Info
System: Windows 10 - 64bit
Studio Version: Version 0.614.0.6140412 (64bit)
Description
The client crashes, but not only the client, other players can crash as well. This is caused by strange things that I am not really sure about, I just have the steps that lead to the crash very very often.
Happens on both Client and Studio, it’s Engine related.
I encountered this issue first in a game, but it doesn’t matter. I’ve extracted everything I needed from that game to crash the game.
It involves strange Network Ownership behavior, Humanoid Animation going weird, Character Apperance modification and Layered Clothing.
I made a video, it explains everything.
Expected Result
No crash.
Actual Result
It crashes.
Sidenotes, while I was recording I managed to error out the new ui idk
if you want the videos of that on where it happens, lemme know
All the log/dump files, reproduction steps/place file, videos can be found here:
https://devforum.roblox.com/t/crash-files-for-the-bug-report/2874075
2 Likes
When your roblox client crashes, is the crash related to a Nullpointerexception?
If so please let me know, because I have made a game, which doesn’t crash at a low playercount rate, but at a playercount of 50 a few players crash infrequently, including me.
I decrypted the dmp file and found out that the crash was related to a Nullpointerexception, and I really want to make sure that it is not because of a memory leak (I already checked every single line of code and could not find a single one).
One of the crash dumps talks about a thread.
0xc0000005
The thread tried to read from or write to a virtual address for which it does not have the appropriate access.
That wasn’t the only exception type that I found.
The .dmp file alone is useless without the .pdb. There’s some info inside of it though, but idk what to do with it. One of them had LeftFoot.LeftFoot but there’s no LeftFoot under a LeftFoot on a regular R15, so it made no sense.
The screenshot that somehow remained left over in this report, is a totally different issue.
I can generate a crash file for this issue within seconds and setup an entire crash analytics farm, with me just alone on a server, Studio or Client. This crash issue that I am after, might be related to crashes I’ve encountered once but never knew what it was, also other players can crash as well due to it, so it’s not entirely client-side.
And I really wanna know the cause of this crash.
Decrypt how?
There is a program in the Microsoft store called “WinDbg”, which somehow manages to analyze dmp files and makes them readable, though it only shows windows related exceptions rather than why the crash got triggered. It’s very hard determining what is causing the crash and this is very annoying.
I also had the error “0xc0000005” but the cause for the error was “NULL_CLASS_PTR_READ_AVRF” which usually means that there was a Nullpointerexception.
Hopefully any stuff member will adress you with the issue
I put the .dmp files in Visual Studio 
OH LOL why didn’t I think about that. Anyways, the issue now also occurs inside roblox studio for me, but now very frequently.
What is your cause?
My cause involves… well, I used something from a different game where I encountered the issue and constructed it together.
It involves Client and Server side difference with physics and assemblies. Then it involves Anchoring the HumanoidRootPart, which changes the NetworkOwnership obviously, and then in involved changing the HumanoidDescription.
Between this weirdness there’s another step. A step that works only because the assembly is different in client and server side stuff. It freezes the player and freezes the player’s animation in a weird way. Once you have “destroyed” the Character’s Animation, the crash can occur.
Thanks for the report! We’ll investigate.
Its hard to determine, but I found out the crash used to happen because of the bulletholes not disappearing, but the crash in the screenshot happened before shooting any wheapon. It looks like a physics replication bug to me
Please, let me know the cause if it gets figured out. I am very interested
I’d like to mention that another type of crash this causes is this one
I can reproduce this on iOS as well, reproduction steps are the same.
In the Crash Testing game, I’ve added a button to semi-automate the process to crash the game. It causes the crashes way better, by automizing the reproduction steps that I mentioned. Which can also make this “Internet Connection” issue occur, that I managed to get on iOS without any automatization.
I am not sure that this means that a server crashed.
Edit:
I can confirm that this is a server side crash, which whenever it happens for this bug, can also cause client crashes to other clients. So this issue doesn’t cause only client crashes, it can make the server itself crash as well.
And these kind of issues do happen sometimes in a few games, but it just says that the internet server disconnected, making this bug something way more interesting.
You can also get both, one is server crash and a client crash after trying to reconnect.
1 Like
I was randomly testing something and noticed two things.
On iOS I have .ips files
https://devforum.roblox.com/t/ios-crash-after-exiting-a-game-and-being-request-local-network-permissions-sigsegv-kerninvalidaddress/3183262
It crashed after I gave it Local Network permissions, it didn’t crash before. This is something that happens in Roblox Studio as well. There is a case where you don’t crash mid-game, but only after Stopping the game.
Then there’s a crash log for when I left the game, with local network permissions being already granted.
And then there’s a crash log for when I crashed mid-game. Not sure if the crashes for leaving the game are related.
