--- a/sys/vfs/procfs/procfs_vnops.c	2026-09-06 02:38:07.817579579 +0000
+++ b/sys/vfs/procfs/procfs_vnops.c	2026-09-06 02:38:07.817579579 +0000
@@ -796,7 +796,8 @@
 		}
 
 		pid = atopid(pname, cnp->cn_namelen);
-		if (pid == NO_PID)
+		/* pid 0 is the kernel-internal swapper: never addressable */
+		if (pid == NO_PID || pid == 0)
 			break;
 
 		p = pfs_pfind(pid);
@@ -1064,6 +1065,8 @@
 		break;
 
 	default:
+		if (p->p_pid == 0)	/* skip kernel-internal proc0 */
+			return(0);
 		if (!PRISON_CHECK(info->cred, p->p_ucred))
 			return(0);
 		if (ps_showallprocs == 0 &&