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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 73C76C43381 for ; Sat, 30 Mar 2019 00:13:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3D4B02173C for ; Sat, 30 Mar 2019 00:13:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730126AbfC3ANe (ORCPT ); Fri, 29 Mar 2019 20:13:34 -0400 Received: from www262.sakura.ne.jp ([202.181.97.72]:15631 "EHLO www262.sakura.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729963AbfC3ANe (ORCPT ); Fri, 29 Mar 2019 20:13:34 -0400 Received: from fsav103.sakura.ne.jp (fsav103.sakura.ne.jp [27.133.134.230]) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTP id x2U0D7L8037310; Sat, 30 Mar 2019 09:13:07 +0900 (JST) (envelope-from penguin-kernel@I-love.SAKURA.ne.jp) Received: from www262.sakura.ne.jp (202.181.97.72) by fsav103.sakura.ne.jp (F-Secure/fsigk_smtp/530/fsav103.sakura.ne.jp); Sat, 30 Mar 2019 09:13:07 +0900 (JST) X-Virus-Status: clean(F-Secure/fsigk_smtp/530/fsav103.sakura.ne.jp) Received: from [192.168.1.8] (softbank126072090247.bbtec.net [126.72.90.247]) (authenticated bits=0) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTPSA id x2U0D7qO037307 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NO); Sat, 30 Mar 2019 09:13:07 +0900 (JST) (envelope-from penguin-kernel@I-love.SAKURA.ne.jp) Subject: Re: INFO: rcu detected stall in corrupted (3) To: syzbot , syzkaller-bugs@googlegroups.com References: <000000000000b08190058543449f@google.com> Cc: bp@alien8.de, hpa@zytor.com, linux-kernel@vger.kernel.org, luto@kernel.org, mingo@redhat.com, tglx@linutronix.de, x86@kernel.org From: Tetsuo Handa Message-ID: <8ecb5bc9-5761-64d0-64b2-1310300a64ec@I-love.SAKURA.ne.jp> Date: Sat, 30 Mar 2019 09:13:07 +0900 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.0 MIME-Version: 1.0 In-Reply-To: <000000000000b08190058543449f@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2019/03/30 7:34, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit:    8c2ffd91 Linux 5.1-rc2 > git tree:       upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=15099d2b200000 > kernel config:  https://syzkaller.appspot.com/x/.config?x=8dcdce25ea72bedf > dashboard link: https://syzkaller.appspot.com/bug?extid=65cecdd27b726c261799 > compiler:       gcc (GCC) 9.0.0 20181231 (experimental) > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17d3c67d200000 > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11d4f317200000 > > Bisection is inconclusive: the bug happens on the oldest tested release. This reproducer does sched_setattr(SCHED_DEADLINE) with bogus value, as with a reproducer for "INFO: rcu detected stall in sys_sendfile64" did. sched_setattr(0, {size=0, sched_policy=0x6 /* SCHED_DEADLINE */, sched_flags=0, sched_nice=0, sched_priority=0, sched_runtime=65535, sched_deadline=4611686018427453437, sched_period=0}, 0) = 0 #syz invalid