Fixing and Diagnosing App Crashes Using Haiku's Debug Server
An application crashes on Haiku and a debug report window appears. Rather than dismissing it, here's how to actually read what it's telling you and use it to fix — or usefully report — the crash.
When an application crashes on Haiku, the system’s debug_server intercepts the fault and offers a report — a genuinely useful diagnostic tool that’s easy to dismiss reflexively without reading, distinct from Tracker specifically crashing, which is one particular application among many debug_server can catch.
Step 1: don’t dismiss the crash dialog immediately
When a crash dialog appears:
"Debug this team" / "Kill this team" / "Save report" optionsBefore just killing the crashed process, either option that captures diagnostic information is worth taking — the dialog is your only easy window into what actually went wrong at the moment of the crash.
Step 2: save a full crash report
Crash dialog → Save Report →
choose a location for the generated report fileThis generates a text report including the crash signal type, a stack backtrace of the crashing thread, and loaded image (library) information — genuinely useful whether you’re debugging your own code or filing a bug against someone else’s application.
Step 3: read the stack backtrace for a starting point
Report → look for the topmost application-specific frames
(not system library frames) in the backtraceThe very top frames are often deep inside system libraries (memory allocation, rendering); the first frame that’s clearly inside the crashing application’s own code is usually the most useful starting point for understanding what it was doing when it crashed.
Step 4: check the crash signal type for a quick category
Common signal types point at broad categories: a segmentation fault typically means invalid memory access (a null or corrupted pointer); an illegal instruction can mean corrupted executable code or a CPU feature mismatch; an abort signal often means the application itself detected an internal inconsistency and deliberately terminated.
Step 5: use the Debugger app for live, interactive debugging
Crash dialog → Debug this team →
opens Haiku's native Debugger applicationRather than just a static report, choosing to debug live lets you inspect variable values, thread states, and step through execution at the point of the crash — considerably more powerful than the saved report alone, at the cost of needing to actually investigate interactively rather than walking away with a file.
Step 6: check for a known issue if the crashing app is third-party
HaikuDepot → the application's page →
check for a newer version or known issue reportsA crash in packaged third-party software may already be fixed in a newer version, or already tracked as a known issue — worth checking before assuming you’re the first to hit it.
Step 7: file a useful bug report if it’s a genuine, reproducible bug
https://dev.haiku-os.org/ → New Ticket →
attach the saved crash report + steps to reproduceA crash report with a full backtrace attached, alongside clear reproduction steps, is dramatically more actionable for a developer to act on than “the app crashed” alone — this is the single biggest thing you personally control that affects whether a report actually gets fixed.
Why debug_server’s design matters here
Haiku’s debug_server intercepts crashes system-wide rather than leaving each application to handle its own crash reporting (or, more commonly on some other systems, simply vanish with no diagnostic trace at all) — this consistent, OS-level crash-handling behavior is what makes a saved report from any Haiku application follow the same useful format, whether it’s a core system app or something installed from HaikuDepot yesterday.