NILFS (loop2): invalid segment: Checksum error in segment payload
NILFS (loop2): trying rollback from an earlier position
NILFS (loop2): recovery complete
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 1 UID: 0 PID: 12867 Comm: syz.2.2758 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:nilfs_mdt_save_to_shadow_map+0x141/0x1c0
Code: 3f 4c 8d 63 d8 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 de 80 6b fe 4d 8b 24 24 49 83 c4 30 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 c0 80 6b fe 49 8b 34 24 4c 89 ff
RSP: 0018:ffffc90004eef708 EFLAGS: 00010206
RAX: 0000000000000006 RBX: ffff8881b0c84670 RCX: 0000000000000002
RDX: ffff88801ca2d880 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88801ca2d880 R09: 0000000000000003
R10: 0000000000000406 R11: 0000000000000002 R12: 0000000000000030
R13: dffffc0000000000 R14: ffff88817593f140 R15: ffff8881b0c81650
FS:  00007f42556c26c0(0000) GS:ffff8882a9452000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562707e023d8 CR3: 000000001c9fc000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 nilfs_clean_segments+0x160/0xa50
 nilfs_ioctl+0x2619/0x2780
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x170/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f425479e019
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:00007f42556c2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4254a25fa0 RCX: 00007f425479e019
RDX: 0000200000000640 RSI: 0000000040786e88 RDI: 0000000000000004
RBP: 00007f425483500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4254a26038 R14: 00007f4254a25fa0 R15: 00007ffd642e0358
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:nilfs_mdt_save_to_shadow_map+0x141/0x1c0
Code: 3f 4c 8d 63 d8 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 de 80 6b fe 4d 8b 24 24 49 83 c4 30 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 c0 80 6b fe 49 8b 34 24 4c 89 ff
RSP: 0018:ffffc90004eef708 EFLAGS: 00010206
RAX: 0000000000000006 RBX: ffff8881b0c84670 RCX: 0000000000000002
RDX: ffff88801ca2d880 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88801ca2d880 R09: 0000000000000003
R10: 0000000000000406 R11: 0000000000000002 R12: 0000000000000030
R13: dffffc0000000000 R14: ffff88817593f140 R15: ffff8881b0c81650
FS:  00007f42556c26c0(0000) GS:ffff8882a9452000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557327ceb000 CR3: 000000001c9fc000 CR4: 00000000000006f0
