Technical Analysis: How Ghostty's Memory Leak Was Identified and Fixed
By
thorel
Crisp on the outside, thoughtful on the inside. A keeper.
Summary
The article details the discovery and resolution of a significant memory leak in Ghostty, a terminal emulator. Users reported extreme memory consumption (up to 37GB after 10 days), which was traced to a leak present since Ghostty 1.0. The issue became more apparent as popular CLI applications like Claude Code created conditions that triggered the leak at scale. The post provides technical insights into Ghostty's internals and the debugging process that led to identifying and fixing the problem.
Key quotes
· 4 pulledusers started reporting that Ghostty was consuming absurd amounts of memory, with one user reporting 37 GB after 10 days of uptime
The leak was present since at least Ghostty 1.0, but it is only recently that popular CLI applications (particularly Claude Code) started producing the correct conditions to trigger it at scale
Today, I'm happy to say the fix has been found and merged
This post is an overview of what caused the leak, a look at some of Ghostty's internals, and some brief descriptions of how we tracked it down
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