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Date:	Thu, 23 Jul 2020 13:39:33 -0500
Message-ID:	<CAPp9Z=WxvKrFX1WgCLvHK6mDRO3rG0nQ_6W_AvmaAsAZQerHCQ@mail.gmail.com>
Subject:	Re: graph (plotutils) seg-faulting
To:	cygwin <cygwin AT cygwin DOT com>
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From:	Tony Richardson via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Tony Richardson <richardson DOT tony AT gmail DOT com>
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On Thu, Jul 23, 2020 at 12:18 PM Brian Inglis <
Brian DOT Inglis AT systematicsw DOT ab DOT ca> wrote:

>
> On 2020-07-23 11:00, Tony Richardson via Cygwin wrote:
> > On Thu, Jul 23, 2020 at 11:49 AM Ken Brown via Cygwin wrote:
> >> On 7/23/2020 12:48 AM, Marco Atzeri via Cygwin wrote:
> >>> On 23.07.2020 00:12, Ken Brown via Cygwin wrote:
> >>>> On 7/22/2020 6:07 PM, Tony Richardson via Cygwin wrote:
> >>>>> On Wed, Jul 22, 2020 at 3:48 PM Marco Atzeri via Cygwin wrote:
> >>>>>> On 22.07.2020 14:06, Ken Brown via Cygwin wrote:
> >>>>>>> On 7/22/2020 1:36 AM, Marco Atzeri via Cygwin wrote:
> >>>>>>>> On 22.07.2020 02:10, Tony Richardson via Cygwin wrote:
>
> >>>>>>>>> I have attached both the cygcheck and strace output.
>
> >>>>>>>> something is clearly interfering with your Cygwin installation
> >>>>>>>>
> >>>>>>>> --- Process 11136 loaded C:\Applications\cygwin64\bin\cygwin1.dll
> at
> >>>>>>>> 0000000000c80000
> >>>>>>>> --- Process 11136 unloaded DLL at 0000000000c80000
>
> >>>>>>>
> >>>>>>> I can reproduce the problem on my system:
> >>>>>>>
> >>>>>>> $ strace graph
> >>>>>>> ...
> >>>>>>> Segmentation fault
> >>>>>>>
> >>>>>>> I thought that simply rebuilding plotutils might fix the problem,
> >>>>>>> but there were a lot of compilation warnings, and the build
> >>>>>>> failed. Some of the warnings look serious to me, but I have no
> >>>>>>> idea if they could cause Windows to try to load DLLs at strange
> >>>>>>> addresses.
>
> >>>>>> I rebuilt and uploaded a test version 2.6-6 only for 64bit
> >>>>>> try to see if something change
>
> >>>>> I tried the test version, unfortunately it still segfaults for me.
>
> >>> no surprise. It was unlikely to work
>
> >>>> Same for me.  I'm also getting strange output from ldd, but maybe
> >>>> that's just another manifestation of the same problem:
> >>>>
> >>>> $ ldd /usr/bin/graph
> >>>> ntdll.dll => /c/WINDOWS/SYSTEM32/ntdll.dll (0x7ff82a4c0000)
> >>>> KERNEL32.DLL => /c/WINDOWS/System32/KERNEL32.DLL (0x7ff8289c0000)
> >>>> KERNELBASE.dll => /c/WINDOWS/System32/KERNELBASE.dll (0x7ff8280c0000)
> >>>> cygplot-2.dll => /usr/bin/cygplot-2.dll (0x9f0000)
> >>>> cygplot-2.dll => /usr/bin/cygplot-2.dll (0xbf0000)
> >>>> cygplot-2.dll => /usr/bin/cygplot-2.dll (0xbf0000)
> >>>> cygwin1.dll => /usr/bin/cygwin1.dll (0xd20000)
> >>>> [...]
> >>>> cygintl-8.dll => /usr/bin/cygintl-8.dll (0x1760000)
> >>>> cygintl-8.dll => /usr/bin/cygintl-8.dll (0x1760000)
> >>>> cygiconv-2.dll => /usr/bin/cygiconv-2.dll (0x1780000)
> >>>> cygiconv-2.dll => /usr/bin/cygiconv-2.dll (0x1780000)
>
> >>> can you check with
> >>>    cat /proc/self/maps
> >>> Usually I see
>
> > Again nothing unusual.
>
> >> There really does seem to be something peculiar about the graph
> program. I
> >> don't recall ever seeing this behavior with any other program.  Since
> it
> >> doesn't happen to everyone, it might depend on the Windows version.
> Mine
> >> is Windows 10 1909, Build 18363.959.
> >>
> >> I'm going to drop out of this discussion now.  I'm not a graph user,
> and I
> >> only jumped in to confirm that I could reproduce the problem, so that
> the
> >> other posters wouldn't think the problem was just with their systems.
>
> > My office machine (one of the problem machines) is running exactly the
> same
> > version/build of Windows 10.
>
> Office machines tend to run Enterprise builds which may be customized in
> many
> ways unlike OEM/Retail/Home W10.
>
> Check with `which -a graph` that some MS or other module is not being
> injected
> into your search path.
>
>
Unfortunately (at this point), I get just:

/usr/bin/graph

I've restricted the PATH using:

PATH=/usr/bin strace graph

and still get a segfault.

Tony
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