Index: sys/kern/imgact_elf.c
===================================================================
RCS file: /home/dcvs/src/sys/kern/imgact_elf.c,v
retrieving revision 1.12
diff -u -b -B -r1.12 imgact_elf.c
--- sys/kern/imgact_elf.c	20 Oct 2003 06:50:51 -0000	1.12
+++ sys/kern/imgact_elf.c	9 Nov 2003 19:32:57 -0000
@@ -1247,12 +1247,19 @@
 		if (fp->f_type != DTYPE_VNODE)
 			continue;
 		if (dst) {
+			vp = (struct vnode *)fp->f_data;
+			/* it looks like a bug in ptrace is marking 
+			 * a non-vnode as a vnode - until we find the 
+			 * root cause this will at least prevent
+			 * further panics from truss
+			 */
+			if (vp == NULL || vp->v_mount == NULL)
+			        continue;
 			cfh->cfh_nfiles++;
 			cfi = (struct ckpt_fileinfo *)((char *)dst + *off);
 			cfi->cfi_index = i;
 			cfi->cfi_flags = fp->f_flag;
 			cfi->cfi_offset = fp->f_offset;
-			vp = (struct vnode *)fp->f_data;
 			cfi->cfi_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
 			error = VFS_VPTOFH(vp, &cfi->cfi_fh.fh_fid);
 		}