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=-9.0 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, 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 9D5D0C433E1 for ; Mon, 13 Jul 2020 08:05:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7868E2073A for ; Mon, 13 Jul 2020 08:05:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728571AbgGMIFT (ORCPT ); Mon, 13 Jul 2020 04:05:19 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:48678 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725969AbgGMIFT (ORCPT ); Mon, 13 Jul 2020 04:05:19 -0400 Received: by mail-io1-f71.google.com with SMTP id r9so7571479ioa.15 for ; Mon, 13 Jul 2020 01:05:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=21l/VJU15KAsnv6DFGRRcwLsfDDBxLOaO9Owh599Apk=; b=ommoKmrdDE70cmprj+Jnf7CzHrl7uEGFcMfobwA+bQHJJcc67r4PR+ibA+Z4smeH3h VPIode8lFNc677MIgKJs3LO6gdYgDKRlAebbU4ibJ9nLXr35HLr8Nj3RWl0c1YUX4e4Y ve+hHesl/J2vKvcJ+WxqjgdQgL2bwP+CNQmLHbPAXElTj0Btol9oIqYgvuiS5b3OJh96 3WAfapK8WTc0Obrjcv4p+cwDGZMkxNO6DxXE8O8SIvExtuqXk/ykO5AYexv/nc0405sr qoIkq0WckzKlV+d1Sva1+sK2eU7n/UuijT96dyCezIbrE3aEE4hpY9QKwW43fx8c5HGH EkBA== X-Gm-Message-State: AOAM530bxaSwGGiji8LtAbUVB2dmclAk1SKVYSz+rNjr+EWDU3GFcao0 Mr7MdPfWMXubrVJEH4IgsTWYZEYES7go4nghGlvoi+gdXFSV X-Google-Smtp-Source: ABdhPJyBTWanyyS9AkrkocASW9iTXQVQVoUAT/nfbhm2a2oxMn8CtwX8bai8tBU+PpeR+VSF1pbBo3d2ffHh9pFwrYPfOtaTfzst MIME-Version: 1.0 X-Received: by 2002:a05:6638:236:: with SMTP id f22mr90526977jaq.18.1594627518110; Mon, 13 Jul 2020 01:05:18 -0700 (PDT) Date: Mon, 13 Jul 2020 01:05:18 -0700 In-Reply-To: <000000000000d411cf05a8ffc4a6@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000c421ef05aa4e2649@google.com> Subject: Re: WARNING: suspicious RCU usage in tipc_l2_send_msg From: syzbot To: davem@davemloft.net, jmaloy@redhat.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, tipc-discussion@lists.sourceforge.net, ying.xue@windriver.com Content-Type: text/plain; charset="UTF-8" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: 4437dd6e Merge tag 'io_uring-5.8-2020-07-12' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17b7869f100000 kernel config: https://syzkaller.appspot.com/x/.config?x=66ad203c2bb6d8b dashboard link: https://syzkaller.appspot.com/bug?extid=47bbc6b678d317cccbe0 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10c005af100000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+47bbc6b678d317cccbe0@syzkaller.appspotmail.com ============================= WARNING: suspicious RCU usage 5.8.0-rc4-syzkaller #0 Not tainted ----------------------------- net/tipc/bearer.c:466 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 2 locks held by kworker/0:1/12: #0: ffff88821adc9538 ((wq_completion)cryptd){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88821adc9538 ((wq_completion)cryptd){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff88821adc9538 ((wq_completion)cryptd){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff88821adc9538 ((wq_completion)cryptd){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff88821adc9538 ((wq_completion)cryptd){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff88821adc9538 ((wq_completion)cryptd){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc90000d2fda8 ((work_completion)(&cpu_queue->work)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 stack backtrace: CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.8.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: cryptd cryptd_queue_worker Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 tipc_l2_send_msg+0x354/0x420 net/tipc/bearer.c:466 tipc_aead_encrypt_done+0x204/0x3a0 net/tipc/crypto.c:761 cryptd_aead_crypt+0xe8/0x1d0 crypto/cryptd.c:739 cryptd_queue_worker+0x118/0x1b0 crypto/cryptd.c:181 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293