VFS: Busy inodes after unmount of loop4 (nilfs2)
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kernel BUG at fs/super.c:759!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5615 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:generic_shutdown_super.cold+0x59/0x62 fs/super.c:759
Code: 48 c1 ea 03 80 3c 02 00 74 08 48 89 ef e8 95 a1 59 01 48 8b 55 00 48 8d b3 a8 06 00 00 48 c7 c7 e0 f5 06 8c e8 7e 52 fd ff 90 <0f> 0b e8 76 a1 59 01 eb bd e8 df 2e e7 00 48 c7 c7 80 fe 06 8c e8
RSP: 0018:ffffc900041e7d50 EFLAGS: 00010286
RAX: 0000000000000030 RBX: ffff8880135aa000 RCX: 0000000000000000
RDX: 0000000000000030 RSI: ffffffff81ea1779 RDI: fffff5200083cf9b
RBP: ffffffff8f608d40 R08: 0000000000000007 R09: 0000000000000000
R10: 8000000000000000 R11: 0000000000000001 R12: ffff8880135aaa00
R13: ffff8880135aa7b8 R14: 0000000000000000 R15: ffff888074178900
FS:  0000555585d44500(0000) GS:ffff888123b4c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f93e6426000 CR3: 00000000595ad000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 kill_block_super+0x3b/0xa0 fs/super.c:1903
 deactivate_locked_super+0xbd/0x130 fs/super.c:586
 deactivate_super fs/super.c:614 [inline]
 deactivate_super+0xea/0x110 fs/super.c:610
 cleanup_mnt+0x21f/0x450 fs/namespace.c:1317
 task_work_run+0x150/0x240 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+0x1d8/0x700 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+0x661/0x790 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2c1f9f397
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:00007ffc84c2d058 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fe2c20344bb RCX: 00007fe2c1f9f397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc84c2d110
RBP: 00007ffc84c2d110 R08: 00007ffc84c2e110 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc84c2e1a0
R13: 00007fe2c20344bb R14: 0000000000018c98 R15: 00007ffc84c2e1e0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:generic_shutdown_super.cold+0x59/0x62 fs/super.c:759
Code: 48 c1 ea 03 80 3c 02 00 74 08 48 89 ef e8 95 a1 59 01 48 8b 55 00 48 8d b3 a8 06 00 00 48 c7 c7 e0 f5 06 8c e8 7e 52 fd ff 90 <0f> 0b e8 76 a1 59 01 eb bd e8 df 2e e7 00 48 c7 c7 80 fe 06 8c e8
RSP: 0018:ffffc900041e7d50 EFLAGS: 00010286
RAX: 0000000000000030 RBX: ffff8880135aa000 RCX: 0000000000000000
RDX: 0000000000000030 RSI: ffffffff81ea1779 RDI: fffff5200083cf9b
RBP: ffffffff8f608d40 R08: 0000000000000007 R09: 0000000000000000
R10: 8000000000000000 R11: 0000000000000001 R12: ffff8880135aaa00
R13: ffff8880135aa7b8 R14: 0000000000000000 R15: ffff888074178900
FS:  0000555585d44500(0000) GS:ffff888123c4c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f93f004df5a CR3: 00000000595ad000 CR4: 0000000000350ef0