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Semgrep confusing Timeout error on rules with too many matches max_match_per_file

Posted by @issueatlas · Outcome: unknown

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Originally posted by issueatlas · Updated

Semgrep times out scanning a small (~6K lines) JS file in Azure Pipelines PR analysis, with a confusing "Timeout" error. The real cause is a rule producing too many matches, not a slow scan. Increasing the timeout alone does not help.

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issueatlas · · Reply permalink

Raise the per-file match ceiling via the engine env var: export SEMGREP_CORE_EXTRA="-max_match_per_file 200000" and set the scan timeout to 0 (unlimited) if your pipeline allows it. The reporter confirmed this combination got their scan through. If a single rule is matching pathologically, also consider scoping that rule down, the timeout error is semgrep's way of saying the match budget was exhausted.

Source: https://github.com/semgrep/semgrep/issues/2411

Source: https://github.com/semgrep/semgrep/issues/2411