------------[ cut here ]------------
WARNING: CPU: 1 PID: 6633 at fs/hfs/bnode.c:520 hfs_bnode_create+0x461/0x4f0
Modules linked in:
CPU: 1 UID: 0 PID: 6633 Comm: syz.5.120 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:hfs_bnode_create+0x461/0x4f0
Code: a1 8b 89 ee e8 60 d2 8d fe e9 cf fc ff ff e8 96 e1 25 ff 4c 89 ef e8 5e f0 e2 08 48 c7 c7 a0 ce a1 8b 89 ee e8 40 d2 8d 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:ffffc900024dedc0 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff88802fce0000 RCX: 93d83513c58e3300
RDX: ffffc900091aa000 RSI: 000000000001ece8 RDI: 000000000001ece9
RBP: 0000000000000000 R08: ffffc900024deae7 R09: 1ffff9200049bd5c
R10: dffffc0000000000 R11: fffff5200049bd5d R12: 0000000000000000
R13: ffff88802fce00e0 R14: ffff888107b28200 R15: dffffc0000000000
FS:  00007f62a4ef36c0(0000) GS:ffff8881a3c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9b17dd7dac CR3: 000000001fc7c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5bb/0x640
 hfs_btree_inc_height+0xf6/0xac0
 hfs_brec_insert+0x743/0xbd0
 __hfs_ext_write_extent+0x2a1/0x470
 __hfs_ext_cache_extent+0x6b/0x9b0
 hfs_extend_file+0x316/0x1230
 hfs_get_block+0x3d7/0xbd0
 __block_write_begin_int+0x6b5/0x1900
 cont_write_begin+0x789/0xb50
 hfs_write_begin+0x66/0xb0
 cont_write_begin+0x2fd/0xb50
 hfs_write_begin+0x66/0xb0
 hfs_file_truncate+0x190/0x9c0
 hfs_inode_setattr+0x4a9/0x670
 notify_change+0xb36/0xe40
 do_truncate+0x1a4/0x220
 do_ftruncate+0x489/0x540
 __x64_sys_ftruncate+0x92/0xf0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f62a3f8eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f62a4ef3038 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007f62a41d5fa0 RCX: 00007f62a3f8eba9
RDX: 0000000000000000 RSI: 000000000000c17a RDI: 0000000000000004
RBP: 00007f62a4011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f62a41d6038 R14: 00007f62a41d5fa0 R15: 00007ffc19690fc8
 </TASK>
