bug#7116: 24.0.50; Assertion failure in process.c

[Johan Bockgård]

I've seen this bug three times more recently when doing `M-x
man',  `C-x v l', or `nothing in particular'.

GNU Emacs 24.0.50.12 (x86_64-unknown-linux-gnu, GTK+ Version 2.22.0) of
2010-12-16 on muon

#0  0x00007f1ee0480e87 in kill () at ../sysdeps/unix/syscall-template.S:82
#1  0x000000000056cc80 in fatal_error_signal (sig=<value optimized out>)
    at emacs.c:397
#2  <signal handler called>
#3  0x00007f1ee0480e87 in kill () at ../sysdeps/unix/syscall-template.S:82
#4  0x000000000056ae45 in abort () at emacs.c:426
#5  0x00000000005e921a in die (msg=<value optimized out>, 
    file=<value optimized out>, line=<value optimized out>) at alloc.c:6130
#6  0x0000000000665071 in status_notify (deleting_process=0x0)
    at process.c:6667
...


(gdb) f 6
#6  0x0000000000665071 in status_notify (deleting_process=0x0)
    at process.c:6667
6667          p = XPROCESS (proc);

  ----------------
  for (tail = Vprocess_alist; CONSP (tail); tail = XCDR (tail))
    {
      Lisp_Object symbol;
      register struct Lisp_Process *p;

      proc = Fcdr (XCAR (tail));        <<<<<<<<  nil
      p = XPROCESS (proc);
  ----------------

(gdb) p Qnil == proc
$1 = 1
(gdb) p Qnil == Vprocess_alist
$2 = 1

How can this happen?