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:2302 at nilfs_btree_assign+0xa84/0xce0 fs/nilfs2/btree.c:2302, CPU#0: syz.0.0/5331
Modules linked in:
CPU: 0 UID: 0 PID: 5331 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+0xa84/0xce0 fs/nilfs2/btree.c:2302
Code: 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 14 ae fa 07 cc e8 fe 09 14 fe 49 bf 00 00 00 00 00 fc ff df eb 9f e8 ed 09 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:ffffc9000510f0c0 EFLAGS: 00010287
RAX: ffffffff83b1bd23 RBX: ffff888045fb5248 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 00000000000028d1 RDI: 00000000000028d2
RBP: ffffc9000510f1f0 R08: ffff88801ccbdcb7 R09: 1ffff11003997b96
R10: dffffc0000000000 R11: ffffed1003997b97 R12: 1ffff92000a21e28
R13: ffffc9000510f580 R14: 00000000fffffffe R15: 0000000000000001
FS:  00007fcf2ccfb6c0(0000) GS:ffff88808c894000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcf20bff000 CR3: 00000000432b4000 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_clean_segments+0x3bd/0xa50 fs/nilfs2/segment.c:2536
 nilfs_ioctl_clean_segments fs/nilfs2/ioctl.c:922 [inline]
 nilfs_ioctl+0x261f/0x2780 fs/nilfs2/ioctl.c:1352
 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:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf2bd9ce59
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:00007fcf2ccfafe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fcf2c015fa0 RCX: 00007fcf2bd9ce59
RDX: 0000200000000040 RSI: 0000000040786e88 RDI: 000000000000000d
RBP: 00007fcf2be32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcf2c016038 R14: 00007fcf2c015fa0 R15: 00007fff2aab5878
 </TASK>