Re: Recipe for disaster - reproducible crash

Paul> I managed to reproduce this with 21.4.6 and 21.5.4 under cygwin and 21.4.5 under Linux. Paul> quimby$ cat foo.el Paul> (let* ((buf (compile "make")) Paul> (proc (get-buffer-process buf))) Paul> (while (= 0 (process-exit-status proc)) Paul> (sleep-for 1)) Paul> (message "%s" (buffer-string buf))) Paul> quimby$ This does not happen in native Windows 2000 XEmacs. Evaluating the above in the scratch buffer of my running emacs-version "21.4 (patch 6) \"Common Lisp (Windows)\" XEmacs Lucid" does not crash it. Instead it hangs in the while loop. I can get out with C-g, which gives me (after setting debug-on-quit): Signaling: (quit) sleep-for(1) (while (= 0 (process-exit-status proc)) (sleep-for 1)) (let* ((buf ...) (proc ...)) (while (= 0 ...) (sleep-for 1)) (message "%s" (buffer-string buf))) eval((let* ((buf ...) (proc ...)) (while (= 0 ...) (sleep-for 1)) (message "%s" (buffer-string buf)))) eval-interactive((let* ((buf ...) (proc ...)) (while (= 0 ...) (sleep-for 1)) (message "%s" (buffer-string buf)))) eval-last-sexp(nil) call-interactively(eval-last-sexp) Paul> quimby$ Paul> quimby$ xemacs -vanilla -batch -load foo.el Paul> (No files need saving) Paul> Fatal error (11). Paul> Your files have been auto-saved. Paul> Use `M-x recover-session' to recover them. Paul> If you have access to the PROBLEMS file that came with your Paul> version of XEmacs, please check to see if your crash is described Paul> there, as there may be a workaround available. Paul> Otherwise, please report this bug by running the send-pr Paul> script included with XEmacs, or selecting `Send Bug Report' Paul> As a last resort send ordinary email to `crashes(a)xemacs.org&#39;. Paul> *MAKE SURE* to include the information in the command Paul> M-x describe-installation. Paul> If at all possible, *please* try to obtain a C stack backtrace; Paul> it will help us immensely in determining what went wrong. Paul> To do this, locate the core file that was produced as a result Paul> of this crash (it's usually called `core' and is located in the Paul> directory in which you started the editor, or maybe in your home Paul> directory), and type Paul> gdb /usr/local/bin/xemacs core Paul> then type `where' when the debugger prompt comes up. Paul> (If you don't have GDB on your system, you might have DBX, Paul> or XDB, or SDB. A similar procedure should work for all of Paul> these. Ask your system administrator if you need more help.) Paul> Lisp backtrace follows: Paul> pos-visible-in-window-p(152 #<window on "*compilation*" 0x2436>) Paul> # bind (buffer-read-only status) Paul> # (unwind-protect ...) Paul> # bind (obuf omax opoint estatus window buffer msg proc) Paul> compilation-sentinel(#<process "compilation" pid 3612 state:exit> "exited abnormally with code 2\n") Paul> # (condition-case ... . error) Paul> # bind (inhibit-quit) Paul> # (unwind-protect ...) Paul> # (unwind-protect ...) Paul> sleep-for(1) Paul> (while (= 0 (process-exit-status proc)) (sleep-for 1)) Paul> # bind (proc buf) Paul> (let* ((buf ...) (proc ...)) (while (= 0 ...) (sleep-for 1)) (message "%s" (buffer-string buf))) Paul> # bind (current-load-list) Paul> # (unwind-protect ...) Paul> # bind (load-file-name) Paul> # (unwind-protect ...) Paul> # (unwind-protect ...) Paul> # (unwind-protect ...) Paul> # (unwind-protect ...) Paul> # (unwind-protect ...) Paul> load-internal("/home/stodghil/foo.el" nil t nil undecided) Paul> # bind (path handler filename nosuffix nomessage noerror file) Paul> load("/home/stodghil/foo.el" nil t) Paul> # bind (file arg) Paul> command-line-do-load("-load") Paul> # bind (dir file-count line end-of-options file-p arg tem) Paul> command-line-1() Paul> # bind (command-line-args-left) Paul> command-line() Paul> # (unwind-protect ...) Paul> normal-top-level() Paul> # (condition-case ... . error) Paul> # (catch top-level ...) Paul> Segmentation fault Paul> quimby$ -- Adrian Aichner mailto:adrian＠xemacs.org http://www.xemacs.org/