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 X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9948C388F9 for ; Thu, 22 Oct 2020 23:49:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 89BC3223BF for ; Thu, 22 Oct 2020 23:49:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603410579; bh=w0hhhK9SuJ4StTvf9Zuf0dXNaEgn7v4WIO2UyE2pTVY=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=0gK6YhJkgKy6ux59KDYav0NeYxmSTZItKJ0aajzrlOd3mxKc86oW3WYlB0cBKIW+l FVCpO1NrqMQnlhhDNwGVA+APoGlj0TEDO0ISx4ePiJnwM2aCje0RFltywRDn1B2MWF Ks3Qgx+LJ0uLoWknOfXJZAD5BWNUSOfwFIar2dHw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S373531AbgJVXti (ORCPT ); Thu, 22 Oct 2020 19:49:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35202 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S373518AbgJVXth (ORCPT ); Thu, 22 Oct 2020 19:49:37 -0400 Received: from mail-ej1-x644.google.com (mail-ej1-x644.google.com [IPv6:2a00:1450:4864:20::644]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EEEC4C0613CE for ; Thu, 22 Oct 2020 16:49:36 -0700 (PDT) Received: by mail-ej1-x644.google.com with SMTP id c15so4927091ejs.0 for ; Thu, 22 Oct 2020 16:49:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=lZlkuWdQsWCC+a50v77gxrEMTeODSOjQWFOP4UJJDnk=; b=cUh4yK+PBHMfvd0jB2OsQ/bbtVKzuZXCL7HCSyczFYL0WDzRBvZVm9aGeWWIrYr1bV eQsOXOM/9NK6ZpiQfmHlPRe4enJaYE4/D8F89jSu64rneyt74YTf/zmuRNDcncLY9PbV vox7spklRgKMSQvRa+Z12H1g1wjSNh7DosrlU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=lZlkuWdQsWCC+a50v77gxrEMTeODSOjQWFOP4UJJDnk=; b=FlZkSJo6/H4XHuqA7pF+xb+49qhpuU6zaqFMxB513nGhwgDZQAp9SmYtMXevkpQByn Cw4kmd20sSxCO4YonBFLgB8lzsQCNqO7EaB9i6b9trtQIVutXIGrJF9apCwt281zNT1r qn/K4jOvigu6gxHblNfMKywjjtPzBdp5gcgUf/sxB3CzDLAEOkU8Y8i0lnNaKFTqMt5l YASxLsQQLisyJUxVSqTMX6j0viiqYwHeWTzE68pdnEWDHsR5zfSxs2T8Oj2GJCaJriln 6HO1twMvmo9DZ0oimkSY83HqkBPsqVpqCn3rTL/OCzxSo6jr4he2UdTyXZPTxgCWkEyZ A30A== X-Gm-Message-State: AOAM531KtPz1sUd9AtMu2Nhy53ORfVLhCONt4wBwi8a/CE2aI5CVQer8 MBq4UHy6T0VWx8TTE2NIrUVm9sWHWNCWuA== X-Google-Smtp-Source: ABdhPJxMT80Y0WTA493Xo+np+W/lA3IQHSBMMJ3l82AWz9rwf+WNG4p4JBzeEBZCXuOcUQOOOCS77Q== X-Received: by 2002:a17:906:1f08:: with SMTP id w8mr4638746ejj.181.1603410575432; Thu, 22 Oct 2020 16:49:35 -0700 (PDT) Received: from mail-ej1-f54.google.com (mail-ej1-f54.google.com. [209.85.218.54]) by smtp.gmail.com with ESMTPSA id i4sm56729edq.12.2020.10.22.16.49.35 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Oct 2020 16:49:35 -0700 (PDT) Received: by mail-ej1-f54.google.com with SMTP id a3so4878369ejy.11 for ; Thu, 22 Oct 2020 16:49:35 -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" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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