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/u8:1/13
Modules linked in:
CPU: 1 UID: 0 PID: 13 Comm: kworker/u8:1 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-7:2)
RIP: 0010:hfs_bnode_create.cold+0x41/0x49 fs/hfs/bnode.c:520
Code: 85 51 65 0a e9 d7 43 d1 01 e8 2b 21 e1 00 4c 89 f7 e8 73 51 65 0a e8 1e 21 e1 00 89 ee 48 c7 c7 40 e9 d1 8b e8 b0 df fa ff 90 <0f> 0b 90 e9 d9 46 d1 01 e8 02 21 e1 00 e8 7d 5b 4d 00 e9 35 49 d1
RSP: 0018:ffffc90000127020 EFLAGS: 00010282
RAX: 000000000000001f RBX: ffff888036fe7900 RCX: 0000000000000000
RDX: 000000000000001f RSI: ffffffff81e72d69 RDI: fffff52000024df5
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888076d2a000 R14: ffff888076d2a0d8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88812446b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd960945690 CR3: 000000005caf3000 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>