On Wed, 2 Jun 2004, Wirawan Purwanto wrote:
> Hi, the new cygwin1.dll has caused a problem with gnuplot. Here are the
> version numbers (obtained via "cygcheck" command):
>
> cygwin 1.5.10-3
> gnuplot 3.8j.0-1
>
> What happens is that if you run the plot script (supplied in the
> attachment), the gnuplot program would just be stuck. Even pressing ^C
> doesn't stop the process (seems like all the keyboard is stuck). All I can
> do is to kill the gnuplot process from other cygwin window (or from Task
> Manager). I'm running cygwin under Windows 2000 SP 4 (build 2195).
>
> I'm not sure what kind of condition would trigger the problem. I
> haven't reduced the plot to see the exact cause of the "hang". The same
> script (offending3.plt), run in GNUPLOT version 3.7.2 under Red Hat Linux
> 8, does not cause this problem. Since this "hang" didn't happen with the
> previous version of cygwin1.dll, I report this as a cygwin bug first, to
> see if that's indeed the case. It may as well that this is gnuplot bug
> also.
>
> I tried to debug the program with gdb, here's the result:
>
> /d/temp $ gdb /usr/bin/gnuplot
> GNU gdb 2003-09-20-cvs (cygwin-special)
> Copyright 2003 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB. Type "show warranty" for
> details.
> This GDB was configured as "i686-pc-cygwin"...(no debugging symbols
> found)...
> (gdb) set args offending3.plt
> (gdb) run
> Starting program: /usr/bin/gnuplot.exe offending3.plt
> ---Type <return> to continue, or q <return> to quit---
> Showing multiplot
>
> Program received signal SIGSEGV, Segmentation fault.
> ---Type <return> to continue, or q <return> to quit---
> 0x7c5746b9 in KERNEL32!IsBadWritePtr () from /c/WINNT/system32/KERNEL32.DLL
> (gdb) where
> #0 0x7c5746b9 in KERNEL32!IsBadWritePtr () from /c/WINNT/system32/KERNEL32.DLL
^^^^^^^^^^^^^^^^^^^^^^
This isn't your hang. See
<http://cygwin.com/ml/cygwin/2004-06/msg00057.html>.
HTH,
Igor
> #1 0x610a92ed in cygwin1!__getreent () from /usr/bin/cygwin1.dll
> #2 0x00000008 in ?? ()
> #3 0x0022d588 in ?? ()
> #4 0x610a9387 in cygwin1!__getreent () from /usr/bin/cygwin1.dll
> (gdb)
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