VFS: Busy inodes after unmount of loop7 (nilfs2)
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kernel BUG at fs/super.c:765!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 7872 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 23 ec ff 49 8b 16 48 81 c3 a8 06 00 00 48 c7 c7 a0 b0 1f 8c 48 89 de e8 9a 0c 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:ffffc90003c2fd10 EFLAGS: 00010246
RAX: 0000000000000030 RBX: ffff88811150c6a8 RCX: 65a986f7a26e9300
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 1ffff110222a18f7 R08: ffffc90003c2fa87 R09: 1ffff92000785f50
R10: dffffc0000000000 R11: fffff52000785f51 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8f314be0 R15: ffff88811150c7b8
FS:  0000555583940500(0000) GS:ffff8882a8cd6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555583963a68 CR3: 0000000112ec8000 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: 0033:0x7f1e1919f397
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:00007fff73142bc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f1e19234474 RCX: 00007f1e1919f397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff73142c80
RBP: 00007fff73142c80 R08: 00007fff73143c80 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff73143d70
R13: 00007f1e19234474 R14: 000000000002e356 R15: 00007fff73144e40
 </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 23 ec ff 49 8b 16 48 81 c3 a8 06 00 00 48 c7 c7 a0 b0 1f 8c 48 89 de e8 9a 0c 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:ffffc90003c2fd10 EFLAGS: 00010246
RAX: 0000000000000030 RBX: ffff88811150c6a8 RCX: 65a986f7a26e9300
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 1ffff110222a18f7 R08: ffffc90003c2fa87 R09: 1ffff92000785f50
R10: dffffc0000000000 R11: fffff52000785f51 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8f314be0 R15: ffff88811150c7b8
FS:  0000555583940500(0000) GS:ffff8882a8cd6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6ef51eb840 CR3: 0000000112ec8000 CR4: 00000000000006f0
