LTP: tirpc_rpcb_rmtcall is failing

[Petr Vorel <pvorel@suse.cz>]

Hi Steve,

tirpc_rpcb_rmtcall is failing. I was able to reproduce it on
* openSUSE Tumbleweed with libtirpc 1.3.3
* Debian stable  11 (bullseye) with libtirpc 1.3.1-1

OTOH SLE 15-SP4 with libtirpc 1.2.6 is working.

PATH="/opt/ltp/testcases/bin:$PATH" rpc_test.sh -s tirpc_svc_4 -c tirpc_rpcb_rmtcall
rpc_test 1 TINFO: initialize 'lhost' 'ltp_ns_veth2' interface
rpc_test 1 TINFO: add local addr 10.0.0.2/24
rpc_test 1 TINFO: add local addr fd00:1:1:1::2/64
rpc_test 1 TINFO: initialize 'rhost' 'ltp_ns_veth1' interface
rpc_test 1 TINFO: add remote addr 10.0.0.1/24
rpc_test 1 TINFO: add remote addr fd00:1:1:1::1/64
rpc_test 1 TINFO: Network config (local -- remote):
rpc_test 1 TINFO: ltp_ns_veth2 -- ltp_ns_veth1
rpc_test 1 TINFO: 10.0.0.2/24 -- 10.0.0.1/24
rpc_test 1 TINFO: fd00:1:1:1::2/64 -- fd00:1:1:1::1/64
rpc_test 1 TINFO: timeout per run is 0h 5m 0s
rpc_test 1 TINFO: check registered RPC with rpcinfo
rpc_test 1 TINFO: registered RPC:
   program vers proto   port  service
    100000    4   tcp    111  portmapper
    100000    3   tcp    111  portmapper
    100000    2   tcp    111  portmapper
    100000    4   udp    111  portmapper
    100000    3   udp    111  portmapper
    100000    2   udp    111  portmapper
    100005    1   udp  20048  mountd
    100005    1   tcp  20048  mountd
    100005    2   udp  20048  mountd
    100005    2   tcp  20048  mountd
    100005    3   udp  20048  mountd
    100005    3   tcp  20048  mountd
    100024    1   udp  37966  status
    100024    1   tcp  43643  status
    100003    3   tcp   2049  nfs
    100003    4   tcp   2049  nfs
    100227    3   tcp   2049  nfs_acl
    100021    1   udp  59603  nlockmgr
    100021    3   udp  59603  nlockmgr
    100021    4   udp  59603  nlockmgr
    100021    1   tcp  39145  nlockmgr
    100021    3   tcp  39145  nlockmgr
    100021    4   tcp  39145  nlockmgr
rpc_test 1 TINFO: using libtirpc: yes
rpc_test 1 TFAIL: tirpc_rpcb_rmtcall 10.0.0.2 536875000 failed unexpectedly
1

The problem is in tirpc_rpcb_rmtcall.c [1], which calls rpcb_rmtcall(), which
returns 1 (I suppose RPC_CANTENCODEARGS - can't encode arguments - enum
clnt_stat from tirpc/rpc/clnt_stat.h):

	cs = rpcb_rmtcall(nconf, argc[1], progNum, VERSNUM, PROCNUM,
			  (xdrproc_t) xdr_int, (char *)&var_snd,
			  (xdrproc_t) xdr_int, (char *)&var_rec, tv, &svcaddr);

	test_status = (cs == RPC_SUCCESS) ? 0 : 1;

	//This last printf gives the result status to the tests suite
	//normally should be 0: test has passed or 1: test has failed
	printf("%d\n", test_status);

	return test_status;

Any idea what could be wrong with these very old tests?

Kind regards,
Petr

[1] https://github.com/linux-test-project/ltp/blob/12765c115f11026c090ab0ee5dd79b38d95ef31f/testcases/network/rpc/rpc-tirpc/tests_pack/rpc_suite/tirpc/tirpc_expertlevel_rpcb_rmtcall/tirpc_rpcb_rmtcall.c#L91-L93