I'm getting the same symptoms as described in #16132. From `emacs -Q': M-x find-file RET c:\temp RET ... results in the Emacs Abort Dialogue and the backtrace below. When compiled with "-O0 -g3" or "-g3", the error doesn't occur. When compiled with CFLAGS not set, the backtrace isn't very helpful: (gdb) bt full #0 0x76e3321a in KERNELBASE!DeleteAce () from C:\Windows\syswow64\KernelBase.dll No symbol table info available. #1 0x0114ca82 in emacs_abort () at c:/emacs/trunk/src/w32fns.c:8443 button = #2 0x0109205c in terminate_due_to_signal (sig=sig@entry=11, backtrace_limit=backtrace_limit@entry=40) at c:/emacs/trunk/src/emacs.c:378 No locals. #3 0x010a7291 in handle_fatal_signal (sig=11) at c:/emacs/trunk/src/sysdep.c:1628 No locals. #4 deliver_thread_signal (sig=11, handler=) at c:/emacs/trunk/src/sysdep.c:1602 handler = 0x10a7172 #5 deliver_fatal_thread_signal (sig=11) at c:/emacs/trunk/src/sysdep.c:1640 No locals. #6 0x010011ea in _gnu_exception_handler@4 () No symbol table info available. #7 0x772ffffb in KERNEL32!GetQueuedCompletionStatus () from C:\Windows\syswow64\kernel32.dll No symbol table info available. #8 0x0088df18 in ?? () No symbol table info available. #9 0x779674ff in ntdll!AlpcMaxAllowedMessageLength () from C:\Windows\SysWOW64\ntdll.dll No symbol table info available. #10 0x0088df18 in ?? () No symbol table info available. #11 0x77929f45 in ntdll!RtlpNtSetValueKey () from C:\Windows\SysWOW64\ntdll.dll No symbol table info available. #12 0x011267be in sprintf (__stream=0x0, __format=0x1371be0 "Copying raw data for %.8s...", __format=0x1371be0 "Copying raw data for %.8s...") at c:/mingw/bin/../lib/gcc/mingw32/4.7.2/../../../../include/stdio.h:269 __retval = 6 __local_argv = 0x88ffec "" #13 0x7efde000 in ?? () No symbol table info available. #14 0x00000000 in ?? () No symbol table info available. (gdb) xbacktrace Undefined command: "xbacktrace". Try "help". (gdb) quit When started from the debugger things are no better (no stack pointer?). (The result is similar if "\temp" is specified as a command line argument.) C:\emacs>gdb --quiet --args c:\emacs\emacs-116232\bin\emacs.exe -Q Reading symbols from c:\emacs\emacs-116232\bin\emacs.exe...done. (gdb) run ;;; (Now type: M-x find-file RET \temp RET) Starting program: c:\emacs\emacs-116232\bin\emacs.exe -Q [New Thread 5320.0x1a6c] [New Thread 5320.0x1e6c] [New Thread 5320.0xa4c] [New Thread 5320.0x1f88] Program received signal SIGSEGV, Segmentation fault. 0x03b19605 in __register_frame_info () (gdb) thread apply all bt full Thread 4 (Thread 5320.0x1f88): #0 0x767078d7 in USER32!IsDialogMessage () from C:\Windows\syswow64\user32.dll No symbol table info available. #1 0x767078d7 in USER32!IsDialogMessage () from C:\Windows\syswow64\user32.dll No symbol table info available. #2 0x7670790d in USER32!GetCursorPos () from C:\Windows\syswow64\user32.dll No symbol table info available. #3 0x6ec1fe74 in ?? () No symbol table info available. #4 0x0114ff2c in w32_msg_pump (msg_buf=) at c:/emacs/trunk/src/w32fns.c:2449 msg = {hwnd = 0x22210f8, message = 1040, wParam = 0, lParam = 0, time = 185904691, pt = {x = 500, y = 705}} result = focus_window = #5 0x00000000 in ?? () No symbol table info available. Thread 3 (Thread 5320.0xa4c): #0 0x7790fd91 in ntdll!RtlFindSetBits () from C:\Windows\system32\ntdll.dll No symbol table info available. #1 0x7790fd91 in ntdll!RtlFindSetBits () from C:\Windows\system32\ntdll.dll No symbol table info available. #2 0x76e33bc8 in SleepEx () from C:\Windows\syswow64\KernelBase.dll No symbol table info available. #3 0x00000000 in ?? () No symbol table info available. Thread 2 (Thread 5320.0x1e6c): #0 0x7791015d in ntdll!RtlEnableEarlyCriticalSectionEventCreation () from C:\Windows\system32\ntdll.dll No symbol table info available. #1 0x7791015d in ntdll!RtlEnableEarlyCriticalSectionEventCreation () from C:\Windows\system32\ntdll.dll No symbol table info available. #2 0x77942f91 in ntdll!RtlWeaklyEnumerateEntryHashTable () from C:\Windows\system32\ntdll.dll No symbol table info available. #3 0x00000003 in ?? () No symbol table info available. #4 0x00cd1258 in ?? () No symbol table info available. #5 0x772c336a in KERNEL32!BaseCleanupAppcompatCacheSupport () from C:\Windows\syswow64\kernel32.dll No symbol table info available. #6 0x00000000 in ?? () No symbol table info available. Thread 1 (Thread 5320.0x1a6c): #0 0x03b19605 in __register_frame_info () No symbol table info available. Cannot access memory at address 0x6 (gdb) quit In GNU Emacs 24.3.50.1 (i686-pc-mingw32) of 2014-02-01 on 57172UHB Repository revision: 116232 eliz@gnu.org-20140201115310-cjn5tvleyejff9dy Windowing system distributor `Microsoft Corp.', version 6.1.7601 Configured using: `configure --prefix c:/emacs/emacs-116232 --enable-locallisppath=%emacs_dir%/../site-lisp 'CPPFLAGS=-I G:/usr/include -I C:/GnuWin32/include' 'LDFLAGS=-L G:/usr/lib -L C:/GnuWin32/lib'' Important settings: value of $LANG: ENG locale-coding-system: cp1252 Major mode: Lisp Interaction Minor modes in effect: tooltip-mode: t electric-indent-mode: t mouse-wheel-mode: t tool-bar-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t transient-mark-mode: t Recent input: M-x r - e - b Recent messages: For information about GNU Emacs and the GNU system, type C-h C-a. Load-path shadows: None found. Features: (shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml easymenu mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util help-fns mail-prsvr mail-utils time-date tooltip electric uniquify ediff-hook vc-hooks lisp-float-type mwheel dos-w32 ls-lisp w32-common-fns disp-table w32-win w32-vars tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment lisp-mode prog-mode register page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer nadvice loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote make-network-process w32notify w32 multi-tty emacs)