VFS: Busy inodes after unmount of loop0 (nilfs2)
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kernel BUG at fs/super.c:733!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 5656 Comm: syz-executor326 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
RIP: 0010:generic_shutdown_super+0x2ca/0x2d0 fs/super.c:731
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 70 c3 eb ff 49 8b 16 48 81 c3 c0 06 00 00 48 c7 c7 e0 4d 40 8c 48 89 de e8 67 08 d2 fe 90 <0f> 0b 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003bd7c50 EFLAGS: 00010246
RAX: 0000000000000030 RBX: ffff88807e85e6c0 RCX: 07763b9482d99d00
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 1ffff1100fd0bcfa R08: ffffc90003bd79c7 R09: 1ffff9200077af38
R10: dffffc0000000000 R11: fffff5200077af39 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff90728ae0 R15: ffff88807e85e7d0
FS:  000055557e374400(0000) GS:ffff8881233f9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557e37d7b8 CR3: 00000000736ca000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kill_block_super+0x44/0xa0 fs/super.c:1852
 deactivate_locked_super+0xbe/0x110 fs/super.c:558
 cleanup_mnt+0x204/0x2a0 fs/namespace.c:1396
 task_work_run+0x1d9/0x260 kernel/task_work.c:233
 ptrace_notify+0x258/0x290 kernel/signal.c:2598
 ptrace_report_syscall include/linux/ptrace.h:416 [inline]
 ptrace_report_syscall_exit+0x2d/0x50 include/linux/ptrace.h:477
 arch_ptrace_report_syscall_exit include/linux/entry-common.h:240 [inline]
 syscall_exit_work include/linux/entry-common.h:273 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:304 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:341 [inline]
 do_syscall_64+0x4ba/0x530 arch/x86/entry/syscall_64.c:107
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x00007f3a7a6331b7
Code: bf 41 4d 56 53 b8 9d 00 00 00 0f 05 83 f8 ea 75 a2 c7 05 d4 18 09 00 00 00 00 00 eb 96 e8 81 05 00 00 90 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 d8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffebd02de58 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000064 RCX: 00007f3a7a6331b7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffebd02df10
RBP: 00007ffebd02df10 R08: 00007ffebd02ef10 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffebd02ef80
R13: 000055557e375780 R14: 431bde82d7b634db R15: 00007ffebd02efa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:generic_shutdown_super+0x2ca/0x2d0 fs/super.c:731
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 70 c3 eb ff 49 8b 16 48 81 c3 c0 06 00 00 48 c7 c7 e0 4d 40 8c 48 89 de e8 67 08 d2 fe 90 <0f> 0b 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003bd7c50 EFLAGS: 00010246
RAX: 0000000000000030 RBX: ffff88807e85e6c0 RCX: 07763b9482d99d00
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 1ffff1100fd0bcfa R08: ffffc90003bd79c7 R09: 1ffff9200077af38
R10: dffffc0000000000 R11: fffff5200077af39 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff90728ae0 R15: ffff88807e85e7d0
FS:  000055557e374400(0000) GS:ffff8881233f9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557e37d7b8 CR3: 00000000736ca000 CR4: 00000000003526f0