GNU bug report logs - #14479
[PATCH] Infinite loop when error in auto-save-hook

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Kelly Dean <kellydeanch <at> yahoo.com>
Subject: bug#14479: closed (Re: bug#14479: [PATCH] Infinite loop when
 error in auto-save-hook)
Date: Thu, 13 Jun 2013 05:14:03 +0000

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Your bug report

#14479: [PATCH] Infinite loop when error in auto-save-hook

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 14479 <at> debbugs.gnu.org.

-- 
14479: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=14479
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Glenn Morris <rgm <at> gnu.org>
To: 14479-done <at> debbugs.gnu.org
Subject: Re: bug#14479: [PATCH] Infinite loop when error in auto-save-hook
Date: Thu, 13 Jun 2013 01:13:36 -0400

Version: 24.4

Thanks; applied.

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From: Kelly Dean <kellydeanch <at> yahoo.com>
To: bug-gnu-emacs <at> gnu.org
Subject: [PATCH] Infinite loop when error in auto-save-hook
Date: Sun, 26 May 2013 18:21:32 -0700 (PDT)

Put in init.el:
(setq inhibit-startup-screen t)
(add-hook 'auto-save-hook (lambda () (error "Foo")))
(setq auto-save-interval 30)
(switch-to-buffer "*Messages*")

Start Emacs 24.3, then press any key 31 times. It prints "Foo" and begins benchmarking an autosave retry loop, on my system about 300 retries/second, because Fdo_auto_save fails when it tries to run auto-save-hook, so it never gets to record_auto_save which updates last_auto_save, which is what's supposed to prevent the retries via keyboard.c line 2608.

The patch below fixes it. Unlike the case for post-command-hook, removing the offending auto-save hook isn't vital, but I think it's the best thing to do. Anyway, continuing the autosave despite the error is vital, and safe_run_hooks is the easiest way to accomplish both.

--- emacs-24.3/src/fileio.c
+++ emacs-24.3/src/fileio.c
@@ -5445,7 +5445,7 @@
      point to non-strings reached from Vbuffer_alist.  */
 
   hook = intern ("auto-save-hook");
-  Frun_hooks (1, &hook);
+  safe_run_hooks (hook);
 
   if (STRINGP (Vauto_save_list_file_name))
     {

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