linux-kernel - Re: [PATCH V14] mm/debug: Add tests validating architecture page table helpers

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Date:   Wed, 4 Mar 2020 06:29:23 -0500
From:   Qian Cai <cai@....pw>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Anshuman Khandual <Anshuman.Khandual@....com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Catalin Marinas <catalin.marinas@....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>,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-s390@...r.kernel.org, linux-riscv@...ts.infradead.org,
        the arch/x86 maintainers <x86@...nel.org>,
        linux-arch@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Subject: Re: [PATCH V14] mm/debug: Add tests validating architecture page table helpers



> On Mar 4, 2020, at 1:49 AM, Christophe Leroy <christophe.leroy@....fr> wrote:
> 
> AFAIU, you are not taking an interrupt here. You are stuck in the pte_update(), most likely due to nested locks. Try with LOCKDEP ?

Not exactly sure what did you mean here, but the kernel has all lockdep enabled and did not flag anything here.