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Date:	Thu, 23 Jul 2020 12:00:44 -0500
Message-ID:	<CAPp9Z=XQS78DrEUtwGZsi-bg3YHVVJnqJYmM1C4cccA1+JPtpQ@mail.gmail.com>
Subject:	Re: graph (plotutils) seg-faulting
To:	Ken Brown <kbrown AT cornell DOT edu>
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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 11:49 AM Ken Brown via Cygwin <cygwin AT cygwin DOT com>
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 <
> cygwin AT cygwin DOT com>
> >>> 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.
> >>>>>>>
> >>>>>>> Tony Richardson
> >>>>>>>
> >>>>>>
> >>>>>> 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.
> >>>>>
> >>>>> Ken
> >>>>> --
> >>>>
> >>>> Hi Ken,
> >>>> I rebuilt and uploaded a test version 2.6-6 only for 64bit
> >>>> try to see if something change
> >>>>
> >>>> Regards
> >>>> Marco
> >>>>
> >>>
> >>> 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)
> >>
> >> Ken
> >> --
> >
> >
> > can you check with
> >    cat /proc/self/maps
> >
> > Usually I see
> >
> [snip]
>
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.
>
> Ken
>

My office machine (one of the problem machines) is running exactly the same
version/build of Windows 10.

Tony
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