test_maps fails consistently on x86-64 5.4.y (5.4.31 and defconfig + tools/testing/selftests/bpf/config in this case) and dumps this output:
~/linux/tools/testing/selftests/bpf$ sudo ./test_maps libbpf: Error loading BTF: Invalid argument(22) libbpf: magic: 0xeb9f version: 1 flags: 0x0 hdr_len: 24 type_off: 0 type_len: 780 str_off: 780 str_len: 854 btf_total_size: 1658 [1] PTR (anon) type_id=2 [2] STRUCT __sk_buff size=176 vlen=31 len type_id=3 bits_offset=0 pkt_type type_id=3 bits_offset=32 mark type_id=3 bits_offset=64 queue_mapping type_id=3 bits_offset=96 protocol type_id=3 bits_offset=128 vlan_present type_id=3 bits_offset=160 vlan_tci type_id=3 bits_offset=192 vlan_proto type_id=3 bits_offset=224 priority type_id=3 bits_offset=256 ingress_ifindex type_id=3 bits_offset=288 ifindex type_id=3 bits_offset=320 tc_index type_id=3 bits_offset=352 cb type_id=5 bits_offset=384 hash type_id=3 bits_offset=544 tc_classid type_id=3 bits_offset=576 data type_id=3 bits_offset=608 data_end type_id=3 bits_offset=640 napi_id type_id=3 bits_offset=672 family type_id=3 bits_offset=704 remote_ip4 type_id=3 bits_offset=736 local_ip4 type_id=3 bits_offset=768 remote_ip6 type_id=7 bits_offset=800 local_ip6 type_id=7 bits_offset=928 remote_port type_id=3 bits_offset=1056 local_port type_id=3 bits_offset=1088 data_meta type_id=3 bits_offset=1120 (anon) type_id=8 bits_offset=1152 tstamp type_id=10 bits_offset=1216 wire_len type_id=3 bits_offset=1280 gso_segs type_id=3 bits_offset=1312 (anon) type_id=12 bits_offset=1344 [3] TYPEDEF __u32 type_id=4 [4] INT unsigned int size=4 bits_offset=0 nr_bits=32 encoding=(none) [5] ARRAY (anon) type_id=3 index_type_id=6 nr_elems=5 [6] INT __ARRAY_SIZE_TYPE__ size=4 bits_offset=0 nr_bits=32 encoding=(none) [7] ARRAY (anon) type_id=3 index_type_id=6 nr_elems=4 [8] UNION (anon) size=8 vlen=1 flow_keys type_id=9 bits_offset=0 [9] PTR (anon) type_id=23 [10] TYPEDEF __u64 type_id=11 [11] INT long long unsigned int size=8 bits_offset=0 nr_bits=64 encoding=(none) [12] UNION (anon) size=8 vlen=1 sk type_id=13 bits_offset=0 [13] PTR (anon) type_id=24 [14] FUNC_PROTO (anon) return=15 args=(1 skb) [15] INT int size=4 bits_offset=0 nr_bits=32 encoding=SIGNED [16] FUNC bpf_prog1 type_id=14 vlen != 0
libbpf: Error loading .BTF into kernel: -22. libbpf: Error loading BTF: Invalid argument(22) libbpf: magic: 0xeb9f version: 1 flags: 0x0 hdr_len: 24 type_off: 0 type_len: 440 str_off: 440 str_len: 564 btf_total_size: 1028 [1] PTR (anon) type_id=2 [2] STRUCT sk_msg_md size=72 vlen=10 (anon) type_id=3 bits_offset=0 (anon) type_id=5 bits_offset=64 family type_id=6 bits_offset=128 remote_ip4 type_id=6 bits_offset=160 local_ip4 type_id=6 bits_offset=192 remote_ip6 type_id=8 bits_offset=224 local_ip6 type_id=8 bits_offset=352 remote_port type_id=6 bits_offset=480 local_port type_id=6 bits_offset=512 size type_id=6 bits_offset=544 [3] UNION (anon) size=8 vlen=1 data type_id=4 bits_offset=0 [4] PTR (anon) type_id=0 [5] UNION (anon) size=8 vlen=1 data_end type_id=4 bits_offset=0 [6] TYPEDEF __u32 type_id=7 [7] INT unsigned int size=4 bits_offset=0 nr_bits=32 encoding=(none) [8] ARRAY (anon) type_id=6 index_type_id=9 nr_elems=4 [9] INT __ARRAY_SIZE_TYPE__ size=4 bits_offset=0 nr_bits=32 encoding=(none) [10] FUNC_PROTO (anon) return=11 args=(1 msg) [11] INT int size=4 bits_offset=0 nr_bits=32 encoding=SIGNED [12] FUNC bpf_prog1 type_id=10 vlen != 0
libbpf: Error loading .BTF into kernel: -22. libbpf: Error loading BTF: Invalid argument(22) libbpf: magic: 0xeb9f version: 1 flags: 0x0 hdr_len: 24 type_off: 0 type_len: 1300 str_off: 1300 str_len: 907 btf_total_size: 2231 [1] STRUCT (anon) size=32 vlen=4 type type_id=2 bits_offset=0 max_entries type_id=6 bits_offset=64 key_size type_id=8 bits_offset=128 value_size type_id=8 bits_offset=192 [2] PTR (anon) type_id=4 [3] INT int size=4 bits_offset=0 nr_bits=32 encoding=SIGNED [4] ARRAY (anon) type_id=3 index_type_id=5 nr_elems=15 [5] INT __ARRAY_SIZE_TYPE__ size=4 bits_offset=0 nr_bits=32 encoding=(none) [6] PTR (anon) type_id=7 [7] ARRAY (anon) type_id=3 index_type_id=5 nr_elems=20 [8] PTR (anon) type_id=9 [9] ARRAY (anon) type_id=3 index_type_id=5 nr_elems=4 [10] VAR sock_map_rx type_id=1 linkage=1 [11] STRUCT (anon) size=32 vlen=4 type type_id=2 bits_offset=0 max_entries type_id=6 bits_offset=64 key_size type_id=8 bits_offset=128 value_size type_id=8 bits_offset=192 [12] VAR sock_map_tx type_id=11 linkage=1 [13] STRUCT (anon) size=32 vlen=4 type type_id=2 bits_offset=0 max_entries type_id=6 bits_offset=64 key_size type_id=8 bits_offset=128 value_size type_id=8 bits_offset=192 [14] VAR sock_map_msg type_id=13 linkage=1 [15] STRUCT (anon) size=32 vlen=4 type type_id=16 bits_offset=0 max_entries type_id=6 bits_offset=64 key type_id=18 bits_offset=128 value type_id=18 bits_offset=192 [16] PTR (anon) type_id=17 [17] ARRAY (anon) type_id=3 index_type_id=5 nr_elems=2 [18] PTR (anon) type_id=3 [19] VAR sock_map_break type_id=15 linkage=1 [20] PTR (anon) type_id=21 [21] STRUCT __sk_buff size=176 vlen=31 len type_id=22 bits_offset=0 pkt_type type_id=22 bits_offset=32 mark type_id=22 bits_offset=64 queue_mapping type_id=22 bits_offset=96 protocol type_id=22 bits_offset=128 vlan_present type_id=22 bits_offset=160 vlan_tci type_id=22 bits_offset=192 vlan_proto type_id=22 bits_offset=224 priority type_id=22 bits_offset=256 ingress_ifindex type_id=22 bits_offset=288 ifindex type_id=22 bits_offset=320 tc_index type_id=22 bits_offset=352 cb type_id=24 bits_offset=384 hash type_id=22 bits_offset=544 tc_classid type_id=22 bits_offset=576 data type_id=22 bits_offset=608 data_end type_id=22 bits_offset=640 napi_id type_id=22 bits_offset=672 family type_id=22 bits_offset=704 remote_ip4 type_id=22 bits_offset=736 local_ip4 type_id=22 bits_offset=768 remote_ip6 type_id=25 bits_offset=800 local_ip6 type_id=25 bits_offset=928 remote_port type_id=22 bits_offset=1056 local_port type_id=22 bits_offset=1088 data_meta type_id=22 bits_offset=1120 (anon) type_id=26 bits_offset=1152 tstamp type_id=28 bits_offset=1216 wire_len type_id=22 bits_offset=1280 gso_segs type_id=22 bits_offset=1312 (anon) type_id=30 bits_offset=1344 [22] TYPEDEF __u32 type_id=23 [23] INT unsigned int size=4 bits_offset=0 nr_bits=32 encoding=(none) [24] ARRAY (anon) type_id=22 index_type_id=5 nr_elems=5 [25] ARRAY (anon) type_id=22 index_type_id=5 nr_elems=4 [26] UNION (anon) size=8 vlen=1 flow_keys type_id=27 bits_offset=0 [27] PTR (anon) type_id=41 [28] TYPEDEF __u64 type_id=29 [29] INT long long unsigned int size=8 bits_offset=0 nr_bits=64 encoding=(none) [30] UNION (anon) size=8 vlen=1 sk type_id=31 bits_offset=0 [31] PTR (anon) type_id=42 [32] FUNC_PROTO (anon) return=3 args=(20 skb) [33] FUNC bpf_prog2 type_id=32 vlen != 0
libbpf: Error loading .BTF into kernel: -22. Failed to load SK_SKB verdict prog
~/linux/tools/testing/selftests/bpf$ find . -name sockmap_*prog.o ./sockmap_verdict_prog.o ./sockmap_tcp_msg_prog.o ./alu32/sockmap_verdict_prog.o ./alu32/sockmap_tcp_msg_prog.o ./alu32/sockmap_parse_prog.o ./sockmap_parse_prog.o
$ dpkg -l | grep clang ii clang 1:10.0-50~exp1 amd64 C, C++ and Objective-C compiler (LLVM based) ii clang-10 1:10.0.0-2ubuntu2 amd64 C, C++ and Objective-C compiler ii libclang-common-10-dev 1:10.0.0-2ubuntu2 amd64 Clang library - Common development package ii libclang-cpp10 1:10.0.0-2ubuntu2 amd64 C++ interface to the Clang library ii libclang1-10 1:10.0.0-2ubuntu2 amd64 C interface to the Clang library
Full log of "TARGETS=bpf run_tests" is available here: https://paste.ubuntu.com/p/MTkWD63Zgc/