loop0: detected capacity change from 0 to 2048
NILFS (loop0): invalid segment: Magic number mismatch
NILFS (loop0): trying rollback from an earlier position
NILFS (loop0): recovery complete
NILFS (loop0): nilfs_sufile_do_free: segment 9 is already clean
------------[ cut here ]------------
ret == -ENOENT
WARNING: fs/nilfs2/btree.c:2340 at nilfs_btree_assign+0xa97/0xcf0 fs/nilfs2/btree.c:2340, CPU#0: syz.0.0/5315
Modules linked in:
CPU: 0 UID: 0 PID: 5315 Comm: syz.0.0 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+0xa97/0xcf0 fs/nilfs2/btree.c:2340
Code: 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 41 2b 0a 08 cc e8 db 83 f0 fd 49 bf 00 00 00 00 00 fc ff df eb 9f e8 ca 83 f0 fd 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:ffffc9000dc8f0e0 EFLAGS: 00010283
RAX: ffffffff83d6b0f6 RBX: ffff88801f435248 RCX: 0000000000100000
RDX: ffffc9000eae2000 RSI: 0000000000004d96 RDI: 0000000000004d97
RBP: ffffc9000dc8f218 R08: ffff88804276f007 R09: 1ffff110084ede00
R10: dffffc0000000000 R11: ffffed10084ede01 R12: 1ffff92001b91e2c
R13: ffffc9000dc8f5a0 R14: 00000000fffffffe R15: 0000000000000001
FS:  00007fb7d40016c0(0000) GS:ffff88808c30a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 0000000012404000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 nilfs_bmap_assign+0x8c/0x160 fs/nilfs2/bmap.c:374
 nilfs_segctor_update_payload_blocknr fs/nilfs2/segment.c:1644 [inline]
 nilfs_segctor_assign fs/nilfs2/segment.c:1678 [inline]
 nilfs_segctor_do_construct+0x3b23/0x7a70 fs/nilfs2/segment.c:2137
 nilfs_segctor_construct+0x170/0x690 fs/nilfs2/segment.c:2466
 nilfs_clean_segments+0x4ec/0xbe0 fs/nilfs2/segment.c:2561
 nilfs_ioctl_clean_segments fs/nilfs2/ioctl.c:938 [inline]
 nilfs_ioctl+0x2619/0x2780 fs/nilfs2/ioctl.c:1368
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb7d319e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb7d4000fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb7d3425fa0 RCX: 00007fb7d319e0d9
RDX: 0000200000000040 RSI: 0000000040786e88 RDI: 0000000000000006
RBP: 00007fb7d3235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb7d3426038 R14: 00007fb7d3425fa0 R15: 00007ffeb0cbd518
 </TASK>