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=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 032FBC388F3 for ; Tue, 1 Oct 2019 08:45:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CAD34215EA for ; Tue, 1 Oct 2019 08:45:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="pyD+v/H3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733133AbfJAIp1 (ORCPT ); Tue, 1 Oct 2019 04:45:27 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:34124 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726148AbfJAIp0 (ORCPT ); Tue, 1 Oct 2019 04:45:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=mF3/fd7P0Rq3M0sPBe2764euN8GKHuf61uE85D6TBMI=; b=pyD+v/H3OMJvvbdz4cwbTDBnK O5Mo4Bk0nUWzFLLGP6W5S1S76jg+Ywr1Cd4Lu7Pr11a1bYWcp+pScCWqIARrA0b5GX5S9B9jtnkQY Uyf1RdzyT2A7EGksLFhrpu9ybJqfcjwLzjKr8T/crLXnorVd8+mrmW3mLsQtqcPrGDMyQWHZ/irh9 DR/BO+uElkmE7VFbUc0uQFiCa0SaM2c9YJReLnG8NbCvvoU9FRE+NBy8oy5vo/LvMUkftas+HwG3c F5WLsDlpf1lu/hGv5y8GQSbvbyyTtOkm3gnGg/e7FDrdf7ndhTnM2HkVY2Xoc8+r9rGLTnDX40ltp zliq5qYDA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.2 #3 (Red Hat Linux)) id 1iFDmc-0006jw-08; Tue, 01 Oct 2019 08:45:22 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 08CFC304B4C; Tue, 1 Oct 2019 10:44:32 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 52182265261AD; Tue, 1 Oct 2019 10:45:20 +0200 (CEST) Date: Tue, 1 Oct 2019 10:45:20 +0200 From: Peter Zijlstra To: syzbot Cc: dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Subject: Re: WARNING in rcu_note_context_switch Message-ID: <20191001084520.GN4519@hirez.programming.kicks-ass.net> References: <000000000000d2661c0593d4dd89@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000000000000d2661c0593d4dd89@google.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 01, 2019 at 01:09:07AM -0700, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 54ecb8f7 Linux 5.4-rc1 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=14972bf3600000 > kernel config: https://syzkaller.appspot.com/x/.config?x=fb0b431ccdf08c1c > dashboard link: https://syzkaller.appspot.com/bug?extid=0e1a9dce275f13907b4e > compiler: clang version 9.0.0 (/home/glider/llvm/clang > 80fee25776c2fb61e74c1ecb1a523375c2500b69) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16875a35600000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=104bd519600000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+0e1a9dce275f13907b4e@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 7994 at kernel/rcu/tree_plugin.h:293 > rcu_note_context_switch+0xdde/0xee0 kernel/rcu/tree_plugin.h:293 > Kernel panic - not syncing: panic_on_warn set ... https://lkml.kernel.org/r/20191001071921.GJ4519@hirez.programming.kicks-ass.net