VFS: Busy inodes after unmount of loop8 (nilfs2)
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kernel BUG at fs/super.c:779!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 7939 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 c3 35 ec ff 49 8b 16 48 81 c3 a8 06 00 00 48 c7 c7 80 a0 1f 8c 48 89 de e8 fa 94 dc 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:ffffc900034cfd10 EFLAGS: 00010246
RAX: 0000000000000030 RBX: ffff8881ad09a6a8 RCX: faef3abc08da7f00
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 1ffff11035a134f7 R08: ffffc900034cfa87 R09: 1ffff92000699f50
R10: dffffc0000000000 R11: fffff52000699f51 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8f311880 R15: ffff8881ad09a7b8
FS:  0000555561f6c500(0000) GS:ffff8882a8ce4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb450bde510 CR3: 000000011613e000 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: 0033:0x7f1ebc99f397
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:00007fffb48a9a18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f1ebca344bb RCX: 00007f1ebc99f397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffb48a9ad0
RBP: 00007fffb48a9ad0 R08: 00007fffb48aaad0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffb48aab60
R13: 00007f1ebca344bb R14: 0000000000040c7c R15: 00007fffb48aaba0
 </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 c3 35 ec ff 49 8b 16 48 81 c3 a8 06 00 00 48 c7 c7 80 a0 1f 8c 48 89 de e8 fa 94 dc 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:ffffc900034cfd10 EFLAGS: 00010246
RAX: 0000000000000030 RBX: ffff8881ad09a6a8 RCX: faef3abc08da7f00
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 1ffff11035a134f7 R08: ffffc900034cfa87 R09: 1ffff92000699f50
R10: dffffc0000000000 R11: fffff52000699f51 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8f311880 R15: ffff8881ad09a7b8
FS:  0000555561f6c500(0000) GS:ffff8882a8ce4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb455b57e20 CR3: 000000011613e000 CR4: 00000000000006f0
