loop0: detected capacity change from 0 to 32768
bcachefs (loop0): starting version 1.7: mi_btree_bitmap opts=metadata_checksum=none,data_checksum=none,compression=lz4,nojournal_transaction_names
bcachefs (loop0): recovering from clean shutdown, journal seq 10
bcachefs (loop0): Version upgrade required:
Version upgrade from 0.24: unwritten_extents to 1.7: mi_btree_bitmap incomplete
Doing incompatible version upgrade from 0.24: unwritten_extents to 1.25: extent_flags
  running recovery passes: check_allocations,check_alloc_info,check_lrus,check_btree_backpointers,check_backpointers_to_extents,check_extents_to_backpointers,check_alloc_to_lru_refs,bucket_gens_init,check_snapshot_trees,check_snapshots,check_subvols,check_subvol_children,delete_dead_snapshots,check_inodes,check_extents,check_indirect_extents,check_dirents,check_xattrs,check_root,check_unreachable_inodes,check_subvolume_structure,check_directory_structure,check_nlinks,set_fs_needs_rebalance
bcachefs (loop0): error validating btree node on loop0 at btree alloc level 0/0
  u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq ac62141f8dc7e261 written 24 min_key 256:72057594037927936:0 durability: 1 ptr: 0:26:0 gen 0  
  node offset 0/24: incorrect min_key: got POS_MIN should be 256:72057594037927936:0
bcachefs (loop0): running explicit recovery pass check_topology (2), currently at recovery_pass_empty (0)
bcachefs (loop0): flagging btree alloc lost data
error reading btree root btree=alloc level=0: btree_node_read_error, fixing
bcachefs (loop0): pointer to nonexistent device 12
bcachefs (loop0): inconsistency detected - emergency read only at journal seq 10
------------[ cut here ]------------
unhandled error case in bch2_bkey_pick_read_device
WARNING: CPU: 0 PID: 5327 at fs/bcachefs/extents.c:230 bch2_bkey_pick_read_device+0x17a5/0x1a00 fs/bcachefs/extents.c:230
Modules linked in:
CPU: 0 UID: 0 PID: 5327 Comm: syz.0.0 Not tainted 6.14.0-syzkaller-10514-g7f2ff7b62617 #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_bkey_pick_read_device+0x17a5/0x1a00 fs/bcachefs/extents.c:230
Code: a1 84 57 fd e9 d0 fd ff ff e8 97 84 57 fd c6 05 95 39 dd 0b 01 90 48 c7 c7 a0 a9 93 8c 48 c7 c6 17 c2 5a 8e e8 4c 8f 16 fd 90 <0f> 0b 90 90 e9 bc fe ff ff e8 6d 84 57 fd e9 6e ff ff ff 89 d9 80
RSP: 0018:ffffc9000d416de0 EFLAGS: 00010246
RAX: 6eaea6ab00e64600 RBX: 0000000000000000 RCX: 0000000000100000
RDX: ffffc9000e76a000 RSI: 000000000004581b RDI: 000000000004581c
RBP: ffffc9000d417010 R08: ffffffff81827862 R09: fffffbfff1d7a934
R10: dffffc0000000000 R11: fffffbfff1d7a934 R12: dffffc0000000000
R13: 1ffff92001a82de4 R14: 0000000000000000 R15: 0000000000000000
FS:  00007ff69f7c46c0(0000) GS:ffff88808c5b7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d11c5c3000 CR3: 0000000036d52000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_btree_node_read+0x7ac/0x29e0 fs/bcachefs/btree_io.c:1705
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1795 [inline]
 bch2_btree_root_read+0x656/0x7e0 fs/bcachefs/btree_io.c:1817
 read_btree_roots+0x3d7/0xa80 fs/bcachefs/recovery.c:581
 bch2_fs_recovery+0x28e4/0x3e20 fs/bcachefs/recovery.c:928
 bch2_fs_start+0x37c/0x620 fs/bcachefs/super.c:1057
 bch2_fs_get_tree+0x1270/0x18d0 fs/bcachefs/fs.c:2253
 vfs_get_tree+0x90/0x2b0 fs/super.c:1759
 do_new_mount+0x2cf/0xb70 fs/namespace.c:3878
 do_mount fs/namespace.c:4218 [inline]
 __do_sys_mount fs/namespace.c:4429 [inline]
 __se_sys_mount+0x38c/0x400 fs/namespace.c:4406
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff69e98e90a
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:00007ff69f7c3e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ff69f7c3ef0 RCX: 00007ff69e98e90a
RDX: 00002000000000c0 RSI: 0000200000000000 RDI: 00007ff69f7c3eb0
RBP: 00002000000000c0 R08: 00007ff69f7c3ef0 R09: 0000000000800000
R10: 0000000000800000 R11: 0000000000000246 R12: 0000200000000000
R13: 00007ff69f7c3eb0 R14: 00000000000059a6 R15: 0000200000000100
 </TASK>