linux-kernel - test_bpf regressions on s390 since 5.4

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Date:   Thu, 16 Jul 2020 10:23:06 -0500
From:   seth.forshee@...onical.com
To:     Ilya Leoshkevich <iii@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: test_bpf regressions on s390 since 5.4

The tests in lib/test_bpf.c were all passing in 5.4 when using the JIT,
but some are failing in 5.7/5.8. Some of the failures are due to the
removal of BPF_SIZE_MAX causing some expected failures to pass, which I
have already send a patch for [1]. The remaining failures appear to be
regressions. I haven't tried 5.5 or 5.6, so I'm not sure exactly when
they first appeared.

These are the tests which currently fail:

 test_bpf: #37 INT: MUL_X jited:1 ret -1 != 1 FAIL (1 times)
 test_bpf: #42 INT: SUB jited:1 ret -55 != 11 FAIL (1 times)
 test_bpf: #44 INT: MUL jited:1 ret 439084800 != 903446258 FAIL (1 times)
 test_bpf: #49 INT: shifts by register jited:1 ret -617 != -1 FAIL (1 times)
 test_bpf: #371 JNE signed compare, test 1 jited:1 ret 2 != 1 FAIL (1 times)
 test_bpf: #372 JNE signed compare, test 2 jited:1 ret 2 != 1 FAIL (1 times)
 test_bpf: #374 JNE signed compare, test 4 jited:1 ret 1 != 2 FAIL (1 times)
 test_bpf: #375 JNE signed compare, test 5 jited:1 ret 2 != 1 FAIL (1 times)

Thanks,
Seth

[1] https://lore.kernel.org/lkml/20200716143931.330122-1-seth.forshee@canonical.com/