hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4529 at fs/hfs/bnode.c:520 hfs_bnode_create+0x40c/0x4c4 fs/hfs/bnode.c:519
Modules linked in:
CPU: 0 PID: 4529 Comm: kworker/u4:8 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: writeback wb_workfn (flush-7:1)
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : hfs_bnode_create+0x40c/0x4c4 fs/hfs/bnode.c:519
lr : hfs_bnode_create+0x40c/0x4c4 fs/hfs/bnode.c:519
sp : ffff800020f06d40
x29: ffff800020f06d60 x28: ffff7000041e0dbc x27: dfff800000000000
x26: 0000000000000080 x25: 0000000000000000 x24: ffff0000d66ac288
x23: dfff800000000000 x22: 0000000000000000 x21: ffff0000e03fa000
x20: 0000000000000000 x19: ffff0000d66ac200 x18: ffff800011b9bf60
x17: 0000000000000000 x16: ffff8000082d93d8 x15: 0000000000000000
x14: 0000000000000001 x13: 1ffff000041e0d10 x12: 0000000000ff0100
x11: ff00800008311784 x10: 0000000000000000 x9 : 3b24c6d67207bc00
x8 : 3b24c6d67207bc00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800020f06818 x4 : ffff800015304cc0 x3 : ffff80000a891490
x2 : ffff00019f531d10 x1 : 0000000100000000 x0 : 000000000000001f
Call trace:
 hfs_bnode_create+0x40c/0x4c4 fs/hfs/bnode.c:519
 hfs_bmap_alloc+0x4fc/0x5ac fs/hfs/btree.c:291
 hfs_btree_inc_height+0x108/0x890 fs/hfs/brec.c:490
 hfs_brec_insert+0x5c4/0x97c fs/hfs/brec.c:148
 __hfs_ext_write_extent+0x22c/0x484 fs/hfs/extent.c:124
 hfs_ext_write_extent+0x154/0x1e0 fs/hfs/extent.c:144
 hfs_write_inode+0xf0/0x8dc fs/hfs/inode.c:434
 write_inode fs/fs-writeback.c:1470 [inline]
 __writeback_single_inode+0x5e0/0x1554 fs/fs-writeback.c:1687
 writeback_sb_inodes+0x858/0x143c fs/fs-writeback.c:1913
 wb_writeback+0x414/0xfcc fs/fs-writeback.c:2087
 wb_do_writeback fs/fs-writeback.c:2230 [inline]
 wb_workfn+0x360/0xe18 fs/fs-writeback.c:2270
 process_one_work+0x7f8/0x13a4 kernel/workqueue.c:2292
 worker_thread+0x8c4/0xfec kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
irq event stamp: 532928
hardirqs last  enabled at (532927): [<ffff80000830fbe0>] __up_console_sem+0xb4/0xfc kernel/printk/printk.c:261
hardirqs last disabled at (532928): [<ffff800011a39234>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (532756): [<ffff8000081ac410>] softirq_handle_end kernel/softirq.c:439 [inline]
softirqs last  enabled at (532756): [<ffff8000081ac410>] handle_softirqs+0xaec/0xc60 kernel/softirq.c:624
softirqs last disabled at (532749): [<ffff800008020164>] __do_softirq+0x14/0x20 kernel/softirq.c:630
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
kernel BUG at fs/hfs/bnode.c:565!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4529 Comm: kworker/u4:8 Tainted: G        W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: writeback wb_workfn (flush-7:1)
pstate: 82400005 (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 : ffff800020f06e40
x29: ffff800020f06e40 x28: 0000000000000302 x27: dfff800000000000
x26: ffff7000041e0ddc x25: ffff800020f06ee0 x24: 1fffe0001acd5840
x23: ffff0000e03fa000 x22: dfff800000000000 x21: 0000000000000000
x20: ffff0000d66ac280 x19: ffff0000d66ac200 x18: ffff800011b9bf60
x17: 0000000000000000 x16: ffff8000082ef09c x15: 0000000000000000
x14: 0000000000000001 x13: 1fffe0001acd5850 x12: 0000000000ff0100
x11: ff00800008fa1ed4 x10: 0000000000000000 x9 : ffff800008fa1ed4
x8 : ffff0000d6479bc0 x7 : ffff8000118d0f24 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008fa1bd8
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 hfs_bnode_put+0x358/0x364 fs/hfs/bnode.c:565
 hfs_btree_inc_height+0x458/0x890 fs/hfs/brec.c:544
 hfs_brec_insert+0x5c4/0x97c fs/hfs/brec.c:148
 __hfs_ext_write_extent+0x22c/0x484 fs/hfs/extent.c:124
 hfs_ext_write_extent+0x154/0x1e0 fs/hfs/extent.c:144
 hfs_write_inode+0xf0/0x8dc fs/hfs/inode.c:434
 write_inode fs/fs-writeback.c:1470 [inline]
 __writeback_single_inode+0x5e0/0x1554 fs/fs-writeback.c:1687
 writeback_sb_inodes+0x858/0x143c fs/fs-writeback.c:1913
 wb_writeback+0x414/0xfcc fs/fs-writeback.c:2087
 wb_do_writeback fs/fs-writeback.c:2230 [inline]
 wb_workfn+0x360/0xe18 fs/fs-writeback.c:2270
 process_one_work+0x7f8/0x13a4 kernel/workqueue.c:2292
 worker_thread+0x8c4/0xfec kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
Code: aa1403e0 97e51623 17ffffce 97d42619 (d4210000) 
---[ end trace 0000000000000000 ]---