skip-syntax-backward dies while in ediff

If I do a find-function or C-h f in a highlighted ediff difference region I consistently get the following crash: Lisp backtrace follows: skip-syntax-backward("_w") # (unwind-protect ...) # (unwind-protect ...) # bind (stab) byte-code("..." [syntax-table stab ((set-syntax-table stab)) set-syntax-table copy-syntax-table emacs-lisp-mode-syntax-table zerop skip-syntax-backward "_w" ?w ?\_ forward-sexp -1 "`'" nil read obj fboundp] 4) # (condition-case ... . ((error))) function-at-point() # bind (variable-p) find-function-read() call-interactively(find-function) # (condition-case ... . error) # (catch top-level ...) GDB is free software and you are welcome to 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. GDB 4.16 (sparc-sun-solaris2.5), Copyright 1996 Free Software Foundation, Inc... Core was generated by `./src/xemacs'. Program terminated with signal 11, Segmentation fault. Reading symbols from /usr/dt/lib/libXm.so.3...done. Reading symbols from /local/misc/lib/libtiff.so...done. Reading symbols from /local/gnu/lib/libpng.so.2...done. Reading symbols from /local/kde/lib/libjpeg.so.6...done. Reading symbols from /local/gnu/lib/libz.so.1.0.4...done. Reading symbols from /local/xcontrib/lib/libXpm.so.4.9...done. Reading symbols from /usr/openwin/lib/libtt.so.2...done. Reading symbols from /usr/openwin/lib/libXmu.so.4...done. Reading symbols from /usr/openwin/lib/libXt.so.4...done. Reading symbols from /usr/openwin/lib/libXext.so.0...done. Reading symbols from /usr/openwin/lib/libX11.so.4...done. Reading symbols from /usr/lib/libdl.so.1...done. Reading symbols from /local/kde/lib/libgdbm.so.1...done. Reading symbols from /usr/lib/libintl.so.1...done. Reading symbols from /usr/lib/libkvm.so.1...done. Reading symbols from /usr/lib/libkstat.so.1...done. Reading symbols from /usr/lib/libm.so.1...done. Reading symbols from /usr/lib/libsocket.so.1...done. Reading symbols from /usr/lib/libnsl.so.1...done. Reading symbols from /usr/lib/libelf.so.1...done. Reading symbols from /usr/lib/libc.so.1...done. ---Type <return> to continue, or q <return> to quit--- Reading symbols from /usr/lib/libw.so.1...done. Reading symbols from /usr/lib/libmp.so.1...done. #0 0xef134424 in kill () (gdb) where #0 0xef134424 in kill () #1 0x6f600 in fatal_error_signal (sig=11) at emacs.c:262 #2 <signal handler called> #3 bufpos_to_bytind_func (buf=0xb, x=0) at insdel.c:581 #4 0x118c9c in skip_chars (buf=0x6e0400, forwardp=0, syntaxp=1, string=119, lim=1) at buffer.h:985 #5 0x1192c0 in Fskip_syntax_backward (syntax=1612745732, lim=-1607827452, buffer=-1607827452) at search.c:941 #6 0x76490 in funcall_recording_as (recorded_as=539374972, nargs=1, args=0xefffe3fc) at eval.c:3193 #7 0x767c8 in Ffuncall (nargs=2, args=0xefffe3fc) at eval.c:3238 #8 0x51ad8 in Fbyte_code (bytestr=1612745516, vector=-2145350752, maxdepth=16) at bytecode.c:416 #9 0x75f98 in Feval (form=1075874588) at eval.c:3063 #10 0x73e8c in condition_case_1 (handlers=1075874860, bfun=0x75850 <Feval>, barg=1075874588, hfun=0x73ed8 <run_condition_case_handlers>, harg=-1607827452) at eval.c:1653 #11 0x74014 in condition_case_3 (bodyform=1075874588, var=-1607827452, handlers=1075874860) at eval.c:1715 #12 0x51f98 in Fbyte_code (bytestr=1612745440, vector=-2145350908, maxdepth=4) at bytecode.c:576 #13 0x7734c in funcall_lambda (fun=539004112, nargs=0, arg_vector=0xefffecac) at eval.c:3597 #14 0x76774 in funcall_recording_as (recorded_as=539004112, nargs=0, args=0xefffeca8) at eval.c:3214 ---Type <return> to continue, or q <return> to quit--- #15 0x767c8 in Ffuncall (nargs=1, args=0xefffeca8) at eval.c:3238 #16 0x51ad8 in Fbyte_code (bytestr=1618751100, vector=-2139357184, maxdepth=8) at bytecode.c:416 #17 0x7734c in funcall_lambda (fun=545421228, nargs=0, arg_vector=0xefffee48) at eval.c:3597 #18 0x76fd0 in apply_lambda (fun=545421228, numargs=0, unevalled_args=-1607827452) at eval.c:3501 #19 0x76114 in Feval (form=1082971972) at eval.c:3085 #20 0x5334c in Fcall_interactively (function=-1606357932, record_flag=-1607827452, keys=-1607827452) at callint.c:339 #21 0x75160 in Fcommand_execute (cmd=-1606357932, record=-1607827452, keys=-1607827452) at eval.c:2584 #22 0xa9368 in execute_command_event (command_builder=0x407640, event=543770204) at event-stream.c:4346 #23 0xa9918 in Fdispatch_event (event=543770204) at event-stream.c:4637 #24 0x5ab54 in Fcommand_loop_1 () at cmdloop.c:579 #25 0x5a964 in command_loop_1 (dummy=-1607827452) at cmdloop.c:494 #26 0x73e8c in condition_case_1 (handlers=-1607827356, bfun=0x5a940 <command_loop_1>, barg=-1607827452, hfun=0x5a28c <cmd_error>, harg=-1607827452) at eval.c:1653 #27 0x5a3a0 in command_loop_3 () at cmdloop.c:256 #28 0x5a3c8 in command_loop_2 (dummy=-1607827452) at cmdloop.c:267 #29 0x73b24 in internal_catch (tag=-1607749532, func=0x5a3bc <command_loop_2>, arg=-1607827452, threw=0x0) at eval.c:1328 #30 0x5a5d0 in initial_command_loop (load_me=369596) at cmdloop.c:305 ---Type <return> to continue, or q <return> to quit--- #31 0x709dc in xemacs_21_0_sparc_sun_solaris2_5 (argc=1, argv=0xeffff92c, envp=0xeffff934, restart=2568036) at emacs.c:1702 #32 0x71120 in main (argc=0, argv=0xeffff92c, envp=0xeffff934) at emacs.c:2119