bcachefs (loop0): Using encoding defined by superblock: utf8-12.1.0
bcachefs (loop0): recovering from clean shutdown, journal seq 15
bcachefs (loop0): Doing compatible version upgrade from 1.13: inode_has_child_snapshots to 1.28: inode_has_case_insensitive
  running recovery passes: check_allocations,check_extents_to_backpointers,check_inodes
bcachefs (loop0): btree node read error at btree extents level 0/0
  u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq c70ab18f40f86f94 written 24 min_key POS_MIN durability: 1 ptr: 0:167:0 gen 0
  loop0 node offset 16/24 bset u64s 0: empty bset
  loop0 btree validate error
  flagging btree extents lost data
  running recovery pass check_topology (2), currently at recovery_pass_empty (0)
  running recovery pass check_lrus (14), currently at recovery_pass_empty (0)
  running recovery pass check_backpointers_to_extents (16), currently at recovery_pass_empty (0)
  running recovery pass check_topology (2), currently at recovery_pass_empty (0)
  running recovery pass scan_for_btree_nodes (1), currently at recovery_pass_empty (0)
  ret fsck_errors_not_fixed
bcachefs (loop0): error reading btree root btree=extents level=0: btree_node_read_error, fixing
bcachefs (loop0): btree node read error at btree alloc level 1/1
  u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 3a29d24e27fd9a2e written 65534 min_key R 0:0:16777215 durability: 1 ptr: 0:178:0 gen 0
  loop0 node offset 16/65534: btree node data missing: expected 65534 sectors, found 16
  loop0 btree validate error
  repair success (rewriting node)
bcachefs (loop0): error reading btree root btree=accounting level=0: btree_node_read_error, fixing
bcachefs (loop0): check_topology...
bcachefs (loop0): btree root extents unreadable, must recover from scan
bcachefs (loop0): running recovery pass scan_for_btree_nodes (1), currently at check_topology (2) - rewinding
bcachefs (loop0): bch2_check_root(): error restart_recovery
bcachefs (loop0): scan_for_btree_nodes...
bcachefs (loop0): btree node scan found 1 nodes after overwrites
 done
bcachefs (loop0): check_topology...
bcachefs (loop0): btree root extents unreadable, must recover from scan
bcachefs (loop0): bch2_get_scanned_nodes(): recovery btree=extents level=0 POS_MIN - SPOS_MAX
bcachefs (loop0): bch2_get_scanned_nodes(): recovering u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq c70ab18f40f86f94 written 24 min_key POS_MIN durability: 1 ptr: 0:167:0 gen 0
bcachefs (loop0): empty interior btree node at btree=extents level=1
  u64s 5 type btree_ptr SPOS_MAX len 0 ver 0, fixing
bcachefs (loop0): bch2_btree_repair_topology_recurse(): error ECHILD
bcachefs (loop0): empty btree root extents
bcachefs (loop0): btree node with incorrect min_key  at btree=alloc level=1:
  parent: u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 3a29d24e27fd9a2e written 65534 min_key R 0:0:16777215 durability: 1 ptr: 0:178:0 gen 0
  next: u64s 11 type btree_ptr_v2 0:82:0 len 0 ver 0: seq af8d2de42da20fd1 written 16 min_key POS_MIN durability: 1 ptr: 0:141:0 gen 0, fixing
bcachefs (loop0): set_node_min(): u64s 11 type btree_ptr_v2 0:82:0 len 0 ver 0: seq af8d2de42da20fd1 written 16 min_key POS_MIN durability: 1 ptr: 0:141:0 gen 0 -> 0:0:16777215
bcachefs (loop0): btree node with incorrect max_key
  at: btree=alloc level=1
  parent: u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 3a29d24e27fd9a2e written 65534 min_key R 0:0:16777215 durability: 1 ptr: 0:178:0 gen 0
  child: u64s 11 type btree_ptr_v2 0:82:0 len 0 ver 0: seq af8d2de42da20fd1 written 16 min_key R 0:0:16777215 durability: 1 ptr: 0:141:0 gen 0, fixing
bcachefs (loop0): set_node_max(): u64s 11 type btree_ptr_v2 0:82:0 len 0 ver 0: seq af8d2de42da20fd1 written 16 min_key R 0:0:16777215 durability: 1 ptr: 0:141:0 gen 0 -> SPOS_MAX
bcachefs (loop0): btree root with incorrect min_key: 0:0:16777215
  btree=alloc level=1 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 3a29d24e27fd9a2e written 65534 min_key R 0:0:16777215 durability: 1 ptr: 0:178:0 gen 0
  btree topology error: 
------------[ cut here ]------------
kernel BUG at fs/bcachefs/btree_gc.c:528!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5363 Comm: syz.0.0 Not tainted syzkaller #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_btree_repair_topology_recurse+0x52dc/0x52e0 fs/bcachefs/btree_gc.c:528
Code: fd 90 0f 0b e8 25 d4 9a fd 90 0f 0b e8 1d d4 9a fd 90 0f 0b e8 15 d4 9a fd 90 0f 0b e8 0d d4 9a fd 90 0f 0b e8 05 d4 9a fd 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f
RSP: 0018:ffffc9000d296a60 EFLAGS: 00010287
RAX: ffffffff8424e73b RBX: 00000000fffff6e8 RCX: 0000000000100000
RDX: ffffc9000defa000 RSI: 0000000000063c3e RDI: 0000000000063c3f
RBP: ffffc9000d296f90 R08: ffffffff8fa3b037 R09: 1ffffffff1f47606
R10: dffffc0000000000 R11: fffffbfff1f47607 R12: ffff888041ebcf00
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888052e98000
FS:  00007fa3f592d6c0(0000) GS:ffff88808d20d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe9eab5b000 CR3: 000000003f892000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 bch2_check_topology+0x692/0xe00 fs/bcachefs/btree_gc.c:602
 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:484 [inline]
 __bch2_run_recovery_passes+0x3bd/0x1060 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:1016
 bch2_fs_start+0xaaf/0xda0 fs/bcachefs/super.c:1213
 bch2_fs_get_tree+0xb39/0x1520 fs/bcachefs/fs.c:2488
 vfs_get_tree+0x92/0x2b0 fs/super.c:1815
 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4324
 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: 0033:0x7fa3f4b9038a
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:00007fa3f592ce68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fa3f592cef0 RCX: 00007fa3f4b9038a
RDX: 0000200000000100 RSI: 0000200000004940 RDI: 00007fa3f592ceb0
RBP: 0000200000000100 R08: 00007fa3f592cef0 R09: 0000000000200041
R10: 0000000000200041 R11: 0000000000000246 R12: 0000200000004940
R13: 00007fa3f592ceb0 R14: 0000000000004978 R15: 0000200000000140
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_btree_repair_topology_recurse+0x52dc/0x52e0 fs/bcachefs/btree_gc.c:528
Code: fd 90 0f 0b e8 25 d4 9a fd 90 0f 0b e8 1d d4 9a fd 90 0f 0b e8 15 d4 9a fd 90 0f 0b e8 0d d4 9a fd 90 0f 0b e8 05 d4 9a fd 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f
RSP: 0018:ffffc9000d296a60 EFLAGS: 00010287
RAX: ffffffff8424e73b RBX: 00000000fffff6e8 RCX: 0000000000100000
RDX: ffffc9000defa000 RSI: 0000000000063c3e RDI: 0000000000063c3f
RBP: ffffc9000d296f90 R08: ffffffff8fa3b037 R09: 1ffffffff1f47606
R10: dffffc0000000000 R11: fffffbfff1f47607 R12: ffff888041ebcf00
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888052e98000
FS:  00007fa3f592d6c0(0000) GS:ffff88808d20d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe9eab5b000 CR3: 000000003f892000 CR4: 0000000000352ef0