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=-4.0 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 55307C433E0 for ; Wed, 5 Aug 2020 18:13:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 348812084D for ; Wed, 5 Aug 2020 18:13:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729195AbgHESNu (ORCPT ); Wed, 5 Aug 2020 14:13:50 -0400 Received: from mail-il1-f198.google.com ([209.85.166.198]:44718 "EHLO mail-il1-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729162AbgHESJX (ORCPT ); Wed, 5 Aug 2020 14:09:23 -0400 Received: by mail-il1-f198.google.com with SMTP id y82so26450277ilk.11 for ; Wed, 05 Aug 2020 11:09:23 -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=YloGL6E01nHExHJj20pzTeVaG7arypuWNvc/TTQM6GU=; b=m4v0HvcvxZyyRqXzpC5ZajM9cbr4OVej7m0RjCcnoWlyOp7ODReW/1kCbpOORUD7Qx a2JVuGtMmdZ6ZKhjJ6CFH5k5Ef4poNu7KeP95yVbdaR8qFIkkuMUmNZGcLXxZQGIJVMJ InovqNEoV+EDUgaOr6SzEPtxXJJvLzEoa73lkNGJHYGCTgONZ+ey4Z+YJ/sUmL9PTKxQ n3XdjIbHF4Lw/A+UeiwDt3T1vZYwWsJ0+HyrAs3twuVYb3k5Evf3v1Uce3xj3dIJ0/Tm X2LG2txnwXqmxOApQH+Fy9Sbm3xuIu8BSgjLZNakzui4Rch+2ffkOYTg+QclsTgZl3pq b+nQ== X-Gm-Message-State: AOAM530MNV+hz2vHre66XfO+TZFufJJEVBVAjFvwyHKOjHnoiB9xOWyw /Q0A5ziyBKFAW79hICiZWwb7XXTzimYnqdCDDEkG0/6eQMI/ X-Google-Smtp-Source: ABdhPJxKKv7Wr77Bbzsv5urdfzRqc3Ro2et+RbGkg6ws9iwd9GeFuikYIHMlqbLtnzqWa1N3LL1eyj/v5jRCbV2oUEfjHNWPBA2z MIME-Version: 1.0 X-Received: by 2002:a05:6638:2493:: with SMTP id x19mr5753725jat.53.1596650962939; Wed, 05 Aug 2020 11:09:22 -0700 (PDT) Date: Wed, 05 Aug 2020 11:09:22 -0700 In-Reply-To: <000000000000b087a705ac2369dd@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000079f28205ac254528@google.com> Subject: Re: INFO: trying to register non-static key in l2cap_chan_del From: syzbot To: davem@davemloft.net, johan.hedberg@gmail.com, kuba@kernel.org, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, marcel@holtmann.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found a reproducer for the following issue on: HEAD commit: 4c900a6b farsync: switch from 'pci_' to 'dma_' API git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=1561801a900000 kernel config: https://syzkaller.appspot.com/x/.config?x=91a13b78c7dc258d dashboard link: https://syzkaller.appspot.com/bug?extid=abfc0f5e668d4099af73 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15bdcc3a900000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+abfc0f5e668d4099af73@syzkaller.appspotmail.com INFO: trying to register non-static key. the code is fine but needs lockdep annotation. turning off the locking correctness validator. CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events l2cap_chan_timeout Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 assign_lock_key kernel/locking/lockdep.c:894 [inline] register_lock_class+0x157d/0x1630 kernel/locking/lockdep.c:1206 __lock_acquire+0xfa/0x56e0 kernel/locking/lockdep.c:4259 lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:4959 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:358 [inline] lock_sock_nested+0x3b/0x110 net/core/sock.c:3019 l2cap_sock_teardown_cb+0x88/0x400 net/bluetooth/l2cap_sock.c:1520 l2cap_chan_del+0xad/0x1300 net/bluetooth/l2cap_core.c:618 l2cap_chan_close+0x118/0xb10 net/bluetooth/l2cap_core.c:823 l2cap_chan_timeout+0x173/0x450 net/bluetooth/l2cap_core.c:436 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 BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 0 P4D 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events l2cap_chan_timeout RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffffc90000cbfb60 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8880931bd000 RCX: ffffffff8728bc2f RDX: 1ffff11014549a8c RSI: ffffffff8728be7c RDI: ffff8880a2a4d000 RBP: 0000000000000005 R08: 0000000000000001 R09: ffff8880a2a4d067 R10: 0000000000000009 R11: 0000000000000001 R12: 000000000000006f R13: ffff8880a2a4d000 R14: 0000000000000000 R15: 0000000000000005 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000000929e6000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: l2cap_sock_teardown_cb+0x374/0x400 net/bluetooth/l2cap_sock.c:1547 l2cap_chan_del+0xad/0x1300 net/bluetooth/l2cap_core.c:618 l2cap_chan_close+0x118/0xb10 net/bluetooth/l2cap_core.c:823 l2cap_chan_timeout+0x173/0x450 net/bluetooth/l2cap_core.c:436 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 Modules linked in: CR2: 0000000000000000 ---[ end trace ecb0577583d92fc1 ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffffc90000cbfb60 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8880931bd000 RCX: ffffffff8728bc2f RDX: 1ffff11014549a8c RSI: ffffffff8728be7c RDI: ffff8880a2a4d000 RBP: 0000000000000005 R08: 0000000000000001 R09: ffff8880a2a4d067 R10: 0000000000000009 R11: 0000000000000001 R12: 000000000000006f R13: ffff8880a2a4d000 R14: 0000000000000000 R15: 0000000000000005 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000000929e6000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400