From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f80.google.com (mail-oo1-f80.google.com [209.85.161.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A48C431BC8C for ; Mon, 29 Dec 2025 12:52:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767012743; cv=none; b=nK5fzXgJc4mrsbVqkqAegPvee2PUkU/LVGgIaLjfOGqCsjnE+ubli4+njRVhXa562BxWI8z5uaMIxgSiosprb82KLbtY38fbyOjppDq+xUeCgif+qoJTrVFwjSSn5YSb5po5zuZYtjL2dToXL81+1BOlgRQWodkYHyERUbOHCtY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767012743; c=relaxed/simple; bh=UBRuwctfE+/w4I+7KtULzPwZHRE6sVALSgsXQmqdkz8=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=W+XkN4AGFoaj5n86vfUuTjk4+KVew6ftRl4Xd4oP1AnsY4j/Tz5/5v3BmWve9kY+W8yqjiCjHuYQHd6GRd1hj8DzvfbwwK96Njqznw0p8txjGCYoDoQG4w6rjngo8ZZBDTQ3gTBd7HOu9IQf4Ti5kxgPrQy1zGi5OX6uj5JY5lI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.161.80 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oo1-f80.google.com with SMTP id 006d021491bc7-65747d01bb0so15747115eaf.0 for ; Mon, 29 Dec 2025 04:52:21 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767012740; x=1767617540; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=UiPM2cAXyfvdxGowciJiuCa8Xscg+zxabWemcI/m3OM=; b=nJfVWwila45hYUUOI/CCu9C6ezYnK16w0P6SHtckr/tdw1D7Q9k+/ZOX48xDoqPYv0 hhycXM+jKOSUtWr1mTJ10wqpQrAwEBeAkRHv6hPZl3JBCem/Xq3SE7dzQ1cUkhmKqfQ0 6KKBdLPZTC0H9nG9UksvXrwsGnGyjY0XmdRqxKeyhUZAdFR2c/12PJYJ0mHln4S9Pzph UlOvPA3FIykuwkFwik2hzDf8Sx6R3dl9tiLE7ohYFqsC2QshelzZ1CYvPD3c+rg0kLfC A+b+By0lHhTU801b8R4/kaNLWI4Y6o6iVWRKTzV23ve86hmhO6MaSK/ZHOCy4frqmauo oIpw== X-Forwarded-Encrypted: i=1; AJvYcCVsgJwsWcyRO2VuDSNhEUWV1DSd/PfpYuyfG5mmyDx4OpKOj4cfr6yiw0OeUULJzj2NYHYG0wxBcAvmnzg=@vger.kernel.org X-Gm-Message-State: AOJu0YwQXiveA5DG0Fdb2esUNZ7bs13tUKuiJUwc0VdlZlymlvtXlLO9 6Y7xoXLCmGhPXRSkvUgsQkU3NnwakLd55sTtJ3o9b2uygwEVZFE081Qt4dJeZ4sWuWTlBYwCwRk yXXcVKv862/YzS15Dw5b6nmYNXIz8re2ajMoVbI9nPXKQEvZLp9C6yoBEhTY= X-Google-Smtp-Source: AGHT+IHFyrtM2x3EJ5t5V09gwnZNBBTj45c5GUx/lUc44bdMrPqyoDjWpRVLS5oXseEK/PIfX1aAgAB+JAlTVMdnPjcYK2FNNFl3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:16a7:b0:65d:a21:d1ee with SMTP id 006d021491bc7-65d0ea5b641mr14538146eaf.23.1767012740592; Mon, 29 Dec 2025 04:52:20 -0800 (PST) Date: Mon, 29 Dec 2025 04:52:20 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69527984.050a0220.3b1790.000b.GAE@google.com> Subject: [syzbot] [f2fs?] kernel BUG in f2fs_put_super (4) From: syzbot To: chao@kernel.org, jaegeuk@kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: ccd1cdca5cd4 Merge tag 'nfsd-6.19-1' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=136b2f1a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1f2b6fe1fdf1a00b dashboard link: https://syzkaller.appspot.com/bug?extid=c0a575209250b34549be compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f9756bdd2faf/disk-ccd1cdca.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f03680f500a5/vmlinux-ccd1cdca.xz kernel image: https://storage.googleapis.com/syzbot-assets/ed5a6d62c5ac/bzImage-ccd1cdca.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c0a575209250b34549be@syzkaller.appspotmail.com F2FS-fs (loop5): detect filesystem reference count leak during umount, type: 2, count: -1 ------------[ cut here ]------------ kernel BUG at fs/f2fs/super.c:2008! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 5980 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:f2fs_put_super+0x1165/0x1170 fs/f2fs/super.c:2008 Code: fd 41 bf 0c 00 00 00 48 89 df 44 89 fe e8 23 3f 00 00 48 89 df 31 f6 48 c7 c2 00 da 33 8b 44 89 f9 49 89 c0 e8 7c 70 fd ff 90 <0f> 0b 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900056579a0 EFLAGS: 00010246 RAX: b18dcddbdfba5600 RBX: ffff88805e754000 RCX: b18dcddbdfba5600 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90005657b98 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffff52000acaebd R12: ffff88805e754000 R13: dffffc0000000000 R14: 00000000ffffffff R15: 0000000000000002 FS: 000055556c854500(0000) GS:ffff888126cef000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fad42ebb000 CR3: 0000000029164000 CR4: 00000000003526f0 Call Trace: generic_shutdown_super+0x135/0x2c0 fs/super.c:643 kill_block_super+0x44/0x90 fs/super.c:1722 kill_f2fs_super+0x39f/0x6c0 fs/f2fs/super.c:5454 deactivate_locked_super+0xbc/0x130 fs/super.c:474 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1318 task_work_run+0x1d4/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0xef/0x4e0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x2b7/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f142cea0a77 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffc21036858 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f142cf23d7d RCX: 00007f142cea0a77 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc21036910 RBP: 00007ffc21036910 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc210379a0 R13: 00007f142cf23d7d R14: 000000000002714a R15: 00007ffc210379e0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:f2fs_put_super+0x1165/0x1170 fs/f2fs/super.c:2008 Code: fd 41 bf 0c 00 00 00 48 89 df 44 89 fe e8 23 3f 00 00 48 89 df 31 f6 48 c7 c2 00 da 33 8b 44 89 f9 49 89 c0 e8 7c 70 fd ff 90 <0f> 0b 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900056579a0 EFLAGS: 00010246 RAX: b18dcddbdfba5600 RBX: ffff88805e754000 RCX: b18dcddbdfba5600 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90005657b98 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffff52000acaebd R12: ffff88805e754000 R13: dffffc0000000000 R14: 00000000ffffffff R15: 0000000000000002 FS: 000055556c854500(0000) GS:ffff888126def000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fab7d2756c0 CR3: 0000000029164000 CR4: 00000000003526f0 --- 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. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup