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X-HELO: drew.franken.de
Date: Wed, 22 Mar 2017 09:53:14 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: dlclose() vs fork()
Message-ID: <20170322085314.GB1785@calimero.vinschen.de>
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References: <1504e7ff-dd60-f55f-d00a-0a1ae5d5e034 AT asokolov DOT org> <20170321134200 DOT GA18800 AT calimero DOT vinschen DOT de> <7d43957e-bd64-fdec-a7ef-15f66c29b9bb AT asokolov DOT org>
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On Mar 22 08:44, Alexey Sokolov wrote:
> Thanks Corinna for the quick fix,
> The user confirmed it's working now with the snapshot.
>=20
> 21.03.2017 13:42, Corinna Vinschen =D0=BF=D0=B8=D1=88=D0=B5=D1=82:
> > On Mar 21 09:03, Alexey Sokolov wrote:
> > > Hello,
> > > If the same DLL is dlopen()ed several times, dlclose() will actually
> > > unload the DLL only after the same number of calls to dlclose().
> > >=20
> > > This works fine in cygwin, until we add fork().
> > >=20
> > > It looks like in the child process the counters of inherited DLLs are
> > > set to 1, so the first dlclose() unloads it, causing segfault for
> > > subsequent access to the unloaded code.
> > > https://github.com/znc/znc/issues/1385#issuecomment-288014319 has a
> > > working minimal example of this behavior.
> >=20
> > dlopen/dlclose reference counting was broken.  I applied a fix and
> > uploaded new dev snapshots to https://cygwin.com/snapshots/

Thanks for testing and feedback.


Corinna

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

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