Current CVS version (but my branch). I think I put the machine to sleep at that time and disconnected the external display. Another Emacs instance running at the same time did not crash, and I could not reproduce the problem. Process: Emacs [10576] Path: /Users/dr/Projects/Bazaar-Playground/emacs.cvs/ nextstep/Emacs.app/Contents/MacOS/Emacs Identifier: org.gnu.Emacs Version: Version 23.0.90 (9.0) Code Type: X86 (Native) Parent Process: launchd [227] Date/Time: 2009-03-02 19:30:12.660 -0500 OS Version: Mac OS X 10.5.6 (9G55) Report Version: 6 Exception Type: EXC_ARITHMETIC (SIGABRT) Exception Codes: EXC_I386_DIV (divide by zero) Crashed Thread: 0 Thread 0 Crashed: 0 libSystem.B.dylib 0x9019ce42 __kill + 10 1 libSystem.B.dylib 0x9020f23a raise + 26 2 libSystem.B.dylib 0x9021b679 abort + 73 3 org.gnu.Emacs 0x0016ca95 ns_term_shutdown + 117 (nsterm.m:4048) 4 org.gnu.Emacs 0x0009247f fatal_error_signal + 399 (emacs.c:389) 5 libSystem.B.dylib 0x9019b2bb _sigtramp + 43 6 ??? 0xffffffff 0 + 4294967295 7 libSystem.B.dylib 0x9020f23a raise + 26 8 libSystem.B.dylib 0x9021b679 abort + 73 9 org.gnu.Emacs 0x0010a6f5 Fsignal + 501 (eval.c: 1675) 10 org.gnu.Emacs 0x0010a818 xsignal + 24 (eval.c:1751) 11 org.gnu.Emacs 0x0010b414 xsignal0 + 36 (eval.c: 1760) 12 org.gnu.Emacs 0x000fa25e arith_error + 158 (data.c:3282) 13 libSystem.B.dylib 0x9019b2bb _sigtramp + 43 14 ??? 0xffffffff 0 + 4294967295 15 com.apple.AppKit 0x95306d85 -[NSView resizeWithOldSuperviewSize:] + 414 16 com.apple.AppKit 0x95306bc6 -[NSView resizeSubviewsWithOldSize:] + 177 17 com.apple.AppKit 0x95238d31 -[NSView setFrameSize:] + 658 18 com.apple.AppKit 0x95305381 -[NSWindow _oldPlaceWindow:] + 1573 19 com.apple.AppKit 0x95304a93 -[NSWindow _setFrameCommon:display:stashSize:] + 1569 20 com.apple.AppKit 0x9530446a -[NSWindow setFrame:display:] + 78 21 com.apple.AppKit 0x9530eb14 -[NSWindow _adjustWindowToScreen] + 1016 22 com.apple.AppKit 0x95531fcf -[NSWindow _displayChanged] + 77 23 com.apple.AppKit 0x9524c626 -[NSApplication makeWindowsPerform:inOrder:] + 418 24 com.apple.AppKit 0x95531ac8 -[NSApplication _reactToDisplayChanged:resetScreens:] + 117 25 com.apple.AppKit 0x952ead49 -[NSApplication sendEvent:] + 2941 26 org.gnu.Emacs 0x0016cc05 -[EmacsApp sendEvent:] + 165 (nsterm.m:4134) 27 com.apple.AppKit 0x9524869f -[NSApplication run] + 847 28 org.gnu.Emacs 0x0016acd3 ns_read_socket + 307 (nsterm.m:3235) 29 org.gnu.Emacs 0x0009e5f1 read_avail_input + 289 (keyboard.c:7076) 30 org.gnu.Emacs 0x0016b054 ns_select + 404 (nsterm.m:3303) 31 org.gnu.Emacs 0x0014f1b8 wait_reading_process_output + 1064 (process.c:4811) 32 org.gnu.Emacs 0x000a0389 read_char + 3593 (keyboard.c:4095) 33 org.gnu.Emacs 0x000a2764 read_key_sequence + 884 (keyboard.c:9432) 34 org.gnu.Emacs 0x000a4c8a command_loop_1 + 570 (keyboard.c:1640) 35 org.gnu.Emacs 0x0010826d internal_condition_case + 253 (eval.c:1511) 36 org.gnu.Emacs 0x00094728 command_loop_2 + 72 (keyboard.c:1358) 37 org.gnu.Emacs 0x0010814c internal_catch + 172 (eval.c:1247) 38 org.gnu.Emacs 0x0009441d command_loop + 77 (keyboard.c:1323) 39 org.gnu.Emacs 0x00094542 recursive_edit_1 + 146 (keyboard.c:951) 40 org.gnu.Emacs 0x000946c1 Frecursive_edit + 257 (keyboard.c:1014) 41 org.gnu.Emacs 0x0010a3d4 Ffuncall + 1156 (eval.c: 3041) 42 org.gnu.Emacs 0x0014552b Fbyte_code + 3835 (bytecode.c:678) 43 org.gnu.Emacs 0x00109736 Feval + 1062 (eval.c:2385) 44 org.gnu.Emacs 0x00109acf Fprogn + 63 (eval.c:450) 45 org.gnu.Emacs 0x0004ca4e Fsave_window_excursion + 78 (window.c:6552) 46 org.gnu.Emacs 0x00145e8b Fbyte_code + 6235 (bytecode.c:839) 47 org.gnu.Emacs 0x00109bd1 funcall_lambda + 209 (eval.c:3236) 48 org.gnu.Emacs 0x0010a11b Ffuncall + 459 (eval.c: 3101) 49 org.gnu.Emacs 0x0010bb35 Fapply + 245 (eval.c:2533) 50 org.gnu.Emacs 0x0010bc8d apply1 + 45 (eval.c:2798) 51 org.gnu.Emacs 0x00108e95 call_debugger + 341 (eval.c:311) 52 org.gnu.Emacs 0x00108fb8 maybe_call_debugger + 216 (eval.c:1901) 53 org.gnu.Emacs 0x0010913e find_handler_clause + 174 (eval.c:1965) 54 org.gnu.Emacs 0x0010a673 Fsignal + 371 (eval.c: 1703) 55 org.gnu.Emacs 0x0010a818 xsignal + 24 (eval.c:1751) 56 org.gnu.Emacs 0x0010ac30 error + 0 (eval.c:2017) 57 org.gnu.Emacs 0x000f5897 Fsymbol_value + 71 (data.c:1117) 58 org.gnu.Emacs 0x001095a1 Feval + 657 (eval.c:2448) 59 org.gnu.Emacs 0x0010a321 Ffuncall + 977 (eval.c: 3050) 60 org.gnu.Emacs 0x0014552b Fbyte_code + 3835 (bytecode.c:678) 61 org.gnu.Emacs 0x00109bd1 funcall_lambda + 209 (eval.c:3236) 62 org.gnu.Emacs 0x0010a11b Ffuncall + 459 (eval.c: 3101) 63 org.gnu.Emacs 0x0014552b Fbyte_code + 3835 (bytecode.c:678) 64 org.gnu.Emacs 0x00109bd1 funcall_lambda + 209 (eval.c:3236) 65 org.gnu.Emacs 0x0010a11b Ffuncall + 459 (eval.c: 3101) 66 org.gnu.Emacs 0x001064f2 Fcall_interactively + 3330 (callint.c:872) 67 org.gnu.Emacs 0x0010a321 Ffuncall + 977 (eval.c: 3050) 68 org.gnu.Emacs 0x0010a4d9 call3 + 25 (eval.c:2876) 69 org.gnu.Emacs 0x000a4ed1 command_loop_1 + 1153 (keyboard.c:1907) 70 org.gnu.Emacs 0x0010826d internal_condition_case + 253 (eval.c:1511) 71 org.gnu.Emacs 0x00094728 command_loop_2 + 72 (keyboard.c:1358) 72 org.gnu.Emacs 0x0010814c internal_catch + 172 (eval.c:1247) 73 org.gnu.Emacs 0x0009447e command_loop + 174 (keyboard.c:1337) 74 org.gnu.Emacs 0x00094542 recursive_edit_1 + 146 (keyboard.c:951) 75 org.gnu.Emacs 0x000946c1 Frecursive_edit + 257 (keyboard.c:1014) 76 org.gnu.Emacs 0x00093005 main + 2885 (emacs.c:1855) 77 org.gnu.Emacs 0x00002ff6 start + 54 Thread 1: 0 libSystem.B.dylib 0x901363ae __semwait_signal + 10 1 libSystem.B.dylib 0x90160d0d pthread_cond_wait $UNIX2003 + 73 2 com.apple.QuartzCore 0x93bf9ab9 fe_fragment_thread + 54 3 libSystem.B.dylib 0x90160095 _pthread_start + 321 4 libSystem.B.dylib 0x9015ff52 thread_start + 34 Thread 0 crashed with X86 Thread State (32-bit): eax: 0x00000000 ebx: 0x9021b639 ecx: 0xbfffce4c edx: 0x9019ce42 edi: 0x00000006 esi: 0x00000006 ebp: 0xbfffce68 esp: 0xbfffce4c ss: 0x0000001f efl: 0x00000286 eip: 0x9019ce42 cs: 0x00000007 ds: 0x0000001f es: 0x0000001f fs: 0x00000000 gs: 0x00000037 cr2: 0x0035c660