Merge tag 'v3.11-rc5' into for-3.12 branch

For testing purposes I want some nfs and nfsd bugfixes (specifically,
58cd57bfd9 and previous nfsd patches, and
Trond's 4f3cc4809a).

fs/nfsd/nfs4state.c

@@ -1259,6 +1259,8 @@ static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
 	struct svc_cred *cr = &rqstp->rq_cred;
 	u32 service;
 
+	if (!cr->cr_gss_mech)
+		return false;
 	service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
 	return service == RPC_GSS_SVC_INTEGRITY ||
 	       service == RPC_GSS_SVC_PRIVACY;