GCC Version Mismatch
GCC version mismatches cause C++ extension compilation failures and runtime library incompatibilities.
GCC version mismatches cause C++ extension compilation failures and runtime library incompatibilities.
What this failure is
GCC Version Mismatch is a Environment failure seen during ML training runs. GCC version mismatches cause C++ extension compilation failures and runtime library incompatibilities. Common tags: Gcc, Compiler, Libstdc++, Environment.
Is this what broke your run? Paste your log.
You're reading about GCC Version Mismatch. Paste your own crash log or traceback below and get the real root cause for YOUR run, not this generic entry. No account, no card. Logs are masked at ingress and never saved to account history.
Want 14 days on the Scale plan?
Request an evaluation code. A verified workplace organization activates up to 50 diagnoses a day, alerts, history, and follow-up questions. No credit card or automatic subscription.
Why it happens (the mechanism)
GCC version too old for extension. GCC version too new for OS. Libstdc++ missing symbols. Container GCC differs from host. Taken together, these mechanisms explain why the failure is reproducible, why it tends to surface on specific workloads or scales, and why generic mitigation attempts often fall short without addressing the underlying cause.
What you'll observe
- C++ extension fails to compile
- libstdc++ version not found
- undefined symbol at runtime
Common symptoms and what they mean
| Symptom | Why it happens |
|---|---|
| error: command 'gcc' failed with exit status 1 | GCC version too old for extension |
| ImportError: /lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.29' not found | GCC version too new for OS |
Which systems are affected
- Installing packages from source
- Custom CUDA extensions
- Older OS with newer compiler-built wheels
How to confirm this is the problem
Use this checklist to test the hypothesis against a small reproduction. No single line proves the root cause, so preserve the preceding events and compare one variable at a time.
- ✓Reproduce the failure from a clean checkpoint/seed: the symptom must appear without warm-up state from a previous run.
- ✓Verified signal present: error: command 'gcc' failed with exit status 1
- ✓Verified signal present: ImportError: /lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.29' not found
- ✓A targeted fix from the "How to fix it" section eliminates or substantially reduces the symptom within one validation pass.
The fix and the prevention pattern
The root cause is on this page and stays free. A free account adds the exact remediation steps, saved history, and the fix on every entry in the encyclopedia.
Sign up free. Unlock the full analysisNo credit card. Daily allowance follows verified trust tier. Instant access.
Diagnose this failure in VS Code
Select the traceback or open the failed terminal, then run Denpex locally to see the initiating rank, collateral failures, exact fix, and verification command without uploading the log.
Install the free VS Code extensionRelated failures to investigate next
Root cause
- GCC version too old for extension
- GCC version too new for OS
- libstdc++ missing symbols
- Container GCC differs from host
The fix and how to prevent it
Evaluate Denpex on your own logs
Request a Scale evaluation code. A verified workplace organization activates 14 days with up to 50 diagnoses a day. Every account keeps its current diagnosis allowance and gets a verification path. No card or automatic subscription.
References
Don't just read the fix, diagnose your run
The encyclopedia tells you what went wrong. Denpex tells you what went wrong in YOUR training run. With your logs, your config, and your stack.