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h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=NDOh5rkhtbjwKF9cqx25v2bYJ27KT6ltJhBfsKoGY5Y=; b=WDC8yP5c0gswYcXpPIa05oWX3XS2L7EWrIEa+4IKgfE/f+n48DC5poD6d/oQYhJzBoJAlQ rnLjaRKc3cfXxLVNyonAB4bOq4mjyTxZmuGyuvsvWwelRAj1QgkxqUEiRgyf4hAKLa7/uI nhXSUMRUGaDORicH2SX94nHXzU0m3S+NyFtfEbNVE8cJaR3w0zWJOp6649LtBCs+2fUgoO bHtTy4j5++WoKTzyjFlz1jMqIzrdQy3xpigPdMQd6807LeJ9oP8ooS6aAOUZuaq6l0qmUO UIErJy6Xk8XhG/WVxoRPKksDr9FBDvmQxkFHJ/bqh/KhpqyrmFmFyXYBCpno2A== Date: Tue, 5 Mar 2024 02:29:41 +0100 From: Erhard Furtner To: Christophe Leroy Cc: Nicholas Piggin , "linux-mm@kvack.org" , "linuxppc-dev@lists.ozlabs.org" , Rohan McLure Subject: Re: BUG: Bad page map in process init pte:c0ab684c pmd:01182000 (on a PowerMac G4 DP) Message-ID: <20240305022941.356139ba@yea> In-Reply-To: <707f617f-45c8-4fa1-83aa-779f2b542871@csgroup.eu> References: <20221130224402.15c0cf8b@yea> <20240229020941.2b30abe0@yea> <707f617f-45c8-4fa1-83aa-779f2b542871@csgroup.eu> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-MBO-RS-ID: a6c62d67654acccb744 X-MBO-RS-META: tmdf7i516d3349gr8cjkjxtycpu9gx7r X-Rspam-User: X-Stat-Signature: qmg3owc53r39df1s37yi5ugmb7hcj1ai X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 306B4A0005 X-HE-Tag: 1709602194-145909 X-HE-Meta: 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 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: List-Subscribe: List-Unsubscribe: On Thu, 29 Feb 2024 17:11:28 +0000 Christophe Leroy wrote: > Interesting. > > I guess 0xe0000000 is where linear RAM starts to be mapped with pages ? > Can you confirm with a dump of > /sys/kernel/debug/powerpc/block_address_translation ? # cat /sys/kernel/debug/powerpc/block_address_translation ---[ Instruction Block Address Translation ]--- 0: 0xc0000000-0xc0ffffff 0x00000000 16M Kernel x m 1: 0xc1000000-0xc13fffff 0x01000000 4M Kernel x m 2: 0xc1400000-0xc15fffff 0x01400000 2M Kernel x m 3: 0xc1600000-0xc16fffff 0x01600000 1M Kernel x m 4: - 5: - 6: - 7: - ---[ Data Block Address Translation ]--- 0: 0xc0000000-0xc0ffffff 0x00000000 16M Kernel r m 1: 0xc1000000-0xc17fffff 0x01000000 8M Kernel r m 2: 0xc1800000-0xc1bfffff 0x01800000 4M Kernel r m 3: 0xf8000000-0xfbffffff 0x7c000000 64M Kernel rw m 4: 0xfc000000-0xfdffffff 0x7a000000 32M Kernel rw m 5: - 6: - 7: - block_address_translation looks different after the page corruption: # cat /sys/kernel/debug/powerpc/block_address_translation ---[ Instruction Block Address Translation ]--- 0: 0xc0000000-0xc1ffffff 0x00000000 32M Kernel x m 1: - 2: - 3: - 4: - 5: - 6: - 7: - ---[ Data Block Address Translation ]--- 0: 0xc0000000-0xc0ffffff 0x00000000 16M Kernel rw m 1: 0xc1000000-0xc17fffff 0x01000000 8M Kernel rw m 2: 0xc1800000-0xc1bfffff 0x01800000 4M Kernel rw m 3: 0xf8000000-0xfbffffff 0x7c000000 64M Kernel rw m 4: 0xfc000000-0xfdffffff 0x7a000000 32M Kernel rw m 5: - 6: - 7: - > Do we have a problem of race with hash table ? > > Would KCSAN help with that ? KCSAN did not report any hits during "stress -m 2 --vm-bytes 965M". Options used: KCSAN_SELFTEST=y, KCSAN_REPORT_ONCE_IN_MS=12000, KCSAN_REPORT_RACE_UNKNOWN_ORIGIN=y, KCSAN_STRICT=y, KCSAN_WEAK_MEMORY=y. Regards, Erhard From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EC011C54E49 for ; Tue, 5 Mar 2024 01:30:44 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; secure) header.d=mailbox.org header.i=@mailbox.org header.a=rsa-sha256 header.s=mail20150812 header.b=WDC8yP5c; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4TpdLC4J9Lz3dXM for ; Tue, 5 Mar 2024 12:30:43 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; secure) header.d=mailbox.org header.i=@mailbox.org header.a=rsa-sha256 header.s=mail20150812 header.b=WDC8yP5c; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=mailbox.org (client-ip=80.241.56.172; helo=mout-p-202.mailbox.org; envelope-from=erhard_f@mailbox.org; receiver=lists.ozlabs.org) Received: from mout-p-202.mailbox.org (mout-p-202.mailbox.org [80.241.56.172]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4TpdKQ14Csz30Pp for ; Tue, 5 Mar 2024 12:29:58 +1100 (AEDT) Received: from smtp102.mailbox.org (smtp102.mailbox.org [10.196.197.102]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-202.mailbox.org (Postfix) with ESMTPS id 4TpdKB23X2z9sqs; Tue, 5 Mar 2024 02:29:50 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1709602190; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=NDOh5rkhtbjwKF9cqx25v2bYJ27KT6ltJhBfsKoGY5Y=; b=WDC8yP5c0gswYcXpPIa05oWX3XS2L7EWrIEa+4IKgfE/f+n48DC5poD6d/oQYhJzBoJAlQ rnLjaRKc3cfXxLVNyonAB4bOq4mjyTxZmuGyuvsvWwelRAj1QgkxqUEiRgyf4hAKLa7/uI nhXSUMRUGaDORicH2SX94nHXzU0m3S+NyFtfEbNVE8cJaR3w0zWJOp6649LtBCs+2fUgoO bHtTy4j5++WoKTzyjFlz1jMqIzrdQy3xpigPdMQd6807LeJ9oP8ooS6aAOUZuaq6l0qmUO UIErJy6Xk8XhG/WVxoRPKksDr9FBDvmQxkFHJ/bqh/KhpqyrmFmFyXYBCpno2A== Date: Tue, 5 Mar 2024 02:29:41 +0100 From: Erhard Furtner To: Christophe Leroy Subject: Re: BUG: Bad page map in process init pte:c0ab684c pmd:01182000 (on a PowerMac G4 DP) Message-ID: <20240305022941.356139ba@yea> In-Reply-To: <707f617f-45c8-4fa1-83aa-779f2b542871@csgroup.eu> References: <20221130224402.15c0cf8b@yea> <20240229020941.2b30abe0@yea> <707f617f-45c8-4fa1-83aa-779f2b542871@csgroup.eu> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-MBO-RS-ID: a6c62d67654acccb744 X-MBO-RS-META: tmdf7i516d3349gr8cjkjxtycpu9gx7r X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "linux-mm@kvack.org" , Rohan McLure , "linuxppc-dev@lists.ozlabs.org" , Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, 29 Feb 2024 17:11:28 +0000 Christophe Leroy wrote: > Interesting. > > I guess 0xe0000000 is where linear RAM starts to be mapped with pages ? > Can you confirm with a dump of > /sys/kernel/debug/powerpc/block_address_translation ? # cat /sys/kernel/debug/powerpc/block_address_translation ---[ Instruction Block Address Translation ]--- 0: 0xc0000000-0xc0ffffff 0x00000000 16M Kernel x m 1: 0xc1000000-0xc13fffff 0x01000000 4M Kernel x m 2: 0xc1400000-0xc15fffff 0x01400000 2M Kernel x m 3: 0xc1600000-0xc16fffff 0x01600000 1M Kernel x m 4: - 5: - 6: - 7: - ---[ Data Block Address Translation ]--- 0: 0xc0000000-0xc0ffffff 0x00000000 16M Kernel r m 1: 0xc1000000-0xc17fffff 0x01000000 8M Kernel r m 2: 0xc1800000-0xc1bfffff 0x01800000 4M Kernel r m 3: 0xf8000000-0xfbffffff 0x7c000000 64M Kernel rw m 4: 0xfc000000-0xfdffffff 0x7a000000 32M Kernel rw m 5: - 6: - 7: - block_address_translation looks different after the page corruption: # cat /sys/kernel/debug/powerpc/block_address_translation ---[ Instruction Block Address Translation ]--- 0: 0xc0000000-0xc1ffffff 0x00000000 32M Kernel x m 1: - 2: - 3: - 4: - 5: - 6: - 7: - ---[ Data Block Address Translation ]--- 0: 0xc0000000-0xc0ffffff 0x00000000 16M Kernel rw m 1: 0xc1000000-0xc17fffff 0x01000000 8M Kernel rw m 2: 0xc1800000-0xc1bfffff 0x01800000 4M Kernel rw m 3: 0xf8000000-0xfbffffff 0x7c000000 64M Kernel rw m 4: 0xfc000000-0xfdffffff 0x7a000000 32M Kernel rw m 5: - 6: - 7: - > Do we have a problem of race with hash table ? > > Would KCSAN help with that ? KCSAN did not report any hits during "stress -m 2 --vm-bytes 965M". Options used: KCSAN_SELFTEST=y, KCSAN_REPORT_ONCE_IN_MS=12000, KCSAN_REPORT_RACE_UNKNOWN_ORIGIN=y, KCSAN_STRICT=y, KCSAN_WEAK_MEMORY=y. Regards, Erhard