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Date: Tue, 28 Oct 2014 15:18:58 +0100
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: [GOLDSTARS] Re: Threads
Message-ID: <20141028141858.GK20607@calimero.vinschen.de>
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References: <54450835.3050602@cornell.edu> <5448E6F9.8040005@dronecode.org.uk> <5448EEBF.3020706@cornell.edu> <20141023153730.GC20607@calimero.vinschen.de> <544A327E.9090006@dronecode.org.uk> <20141024125416.GK20607@calimero.vinschen.de> <20141024135231.GL20607@calimero.vinschen.de> <544F736F.2020900@dronecode.org.uk> <20141028114032.GJ20607@calimero.vinschen.de> <544F9E4E.9080107@cornell.edu>
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On Oct 28 09:46, Ken Brown wrote:
> On 10/28/2014 7:40 AM, Corinna Vinschen wrote:
> >On Oct 28 10:43, Jon TURNEY wrote:
> >>On 24/10/2014 14:52, Corinna Vinschen wrote:
> >>>I discussed this with my college Kai Tietz (many thanks to him from
> >>>here), and we came up with a problem in sigdelayed in the 64 bit case:
> >>>pushf is called *after* aligning the stack with andq.  This alignment
> >>>potentially changes the CPU flag values so the restored flags are
> >>>potentially not the flags when entering sigdelayed.
> >>>
> >>>I just applied a patch and created new snapshots on
> >>>https://cygwin.com/snapshots/
> >>>
> >>>I couldn't reproduce the problem locally, so I'd be grateful if you
> >>>could test if that fixes the problem in your testcase, Jon.
> >>
> >>I've tried that snapshot with both my testcase and emacs, without probl=
ems.
> >>
> >>Thanks very much for fixing this!
> >
> >Thanks again to Kai Tietz for helping me with this.
>=20
> And thanks to Eli for suggesting that we look for corruption of the flags
> register, and to Jon for providing the test case that narrowed it down to
> signal handling.

Absolutely.  Since that's a serious but very subtil error, and you all
were very resourceful and diligent helping to fix it, I buy us all a
round of goldstars.


Thanks guys,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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