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=-0.8 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 D92A0C433F5 for ; Mon, 27 Aug 2018 17:46:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 74687208B4 for ; Mon, 27 Aug 2018 17:46:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 74687208B4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727226AbeH0VeD (ORCPT ); Mon, 27 Aug 2018 17:34:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:59680 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726958AbeH0VeD (ORCPT ); Mon, 27 Aug 2018 17:34:03 -0400 Received: from gandalf.local.home (cpe-66-24-56-78.stny.res.rr.com [66.24.56.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7364C2088E; Mon, 27 Aug 2018 17:46:28 +0000 (UTC) Date: Mon, 27 Aug 2018 13:46:26 -0400 From: Steven Rostedt To: syzbot Cc: linux-kernel@vger.kernel.org, mingo@redhat.com, syzkaller-bugs@googlegroups.com, Alexei Starovoitov , Daniel Borkmann , netdev@vger.kernel.org Subject: Re: WARNING in format_decode (2) Message-ID: <20180827134626.1b943593@gandalf.local.home> In-Reply-To: <000000000000e12d4105746dcb0d@google.com> References: <000000000000e12d4105746dcb0d@google.com> X-Mailer: Claws Mail 3.16.0 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 27 Aug 2018 10:10:04 -0700 syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 2ad0d5269970 Merge git://git.kernel.org/pub/scm/linux/kern.. > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=15b8efba400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=79e695838ce7a210 > dashboard link: https://syzkaller.appspot.com/bug?extid=1ec5c5ec949c4adaa0c4 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1626f761400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+1ec5c5ec949c4adaa0c4@syzkaller.appspotmail.com > > ** ** > ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** > ********************************************************** > ------------[ cut here ]------------ > Please remove unsupported %WARNING: CPU: 0 PID: 6453 at lib/vsprintf.c:2149 format_decode+0x8fc/0xaf0 > lib/vsprintf.c:2149 > Kernel panic - not syncing: panic_on_warn set ... > > CPU: 0 PID: 6453 Comm: syz-executor7 Not tainted 4.18.0+ #190 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 > panic+0x238/0x4e7 kernel/panic.c:184 > __warn.cold.8+0x163/0x1ba kernel/panic.c:536 > report_bug+0x252/0x2d0 lib/bug.c:186 > fixup_bug arch/x86/kernel/traps.c:178 [inline] > do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296 > do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 > invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993 > RIP: 0010:format_decode+0x8fc/0xaf0 lib/vsprintf.c:2149 > Code: e8 59 59 c9 fa 41 c6 04 24 12 e9 94 fd ff ff e8 4a 59 c9 fa 0f be f3 > 48 c7 c7 60 bc 89 87 c6 05 28 aa d2 01 01 e8 e4 e9 93 fa <0f> 0b 4d 8b 7d > c0 e9 56 fe ff ff 48 8b bd 68 ff ff ff e8 cd 4f 08 > RSP: 0018:ffff8801b6b27688 EFLAGS: 00010282 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffffffff816422b1 RDI: ffff8801b6b27378 > RBP: ffff8801b6b27730 R08: ffff8801b69a0040 R09: 0000000000000006 > R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801b6b277a8 > R13: ffff8801b6b27708 R14: 0000000000000000 R15: ffff8801b6b27b04 > vsnprintf+0x185/0x1b60 lib/vsprintf.c:2245 > vscnprintf+0x2d/0x80 lib/vsprintf.c:2396 > __trace_array_vprintk.part.60+0xc7/0x330 kernel/trace/trace.c:2990 > __trace_array_vprintk kernel/trace/trace.c:3021 [inline] > trace_array_vprintk kernel/trace/trace.c:3021 [inline] > trace_vprintk+0x5f/0x90 kernel/trace/trace.c:3059 > __trace_printk+0xce/0x120 kernel/trace/trace_printk.c:237 > ____bpf_trace_printk kernel/trace/bpf_trace.c:274 [inline] Looks like a bug in the bpf trace printk code. -- Steve > bpf_trace_printk+0xb16/0xc30 kernel/trace/bpf_trace.c:166 > bpf_prog_e51deac1441bc083+0x94a/0x1000 > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches