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Subject: Re: dlclose() vs fork()
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References: <1504e7ff-dd60-f55f-d00a-0a1ae5d5e034 AT asokolov DOT org> <20170321134200 DOT GA18800 AT calimero DOT vinschen DOT de>
From: Alexey Sokolov <alexey+cygwin AT asokolov DOT org>
Message-ID: <7d43957e-bd64-fdec-a7ef-15f66c29b9bb@asokolov.org>
Date: Wed, 22 Mar 2017 08:44:35 +0000
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Thanks Corinna for the quick fix,
The user confirmed it's working now with the snapshot.

21.03.2017 13:42, Corinna Vinschen пишет:
> 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().
>>
>> This works fine in cygwin, until we add fork().
>>
>> 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.
>
> dlopen/dlclose reference counting was broken.  I applied a fix and
> uploaded new dev snapshots to https://cygwin.com/snapshots/
>
> I'm just building a 2.8.0-0.2 test release as well.
>
>
> Please test.
>
>
> Thanks,
> Corinna
>


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