hfs: new node 0 already hashed?
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1
WARNING: fs/hfs/bnode.c:520 at hfs_bnode_create.cold+0x41/0x49 fs/hfs/bnode.c:520, CPU#1: kworker/u8:10/3299
Modules linked in:
CPU: 1 UID: 0 PID: 3299 Comm: kworker/u8:10 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: 25 b1 63 0a e9 77 09 d1 01 e8 8b fb e0 00 4c 89 f7 e8 13 b1 63 0a e8 7e fb e0 00 89 ee 48 c7 c7 40 e2 d1 8b e8 40 df fa ff 90 <0f> 0b 90 e9 79 0c d1 01 e8 62 fb e0 00 e8 bd 51 4d 00 e9 d5 0e d1
RSP: 0018:ffffc900096d7020 EFLAGS: 00010282
RAX: 000000000000001f RBX: ffff88807c49c500 RCX: 0000000000000000
RDX: 000000000000001f RSI: ffffffff81e711a9 RDI: fffff520012dadf5
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88803821a000 R14: ffff88803821a0d8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124479000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4f077ec4b8 CR3: 000000000e596000 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:3302
 process_scheduled_works kernel/workqueue.c:3385 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
 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>