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c=relaxed/relaxed; d=yandex.ru; s=mail; t=1680187517; bh=VO0en26O8PrSdBFVkwG8Ovp3sfiCyZcbgKZ05t43wVo=; h=In-Reply-To:Cc:Date:References:To:From:Subject:Message-ID; b=O/7CKkWaZyOy3O41HRO8zV/wpVY3aZIpsOKGpwMZGKsuSAkXXcqUEudtVGNKe94/m a9YJnF3pBF0u+pfblVjgQ3P4jLBNDlFDAOn9anDWCJILCaQhIluyFdvAirZB46bhjQ lG+BmmXUYEoj3OAFLukyIz6yzC6A+sPaiwTUV2cU= Message-ID: <38c80313-ba1c-092c-ae31-f58fe6ffa82c@yandex.ru> Date: Thu, 30 Mar 2023 19:45:14 +0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.1 Subject: Re: MREMAP_DONTUNMAP corrupts initial mapping Content-Language: en-US From: stsp To: Linux Kernel Mailing List Cc: linux-mm@kvack.org, Brian Geffon , Li Xinhai , Dmitry Safonov <0x7f454c46@gmail.com> References: In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 485D220003 X-Stat-Signature: mnwxgbzz1eq9hkws9sc95hqksftcykrn X-Rspam-User: X-HE-Tag: 1680187520-245440 X-HE-Meta: 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 58zTBoOz E7Evjh6fRsf41zFWtnOiIkY5MukM4OL4269jpH3Lp5U8Msd8vsqRtvCJewkBeo6lc5ZbsrQWibFsT3bjSPPKmBJHnYD2Mh+IPp/lSLl4s8feC9aDOjr+0kcSiFD+zWsYk0Hczht1IMkEARNSt1Lc2wWVnP/g5jrKpOMnMMCaESGlAKnPLsJF2RMITwQ9fCDAl2CIwqcPGN3ddUM+PSSeDotRyfoJFW4CW1yyIi3KIKCMe7kjI13vLYVP8l+DQmyDuie7fN1TLb2FeKiylBk7c3QunodRP2glveRQgv/o5iHiskCmixBUAxNtszLWmoWJ7urr4205DX1V3KmE25hhgvQY81zrrCo+egwDWljSD2QWZmdlG1isOw7iZt/J41NQjRkTHyJvRTH8qBOTtZnxU9YjdXPDhrDqjTkaS6kzE3Z3KJKoBzsSEW/YRDGHd4aenpFwFmCEq7H29Hd/JX1NBHoIHxw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000312, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add a few CCs. 30.03.2023 17:38, stsp пишет: > Hello. > > Attached is a small test-case that > demonstrates the problem. > The problem happens if you change > some data in a file-backed private > mapping and then use mremap on > it with MREMAP_DONTUNMAP flag. > The result is: > - destination copy is valid > - source copy restored from the original file > > So the 2 copies do not match.