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Date:   Tue, 25 Feb 2020 11:31:11 -0800
From:   Kees Cook <keescook@chromium.org>
To:     Naresh Kamboju <naresh.kamboju@linaro.org>
Cc:     "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@vger.kernel.org>, Shuah Khan <shuah@kernel.org>,
        Anders Roxell <anders.roxell@linaro.org>,
        lkft-triage@lists.linaro.org,
        open list <linux-kernel@vger.kernel.org>, ankita@in.ibm.com,
        Will Deacon <will@kernel.org>, ardb@kernel.org,
        "Guohanjun (Hanjun Guo)" <guohanjun@huawei.com>
Subject: Re: selftests: Linux Kernel Dump Test Module output
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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