VFS: Busy inodes after unmount of loop4 (iso9660)
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kernel BUG at fs/super.c:652!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 5863 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:generic_shutdown_super+0x2bc/0x2c0 fs/super.c:650
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 7e 7f ee ff 49 8b 16 48 81 c3 68 06 00 00 48 c7 c7 c0 4c b9 8b 48 89 de e8 15 29 f0 fe 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f
RSP: 0018:ffffc900041afd20 EFLAGS: 00010246
RAX: 0000000000000031 RBX: ffff88807b2fa668 RCX: ba60345fd3c47900
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff1100f65f4f0 R08: ffffc900041afa47 R09: 1ffff92000835f48
R10: dffffc0000000000 R11: fffff52000835f49 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8e558e20 R15: ffff88807b2fa780
FS:  000055558839d500(0000) GS:ffff888125afc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3972c5 CR3: 0000000077dc6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kill_block_super+0x44/0x90 fs/super.c:1722
 deactivate_locked_super+0xbc/0x130 fs/super.c:473
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1327
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1979b901f7
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 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 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffd7134b138 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f1979c11d7d RCX: 00007f1979b901f7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd7134b1f0
RBP: 00007ffd7134b1f0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd7134c280
R13: 00007f1979c11d7d R14: 000000000004b162 R15: 00007ffd7134c2c0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:generic_shutdown_super+0x2bc/0x2c0 fs/super.c:650
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 7e 7f ee ff 49 8b 16 48 81 c3 68 06 00 00 48 c7 c7 c0 4c b9 8b 48 89 de e8 15 29 f0 fe 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f
RSP: 0018:ffffc900041afd20 EFLAGS: 00010246
RAX: 0000000000000031 RBX: ffff88807b2fa668 RCX: ba60345fd3c47900
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff1100f65f4f0 R08: ffffc900041afa47 R09: 1ffff92000835f48
R10: dffffc0000000000 R11: fffff52000835f49 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8e558e20 R15: ffff88807b2fa780
FS:  000055558839d500(0000) GS:ffff8881259fc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000002b0 CR3: 0000000077dc6000 CR4: 00000000003526f0