Subject: bug#14666: 24.3.50; emacs_backtrace.txt

From: martin rudalics <[email-masked]>
Date: Wed, 19 Jun 2013 19:44:16 +0200

>> The only explanation is that another thread modified w->contents after
 >> it was tested with BUFFERP.
 >
 > Should that be possible?

Not really.  w->contents can be only set to another buffer which would
still pass the assertion.  Hence any such "modification" would mean that
the window got collected in between the two checks.

martin