hfs: new node 0 already hashed?
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1
WARNING: fs/hfs/bnode.c:520 at hfs_bnode_create+0x461/0x4f0, CPU#0: syz.7.912/13943
Modules linked in:
CPU: 0 UID: 0 PID: 13943 Comm: syz.7.912 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: e8 8b 89 ee e8 00 b9 77 fe e9 cf fc ff ff e8 86 cd 15 ff 4c 89 ef e8 1e 7b fb 08 48 c7 c7 a0 2e e8 8b 89 ee e8 e0 b8 77 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:ffffc900039aeb00 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff8881738f4000 RCX: 9b58280f57715d00
RDX: ffffc90024405000 RSI: 0000000000000b15 RDI: 0000000000000b16
RBP: 0000000000000000 R08: ffffc900039ae887 R09: 1ffff92000735d10
R10: dffffc0000000000 R11: fffff52000735d11 R12: 0000000000000000
R13: ffff8881738f40d8 R14: ffff8881037bae00 R15: dffffc0000000000
FS:  00007ff9f858e6c0(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f434a99b000 CR3: 0000000188b4a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5c1/0x650
 hfs_btree_inc_height+0x100/0xad0
 hfs_brec_insert+0x7ef/0xc90
 __hfs_ext_write_extent+0x2a1/0x470
 __hfs_ext_cache_extent+0x6b/0x9b0
 hfs_extend_file+0x39b/0x15e0
 hfs_get_block+0x412/0xc50
 __block_write_begin_int+0x6c6/0x1910
 cont_write_begin+0x737/0xae0
 hfs_write_begin+0x66/0xb0
 cont_write_begin+0x2e7/0xae0
 hfs_write_begin+0x66/0xb0
 generic_perform_write+0x2e2/0x8f0
 generic_file_write_iter+0x14a/0x680
 do_iter_readv_writev+0x619/0x8c0
 vfs_writev+0x33c/0x990
 __se_sys_pwritev2+0x184/0x2a0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff9f779cdd9
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:00007ff9f858e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007ff9f7a16180 RCX: 00007ff9f779cdd9
RDX: 0000000000000001 RSI: 0000200000000100 RDI: 0000000000000008
RBP: 00007ff9f7832d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000005405 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff9f7a16218 R14: 00007ff9f7a16180 R15: 00007fffebd27a58
 </TASK>
