Hi there guys.
My name's Aldi and I want to report a bug I discovered accidentally on my Manjaro Deepin & Arch Linux installation.

The bug I discovered is that when I lock my Manjaro Deepin / Arch Linux user account (of course I have already logged in) and I try to get access back in by entering my correct password, here is what I did and it resulted in User Account Lock Bypass.

The steps to reproduce the bug I found are as follows:

Lock your user (after you've logged in of course).
Press the ENTER button a bunch of times with an empty password field
After the Step 2 Manjaro Deepin will try to show you the "Wrong Password!", you just have to do some more tries of a wrong password (take for example 123).
Then after you have followed steps 2 and 3 all you have to do now is to click somewhere on the screen for a bit of time (just make a bunch of clicks here and there on the screen).
I could not believe my eyes when I was just playing with my lock screen, that after I attempted a bunch of wrong password entries and randomly clicking 'fast' on the lock screen the Lock protection dissapeared and Desktop shown up.

**Note that while waiting for the community to issue a fix on the bug, another Arch Linux user reported that he could reproduce the same bug on his latest up-to-date (15-05-2017) Arch Linux installation and that he was able to bypass User Account Lock mechanism.
He also provided a dmesg output for me to show that indeed was the same function (QDBusConnection) crashing and thus bypassing the lock mechanism.

dmesg output:
[11383.806000] QDBusConnection[18458]: segfault at 185f160 ip 000000000185f160 sp 00007fa4f61ed9b8 error 15
[11412.909334] QDBusConnection[18469]: segfault at 18ded50 ip 00000000018ded50 sp 00007f77a182d9b8 error 15

PS: Please be patient when clicking on the screen, all you have to do is to click many times for a bit long (approx. 30 sec's) amount of time.

- Credits worth giving to anderberin for the reproduction of the bug on the standard Arch Linux distro.
- The link to my original issue on https://github.com/linuxdeepin/developer-center/issues/286

Thank you for your time.

Best Regards,
Aldi!