bcachefs (loop0): bucket 0:41 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 9aa2895aefce4bdf written 24 min_key POS_MIN durability: 1 ptr: 0:41:0 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: 6247 Comm: syz.0.43 Not tainted 6.16.0-rc5-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:bch2_btree_path_level_init+0x9f9/0xa20 fs/bcachefs/btree_iter.c:633
Code: 91 fb ff ff e8 28 b7 a0 fd 90 0f 0b e8 20 b7 a0 fd 90 0f 0b e8 18 b7 a0 fd 90 0f 0b e8 10 b7 a0 fd 90 0f 0b e8 08 b7 a0 fd 90 <0f> 0b e8 00 b7 a0 fd 90 0f 0b e8 f8 b6 a0 fd 90 0f 0b e8 f0 b6 a0
RSP: 0018:ffffc9000503e540 EFLAGS: 00010246
RAX: ffffffff841f6dd8 RBX: ffff88805afc8360 RCX: 0000000000080000
RDX: ffffc9000bbc9000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000a07c9c R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000ffff
FS:  00007f3a42d716c0(0000) GS:ffff888125c51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa19afab000 CR3: 00000000273b0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 btree_path_lock_root fs/bcachefs/btree_iter.c:787 [inline]
 bch2_btree_path_traverse_one+0xfec/0x21d0 fs/bcachefs/btree_iter.c:1203
 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:250 [inline]
 __bch2_btree_iter_peek fs/bcachefs/btree_iter.c:2267 [inline]
 bch2_btree_iter_peek_max+0x9e8/0x58f0 fs/bcachefs/btree_iter.c:2384
 bch2_btree_iter_peek_max_type fs/bcachefs/btree_iter.h:743 [inline]
 bch2_gc_btree fs/bcachefs/btree_gc.c:729 [inline]
 bch2_gc_btrees fs/bcachefs/btree_gc.c:792 [inline]
 bch2_check_allocations+0x120d/0x57b0 fs/bcachefs/btree_gc.c:1094
 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:484 [inline]
 __bch2_run_recovery_passes+0x395/0x1010 fs/bcachefs/recovery_passes.c:539
 bch2_run_recovery_passes+0x184/0x210 fs/bcachefs/recovery_passes.c:610
 bch2_fs_recovery+0x2690/0x3a50 fs/bcachefs/recovery.c:1005
 bch2_fs_start+0xaaf/0xda0 fs/bcachefs/super.c:1213
 bch2_fs_get_tree+0xb39/0x1520 fs/bcachefs/fs.c:2488
 vfs_get_tree+0x8f/0x2b0 fs/super.c:1804
 do_new_mount+0x24a/0xa40 fs/namespace.c:3902
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3a41f900ca
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:00007f3a42d70e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f3a42d70ef0 RCX: 00007f3a41f900ca
RDX: 00002000000000c0 RSI: 00002000000004c0 RDI: 00007f3a42d70eb0
RBP: 00002000000000c0 R08: 00007f3a42d70ef0 R09: 0000000000800000
R10: 0000000000800000 R11: 0000000000000246 R12: 00002000000004c0
R13: 00007f3a42d70eb0 R14: 0000000000005946 R15: 0000200000000480
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_btree_path_level_init+0x9f9/0xa20 fs/bcachefs/btree_iter.c:633
Code: 91 fb ff ff e8 28 b7 a0 fd 90 0f 0b e8 20 b7 a0 fd 90 0f 0b e8 18 b7 a0 fd 90 0f 0b e8 10 b7 a0 fd 90 0f 0b e8 08 b7 a0 fd 90 <0f> 0b e8 00 b7 a0 fd 90 0f 0b e8 f8 b6 a0 fd 90 0f 0b e8 f0 b6 a0
RSP: 0018:ffffc9000503e540 EFLAGS: 00010246
RAX: ffffffff841f6dd8 RBX: ffff88805afc8360 RCX: 0000000000080000
RDX: ffffc9000bbc9000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000a07c9c R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000ffff
FS:  00007f3a42d716c0(0000) GS:ffff888125c51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd6ed02de8 CR3: 00000000273b0000 CR4: 00000000003526f0