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=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 BD013C43461 for ; Mon, 17 May 2021 11:28:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9E46361166 for ; Mon, 17 May 2021 11:28:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236712AbhEQL33 (ORCPT ); Mon, 17 May 2021 07:29:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56398 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236684AbhEQL32 (ORCPT ); Mon, 17 May 2021 07:29:28 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4FF5FC061573; Mon, 17 May 2021 04:28:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; 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; bh=ki3+tsvw0l9avC0LZmElq90RxHeKpxQAWRBtoDZLG7U=; b=jEUyKbdH4S8dLaODGEz/kwaDiJ Br13KGOmPTXWbEmZT8jeC7kpe3G0obKnBW91Xte98XtD9mnrnJvukSWtQz9ggiewJwCFTXwT9iGew ViCm44or0/+8JszLUdYjcT2vfQtEx+3qCQQsfJi0Q7m7qivq1Ln3iuOtfSgmwFXZS25dHY/NRxvUT Z3d35IoWX2mJqq6s8KGn0fu+x1WsClQ6z1F1LeBl69ezaUUnvQ1azgYdMbYNboTPPQVfI92pTxut+ AWafEFDsas6Sauq53ab/Me8zLmODZiWmh9cMgO03LRuXc2ksXGnRy3CNsn1EshFBAoUIXebuStdHD j1/DfiIw==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1libPc-00Ej3l-4q; Mon, 17 May 2021 11:27:52 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 6CF6E30022A; Mon, 17 May 2021 13:27:49 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 31B682028F059; Mon, 17 May 2021 13:27:49 +0200 (CEST) Date: Mon, 17 May 2021 13:27:49 +0200 From: Peter Zijlstra To: syzbot Cc: acme@kernel.org, alexander.shishkin@linux.intel.com, andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com, jolsa@redhat.com, kafai@fb.com, kpsingh@kernel.org, linux-kernel@vger.kernel.org, mark.rutland@arm.com, mingo@redhat.com, namhyung@kernel.org, netdev@vger.kernel.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, yhs@fb.com Subject: Re: [syzbot] WARNING in __perf_install_in_context Message-ID: References: <000000000000b3d89a05c284718f@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000000000000b3d89a05c284718f@google.com> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Mon, May 17, 2021 at 03:56:22AM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 18a3c5f7 Merge tag 'for_linus' of git://git.kernel.org/pub.. > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git fixes > console output: https://syzkaller.appspot.com/x/log.txt?x=1662c153d00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=b8ac1fe5995f69d7 > dashboard link: https://syzkaller.appspot.com/bug?extid=0fb24f56fa707081e4f2 > userspace arch: riscv64 > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+0fb24f56fa707081e4f2@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 8643 at kernel/events/core.c:2781 __perf_install_in_context+0x1c0/0x47c kernel/events/core.c:2781 > Modules linked in: > CPU: 1 PID: 8643 Comm: syz-executor.0 Not tainted 5.12.0-rc8-syzkaller-00011-g18a3c5f7abfd #0 > Hardware name: riscv-virtio,qemu (DT) How serious should I take this thing? ARM64 and x86_64 don't show these errors.