Re: [PATCHSET] ptrace,signal: group stop / ptrace updates
From: Ingo Molnar
Date: Fri Jan 28 2011 - 11:55:26 EST
I'm hijacking this thread, to report a signal handling bug that Linux and Bash has,
and which has been there at least for 10 years since i started using SMP Linux
It's not easy to reproduce but today i found a reproducer - maybe you guys have an
idea what's going on.
There's two very simple scripts, one calls the other in an infinite loop:
$ cat test-signal
while true; do ./test-signal2; done
$ cat test-signal2
The bug is that occasionally Ctrl-C does not get processed, and that the Ctrl-C is
'lost'. It can be reproduced here by running ./test-signal several times, and
See that '^C^C' line? That is where i had to do Ctrl-C twice.
It only fails here about once every 10 times, so it's very rare. I have a stock F14
system running on that box, with the very latest .38 based kernel.
Any ideas what's going on?
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