Merge #152973

152973: util/log: skip malformed log entries while reading from file r=aa-joshi a=aa-joshi

Previously, readAllEntriesFromFile was returning an error if the log file contains the malformed log entry. The malformed log entry primarily could be the unexpected panic log. This would result in failure in fetching the logs from file. This was inadequate because single log line can cause failure in reading rest of the logs which are with valid format. To address this, this patch skips the malformed log entries during decode and only valid log lines are returned.

Fixes: #149866
Informs: #151493
Release note: None

Co-authored-by: Akshay Joshi <akshay@cockroachlabs.com>

Author: craig[bot]

pkg/util/log/file_api.go

@@ -429,6 +429,13 @@ func readAllEntriesFromFile(
 			if err == io.EOF {
 				break
 			}
+
+			// skip the malformed log entry. This is primarily observed in the
+			// panic which is unstructured.
+			// See: https://github.com/cockroachdb/cockroach/issues/151493
+			if errors.Is(err, ErrMalformedLogEntry) {
+				continue
+			}
 			return nil, false, err
 		}
 		var match bool