Production Bugs

Summary A deployment attempt using NVIDIA’s l4t_initrd_flash.sh script failed because the Yocto-built kernel image (Image) was not in the expected gzip-compressed format (Image.gz). The engineer manually manipulated artifacts to circumvent the error, but the script improperly handled uncompressed kernels. The core issue stems from mismatched compression expectations in NVIDIA’s tools. Root Cause The l4t_initrd_flash.sh script … Read more

Summary A pip install psycopg2 command failed during native extension compilation with the error /usr/bin/ld: cannot find实际情况 -lpq, preventing successful installation. This occurred on a Debian 12 system after installing PostgreSQL 16.11, but did not occur with PostgreSQL 16.8 on an identical OS version. Root Cause The PostgreSQL development package (libpq-dev) was missing on the … Read more

Summary The goal is to create a reusable Test Step block in Tricentis Tosca to verify the title on different screens, despite the property type varying between TextBox and Container. Additionally, the name attribute is unstable, and other identifiers like Tag, className, and ID are not reliable. Root Cause The root cause of this issue … Read more

Cast Connect on Android TV: Background Activity Launch Blocked on Android 14 – Postmortem Summary Cast Connect initialization failed on Android 14 when launching the main activity from background state. This was caused by enforcement of依赖 Android 14’s BACKGROUND_ACTIVITY_START restrictions blocking foreground permissions during Cast session launches from terminated or backgrounded app states. Resolution requires … Read more

Summary The issue at hand is that vitest is throwing a ReferenceError complaining that require is not defined in an ES module scope, even though the test file does not explicitly use require. This error is confusing because the test file is written using ES module syntax and the package.json file does not have a … Read more

Summary A critical flaw was identified in the banking application’s account management system. State transitions between OpenedStateAccount and ClosedStateAccount lacked enforcement of transaction rules. When users attempted deposits/withdrawals on closed accounts, the system violated domain invariants by allowing illicit state-agnostic operations. Additionally, transaction methods ignored CAP theorem implications by processing all modes (Physical Cash, RTGS, … Read more

Summary The Flask application using Gunicorn+Eventlet handles hundreds of concurrent WebSocket connections but suffers severe slowdownsֶ when processing heavy I/O-bound tasks (e.g., batch database updates) in production. While functional in development using Flask’s dev server, scaling failed in production due to a single-worker architecture bottlenecked by I/O. Eventlet’s green threads couldn’t utilize multiple CPU cores, … Read more

Summary The Met Office DataHub API is returning a 404 Not Found error when attempting to retrieve data using the provided PHP script. The error is caused by an incorrect API endpoint URL. Root Cause The root cause of the issue is the incorrectly formatted API endpoint URL. The script is using a hardcoded URL … Read more

What are the security and feature checkpoints for considering an authentication system “complete” in a web application? Summary Web authentication systems are often deployed prematurely due to gaps in security controls and feature completeness, leading to vulnerabilities like credential leaks or account takeovers. This postmortem outlines essential safety nets and implementation requirements. Root Cause The … Read more