hfs: new node 0 already hashed?
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1
WARNING: fs/hfs/bnode.c:478 at hfs_bnode_create+0x45a/0x4e0 fs/hfs/bnode.c:478, CPU#1: syz.4.157/7044
Modules linked in:
CPU: 1 UID: 0 PID: 7044 Comm: syz.4.157 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:hfs_bnode_create+0x45a/0x4e0 fs/hfs/bnode.c:478
Code: 89 8b 89 ee e8 57 92 77 fe e9 d6 fc ff ff e8 0d c8 16 ff 4c 89 ef e8 75 18 aa 08 48 c7 c7 00 4f 89 8b 89 ee e8 37 92 77 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: 0000:ffffc90004b47108 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff88803a706000 RCX: e7d147dea831b700
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000968dd1 R12: 0000000000000000
R13: ffff88803a7060d0 R14: ffff88803c6f2600 R15: dffffc0000000000
FS:  00007f4d7a5e46c0(0000) GS:ffff888125cc8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4d72099000 CR3: 000000003d0ec000 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
 generic_perform_write+0x2ad/0x8b0 mm/filemap.c:4374
 generic_file_write_iter+0xaf/0x330 mm/filemap.c:4517
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61e/0xbb0 fs/read_write.c:687
 ksys_write+0x156/0x270 fs/read_write.c:739
 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: 0033:0x7f4d7c3ce159
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:00007f4d7a5e4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f4d7c656180 RCX: 00007f4d7c3ce159
RDX: 0000000000010028 RSI: 0000200000000140 RDI: 0000000000000004
RBP: 00007f4d7c46506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4d7c656218 R14: 00007f4d7c656180 R15: 00007fffcfeaa0e8
 </TASK>