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From:   RAJESH DASARI <raajeshdasari@gmail.com>
Date:   Mon, 22 Aug 2022 22:23:02 +0300
Message-ID: <CAPXMrf-Gc-Mv1goZrk59GG96OLPxEUC-FKT6Dwo6TU6D7po=gw@mail.gmail.com>
Subject: Re: bpf selftest failed in 5.4.210 kernel
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     Jean-Philippe Brucker <jean-philippe@linaro.org>,
        stable@vger.kernel.org, linux-kernel@vger.kernel.org, df@google.com
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Hi,

Please find the test scenarios which I have tried.

Test 1:

Running system Kernel version (tag/commit) :  v5.4.210
Kernel source code checkout : v5.4.210
test_align test case execution status : Failure

Test 2:

Running system Kernel version (tag/commit) : v5.4.210
Kernel source code checkout : v5.4.209
test_align test case execution status : Failure

Test 3:

Running system Kernel version (tag/commit) : v5.4.209
Kernel source code checkout : v5.4.209
test_align test case execution status : Success

Test 4:

Running system Kernel version (tag/commit) : ACPI: APEI: Better fix to
avoid spamming the console with old error logs ( Kernel compiled at
this commit  and system is booted with this change)
Kernel source code checkout : v5.4.210 but reverted selftests/bpf: Fix
test_align verifier log patterns and selftests/bpf: Fix "dubious
pointer arithmetic" test. If I revert only the Fix "dubious pointer
arithmetic" test, the testcase still fails.
test_align test case execution status : Success

Test 5:

Running system Kernel version (tag/commit) :  v5.4.210 but reverted
commit (bpf: Verifer, adjust_scalar_min_max_vals to always call
update_reg_bounds() )
Kernel source code checkout : v5.4.210 but reverted selftests/bpf: Fix
test_align verifier log patterns and selftests/bpf: Fix "dubious
pointer arithmetic" test.
test_align test case execution status : Success

Test 6 :

Running system Kernel version (tag/commit) : bpf: Test_verifier, #70
error message updates for 32-bit right shift( Kernel compiled at this
commit  and system is booted with this change)
Kernel source code checkout : v5.4.209 or v5.4.210
test_align test case execution status : Failure

Thanks,
Rajesh Dasari.

On Sat, Aug 20, 2022 at 10:00 AM Greg KH <gregkh@linuxfoundation.org> wrote:
>
> On Fri, Aug 19, 2022 at 07:20:11PM +0300, RAJESH DASARI wrote:
> > Hi ,
> >
> > I did some more tests ,  Please find the observation below.
> >
> > step 1:  On v5.4.210 kernel , I reverted  only commit  bpf: Verifer,
> > adjust_scalar_min_max_vals to always call update_reg_bounds()
> > 7c1134c7da997523e2834dd516e2ddc51920699a , compiled the kernel and
> > booted the system with the new kernel.
> > step 2:  On system with newly compiled kernel , I clone the  v54.4.210
> > source code  and  reverted  commit  selftests/bpf: Fix test_align
> > verifier log patterns  and selftests/bpf: Fix "dubious pointer
> > arithmetic" test , then ran the selftests, test_align test cases
> > execution was successful.
> > step 3: If i revert only selftests/bpf: Fix "dubious pointer
> > arithmetic" test , test cases are still failing.
> >
> >
> >
> > Please find the attached PDF for the other scenarios which I have executed.
>
> For obvious reasons, we can't read random .pdf files sent to us.  Please
> put it all in text.
>
> thanks,
>
> greg k-h