VFS: Busy inodes after unmount of loop2 (nilfs2)
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kernel BUG at fs/super.c:761!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 5608 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:generic_shutdown_super+0x2c7/0x2d0 fs/super.c:759
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 73 d0 eb ff 49 8b 16 48 81 c3 a8 06 00 00 48 c7 c7 60 fa 1f 8c 48 89 de e8 1a 4b d9 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:ffffc90003f2fd10 EFLAGS: 00010246
RAX: 0000000000000030 RBX: ffff88805433c6a8 RCX: d6b8d7dad6a77b00
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 1ffff1100a8678f7 R08: ffffc90003f2fa87 R09: 1ffff920007e5f50
R10: dffffc0000000000 R11: fffff520007e5f51 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8f316fe0 R15: ffff88805433c7b8
FS:  000055557ca15500(0000) GS:ffff888124cc4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fed94b0de9c CR3: 0000000071728000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kill_block_super+0x44/0xa0 fs/super.c:1914
 deactivate_locked_super+0xbe/0x110 fs/super.c:586
 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1329
 task_work_run+0x1d9/0x260 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:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f047d39f397
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:00007ffe2b815568 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f047d4344bb RCX: 00007f047d39f397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe2b815620
RBP: 00007ffe2b815620 R08: 00007ffe2b816620 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe2b8166b0
R13: 00007f047d4344bb R14: 0000000000042bc3 R15: 00007ffe2b8166f0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:generic_shutdown_super+0x2c7/0x2d0 fs/super.c:759
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 73 d0 eb ff 49 8b 16 48 81 c3 a8 06 00 00 48 c7 c7 60 fa 1f 8c 48 89 de e8 1a 4b d9 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:ffffc90003f2fd10 EFLAGS: 00010246
RAX: 0000000000000030 RBX: ffff88805433c6a8 RCX: d6b8d7dad6a77b00
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 1ffff1100a8678f7 R08: ffffc90003f2fa87 R09: 1ffff920007e5f50
R10: dffffc0000000000 R11: fffff520007e5f51 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8f316fe0 R15: ffff88805433c7b8
FS:  000055557ca15500(0000) GS:ffff888124cc4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f47819e4a10 CR3: 0000000071728000 CR4: 00000000003526f0