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Wed, 4 Mar 2020 07:49:01 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1583304541; bh=wrQNL9rvesEDlWoNS4tGcfPvGhYnLZNAbgZHq9fGbnE=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=TjnV6xMQKz2IO1bGDE4HAZJMFDjYTtnjTtNNjZEsh1GJH/DNUiegOPbfzQzRdUJdq mfbcsqR6vxFcKaMgtar20QBjEJl5cDZGZqEWM5VabMwt/qfmG0b/5ARzKJJU0pQlpP HX98Thi1AQonukArlC4ShOrxhDCLgoABIqbXgKFo= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 784788B826; Wed, 4 Mar 2020 07:49:02 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id oPUcSMTN_Vcy; Wed, 4 Mar 2020 07:49:02 +0100 (CET) Received: from [172.25.230.100] (po15451.idsi0.si.c-s.fr [172.25.230.100]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 2A1098B820; Wed, 4 Mar 2020 07:49:02 +0100 (CET) Subject: Re: [PATCH V14] mm/debug: Add tests validating architecture page table helpers To: Qian Cai , Anshuman Khandual References: <1581909460-19148-1-git-send-email-anshuman.khandual@arm.com> <1582726182.7365.123.camel@lca.pw> <7c707b7f-ce3d-993b-8042-44fdc1ed28bf@c-s.fr> <1582732318.7365.129.camel@lca.pw> <1583178042.7365.146.camel@lca.pw> <12260F9A-695D-40F8-932F-61D86D77D441@lca.pw> From: Christophe Leroy Message-ID: Date: Wed, 4 Mar 2020 07:48:54 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <12260F9A-695D-40F8-932F-61D86D77D441@lca.pw> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200303_224908_201407_50865962 X-CRM114-Status: GOOD ( 11.45 ) 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 , 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 Le 04/03/2020 à 02:39, Qian Cai a écrit : > >> Below is slightly modified version of your change above and should still >> prevent the bug on powerpc. Will it be possible for you to re-test this >> ? Once confirmed, will send a patch enabling this test on powerpc64 >> keeping your authorship. Thank you. > > This works fine on radix MMU but I decided to go a bit future to test hash > MMU. The kernel will stuck here below. I did confirm that pte_alloc_map_lock() > was successful, so I don’t understand hash MMU well enough to tell why > it could still take an interrupt at pte_clear_tests() even before we calls > pte_unmap_unlock()? AFAIU, you are not taking an interrupt here. You are stuck in the pte_update(), most likely due to nested locks. Try with LOCKDEP ? Christophe > > [ 33.881515][ T1] ok 8 - property-entry > [ 33.883653][ T1] debug_vm_pgtable: debug_vm_pgtable: Validating > architecture page table helpers > [ 60.418885][ C8] watchdog: BUG: soft lockup - CPU#8 stuck for 23s! > [swapper/0:1]