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Date: Wed, 30 Jan 2019 12:20:38 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Recent snapshots somewhat fail under W7
Message-ID: <20190130112038.GD3912@calimero.vinschen.de>
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References: <C30559ED-BDE5-4BC0-B9C0-1499D5832B29 AT Denis-Excoffier DOT org>
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On Jan 29 23:50, Denis Excoffier wrote:
> Hello,
>=20
> I tried the (numerous) recent snapshots with W10 (1709) with no
> problem (except for the isolated 20190115 snapshot and also that =C2=AB cp
> cygwin0.dll /usr/bin/cygwin1.dll =C2=BB now fails but this is another
> story). The recent snapshots with W7 fail somewhat (but the system
> seems to function more or less), i've got the following message with
> W7:
>=20
>       0 [main] tcsh 15528 fixup_mmaps_after_fork: VirtualQueryEx
>       failed for MAP_PRIVATE address 0x6FFFFFA0000, Win32 error 5 368
>       [main] tcsh 15528
>       D:\Users\dexcoff1\dexcoff1\cyglcl\uxl\tcsh-6.20.00\bin\tcsh.exe:
>       *** fatal error in forked process -
>       recreate_mmaps_after_fork_failed 700 [main] tcsh 15528
>       cygwin_exception::open_stackdumpfile: Dumping stack trace to
>       tcsh.exe.stackdump 0 [main] tcsh 19080 fork: child -1 - forked
>       process 15528 died unexpectedly, retry 0, exit code 0x100, errno
>       11 No more processes.
>=20
> I had a look into sigproc.cc <http://sigproc.cc/> and noticed that
> recently (commit 69cc7a068656b5c6ef07ca079a213f801e02e650, dated
> 2019-01-27, DUPLICATE_SAME_ACCESS has been replaced by 0 in a call to
> DuplicateHandle(). I switched it back, re-compiled and the fork
> problem above disappeared. Don=E2=80=99t know the impact on W10.
>
> HTH.

Kind of.  This patch is not switch to 0 something, but from automatic
permission inheritence to explicit, minimal permissions required.

I was going to ask for a testcase and more info about your system(*)
but then I was able to reproduce it myself.  It seems W7 needs more
permissions for VirtualQueryEx than Windows 8 and later.  I applied a
patch.  New test release coming soon.


Corinna

(*) It would really be nice not having to ask for these infos every time.

--=20
Corinna Vinschen
Cygwin Maintainer

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