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
  ret fsck_errors_not_fixed
bcachefs (loop0): invalid bkey in btree_node btree=alloc level=0: u64s 13 type alloc_v4 0:23:0 len 0 ver 0: 
    gen 0 oldest_gen 0 data_type sb
    journal_seq_nonempty 1
    journal_seq_empty    0
    need_discard         1
    need_inc_gen         1
    dirty_sectors        32
    stripe_sectors       0
    cached_sectors       0
    stripe               255
    stripe_redundancy    0
    io_time[READ]        1
    io_time[WRITE]       18446744073709289729
    fragmentation     0
    bp_start          8
  
  invalid data type (got 1 should be 7), deleting
bcachefs (loop0): invalid bkey in btree_node btree=alloc level=0: u64s 13 type alloc_v4 0:257:4278190080 len 0 ver 0: 
    gen 0 oldest_gen 0 data_type sb
    journal_seq_nonempty 5
    journal_seq_empty    0
    need_discard         1
    need_inc_gen         1
    dirty_sectors        32
    stripe_sectors       0
    cached_sectors       0
    stripe               0
    stripe_redundancy    0
    io_time[READ]        1
    io_time[WRITE]       128
    fragmentation     0
    bp_start          8
  
  nonzero snapshot, deleting
------------[ cut here ]------------
kernel BUG at fs/bcachefs/journal.h:245!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 11 Comm: kworker/0:0H 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
Workqueue: bcachefs_btree_write_complete btree_node_write_work
RIP: 0010:bch2_journal_add_entry fs/bcachefs/journal.h:245 [inline]
RIP: 0010:bch2_trans_commit_write_locked fs/bcachefs/btree_trans_commit.c:750 [inline]
RIP: 0010:do_bch2_trans_commit fs/bcachefs/btree_trans_commit.c:854 [inline]
RIP: 0010:__bch2_trans_commit+0x82e7/0x8870 fs/bcachefs/btree_trans_commit.c:1085
Code: e8 5e 44 90 fd 48 8b 7c 24 28 e8 a4 91 fe ff e9 8a b6 ff ff e8 4a 44 90 fd 90 0f 0b e8 42 44 90 fd 90 0f 0b e8 3a 44 90 fd 90 <0f> 0b e8 32 44 90 fd 90 0f 0b f3 0f 1e fa 48 8b 44 24 70 42 80 3c
RSP: 0018:ffffc900001d7140 EFLAGS: 00010293
RAX: ffffffff842f8666 RBX: ffff888054b630e0 RCX: ffff88801c6fa440
RDX: 0000000000000000 RSI: 000000000000000b RDI: 0000000000000007
RBP: ffffc900001d7430 R08: ffffffffffffffff R09: ffffffffffffffff
R10: ffffffff00000000 R11: ffffffffffffffff R12: 0000000000000007
R13: 000000000000000b R14: 1ffff1100a83001d R15: 0000000000000007
FS:  0000000000000000(0000) GS:ffff88808d007000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb55a7909c0 CR3: 0000000043722000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 bch2_trans_commit fs/bcachefs/btree_update.h:241 [inline]
 __bch2_btree_node_update_key fs/bcachefs/btree_update_interior.c:2530 [inline]
 bch2_btree_node_update_key+0x1ab7/0x3030 fs/bcachefs/btree_update_interior.c:2598
 bch2_btree_node_update_key_get_iter+0x5ad/0x640 fs/bcachefs/btree_update_interior.c:2622
 btree_node_write_work+0x763/0xc40 fs/bcachefs/btree_io.c:2203
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_journal_add_entry fs/bcachefs/journal.h:245 [inline]
RIP: 0010:bch2_trans_commit_write_locked fs/bcachefs/btree_trans_commit.c:750 [inline]
RIP: 0010:do_bch2_trans_commit fs/bcachefs/btree_trans_commit.c:854 [inline]
RIP: 0010:__bch2_trans_commit+0x82e7/0x8870 fs/bcachefs/btree_trans_commit.c:1085
Code: e8 5e 44 90 fd 48 8b 7c 24 28 e8 a4 91 fe ff e9 8a b6 ff ff e8 4a 44 90 fd 90 0f 0b e8 42 44 90 fd 90 0f 0b e8 3a 44 90 fd 90 <0f> 0b e8 32 44 90 fd 90 0f 0b f3 0f 1e fa 48 8b 44 24 70 42 80 3c
RSP: 0018:ffffc900001d7140 EFLAGS: 00010293
RAX: ffffffff842f8666 RBX: ffff888054b630e0 RCX: ffff88801c6fa440
RDX: 0000000000000000 RSI: 000000000000000b RDI: 0000000000000007
RBP: ffffc900001d7430 R08: ffffffffffffffff R09: ffffffffffffffff
R10: ffffffff00000000 R11: ffffffffffffffff R12: 0000000000000007
R13: 000000000000000b R14: 1ffff1100a83001d R15: 0000000000000007
FS:  0000000000000000(0000) GS:ffff88808d007000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb55a7909c0 CR3: 0000000051a87000 CR4: 0000000000352ef0