The Daily Index — Tuesday, December 16, 2025 · TLDR Index

ARTICLES & TUTORIALS

TLDR Dev

TLDR Dev

HOW A KERNEL BUG FROZE MY MACHINE: DEBUGGING AN ASYNC-PROFILER DEADLOCK

This dev encountered a persistent machine freeze on their Linux kernel when using async-profiler for QuestDB. After reproducing the issue in a QEMU virtual machine, they used GDB to trace the problem to a specific kernel bug within a `perf_events` subsystem function. This bug caused a self-deadlock when a high-resolution timer attempted to cancel itself while its callback was still executing, making all CPUs unresponsive.

questdb.com · 23 min

TLDR Dev

WHAT DOES A DATABASE FOR SSDS LOOK LIKE?

Most relational databases were invented in the 90s and 00s, the era of spinning disks. Design decisions were made when I/O was slow and sequential I/O was orders of magnitude faster than random. This post looks at what would change and what would remain if we had to begin from scratch to build a new database in 2025.

brooker.co.za · 10 min

TLDR Dev

THE `TIME` ELEMENT SHOULD ACTUALLY DO SOMETHING

The HTML 'time' element is supposed to be a semantic way to express the exact timestamp of a date, but no browser or assistive technology actually makes use of it, besides rendering it. It seems to be used by search engines to show date snippets in search results, but there aren't any real guidelines for using it. The time element is a good idea, but in practice, it feels like an unfulfilled promise of semantic HTML.

nolanlawson.com · 2 min

TLDR Dev

STACK OVERFLOW USERS DON'T TRUST AI. THEY'RE USING IT ANYWAY

AI created an "existential moment" for Stack Overflow. In response, CEO Prashanth Chandrasekar led a pivot, turning the company into primarily an enterprise SaaS business providing AI-based solutions and establishing a data licensing operation with major AI labs. Despite over 80% of users wanting to use AI for code-related topics, only 29% trust it, so Stack Overflow banned AI-generated answers on its public platform while also launching AI Assist, which prioritizes its trusted human-curated content.

theverge.com · 56 min

TLDR Dev

GRAPHQL: THE ENTERPRISE HONEYMOON IS OVER

GraphQL, despite solving a niche problem like overfetching, often is a net negative in enterprise environments because its benefits are frequently redundant with existing BFFs, while introducing more complexities in implementation.

johnjames.blog · 6 min

TLDR Dev

IT'S UNCOMFORTABLE TO SIT WITH “I DON'T KNOW”

Human discomfort with admitting "I don't know" drives us to readily accept convenient, but not always true, certainty, especially from sources like AI, even when logic suggests these sources are unreliable on unfamiliar topics.

blog.jim-nielsen.com · 3 min

TLDR Dev

CHECKPOINTING THE MESSAGE PROCESSING

Checkpointing message processing in event-driven architectures is similar to save points in old video games.

event-driven.io · 12 min