syzbot

loop0: detected capacity change from 0 to 1024
hfsplus: new node 0 already hashed?
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WARNING: CPU: 1 PID: 4484 at fs/hfsplus/bnode.c:642 hfsplus_bnode_create+0x3d2/0x460 fs/hfsplus/bnode.c:641
Modules linked in:
CPU: 1 PID: 4484 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:hfsplus_bnode_create+0x3d2/0x460 fs/hfsplus/bnode.c:642
Code: 83 3f 8a 89 ee e8 7e 40 84 07 e9 52 fd ff ff e8 34 53 4b ff 4c 89 f7 e8 6c 56 98 07 48 c7 c7 60 83 3f 8a 89 ee e8 5e 40 84 07 <0f> 0b 49 c7 c5 ef ff ff ff eb b0 44 89 f9 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000321efb0 EFLAGS: 00010246
RAX: 0000000000000023 RBX: dffffc0000000000 RCX: 031eda544d8a8b00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff8880b9133d7f R09: 1ffff110172267af
R10: dffffc0000000000 R11: ffffed10172267b0 R12: 0000000000000000
R13: ffff888078462000 R14: ffff8880784620e0 R15: ffff88801a7d1d00
FS:  000055556ed5a500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000017000 CR3: 00000000708be000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hfsplus_bmap_alloc+0x698/0xa70 fs/hfsplus/btree.c:420
 hfs_btree_inc_height+0x109/0xb80 fs/hfsplus/brec.c:475
 hfsplus_brec_insert+0x13b/0xcc0 fs/hfsplus/brec.c:75
 __hfsplus_ext_write_extent+0x353/0x5b0 fs/hfsplus/extents.c:107
 __hfsplus_ext_cache_extent+0x89/0xe20 fs/hfsplus/extents.c:186
 hfsplus_ext_read_extent fs/hfsplus/extents.c:218 [inline]
 hfsplus_file_extend+0x4be/0x1a50 fs/hfsplus/extents.c:459
 hfsplus_get_block+0x430/0x15a0 fs/hfsplus/extents.c:245
 __block_write_begin_int+0x565/0x15d0 fs/buffer.c:2012
 __block_write_begin fs/buffer.c:2062 [inline]
 block_write_begin fs/buffer.c:2122 [inline]
 cont_write_begin+0x598/0x7b0 fs/buffer.c:2471
 hfsplus_write_begin+0x92/0xe0 fs/hfsplus/inode.c:53
 generic_perform_write+0x2b6/0x550 mm/filemap.c:3785
 __generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912
 generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944
 call_write_iter include/linux/fs.h:2173 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x745/0xd60 fs/read_write.c:594
 ksys_write+0x152/0x260 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f9692b6cdd9
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:00007ffce1220018 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9692de5fa0 RCX: 00007f9692b6cdd9
RDX: 000000000208e24b RSI: 0000200000000040 RDI: 0000000000000004
RBP: 00007f9692c02d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9692de5fac R14: 00007f9692de5fa0 R15: 00007f9692de5fa0
 </TASK>