Crash Reporting for Games With Anti-Cheat Enabled

Anti-cheat is a deal with a strange partner. To stop cheaters it installs deep, often a kernel-mode driver, and it watches your process for the kinds of memory edits and code injection that crash reporters and cheats look superficially alike. That overlap is the problem. The same hooks that catch a cheater can swallow a legitimate crash, block a handler from writing a dump, or flag your own diagnostics as suspicious. Meanwhile a driver bug on the player's machine can crash your game in a way that has nothing to do with your code. If you ship multiplayer with anti-cheat, your crash data is only useful once you account for the system sitting between you and the OS.

Why anti-cheat distorts your crash data

A crash handler works by sitting at the lowest level it can reach, catching a fault, and recording the process state before it dies. Anti-cheat wants that same low level for the opposite reason, to be the authority on what touches your process. When both want the bottom of the stack, the anti-cheat usually wins, because it loaded first and runs in the kernel. The result is that your handler may run after the anti-cheat has already intervened, or not run at all, so the dump you get is incomplete or describes the anti-cheat tearing the process down rather than the original fault.

There is also a trust problem. Anti-cheat treats memory inspection, thread enumeration, and stack walking with suspicion, which is exactly what a crash reporter does to build a report. On a strict configuration the act of capturing a crash can itself trip a protection and either fail silently or, worse, look like tampering. So your reports can be missing, truncated, or skewed toward the moments where the two systems collide. Until you know which crashes are real faults and which are artifacts of the anti-cheat interaction, the pile is untrustworthy.

Kernel drivers and the crashes they cause

The heaviest anti-cheat solutions ship a kernel driver, and kernel drivers crash the whole machine, not just your game. A bad interaction between the anti-cheat driver and a player's GPU driver, overlay, or security software can produce blue screens and hard hangs that get blamed on your game because your game is what was on screen. These show up in your support queue as unreproducible crashes that correlate with no code path you can find, because the fault is one layer below your code entirely, in a driver you did not write and cannot patch.

You cannot fix the anti-cheat driver, but you can identify its fingerprint. Crashes that cluster on a particular anti-cheat version, that appear only alongside a specific overlay or antivirus, or that present as process termination rather than an in-process exception are strong candidates for driver-level interaction. Capturing the anti-cheat product and version lets you correlate against the vendor's known issues and their update cadence. Often the resolution is waiting for or prompting an anti-cheat update, but you can only make that call when your data clearly separates these from genuine bugs in your own logic.

False positives in both directions

Anti-cheat produces false positives that masquerade as crashes. A legitimate player on unusual hardware, a virtual machine, or with an aggressive overlay can get their session forcibly terminated by the protection, which the player experiences as a crash and reports as one. From your side it looks like the game died, but the cause is a detection heuristic firing on innocent behavior. If you fold these into your real crash signatures you will chase phantom bugs, and if you ignore them you will miss that a chunk of your players are being kicked for no reason, which is its own serious problem.

The inverse also happens: the anti-cheat masks a real crash. Because it intervenes in the process so heavily, a genuine null dereference in your code can surface as a generic anti-cheat termination, hiding the actual fault behind the protection's own shutdown. The defense against both is the same. Tag every report with whether anti-cheat was active and which one, treat anti-cheat terminations as their own category, and look at the underlying state you captured before the protection stepped in. Separating the two failure families is the single most valuable thing you can do here.

Capture the protection context on every report

The discipline that makes anti-cheat noise manageable is recording the protection environment on every single crash, whether or not you suspect the anti-cheat is involved. That means the anti-cheat product, its exact version, the OS build, the GPU and driver versions, and any overlay or security software you can detect. These fields cost almost nothing to capture and they are the difference between a crash queue you can reason about and a pile of unattributable terminations. When a spike arrives, the first query you run is always whether the affected reports share an anti-cheat version, and that query only works if the field is there.

Capture also has to survive the protection itself, which means installing your handler in a way the anti-cheat tolerates and capturing the pre-fault state early, before the protection begins tearing the process down. Record a compact snapshot of game state and recent activity as you go, rather than relying on walking the stack at the moment of death, when the anti-cheat may already be intervening. The goal is that even a crash the protection ultimately swallows still leaves behind enough context, recorded ahead of time, for you to reconstruct what the game was doing when it died.

Setting it up with Bugnet

With the Bugnet SDK integrated, the in-game report button and automatic crash capture record the context that makes anti-cheat noise legible: the active anti-cheat product and version, OS build, GPU and driver versions, and the game state captured before the fault, all attached to every report. When a session is killed by the protection rather than by your code, that distinction is visible in the data instead of buried, so you can route anti-cheat terminations to one bucket and genuine exceptions to another from the start.

Occurrence grouping then does the heavy lifting across a multiplayer player base. A driver-level interaction hitting one anti-cheat version folds into a single grouped issue with a count, and a custom field for the anti-cheat version lets you filter the whole queue to confirm a cluster is environmental rather than yours. You can see at a glance whether a spike of crash reports came from a real regression you shipped or from an anti-cheat update that rolled out the same week, and prioritize accordingly, all from one dashboard instead of a spreadsheet of guesses.

Test with the protection live

The most common mistake is testing crash handling with anti-cheat disabled because it is easier, then shipping with it enabled and discovering your handler never runs. Anti-cheat changes the runtime so fundamentally that crash capture verified without it tells you almost nothing about production. Build a test path where the protection is active and deliberately trigger a fault, then confirm a complete, symbolicated report actually arrives. If the anti-cheat blocks your handler, you need to know during development, while you can still coordinate an exception with the vendor or adjust how and when you capture.

Coordinate with the anti-cheat vendor early, because most have documented ways to allow legitimate diagnostics and crash handlers to coexist with their protection. Keep your reporter's behavior boring and predictable so it does not resemble the techniques the protection hunts for, and capture enough environment detail that you can always answer the first question: was the protection in the loop when this crashed. A multiplayer game that tests crash reporting with anti-cheat live ships with data it can actually trust, instead of a comforting illusion that evaporates on launch day.

Anti-cheat sits between your game and the OS, right where crash handlers live. Always record which protection was active, or you cannot trust any crash you collect.