Quick answer: Linux means two realities: a native ELF build whose crashes are POSIX signals, or a Windows binary run through Proton, where a fault can live in your code, in Wine, in DXVK or VKD3D, or in the Vulkan driver. Capture native signals with build id symbolication, record the full Proton and driver stack on every report, and use the Steam Deck as a fixed anchor for reproduction.
Shipping to Linux means two distinct realities: a native ELF build, or a Windows binary run through Proton, the Wine based translation layer that Steam uses. Each fails differently. A native crash is a signal in your own process; a Proton crash can originate in the Windows code, in the translation of system and graphics calls, or in the Vulkan driver underneath. Untangling that is the work, and the only way to do it is to capture enough environment on every report to tell whether the fault is your bug, a translation layer regression, or a driver issue you should escalate upstream. This post covers native signal handling, the Proton stack from Wine through DXVK and VKD3D to Vulkan, and the enormous variance across distributions and drivers.
Native Linux signals
A native Linux port is an ELF binary, and a crash arrives as a POSIX signal: SIGSEGV for a bad memory access, SIGABRT from an assertion or a failed library check, SIGFPE for arithmetic faults. You install a sigaction handler early and, from inside it, do only async signal safe work: record the signal, the faulting address, and walk the stack with a safe unwinder, then persist for upload on the next launch. Doing anything that allocates inside that handler risks deadlocking on a corrupt heap and losing the report entirely.
Symbolication needs the build id. Linux binaries carry a unique build id in their notes section, and your separated debug symbols are matched by that id. Keep the debug info for every shipped build, because stripping the release binary is standard and an unstripped stack on a player machine is rare. With the build id and matching symbols, an address resolves to your function, file, and line, and without them a native Linux crash is as opaque as a stripped binary on any other platform.
The Proton translation stack
Proton runs a Windows build by translating system calls through Wine, Direct3D 11 through DXVK to Vulkan, and Direct3D 12 through VKD3D, also to Vulkan. A crash can therefore land in your game code, in Wine emulation, in the DXVK shader translation, or in the Vulkan driver. The backtrace mixes Windows module names with Linux library names, and recognizing which layer owns a frame is the first triage decision, because the fix and the team responsible differ completely between them.
Because the process is a Windows binary under Wine, the crash presents as a Windows exception inside the Wine process, but the underlying fault may be a Linux signal that Wine intercepts. Capturing the Proton version, the DXVK and VKD3D versions, and the Wine build alongside your report is essential, since a crash that only happens under one Proton release is almost certainly a translation layer regression and not your code. Without those versions you cannot make that call and will waste effort auditing logic that was never wrong.
Vulkan drivers and GPU variance
Whether native or under Proton, modern Linux rendering goes through Vulkan, and the driver is a major crash surface. The Mesa drivers for AMD, the proprietary driver for NVIDIA, and the Intel driver all differ, and a shader that compiles on one can crash another. Capture the Vulkan device name, the driver name and version, and the GPU vendor, because a crash that clusters on one driver is a driver or shader compatibility issue, not a universal bug, and clustering is the only signal that reveals it.
Vulkan validation does not run in production, so subtle API misuse that the validation layers would have flagged surfaces only as a driver crash in the field. Recording whether you hit a device lost event and the last few Vulkan calls before the fault helps distinguish a genuine GPU hang from a logic crash, and points you toward the specific pipeline or descriptor the driver could not tolerate. That detail turns an intermittent crash on one vendor into a concrete rendering bug you can reproduce and fix or work around.
Distro and desktop variance
Linux is not one platform. The system library version, the kernel, the desktop environment, the display server with the older protocol versus the newer one, and the audio stack all vary by distribution and even by user configuration. A crash on startup might be a missing shared library on one distro, a window behavior specific to one display server, or an audio backend that does not exist. Capture all of these so the same backtrace can be split by environment rather than treated as one undifferentiated pile.
The Steam Deck is a useful anchor point because it is a fixed configuration running Proton, and a crash that reproduces there is far more actionable than one scattered across a thousand bespoke desktops. Tag Deck sessions explicitly. When a signature appears only outside the Deck, the environment metadata you collected is the only way to find the common factor across otherwise dissimilar machines, which is the difference between a fixable bug and an eternal could not reproduce.
Setting it up with Bugnet
For native builds, link the Bugnet Linux SDK and initialize it before your main loop so its sigaction handler is installed ahead of any work. It captures the signal, the backtrace, the build id, and the environment, then uploads on the next launch. You upload your separated debug symbols indexed by build id, and Bugnet resolves addresses to functions and folds crashes together with occurrence grouping, with per distro and per kernel breakdowns and an in game report button for non fatal issues.
For Proton, you ship the same Windows crash integration you would use on Windows, and the SDK records the runtime environment including the Proton, DXVK, VKD3D, and Vulkan driver versions exposed through the Wine environment. Bugnet then lets you split crashes by Proton version and by GPU driver, which is exactly the axis you need: a signature confined to one Proton release or one driver version points away from your code and toward the layer to report upstream, and occurrence counts tell you how many players it actually affects.
Operating across the matrix
The Linux crash distribution is dominated by environment as much as by code. Sort by signature, but always cross reference Proton version, GPU driver, and distro, because the highest occurrence signature is frequently a single driver bug affecting many users rather than many bugs. Fixing or working around that one driver path can clear a large fraction of your volume at once, which is a far better return than chasing scattered tail signatures.
After each release, confirm symbol upload succeeded for native build ids and that Proton reports carry their translation layer versions. Driver and Proton updates ship continuously outside your control, so a new spike often correlates with a platform update rather than your patch. A regular review of signatures split by environment keeps you from chasing a fix in your code when the fault lives in a layer you do not own, and gives you the evidence to file a precise bug with the Proton or driver maintainers instead.
Linux crash reporting is a two world problem: native signals with build id symbolication, and Proton crashes layered over Wine, DXVK, VKD3D, and Vulkan. Capture Proton, driver, kernel, and distro versions on every report so you can tell your bug from a layer you should escalate.