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/u8:7/1039
Modules linked in:
CPU: 1 UID: 0 PID: 1039 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: writeback wb_workfn (flush-7:3)
RIP: 0010:hfs_bnode_create.cold+0x41/0x49 fs/hfs/bnode.c:520
Code: 75 a4 63 0a e9 47 56 d1 01 e8 bb 21 e1 00 4c 89 f7 e8 63 a4 63 0a e8 ae 21 e1 00 89 ee 48 c7 c7 40 e9 d1 8b e8 20 e1 fa ff 90 <0f> 0b 90 e9 49 59 d1 01 e8 92 21 e1 00 e8 bd 4c 4d 00 e9 a5 5b d1
RSP: 0018:ffffc900053cf020 EFLAGS: 00010282
RAX: 000000000000001f RBX: ffff888029a7f400 RCX: 0000000000000000
RDX: 000000000000001f RSI: ffffffff81e72a69 RDI: fffff52000a79df5
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888050de0000 R14: ffff888050de00d8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124484000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6e6b5b1d58 CR3: 000000005b698000 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:1584 [inline]
 __writeback_single_inode+0xcd4/0x1350 fs/fs-writeback.c:1827
 writeback_sb_inodes+0x766/0x1c60 fs/fs-writeback.c:2056
 wb_writeback+0x1bf/0xb90 fs/fs-writeback.c:2241
 wb_do_writeback fs/fs-writeback.c:2388 [inline]
 wb_workfn+0x14f/0xc00 fs/fs-writeback.c:2428
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314
 process_scheduled_works kernel/workqueue.c:3397 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
 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>