bcachefs (loop3): btree_node_read_work: rewriting btree node at due to error
  btree=alloc level=0 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq ac62141f8dc7e261 written 24 min_key POS_MIN durability: 1 ptr: 0:26:0 gen 0
bcachefs (loop3): pointer to nonexistent device 8
------------[ cut here ]------------
unhandled error case in bch2_bkey_pick_read_device
WARNING: CPU: 1 PID: 6631 at fs/bcachefs/extents.c:230 bch2_bkey_pick_read_device+0x17a5/0x1a00 fs/bcachefs/extents.c:230
Modules linked in:
CPU: 1 UID: 0 PID: 6631 Comm: syz.3.131 Not tainted 6.14.0-syzkaller-09584-g7d06015d936c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:bch2_bkey_pick_read_device+0x17a5/0x1a00 fs/bcachefs/extents.c:230
Code: 91 be 59 fd e9 d0 fd ff ff e8 87 be 59 fd c6 05 9d 39 dd 0b 01 90 48 c7 c7 e0 9c 93 8c 48 c7 c6 40 52 58 8e e8 bc ce 18 fd 90 <0f> 0b 90 90 e9 bc fe ff ff e8 5d be 59 fd e9 6e ff ff ff 89 d9 80
RSP: 0018:ffffc900015b6de0 EFLAGS: 00010246
RAX: d675fbce14676e00 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000ca49000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900015b7010 R08: ffffffff81829c92 R09: fffffbfff1d7a73c
R10: dffffc0000000000 R11: fffffbfff1d7a73c R12: dffffc0000000000
R13: 1ffff920002b6de4 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fd35e65e6c0(0000) GS:ffff888125111000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f648f966000 CR3: 00000000323e2000 CR4: 00000000003526f0
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: 0033:0x7fd35d78e90a
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:00007fd35e65de68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fd35e65def0 RCX: 00007fd35d78e90a
RDX: 0000200000000000 RSI: 0000200000000100 RDI: 00007fd35e65deb0
RBP: 0000200000000000 R08: 00007fd35e65def0 R09: 0000000000800800
R10: 0000000000800800 R11: 0000000000000246 R12: 0000200000000100
R13: 00007fd35e65deb0 R14: 0000000000005997 R15: 0000200000000c80
 </TASK>