K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2020-04-20T14:45:17.978434Z
K 7
svn:log
V 484
Handle trashed queue pointers in vm_page_acquire_unlocked().

vm_page_acquire_unlocked() relies on type-stability of vm_page
structures and assumes that the listq linkage pointers always point to a
vm_page or are NULL.  QUEUE_MACRO_DEBUG_TRASH breaks that assumption, so
add an explicit check for a trashed queue pointer before dereferencing.

Reported and tested by:	pho
Reviewed by:	kib
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D24472

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