[LTP] [PATCH v2] tst_test: using SIGTERM to terminate process

[Petr Vorel <pvorel@suse.cz>]

Hi Cyril,

> Hi!
> > setup()
> > {
> > 	tst_brk TCONF "quit now!"
> > }

> > do_test()
> > {
> > 	tst_res TPASS "pass :)"
> > }

> > tst_run
> > EOF

> > # while true; do ./debug.sh; done

> I managed to reproduce this in dash. I bet that this is a bug where
> signal handler inside dash is temporarily disabled when we install the
> trap and if we manage to hit that window the signal is discarded. At
> least that is my working theory. After I've installed debug prints, in
> the cases where it hangs the signal was sent just before have installed
> the trap. And in some cases when the signal arrives the timer process is
> killed but the trap is not invoked. So it really looks like signal
> handling in dash is simply broken. Not sure what we can do about bugs
> like this apart from switching to a real programming language.

Thanks for the debugging. *bash* is also affected, at least some releases.
I reproduced it also on some older SLES, with bash 4.4.

Kind regards,
Petr