D20519.id58248.diff
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	Index: sys/kern/vfs_subr.c
	===================================================================
	--- sys/kern/vfs_subr.c
	+++ sys/kern/vfs_subr.c
	@@ -339,6 +339,54 @@
	SYSCTL_INT(_debug, OID_AUTO, vnlru_nowhere, CTLFLAG_RW,
	&vnlru_nowhere, 0, "Number of times the vnlru process ran without success");

	+#ifdef INVARIANTS
	+static int
	+sysctl_try_reclaim_vnode(SYSCTL_HANDLER_ARGS)
	+{
	+ struct vnode *vp;
	+ struct nameidata nd;
	+ char buf[PATH_MAX];
	+ int error;
	+
	+ if (req->newptr == NULL)
	+ return (EINVAL);
	+
	+ if (req->newlen > sizeof(buf))
	+ return (E2BIG);
	+
	+ error = SYSCTL_IN(req, buf, req->newlen);
	+ if (error != 0)
	+ return (error);
	+
	+ buf[req->newlen] = '\0';
	+
	+ NDINIT(&nd, LOOKUP,
	+ LOCKLEAF\| NOFOLLOW \| AUDITVNODE1 \| NOCACHE \| SAVENAME,
	+ UIO_SYSSPACE, buf, curthread);
	+ if ((error = namei(&nd)) != 0)
	+ return (error);
	+ vp = nd.ni_vp;
	+ NDFREE(&nd, NDF_NO_FREE_PNBUF \| NDF_NO_VP_UNLOCK \| NDF_NO_VP_RELE);
	+
	+ if (vp->v_usecount > 1 \|\| (vp->v_iflag & VI_DOOMED)) {
	+ vput(vp);
	+ return (EBUSY);
	+ }
	+
	+ vhold(vp);
	+ counter_u64_add(recycles_count, 1);
	+ vgone(vp);
	+ vdrop(vp);
	+ vput(vp);
	+
	+ return (0);
	+}
	+
	+SYSCTL_PROC(_debug, OID_AUTO, try_reclaim_vnode,
	+ CTLTYPE_STRING \| CTLFLAG_MPSAFE \| CTLFLAG_WR, NULL, 0,
	+ sysctl_try_reclaim_vnode, "A", "Try to reclaim a vnode by its pathname");
	+#endif /* INVARIANTS */
	+
	/* Shift count for (uintptr_t)vp to initialize vp->v_hash. */
	static int vnsz2log;