NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer
VFS: Busy inodes after unmount of loop4 (nilfs2)
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kernel BUG at fs/super.c:733!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 5634 Comm: syz-executor 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 00 d5 eb ff 49 8b 16 48 81 c3 c0 06 00 00 48 c7 c7 60 3d 40 8c 48 89 de e8 67 a7 d3 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:ffffc90003e57d10 EFLAGS: 00010246
RAX: 0000000000000030 RBX: ffff88807cec26c0 RCX: bfcdd6df5947dc00
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 1ffff1100f9d84fa R08: ffffc90003e57a87 R09: 1ffff920007caf50
R10: dffffc0000000000 R11: fffff520007caf51 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff90728360 R15: ffff88807cec27d0
FS:  000055558935e500(0000) GS:ffff888123511000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3471eff8 CR3: 0000000057e7a000 CR4: 0000000000350ef0
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
 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: 0033:0x7f1348ba0d57
Code: a2 c7 05 9c a9 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:00007ffe320ec478 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f1348c36fb3 RCX: 00007f1348ba0d57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe320ec530
RBP: 00007ffe320ec530 R08: 00007ffe320ed530 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe320ed5c0
R13: 00007f1348c36fb3 R14: 00000000000798a5 R15: 00007ffe320ed600
 </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 00 d5 eb ff 49 8b 16 48 81 c3 c0 06 00 00 48 c7 c7 60 3d 40 8c 48 89 de e8 67 a7 d3 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:ffffc90003e57d10 EFLAGS: 00010246
RAX: 0000000000000030 RBX: ffff88807cec26c0 RCX: bfcdd6df5947dc00
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 1ffff1100f9d84fa R08: ffffc90003e57a87 R09: 1ffff920007caf50
R10: dffffc0000000000 R11: fffff520007caf51 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff90728360 R15: ffff88807cec27d0
FS:  000055558935e500(0000) GS:ffff888123411000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb075344000 CR3: 0000000057e7a000 CR4: 0000000000350ef0