From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f208.google.com (mail-oi1-f208.google.com [209.85.167.208]) (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 A36F2259CB9 for ; Mon, 8 Dec 2025 07:52:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765180349; cv=none; b=bbE/DZEItXI9JJRzW+iSbREBmtwNVNEN1YApW7Lp76+fN6WlXFA2Jpzj5H2cS5LpaNDAaIVDdo1eDjhxx5bAYZPsh4aA3aRkvcaXk22HQlqYvt+ywaxrwNLurA1dJuuSUSyEypW7rKhbu8fI8D8ko1kApP68LfXFwDSdt+f7EpY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765180349; c=relaxed/simple; bh=PgKGT4CgWdgN4KZI6XZK4LJPlmiToK0yil7R1lkWaAs=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=bD4w+bGsrHkLADoNH3MEFAUviuyL9PEPO1WPmD+HquSLgj2DQL+lTmwFW/2s8cnHto4TgxcuIulIjvfBTeSsSzvNcMPciuXkGAMSQRtMr718MNq0AYqAa2wTVcSWge/336ebnBQ2niqNXPabCCPH4oAK9yRxE6W/A4Icq2qITSc= 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=209.85.167.208 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-oi1-f208.google.com with SMTP id 5614622812f47-4501b05fcf1so2763697b6e.3 for ; Sun, 07 Dec 2025 23:52:27 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765180347; x=1765785147; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=fqlTZgXUj5NUCTKw8O39U5hGtQEqHcF5ohvB94zKBCo=; b=v5cEQjdKcBeMd7aEFAHnmKdOJ7GRYWtp6zrvPY5sx+0Q6s1tLlrYnDXccyembvr18c GCpu8QRIs1rgXhOzgAlEkYKJKjQCGn8H3gueAIzbQBFltHsPZxU9sWTjXG9SobJczwni pQ3ogQkqp4ekQ7BHGCmWO2V4Izvg4sEoMtEglw5AZ4L3s3KvTcI0MeoZOwP/e2GgKnhM 1sYSE3EOIZZf2leud76pWwkB47NlYN6klhpDYd4qoLPMhejwLTm9jDagCIISXHXRzrJT eckqbxfx3LTAhPBOnLR/A87VJm+k4Qnfc9LFX/3DA4PuOzlmvewmTUIFh105jKzdm0Z5 HbVw== X-Forwarded-Encrypted: i=1; AJvYcCXBXho+ygxqXndL9YDChGqJBMLoosu8cyFBVVxnFlDTOIJsHhHYCV+e1aKKahGQDX3DJJwDMdFOxUp7UuE=@vger.kernel.org X-Gm-Message-State: AOJu0Yxo3wLQAMh6sjAEyMUaEBqyInA+ZM+JluOD4SklOOBIOomTsUnw M7ZVxiTLXvzaQdAZ6PXW5JScTug5wX9dNxgpcPsdTliO7G2L0dHCnkazLgD6wGgRO6Z4Nu7Tkmq K1nBHm2jmMg/2I4Xn1tch0AjF7rhlda+VILQqax9GDlQvkS4xI65VPgQviH4= X-Google-Smtp-Source: AGHT+IEq+hHd0j1mdwHlG8tRj0iIKYmLJ3osSIKsAcFG72r8xw3V2y0y7CuUFYlxBUoTuhma51FUykbJ4lXLRvs65nw0qhNJ76O/ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:174a:b0:659:9a49:90bd with SMTP id 006d021491bc7-6599a968357mr2917963eaf.60.1765180346830; Sun, 07 Dec 2025 23:52:26 -0800 (PST) Date: Sun, 07 Dec 2025 23:52:26 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <693683ba.a70a0220.38f243.0091.GAE@google.com> Subject: [syzbot] [btrfs?] kernel BUG in btrfs_qgroup_inherit From: syzbot To: clm@fb.com, dsterba@suse.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, 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: 416f99c3b16f Merge tag 'driver-core-6.19-rc1' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12ed421a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f5a0bcda07a0bfd7 dashboard link: https://syzkaller.appspot.com/bug?extid=b44d4a4885bc82af2a06 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12770eb4580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=148bbc1a580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-416f99c3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/fb10fdbc0d42/vmlinux-416f99c3.xz kernel image: https://storage.googleapis.com/syzbot-assets/f277b82f7dd0/bzImage-416f99c3.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/11aaebf70e5c/mount_0.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=176f4992580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b44d4a4885bc82af2a06@syzkaller.appspotmail.com R13: 00007f24f59e5fa0 R14: 00007f24f59e5fa0 R15: 0000000000000003 assertion failed: prealloc == NULL :: 0, in fs/btrfs/qgroup.c:3529 ------------[ cut here ]------------ kernel BUG at fs/btrfs/qgroup.c:3529! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5562 Comm: syz.0.19 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:btrfs_qgroup_inherit+0x2892/0x28a0 fs/btrfs/qgroup.c:3529 Code: ff ff e8 d1 1f d4 fd 48 c7 c7 a0 e5 b0 8b 48 c7 c6 00 e6 b0 8b 31 d2 48 c7 c1 20 e2 b0 8b 41 b8 c9 0d 00 00 e8 ef 58 3a fd 90 <0f> 0b 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000cbe7740 EFLAGS: 00010246 RAX: 0000000000000042 RBX: 0000000000000000 RCX: b3bb6c739819f900 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffffc9000cbe7990 R08: ffffc9000cbe7467 R09: 1ffff9200197ce8c R10: dffffc0000000000 R11: fffff5200197ce8d R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 00000000fffffff4 FS: 0000555588ca7500(0000) GS:ffff88808d679000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31b63fff CR3: 0000000011fab000 CR4: 0000000000352ef0 Call Trace: create_subvol+0x5ad/0x18f0 fs/btrfs/ioctl.c:570 btrfs_mksubvol+0x6e4/0x12c0 fs/btrfs/ioctl.c:928 __btrfs_ioctl_snap_create+0x2b2/0x730 fs/btrfs/ioctl.c:1201 btrfs_ioctl_snap_create+0x131/0x180 fs/btrfs/ioctl.c:1259 btrfs_ioctl+0xb4d/0xd00 fs/btrfs/ioctl.c:-1 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f24f578f7c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc9b4adc18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f24f59e5fa0 RCX: 00007f24f578f7c9 RDX: 0000200000000280 RSI: 000000005000940e RDI: 0000000000000003 RBP: 00007ffc9b4adc70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007f24f59e5fa0 R14: 00007f24f59e5fa0 R15: 0000000000000003 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:btrfs_qgroup_inherit+0x2892/0x28a0 fs/btrfs/qgroup.c:3529 Code: ff ff e8 d1 1f d4 fd 48 c7 c7 a0 e5 b0 8b 48 c7 c6 00 e6 b0 8b 31 d2 48 c7 c1 20 e2 b0 8b 41 b8 c9 0d 00 00 e8 ef 58 3a fd 90 <0f> 0b 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000cbe7740 EFLAGS: 00010246 RAX: 0000000000000042 RBX: 0000000000000000 RCX: b3bb6c739819f900 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffffc9000cbe7990 R08: ffffc9000cbe7467 R09: 1ffff9200197ce8c R10: dffffc0000000000 R11: fffff5200197ce8d R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 00000000fffffff4 FS: 0000555588ca7500(0000) GS:ffff88808d679000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31b63fff CR3: 0000000011fab000 CR4: 0000000000352ef0 --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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