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From:   Qian Cai <cai@lca.pw>
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Subject: Re: [mm/debug] fa6726c1e7: kernel_BUG_at_include/linux/mm.h
Date:   Mon, 27 Apr 2020 22:05:06 -0400
Message-Id: <31CD915D-2E14-4897-AF62-82B6C5FD567A@lca.pw>
References: <51dcbcbf-6020-6672-05b0-5bb10c6292b5@arm.com>
Cc:     kernel test robot <lkp@intel.com>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Christophe Leroy <christophe.leroy@c-s.fr>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Ingo Molnar <mingo@kernel.org>,
        Mike Rapoport <rppt@linux.ibm.com>,
        Vineet Gupta <vgupta@synopsys.com>,
        Will Deacon <will@kernel.org>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        "Kirill A. Shutemov" <kirill@shutemov.name>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>, lkp@lists.01.org
In-Reply-To: <51dcbcbf-6020-6672-05b0-5bb10c6292b5@arm.com>
To:     Anshuman Khandual <Anshuman.Khandual@arm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


> On Apr 27, 2020, at 9:49 PM, Anshuman Khandual <Anshuman.Khandual@arm.com>=
 wrote:
>=20
> This is an unsupported (enabled via CONFIG_EXPERT) X86 platform (CONFIG_X8=
6_PAE)
> and is known to fail. The latest (V17) patch had moved the test invocation=
 into
> a late_initcall() per Linus thus pushing down any possible failures (like t=
his)
> after early boot. Please ignore this report.
>=20
> Apart from this X86_PAE based config, no other platform failures have repo=
rted
> so far. Assuming that this test robot does have a good platform coverage, t=
he
> CONFIG_EXPERT method of enabling CONFIG_DEBUG_VM_PGTABLE should help in ge=
tting
> more platform coverage for this test.

This sounds really sloppy. Why can=E2=80=99t we make it impossible to select=
 this combination if nobody is willing to fix it?=