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    Subject[syzbot] [xfs?] BUG: corrupted list in xfs_trans_del_item
    From
    Hello,

    syzbot found the following issue on:

    HEAD commit: a5541c0811a0 Merge branch 'for-next/core' into for-kernelci
    git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
    console output: https://syzkaller.appspot.com/x/log.txt?x=10dd01ac480000
    kernel config: https://syzkaller.appspot.com/x/.config?x=cbd4e584773e9397
    dashboard link: https://syzkaller.appspot.com/bug?extid=5d3521f1abbb5c599e55
    compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
    userspace arch: arm64
    syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13bf9550480000
    C reproducer: https://syzkaller.appspot.com/x/repro.c?x=146deeb0480000

    Downloadable assets:
    disk image: https://storage.googleapis.com/syzbot-assets/4b7702208fb9/disk-a5541c08.raw.xz
    vmlinux: https://storage.googleapis.com/syzbot-assets/9ec0153ec051/vmlinux-a5541c08.xz
    kernel image: https://storage.googleapis.com/syzbot-assets/6f8725ad290a/Image-a5541c08.gz.xz
    mounted in repro: https://storage.googleapis.com/syzbot-assets/0b962d567fb3/mount_0.gz

    IMPORTANT: if you fix the issue, please add the following tag to the commit:
    Reported-by: syzbot+5d3521f1abbb5c599e55@syzkaller.appspotmail.com

    XFS (loop0): Metadata corruption detected at xfs_btree_lookup_get_block+0x220/0x2b0 fs/xfs/libxfs/xfs_btree.c:1846, xfs_refcountbt block 0x18
    XFS (loop0): Unmount and run xfs_repair
    list_del corruption, ffff0000c66a53f8->next is NULL
    ------------[ cut here ]------------
    kernel BUG at lib/list_debug.c:50!
    Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
    Modules linked in:
    CPU: 0 PID: 3071 Comm: syz-executor314 Not tainted 6.1.0-rc8-syzkaller-33330-ga5541c0811a0 #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
    pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
    pc : __list_del_entry_valid+0x70/0xd0 lib/list_debug.c:49
    lr : __list_del_entry_valid+0x70/0xd0 lib/list_debug.c:49
    sp : ffff80000fedb8e0
    x29: ffff80000fedb8e0 x28: ffff0000c71ab480 x27: 0000000000000000
    x26: ffff0000c970b400 x25: 0000000000000000 x24: 000000000000000d
    x23: ffff0000c66a5128 x22: ffff0000c66a5190 x21: 0000000000000000
    x20: ffff0000c66a53f8 x19: ffff0000c66a53e8 x18: 00000000000000c0
    x17: ffff80000dda8198 x16: ffff80000dbe6158 x15: ffff0000c71ab480
    x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c71ab480
    x11: ff808000081c4d64 x10: 0000000000000000 x9 : 0c68720d3549f800
    x8 : 0c68720d3549f800 x7 : ffff80000c091ebc x6 : 0000000000000000
    x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
    x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000033
    Call trace:
    __list_del_entry_valid+0x70/0xd0 lib/list_debug.c:49
    __list_del_entry include/linux/list.h:134 [inline]
    list_del_init include/linux/list.h:206 [inline]
    xfs_trans_del_item+0x38/0x94 fs/xfs/xfs_trans.c:696
    xfs_trans_brelse+0xa0/0xdc fs/xfs/xfs_trans_buf.c:385
    xfs_btree_del_cursor+0x64/0x134 fs/xfs/libxfs/xfs_btree.c:440
    xfs_refcount_recover_cow_leftovers+0x150/0x344 fs/xfs/libxfs/xfs_refcount.c:1834
    xfs_reflink_recover_cow+0x5c/0x100 fs/xfs/xfs_reflink.c:930
    xlog_recover_finish+0x310/0x3bc fs/xfs/xfs_log_recover.c:3493
    xfs_log_mount_finish+0xd4/0x250 fs/xfs/xfs_log.c:827
    xfs_mountfs+0x7e4/0xb38 fs/xfs/xfs_mount.c:919
    xfs_fs_fill_super+0x804/0x880 fs/xfs/xfs_super.c:1666
    get_tree_bdev+0x1e8/0x2a0 fs/super.c:1324
    xfs_fs_get_tree+0x28/0x38 fs/xfs/xfs_super.c:1713
    vfs_get_tree+0x40/0x140 fs/super.c:1531
    do_new_mount+0x1dc/0x4e4 fs/namespace.c:3040
    path_mount+0x358/0x890 fs/namespace.c:3370
    do_mount fs/namespace.c:3383 [inline]
    __do_sys_mount fs/namespace.c:3591 [inline]
    __se_sys_mount fs/namespace.c:3568 [inline]
    __arm64_sys_mount+0x2c4/0x3c4 fs/namespace.c:3568
    __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
    invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
    el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
    do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197
    el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
    el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
    el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584
    Code: d65f03c0 b001b740 91013000 94aa89fa (d4210000)
    ---[ end trace 0000000000000000 ]---


    ---
    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.

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    syzbot can test patches for this issue, for details see:
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