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Re: reproducible segmentation fault on cygwin


From: emacs user
Subject: Re: reproducible segmentation fault on cygwin
Date: Wed, 12 Jan 2005 14:53:40 -0500



From: "Eli Zaretskii" <address@hidden>
Reply-To: Eli Zaretskii <address@hidden>
To: "emacs user" <address@hidden>
CC: address@hidden
Subject: Re: reproducible segmentation fault on cygwin
Date: Wed, 12 Jan 2005 08:41:40 +0200

> From: "emacs user" <address@hidden>
> Bcc:
> Date: Tue, 11 Jan 2005 15:03:33 -0500
>
> I find CVS gnu emacs on cygwin to be very unstable.  when I run it
> under the debugger there is a complained on segmentation fault,
> whatever that is...  here are the instructions for reproducing this
> error message:
>
> /usr/local/emacs/src $ gdb emacs
> GNU gdb 6.3.50_2004-12-28-cvs (cygwin-special)
> Copyright 2004 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"...
> DISPLAY = :0.0
> TERM = xterm
> Breakpoint 1 at 0x20099ea6: file emacs.c, line 454.
> Breakpoint 2 at 0x20074d08: file xterm.c, line 7790.
> (gdb) run -q --no-site-file
> Starting program: /usr/local/emacs/src/emacs.exe -q --no-site-file
> ---Type <return> to continue, or q <return> to quit---
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x7c809f62 in KERNEL32!IsBadWritePtr ()
>    from /cygdrive/c/WINDOWS/system32/kernel32.dll
> (gdb) quit

Please type "bt" at this point, instead of "quit", and post the
results.  Another GDB command, "xbacktrace", would also tell important
stuff, so please type that as well and post what it prints.

Thanks for reporting this.


/usr/local/emacs/src $ gdb emacs
GNU gdb 6.3.50_2004-12-28-cvs (cygwin-special)
Copyright 2004 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"...
DISPLAY = :0.0
TERM = xterm
Breakpoint 1 at 0x20099fd6: file emacs.c, line 454.
Breakpoint 2 at 0x20074e38: file xterm.c, line 7790.
(gdb) run -q --no-site-file
Starting program: /usr/local/emacs/src/emacs.exe -q --no-site-file
---Type <return> to continue, or q <return> to quit---

Program received signal SIGSEGV, Segmentation fault.
0x7c809f62 in KERNEL32!IsBadWritePtr ()
  from /cygdrive/c/WINDOWS/system32/kernel32.dll
(gdb) bt
#0  0x7c809f62 in KERNEL32!IsBadWritePtr ()
  from /cygdrive/c/WINDOWS/system32/kernel32.dll
#1  0x00000000 in ?? () from
(gdb) xbacktrace
0x0 Lisp type 0
Cannot access memory at address 0x14
(gdb)

note that if I type cont, emacs will actually start and work. but eventually it does crash fairly often.
I hope the above problem is related to the crashes as well.

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