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Why does std::chrono::system_clock::now() move backwards inside a running C++ program on some Linux systems?

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Summary std::chrono::system_clock can move backwards on Linux because it reflects the system’s real-time clock, which can be adjusted by NTP or other time-correction mechanisms. When the OS steps the clock backward, your process observes that jump. It is not monotonic and never guaranteed to be. For monotonic timestamps, use std::chrono::steady_clock. Root Cause The backward time … Read more

Microsoft store application is not working

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Summary The Microsoft Store application failure on Windows 10/11 was caused by corrupted system files and cache issues, preventing the app from launching or updating. Root Cause Corrupted Windows Store cache in %LocalAppData%\Packages\Microsoft.WindowsStore_8wekyb3d8bbwe\LocalCache. Missing or damaged system files related to the Microsoft Store. Why This Happens in Real Systems Incomplete updates or sudden system shutdowns … Read more

Azure Application Gateway in front of an external Azure Container Apps environment

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Summary The 404 errors occur because Azure Container Apps (ACA) with internal ingress only accepts traffic originating from within its own ACA-managed environment, not from other subnets in the same VNET. An Application Gateway placed in a different subnet cannot reach those internal endpoints, even though they share the same VNET. Root Cause The failure … Read more

How to spread Jobs on multiple frames?

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Summary The job system completed all work in a single frame because no asynchronous boundary existed between scheduling and completion. Unity’s Job System will happily execute all pending jobs immediately in the same frame if the main thread becomes idle or if the job dependencies allow it. The result is that work you expected to … Read more

How do I manually back up a supabase database via CLI?

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Summary This postmortem analyzes a failure to manually back up a Supabase‑hosted PostgreSQL database using pg_dump on macOS. The core issue was incorrect connection strings and attempting to use the connection pooler instead of the primary database host, which prevents pg_dump from connecting. The result was repeated hostname translation errors and authentication failures. Root Cause … Read more

How to navigate to clazy warning in Qt Creator?

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Summary A misalignment between Qt Creator’s diagnostic ingestion pipeline and clazy’s export‑fixes behavior prevents non‑fixit clazy warnings from appearing in the Issues pane. Qt Creator only displays diagnostics that arrive through its structured export‑file mechanism, but clazy emits structured data only for warnings that have fixits, leaving all other warnings stranded in the Application Output … Read more

Why does POSIXlt behavior differ in R when its S3 class is lost inside of vs. outside of a data.frame?

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Summary This incident examines why POSIXlt behaves differently when its S3 class is lost inside vs. outside a data.frame. The behavior surprises many engineers because POSIXlt is a deeply nested list-based S3 class, and R’s assignment semantics interact with it in ways that differ from simpler S3 vectors. The result is inconsistent coercion: list‑coercion in … Read more

Ensuring adjacent ranges in PostgreSQL

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Summary This incident examines a subtle but common data‑modeling failure: attempting to enforce temporal adjacency constraints in PostgreSQL using range types and exclusion constraints. While PostgreSQL 18’s WITHOUT OVERLAPS solves non‑overlapping ranges elegantly, enforcing gap‑free adjacency requires logic that exclusion constraints alone cannot guarantee. Root Cause The root cause is that PostgreSQL’s range operators and … Read more

Android Zebra / WebView drops session cookie after AJAX login over intranet HTTP, works on desktop browsers (SameSite/Secure?)

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Summary The issue at hand involves an inconsistent login behavior on a Zebra PDA using an Android embedded browser or WebView when accessing a web app over plain HTTP on an intranet IP. The login is handled via AJAX, and the server returns a success response with a Set-Cookie header. However, the session cookie is … Read more

Inline Assembly Bug in gcc?

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Summary This incident analyzes a subtle inline assembly constraint bug that appears only under GCC with high optimization levels. The program prints garbage instead of “Hello, World!\n” when compiled with -O3, even though it works correctly with -O0 and under Clang. The failure stems from incorrect assumptions about how GCC allocates registers for inline assembly … Read more