{"record":{"id":"99fb09d49cc683fa","repo":"nats-io/nats-server","slug":"loadblock-error-v","errorCode":null,"errorMessage":"loadBlock error: %v","messagePattern":"loadBlock error: (.+?)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"server/filestore.go","lineNumber":8922,"sourceCode":"\t// FIXME(dlc) - We could be smarter here.\n\tif buf, _ := mb.bytesPending(); len(buf) > 0 {\n\t\tld, err := mb.flushPendingMsgsLocked()\n\t\tif ld != nil && mb.fs != nil {\n\t\t\t// We do not know if fs is locked or not at this point.\n\t\t\t// This should be an exceptional condition so do so in Go routine.\n\t\t\tgo mb.fs.rebuildState(ld)\n\t\t}\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\t\tgoto checkCache\n\t}\n\n\t// Load in the whole block.\n\t// We want to hold the mb lock here to avoid any changes to state.\n\tbuf, err := mb.loadBlock(nil)\n\tif err != nil {\n\t\tmb.fs.warn(\"loadBlock error: %v\", err)\n\t\tif err == errNoBlkData {\n\t\t\tif ld, _, _ := mb.rebuildStateLocked(); ld != nil {\n\t\t\t\t// Rebuild fs state too.\n\t\t\t\tgo mb.fs.rebuildState(ld)\n\t\t\t}\n\t\t}\n\t\treturn err\n\t}\n\n\t// Check if we need to decrypt.\n\tif err = mb.encryptOrDecryptIfNeeded(buf); err != nil {\n\t\treturn err\n\t}\n\t// Check for compression.\n\tif buf, err = mb.decompressIfNeeded(buf); err != nil {\n\t\treturn err\n\t}\n","sourceCodeStart":8904,"sourceCodeEnd":8940,"githubUrl":"https://github.com/nats-io/nats-server/blob/3a66a489d262bf89b71a71c955c94920394532f3/server/filestore.go#L8904-L8940","documentation":"A warning logged when msgBlock.loadBlock() fails while loading a whole message block from disk (e.g. during cache loading after pending flush). For errNoBlkData the block is treated as empty; other errors indicate I/O or corruption problems reading the block file, which propagate to the caller.","triggerScenarios":"Thrown at server/filestore.go:8922 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Check disk health and filesystem errors for the block file path in the wrapped error","If errNoBlkData, the block is handled as empty — usually benign","Restore corrupt or missing block files from backup","Verify available disk space and permissions in the store directory"],"exampleFix":null,"handlingStrategy":"fallback","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"3a66a489d262bf89b71a71c955c94920394532f3","analyzedAt":"2026-09-02T04:41:54.247Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}