hfs: new node 0 already hashed?
------------[ cut here ]------------
1
WARNING: fs/hfs/bnode.c:478 at hfs_bnode_create+0x45a/0x4e0 fs/hfs/bnode.c:478, CPU#1: syz.3.404/10697
Modules linked in:
CPU: 1 UID: 0 PID: 10697 Comm: syz.3.404 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:hfs_bnode_create+0x45a/0x4e0 fs/hfs/bnode.c:478
Code: 89 8b 89 ee e8 17 39 76 fe e9 d6 fc ff ff e8 0d ab 15 ff 4c 89 ef e8 b5 be ab 08 48 c7 c7 80 79 89 8b 89 ee e8 f7 38 76 fe 90 <0f> 0b 90 eb b0 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c dd fb ff ff
RSP: 0018:ffffc9000572eda8 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff8880273a4000 RCX: fc7007b6ded60000
RDX: ffffc9000f993000 RSI: 000000000000f1c2 RDI: 000000000000f1c3
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000ae5d65 R12: 0000000000000000
R13: ffff8880273a40d0 R14: ffff88803b70ae00 R15: dffffc0000000000
FS:  00007ff5472c56c0(0000) GS:ffff888124abb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c362f02 CR3: 000000005c3ec000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 hfs_btree_inc_height+0xf9/0xac0 fs/hfs/brec.c:490
 hfs_brec_insert+0x7eb/0xc80 fs/hfs/brec.c:148
 __hfs_ext_write_extent+0x2a3/0x470 fs/hfs/extent.c:124
 __hfs_ext_cache_extent+0x6e/0x9b0 fs/hfs/extent.c:174
 hfs_ext_read_extent fs/hfs/extent.c:202 [inline]
 hfs_extend_file+0x3ad/0x1680 fs/hfs/extent.c:401
 hfs_get_block+0x401/0xbf0 fs/hfs/extent.c:353
 __block_write_begin_int+0x6c2/0x1900 fs/buffer.c:2030
 block_write_begin fs/buffer.c:2144 [inline]
 cont_write_begin+0x71b/0xac0 fs/buffer.c:2506
 hfs_write_begin+0x123/0x1c0 fs/hfs/inode.c:62
 cont_expand_zero fs/buffer.c:2434 [inline]
 cont_write_begin+0x2d6/0xac0 fs/buffer.c:2496
 hfs_write_begin+0x123/0x1c0 fs/hfs/inode.c:62
 hfs_file_truncate+0x1d2/0xb70 fs/hfs/extent.c:495
 hfs_inode_setattr+0x4a3/0x6d0 fs/hfs/inode.c:688
 notify_change+0xbb8/0xec0 fs/attr.c:556
 do_truncate+0x1c2/0x250 fs/open.c:68
 vfs_truncate+0x4b7/0x540 fs/open.c:118
 ksys_truncate+0xf3/0x1c0 fs/open.c:142
 __do_sys_truncate fs/open.c:154 [inline]
 __se_sys_truncate fs/open.c:152 [inline]
 __x64_sys_truncate+0x5b/0x70 fs/open.c:152
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff54908e559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff5472c5028 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007ff549316090 RCX: 00007ff54908e559
RDX: 0000000000000000 RSI: 0000000000084007 RDI: 0000200000000d40
RBP: 00007ff5491258b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff549316128 R14: 00007ff549316090 R15: 00007ffc73999f88
 </TASK>