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Date: Mon, 7 Apr 2014 13:45:02 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Tons of cygserver errors
Message-ID: <20140407114502.GI2061@calimero.vinschen.de>
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References: <5F8AAC04F9616747BC4CC0E803D5907D0C8ADCB0 AT MLBXv04 DOT nih DOT gov> <20140407095722 DOT GH2061 AT calimero DOT vinschen DOT de>
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On Apr  7 11:57, Corinna Vinschen wrote:
> On Apr  5 02:35, Lavrentiev, Anton (NIH/NLM/NCBI) [C] wrote:
> > >> I can=E2=80=99t push this through your list spam filter.  Another at=
tempt...
> >=20
> > I was trying a few times, and finally deleted the strace attachment.  L=
et's see if this will go through.
> > Excuse me for being a bit straightforward, but the spam filter this lis=
t is using is *really* stupid!
> >=20
> > > Still, you're missing the cygcheck log,
> >=20
> > Cygcheck log was attached to an earlier message from today (thread: exe=
.stackdump is always empty).
> >=20
> > > and a simple testcase would be helpful
> >=20
> > Here you go:
> > [...]
> > Windows event log immediately recorded 10 new events, like so:
> >=20
> > Error	4/4/2014 10:02:34 PM	cygserver	0	None
> > Error	4/4/2014 10:02:33 PM	cygserver	0	None
> > Error	4/4/2014 10:02:32 PM	cygserver	0	None
> > Error	4/4/2014 10:02:31 PM	cygserver	0	None
> > Error	4/4/2014 10:02:30 PM	cygserver	0	None
> > Error	4/4/2014 10:02:29 PM	cygserver	0	None
> > Error	4/4/2014 10:02:28 PM	cygserver	0	None
> > Error	4/4/2014 10:02:27 PM	cygserver	0	None
> > Error	4/4/2014 10:02:26 PM	cygserver	0	None
> > Error	4/4/2014 10:02:25 PM	cygserver	0	None
> >=20
> > (each having exactly the same message: cygserver: PID 1944: cygserver: =
error getting signal_arrived to server (6))
>=20
> Thanks, I can reproduce the issue.  I'll investigate.

Ok, I see what happens.  At fork time, cygserver gets called to fixup
the information on XSI shared memory regions.  When this fixup call is
made, the handle value sent to cygserver is invalid.  It's, in fact, the
value of this object in the parent process, while the object doesn't
exist at this point in the forked child.  The child value is set to NULL
just a little bit later and created as soon as it's required, but this
happens too late for the aforementioned fixup call.

I created a fix and I'm just building cygwin 1.7.29 with it.


Thanks,
Corinna

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

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