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Subject:	Re: fork fails after nmap with hint address in an unmapped memory region
To:	cygwin AT cygwin DOT com
References:	<b431898c-30f5-2847-c922-0f25a525ef76 AT yahoo DOT fr> <15510444518 DOT 20171209184819 AT yandex DOT ru>
From:	"Stéphane Mbape via cygwin" <cygwin AT cygwin DOT com>
Reply-To:	=?UTF-8?Q?St=c3=a9phane_Mbape?= <smbape AT yahoo DOT fr>
Message-ID:	<c327a625-35f4-d02a-fbcb-c2694e9695c3@yahoo.fr>
Date:	Sun, 10 Dec 2017 02:23:45 +0100
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I used a temporary fix that may give you a hint.

hint_addr = hint_addr - hint_addr % getpagesize(); // temporary fix

I also used it in luajit, which uses a random hint_addr, and everything is fine.

On 09/12/2017 18:29, Brian Inglis wrote:

    On 2017-12-09 08:53, Stéphane Mbape via cygwin wrote:

        Le 09/12/2017 à 16:48, Andrey Repin a écrit :

                While embeding luajit in a c  program, I found myself unable to fork
                processes.
                Investigations prove that it was related to nmap.
                To be accurate, calling nmap with hint address in a unmapped memory
                region will cause all forks to fail with
                "fixup_mmaps_after_fork: ReadProcessMemory failed for MAP_PRIVATE
                address 0x6FFFFFE0000, Win32 error 299"
                There is a sample code below.

            You forgot to mention Cygwin version you're using, and please provide the
            sample as an attach to save people the copy-pasting issues.

        Cygwin version: 2.9.0
        OS: Windows 10
        Arch: 64bit
        The sample was also attached.

    Confirmed reproducible; addr2line does not give anything useful from the
    stackdump, but included raw stackdump below, in case it gives hints.


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