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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,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 DBA24C10F00 for ; Sat, 7 Mar 2020 05:37:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B0DB32070A for ; Sat, 7 Mar 2020 05:37:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726065AbgCGFhM (ORCPT ); Sat, 7 Mar 2020 00:37:12 -0500 Received: from mail-io1-f71.google.com ([209.85.166.71]:40170 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725815AbgCGFhM (ORCPT ); Sat, 7 Mar 2020 00:37:12 -0500 Received: by mail-io1-f71.google.com with SMTP id m24so2952088iol.7 for ; Fri, 06 Mar 2020 21:37:11 -0800 (PST) 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:message-id:subject:from:to; bh=eYtk3rQEQHCx97BmdiVJM4sE2ubHvgbTjthfSQssYOk=; b=uaoYg3CxTnu2+7b2pB4uvXr6Y/7a4T2+dJvBPJnVw+u0S2Gr5UqKw2n9ssP19m/314 1hLbowSGYXDrSEgEdaL6r8FUOo/O935r201G5PI7yyfnZvrnwwPqqzRzZAVGalBdOLkY cns3UMZ5fSrGbDLccLdgN8czxeaT5oPEM3OPx7QTV0VRihLWwiaCPP/DHXXEEjaCSF/G virAikc/v9lHxehXN5rszSOhpSZWHFWmnkiCuBPbAg4Yv8udvzMdSQZpMbU9xfUoKV22 YPV4DLT7kVewSlQXvDiaeKoa13lBRFqA/ALS9WK/kSi5l0HSes0PL3mWtrj6f5fA61zS GlIg== X-Gm-Message-State: ANhLgQ1YQ2eO968ImCcE3ms5zukaGbPTzKv1Dy9KocOM37Cya4KP3PrC mv0WW0BRFSJCrUcCcAxqEhCAZ5LI8vmgxAwMnLMrLbwZfaGN X-Google-Smtp-Source: ADFU+vsnEVQxnDRCZnfjAcza9jyxAXlBqnr7xycVfA41Ci9jJ/E1lGWx3ETO5q28bSyYgHJxSRFXfFlexndfPU4YpDO/lQJhIHEN MIME-Version: 1.0 X-Received: by 2002:a5e:9e45:: with SMTP id j5mr5814160ioq.179.1583559431284; Fri, 06 Mar 2020 21:37:11 -0800 (PST) Date: Fri, 06 Mar 2020 21:37:11 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000061ed2e05a03d2949@google.com> Subject: WARNING: locking bug in process_one_work From: syzbot To: linux-kernel@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 Hello, syzbot found the following crash on: HEAD commit: 63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=155d3529e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=5d2e033af114153f dashboard link: https://syzkaller.appspot.com/bug?extid=5396b943a2f03ed3d510 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+5396b943a2f03ed3d510@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 0 PID: 2895 at kernel/locking/lockdep.c:840 look_up_lock_class+0x1ac/0x2a0 kernel/locking/lockdep.c:839 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 2895 Comm: kworker/0:41 Not tainted 5.6.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: rcu_gp srcu_invoke_callbacks Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fb/0x318 lib/dump_stack.c:118 panic+0x264/0x7a9 kernel/panic.c:221 __warn+0x209/0x210 kernel/panic.c:582 report_bug+0x1b6/0x2f0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0xcf/0x1c0 arch/x86/kernel/traps.c:267 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:look_up_lock_class+0x1ac/0x2a0 kernel/locking/lockdep.c:839 Code: 57 00 4c 3b 33 74 7d 48 8b 45 c8 42 80 3c 28 00 48 8b 5d d0 74 08 48 89 df e8 00 9c 57 00 48 c7 c0 30 08 a0 89 48 39 03 74 5a <0f> 0b eb 56 e8 8b 0e 41 02 45 31 e4 48 c7 c7 4f 3f e5 88 44 89 fe RSP: 0018:ffffc90008f3fa10 EFLAGS: 00010002 RAX: ffffffff89a00830 RBX: ffffc90008f3fd78 RCX: ffffc90008f3fd78 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90008f3fd78 RBP: ffffc90008f3fa48 R08: 0000000000000001 R09: 0000000000000000 R10: fffffbfff12d372d R11: 0000000000000000 R12: ffffffff89c2f670 R13: dffffc0000000000 R14: ffffffff88e58667 R15: 0000000000000000 register_lock_class+0x99/0xeb0 kernel/locking/lockdep.c:1184 __lock_acquire+0x116/0x1bc0 kernel/locking/lockdep.c:3836 lock_acquire+0x154/0x250 kernel/locking/lockdep.c:4484 process_one_work+0x7c8/0x10f0 kernel/workqueue.c:2240 worker_thread+0xbbc/0x1630 kernel/workqueue.c:2410 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 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#status for how to communicate with syzbot.