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Subject[syzbot] WARNING in nilfs_btree_assign

syzbot found the following issue on:

HEAD commit: bf682942cd26 Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree: upstream
console output:
kernel config:
dashboard link:
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:
C reproducer:

Downloadable assets:
disk image:

IMPORTANT: if you fix the issue, please add the following tag to the commit:

------------[ cut here ]------------
WARNING: CPU: 1 PID: 5419 at fs/nilfs2/btree.c:2275 nilfs_btree_assign+0xa75/0xd00
Modules linked in:
CPU: 1 PID: 5419 Comm: segctord Not tainted 6.0.0-rc6-syzkaller-00210-gbf682942cd26 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
RIP: 0010:nilfs_btree_assign+0xa75/0xd00 fs/nilfs2/btree.c:2275
Code: 00 0f 85 a4 02 00 00 44 89 f8 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 17 03 41 fe 4c 8b 74 24 38 eb a5 e8 0b 03 41 fe <0f> 0b 41 bf fe ff ff ff 4c 8b 74 24 38 eb 91 44 89 f9 80 e1 07 80
RSP: 0018:ffffc900038675a0 EFLAGS: 00010293
RAX: ffffffff83468745 RBX: ffff888062904028 RCX: ffff88801c9ad880
RDX: 0000000000000000 RSI: 00000000fffffffe RDI: 00000000fffffffe
RBP: ffffc900038676d0 R08: ffffffff834680af R09: ffffed100cc669b4
R10: ffffed100cc669b4 R11: 1ffff1100cc669b3 R12: ffff88807be97800
R13: dffffc0000000000 R14: 0000000000000001 R15: 00000000fffffffe
FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200d9000 CR3: 00000000715c0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
nilfs_bmap_assign+0x87/0x150 fs/nilfs2/bmap.c:382
nilfs_segctor_update_payload_blocknr fs/nilfs2/segment.c:1589 [inline]
nilfs_segctor_assign fs/nilfs2/segment.c:1623 [inline]
nilfs_segctor_do_construct+0x3a49/0x6fe0 fs/nilfs2/segment.c:2050
nilfs_segctor_construct+0x143/0x8d0 fs/nilfs2/segment.c:2375
nilfs_segctor_thread_construct fs/nilfs2/segment.c:2483 [inline]
nilfs_segctor_thread+0x534/0x1180 fs/nilfs2/segment.c:2566
kthread+0x266/0x300 kernel/kthread.c:376

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