BUG: Dentry ffff888070259a70{i=0,n=.reiserfs_priv}  still in use (1) [unmount of squashfs loop3]
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WARNING: CPU: 0 PID: 3637 at fs/dcache.c:1676 umount_check+0x188/0x1d0 fs/dcache.c:1667
Modules linked in:
CPU: 0 PID: 3637 Comm: syz-executor.3 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:umount_check+0x188/0x1d0 fs/dcache.c:1676
Code: ff 4c 8b 0b 48 81 c5 a8 06 00 00 48 c7 c7 e0 20 9d 8a 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 88 ae 34 08 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:ffffc9000433fcc0 EFLAGS: 00010296
RAX: 0000000000000060 RBX: ffffffff8ccf1280 RCX: b33056d1e720f200
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffff88803d8f66a8 R08: ffffffff816aa79d R09: ffffed10173467f1
R10: ffffed10173467f1 R11: 1ffff110173467f0 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000000 R15: ffff888070259a70
FS:  0000555556871400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555687a848 CR3: 0000000037002000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 d_walk+0x1e3/0x6d0 fs/dcache.c:1386
 do_one_tree fs/dcache.c:1683 [inline]
 shrink_dcache_for_umount+0x8a/0x1a0 fs/dcache.c:1699
 generic_shutdown_super+0x63/0x310 fs/super.c:472
 kill_block_super+0x79/0xd0 fs/super.c:1427
 deactivate_locked_super+0xa7/0xf0 fs/super.c:331
 cleanup_mnt+0x4ce/0x560 fs/namespace.c:1186
 task_work_run+0x146/0x1c0 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:169
 exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:294
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f29c568ca17
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 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 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff023889c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f29c568ca17
RDX: 00007fff02388a9c RSI: 000000000000000a RDI: 00007fff02388a90
RBP: 00007fff02388a90 R08: 00000000ffffffff R09: 00007fff02388860
R10: 00005555568728b3 R11: 0000000000000246 R12: 00007f29c56e55f6
R13: 00007fff02389b50 R14: 0000555556872810 R15: 00007fff02389b90
 </TASK>