This crash bug also occurs when running under X11 on OS X -- it's not
related to Emacs.app. It cannot be triggered deterministically -- may
depend on where emacs resides in memory. However here is a test case
that reproduces reliably:
emacs -Q syntaxDecBoth.el (attached)
M-x show-paren-mode
C-M-x C-g C-_
repeat the last key sequence a few times to get the crash.
The C backtrace is similar to posted below, but the lisp backtrace differs:
"scan-sexps" (0xbfffbe08)
"byte-code" (0xbfffc0c4)
"show-paren-function" (0xbfffc9a8)
"apply" (0xbfffc9a4)
"byte-code" (0xbfffcc64)
"timer-event-handler" (0xbfffd42c)
It would be interesting to know if this can be reproduced on other systems.