Merge pull request #57 from JetBrains-Research/kudashev/crash-deduplication-fix

Casr bug fix and deduplication on initialisation

Author: AbdullinAM

kotlinx.fuzz.jazzer/src/main/kotlin/kotlinx/fuzz/jazzer/JazzerEngine.kt

@@ -42,6 +42,34 @@ class JazzerEngine(private val config: KFuzzConfig) : KFuzzEngine {
         config.corpusDir.createDirectories()
         config.logsDir.createDirectories()
         config.exceptionsDir.createDirectories()
+        config.global.reproducerDir.createDirectories()
+        initialCrashDeduplication()
+    }
+
+    private fun initialCrashDeduplication() {
+        config.global.reproducerDir.listDirectoryEntries()
+            .filter { it.isDirectory() }
+            .forEach {classDir ->
+                classDir.listDirectoryEntries()
+                    .filter { it.isDirectory() }
+                    .forEach { methodDir ->
+                        flatten(methodDir)
+                        JazzerLauncher.clusterCrashes(methodDir)
+                    }
+            }
+        clusterCrashes()
+    }
+
+    @OptIn(ExperimentalPathApi::class)
+    private fun flatten(dir: Path) {
+        Files.walk(dir).filter { it.isRegularFile() }.forEach {
+            val targetFile = dir.resolve(it.name)
+            if (targetFile.exists()) {
+                return@forEach
+            }
+            it.copyTo(targetFile)
+        }
+        dir.listDirectoryEntries().filter { it.isDirectory() }.forEach { it.deleteRecursively() }
     }
 
     private fun getDebugSetup(intellijDebuggerDispatchPort: Int, method: Method): List<String> {
@@ -78,6 +106,7 @@ class JazzerEngine(private val config: KFuzzConfig) : KFuzzEngine {
 
         val exitCode = ProcessBuilder(
             javaCommand,
+            "-XX:-OmitStackTraceInFastThrow",
             "-classpath", classpath,
             *debugOptions.toTypedArray(),
             *propertiesList.toTypedArray(),

kotlinx.fuzz.jazzer/src/main/kotlin/kotlinx/fuzz/jazzer/JazzerLauncher.kt

@@ -179,7 +179,7 @@ object JazzerLauncher {
         return mapping
     }
 
-    private fun clusterCrashes(directoryPath: Path): Int {
+    fun clusterCrashes(directoryPath: Path): Int {
         val stacktraceFiles = directoryPath.listStacktraces()
 
         val rawStackTraces = mutableListOf<String>()