bcachefs (loop1): bucket 0:35 data type btree ptr gen 0 missing in alloc btree
  while marking u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq c0bef60d07ceb940 written 16 min_key POS_MIN durability: 1 ptr: 0:35:0 gen 0, fixing
------------[ cut here ]------------
kernel BUG at fs/bcachefs/btree_iter.c:633!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 6582 Comm: syz.1.131 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:bch2_btree_path_level_init+0xa01/0xa20
Code: fd 90 0f 0b e8 c0 43 99 fd 90 0f 0b e8 b8 43 99 fd 90 0f 0b e8 b0 43 99 fd 90 0f 0b e8 a8 43 99 fd 90 0f 0b e8 a0 43 99 fd 90 <0f> 0b e8 98 43 99 fd 90 0f 0b e8 90 43 99 fd 90 0f 0b 66 66 66 66
RSP: 0018:ffffc90006aa64a0 EFLAGS: 00010293
RAX: ffffffff84266790 RBX: ffff888034ab0360 RCX: ffff8880200f1cc0
RDX: 0000000000000000 RSI: 000d280000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000d54c88 R12: 000d280000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f096ecd76c0(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6a1e706000 CR3: 0000000023798000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 bch2_btree_path_traverse_one+0xfec/0x21d0
 bch2_btree_iter_peek_max+0x9e8/0x58f0
 bch2_check_allocations+0x120d/0x57b0
 __bch2_run_recovery_passes+0x3bd/0x1060
 bch2_run_recovery_passes+0x184/0x210
 bch2_fs_recovery+0x2690/0x3a50
 bch2_fs_start+0xaaf/0xda0
 bch2_fs_get_tree+0xb39/0x1520
 vfs_get_tree+0x92/0x2b0
 do_new_mount+0x2a2/0x9e0
 __se_sys_mount+0x317/0x410
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f096dd9038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f096ecd6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f096ecd6ef0 RCX: 00007f096dd9038a
RDX: 00002000000000c0 RSI: 0000200000000100 RDI: 00007f096ecd6eb0
RBP: 00002000000000c0 R08: 00007f096ecd6ef0 R09: 000000000000001e
R10: 000000000000001e R11: 0000000000000246 R12: 0000200000000100
R13: 00007f096ecd6eb0 R14: 00000000000059f3 R15: 0000200000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_btree_path_level_init+0xa01/0xa20
Code: fd 90 0f 0b e8 c0 43 99 fd 90 0f 0b e8 b8 43 99 fd 90 0f 0b e8 b0 43 99 fd 90 0f 0b e8 a8 43 99 fd 90 0f 0b e8 a0 43 99 fd 90 <0f> 0b e8 98 43 99 fd 90 0f 0b e8 90 43 99 fd 90 0f 0b 66 66 66 66
RSP: 0018:ffffc90006aa64a0 EFLAGS: 00010293

RAX: ffffffff84266790 RBX: ffff888034ab0360 RCX: ffff8880200f1cc0
RDX: 0000000000000000 RSI: 000d280000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000d54c88 R12: 000d280000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f096ecd76c0(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6a1efff000 CR3: 0000000023798000 CR4: 00000000000006f0
