Claude Code crashed on startup on glibc 2.44, and 2.1.245 says so by name
The release published at 05:13 UTC on August 25 fixes a startup crash on Linux distributions shipping glibc 2.44 — Arch Linux, CachyOS and Fedora Rawhide are named. If the CLI stopped opening on a rolling-release machine this week, this is why.
Claude Code v2.1.245 has one line in its changelog: a fix for a crash on startup on Linux distributions that ship glibc 2.44, with Arch Linux, CachyOS and Fedora Rawhide given as examples. For anyone on those systems the practical instruction is short — update, and the CLI opens again.
Why rolling releases hit it first
The named distributions have one thing in common: they take a new glibc as soon as it is released rather than at the next distribution version. That puts their users at the front of the queue for exactly this class of failure, where the tool was built and tested against an older C library than the one it lands on.
The rest of the Linux world will meet glibc 2.44 later, through a normal release upgrade. By then the fix is already in, which is the ordinary and quiet way this usually goes.
A changelog that names the cause is worth reading
Anthropic ships Claude Code often — six releases carry a date between August 20 and August 25 in the public feed. Several of them say only “Bug fixes and reliability improvements,” which tells a user nothing about whether their problem is fixed.
This one is the opposite: it names the library, the version, and three distributions. That is the difference between a note you skip and a note that answers a question you had this morning. Nothing else changed in 2.1.245.
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