VFS: Busy inodes after unmount of loop4 (nilfs2)
------------[ cut here ]------------
kernel BUG at fs/super.c:779!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 11959 Comm: syz-executor 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:generic_shutdown_super+0x2c7/0x2d0
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 e3 a3 ec ff 49 8b 16 48 81 c3 a8 06 00 00 48 c7 c7 a0 88 fe 8b 48 89 de e8 1a a1 df fe 90 <0f> 0b 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90009bd7d10 EFLAGS: 00010246
RAX: 0000000000000030 RBX: ffff888110f9e6a8 RCX: 0ab82cfc460e4400
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 1ffff110221f3cf7 R08: ffffc90009bd7a87 R09: 1ffff9200137af50
R10: dffffc0000000000 R11: fffff5200137af51 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8f101560 R15: ffff888110f9e7b8
FS:  0000555564879500(0000) GS:ffff8882a8f39000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2df20ff8 CR3: 00000001b4276000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 kill_block_super+0x44/0xa0
 deactivate_locked_super+0xbc/0x110
 cleanup_mnt+0x3d3/0x460
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x204/0x770
 do_syscall_64+0x328/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff4d179f397
Code: a2 c7 05 5c 43 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc9a9c68a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007ff4d18344bb RCX: 00007ff4d179f397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc9a9c6960
RBP: 00007ffc9a9c6960 R08: 00007ffc9a9c7960 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc9a9c79f0
R13: 00007ff4d18344bb R14: 0000000000052bad R15: 00007ffc9a9c7a30
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:generic_shutdown_super+0x2c7/0x2d0
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 e3 a3 ec ff 49 8b 16 48 81 c3 a8 06 00 00 48 c7 c7 a0 88 fe 8b 48 89 de e8 1a a1 df fe 90 <0f> 0b 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90009bd7d10 EFLAGS: 00010246
RAX: 0000000000000030 RBX: ffff888110f9e6a8 RCX: 0ab82cfc460e4400
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 1ffff110221f3cf7 R08: ffffc90009bd7a87 R09: 1ffff9200137af50
R10: dffffc0000000000 R11: fffff5200137af51 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8f101560 R15: ffff888110f9e7b8
FS:  0000555564879500(0000) GS:ffff8882a8f39000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2df1eff8 CR3: 00000001b4276000 CR4: 00000000000006f0
