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[71.184.117.43]) by smtp.gmail.com with ESMTPSA id u48sm85943qtc.79.2020.03.04.03.29.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Mar 2020 03:29:24 -0800 (PST) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable From: Qian Cai Mime-Version: 1.0 (1.0) Subject: Re: [PATCH V14] mm/debug: Add tests validating architecture page table helpers Date: Wed, 4 Mar 2020 06:29:23 -0500 Message-Id: <11F41980-97CF-411F-8120-41287DC1A382@lca.pw> References: Cc: Anshuman Khandual , Linux Memory Management List , Andrew Morton , Mike Rapoport , Vineet Gupta , Catalin Marinas , Will Deacon , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , "Kirill A . Shutemov" , Paul Walmsley , Palmer Dabbelt , linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev , linux-s390@vger.kernel.org, linux-riscv@lists.infradead.org, the arch/x86 maintainers , linux-arch@vger.kernel.org, LKML , "Aneesh Kumar K.V" In-Reply-To: To: Christophe Leroy X-Mailer: iPhone Mail (17D50) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > On Mar 4, 2020, at 1:49 AM, Christophe Leroy wro= te: >=20 > AFAIU, you are not taking an interrupt here. You are stuck in the pte_upda= te(), most likely due to nested locks. Try with LOCKDEP ? Not exactly sure what did you mean here, but the kernel has all lockdep enab= led and did not flag anything here.=