BUG: Dentry 000000007cc2cd73{i=4,n=file1}  still in use (1) [unmount of tmpfs tmpfs]
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WARNING: CPU: 0 PID: 8482 at fs/dcache.c:1616 umount_check+0x188/0x1d0 fs/dcache.c:1607
Modules linked in:
CPU: 0 PID: 8482 Comm: syz-executor.4 Not tainted 5.10.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:umount_check+0x188/0x1d0 fs/dcache.c:1607
Code: ff 4c 8b 0b 48 81 c5 a8 06 00 00 48 c7 c7 60 1e 9d 89 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 59 a7 95 ff 48 83 c4 08 <0f> 0b e9 f4 fe ff ff 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c cb fe ff
RSP: 0018:ffffc9000196fd08 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffffffff8bb7ffc0 RCX: c93a01cfa6be6300
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffff88802fe8e6a8 R08: ffffffff815d1882 R09: ffffed10173860e8
R10: ffffed10173860e8 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000004 R15: ffff88802dabd780
FS:  0000000001bdf940(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd59870cfc CR3: 000000006ac4b000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 d_walk+0x196/0x700 fs/dcache.c:1326
 do_one_tree fs/dcache.c:1623 [inline]
 shrink_dcache_for_umount+0x8a/0x1c0 fs/dcache.c:1639
 generic_shutdown_super+0x63/0x2a0 fs/super.c:447
 kill_anon_super fs/super.c:1108 [inline]
 kill_litter_super+0x71/0xa0 fs/super.c:1117
 deactivate_locked_super+0xa7/0xf0 fs/super.c:335
 cleanup_mnt+0x462/0x510 fs/namespace.c:1118
 task_work_run+0x137/0x1c0 kernel/task_work.c:151
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:164 [inline]
 exit_to_user_mode_prepare+0xe4/0x170 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x4a/0x170 kernel/entry/common.c:266
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4608e7
Code: 64 89 04 25 d0 02 00 00 58 5f ff d0 48 89 c7 e8 2f be ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd59871408 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000004608e7
RDX: 00000000004031f8 RSI: 0000000000000002 RDI: 00007ffd598714b0
RBP: 0000000000000627 R08: 0000000000000000 R09: 000000000000000b
R10: 0000000000000005 R11: 0000000000000246 R12: 00007ffd59872540
R13: 0000000001be0a60 R14: 0000000000000000 R15: 00007ffd59872540