Re: graph (plotutils) seg-faulting

[Tony Richardson <richardson.tony@gmail.com>]

On Tue, Jul 21, 2020 at 9:51 AM Brian Inglis <
Brian.Inglis@systematicsw.ab.ca> wrote:

> On 2020-07-20 22:28, Marco Atzeri via Cygwin wrote:
> > On 21.07.2020 05:12, briand@pounceofcats.com wrote:
> >> On Sun, 19 Jul 2020 21:15:26 +0200
> >> Marco Atzeri via Cygwin <cygwin@cygwin.com> wrote:
> >>>> Can I just back up my home directory, kill the entire cygwin64
> directory and
> >>>> start over ?
> >>> I suggest to install in a parallel directory, they works fine without
> >>> interference, eg in my system I have:
> >>> In this way you can copy your home more easily and kill the old one
> when
> >>> everything is fine.
> >> I tell you my work machine is just cursed.  Installed a fresh cygwin,
> the only
> >> package i chose was plotutils, and i get the exact same problem.
> >> Not sure where to go from here...
> > I bet the curse is a BLODA
> > https://cygwin.com/faq/faq.html#faq.using.bloda
> > also as I noted that the loading address of your DLLs is **very** low
> > my pc:
> > $ grep cygwin1.dll graph.strace
> > --- Process 84828 loaded D:\cygwin64\bin\cygwin1.dll at 0000000180040000
> > your strace
> > $ grep cygwin1.dll temp.txt
> > --- Process 3080 loaded C:\cygwin64\bin\cygwin1.dll at 0000000000ce0000
> > --- Process 3080 loaded C:\cygwin64\bin\cygwin1.dll at 0000000000ee0000
> > --- Process 3080 loaded C:\cygwin64\bin\cygwin1.dll at 00000000014f0000
> > can you exclude the AV from your cygwin directory ?
>
> Nasty slow AV hiding itself by intercepting the DLL loader and slowing all
> your
> programs by reloading every DLL on every call! How can you get any work
> done at
> that rate? You need a Xeon to get an Atom's worth of work done. ;^<
> If you don't already have one, you could request a workstation with that
> CPU,
> 64GB max speed RAM, and giant SSD to counteract the impact of the AV, or
> request
> they come up with an alternative approach. ;^>
>
> If you can't provide a full cygcheck, at least cygcheck and ldd
> cygwin1.dll and
> graph and provide the list of DLLs invoked, which may show interceptions,
> and
> may sometimes be avoided by adjusting Cygwin PATH; e.g.:
>
> $ for e in /bin/cygwin1.dll /bin/graph; do
>     for p in /bin/cygcheck /bin/ldd; do
>       echo \$ $p $e; $p $e;
>     done;
>   done | sed 's!^\t!!;s!\\!/!g;s!/cygdrive/c/!c:/!;s!C:/cygwin/!/!'
> $ /bin/cygcheck /bin/cygwin1.dll
> /bin/cygwin1.dll
>   C:/Windows/system32/KERNEL32.dll
>     C:/Windows/system32/ntdll.dll
>     C:/Windows/system32/KERNELBASE.dll
> $ /bin/ldd /bin/cygwin1.dll
> ntdll.dll => c:/Windows/SYSTEM32/ntdll.dll (0x7ffb78b40000)
> KERNEL32.DLL => c:/Windows/System32/KERNEL32.DLL (0x7ffb77c90000)
> KERNELBASE.dll => c:/Windows/System32/KERNELBASE.dll (0x7ffb76940000)
> advapi32.dll => c:/Windows/System32/advapi32.dll (0x7ffb76d50000)
> msvcrt.dll => c:/Windows/System32/msvcrt.dll (0x7ffb78380000)
> sechost.dll => c:/Windows/System32/sechost.dll (0x7ffb77bf0000)
> RPCRT4.dll => c:/Windows/System32/RPCRT4.dll (0x7ffb78760000)
> CRYPTBASE.DLL => c:/Windows/SYSTEM32/CRYPTBASE.DLL (0x7ffb753d0000)
> bcryptPrimitives.dll => c:/Windows/System32/bcryptPrimitives.dll
> (0x7ffb768c0000)
> $ /bin/cygcheck /bin/graph
> /bin/graph.exe
>   /bin/cygplot-2.dll
>     /bin/cygwin1.dll
>       C:/Windows/system32/KERNEL32.dll
>         C:/Windows/system32/ntdll.dll
>         C:/Windows/system32/KERNELBASE.dll
>     /bin/cygpng16-16.dll
>       /bin/cygz.dll
>     /bin/cygX11-6.dll
>       /bin/cygxcb-1.dll
>         /bin/cygXau-6.dll
>         /bin/cygXdmcp-6.dll
>     /bin/cygXaw-7.dll
>       /bin/cygXext-6.dll
>         /bin/cyggcc_s-seh-1.dll
>       /bin/cygXmu-6.dll
>         /bin/cygXt-6.dll
>           /bin/cygICE-6.dll
>           /bin/cygSM-6.dll
>             /bin/cyguuid-1.dll
>               /bin/cygintl-8.dll
>                 /bin/cygiconv-2.dll
>       /bin/cygXpm-4.dll
> $ /bin/ldd /bin/graph
> ntdll.dll => c:/Windows/SYSTEM32/ntdll.dll (0x7ffb78b40000)
> KERNEL32.DLL => c:/Windows/System32/KERNEL32.DLL (0x7ffb77c90000)
> KERNELBASE.dll => c:/Windows/System32/KERNELBASE.dll (0x7ffb76940000)
> cygplot-2.dll => /usr/bin/cygplot-2.dll (0x3bb760000)
> cygwin1.dll => /usr/bin/cygwin1.dll (0x180040000)
> cygpng16-16.dll => /usr/bin/cygpng16-16.dll (0x3bb610000)
> cygXext-6.dll => /usr/bin/cygXext-6.dll (0x3eb640000)
> cygXaw-7.dll => /usr/bin/cygXaw-7.dll (0x3eb710000)
> cygXt-6.dll => /usr/bin/cygXt-6.dll (0x3eb220000)
> cygX11-6.dll => /usr/bin/cygX11-6.dll (0x3eb7b0000)
> cygz.dll => /usr/bin/cygz.dll (0x3b2da0000)
> cyggcc_s-seh-1.dll => /usr/bin/cyggcc_s-seh-1.dll (0x3dd6b0000)
> cygXmu-6.dll => /usr/bin/cygXmu-6.dll (0x3eb300000)
> cygXpm-4.dll => /usr/bin/cygXpm-4.dll (0x3eb2d0000)
> cygICE-6.dll => /usr/bin/cygICE-6.dll (0x3ffc80000)
> cygSM-6.dll => /usr/bin/cygSM-6.dll (0x3ebb40000)
> cygxcb-1.dll => /usr/bin/cygxcb-1.dll (0x3b2f90000)
> cyguuid-1.dll => /usr/bin/cyguuid-1.dll (0x3b73e0000)
> cygXau-6.dll => /usr/bin/cygXau-6.dll (0x3eb780000)
> cygXdmcp-6.dll => /usr/bin/cygXdmcp-6.dll (0x3eb660000)
> cygintl-8.dll => /usr/bin/cygintl-8.dll (0x3c2560000)
> cygX11-6.dll => /usr/bin/cygX11-6.dll (0xcd0000)
> cygiconv-2.dll => /usr/bin/cygiconv-2.dll (0x3d6e00000)
>
> --
> Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada


I just wanted to mention that I am having similar problems with graph as
the original poster (memory access error after loading cygiconv-2.dll).  I
am running Windows Defender as my only AV.  The problem persists after
turning that off though.

Tony Richardson