diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index e75872f81e1c43c103e1300880aa062eef0b69f1..41d2aed8ed061b542c4188fb9e21877a5a9ec0a0 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -190,7 +190,7 @@ static struct list_head file_hashtbl[FILE_HASH_SIZE];
 
 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
 {
-	BUG_ON(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
+	WARN_ON_ONCE(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
 	atomic_inc(&fp->fi_access[oflag]);
 }
 
@@ -249,7 +249,7 @@ static inline int get_new_stid(struct nfs4_stid *stid)
 	 * preallocations that can exist at a time, but the state lock
 	 * prevents anyone from using ours before we get here:
 	 */
-	BUG_ON(error);
+	WARN_ON_ONCE(error);
 	/*
 	 * It shouldn't be a problem to reuse an opaque stateid value.
 	 * I don't think it is for 4.1.  But with 4.0 I worry that, for
@@ -494,7 +494,8 @@ static int nfs4_access_to_omode(u32 access)
 	case NFS4_SHARE_ACCESS_BOTH:
 		return O_RDWR;
 	}
-	BUG();
+	WARN_ON_ONCE(1);
+	return O_RDONLY;
 }
 
 /* release all access and file references for a given stateid */
@@ -1605,10 +1606,9 @@ nfsd4_exchange_id(struct svc_rqst *rqstp,
 	switch (exid->spa_how) {
 	case SP4_NONE:
 		break;
+	default:				/* checked by xdr code */
+		WARN_ON_ONCE(1);
 	case SP4_SSV:
-		return nfserr_serverfault;
-	default:
-		BUG();				/* checked by xdr code */
 	case SP4_MACH_CRED:
 		return nfserr_serverfault;	/* no excuse :-/ */
 	}
@@ -2912,7 +2912,7 @@ static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
 			open->op_why_no_deleg = WND4_CANCELLED;
 			break;
 		case NFS4_SHARE_WANT_NO_DELEG:
-			BUG();	/* not supposed to get here */
+			WARN_ON_ONCE(1);
 		}
 	}
 }
@@ -3466,7 +3466,11 @@ nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
 			goto out;
 		if (filpp) {
 			*filpp = dp->dl_file->fi_deleg_file;
-			BUG_ON(!*filpp);
+			if (!*filpp) {
+				WARN_ON_ONCE(1);
+				status = nfserr_serverfault;
+				goto out;
+			}
 		}
 		break;
 	case NFS4_OPEN_STID:
@@ -3693,7 +3697,7 @@ static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_ac
 	case NFS4_SHARE_ACCESS_BOTH:
 		break;
 	default:
-		BUG();
+		WARN_ON_ONCE(1);
 	}
 }
 
@@ -3882,7 +3886,7 @@ last_byte_offset(u64 start, u64 len)
 {
 	u64 end;
 
-	BUG_ON(!len);
+	WARN_ON_ONCE(!len);
 	end = start + len;
 	return end > start ? end - 1: NFS4_MAX_UINT64;
 }
@@ -4552,7 +4556,7 @@ nfs4_release_reclaim(struct nfsd_net *nn)
 			nfs4_remove_reclaim_record(crp, nn);
 		}
 	}
-	BUG_ON(nn->reclaim_str_hashtbl_size);
+	WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
 }
 
 /*