bi_data_checksum=0
  bi_compression=0
  bi_project=0
  bi_background_compression=0
  bi_data_replicas=0
  bi_promote_target=0
  bi_foreground_target=0
  bi_background_target=0
  bi_erasure_code=0
  bi_fields_set=0
  bi_dir=0
  bi_dir_offset=4096
  bi_subvol=0
  bi_parent_subvol=0
  bi_nocow=0, fixing
 done
bcachefs (loop0): resume_logged_ops... done
bcachefs (loop0): delete_dead_inodes... done
bcachefs (loop0): Fixed errors, running fsck a second time to verify fs is clean
bcachefs (loop0): check_inodes... done
bcachefs (loop0): resume_logged_ops... done
bcachefs (loop0): delete_dead_inodes... done
bcachefs (loop0): done starting filesystem
bcachefs (loop0): non free bucket in freespace btree
  freespace key u64s 5 type set 0:29:0 len 2 ver 0
  u64s 12 type alloc_v4 0:27:0 len 0 ver 0: 
  gen 0 oldest_gen 0 data_type btree
  journal_seq       4
  need_discard      1
  need_inc_gen      1
  dirty_sectors     256
  stripe_sectors    0
  cached_sectors    0
  stripe            0
  stripe_redundancy 0
  io_time[READ]     1
  io_time[WRITE]    256
  fragmentation     0
  bp_start          8
2 transaction updates for bch2_truncate journal seq 0
  update: btree=logged_ops cached=0 __bch2_logged_op_start fs/bcachefs/logged_ops.c:85 [inline]
  update: btree=logged_ops cached=0 bch2_logged_op_start+0x181/0x310 fs/bcachefs/logged_ops.c:92
    old u64s 5 type deleted 0:1:0 len 0 ver 0
    new u64s 8 type logged_op_truncate 0:1:0 len 0 ver 0: subvol=1 inum=536870912 new_i_size=0
  update: btree=logged_ops cached=1 __bch2_logged_op_start fs/bcachefs/logged_ops.c:85 [inline]
  update: btree=logged_ops cached=1 bch2_logged_op_start+0x181/0x310 fs/bcachefs/logged_ops.c:92
    old u64s 5 type deleted 0:1:0 len 0 ver 0
    new u64s 8 type logged_op_truncate 0:1:0 len 0 ver 0: subvol=1 inum=536870912 new_i_size=0
bcachefs (loop0): bch2_btree_update_start(): error EIO
syzkaller1: entered promiscuous mode
syzkaller1: entered allmulticast mode
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5318 at fs/bcachefs/fs-io.c:315 __bch2_truncate_folio+0x22aa/0x26b0 fs/bcachefs/fs-io.c:315
Modules linked in:
CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted 6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #0
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_truncate_folio+0x22aa/0x26b0 fs/bcachefs/fs-io.c:315
Code: 41 5f 5d c3 cc cc cc cc e8 a3 b1 67 fd 48 c7 c7 c1 58 11 8e e8 17 8b e8 ff 89 05 71 42 1d 16 e9 2c e0 ff ff e8 87 b1 67 fd 90 <0f> 0b 90 e9 88 f8 ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c ff
RSP: 0018:ffffc9000d517900 EFLAGS: 00010283
RAX: ffffffff8437c259 RBX: 0000000000000000 RCX: 0000000000100000
RDX: ffffc9000e7a9000 RSI: 0000000000000e91 RDI: 0000000000000e92
RBP: ffffc9000d517bf0 R08: ffffffff8437badc R09: 1ffffd40001ae6c0
R10: dffffc0000000000 R11: fffff940001ae6c1 R12: 1ffff1100a9248fa
R13: ffffc9000d517b80 R14: ffff8880549247d0 R15: 0000000000000000
FS:  00007fd4f44056c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000f000 CR3: 000000004258a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_truncate_folios fs/bcachefs/fs-io.c:354 [inline]
 bchfs_fpunch+0x115/0x780 fs/bcachefs/fs-io.c:508
 bch2_fallocate_dispatch+0x3e4/0x540 fs/bcachefs/fs-io.c:782
 vfs_fallocate+0x569/0x6e0 fs/open.c:327
 ksys_fallocate fs/open.c:351 [inline]
 __do_sys_fallocate fs/open.c:356 [inline]
 __se_sys_fallocate fs/open.c:354 [inline]
 __x64_sys_fallocate+0xbc/0x110 fs/open.c:354
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd4f3585d29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fd4f4405038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fd4f3775fa0 RCX: 00007fd4f3585d29
RDX: 0000000000000003 RSI: 0000000000000003 RDI: 0000000000000009
RBP: 00007fd4f3601b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000404042bbe R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd4f3775fa0 R15: 00007ffc58f4b918
 </TASK>