hfsplus: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3397 at fs/hfsplus/bnode.c:584 hfsplus_bnode_create.cold+0x27/0x4e fs/hfsplus/bnode.c:584
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3397 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x5a kernel/panic.c:541
 report_bug+0x262/0x2b0 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:hfsplus_bnode_create.cold+0x27/0x4e fs/hfsplus/bnode.c:584
Code: b3 05 fa e8 8b 3f 6c f9 4c 89 ef e8 13 0a 23 00 89 ee 48 c7 c7 20 85 7d 88 e8 e0 70 fd ff 48 c7 c7 80 85 7d 88 e8 d4 70 fd ff <0f> 0b e9 47 c6 05 fa e8 5d 3f 6c f9 89 ee 48 c7 c7 c0 82 7d 88 e8
RSP: 0018:ffff888046f47208 EFLAGS: 00010286
RAX: 0000000000000024 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000020717 RSI: ffffffff814dff01 RDI: ffffed1008de8e33
RBP: 0000000000000000 R08: 0000000000000024 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880b4f5a200
R13: ffff88804685a650 R14: ffff88804685a580 R15: 0000000000000000
 hfsplus_bmap_alloc+0x70b/0x800 fs/hfsplus/btree.c:414
 hfs_btree_inc_height.isra.0+0xe6/0x9e0 fs/hfsplus/brec.c:475
 hfsplus_brec_insert+0x9e1/0xc20 fs/hfsplus/brec.c:75
 __hfsplus_ext_write_extent+0x489/0x5a0 fs/hfsplus/extents.c:107
 __hfsplus_ext_cache_extent fs/hfsplus/extents.c:186 [inline]
 hfsplus_ext_read_extent+0x910/0xab0 fs/hfsplus/extents.c:218
 hfsplus_file_extend+0x672/0xf40 fs/hfsplus/extents.c:461
 hfsplus_get_block+0x196/0x960 fs/hfsplus/extents.c:245
 __block_write_begin_int+0x46c/0x17b0 fs/buffer.c:1978
 __block_write_begin fs/buffer.c:2028 [inline]
 block_write_begin+0x58/0x2e0 fs/buffer.c:2087
 cont_write_begin+0x55a/0x820 fs/buffer.c:2440
 hfsplus_write_begin+0x87/0x150 fs/hfsplus/inode.c:52
 generic_perform_write+0x1f8/0x4d0 mm/filemap.c:3170
 __generic_file_write_iter+0x24b/0x610 mm/filemap.c:3295
 generic_file_write_iter+0x3f8/0x730 mm/filemap.c:3323
 call_write_iter include/linux/fs.h:1821 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x51b/0x770 fs/read_write.c:487
 vfs_write+0x1f3/0x540 fs/read_write.c:549
 ksys_write+0x12b/0x2a0 fs/read_write.c:599
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f5c74fea0d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5c7355c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f5c75109f80 RCX: 00007f5c74fea0d9
RDX: 00000000fffffdef RSI: 0000000020000040 RDI: 0000000000000004
RBP: 00007f5c75045ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc5943cd1f R14: 00007f5c7355c300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..