----- Original Message -----
> > FYI: This (and similar s390x ARK selinux-testuite failures) is caused
> > by a BPF/BTF-related issue, presumably caused/exposed by the CI ARK
> > kernels being cross-compiled. It is being investigated.
>
> Thanks for the note, the LTP failures are also BPF related and started only
> recently as well, while BPF testcases haven't changed since March.
It does look like endian issue, presumably related to pahole (CC Arnaldo)
Only failing arch is s390, which is big endian.
struct btf_header {
__u16 magic;
__u8 version;
__u8 flags;
__u32 hdr_len;
...
CKI cross-compiled kernel:
# uname -r
5.7.0-0.rc6.1.cki.fc33.s390x
# hexdump -C /sys/kernel/btf/vmlinux | head -1
00000000 9f eb 01 00 18 00 00 00 00 00 00 00 a4 9f 18 00 |................|
Build from koji:
# uname -r
5.7.0-0.rc6.20200522git051143e1602d.1.fc33.s390x
# hexdump -C /sys/kernel/btf/vmlinux | head -1
00000000 eb 9f 01 00 00 00 00 18 00 00 00 00 00 18 35 ac |..............5.|
bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_SOCKET_FILTER, insn_cnt=1, insns=[{code=BPF_JMP|BPF_K|BPF_EXIT, dst_reg=BPF_REG_0, src_reg=BPF_REG_0, off=0, imm=0}], license="GP
L", log_level=7, log_size=8192, log_buf="", kern_version=KERNEL_VERSION(0, 0, 0), prog_flags=0, prog_name="", prog_ifindex=0, expected_attach_type=BPF_CGROUP_INET_INGRESS, prog_btf_fd=0, f
unc_info_rec_size=0, func_info=NULL, func_info_cnt=0, line_info_rec_size=0, line_info=NULL, line_info_cnt=0, attach_btf_id=0}, 112) = -1 EINVAL (Invalid argument)
Failed verification: in-kernel BTF is malformed
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