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 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 8E596C433E0 for ; Tue, 19 Jan 2021 11:07:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 44A30208D5 for ; Tue, 19 Jan 2021 11:07:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389740AbhASK7a (ORCPT ); Tue, 19 Jan 2021 05:59:30 -0500 Received: from mail-io1-f69.google.com ([209.85.166.69]:56627 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387728AbhASKtj (ORCPT ); Tue, 19 Jan 2021 05:49:39 -0500 Received: by mail-io1-f69.google.com with SMTP id m2so34363509iow.23 for ; Tue, 19 Jan 2021 02:48:43 -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=BNpQVX1O+cyOBMkR/TOJl1Zoq0gO8cOFzbu0wo8ajm0=; b=eOvj8DPcks7Dw1Tjm424ir+ioMwwLT9Ec3JxGafxPxKC8Fk99AWBn2mDvx/Xu6rgzG R5oEFa1FK2fDsp1zAb1P6ZryM4+sAOG4fR3Rgu2bdmWfhTSsECIkq7xoC04UnoAfITxw 0/S4Pko7/U9OSJcH1FDleDpukYImJv7Odzis8kevNQL6YjeYCPyNnIAP+E8EmUy9gi6M xjYWU7oiq/Cxur5f7CdMcsjA50F/N81YSk/TEXXqmz9Sun/9VfIThNu9si/hJe5pGBGU 3oLzHTdTlMBynsyr/Q/5VXYDOTs6j/NaRVNmhKRiTcQdJopVTxLUMTtho1RyHUenv7Uz //AA== X-Gm-Message-State: AOAM533w8QFvaBcei1o5fY5453qQmLAqcUWjPKAGlgVd6bC6RKA6MrjL dwYySngLiA+ZZ0bxFY1//+xWb7yeG3hXO6xungcKos6+7Pyj X-Google-Smtp-Source: ABdhPJwRZGICyAc9YguweoA/wKY6u6SOwFq+oTtQJm/1QiI83UN8virOQhf9L37lRF2ihWnI28mucskkdNWBC+/E1HBw5hcBKcrH MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1c8d:: with SMTP id w13mr2751807ill.301.1611053297346; Tue, 19 Jan 2021 02:48:17 -0800 (PST) Date: Tue, 19 Jan 2021 02:48:17 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000080aeb405b93e9309@google.com> Subject: WARNING in mntput_no_expire 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-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: b3a3cbde Add linux-next specific files for 20210115 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=10e9fb98d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=6ea08dae6aab586f dashboard link: https://syzkaller.appspot.com/bug?extid=c19357b59a4b43938b97 compiler: gcc (GCC) 10.1.0-syz 20200507 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+c19357b59a4b43938b97@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 0 PID: 8486 at fs/namespace.c:1160 mntput_no_expire+0xb47/0xd40 fs/namespace.c:1160 Modules linked in: CPU: 0 PID: 8486 Comm: syz-executor.2 Not tainted 5.11.0-rc3-next-20210115-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:mntput_no_expire+0xb47/0xd40 fs/namespace.c:1160 Code: ff 48 c7 c2 a0 b5 58 89 be c2 02 00 00 48 c7 c7 60 b5 58 89 c6 05 ef f5 25 0b 01 e8 6b e0 f0 06 e9 3f fd ff ff e8 49 5a a9 ff <0f> 0b e9 fc fc ff ff e8 3d 5a a9 ff e8 98 97 95 ff 31 ff 89 c5 89 RSP: 0018:ffffc900016cfcf8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 1ffff920002d9fa5 RCX: 0000000000000000 RDX: ffff88801b0e8000 RSI: ffffffff81c9aec7 RDI: 0000000000000003 RBP: ffff8880136e9000 R08: 0000000000000000 R09: ffffffff8ed3d86f R10: ffffffff81c9abc1 R11: 0000000000000001 R12: 0000000000000008 R13: ffffc900016cfd48 R14: dffffc0000000000 R15: 00000000ffffffff FS: 00000000019ec940(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffdd486d7c CR3: 0000000051c48000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: path_umount+0x7c9/0x1240 fs/namespace.c:1739 ksys_umount fs/namespace.c:1758 [inline] __do_sys_umount fs/namespace.c:1763 [inline] __se_sys_umount fs/namespace.c:1761 [inline] __x64_sys_umount+0x159/0x180 fs/namespace.c:1761 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x460c47 Code: 64 89 04 25 d0 02 00 00 58 5f ff d0 48 89 c7 e8 2f be ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fffdd487488 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000460c47 RDX: 00000000004033a8 RSI: 0000000000000002 RDI: 00007fffdd487530 RBP: 00000000000456eb R08: 0000000000000000 R09: 000000000000000b R10: 0000000000000005 R11: 0000000000000246 R12: 00007fffdd4885e0 R13: 00000000019eda60 R14: 0000000000000000 R15: 0000000000045444 --- 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.