D21518.diff
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	Index: head/sys/fs/pseudofs/pseudofs_vnops.c
	===================================================================
	--- head/sys/fs/pseudofs/pseudofs_vnops.c
	+++ head/sys/fs/pseudofs/pseudofs_vnops.c
	@@ -809,23 +809,28 @@
	if (resid == 0)
	PFS_RETURN (0);

	- if (!pfs_lookup_proc(pid, &proc))
	+ proc = NULL;
	+ if (pid != NO_PID && !pfs_lookup_proc(pid, &proc))
	PFS_RETURN (ENOENT);

	sx_slock(&allproc_lock);
	pfs_lock(pd);
	- PROC_LOCK(proc);

	- /* check if the directory is visible to the caller */
	- if (!pfs_visible_proc(curthread, pd, proc)) {
	- _PRELE(proc);
	- PROC_UNLOCK(proc);
	- sx_sunlock(&allproc_lock);
	- pfs_unlock(pd);
	- PFS_RETURN (ENOENT);
	- }
	KASSERT(pid == NO_PID \|\| proc != NULL,
	("%s(): no process for pid %lu", __func__, (unsigned long)pid));
	+
	+ if (pid != NO_PID) {
	+ PROC_LOCK(proc);
	+
	+ /* check if the directory is visible to the caller */
	+ if (!pfs_visible_proc(curthread, pd, proc)) {
	+ _PRELE(proc);
	+ PROC_UNLOCK(proc);
	+ sx_sunlock(&allproc_lock);
	+ pfs_unlock(pd);
	+ PFS_RETURN (ENOENT);
	+ }
	+ }

	/* skip unwanted entries */
	for (pn = NULL, p = NULL; offset > 0; offset -= PFS_DELEN) {