Re: "make tags" segfaults

[Francesco Potorti` <pot@gnu.org>]

   (gdb) run --include=TAGS-LISP --include=../lwlib/TAGS     --regex='/[  ]*DEFVAR_[A-Z_   (]+"\([^"]+\)"/'          /home-local/grossjoh/work/gnu/emacs/src/[xyzXYZ]*.[hc]  /home-local/grossjoh/work/gnu/emacs/src/[a-wA-W]*.[hc]
   Starting program: /home-local/grossjoh/work/gnu/emacs/lib-src/etags --include=TAGS-LISP --include=../lwlib/TAGS     --regex='/[  ]*DEFVAR_[A-Z_   (]+"\([^"]+\)"/'          /home-local/grossjoh/work/gnu/emacs/src/[xyzXYZ]*.[hc]  /home-local/grossjoh/work/gnu/emacs/src/[a-wA-W]*.[hc]
   
   Program received signal SIGSEGV, Segmentation fault.
   0x4008d219 in malloc () from /lib/libc.so.6
   (gdb) w
   Ambiguous command "w": watch, wh, whatis, where, while, while-stepping, winheight, ws.
   (gdb) where
   #0  0x4008d219 in malloc () from /lib/libc.so.6
   #1  0x4008d074 in malloc () from /lib/libc.so.6
   #2  0x0805042e in xmalloc (size=20)
       at /home-local/grossjoh/work/gnu/emacs/lib-src/etags.c:6602

This should mean that there has been memory corruption in the malloc
structures :-(

I cannot reproduce the bug, and none of my tests fail.  Moreover, I
cannot easily deduce where the memory corruption happens.  When
developing, I usually instrument etags with a small checkmalloc library.
If you can use a malloc checking library yourself, please try to do so
and report the results to me.

Else, I can send you the two source files needed for that library and
the small modifications to the Makefile for building and running etags
with malloc instrumentation.