NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
------------[ cut here ]------------
ret == -ENOENT
WARNING: fs/nilfs2/btree.c:2302 at nilfs_btree_assign+0xa84/0xce0 fs/nilfs2/btree.c:2302, CPU#0: segctord/5333
Modules linked in:
CPU: 0 UID: 0 PID: 5333 Comm: segctord Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:nilfs_btree_assign+0xa84/0xce0 fs/nilfs2/btree.c:2302
Code: 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 2e d3 14 fe 49 bf 00 00 00 00 00 fc ff df eb 9f e8 1d d3 14 fe 90 <0f> 0b 90 41 be fe ff ff ff 49 bf 00 00 00 00 00 fc ff df eb 84 e8
RSP: 0018:ffffc9000fa67560 EFLAGS: 00010293
RAX: ffffffff83b0fbc3 RBX: ffff888011eccc48 RCX: ffff888000374a00
RDX: 0000000000000000 RSI: 00000000fffffffe RDI: 00000000fffffffe
RBP: ffffc9000fa67690 R08: 0000000000000002 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1008f54201 R12: 1ffff92001f4cebc
R13: ffffc9000fa67a20 R14: 00000000fffffffe R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff88808c885000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f25b95ff000 CR3: 000000001fc4c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 nilfs_bmap_assign+0x92/0x170 fs/nilfs2/bmap.c:374
 nilfs_segctor_update_payload_blocknr fs/nilfs2/segment.c:1640 [inline]
 nilfs_segctor_assign fs/nilfs2/segment.c:1674 [inline]
 nilfs_segctor_do_construct+0x3966/0x76c0 fs/nilfs2/segment.c:2133
 nilfs_segctor_construct+0x17b/0x690 fs/nilfs2/segment.c:2462
 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2570 [inline]
 nilfs_segctor_thread+0x6c0/0xdc0 fs/nilfs2/segment.c:2684
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>