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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 A8018C2D0C0 for ; Thu, 26 Dec 2019 22:06:03 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6F0192080D for ; Thu, 26 Dec 2019 22:06:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6F0192080D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 0B5888E0005; Thu, 26 Dec 2019 17:06:03 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 066A78E0001; Thu, 26 Dec 2019 17:06:03 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EBE8E8E0005; Thu, 26 Dec 2019 17:06:02 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0062.hostedemail.com [216.40.44.62]) by kanga.kvack.org (Postfix) with ESMTP id D27D48E0001 for ; Thu, 26 Dec 2019 17:06:02 -0500 (EST) Received: from smtpin04.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with SMTP id 8DC324425 for ; Thu, 26 Dec 2019 22:06:02 +0000 (UTC) X-FDA: 76308676164.04.loss33_8c0621c3cc445 X-HE-Tag: loss33_8c0621c3cc445 X-Filterd-Recvd-Size: 3190 Received: from mail-il1-f199.google.com (mail-il1-f199.google.com [209.85.166.199]) by imf18.hostedemail.com (Postfix) with ESMTP for ; Thu, 26 Dec 2019 22:06:02 +0000 (UTC) Received: by mail-il1-f199.google.com with SMTP id x69so21656094ill.14 for ; Thu, 26 Dec 2019 14:06:02 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=gzUrg7S5MS19Le8XOVi5kKaSwBX6RM9XMQ6La+L8Ojw=; b=owF6U38ujLv1JklKqx8ebUbIrZ4D+sLMsvdDJEIc0g65rl7JKTwqEfKmNk4R3cVrZw 5n4TGxZV8bKRX/FwzHg6eQPqvVjSIqMZqFcHX5GAI6acjUmZrCUHhIyPYKSP/UT6bG7A KqdnhlTjonWvShnmJ1Jhtg8jr2Z53v1PSLNW2VLA6ynh8ssBGfgG8qxXrWJAtjCASnFg uOGbGmfTRBQJ6ecjhmCtzC4Z+X98YIHxfvC+w4Kd95ev7TwmZKQzu1i3TnbHqT1zKLz0 PWQ8Ga4pMgfCovu6aWsRx68l/JyiiIbdyNRSuIMGmuKgefwG0ii0eZmMMAiexz8Q6vAY NWmw== X-Gm-Message-State: APjAAAV4X5+fTGzUw84+oxi77uX6NiYARo9zazsl9S+gVNQ2axsUHsfv RXvgB7mr9Vgr3FXIokf0gq7jB1qpc4HPcqMIH0gBo4k9Ow3j X-Google-Smtp-Source: APXvYqyMZv3kpon40+DQrGh+yfCnK8mSm9toK+x/iErfeVKIKwnfL/LxGdCfc0MoETQHENDEpuke1u/6VGg2emJes+rvcYK8a8Om MIME-Version: 1.0 X-Received: by 2002:a5d:964e:: with SMTP id d14mr31633862ios.193.1577397961566; Thu, 26 Dec 2019 14:06:01 -0800 (PST) Date: Thu, 26 Dec 2019 14:06:01 -0800 In-Reply-To: <000000000000016d8b059aa2030e@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000002b326d059aa295e9@google.com> Subject: Re: INFO: task hung in sync_inodes_sb (3) From: syzbot To: akpm@linux-foundation.org, axboe@kernel.dk, dave@stgolabs.net, hch@lst.de, hughd@google.com, ktkhai@virtuozzo.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@suse.com, ming.lei@redhat.com, osandov@fb.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes 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: syzbot has bisected this bug to: commit 6dc4f100c175dd0511ae8674786e7c9006cdfbfa Author: Ming Lei Date: Fri Feb 15 11:13:19 2019 +0000 block: allow bio_for_each_segment_all() to iterate over multi-page bvec bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1674423ee00000 start commit: 46cf053e Linux 5.5-rc3 git tree: upstream final crash: https://syzkaller.appspot.com/x/report.txt?x=1574423ee00000 console output: https://syzkaller.appspot.com/x/log.txt?x=1174423ee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=ed9d672709340e35 dashboard link: https://syzkaller.appspot.com/bug?extid=2b9e54155c8c25d8d165 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=152bdc56e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=159c489ee00000 Reported-by: syzbot+2b9e54155c8c25d8d165@syzkaller.appspotmail.com Fixes: 6dc4f100c175 ("block: allow bio_for_each_segment_all() to iterate over multi-page bvec") For information about bisection process see: https://goo.gl/tpsmEJ#bisection