Threads
Jon TURNEY
jon.turney@dronecode.org.uk
Thu Oct 23 11:31:00 GMT 2014
On 20/10/2014 14:03, Ken Brown wrote:
> Or is there some other plausible explanation for "impossible" crashes?
> This can't just be a result of a gdb bug, because in at least one case
> the assertion can be shown to be valid by using printf instead of gdb.
>
> [*] By "impossible" I mean that examination of the relevant variables in
> gdb shows that the assertions are in fact true. Two ongoing examples are
>
> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=18438
> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=18769
As a suggestion, you might want to also take a careful look at how
signal delivery is implemented in cygwin on x86_64
I had a vague idea that there was, at some time in the past, a fix made
for register corruption on x86_64 after a signal was handled, but I
can't find it now, so maybe I imagined it. But if for e.g. the flags
register was getting corrupted when a signal interrupts the main thread,
that could perhaps also explain what is being seen.
(More generally, it doesn't have to be another thread which is causing
these problems, it could be some form of interrupt)
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