Re: Emacs-24.3 crash when browse-url

[Thierry Volpiatto <thierry.volpiatto@gmail.com>]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>>>> Debugger entered--Lisp error: (error "binding stack not balanced (serious byte compiler bug)")
>>>> browse-url-xdg-open("http://www.google.fr" nil)
>>> M-x disassemble RET browse-url-xdg-open RET
>> --8<---------------cut here---------------start------------->8---
>> byte code for browse-url-xdg-open:
>>   doc:  Pass the specified URL to the "xdg-open" command. ...
>>   args: (url &optional ignored)
>>  interactive: (browse-url-interactive-arg "URL: ")
>> 0	constant  call-process
>> 1	constant  "xdg-open"
>> 2	constant  nil
>> 3	constant  0
>> 4	constant  nil
>> 5	varref	  url
>> 6	call	  5
>> 7	return	  
>> --8<---------------cut here---------------end--------------->8---
>
> Hmm... "binding stack not balanced (serious byte compiler bug)" means
> that the specpdl stack (the stack of things that need to be unwound,
> such as unwind-protects and dynamic let bindings) does not have the same
> height at the end of (presumably) browse-url-xdg-open as it had at
> the beginning.  But as we see above, browse-url-xdg-open does not push
> nor pop anything to/from that stack (it does push constants onto the
> bytecode's execution stack, but that's a completely different stack).
Thanks for explanation.

> So, the specpdl stack was somehow messed up, presumably during the
> execution of browse-url-xdg-open but apparently not by the byte code of
> browse-url-xdg-open.  It could be a problem in `call-process'.

Ok, here the last working revision:

--8<---------------cut here---------------start------------->8---
changeset:   123952:4d87702c495a
user:        Paul Eggert <eggert@cs.ucla.edu>
date:        Mon Dec 03 13:07:47 2012 -0800
summary:     * bytecode.c, lisp.h (Qbytecode): Remove.
--8<---------------cut here---------------end--------------->8---

And the crash reappear when I compile from here:

--8<---------------cut here---------------start------------->8---
changeset:   123953:342630a53fea
user:        Paul Eggert <eggert@cs.ucla.edu>
date:        Mon Dec 03 13:42:12 2012 -0800
summary:     Don't let call-process be a zombie factory.
--8<---------------cut here---------------end--------------->8---

Hope that help.

-- 
  Thierry
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