BUG: Dentry ffff888187e6bdd0{i=0,n=.index} still in use (1) [unmount of overlay overlay] ------------[ cut here ]------------ WARNING: CPU: 1 PID: 1507 at fs/dcache.c:1597 umount_check+0x179/0x1c0 fs/dcache.c:1588 Modules linked in: CPU: 1 PID: 1507 Comm: syz-executor.1 Not tainted 5.4.115-syzkaller-00417-ga50424773496 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:umount_check+0x179/0x1c0 fs/dcache.c:1588 Code: ff 4c 8b 0b 48 81 c5 20 04 00 00 48 c7 c7 a0 f5 e8 84 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 67 e3 af ff 48 83 c4 08 <0f> 0b e9 fd fe ff ff 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c d4 fe ff RSP: 0018:ffff8881a8077c68 EFLAGS: 00010282 RAX: 0000000000000059 RBX: ffffffff85fdede0 RCX: 133ede9ac53ac900 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffff8881aea40420 R08: ffffffff814e8767 R09: ffffed103ede5e08 R10: ffffed103ede5e08 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000000 R15: ffff888187e6bdd0 FS: 0000000002c00400(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002c09b38 CR3: 00000001a806e000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: d_walk+0x2d9/0x540 fs/dcache.c:1307 do_one_tree fs/dcache.c:1604 [inline] shrink_dcache_for_umount+0x8a/0x1a0 fs/dcache.c:1620 generic_shutdown_super+0x63/0x2a0 fs/super.c:447 kill_anon_super+0x36/0x60 fs/super.c:1108 deactivate_locked_super+0xaf/0x100 fs/super.c:335 deactivate_super+0x1b3/0x270 fs/super.c:366 cleanup_mnt+0x432/0x4e0 fs/namespace.c:1102 task_work_run+0x186/0x1b0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:163 [inline] prepare_exit_to_usermode+0x2b0/0x310 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x467a57 Code: ff d0 48 89 c7 b8 3c 00 00 00 0f 05 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffce9524188 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000467a57 RDX: 00007ffce952425d RSI: 0000000000000002 RDI: 00007ffce9524250 RBP: 00007ffce9524250 R08: 00000000ffffffff R09: 00007ffce9524020 R10: 0000000002c01bd3 R11: 0000000000000202 R12: 00000000004bee98 R13: 00007ffce9525320 R14: 0000000002c01b00 R15: 00007ffce9525360 ---[ end trace 6bbe94761fb7441d ]--- VFS: Busy inodes after unmount of overlay. Self-destruct in 5 seconds. Have a nice day...