali <neolo...@free.fr> added the comment:

Digging a little deeper:
- in ./Modules/fpectlmodule.c, the longjmp() is actually not used at all (dead 
code)
- in Modules/readline.c, the jmp_buf is correctly initialized (well, there's a 
tiny race condition because SIGINT handler is installed before setjmp() 
initializes jbuf, but it's not worth fixing)

In this case, I'm 99% sure the culprit is:
import pycurl

That's a know bug in libcurl:
"longjmp causes uninitialized stack frame" in libcurl's alarmfunc running 
gwibber-daemon
https://bugzilla.redhat.com/show_bug.cgi?id=539809

Suggesting to close as invalid.

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<http://bugs.python.org/issue12468>
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