{"record":{"id":"8f4f3b9ea005820e","repo":"crowdsecurity/crowdsec","slug":"failed-to-generate-initial-challenge-bundle-w","errorCode":null,"errorMessage":"failed to generate initial challenge bundle: %w","messagePattern":"failed to generate initial challenge bundle: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"critical","filePath":"pkg/appsec/challenge/challenge.go","lineNumber":489,"sourceCode":"\t\tpowDifficulty:      defaultPowDifficulty,\n\t\tkeys:               keys,\n\t\tcryptoPoolSize:     cryptoPoolSize,\n\t\tdynamicModuleCache: make(map[int64][]string),\n\t\tcookieTTL:          cookieTTL,\n\t\tmaxCookieLen:       maxCookieLen,\n\t\thtmlTpl:            htmlTpl,\n\t\tspent:              newSpentSet(spentSetMaxEntries),\n\t\tlogger:             logger,\n\t}\n\n\t// Load the build-time-obfuscated challenge code from the baked-in bundle so\n\t// we can serve immediately.\n\tif err := challengeRuntime.seedCacheFromInitialBundle(); err != nil {\n\t\t// Initial bundle missing/corrupt (e.g. `go generate` not run): fall back\n\t\t// to obfuscating the challenge code synchronously.\n\t\tlogger.Warnf(\"failed to load baked-in initial challenge bundle (%v); falling back to synchronous generation\", err)\n\t\tif err := challengeRuntime.generateAndCacheChallengeJS(ctx); err != nil {\n\t\t\treturn nil, fmt.Errorf(\"failed to generate initial challenge bundle: %w\", err)\n\t\t}\n\t}\n\n\t// Pre-warm the current epoch's dynamic module so the first GetChallengePage\n\t// doesn't pay the ~5s obfuscation cost on the request path. The background\n\t// pre-warmer then re-obfuscates on every rotation; it runs under a context\n\t// owned by Close() rather than the constructor ctx, so a reload (which\n\t// reuses the process ctx) can stop it — see Close().\n\tif !resolvedOpts.skipPreWarm {\n\t\tif _, err := challengeRuntime.currentDynamicModule(ctx); err != nil {\n\t\t\treturn nil, fmt.Errorf(\"warm dynamic key module: %w\", err)\n\t\t}\n\n\t\trunCtx, cancel := context.WithCancel(ctx)\n\t\tchallengeRuntime.preWarmCancel = cancel\n\t\tgo challengeRuntime.dynamicModulePreWarmer(runCtx)\n\t}\n","sourceCodeStart":471,"sourceCodeEnd":507,"githubUrl":"https://github.com/crowdsecurity/crowdsec/blob/909b5157986a2b2c2163300fdaef5ed01289f7d2/pkg/appsec/challenge/challenge.go#L471-L507","documentation":"NewChallengeRuntime first tries to seed the challenge JS cache from the baked-in initial bundle (generated at build time via `go generate`). If that bundle is missing or corrupt, it falls back to obfuscating the challenge code synchronously; if that synchronous generation also fails, the constructor aborts and this error wraps the underlying cause. The AppSec challenge runtime cannot start without at least one challenge bundle.","triggerScenarios":"Calling NewChallengeRuntime (directly or via Configure during AppSec component load) when seedCacheFromInitialBundle fails (bundle not generated / corrupt embed) AND generateAndCacheChallengeJS also returns an error (obfuscation timeout, context cancelled, crypto/template failure).","commonSituations":"Building from source without running `go generate`; a broken build that embedded an empty bundle; a startup context already cancelled/expired before obfuscation completes (obfuscation can take ~5s); resource exhaustion on constrained hosts.","solutions":["Run `go generate ./pkg/appsec/challenge/...` (or `make generate`) so the initial bundle is baked in, then rebuild.","Rebuild the binaries from a clean tree (`make build`) to regenerate the embedded bundle.","Ensure the startup context passed to NewChallengeRuntime is not already cancelled and the process is not starved of CPU (obfuscation takes ~5s).","Check the wrapped error in the message for the specific generation failure (crypto rand, template, etc.) and fix that root cause."],"exampleFix":"// before: startup ctx with a short timeout kills the ~5s obfuscation\nctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)\nrt, err := NewChallengeRuntime(ctx, opts)\n// after\nctx := context.Background()\nrt, err := NewChallengeRuntime(ctx, opts)","handlingStrategy":"fallback","validationCode":"// preflight: ensure the baked-in bundle exists before constructing\nif challenge.GetChallengeCode() == \"\" {\n    logger.Warn(\"initial challenge bundle missing; run `go generate` before building\")\n}","typeGuard":null,"tryCatchPattern":"rt, err := NewChallengeRuntime(ctx, opts)\nif err != nil {\n    if errors.Is(err, context.DeadlineExceeded) {\n        logger.Error(\"challenge init exceeded deadline; increase startup timeout\")\n    }\n    return fmt.Errorf(\"appsec challenge runtime init: %w\", err)\n}","preventionTips":["Always build via `make build` / run `go generate` so the bundle is embedded.","Give the constructor context a deadline well above the ~5s obfuscation cost.","Pin build steps in CI so a clean checkout still produces the bundle.","Alert on the 'falling back to synchronous generation' warning — it signals a broken embed."],"tags":["appsec","challenge","startup","initialization"],"backgroundTag":"module-init-failed","analyzedSha":"909b5157986a2b2c2163300fdaef5ed01289f7d2","analyzedAt":"2026-09-06T12:27:26.012Z","contentChangedAt":"2026-09-06T12:27:26.012Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}