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=-3.7 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 E01AFC43457 for ; Wed, 14 Oct 2020 12:12:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8CCF620848 for ; Wed, 14 Oct 2020 12:12:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729298AbgJNMMS (ORCPT ); Wed, 14 Oct 2020 08:12:18 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:39598 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726684AbgJNMMS (ORCPT ); Wed, 14 Oct 2020 08:12:18 -0400 Received: by mail-il1-f200.google.com with SMTP id r10so2233110ilq.6 for ; Wed, 14 Oct 2020 05:12:17 -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:message-id:subject:from:to; bh=zg+I8d7ndikJ7TpxgGlYT9fzJHpVC4H6Dh85V9obOeM=; b=uIO5faYGNCPlHeaGER7XTMZD7Q8+Z9+UMEWDUMun8DlJmw8RyVKbSkndOSQdH78lkD sLAnIyT248bMQrn8n71Es7C1ajT+qwNEMwcmkDXeykVOmh3yVOccOgo77nGlgvcaU5ZP yrvGpQ+qyCdGMaw09cY2Yh0kQS6uu41k9Hg59fEBBJIg7klQ6NgiCVQN2g2Uh8sH4QqT XVLlqEEgVxRe7kjgddaAmkJf6cuu6Tvo8e5Jj0Meu5brpXSuMe1UjUiTGjh0kx+DQIjL NyqF72TiwAkkTlGxNcXlIEOIxAg3XBv7m1pbzq5ejbCqSfnxeKRA6xs08hkCSggbXtyS AkyA== X-Gm-Message-State: AOAM531x45gFpMzGtb3+mTQUkA3lzXp4RWMu6FjQLC6C1vzhlcvArOVl Kq60n2O1UHqzo+5wYgumTzrQEKNNBZEGOb35Jp9jejnSFGXf X-Google-Smtp-Source: ABdhPJzRW7x0/xlervt4O2pE68CaIIdEKA1VQFrZob2AbSmj39suHSe9DEIiaQwntmUbHW3aGq5XiLTagbrw77a+fKZ0sJf2cLXK MIME-Version: 1.0 X-Received: by 2002:a92:c88e:: with SMTP id w14mr3290219ilo.185.1602677536914; Wed, 14 Oct 2020 05:12:16 -0700 (PDT) Date: Wed, 14 Oct 2020 05:12:16 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000004702c605b1a0717e@google.com> Subject: WARNING in cleanup_mnt (2) From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: bbf5c979 Linux 5.9 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15498ffb900000 kernel config: https://syzkaller.appspot.com/x/.config?x=3d8333c88fe898d7 dashboard link: https://syzkaller.appspot.com/bug?extid=428c51fcb8f9e5a84850 compiler: gcc (GCC) 10.1.0-syz 20200507 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+428c51fcb8f9e5a84850@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 1 PID: 30737 at fs/namespace.c:1109 cleanup_mnt+0x409/0x530 fs/namespace.c:1109 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 30737 Comm: syz-executor.3 Not tainted 5.9.0-syzkaller #0 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+0x198/0x1fd lib/dump_stack.c:118 panic+0x382/0x7fb kernel/panic.c:231 __warn.cold+0x20/0x4b kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536 RIP: 0010:cleanup_mnt+0x409/0x530 fs/namespace.c:1109 Code: 8a e8 9b c0 0c 02 49 8d 7c 24 38 48 c7 c6 80 4a ca 81 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f e9 ec 9c 98 ff e8 f7 9f ab ff <0f> 0b e9 0a fd ff ff e8 eb 9f ab ff 4c 89 e7 e8 43 03 06 00 e9 2f RSP: 0018:ffffc900163afac0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff81ca9c21 RDX: ffff88809201a2c0 RSI: ffffffff81ca9f19 RDI: 0000000000000005 RBP: 0000000000000040 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880889c0540 R13: 000000000000042b R14: 0000000000000007 R15: 0000000000000002 task_work_run+0xdd/0x190 kernel/task_work.c:141 exit_task_work include/linux/task_work.h:25 [inline] do_exit+0xb7d/0x29f0 kernel/exit.c:806 do_group_exit+0x125/0x310 kernel/exit.c:903 get_signal+0x428/0x1f00 kernel/signal.c:2757 arch_do_signal+0x82/0x2520 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x1ae/0x200 kernel/entry/common.c:192 syscall_exit_to_user_mode+0x7e/0x2e0 kernel/entry/common.c:267 __do_fast_syscall_32+0x6c/0x90 arch/x86/entry/common.c:138 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f06549 Code: Bad RIP value. RSP: 002b:00000000090bfbfc EFLAGS: 00000212 ORIG_RAX: 0000000000000006 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000000 RDX: 0000000000000005 RSI: 0000000008bab680 RDI: 0000000008bab680 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds.. --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.