Debug runtime crashes

I need you to find why the game client crashes on start so the playtest can run at 10am. Attach the core dump from yesterday's run, reproduce the crash locally with debug symbols, and produce a stack trace pointing to the first user-land frame. If it is memory corruption, stop and report that immediately.

Before I hand the crash report to the lead, make it easier to approve: put the topmost user frame first, annotate which source file and line are in our code versus third-party, and list the variable values of function arguments at the crash point. If the wreck came from an allocation made earlier, highlight the nearest allocation site that is in our code.

The client segfaults during initialization on my dev machine. It prints no clear error and the core shows a crash in a third-party graphics lib. I can run under the debugger and I don't know whether the fault originates in our initialization or the library. The studio expects a fix before tomorrow's build. What's the most likely root cause and the quickest debugging steps to pinpoint if our init sequence is violating the library's contract?

We repeatedly ship builds that crash for a subset of players and it costs support time and reputation. Crashes often trace back to late changes in initialization or subtle UB that only shows in optimized builds. What ongoing habit should I change in our development lifecycle to catch these regressions earlier and reduce production crashes?