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    SubjectRe: selftests: Linux Kernel Dump Test Module output
    On Mon, Feb 17, 2020 at 04:39:37PM +0530, Naresh Kamboju wrote:
    > The selftest lkdtm test failed on x86_64 and arm64.
    > am I missing any pre-requisite?
    > [...]
    > ref:
    > https://qa-reports.linaro.org/lkft/linux-mainline-oe/build/v5.6-rc1-19-g359c92c02bfa/testrun/1212254/log

    Looking at this, I see debugfs mounted, I see LKDTM enabled, but I see
    the console freak out just as lkdtm starts:

    [ 349.262263] kselftest: Running tests in lkdtm
    # 4 0x0000000000401014 ?? ??0
    0x0000000000401014: ??_??0 #
    # 5 0x00007f9de1221a56 ?? ??0
    0x00007f9de1221a56: ??_??0 #
    # 6 0x0000000000401399 ?? ??0
    0x0000000000401399: ??_??0 #
    # madvise failed,
    failed,: _ #
    # addr 0x7f9de1000000
    0x7f9de1000000: _ #
    # length 0x200000
    0x200000: _ #
    # src_type 0
    0: _ #
    # Testing guest mode PA-bitsANY, VA-bits48, 4K pages
    guest: mode_PA-bitsANY, #
    # Guest physical address width detected 39
    physical: address_width #
    [FAIL] 11 selftests kvm vmx_dirty_log_test # exit=254

    Is a kvm test running at the same time? It just looks like the entire
    console goes silent (which would certainly make the lkdtm tests fail)

    > https://qa-reports.linaro.org/lkft/linux-mainline-oe/build/v5.5-11440-gd1ea35f4cdd4/testrun/1202720/log

    Similar happens here, only this time it seems to be gpio tests?

    [ 363.276824] kselftest: Running tests in lkdtm
    # ./gpio-mockup.sh line 89 ./gpio-mockup-chardev No such file or
    # directory
    line: 89_./gpio-mockup-chardev #
    # GPIO gpio-mockup test with ranges <-1,32,-1,32,-1,32>
    gpio-mockup: test_with #
    # -1,32,-1,32,-1,32
    ...
    [ 407.481225] test_bpf: #0 TAX jited:1 63 62 132 PASS

    The console seems broken for over 40 seconds?

    --
    Kees Cook

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