syzbot

hfs: new node 0 already hashed?
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WARNING: fs/hfs/bnode.c:520 at hfs_bnode_create+0x461/0x4f0 fs/hfs/bnode.c:520, CPU#0: kworker/u8:6/150
Modules linked in:
CPU: 0 UID: 0 PID: 150 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:hfs_bnode_create+0x461/0x4f0 fs/hfs/bnode.c:520
Code: 67 8b 89 ee e8 80 a2 81 fe e9 cf fc ff ff e8 36 b9 1e ff 4c 89 ef e8 8e 31 7a 08 48 c7 c7 a0 93 67 8b 89 ee e8 60 a2 81 fe 90 <0f> 0b 90 eb b0 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c d6 fb ff ff
RSP: 0018:ffffc900039cec60 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff8880338ec000 RCX: 297c0ad4175cce00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000739d3d R12: 0000000000000000
R13: ffff8880338ec0d0 R14: ffff8880408b8600 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888126170000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff9282cdd30 CR3: 0000000045776000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5c1/0x650 fs/hfs/btree.c:326
 hfs_btree_inc_height+0x100/0xad0 fs/hfs/brec.c:490
 hfs_brec_insert+0x7ef/0xc90 fs/hfs/brec.c:148
 __hfs_ext_write_extent+0x2a1/0x470 fs/hfs/extent.c:124
 hfs_ext_write_extent+0x17e/0x210 fs/hfs/extent.c:144
 hfs_write_inode+0x117/0x960 fs/hfs/inode.c:459
 write_inode fs/fs-writeback.c:1584 [inline]
 __writeback_single_inode+0x75d/0x10e0 fs/fs-writeback.c:1827
 writeback_sb_inodes+0x97f/0x1980 fs/fs-writeback.c:2056
 wb_writeback+0x445/0xb00 fs/fs-writeback.c:2241
 wb_do_writeback fs/fs-writeback.c:2388 [inline]
 wb_workfn+0x3fd/0xf20 fs/fs-writeback.c:2428
 process_one_work kernel/workqueue.c:3314 [inline]
 process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>