[Bug: 21.4.22] xemacs segfaults on sendmail-pre-abbrev-expand-hook

[Aidan Kehoe]

Hallo Andreas,

 Ar an deichiú lá de mí Márta, scríobh Andreas Goesele: 

 > When I start XEmacs, go to news (gnus), read some Email and then write
 > an email, then XEmacs very often segfaults. If I got in some way
 > around that first Email the problem disappears.

We need a C backtrace from this to be able to even guess what’s going on.
Next time it happens, send it on, would you? Even the Lisp backtrace might
help.

 > In the following case I clicked on some address offered by bbdb, but
 > the segfault also occurs, when I just expand in the header.
 > 
 > Here's a backtrace:

That backtrace (typically) isn’t from an XEmacs crash, it’s from XEmacs
detecting that there’s a problem on the Lisp level and that it’s giving up,
rather than going on and potentially crashing. 

 > Debugger entered--Lisp error: (invalid-function #<buffer "mail to Some One <one at some.where>">)
 >   #<buffer "mail to Some One <one at some.where>">()
 >   sendmail-pre-abbrev-expand-hook()
 >   expand-abbrev()
 >   bbdb-complete-name(#<marker at 84 in mail to Some One <one at some.where> 0xb5bf5f4>)
 >   bbdb-complete-clicked-name(#<buttonup-event button2up> #<extent (218, 255) H list-mode-item-user-data list-mode-item-activate-callback list-mode-item 0xa76efc0 in buffer *Completions*> (#<buffer "mail to Some One <one at some.where>"> #<marker at 84 in mail to Some One <one at some.where> 0xb5bf5f4> #<marker at 84 in mail to Some One <one at some.where> 0xb5bf5dc>))
 >   list-mode-item-selected-1(#<extent (218, 255) H list-mode-item-user-data list-mode-item-activate-callback list-mode-item 0xa76efc0 in buffer *Completions*> #<buttonup-event button2up>)
 >   mouse-choose-completion(#<buttonup-event button2up>)
 >   call-interactively(mouse-choose-completion)

Best,

Aidan

-- 
“Apart from the nine-banded armadillo, man is the only natural host of
Mycobacterium leprae, although it can be grown in the footpads of mice.”
  -- Kumar & Clark, Clinical Medicine, summarising improbable leprosy research