ubuntu_bpf:test_verifier 5 failures with 5.4 kernel on s390x cloud

Cycle: 2023.08.07
Series: focal:linux and bionic:hwe-5.4
Version: 5.4.0-162

Not a new regression, as seen last cycle (2023.07.10) on hwe-5.4 (5.4.0-156.173~18.04.1). It is the first time we have tested this on cloud. It fails only on s390x arch.

Tests that failed:

10:13:03 DEBUG| [stdout] #595/p ld_abs: vlan + abs, test 1 FAIL
10:13:03 DEBUG| [stdout] Failed to load prog 'Success'!
1

...

10:13:03 DEBUG| [stdout] #596/p ld_abs: vlan + abs, test 2 OK
10:13:03 DEBUG| [stdout] #597/p ld_abs: jump around ld_abs FAIL
10:13:03 DEBUG| [stdout] Failed to load prog 'Success'!

...

10:13:03 DEBUG| [stdout] #598/p ld_dw: xor semi-random 64 bit imms, test 1 OK
10:13:03 DEBUG| [stdout] #599/p ld_dw: xor semi-random 64 bit imms, test 2 OK
10:13:03 DEBUG| [stdout] #600/p ld_dw: xor semi-random 64 bit imms, test 3 OK
10:13:03 DEBUG| [stdout] #601/p ld_dw: xor semi-random 64 bit imms, test 4 OK
10:13:03 DEBUG| [stdout] #602/p ld_dw: xor semi-random 64 bit imms, test 5 FAIL

...

10:13:03 DEBUG| [stdout] #776/p runtime/jit: pass > 32bit index to tail_call OK
10:13:03 DEBUG| [stdout] #777/p scale: scale test 1 FAIL

...

10:13:04 DEBUG| [stdout] #778/p scale: scale test 2 FAIL

....
10:13:04 DEBUG| [stdout] Summary: 1608 PASSED, 0 SKIPPED, 5 FAILED

Full logs are attached