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bug#35784: emacs 26 crash

From: martin rudalics
Subject: bug#35784: emacs 26 crash
Date: Sat, 18 May 2019 19:30:50 +0200

>> #2  0x000000000061849e in die (msg=0x743f3f "BUFFERP (a)",
>> file=0x743f36 "buffer.h", line=914) at alloc.c:7406
>> #3  0x00000000005802b3 in XBUFFER (a=0) at buffer.h:914
>> #4  0x0000000000468bb3 in mark_window_display_accurate_1 (w=0x558e410,
>> accurate_p=false) at xdisp.c:14754
>>          b = 0x7ffe74b60e40
>> #5  0x0000000000468ffd in mark_window_display_accurate
>> (window=89711637, accurate_p=false) at xdisp.c:14811
>>          w = 0x558e410
>> #6  0x00000000004bbe06 in Fforce_window_update (object=89711637) at
>> window.c:3643
>>          w = 0x558e410
> This seems to imply that we are trying to update a non-leaf window,
> something that should never happen.  There's no Lisp-level backtrace,
> so it's hard to tell what Lisp called force-window-update, and how the
> window in question became non-leaf, but maybe some crazy Lisp hook
> switched windows behind redisplay's back or something.

I'd rather guess that this is the result of 'kill-buffer' called from
'delete-frame-functions' or 'delete-frame' called from
'kill-buffer-hook'.  But at the moment I can't reproduce the bug here
any more.


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