[BUG] auto update broke claude code

To add to this

Bug Description

claude crashes immediately upon startup with a Segmentation Fault (SIGSEGV) on modern Linux distributions using rolling release glibc (such as Arch Linux and CachyOS).

Debugging via GDB reveals that the crash originates in the bundled binary's custom allocator when handling a standard free(NULL) call triggered by __newlocale during initialization.

Environment

• OS: CachyOS / Arch Linux (Rolling Release, latest glibc)
• Installation Method: npm install -g @anthropic-ai/claude-code
• Node.js Version: v24.12.0 (tested on Node LTS / current)

Steps to Reproduce

1. Install Claude Code globally via npm (npm install -g @anthropic-ai/claude-code).
2. Run claude in the terminal.
3. Process crashes instantly with exit code 139 (Segmentation fault).

Stack Trace (systemd-coredump)

#0  0x0000000001d10458 free (claude.exe + 0x1b10458)
#1  0x00007f53d9e3a1ab __newlocale (libc.so.6 + 0x3a1ab)
#2  0x0000000001abd282 n/a (claude.exe + 0x18bd282)
#3  0x00007f53d9eb2584 n/a (libc.so.6 + 0xb2584)
#4  0x00007f53d9eb26a9 pthread_once (libc.so.6 + 0xb26a9)
...
#16 0x00007f53d9e27e23 __libc_start_main (libc.so.6 + 0x27e23)

I tried a full reinstallation using the official script - https://claude.ai/install.sh.

This worked for me. CachyOS, same exact issue, now able to continue the work.

I am on CachyOS as well and discovered, I still had the previously installed version available on my system.
Downgraded it to 2.1.241 (changing the symlink) and ran update again, this time it worked without issues

rm ~/.local/bin/claude

ln -s ~/.local/share/claude/versions/2.1.241 ~/.local/bin/claude

claude update && claude --version

Current version: 2.1.241
Checking for updates to latest version...
Updating to 2.1.245...
Successfully updated from 2.1.241 to version 2.1.245
2.1.245 (Claude Code)

The faulty version was 2.1.243