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a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1697444956; h=from:from:sender:reply-to: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=tLtJA5C+JwFLsMDmgoCYqDqd0PhL2DqUr4ApNuM6wgA=; b=ekAbRv4+xjWs+yOaqx8+peFDnCppZdgFdG/ntGwpy26OJcpmXO58Qdsx8wXo8F5H9Vbau+ qAFM8ZvF60I71fZD7jJHnYelyIbzS7vX3anFbpVB7UEnoLrJI2epP/Af1bGS2JAqeZqLD0 T/jJpnKrLXUQysO2PJ8DhoqPisizUsw= Received: from [2a02:8108:8980:2478:8cde:aa2c:f324:937e]; authenticated by wp530.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) id 1qsIyQ-0005VB-FA; Mon, 16 Oct 2023 10:29:14 +0200 Message-ID: <3e1f079f-a0a7-43b3-96db-24c2e04d5ff8@leemhuis.info> Date: Mon, 16 Oct 2023 10:29:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/2] maple_tree: Disable mas_wr_append() when other readers are possible Content-Language: en-US, de-DE From: "Linux regression tracking #update (Thorsten Leemhuis)" To: Linux kernel regressions list Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org Reply-To: Linux regressions mailing list , Linux regressions mailing list References: <20230819004356.1454718-1-Liam.Howlett@oracle.com> <20230819004356.1454718-2-Liam.Howlett@oracle.com> <3f86d58e-7f36-c6b4-c43a-2a7bcffd3bd@linux-m68k.org> <7e9735bf-c42b-4f03-8645-8cdbf87a75f3@leemhuis.info> In-Reply-To: <7e9735bf-c42b-4f03-8645-8cdbf87a75f3@leemhuis.info> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-bounce-key: webpack.hosteurope.de;regressions@leemhuis.info;1697444956;348b960e; X-HE-SMSGID: 1qsIyQ-0005VB-FA X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 35E9D14000A X-Stat-Signature: 7gqj6bgsyyio4k7phioh3waf3s5pqf7e X-HE-Tag: 1697444955-762206 X-HE-Meta: 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 zBGCfer/ lNMd030d3LDvJfKXrmw3L+a5NhPxuaQfadOpvJ/kNYizi0sjRGyYvaUhoPPqDlSjJ/rxGdzCDYMV/9j9WqPLAYztfB0REWMD1x/vLBGRZ+clALltNumaTFW1e0YY813mtl6RUwXH85NV+jS36OMwcHTByEWHI5JSeZR/IbuGWPKpb/H0lREyHndJeMvkhEuM5Dlf62OGxbnKivRAwxJQydQWwLKKRFWIPxb4gCJI18HkeRKlWoMHpcMDUzkwEI3ZuOW9ESc3Yowy1fa0pmtUSlCC6TjElocA9ePb91fiPGjQlv6QqSRHipu1oJbvwhkqObl4IzK9JSzhZdlB+RKLmTNVrvpg2vE4s5uYyjdLoAr3AXgRCVO4bLC6mD3ZPf5jzwYj+G4HlSxzZq2l4r4m3Xck2OFMf8d+vsp9GcjgeITYTgM8= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000172, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 11.09.23 14:27, Linux regression tracking #adding (Thorsten Leemhuis) wrote: > On 29.08.23 18:42, Geert Uytterhoeven wrote: >> >> On Fri, 18 Aug 2023, Liam R. Howlett wrote: >>> The current implementation of append may cause duplicate data and/or >>> incorrect ranges to be returned to a reader during an update.  Although >>> this has not been reported or seen, disable the append write operation >>> while the tree is in rcu mode out of an abundance of caution. >>> >>> During the analysis of the mas_next_slot() the following was >>> artificially created by separating the writer and reader code: >> [...] >> Thanks for your patch, which is now commit cfeb6ae8bcb96ccf >> ("maple_tree: disable mas_wr_append() when other readers are >> possible") in v6.5, and is being backported to stable. >> >> On Renesas RZ/A1 and RZ/A2 (single-core Cortex-A9), this causes the >> following warning: >>> […] >> Reverting this commit fixes the issue. #regzbot fix: cff9b2332ab762 #regzbot ignore-activity Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) -- Everything you wanna know about Linux kernel regression tracking: https://linux-regtracking.leemhuis.info/about/#tldr That page also explains what to do if mails like this annoy you.