Recent QEMU segfaults compiling PHP extensions for amd64 on the runner's 6.8 kernel (docker/buildx#3170); QEMU 8.1.5 is the version reported to work. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01V9NnLxnPp8vaaurb3Z1MFy