detect a suspected vget race with getnewvnode (and panic)

SCCS-vsn: sys/kern/vfs_subr.c 8.10

diff --git a/usr/src/sys/kern/vfs_subr.c b/usr/src/sys/kern/vfs_subr.c
index 3da8bcf..ea5fe66 100644 (file)
--- a/usr/src/sys/kern/vfs_subr.c
+++ b/usr/src/sys/kern/vfs_subr.c
@@ -9,7 +9,7 @@
  *
  * %sccs.include.redist.c%
  *
  *
  * %sccs.include.redist.c%
  *

- *     @(#)vfs_subr.c  8.9 (Berkeley) %G%
+ *     @(#)vfs_subr.c  8.10 (Berkeley) %G%

  */
 
 /*
  */
 
 /*


@@ -590,6 +590,7 @@ vget(vp, lockflag)
                    vp->v_freelist.tqe_prev == (struct vnode **)0xdeadb)
                        panic("vget: not on queue");
                TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
                    vp->v_freelist.tqe_prev == (struct vnode **)0xdeadb)
                        panic("vget: not on queue");
                TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);

+       }

                vp->v_freelist.tqe_next = (struct vnode *)0xdeadf;
                vp->v_freelist.tqe_prev = (struct vnode **)0xdeadb;
        }
                vp->v_freelist.tqe_next = (struct vnode *)0xdeadf;
                vp->v_freelist.tqe_prev = (struct vnode **)0xdeadb;
        }