[MC-135509] Force JVM crash doesn't work with left control, only right

18w30a added support for forcing a JVM crash with Control+F3+C. However, this doesn't appear to actually work; holding left control and pressing F3+C never triggers the countdown, and pressing control after the countdown starts just causes a regular crash.

Curiously, right control works, for unknown reasons; the code uses GuiScreen.isCtrlKeyDown which checks both left and right. It's not related to keybindings, as it happens even if sprint is rebound to another key.

Environment

Windows, laptop with keyboard with both left and right controls and FN (but FN is not needed to use F3 or similar)

Linked issues

relates to 1

MC-135510 Force JVM crash fails to crash the JVM when LWJGL is in debug mode, instead merely crashing the game Resolved

Comments 3

migrated 2018-08-09T11:55:01Z

The Crtl-F3-C key combination doesn't work on all keyboards. This seems to be a keyboard limitation, and not a Minecraft bug. Try checking if you're able to press all three keys at the same time using this tool: http://keyboardchecker.com/. I'm not.

pokechu22 2018-08-09T16:52:12Z

Aha, yeah, that's it!

In my case, Ctrl+F3+C does not trigger, nor does D/E/3 (which are all above it if the keyboard weren't slanted). The rest of the keys all do. And right-control just doesn't have that limitation.

pokechu22 2018-08-09T18:29:37Z

Yeah, thinking about it this is invalid since it is a keyboard issue (the only workaround they could do would be to change the keys, but that's also awkward and could have problems too; and that'd be a feature request mostly).