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/u8:2/36
Modules linked in:
CPU: 1 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:hfs_bnode_create.cold+0x41/0x49 fs/hfs/bnode.c:520
Code: 1e ad 70 0a e9 b0 f0 d5 01 e8 d4 d4 e1 00 4c 89 f7 e8 0c ad 70 0a e8 c7 d4 e1 00 89 ee 48 c7 c7 c0 70 d2 8b e8 d9 e2 fa ff 90 <0f> 0b 90 e9 b2 f3 d5 01 e8 ab d4 e1 00 e8 86 ff 4c 00 e9 0e f6 d5
RSP: 0018:ffffc90000ac7030 EFLAGS: 00010282
RAX: 000000000000001f RBX: ffff888073955800 RCX: 0000000000000000
RDX: 000000000000001f RSI: ffffffff81e78ad9 RDI: fffff52000158df7
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 77656e203a736668 R12: dffffc0000000000
R13: ffff8880331da000 R14: ffff8880331da0d8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88812441b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555dadea38 CR3: 0000000077f45000 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:461
 write_inode fs/fs-writeback.c:1607 [inline]
 __writeback_single_inode+0xcaa/0x1300 fs/fs-writeback.c:1850
 writeback_sb_inodes+0x766/0x1c50 fs/fs-writeback.c:2079
 wb_writeback+0x1c0/0xb50 fs/fs-writeback.c:2264
 wb_do_writeback fs/fs-writeback.c:2432 [inline]
 wb_workfn+0x143/0xc80 fs/fs-writeback.c:2477
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>