BUG: Dentry 00000000d2a3d54e{i=4,n=file1} still in use (1) [unmount of tmpfs tmpfs] ------------[ cut here ]------------ WARNING: CPU: 0 PID: 8522 at fs/dcache.c:1616 umount_check fs/dcache.c:1607 [inline] WARNING: CPU: 0 PID: 8522 at fs/dcache.c:1616 umount_check.cold+0xe6/0x10a fs/dcache.c:1597 Modules linked in: CPU: 0 PID: 8522 Comm: syz-executor.0 Not tainted 5.10.0-rc3-next-20201113-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:umount_check fs/dcache.c:1616 [inline] RIP: 0010:umount_check.cold+0xe6/0x10a fs/dcache.c:1597 Code: b2 90 01 f9 4c 8b 7b 40 e8 19 2e bf f8 4d 89 f1 45 89 e0 48 89 e9 41 55 4c 89 fa 48 89 ee 48 c7 c7 c0 18 58 89 e8 e1 02 ff ff <0f> 0b 58 e9 f3 40 12 f9 e8 7f 90 01 f9 e9 2e ff ff ff 48 89 df e8 RSP: 0018:ffffc9000168fce8 EFLAGS: 00010282 RAX: 0000000000000054 RBX: ffff8880831db3c0 RCX: 0000000000000000 RDX: ffff88801a42cf80 RSI: ffffffff81594365 RDI: fffff520002d1f8f RBP: ffff88802e1df8f8 R08: 0000000000000054 R09: ffff8880b9e30967 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff8880704106a8 R14: ffffffff8954a320 R15: 0000000000000004 FS: 00000000018fc940(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcf5dc8c7c CR3: 00000000597f1000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: d_walk+0x228/0x870 fs/dcache.c:1326 do_one_tree fs/dcache.c:1623 [inline] shrink_dcache_for_umount+0x87/0x330 fs/dcache.c:1639 generic_shutdown_super+0x68/0x370 fs/super.c:447 kill_anon_super fs/super.c:1108 [inline] kill_litter_super+0x6e/0xa0 fs/super.c:1117 deactivate_locked_super+0x94/0x160 fs/super.c:335 deactivate_super+0xad/0xd0 fs/super.c:366 cleanup_mnt+0x3a3/0x530 fs/namespace.c:1123 task_work_run+0xdd/0x190 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x1f0/0x200 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:274 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:00007ffcf5dc9388 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000074a4a RCX: 00000000004608e7 RDX: 00000000004031f8 RSI: 0000000000000002 RDI: 00007ffcf5dc9430 RBP: 0000000000000309 R08: 0000000000000000 R09: 000000000000000b R10: 0000000000000005 R11: 0000000000000246 R12: 00007ffcf5dca4c0 R13: 00000000018fda60 R14: 0000000000000000 R15: 00007ffcf5dca4c0