linux-kernel - Re: [mm/debug] fa6726c1e7: kernel_BUG_at

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Message-Id: <86DB56DA-F2D4-4D79-A609-B427DC3366A8@lca.pw>
Date:   Tue, 28 Apr 2020 03:59:39 -0400
From:   Qian Cai <cai@....pw>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Anshuman Khandual <Anshuman.Khandual@....com>,
        kernel test robot <lkp@...el.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Catalin Marinas <catalin.marinas@....com>,
        Ingo Molnar <mingo@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Will Deacon <will@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: Re: [mm/debug] fa6726c1e7: kernel_BUG_at_include/linux/mm.h



> On Apr 28, 2020, at 2:12 AM, Christophe Leroy <christophe.leroy@....fr> wrote:
> 
> Yes but Qian was saying: "Also, it is not very nice to introduce regressions for robots when testing PAE because they always select CONFIG__EXPERT and CONFIG_DEBUG_VM"
> 
> Here we see that the said regression is not introduced because they select CONFIG__EXPERT and CONFIG_DEBUG_VM. This is because the robots explicitely select DEBUG_VM_PGTABLE.

Right, the robot just tried to be helpful, but never figured out this was a minefield.