syzbot

bcachefs (loop0): dirent to missing inode:
  u64s 7 type dirent 4096:189491840996961599:U32_MAX len 0 ver 0: file0 -> 4098 type dir
  
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kernel BUG at fs/bcachefs/fs.c:61!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5307 Comm: syz-executor242 Not tainted 6.15.0-rc3-syzkaller-00076-ge72e9e693307 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:bch2_inode_update_after_write+0xac0/0xad0 fs/bcachefs/fs.c:61
Code: 48 89 df 49 89 df 48 89 d3 49 89 c6 e8 a9 83 f0 fd 4c 89 f0 4c 8b 74 24 18 48 89 da 4c 89 fb e9 7a fc ff ff e8 71 8e 8e fd 90 <0f> 0b 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90
RSP: 0018:ffffc9000d4bf940 EFLAGS: 00010293
RAX: ffffffff84313f0f RBX: 1ffff92001a97f34 RCX: ffff888000b68000
RDX: 0000000000000000 RSI: 0000000000001005 RDI: 0000000000001002
RBP: ffffc9000d4bfa70 R08: 0000000000001000 R09: 00000000ffffffff
R10: 0000000000001000 R11: 00000000ffffffff R12: dffffc0000000000
R13: ffff8880119e0000 R14: 0000000000001005 R15: 0000000000001002
FS:  000055558e7f7380(0000) GS:ffff88808d2a3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feb125c0100 CR3: 00000000441b8000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __bch2_unlink+0x428/0x4c0 fs/bcachefs/fs.c:818
 bch2_unlink+0xb1/0xf0 fs/bcachefs/fs.c:841
 vfs_unlink+0x391/0x650 fs/namei.c:4579
 do_unlinkat+0x350/0x560 fs/namei.c:4643
 __do_sys_unlink fs/namei.c:4689 [inline]
 __se_sys_unlink fs/namei.c:4687 [inline]
 __x64_sys_unlink+0x47/0x50 fs/namei.c:4687
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feb12543c99
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 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:00007ffcf96100b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007feb12543c99
RDX: 00007feb12543c99 RSI: 0000000000000000 RDI: 0000200000000500
RBP: 0030656c69662f2e R08: 000055558e7f84c0 R09: 000055558e7f84c0
R10: 000055558e7f84c0 R11: 0000000000000246 R12: 00007ffcf96100e0
R13: 00007ffcf9610308 R14: 431bde82d7b634db R15: 00007feb1258c03b
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_inode_update_after_write+0xac0/0xad0 fs/bcachefs/fs.c:61
Code: 48 89 df 49 89 df 48 89 d3 49 89 c6 e8 a9 83 f0 fd 4c 89 f0 4c 8b 74 24 18 48 89 da 4c 89 fb e9 7a fc ff ff e8 71 8e 8e fd 90 <0f> 0b 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90
RSP: 0018:ffffc9000d4bf940 EFLAGS: 00010293
RAX: ffffffff84313f0f RBX: 1ffff92001a97f34 RCX: ffff888000b68000
RDX: 0000000000000000 RSI: 0000000000001005 RDI: 0000000000001002
RBP: ffffc9000d4bfa70 R08: 0000000000001000 R09: 00000000ffffffff
R10: 0000000000001000 R11: 00000000ffffffff R12: dffffc0000000000
R13: ffff8880119e0000 R14: 0000000000001005 R15: 0000000000001002
FS:  000055558e7f7380(0000) GS:ffff88808d2a3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feb125c0100 CR3: 00000000441b8000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400