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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A401AC433F5 for ; Sat, 11 Dec 2021 22:04:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231493AbhLKWEX (ORCPT ); Sat, 11 Dec 2021 17:04:23 -0500 Received: from mail-il1-f200.google.com ([209.85.166.200]:36603 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229605AbhLKWEW (ORCPT ); Sat, 11 Dec 2021 17:04:22 -0500 Received: by mail-il1-f200.google.com with SMTP id y15-20020a056e02174f00b002a4222f24a5so12792950ill.3 for ; Sat, 11 Dec 2021 14:04:22 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=31ZnY55RFUp+GSZ4GBgxn8B/M7nKKxdMX7CbhSvMYSI=; b=0WXm2ieff2JwKG8LiE5HKnP3iv7f6tVYRcTYvk+HnCzq3/AIgwXRY+/0Bvo2I3c6Sy ofL+oM1qvNAXjsfhy5t/wCZdCFnFjb2QpkzsJfFpFjwP2D/JZwoaJr+ZqoLg34zv3DtX QS0UfZLEt/cHm638+x0oFiRfGD+qiThAZTXooz1UrlOoqC63mY2y0qVIdb7EbTqiLGSn Ce6f2d95ymd9DDUU7OL5WTq97+xkzgtRs1FZZu8qfWJ8wb02riMQ4kyQmR3WEoe1DZ4I ELGPV91BfO3ejBzTC2I05ndwypwedAqG/5S6g7pHvlky6Ua3delzUz2g9ldFhm275gBo 3Skg== X-Gm-Message-State: AOAM530HDnAPOVA9G3OtX3vVthwijoSz9ly3TFA4YvsBoPXCA7dc5nt2 NNYbsf+7V1Ox/cF+itOuIf67AYL/Oo+yOH56m99sABQMSPgJ X-Google-Smtp-Source: ABdhPJzUMJWKdauYpJPL8xZ4g221gRRdIbAR8sRmFOqXTCpVmPOeKmuzXgn75jEla4APahQV3JImixl9pqF4gd7D7xpGQQ5zFhvm MIME-Version: 1.0 X-Received: by 2002:a05:6602:218d:: with SMTP id b13mr27860356iob.19.1639260261717; Sat, 11 Dec 2021 14:04:21 -0800 (PST) Date: Sat, 11 Dec 2021 14:04:21 -0800 In-Reply-To: <00000000000069e12f05d0b78c2d@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000981d5005d2e60598@google.com> Subject: Re: [syzbot] BUG: MAX_LOCKDEP_CHAINS too low! (3) From: syzbot To: akpm@linux-foundation.org, andrii@kernel.org, andy@greyhouse.net, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, glider@google.com, hawk@kernel.org, j.vosburgh@gmail.com, john.fastabend@gmail.com, john.ogness@linutronix.de, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pmladek@suse.com, rdunlap@infradead.org, songliubraving@fb.com, swboyd@chromium.org, syzkaller-bugs@googlegroups.com, vfalico@gmail.com, yhs@fb.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found a reproducer for the following issue on: HEAD commit: 6f513529296f Merge tag 'for-5.16-rc4-tag' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10a8954db00000 kernel config: https://syzkaller.appspot.com/x/.config?x=221ffc09e39ebbd1 dashboard link: https://syzkaller.appspot.com/bug?extid=8a249628ae32ea7de3a2 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12777551b00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15a99a05b00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8a249628ae32ea7de3a2@syzkaller.appspotmail.com BUG: MAX_LOCKDEP_CHAINS too low! turning off the locking correctness validator. CPU: 0 PID: 6709 Comm: kworker/u4:7 Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bond1948 bond_netdev_notify_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 add_chain_cache kernel/locking/lockdep.c:3649 [inline] lookup_chain_cache_add kernel/locking/lockdep.c:3748 [inline] validate_chain kernel/locking/lockdep.c:3769 [inline] __lock_acquire.cold+0x372/0x3ab kernel/locking/lockdep.c:5027 lock_acquire kernel/locking/lockdep.c:5637 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 process_one_work+0x921/0x1690 kernel/workqueue.c:2274 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295