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Re: Ediff frequently crashes emacs.

From: Kim F. Storm
Subject: Re: Ediff frequently crashes emacs.
Date: Mon, 04 Apr 2005 13:01:08 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

Peter Seibel <address@hidden> writes:

> address@hidden (Kim F. Storm) writes:
>> What happens if you don't use byte-compiled ediff? Try adding this
>> to your .emacs and rerun the test:
>> (load "ediff-init.el")
>> (load "ediff-diff.el")
> So, by chance or not, it crashed almost right away after I started
> using ediff with those two lines in my .emacs.

Very odd!

> Program received signal SIGSEGV, Segmentation fault.
> x_catch_errors_unwind (old_val=137240633) at xterm.c:7514
> 7514    Display *dpy = XSAVE_VALUE (first)->pointer;
> (gdb) bt
> #0  x_catch_errors_unwind (old_val=137240633) at xterm.c:7514
> #1  0x08130317 in unbind_to (count=63, value=137240609) at eval.c:3146
> #2  0x08154749 in Fbyte_code (bytestr=135923915, vector=135924068, maxdepth=5)
>     at bytecode.c:885

This happens in 

     case Btemp_output_buffer_show:

which expects to unbind a binding created by a previous

     case Btemp_output_buffer_setup:

but finds something different on the binding stack.

>From the backtrace stack, I cannot see any reason why
either of with-output-to-temp-buffer or x_catch_errors
should be active, so this looks really odd.

Could be a byte-compiler error (but then I guess ediff
would never work), or a side-effect of memory trashing
like the other traps you have seen.  We "just" have to
identify what part of the code is trashing the memory.

> (gdb) xbacktrace
> "backquote-listify"
> "backquote-process"
> "backquote-process"
> "backquote-process"
> 0x81a04e4 PVEC_COMPILED
> "`"
> 0x8b65b35 Lisp type 5
> "ediff-get-difference"
> "aref"


I don't know where the "Lisp type 5" thing (a cons cell) came from
either, but this is quite deeply nested macros using backquote, so it
could be something I just don't understand...

Please continue to send traps.

Kim F. Storm <address@hidden> http://www.cua.dk

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