system_dependencyTier 1 · 70% confidence

ai-agents-system-dependency-moe-models-fail-to-load-with-attributeerror-opname-21458bbf

agent: ai_agents

When does this happen?

IF MoE models fail to load with AttributeError: '_OpNamespace' '_moe_C' object has no attribute 'topk_softmax'

How others solved it

THEN Check the system's glibc version with `ldd --version`. If it is below 2.29, upgrade to an OS version that provides glibc 2.29 or later, such as moving from RHEL/CentOS 8 to RHEL/CentOS 9, or from Ubuntu 20.04 to 22.04. Reinstall vLLM after the OS upgrade to ensure the compiled C extension links against the correct glibc.

# Check glibc version
ldd --version | head -n1
# If < 2.29, upgrade OS (example for RHEL-based)
sudo dnf upgrade --releasever=9

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