NILFS (loop0): disposed unprocessed dirty file(s) when detaching log writer
VFS: Busy inodes after unmount of loop0 (nilfs2)
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kernel BUG at fs/super.c:779!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5323 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:generic_shutdown_super+0x2c7/0x2d0 fs/super.c:777
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 43 1c ec ff 49 8b 16 48 81 c3 a8 06 00 00 48 c7 c7 20 b8 1f 8c 48 89 de e8 0a 9a da 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:ffffc9000f067d10 EFLAGS: 00010246
RAX: 0000000000000030 RBX: ffff8880120e26a8 RCX: 1604d113d2b10600
RDX: ffffc90020001000 RSI: 000000000000686d RDI: 000000000000686e
RBP: 1ffff1100241c4f7 R08: ffffc9000f067a67 R09: 1ffff92001e0cf4c
R10: dffffc0000000000 R11: fffff52001e0cf4d R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8f316760 R15: ffff8880120e27b8
FS:  00007fb8bfc1c6c0(0000) GS:ffff88808c2cd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb8b2c3f000 CR3: 000000001271e000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 kill_block_super+0x44/0xa0 fs/super.c:1918
 deactivate_locked_super+0xbc/0x110 fs/super.c:603
 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb8bed9e159
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:00007fb8bfc1bfe8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fb8bf026090 RCX: 00007fb8bed9e159
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000
RBP: 00007fb8bee35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb8bf026128 R14: 00007fb8bf026090 R15: 00007ffdca0ad138
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:generic_shutdown_super+0x2c7/0x2d0 fs/super.c:777
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 43 1c ec ff 49 8b 16 48 81 c3 a8 06 00 00 48 c7 c7 20 b8 1f 8c 48 89 de e8 0a 9a da 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:ffffc9000f067d10 EFLAGS: 00010246
RAX: 0000000000000030 RBX: ffff8880120e26a8 RCX: 1604d113d2b10600
RDX: ffffc90020001000 RSI: 000000000000686d RDI: 000000000000686e
RBP: 1ffff1100241c4f7 R08: ffffc9000f067a67 R09: 1ffff92001e0cf4c
R10: dffffc0000000000 R11: fffff52001e0cf4d R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8f316760 R15: ffff8880120e27b8
FS:  00007fb8bfc1c6c0(0000) GS:ffff88808c2cd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb8b2c3f000 CR3: 000000001271e000 CR4: 0000000000352ef0