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IT Services Circle
IT Services Circle
Aug 5, 2024 · Fundamentals

Ariane 5 Rocket Explosion Caused by a Software Integer‑Overflow Bug

The 1996 Ariane 5 launch failed and exploded due to a single line of legacy code that caused a 64‑bit floating‑point to 16‑bit signed integer conversion overflow in the guidance system, highlighting the dangers of unchecked code reuse, inadequate error handling, and insufficient testing in critical software.

Software Engineeringdata type conversioninteger overflow
0 likes · 6 min read
Ariane 5 Rocket Explosion Caused by a Software Integer‑Overflow Bug
Liangxu Linux
Liangxu Linux
Jul 25, 2024 · Fundamentals

Uncovering a 55‑Year‑Old Bug in the Original Lunar Lander Game

A retired software engineer revisits the 1969 text‑based Lunar Lander game, exposing a decades‑old mathematical error that causes the simulation to misjudge soft landings, and explains the physics, numerical approximations, and optimal burn strategies behind the classic program.

Lunar LanderNumerical MethodsRetro Gaming
0 likes · 11 min read
Uncovering a 55‑Year‑Old Bug in the Original Lunar Lander Game
21CTO
21CTO
Dec 6, 2023 · Operations

How One Line of C Code Crippled AT&T’s Network for 9 Hours

A 1990 AT&T network outage caused by an untested C code change led to a nine‑hour service collapse, massive financial loss, and widespread disruption, illustrating how a single software bug can trigger cascading failures in large‑scale telecommunications systems.

AT&TC programmingnetwork outage
0 likes · 6 min read
How One Line of C Code Crippled AT&T’s Network for 9 Hours
DevOps
DevOps
Mar 25, 2016 · Operations

Case Study: The 2005 Mizuho Securities Fat‑Finger Trading Error and Its Legal Aftermath

The 2005 Mizuho Securities “fat‑finger” incident, caused by a trader’s input error and a hidden bug in the Tokyo Stock Exchange’s Fujitsu‑built trading system, led to a ¥400 billion loss, sparking extensive litigation that highlighted responsibilities for software bugs, system testing, and operational risk management.

Software Testingfinancial systemslegal case
0 likes · 12 min read
Case Study: The 2005 Mizuho Securities Fat‑Finger Trading Error and Its Legal Aftermath
21CTO
21CTO
Jan 2, 2016 · Operations

How a Single Deployment Mistake Cost Knight Capital $460 Million

A disastrous software deployment at Knight Capital left an outdated code path active on one server, causing millions of erroneous orders that wiped out $460 million in seconds and highlighted critical failures in testing, monitoring, and incident response processes.

Technical DebtTrading Systemsdeployment failure
0 likes · 7 min read
How a Single Deployment Mistake Cost Knight Capital $460 Million