hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 42 at fs/hfs/bnode.c:520 hfs_bnode_create+0x384/0x430 fs/hfs/bnode.c:519
Modules linked in:
CPU: 1 UID: 0 PID: 42 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Workqueue: writeback wb_workfn (flush-7:0)
pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : hfs_bnode_create+0x384/0x430 fs/hfs/bnode.c:519
lr : hfs_bnode_create+0x384/0x430 fs/hfs/bnode.c:519
sp : ffff8000992a6c30
x29: ffff8000992a6c40 x28: 0000000000000000 x27: dfff800000000000
x26: 0000000000000080 x25: dfff800000000000 x24: 0000000000000000
x23: ffff000102fb308c x22: 0000000000000000 x21: 0000000000000000
x20: ffff000100e1e000 x19: ffff0000c4985600 x18: 0000000000000000
x17: ffff800093524000 x16: ffff80008b0155d8 x15: 0000000000000001
x14: 1ffff00013254cfc x13: 0000000000000000 x12: 0000000000000000
x11: ffff700013254cfd x10: 0000000000ff0100 x9 : 512a2080678e9800
x8 : 512a2080678e9800 x7 : ffff800080563530 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000807de538
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000001f
Call trace:
 hfs_bnode_create+0x384/0x430 fs/hfs/bnode.c:519 (P)
 hfs_bmap_alloc+0x5b0/0x688 fs/hfs/btree.c:326
 hfs_btree_inc_height+0xf8/0x870 fs/hfs/brec.c:471
 hfs_brec_insert+0x5bc/0x96c fs/hfs/brec.c:148
 __hfs_ext_write_extent+0x230/0x488 fs/hfs/extent.c:124
 hfs_ext_write_extent+0x144/0x1bc fs/hfs/extent.c:144
 hfs_write_inode+0xbc/0x704 fs/hfs/inode.c:429
 write_inode fs/fs-writeback.c:1525 [inline]
 __writeback_single_inode+0x5ac/0x13e8 fs/fs-writeback.c:1745
 writeback_sb_inodes+0x55c/0xe40 fs/fs-writeback.c:1976
 wb_writeback+0x3cc/0xd70 fs/fs-writeback.c:2156
 wb_do_writeback fs/fs-writeback.c:2303 [inline]
 wb_workfn+0x338/0xdc0 fs/fs-writeback.c:2343
 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x958/0xed8 kernel/workqueue.c:3400
 kthread+0x5fc/0x75c kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
irq event stamp: 3047960
hardirqs last  enabled at (3047959): [<ffff80008b01441c>] irqentry_exit+0xd8/0x108 kernel/entry/common.c:214
hardirqs last disabled at (3047960): [<ffff80008b00e86c>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:434
softirqs last  enabled at (3047894): [<ffff80008ad75a30>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (3047894): [<ffff80008ad75a30>] batadv_nc_purge_paths+0x2f4/0x37c net/batman-adv/network-coding.c:471
softirqs last disabled at (3047892): [<ffff80008ad7580c>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (3047892): [<ffff80008ad7580c>] batadv_nc_purge_paths+0xd0/0x37c net/batman-adv/network-coding.c:442
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
kernel BUG at fs/hfs/bnode.c:565!
Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 42 Comm: kworker/u8:3 Tainted: G        W           syzkaller #0 PREEMPT 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Workqueue: writeback wb_workfn (flush-7:0)
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : hfs_bnode_put+0x358/0x364 fs/hfs/bnode.c:565
lr : hfs_bnode_put+0x358/0x364 fs/hfs/bnode.c:565
sp : ffff8000992a6d20
x29: ffff8000992a6d20 x28: 0000000000000302 x27: dfff800000000000
x26: ffff700013254db8 x25: ffff8000992a6dc0 x24: 1fffe00018930ac0
x23: ffff000100e1e000 x22: dfff800000000000 x21: 0000000000000000
x20: ffff0000c4985680 x19: ffff0000c4985600 x18: 0000000000000000
x17: ffff800093524000 x16: ffff8000805353bc x15: 0000000000000001
x14: 1fffe00018930ad0 x13: 0000000000000000 x12: 0000000000000000
x11: ffff600018930ad1 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000c1c5db80 x7 : ffff80008af7fbc0 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008130621c
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 hfs_bnode_put+0x358/0x364 fs/hfs/bnode.c:565 (P)
 hfs_btree_inc_height+0x448/0x870 fs/hfs/brec.c:525
 hfs_brec_insert+0x5bc/0x96c fs/hfs/brec.c:148
 __hfs_ext_write_extent+0x230/0x488 fs/hfs/extent.c:124
 hfs_ext_write_extent+0x144/0x1bc fs/hfs/extent.c:144
 hfs_write_inode+0xbc/0x704 fs/hfs/inode.c:429
 write_inode fs/fs-writeback.c:1525 [inline]
 __writeback_single_inode+0x5ac/0x13e8 fs/fs-writeback.c:1745
 writeback_sb_inodes+0x55c/0xe40 fs/fs-writeback.c:1976
 wb_writeback+0x3cc/0xd70 fs/fs-writeback.c:2156
 wb_do_writeback fs/fs-writeback.c:2303 [inline]
 wb_workfn+0x338/0xdc0 fs/fs-writeback.c:2343
 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x958/0xed8 kernel/workqueue.c:3400
 kthread+0x5fc/0x75c kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
Code: aa1403e0 97e59f70 17ffffce 97d0a3ea (d4210000) 
---[ end trace 0000000000000000 ]---