hfs: new node 0 already hashed?
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1
WARNING: fs/hfs/bnode.c:520 at hfs_bnode_create+0x461/0x4f0 fs/hfs/bnode.c:520, CPU#1: syz.0.348/7475
Modules linked in:
CPU: 1 UID: 0 PID: 7475 Comm: syz.0.348 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
RIP: 0010:hfs_bnode_create+0x461/0x4f0 fs/hfs/bnode.c:520
Code: c7 8b 89 ee e8 e0 c7 80 fe e9 cf fc ff ff e8 c6 e9 1b ff 4c 89 ef e8 5e bf d9 08 48 c7 c7 a0 c7 c7 8b 89 ee e8 c0 c7 80 fe 90 <0f> 0b 90 eb b0 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c d6 fb ff ff
RSP: 0018:ffffc90002e36da0 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff888052ce0000 RCX: 676509dc4d3dac00
RDX: ffffc9000c401000 RSI: 00000000000190d5 RDI: 00000000000190d6
RBP: 0000000000000000 R08: ffffc90002e36b27 R09: 1ffff920005c6d64
R10: dffffc0000000000 R11: fffff520005c6d65 R12: 0000000000000000
R13: ffff888052ce00e0 R14: ffff888076ea5e00 R15: dffffc0000000000
FS:  00007fd5de6ce6c0(0000) GS:ffff8881257f5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2cadd6 CR3: 0000000076398000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5c1/0x650 fs/hfs/btree.c:326
 hfs_btree_inc_height+0x100/0xad0 fs/hfs/brec.c:490
 hfs_brec_insert+0x7ef/0xc90 fs/hfs/brec.c:148
 __hfs_ext_write_extent+0x2a1/0x470 fs/hfs/extent.c:124
 __hfs_ext_cache_extent+0x6b/0x9b0 fs/hfs/extent.c:174
 hfs_ext_read_extent fs/hfs/extent.c:202 [inline]
 hfs_extend_file+0x39b/0x15e0 fs/hfs/extent.c:401
 hfs_get_block+0x412/0xc50 fs/hfs/extent.c:353
 __block_write_begin_int+0x6c6/0x1910 fs/buffer.c:2146
 block_write_begin fs/buffer.c:2257 [inline]
 cont_write_begin+0x737/0xae0 fs/buffer.c:2595
 hfs_write_begin+0x66/0xb0 fs/hfs/inode.c:53
 cont_expand_zero fs/buffer.c:2523 [inline]
 cont_write_begin+0x2e7/0xae0 fs/buffer.c:2585
 hfs_write_begin+0x66/0xb0 fs/hfs/inode.c:53
 hfs_file_truncate+0x1cf/0xb70 fs/hfs/extent.c:495
 hfs_inode_setattr+0x4a9/0x670 fs/hfs/inode.c:666
 notify_change+0xc1a/0xf40 fs/attr.c:546
 do_truncate+0x1c2/0x250 fs/open.c:68
 do_ftruncate+0x4db/0x5c0 fs/open.c:196
 do_sys_ftruncate fs/open.c:208 [inline]
 __do_sys_ftruncate fs/open.c:213 [inline]
 __se_sys_ftruncate fs/open.c:211 [inline]
 __x64_sys_ftruncate+0x92/0xf0 fs/open.c:211
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd5dd79acb9
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:00007fd5de6ce028 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007fd5dda15fa0 RCX: 00007fd5dd79acb9
RDX: 0000000000000000 RSI: 000000000000c17a RDI: 0000000000000004
RBP: 00007fd5dd808bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd5dda16038 R14: 00007fd5dda15fa0 R15: 00007ffc7807b7b8
 </TASK>