hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5012 at fs/hfs/bnode.c:520 hfs_bnode_create+0x40c/0x4c8 fs/hfs/bnode.c:519
Modules linked in:
CPU: 1 PID: 5012 Comm: syz.0.108 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : hfs_bnode_create+0x40c/0x4c8 fs/hfs/bnode.c:519
lr : hfs_bnode_create+0x40c/0x4c8 fs/hfs/bnode.c:519
sp : ffff800021327580
x29: ffff8000213275a0 x28: dfff800000000000 x27: dfff800000000000
x26: 0000000000000080 x25: 0000000000000000 x24: ffff0000d40d8488
x23: 1ffff00004264ec4 x22: 0000000000000000 x21: ffff0000deaa6000
x20: 0000000000000000 x19: ffff0000d40d8400 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082d25ac x15: 0000000000000002
x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000080000
x11: 000000000000ebab x10: ffff800021bab000 x9 : 772bc13a1f297600
x8 : 772bc13a1f297600 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800021327058 x4 : ffff8000151a4920 x3 : ffff80000a8467ac
x2 : ffff00019f6ddd10 x1 : 0000000100000000 x0 : 000000000000001f
Call trace:
 hfs_bnode_create+0x40c/0x4c8 fs/hfs/bnode.c:519
 hfs_bmap_alloc+0x4f4/0x59c fs/hfs/btree.c:291
 hfs_bnode_split+0xc8/0xbb8 fs/hfsplus/brec.c:245
 hfs_brec_insert+0x2e8/0x96c fs/hfs/brec.c:102
 hfs_cat_create+0x2d8/0x758 fs/hfs/catalog.c:118
 hfs_mkdir+0x6c/0xe0 fs/hfs/dir.c:232
 vfs_mkdir+0x314/0x4d4 fs/namei.c:4114
 do_mkdirat+0x1b4/0x3e0 fs/namei.c:4139
 __do_sys_mkdirat fs/namei.c:4154 [inline]
 __se_sys_mkdirat fs/namei.c:4152 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4152
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 4098
hardirqs last  enabled at (4097): [<ffff8000083086f0>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:261
hardirqs last disabled at (4098): [<ffff80001195cc30>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (3996): [<ffff8000080309e0>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (3994): [<ffff8000080309ac>] 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] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 5012 Comm: syz.0.108 Tainted: G        W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
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 : ffff800021327800
x29: ffff800021327800 x28: dfff800000000000 x27: ffff0000d40d8400
x26: ffff0000d40d8400 x25: ffff800021327a48 x24: 1fffe0001a81b080
x23: ffff0000deaa6000 x22: dfff800000000000 x21: 0000000000000000
x20: ffff0000d40d8480 x19: ffff0000d40d8400 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082d10fc x15: 0000000000000002
x14: 00000000000000ff x13: 0000000000000000 x12: 0000000000080000
x11: 0000000000028b97 x10: ffff800021bab000 x9 : ffff800008f858a0
x8 : 0000000000028b98 x7 : 0000000000000000 x6 : 000010000000de25
x5 : ffff0000c32c8e4d x4 : ffff0000f91fa688 x3 : ffff800008f855a4
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 hfs_bnode_put+0x358/0x364 fs/hfs/bnode.c:565
 hfs_brec_insert+0x678/0x96c fs/hfs/brec.c:162
 hfs_cat_create+0x2d8/0x758 fs/hfs/catalog.c:118
 hfs_mkdir+0x6c/0xe0 fs/hfs/dir.c:232
 vfs_mkdir+0x314/0x4d4 fs/namei.c:4114
 do_mkdirat+0x1b4/0x3e0 fs/namei.c:4139
 __do_sys_mkdirat fs/namei.c:4154 [inline]
 __se_sys_mkdirat fs/namei.c:4152 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4152
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: aa1403e0 97e5473c 17ffffce 97d470f9 (d4210000) 
---[ end trace 0000000000000000 ]---