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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: In-Reply-To: To: Christophe Leroy X-Mailer: iPhone Mail (17D50) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200304_032927_340731_39762AF2 X-CRM114-Status: UNSURE ( 6.99 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Benjamin Herrenschmidt , Heiko Carstens , Linux Memory Management List , Paul Mackerras , "H. Peter Anvin" , linux-riscv@lists.infradead.org, Will Deacon , linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, Michael Ellerman , the arch/x86 maintainers , Mike Rapoport , Christian Borntraeger , Ingo Molnar , Catalin Marinas , linux-snps-arc@lists.infradead.org, Vasily Gorbik , Anshuman Khandual , Borislav Petkov , Paul Walmsley , "Kirill A . Shutemov" , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Vineet Gupta , LKML , Palmer Dabbelt , "Aneesh Kumar K.V" , Andrew Morton , linuxppc-dev Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org > 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.=