------------[ cut here ]------------
WARNING: CPU: 2 PID: 12695 at fs/nilfs2/btree.c:2283 nilfs_btree_assign+0x978/0xdf0 fs/nilfs2/btree.c:2283
Modules linked in:
CPU: 2 PID: 12695 Comm: segctord Not tainted 6.4.0-rc4-syzkaller-00078-g929ed21dfdb6 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:nilfs_btree_assign+0x978/0xdf0 fs/nilfs2/btree.c:2283
Code: 00 00 00 00 e9 83 f8 ff ff e8 94 5b 56 fe 44 89 e6 bf fe ff ff ff e8 a7 57 56 fe 41 83 fc fe 0f 85 8a fb ff ff e8 78 5b 56 fe <0f> 0b e9 7e fb ff ff e8 6c 5b 56 fe 48 89 eb 48 c7 44 24 28 18 00
RSP: 0018:ffffc9000423f9f0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff888061fd9780 RSI: ffffffff832d09c8 RDI: 0000000000000005
RBP: ffff888033f61800 R08: 0000000000000005 R09: 00000000fffffffe
R10: 00000000fffffffe R11: 0000000000094001 R12: 00000000fffffffe
R13: ffffc9000423fc78 R14: ffffc9000423fcb8 R15: 0000000000000082
FS:  0000000000000000(0000) GS:ffff88806b800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020007f82 CR3: 00000000206ac000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 nilfs_bmap_assign+0x87/0x180 fs/nilfs2/bmap.c:390
 nilfs_segctor_update_payload_blocknr fs/nilfs2/segment.c:1617 [inline]
 nilfs_segctor_assign fs/nilfs2/segment.c:1651 [inline]
 nilfs_segctor_do_construct+0x14d2/0x7200 fs/nilfs2/segment.c:2081
 nilfs_segctor_construct+0x8e3/0xb30 fs/nilfs2/segment.c:2404
 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2512 [inline]
 nilfs_segctor_thread+0x3c7/0xf30 fs/nilfs2/segment.c:2595
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>