sgl-project/sglang · error · StageVerificationError

{} verification failed for {}: Failed fields: {}\nDetails: {

Error message

{} verification failed for {}: Failed fields: {}\nDetails: {}

What it means

StageVerificationError raised by Stage._run_verification when pre/post stage input/output verification detects fields failing validation; it lists the failed fields plus a detailed per-field summary. Runs automatically inside Stage.__call__.

Source

Thrown at python/sglang/multimodal_gen/runtime/pipelines_core/stages/base.py:340

        Args:
            verification_result: Results from verify_input or verify_output
            stage_name: Name of the current stage
            verification_type: "input" or "output"
        """
        if not verification_result.is_valid():
            failed_fields = verification_result.get_failed_fields()
            if failed_fields:
                # Get detailed failure information
                detailed_summary = verification_result.get_failure_summary()

                failed_fields_str = ", ".join(failed_fields)
                error_msg = (
                    f"{verification_type.capitalize()} verification failed for {stage_name}: "
                    f"Failed fields: {failed_fields_str}\n"
                    f"Details: {detailed_summary}"
                )
                raise StageVerificationError(error_msg)

    @property
    def device(self) -> torch.device:
        """Get the device for this stage."""
        return torch.device(
            current_platform.device_type,
        )

    def set_logging(self, enable: bool):
        """
        Enable or disable logging for this stage.

        Args:
            enable: Whether to enable logging.
        """
        self._enable_logging = enable

    def __call__(

View on GitHub (pinned to 0132848349)

Solutions

1. Read the Failed fields/Details in the message to identify the offending field
2. Fix the upstream producer or the stage's verification spec so they agree
3. Temporarily relax verification config for debugging, then re-enable

null

try:
    out = stage(inp)
except StageVerificationError as e:
    log_verification_failure(stage.name, e); raise

When it happens

Trigger: A stage whose declared input/output schema fields fail type/shape/content verification when the stage is invoked in the pipeline.

Common situations: Pipeline wiring changes pass a tensor of wrong dtype/shape; a stage's verification config drifts from what upstream stages emit; version upgrade tightening verification rules.

Understand the failure class

Background: Schema validation failed / invalid input schema: payload rejected because its shape doesn't match the expected schema — this error's family across 28 libraries.

Related errors

• batching config rule from {source} must be an object, got {t
• {} did not declare component use: {}
• canonical request missing {key!r}
• {kind} transition actions must be a list
• Invalid external ngram corpus record at line {line_no}: expe

AI-assisted analysis of sgl-project/sglang@0132848349 (2026-08-28). Data as JSON: /api/errors/bd4b0f88bbaff682. Report an issue: GitHub.