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    Subject[syzbot] [btrfs?] kernel BUG in __extent_writepage_io
    From
    Hello,

    syzbot found the following issue on:

    HEAD commit: 8bc9e6515183 Merge tag 'devicetree-for-6.7' of git://git.k..
    git tree: upstream
    console output: https://syzkaller.appspot.com/x/log.txt?x=10e087a0e80000
    kernel config: https://syzkaller.appspot.com/x/.config?x=c3aadb4391bbacce
    dashboard link: https://syzkaller.appspot.com/bug?extid=06006fc4a90bff8e8f17
    compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

    Unfortunately, I don't have any reproducer for this issue yet.

    Downloadable assets:
    disk image: https://storage.googleapis.com/syzbot-assets/6c9b9f6781b1/disk-8bc9e651.raw.xz
    vmlinux: https://storage.googleapis.com/syzbot-assets/44acae63a945/vmlinux-8bc9e651.xz
    kernel image: https://storage.googleapis.com/syzbot-assets/f0058df8ab69/bzImage-8bc9e651.xz

    IMPORTANT: if you fix the issue, please add the following tag to the commit:
    Reported-by: syzbot+06006fc4a90bff8e8f17@syzkaller.appspotmail.com

    assertion failed: block_start != EXTENT_MAP_HOLE, in fs/btrfs/extent_io.c:1351
    ------------[ cut here ]------------
    kernel BUG at fs/btrfs/extent_io.c:1351!
    invalid opcode: 0000 [#1] PREEMPT SMP KASAN
    CPU: 0 PID: 6580 Comm: syz-executor.3 Not tainted 6.6.0-syzkaller-06824-g8bc9e6515183 #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
    RIP: 0010:__extent_writepage_io+0xcce/0xcf0 fs/btrfs/extent_io.c:1351
    Code: 18 83 70 07 0f 0b e8 a1 0c f2 fd 48 c7 c7 c0 b6 8b 8b 48 c7 c6 c0 c3 8b 8b 48 c7 c2 60 b6 8b 8b b9 47 05 00 00 e8 f2 82 70 07 <0f> 0b e8 7b 0c f2 fd 48 8b 3c 24 e8 82 2a 01 00 48 89 c7 48 c7 c6
    RSP: 0018:ffffc90003eef3a0 EFLAGS: 00010246
    RAX: 000000000000004e RBX: 0000000000000000 RCX: f5edcbbfef5d6800
    RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
    RBP: fffffffffffffffd R08: ffffffff81717a4c R09: 1ffff920007dde14
    R10: dffffc0000000000 R11: fffff520007dde15 R12: 0000000000002000
    R13: 0000000000002000 R14: ffffea0000db97e8 R15: ffff88801ce9b4e0
    FS: 00007f2d500396c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00007f9b8a757f28 CR3: 0000000062c62000 CR4: 00000000003506f0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
    <TASK>
    __extent_writepage fs/btrfs/extent_io.c:1441 [inline]
    extent_write_cache_pages fs/btrfs/extent_io.c:2103 [inline]
    extent_writepages+0x149b/0x2e50 fs/btrfs/extent_io.c:2225
    do_writepages+0x3a6/0x670 mm/page-writeback.c:2553
    filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:390
    __filemap_fdatawrite_range mm/filemap.c:423 [inline]
    __filemap_fdatawrite mm/filemap.c:429 [inline]
    filemap_flush+0x11e/0x170 mm/filemap.c:456
    btrfs_release_file+0x117/0x130 fs/btrfs/file.c:1726
    __fput+0x3cc/0xa10 fs/file_table.c:394
    task_work_run+0x24a/0x300 kernel/task_work.c:180
    get_signal+0x166e/0x1840 kernel/signal.c:2691
    arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309
    exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
    exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
    __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
    syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296
    do_syscall_64+0x50/0x110 arch/x86/entry/common.c:88
    entry_SYSCALL_64_after_hwframe+0x63/0x6b
    RIP: 0033:0x7f2d4f27cae9
    Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
    RSP: 002b:00007f2d500390c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
    RAX: fffffffffffffffc RBX: 00007f2d4f39c120 RCX: 00007f2d4f27cae9
    RDX: 0000000000000000 RSI: 000000000014927e RDI: 0000000020000180
    RBP: 00007f2d4f2c847a R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
    R13: 000000000000006e R14: 00007f2d4f39c120 R15: 00007ffcbb50d888
    </TASK>
    Modules linked in:
    ---[ end trace 0000000000000000 ]---
    RIP: 0010:__extent_writepage_io+0xcce/0xcf0 fs/btrfs/extent_io.c:1351
    Code: 18 83 70 07 0f 0b e8 a1 0c f2 fd 48 c7 c7 c0 b6 8b 8b 48 c7 c6 c0 c3 8b 8b 48 c7 c2 60 b6 8b 8b b9 47 05 00 00 e8 f2 82 70 07 <0f> 0b e8 7b 0c f2 fd 48 8b 3c 24 e8 82 2a 01 00 48 89 c7 48 c7 c6
    RSP: 0018:ffffc90003eef3a0 EFLAGS: 00010246
    RAX: 000000000000004e RBX: 0000000000000000 RCX: f5edcbbfef5d6800
    RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
    RBP: fffffffffffffffd R08: ffffffff81717a4c R09: 1ffff920007dde14
    R10: dffffc0000000000 R11: fffff520007dde15 R12: 0000000000002000
    R13: 0000000000002000 R14: ffffea0000db97e8 R15: ffff88801ce9b4e0
    FS: 00007f2d500396c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000001b30c22000 CR3: 0000000062c62000 CR4: 00000000003506f0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


    ---
    This report is generated by a bot. It may contain errors.
    See https://goo.gl/tpsmEJ for more information about syzbot.
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