K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2019-11-11T20:44:30.977606Z
K 7
svn:log
V 604
Fix handling of PIPE_EOF in the direct write path.

Suppose a writing thread has pinned its pages and gone to sleep with
pipe_map.cnt > 0.  Suppose that the thread is woken up by a signal (so
error != 0) and the other end of the pipe has simultaneously been
closed.  In this case, to satisfy the assertion about pipe_map.cnt in
pipe_destroy_write_buffer(), we must mark the buffer as empty.

Reported by:	syzbot+5cce271bf2cb1b1e1876@syzkaller.appspotmail.com
Reviewed by:	kib
Tested by:	pho
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D22261

END