A flaky test exposed a Redis client use-after-free

DrNemski 38 points 11 comments July 22, 2026
buildkite.engineering · View on Hacker News

Discussion Highlights (3 comments)

VerifiedReports

That makes no grammatical sense.

serious_angel

Thank you very much! This is great read! Though, no actual steps mentioned, including the: > From this, he ascertained that the exception was triggered by a call to the C function memmove. While the source and destination addresses for this call looked sane, the size field was set to... I do get the most of these stated, but it would be awesome to know more about how he did actually find it, and with what toolset. Was is gdb, Valgrind, JetBrains, IDA Pro, or some another general/complex dump viewer/toolset? And, the interactive miracle, at the top of the website is freaking marvelous... It reminded me of the articles of the fluid simulation algorithms of Yusuke Endoh! Heartfelt gratitude to the developer, the artist who implemented it! Apparently, behind the scene, the fluid colors are contained in an array where every single color has a defined meaning! // categories in STACK order: index 0 at the floor → 4 at the surface const CATS = [ { key: "Code", rgb: [133, 232, 157] }, { key: "Craft", rgb: [179, 146, 240] }, { key: "Lessons", rgb: [249, 117, 131] }, { key: "Story", rgb: [255, 171, 112] }, { key: "Opinion", rgb: [158, 203, 255] }, ];

toast0

> Harder still is when the cause of the bug happens prior to its manifestation. I've yet to debug a big where the manifestation happens prior to the cause... Sounds even harder. :p

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