hfs: new node 0 already hashed?
------------[ cut here ]------------
1
WARNING: fs/hfs/bnode.c:520 at hfs_bnode_create.cold+0x41/0x49 fs/hfs/bnode.c:520, CPU#1: kworker/u8:6/142
Modules linked in:
CPU: 1 UID: 0 PID: 142 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: writeback wb_workfn (flush-7:1)
RIP: 0010:hfs_bnode_create.cold+0x41/0x49 fs/hfs/bnode.c:520
Code: bd 07 6b 0a e9 af a2 d0 01 e8 23 73 e1 00 4c 89 f7 e8 ab 07 6b 0a e8 16 73 e1 00 89 ee 48 c7 c7 c0 7d d1 8b e8 f8 e2 fa ff 90 <0f> 0b 90 e9 b1 a5 d0 01 e8 fa 72 e1 00 e8 c5 fc 4d 00 e9 0d a8 d0
RSP: 0018:ffffc90002ed7030 EFLAGS: 00010282
RAX: 000000000000001f RBX: ffff888037ee6200 RCX: 0000000000000000
RDX: 000000000000001f RSI: ffffffff81e7abe9 RDI: fffff520005dadf7
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888077bca000 R14: ffff888077bca0e0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88812443c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffbeb9e9f00 CR3: 0000000025779000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5a7/0x6b0 fs/hfs/btree.c:326
 hfs_btree_inc_height.isra.0+0xff/0x820 fs/hfs/brec.c:490
 hfs_brec_insert+0x8ba/0xc20 fs/hfs/brec.c:148
 __hfs_ext_write_extent+0x3ef/0x510 fs/hfs/extent.c:124
 hfs_ext_write_extent+0x1b7/0x200 fs/hfs/extent.c:144
 hfs_write_inode+0xce/0xab0 fs/hfs/inode.c:459
 write_inode fs/fs-writeback.c:1582 [inline]
 __writeback_single_inode+0xd00/0x13c0 fs/fs-writeback.c:1825
 writeback_sb_inodes+0x766/0x1c70 fs/fs-writeback.c:2054
 wb_writeback+0x1c0/0xbe0 fs/fs-writeback.c:2239
 wb_do_writeback fs/fs-writeback.c:2386 [inline]
 wb_workfn+0x142/0xc00 fs/fs-writeback.c:2426
 process_one_work+0xa23/0x19a0 kernel/workqueue.c:3276
 process_scheduled_works kernel/workqueue.c:3359 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3440
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>