hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 6744 at fs/hfs/bnode.c:520 hfs_bnode_create+0x384/0x430 fs/hfs/bnode.c:519
Modules linked in:
CPU: 1 UID: 0 PID: 6744 Comm: syz.0.25 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
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 : ffff8000a2a57190
x29: ffff8000a2a571a0 x28: 0000000000000000 x27: dfff800000000000
x26: 0000000000000080 x25: dfff800000000000 x24: 0000000000000000
x23: ffff0000fd2230f8 x22: 0000000000000000 x21: 0000000000000000
x20: ffff0000f54a8000 x19: ffff0000cb3e7300 x18: 00000000ffffffff
x17: ffff800093524000 x16: ffff80008b0155d8 x15: 0000000000000001
x14: 1ffff0001454ada8 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000080000 x10: 000000000000314f x9 : 74abefc3b9f5f300
x8 : 74abefc3b9f5f300 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_bnode_split+0xc8/0xbb8 fs/hfsplus/brec.c:245
 hfs_brec_insert+0x2e8/0x96c fs/hfs/brec.c:102
 hfs_cat_create+0x2d0/0x590 fs/hfs/catalog.c:118
 hfs_create+0x6c/0xe0 fs/hfs/dir.c:202
 lookup_open fs/namei.c:3708 [inline]
 open_last_lookups fs/namei.c:3807 [inline]
 path_openat+0x12d8/0x2c40 fs/namei.c:4043
 do_filp_open+0x18c/0x36c fs/namei.c:4073
 do_sys_openat2+0x11c/0x1b4 fs/open.c:1435
 do_sys_open fs/open.c:1450 [inline]
 __do_sys_openat fs/open.c:1466 [inline]
 __se_sys_openat fs/open.c:1461 [inline]
 __arm64_sys_openat+0x120/0x158 fs/open.c:1461
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
irq event stamp: 400
hardirqs last  enabled at (399): [<ffff80008b01441c>] irqentry_exit+0xd8/0x108 kernel/entry/common.c:214
hardirqs last disabled at (400): [<ffff80008b00e86c>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:434
softirqs last  enabled at (344): [<ffff800080201608>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (342): [<ffff8000802015d4>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
kernel BUG at fs/hfs/bnode.c:565!
Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 6744 Comm: syz.0.25 Tainted: G        W           syzkaller #0 PREEMPT 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
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 : ffff8000a2a57400
x29: ffff8000a2a57400 x28: dfff800000000000 x27: ffff0000cb3e7300
x26: ffff0000cb3e7300 x25: ffff8000a2a57648 x24: 1fffe0001967ce60
x23: ffff0000f54a8000 x22: dfff800000000000 x21: 0000000000000000
x20: ffff0000cb3e7380 x19: ffff0000cb3e7300 x18: 00000000ffffffff
x17: ffff800093524000 x16: ffff80008b0156e8 x15: 0000000000000001
x14: 1fffe0001967ce70 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000080000 x10: 000000000001c9c9 x9 : ffff8000a4c0a000
x8 : 000000000001c9ca x7 : 0000000000000008 x6 : 0000100000000025
x5 : ffff0000f56412cd x4 : ffff0000fd223688 x3 : ffff80008130621c
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 hfs_bnode_put+0x358/0x364 fs/hfs/bnode.c:565 (P)
 hfs_brec_insert+0x678/0x96c fs/hfs/brec.c:162
 hfs_cat_create+0x2d0/0x590 fs/hfs/catalog.c:118
 hfs_create+0x6c/0xe0 fs/hfs/dir.c:202
 lookup_open fs/namei.c:3708 [inline]
 open_last_lookups fs/namei.c:3807 [inline]
 path_openat+0x12d8/0x2c40 fs/namei.c:4043
 do_filp_open+0x18c/0x36c fs/namei.c:4073
 do_sys_openat2+0x11c/0x1b4 fs/open.c:1435
 do_sys_open fs/open.c:1450 [inline]
 __do_sys_openat fs/open.c:1466 [inline]
 __se_sys_openat fs/open.c:1461 [inline]
 __arm64_sys_openat+0x120/0x158 fs/open.c:1461
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
Code: aa1403e0 97e59f70 17ffffce 97d0a3ea (d4210000) 
---[ end trace 0000000000000000 ]---