CVS commit: src/sys/kern

["Juergen Hannken-Illjes" <hannken%netbsd.org@localhost>]

Module Name:    src
Committed By:   hannken
Date:           Thu Nov 12 11:35:42 UTC 2015

Modified Files:
        src/sys/kern: vfs_vnode.c

Log Message:
Take the vnode lock before the vnode is marked VI_CHANGING and fed
to vclean().  Prevents a deadlock with two null mounts on the same
physical mount where one thread tries to vclean() a layer node and
another thread tries to vget() a layer node pointing to the same
physical node.

Fixes PR kern/50375 layerfs (nullfs) locking problem leading to livelock


To generate a diff of this commit:
cvs rdiff -u -r1.45 -r1.46 src/sys/kern/vfs_vnode.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.