hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6230 at fs/hfs/bnode.c:522 hfs_bnode_create+0x418/0x4c8 fs/hfs/bnode.c:521
Modules linked in:
CPU: 0 PID: 6230 Comm: syz.5.313 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : hfs_bnode_create+0x418/0x4c8 fs/hfs/bnode.c:521
lr : hfs_bnode_create+0x418/0x4c8 fs/hfs/bnode.c:521
sp : ffff800022227600
x29: ffff800022227620 x28: ffff700004444ed4 x27: 0000000000000000
x26: 0000000000000080 x25: 0000000000000000 x24: dfff800000000000
x23: dfff800000000000 x22: 0000000000000000 x21: 0000000000000000
x20: ffff0000c34c8000 x19: ffff0000dbef8c00 x18: 1fffe00033e7277e
x17: ffff80001537d000 x16: ffff800011b90080 x15: 0000000040000000
x14: 0000000000000001 x13: 1ffff00004444e28 x12: 0000000000080000
x11: 0000000000041d20 x10: ffff800022399000 x9 : 263376bc3f3ca400
x8 : 263376bc3f3ca400 x7 : ffff80000825ab50 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : ffff80000a927f5c
x2 : ffff00019f393d10 x1 : 0000000100000000 x0 : 000000000000001f
Call trace:
 hfs_bnode_create+0x418/0x4c8 fs/hfs/bnode.c:521
 hfs_bmap_alloc+0x500/0x5b4 fs/hfs/btree.c:291
 hfs_bnode_split+0xd4/0xb50 fs/hfsplus/brec.c:245
 hfs_brec_insert+0x308/0x998 fs/hfs/brec.c:102
 hfs_cat_create+0x2fc/0x7dc fs/hfs/catalog.c:118
 hfs_mkdir+0x70/0xe4 fs/hfs/dir.c:232
 vfs_mkdir+0x314/0x4d8 fs/namei.c:4114
 do_mkdirat+0x1b8/0x3ec 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+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 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: 1968
hardirqs last  enabled at (1967): [<ffff80000825abe4>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline]
hardirqs last  enabled at (1967): [<ffff80000825abe4>] finish_lock_switch+0xb0/0x1c8 kernel/sched/core.c:5005
hardirqs last disabled at (1968): [<ffff800011b8c2bc>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (1896): [<ffff800008031254>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (1894): [<ffff800008031220>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
kernel BUG at fs/hfs/bnode.c:567!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 6230 Comm: syz.5.313 Tainted: G        W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : hfs_bnode_put+0x358/0x364 fs/hfs/bnode.c:567
lr : hfs_bnode_put+0x358/0x364 fs/hfs/bnode.c:567
sp : ffff800022227840
x29: ffff800022227840 x28: dfff800000000000 x27: ffff800022227a60
x26: 00000000ffffffff x25: ffff0000dbef8c00 x24: 1fffe0001b7df180
x23: ffff0000c34c8000 x22: dfff800000000000 x21: 0000000000000000
x20: ffff0000dbef8c80 x19: ffff0000dbef8c00 x18: 1fffe00033e7277e
x17: ffff80001537d000 x16: ffff8000082dbd3c x15: 0000000000000002
x14: 0000000000000001 x13: 1fffe0001b7df190 x12: 0000000000080000
x11: 0000000000067567 x10: ffff800022399000 x9 : ffff800008fb8fac
x8 : 0000000000067568 x7 : 0000000000000000 x6 : 000010000000de25
x5 : ffff0000d899bc4d x4 : ffff0000fced2688 x3 : ffff800008fb8cb0
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 hfs_bnode_put+0x358/0x364 fs/hfs/bnode.c:567
 hfs_brec_insert+0x68c/0x998 fs/hfs/brec.c:162
 hfs_cat_create+0x2fc/0x7dc fs/hfs/catalog.c:118
 hfs_mkdir+0x70/0xe4 fs/hfs/dir.c:232
 vfs_mkdir+0x314/0x4d8 fs/namei.c:4114
 do_mkdirat+0x1b8/0x3ec 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+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 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 97e4ee56 17ffffce 97d3e707 (d4210000) 
---[ end trace 0000000000000000 ]---