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[209.85.208.172]) by smtp.gmail.com with ESMTPSA id x131sm411284lff.175.2020.10.22.16.43.45 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Oct 2020 16:43:46 -0700 (PDT) Received: by mail-lj1-f172.google.com with SMTP id p15so3805836ljj.8 for ; Thu, 22 Oct 2020 16:43:45 -0700 (PDT) X-Received: by 2002:a2e:8815:: with SMTP id x21mr2045832ljh.312.1603410225256; Thu, 22 Oct 2020 16:43:45 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Linus Torvalds Date: Thu, 22 Oct 2020 16:43:29 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: mmstress[1309]: segfault at 7f3d71a36ee8 ip 00007f3d77132bdf sp 00007f3d71a36ee8 error 4 in libc-2.27.so[7f3d77058000+1aa000] To: Naresh Kamboju Cc: open list , linux-m68k , X86 ML , LTP List , lkft-triage@lists.linaro.org, Linux-Next Mailing List , linux-mm , kasan-dev , Christian Brauner , Ingo Molnar , Thomas Gleixner , "Matthew Wilcox (Oracle)" , "Peter Zijlstra (Intel)" , Al Viro , Geert Uytterhoeven , Viresh Kumar , zenglg.jy@cn.fujitsu.com, Stephen Rothwell , "Eric W. Biederman" , Dmitry Vyukov Content-Type: text/plain; charset="UTF-8" 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: On Thu, Oct 22, 2020 at 1:55 PM Naresh Kamboju wrote: > > The bad commit points to, > > commit d55564cfc222326e944893eff0c4118353e349ec > x86: Make __put_user() generate an out-of-line call > > I have reverted this single patch and confirmed the reported > problem is not seen anymore. Thanks. Very funky, but thanks. I've been running that commit on my machine for over half a year, and it still looks "trivially correct" to me, but let me go look at it one more time. Can't argue with a reliable bisect and revert.. Linus