fix: 修复多 backend 并行日志 PID 混乱并移除包装格式 (#74) (#76)

* fix(logger): 修复多 backend 并行日志 PID 混乱并移除包装格式

**问题：**
- logger.go:288 使用 os.Getpid() 导致并行任务日志 PID 混乱
- 日志文件添加时间戳/PID/级别前缀包装，应输出 backend 原始内容

**修复：**
1. Logger 结构体添加 pid 字段，创建时捕获 PID
2. 日志写入使用固定 l.pid 替代 os.Getpid()
3. 移除日志输出格式包装，直接写入原始消息
4. 添加内存缓存 ERROR/WARN 条目，ExtractRecentErrors 从缓存读取
5. 优化 executor.go context 初始化顺序，避免重复创建 logger

**测试：**
- 所有测试通过（23.7s）
- 更新相关测试用例匹配新格式

Closes #74

* fix(logger): 增强并发日志隔离和 task ID 清理

## 核心修复

### 1. Task ID Sanitization (logger.go)
- 新增 sanitizeLogSuffix(): 清理非法字符 (/, \, :, 等)
- 新增 fallbackLogSuffix(): 为空/非法 ID 生成唯一后备名
- 新增 isSafeLogRune(): 仅允许 [A-Za-z0-9._-]
- 路径穿越防护: ../../../etc/passwd → etc-passwd-{hash}.log
- 超长 ID 处理: 截断到 64 字符 + hash 确保唯一性
- 自动创建 TMPDIR (MkdirAll)

### 2. 共享日志标识 (executor.go)
- 新增 taskLoggerHandle 结构: 封装 logger、路径、共享标志
- 新增 newTaskLoggerHandle(): 统一处理 logger 创建和回退
- printTaskStart(): 显示 "Log (shared)" 标识
- generateFinalOutput(): 在 summary 中标记共享日志
- 并发失败时明确标识所有任务使用共享主日志

### 3. 内部标志 (config.go)
- TaskResult.sharedLog: 非导出字段，标识共享日志状态

### 4. Race Detector 修复 (logger.go:209-219)
- Close() 在关闭 channel 前先等待 pendingWG
- 消除 Logger.Close() 与 Logger.log() 之间的竞态条件

## 测试覆盖

### 新增测试 (logger_suffix_test.go)
- TestLoggerWithSuffixSanitizesUnsafeSuffix: 非法字符清理
- TestLoggerWithSuffixReturnsErrorWhenTempDirNotWritable: 只读目录处理

### 新增测试 (executor_concurrent_test.go)
- TestConcurrentTaskLoggerFailure: 多任务失败时共享日志标识
- TestSanitizeTaskID: 并发场景下 task ID 清理验证

## 验证结果

✅ 所有单元测试通过
✅ Race detector 无竞态 (65.4s)
✅ 路径穿越攻击防护
✅ 并发日志完全隔离
✅ 边界情况正确处理

Resolves: PR #76 review feedback
Co-Authored-By: Codex Review <codex@anthropic.ai>

Generated with swe-agent-bot

Co-Authored-By: swe-agent-bot <agent@swe-agent.ai>

* fix(logger): 修复关键 bug 并优化日志系统 (v5.2.5)

修复 P0 级别问题：
- sanitizeLogSuffix 的 trim 碰撞（防止多 task 日志文件名冲突）
- ExtractRecentErrors 边界检查（防止 slice 越界）
- Logger.Close 阻塞风险（新增可配置超时机制）

代码质量改进：
- 删除无用字段 Logger.pid 和 logEntry.level
- 优化 sharedLog 标记绑定到最终 LogPath
- 移除日志前缀，直接输出 backend 原始内容

测试覆盖增强：
- 新增 4 个测试用例（碰撞防护、边界检查、缓存上限、shared 判定）
- 优化测试注释和逻辑

版本更新：5.2.4 → 5.2.5

Generated with swe-agent-bot

Co-Authored-By: swe-agent-bot <agent@swe-agent.ai>

---------

Co-authored-by: swe-agent-bot <agent@swe-agent.ai>

codeagent-wrapper/concurrent_stress_test.go

@@ -76,8 +76,8 @@ func TestConcurrentStressLogger(t *testing.T) {
 	t.Logf("Successfully wrote %d/%d logs (%.1f%%)",
 		actualCount, totalExpected, float64(actualCount)/float64(totalExpected)*100)
 
-	// 验证日志格式
-	formatRE := regexp.MustCompile(`^\[\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3}\] \[PID:\d+\] INFO: goroutine-`)
+	// 验证日志格式（纯文本，无前缀）
+	formatRE := regexp.MustCompile(`^goroutine-\d+-msg-\d+$`)
 	for i, line := range lines[:min(10, len(lines))] {
 		if !formatRE.MatchString(line) {
 			t.Errorf("line %d has invalid format: %s", i, line)
@@ -293,16 +293,13 @@ func TestLoggerOrderPreservation(t *testing.T) {
 	for scanner.Scan() {
 		line := scanner.Text()
 		var gid, seq int
-		parts := strings.SplitN(line, " INFO: ", 2)
-		if len(parts) != 2 {
-			t.Errorf("invalid log format: %s", line)
+		// Parse format: G0-SEQ0001 (without INFO: prefix)
+		_, err := fmt.Sscanf(line, "G%d-SEQ%04d", &gid, &seq)
+		if err != nil {
+			t.Errorf("invalid log format: %s (error: %v)", line, err)
 			continue
 		}
-		if _, err := fmt.Sscanf(parts[1], "G%d-SEQ%d", &gid, &seq); err == nil {
 		sequences[gid] = append(sequences[gid], seq)
-		} else {
-			t.Errorf("failed to parse sequence from line: %s", line)
-		}
 	}
 
 	// 验证每个 goroutine 内部顺序

codeagent-wrapper/config.go

@@ -49,6 +49,7 @@ type TaskResult struct {
 	SessionID string `json:"session_id"`
 	Error     string `json:"error"`
 	LogPath   string `json:"log_path"`
+	sharedLog bool
 }
 
 var backendRegistry = map[string]Backend{

codeagent-wrapper/executor.go

@@ -139,6 +139,38 @@ func taskLoggerFromContext(ctx context.Context) *Logger {
 	return logger
 }
 
+type taskLoggerHandle struct {
+	logger  *Logger
+	path    string
+	shared  bool
+	closeFn func()
+}
+
+func newTaskLoggerHandle(taskID string) taskLoggerHandle {
+	taskLogger, err := NewLoggerWithSuffix(taskID)
+	if err == nil {
+		return taskLoggerHandle{
+			logger:  taskLogger,
+			path:    taskLogger.Path(),
+			closeFn: func() { _ = taskLogger.Close() },
+		}
+	}
+
+	msg := fmt.Sprintf("Failed to create task logger for %s: %v, using main logger", taskID, err)
+	mainLogger := activeLogger()
+	if mainLogger != nil {
+		logWarn(msg)
+		return taskLoggerHandle{
+			logger: mainLogger,
+			path:   mainLogger.Path(),
+			shared: true,
+		}
+	}
+
+	fmt.Fprintln(os.Stderr, msg)
+	return taskLoggerHandle{}
+}
+
 // defaultRunCodexTaskFn is the default implementation of runCodexTaskFn (exposed for test reset)
 func defaultRunCodexTaskFn(task TaskSpec, timeout int) TaskResult {
 	if task.WorkDir == "" {
@@ -255,7 +287,7 @@ func executeConcurrentWithContext(parentCtx context.Context, layers [][]TaskSpec
 	var startPrintMu sync.Mutex
 	bannerPrinted := false
 
-	printTaskStart := func(taskID, logPath string) {
+	printTaskStart := func(taskID, logPath string, shared bool) {
 		if logPath == "" {
 			return
 		}
@@ -264,7 +296,11 @@ func executeConcurrentWithContext(parentCtx context.Context, layers [][]TaskSpec
 			fmt.Fprintln(os.Stderr, "=== Starting Parallel Execution ===")
 			bannerPrinted = true
 		}
-		fmt.Fprintf(os.Stderr, "Task %s: Log: %s\n", taskID, logPath)
+		label := "Log"
+		if shared {
+			label = "Log (shared)"
+		}
+		fmt.Fprintf(os.Stderr, "Task %s: %s: %s\n", taskID, label, logPath)
 		startPrintMu.Unlock()
 	}
 
@@ -334,11 +370,11 @@ func executeConcurrentWithContext(parentCtx context.Context, layers [][]TaskSpec
 			wg.Add(1)
 			go func(ts TaskSpec) {
 				defer wg.Done()
-				var taskLogger *Logger
 				var taskLogPath string
+				handle := taskLoggerHandle{}
 				defer func() {
 					if r := recover(); r != nil {
-						resultsCh <- TaskResult{TaskID: ts.ID, ExitCode: 1, Error: fmt.Sprintf("panic: %v", r), LogPath: taskLogPath}
+						resultsCh <- TaskResult{TaskID: ts.ID, ExitCode: 1, Error: fmt.Sprintf("panic: %v", r), LogPath: taskLogPath, sharedLog: handle.shared}
 					}
 				}()
 
@@ -355,19 +391,30 @@ func executeConcurrentWithContext(parentCtx context.Context, layers [][]TaskSpec
 					logConcurrencyState("done", ts.ID, int(after), workerLimit)
 				}()
 
-				if l, err := NewLoggerWithSuffix(ts.ID); err == nil {
-					taskLogger = l
-					taskLogPath = l.Path()
-					defer func() { _ = taskLogger.Close() }()
+				handle = newTaskLoggerHandle(ts.ID)
+				taskLogPath = handle.path
+				if handle.closeFn != nil {
+					defer handle.closeFn()
 				}
 
-				ts.Context = withTaskLogger(ctx, taskLogger)
-				printTaskStart(ts.ID, taskLogPath)
+				taskCtx := ctx
+				if handle.logger != nil {
+					taskCtx = withTaskLogger(ctx, handle.logger)
+				}
+				ts.Context = taskCtx
+
+				printTaskStart(ts.ID, taskLogPath, handle.shared)
 
 				res := runCodexTaskFn(ts, timeout)
-				if res.LogPath == "" && taskLogPath != "" {
+				if taskLogPath != "" {
+					if res.LogPath == "" || (handle.shared && handle.logger != nil && res.LogPath == handle.logger.Path()) {
 						res.LogPath = taskLogPath
 					}
+				}
+				// 只有当最终的 LogPath 确实是共享 logger 的路径时才标记为 shared
+				if handle.shared && handle.logger != nil && res.LogPath == handle.logger.Path() {
+					res.sharedLog = true
+				}
 				resultsCh <- res
 			}(task)
 		}
@@ -444,8 +491,12 @@ func generateFinalOutput(results []TaskResult) string {
 			sb.WriteString(fmt.Sprintf("Session: %s\n", res.SessionID))
 		}
 		if res.LogPath != "" {
+			if res.sharedLog {
+				sb.WriteString(fmt.Sprintf("Log: %s (shared)\n", res.LogPath))
+			} else {
 				sb.WriteString(fmt.Sprintf("Log: %s\n", res.LogPath))
 			}
+		}
 		if res.Message != "" {
 			sb.WriteString(fmt.Sprintf("\n%s\n", res.Message))
 		}
@@ -485,6 +536,13 @@ func runCodexProcess(parentCtx context.Context, codexArgs []string, taskText str
 }
 
 func runCodexTaskWithContext(parentCtx context.Context, taskSpec TaskSpec, backend Backend, customArgs []string, useCustomArgs bool, silent bool, timeoutSec int) TaskResult {
+	if parentCtx == nil {
+		parentCtx = taskSpec.Context
+	}
+	if parentCtx == nil {
+		parentCtx = context.Background()
+	}
+
 	result := TaskResult{TaskID: taskSpec.ID}
 	injectedLogger := taskLoggerFromContext(parentCtx)
 	logger := injectedLogger
@@ -595,15 +653,15 @@ func runCodexTaskWithContext(parentCtx context.Context, taskSpec TaskSpec, backe
 	}
 
 	if !silent {
-		stdoutLogger = newLogWriter("CODEX_STDOUT: ", codexLogLineLimit)
-		stderrLogger = newLogWriter("CODEX_STDERR: ", codexLogLineLimit)
+		// Note: Empty prefix ensures backend output is logged as-is without any wrapper format.
+		// This preserves the original stdout/stderr content from codex/claude/gemini backends.
+		// Trade-off: Reduces distinguishability between stdout/stderr in logs, but maintains
+		// output fidelity which is critical for debugging backend-specific issues.
+		stdoutLogger = newLogWriter("", codexLogLineLimit)
+		stderrLogger = newLogWriter("", codexLogLineLimit)
 	}
 
 	ctx := parentCtx
-	if ctx == nil {
-		ctx = context.Background()
-	}
-
 	ctx, cancel := context.WithTimeout(ctx, time.Duration(timeoutSec)*time.Second)
 	defer cancel()
 	ctx, stop := signal.NotifyContext(ctx, syscall.SIGINT, syscall.SIGTERM)

codeagent-wrapper/executor_concurrent_test.go

@@ -472,6 +472,43 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {
 		}
 	})
 
+	t.Run("contextLoggerWithoutParent", func(t *testing.T) {
+		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+			return &execFakeRunner{
+				stdout:  newReasonReadCloser(`{"type":"item.completed","item":{"type":"agent_message","text":"ctx"}}`),
+				process: &execFakeProcess{pid: 14},
+			}
+		}
+		_ = closeLogger()
+
+		taskLogger, err := NewLoggerWithSuffix("executor-taskctx")
+		if err != nil {
+			t.Fatalf("NewLoggerWithSuffix() error = %v", err)
+		}
+		t.Cleanup(func() {
+			_ = taskLogger.Close()
+			_ = os.Remove(taskLogger.Path())
+		})
+
+		ctx := withTaskLogger(context.Background(), taskLogger)
+		res := runCodexTaskWithContext(nil, TaskSpec{ID: "task-context", Task: "payload", WorkDir: ".", Context: ctx}, nil, nil, false, true, 1)
+		if res.ExitCode != 0 || res.LogPath != taskLogger.Path() {
+			t.Fatalf("expected task logger to be reused from spec context, got %+v", res)
+		}
+		if activeLogger() != nil {
+			t.Fatalf("expected no global logger to be created when task context provides one")
+		}
+
+		taskLogger.Flush()
+		data, err := os.ReadFile(taskLogger.Path())
+		if err != nil {
+			t.Fatalf("failed to read task log: %v", err)
+		}
+		if !strings.Contains(string(data), "task-context") {
+			t.Fatalf("task log missing task id, content: %s", string(data))
+		}
+	})
+
 	t.Run("backendSetsDirAndNilContext", func(t *testing.T) {
 		var rc *execFakeRunner
 		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
@@ -974,6 +1011,143 @@ func TestExecutorExecuteConcurrentWithContextBranches(t *testing.T) {
 			t.Fatalf("unexpected results: %+v", results)
 		}
 	})
+
+	t.Run("TestConcurrentTaskLoggerFailure", func(t *testing.T) {
+		// Create a writable temp dir for the main logger, then flip TMPDIR to a read-only
+		// location so task-specific loggers fail to open.
+		writable := t.TempDir()
+		t.Setenv("TMPDIR", writable)
+
+		mainLogger, err := NewLoggerWithSuffix("shared-main")
+		if err != nil {
+			t.Fatalf("NewLoggerWithSuffix() error = %v", err)
+		}
+		setLogger(mainLogger)
+		t.Cleanup(func() {
+			mainLogger.Flush()
+			_ = closeLogger()
+			_ = os.Remove(mainLogger.Path())
+		})
+
+		noWrite := filepath.Join(writable, "ro")
+		if err := os.Mkdir(noWrite, 0o500); err != nil {
+			t.Fatalf("failed to create read-only temp dir: %v", err)
+		}
+		t.Setenv("TMPDIR", noWrite)
+
+		taskA := nextExecutorTestTaskID("shared-a")
+		taskB := nextExecutorTestTaskID("shared-b")
+
+		orig := runCodexTaskFn
+		runCodexTaskFn = func(task TaskSpec, timeout int) TaskResult {
+			logger := taskLoggerFromContext(task.Context)
+			if logger != mainLogger {
+				return TaskResult{TaskID: task.ID, ExitCode: 1, Error: "unexpected logger"}
+			}
+			logger.Info("TASK=" + task.ID)
+			return TaskResult{TaskID: task.ID, ExitCode: 0}
+		}
+		t.Cleanup(func() { runCodexTaskFn = orig })
+
+		stderrR, stderrW, err := os.Pipe()
+		if err != nil {
+			t.Fatalf("os.Pipe() error = %v", err)
+		}
+		oldStderr := os.Stderr
+		os.Stderr = stderrW
+
+		results := executeConcurrentWithContext(context.Background(), [][]TaskSpec{{{ID: taskA}, {ID: taskB}}}, 1, 0)
+
+		_ = stderrW.Close()
+		os.Stderr = oldStderr
+		stderrData, _ := io.ReadAll(stderrR)
+		_ = stderrR.Close()
+		stderrOut := string(stderrData)
+
+		if len(results) != 2 {
+			t.Fatalf("expected 2 results, got %d", len(results))
+		}
+		for _, res := range results {
+			if res.ExitCode != 0 || res.Error != "" {
+				t.Fatalf("task failed unexpectedly: %+v", res)
+			}
+			if res.LogPath != mainLogger.Path() {
+				t.Fatalf("shared log path mismatch: got %q want %q", res.LogPath, mainLogger.Path())
+			}
+			if !res.sharedLog {
+				t.Fatalf("expected sharedLog flag for %+v", res)
+			}
+			if !strings.Contains(stderrOut, "Log (shared)") {
+				t.Fatalf("stderr missing shared marker: %s", stderrOut)
+			}
+		}
+
+		summary := generateFinalOutput(results)
+		if !strings.Contains(summary, "(shared)") {
+			t.Fatalf("summary missing shared marker: %s", summary)
+		}
+
+		mainLogger.Flush()
+		data, err := os.ReadFile(mainLogger.Path())
+		if err != nil {
+			t.Fatalf("failed to read main log: %v", err)
+		}
+		content := string(data)
+		if !strings.Contains(content, "TASK="+taskA) || !strings.Contains(content, "TASK="+taskB) {
+			t.Fatalf("expected shared log to contain both tasks, got: %s", content)
+		}
+	})
+
+	t.Run("TestSanitizeTaskID", func(t *testing.T) {
+		tempDir := t.TempDir()
+		t.Setenv("TMPDIR", tempDir)
+
+		orig := runCodexTaskFn
+		runCodexTaskFn = func(task TaskSpec, timeout int) TaskResult {
+			logger := taskLoggerFromContext(task.Context)
+			if logger == nil {
+				return TaskResult{TaskID: task.ID, ExitCode: 1, Error: "missing logger"}
+			}
+			logger.Info("TASK=" + task.ID)
+			return TaskResult{TaskID: task.ID, ExitCode: 0}
+		}
+		t.Cleanup(func() { runCodexTaskFn = orig })
+
+		idA := "../bad id"
+		idB := "tab\tid"
+		results := executeConcurrentWithContext(context.Background(), [][]TaskSpec{{{ID: idA}, {ID: idB}}}, 1, 0)
+
+		if len(results) != 2 {
+			t.Fatalf("expected 2 results, got %d", len(results))
+		}
+
+		expected := map[string]string{
+			idA: sanitizeLogSuffix(idA),
+			idB: sanitizeLogSuffix(idB),
+		}
+
+		for _, res := range results {
+			if res.ExitCode != 0 || res.Error != "" {
+				t.Fatalf("unexpected failure: %+v", res)
+			}
+			safe, ok := expected[res.TaskID]
+			if !ok {
+				t.Fatalf("unexpected task id %q in results", res.TaskID)
+			}
+			wantBase := fmt.Sprintf("%s-%d-%s.log", primaryLogPrefix(), os.Getpid(), safe)
+			if filepath.Base(res.LogPath) != wantBase {
+				t.Fatalf("log filename for %q = %q, want %q", res.TaskID, filepath.Base(res.LogPath), wantBase)
+			}
+			data, err := os.ReadFile(res.LogPath)
+			if err != nil {
+				t.Fatalf("failed to read log %q: %v", res.LogPath, err)
+			}
+			if !strings.Contains(string(data), "TASK="+res.TaskID) {
+				t.Fatalf("log for %q missing task marker, content: %s", res.TaskID, string(data))
+			}
+			_ = os.Remove(res.LogPath)
+		}
+	})
 }
 
 func TestExecutorSignalAndTermination(t *testing.T) {
@@ -1116,3 +1290,70 @@ func TestExecutorForwardSignalsDefaults(t *testing.T) {
 	forwardSignals(ctx, &execFakeRunner{process: &execFakeProcess{pid: 80}}, func(string) {})
 	time.Sleep(10 * time.Millisecond)
 }
+
+func TestExecutorSharedLogFalseWhenCustomLogPath(t *testing.T) {
+	devNull, err := os.OpenFile(os.DevNull, os.O_WRONLY, 0)
+	if err != nil {
+		t.Fatalf("failed to open %s: %v", os.DevNull, err)
+	}
+	oldStderr := os.Stderr
+	os.Stderr = devNull
+	t.Cleanup(func() {
+		os.Stderr = oldStderr
+		_ = devNull.Close()
+	})
+
+	tempDir := t.TempDir()
+	t.Setenv("TMPDIR", tempDir)
+
+	// Setup: 创建主 logger
+	mainLogger, err := NewLoggerWithSuffix("shared-main")
+	if err != nil {
+		t.Fatalf("NewLoggerWithSuffix() error = %v", err)
+	}
+	setLogger(mainLogger)
+	defer func() {
+		_ = closeLogger()
+		_ = os.Remove(mainLogger.Path())
+	}()
+
+	// 模拟场景：task logger 创建失败（通过设置只读的 TMPDIR），
+	// 回退到主 logger（handle.shared=true），
+	// 但 runCodexTaskFn 返回自定义的 LogPath（不等于主 logger 的路径）
+	roDir := filepath.Join(tempDir, "ro")
+	if err := os.Mkdir(roDir, 0o500); err != nil {
+		t.Fatalf("failed to create read-only dir: %v", err)
+	}
+	t.Setenv("TMPDIR", roDir)
+
+	orig := runCodexTaskFn
+	customLogPath := "/custom/path/to.log"
+	runCodexTaskFn = func(task TaskSpec, timeout int) TaskResult {
+		// 返回自定义 LogPath，不等于主 logger 的路径
+		return TaskResult{
+			TaskID:   task.ID,
+			ExitCode: 0,
+			LogPath:  customLogPath,
+		}
+	}
+	defer func() { runCodexTaskFn = orig }()
+
+	// 执行任务
+	results := executeConcurrentWithContext(context.Background(), [][]TaskSpec{{{ID: "task1"}}}, 1, 0)
+
+	if len(results) != 1 {
+		t.Fatalf("expected 1 result, got %d", len(results))
+	}
+
+	res := results[0]
+	// 关键断言：即使 handle.shared=true（因为 task logger 创建失败），
+	// 但因为 LogPath 不等于主 logger 的路径，sharedLog 应为 false
+	if res.sharedLog {
+		t.Fatalf("expected sharedLog=false when LogPath differs from shared logger, got true")
+	}
+
+	// 验证 LogPath 确实是自定义的
+	if res.LogPath != customLogPath {
+		t.Fatalf("expected custom LogPath %s, got %s", customLogPath, res.LogPath)
+	}
+}

codeagent-wrapper/logger.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"hash/crc32"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -29,11 +30,14 @@ type Logger struct {
 	workerWG     sync.WaitGroup
 	pendingWG    sync.WaitGroup
 	flushMu      sync.Mutex
+	workerErr    error
+	errorEntries []string // Cache of recent ERROR/WARN entries
+	errorMu      sync.Mutex
 }
 
 type logEntry struct {
-	level string
 	msg     string
+	isError bool // true for ERROR or WARN levels
 }
 
 // CleanupStats captures the outcome of a cleanupOldLogs run.
@@ -55,6 +59,10 @@ var (
 	evalSymlinksFn      = filepath.EvalSymlinks
 )
 
+const maxLogSuffixLen = 64
+
+var logSuffixCounter atomic.Uint64
+
 // NewLogger creates the async logger and starts the worker goroutine.
 // The log file is created under os.TempDir() using the required naming scheme.
 func NewLogger() (*Logger, error) {
@@ -64,14 +72,23 @@ func NewLogger() (*Logger, error) {
 // NewLoggerWithSuffix creates a logger with an optional suffix in the filename.
 // Useful for tests that need isolated log files within the same process.
 func NewLoggerWithSuffix(suffix string) (*Logger, error) {
-	filename := fmt.Sprintf("%s-%d", primaryLogPrefix(), os.Getpid())
+	pid := os.Getpid()
+	filename := fmt.Sprintf("%s-%d", primaryLogPrefix(), pid)
+	var safeSuffix string
 	if suffix != "" {
-		filename += "-" + suffix
+		safeSuffix = sanitizeLogSuffix(suffix)
+	}
+	if safeSuffix != "" {
+		filename += "-" + safeSuffix
 	}
 	filename += ".log"
 
 	path := filepath.Clean(filepath.Join(os.TempDir(), filename))
 
+	if err := os.MkdirAll(filepath.Dir(path), 0o700); err != nil {
+		return nil, err
+	}
+
 	f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0o600)
 	if err != nil {
 		return nil, err
@@ -92,6 +109,73 @@ func NewLoggerWithSuffix(suffix string) (*Logger, error) {
 	return l, nil
 }
 
+func sanitizeLogSuffix(raw string) string {
+	trimmed := strings.TrimSpace(raw)
+	if trimmed == "" {
+		return fallbackLogSuffix()
+	}
+
+	var b strings.Builder
+	changed := false
+	for _, r := range trimmed {
+		if isSafeLogRune(r) {
+			b.WriteRune(r)
+		} else {
+			changed = true
+			b.WriteByte('-')
+		}
+		if b.Len() >= maxLogSuffixLen {
+			changed = true
+			break
+		}
+	}
+
+	sanitized := strings.Trim(b.String(), "-.")
+	if sanitized != b.String() {
+		changed = true // Mark if trim removed any characters
+	}
+	if sanitized == "" {
+		return fallbackLogSuffix()
+	}
+
+	if changed || len(sanitized) > maxLogSuffixLen {
+		hash := crc32.ChecksumIEEE([]byte(trimmed))
+		hashStr := fmt.Sprintf("%x", hash)
+
+		maxPrefix := maxLogSuffixLen - len(hashStr) - 1
+		if maxPrefix < 1 {
+			maxPrefix = 1
+		}
+		if len(sanitized) > maxPrefix {
+			sanitized = sanitized[:maxPrefix]
+		}
+
+		sanitized = fmt.Sprintf("%s-%s", sanitized, hashStr)
+	}
+
+	return sanitized
+}
+
+func fallbackLogSuffix() string {
+	next := logSuffixCounter.Add(1)
+	return fmt.Sprintf("task-%d", next)
+}
+
+func isSafeLogRune(r rune) bool {
+	switch {
+	case r >= 'a' && r <= 'z':
+		return true
+	case r >= 'A' && r <= 'Z':
+		return true
+	case r >= '0' && r <= '9':
+		return true
+	case r == '-', r == '_', r == '.':
+		return true
+	default:
+		return false
+	}
+}
+
 // Path returns the underlying log file path (useful for tests/inspection).
 func (l *Logger) Path() string {
 	if l == nil {
@@ -112,10 +196,11 @@ func (l *Logger) Debug(msg string) { l.log("DEBUG", msg) }
 // Error logs at ERROR level.
 func (l *Logger) Error(msg string) { l.log("ERROR", msg) }
 
-// Close stops the worker and syncs the log file.
+// Close signals the worker to flush and close the log file.
 // The log file is NOT removed, allowing inspection after program exit.
 // It is safe to call multiple times.
-// Returns after a 5-second timeout if worker doesn't stop gracefully.
+// Waits up to CODEAGENT_LOGGER_CLOSE_TIMEOUT_MS (default: 5000) for shutdown; set to 0 to wait indefinitely.
+// Returns an error if shutdown doesn't complete within the timeout.
 func (l *Logger) Close() error {
 	if l == nil {
 		return nil
@@ -126,42 +211,51 @@ func (l *Logger) Close() error {
 	l.closeOnce.Do(func() {
 		l.closed.Store(true)
 		close(l.done)
-		close(l.ch)
 
-		// Wait for worker with timeout
+		timeout := loggerCloseTimeout()
 		workerDone := make(chan struct{})
 		go func() {
 			l.workerWG.Wait()
 			close(workerDone)
 		}()
 
+		if timeout > 0 {
 			select {
 			case <-workerDone:
 				// Worker stopped gracefully
-		case <-time.After(5 * time.Second):
-			// Worker timeout - proceed with cleanup anyway
+			case <-time.After(timeout):
 				closeErr = fmt.Errorf("logger worker timeout during close")
+				return
+			}
+		} else {
+			<-workerDone
 		}
 
-		if err := l.writer.Flush(); err != nil && closeErr == nil {
-			closeErr = err
+		if l.workerErr != nil && closeErr == nil {
+			closeErr = l.workerErr
 		}
-
-		if err := l.file.Sync(); err != nil && closeErr == nil {
-			closeErr = err
-		}
-
-		if err := l.file.Close(); err != nil && closeErr == nil {
-			closeErr = err
-		}
-
-		// Log file is kept for debugging - NOT removed
-		// Users can manually clean up /tmp/<wrapper>-*.log files
 	})
 
 	return closeErr
 }
 
+func loggerCloseTimeout() time.Duration {
+	const defaultTimeout = 5 * time.Second
+
+	raw := strings.TrimSpace(os.Getenv("CODEAGENT_LOGGER_CLOSE_TIMEOUT_MS"))
+	if raw == "" {
+		return defaultTimeout
+	}
+	ms, err := strconv.Atoi(raw)
+	if err != nil {
+		return defaultTimeout
+	}
+	if ms <= 0 {
+		return 0
+	}
+	return time.Duration(ms) * time.Millisecond
+}
+
 // RemoveLogFile removes the log file. Should only be called after Close().
 func (l *Logger) RemoveLogFile() error {
 	if l == nil {
@@ -170,34 +264,29 @@ func (l *Logger) RemoveLogFile() error {
 	return os.Remove(l.path)
 }
 
-// ExtractRecentErrors reads the log file and returns the most recent ERROR and WARN entries.
+// ExtractRecentErrors returns the most recent ERROR and WARN entries from memory cache.
 // Returns up to maxEntries entries in chronological order.
 func (l *Logger) ExtractRecentErrors(maxEntries int) []string {
-	if l == nil || l.path == "" {
+	if l == nil || maxEntries <= 0 {
 		return nil
 	}
 
-	f, err := os.Open(l.path)
-	if err != nil {
+	l.errorMu.Lock()
+	defer l.errorMu.Unlock()
+
+	if len(l.errorEntries) == 0 {
 		return nil
 	}
-	defer f.Close()
 
-	var entries []string
-	scanner := bufio.NewScanner(f)
-	for scanner.Scan() {
-		line := scanner.Text()
-		if strings.Contains(line, "] ERROR:") || strings.Contains(line, "] WARN:") {
-			entries = append(entries, line)
-		}
+	// Return last N entries
+	start := 0
+	if len(l.errorEntries) > maxEntries {
+		start = len(l.errorEntries) - maxEntries
 	}
 
-	// Keep only the last maxEntries
-	if len(entries) > maxEntries {
-		entries = entries[len(entries)-maxEntries:]
-	}
-
-	return entries
+	result := make([]string, len(l.errorEntries)-start)
+	copy(result, l.errorEntries[start:])
+	return result
 }
 
 // Flush waits for all pending log entries to be written. Primarily for tests.
@@ -254,7 +343,8 @@ func (l *Logger) log(level, msg string) {
 		return
 	}
 
-	entry := logEntry{level: level, msg: msg}
+	isError := level == "WARN" || level == "ERROR"
+	entry := logEntry{msg: msg, isError: isError}
 	l.flushMu.Lock()
 	l.pendingWG.Add(1)
 	l.flushMu.Unlock()
@@ -275,18 +365,42 @@ func (l *Logger) run() {
 	ticker := time.NewTicker(500 * time.Millisecond)
 	defer ticker.Stop()
 
+	writeEntry := func(entry logEntry) {
+		fmt.Fprintf(l.writer, "%s\n", entry.msg)
+
+		// Cache error/warn entries in memory for fast extraction
+		if entry.isError {
+			l.errorMu.Lock()
+			l.errorEntries = append(l.errorEntries, entry.msg)
+			if len(l.errorEntries) > 100 { // Keep last 100
+				l.errorEntries = l.errorEntries[1:]
+			}
+			l.errorMu.Unlock()
+		}
+
+		l.pendingWG.Done()
+	}
+
+	finalize := func() {
+		if err := l.writer.Flush(); err != nil && l.workerErr == nil {
+			l.workerErr = err
+		}
+		if err := l.file.Sync(); err != nil && l.workerErr == nil {
+			l.workerErr = err
+		}
+		if err := l.file.Close(); err != nil && l.workerErr == nil {
+			l.workerErr = err
+		}
+	}
+
 	for {
 		select {
 		case entry, ok := <-l.ch:
 			if !ok {
-				// Channel closed, final flush
-				_ = l.writer.Flush()
+				finalize()
 				return
 			}
-			timestamp := time.Now().Format("2006-01-02 15:04:05.000")
-			pid := os.Getpid()
-			fmt.Fprintf(l.writer, "[%s] [PID:%d] %s: %s\n", timestamp, pid, entry.level, entry.msg)
-			l.pendingWG.Done()
+			writeEntry(entry)
 
 		case <-ticker.C:
 			_ = l.writer.Flush()
@@ -296,6 +410,21 @@ func (l *Logger) run() {
 			_ = l.writer.Flush()
 			_ = l.file.Sync()
 			close(flushDone)
+
+		case <-l.done:
+			for {
+				select {
+				case entry, ok := <-l.ch:
+					if !ok {
+						finalize()
+						return
+					}
+					writeEntry(entry)
+				default:
+					finalize()
+					return
+				}
+			}
 		}
 	}
 }

codeagent-wrapper/logger_suffix_test.go

@@ -68,13 +68,48 @@ func TestLoggerWithSuffixNamingAndIsolation(t *testing.T) {
 	}
 }
 
-func TestLoggerWithSuffixReturnsErrorWhenTempDirMissing(t *testing.T) {
-	missingTempDir := filepath.Join(t.TempDir(), "does-not-exist")
-	setTempDirEnv(t, missingTempDir)
+func TestLoggerWithSuffixReturnsErrorWhenTempDirNotWritable(t *testing.T) {
+	base := t.TempDir()
+	noWrite := filepath.Join(base, "ro")
+	if err := os.Mkdir(noWrite, 0o500); err != nil {
+		t.Fatalf("failed to create read-only temp dir: %v", err)
+	}
+	t.Cleanup(func() { _ = os.Chmod(noWrite, 0o700) })
+	setTempDirEnv(t, noWrite)
 
 	logger, err := NewLoggerWithSuffix("task-err")
 	if err == nil {
 		_ = logger.Close()
-		t.Fatalf("expected error, got nil")
+		t.Fatalf("expected error when temp dir is not writable")
+	}
+}
+
+func TestLoggerWithSuffixSanitizesUnsafeSuffix(t *testing.T) {
+	tempDir := setTempDirEnv(t, t.TempDir())
+
+	raw := "../bad id/with?chars"
+	safe := sanitizeLogSuffix(raw)
+	if safe == "" {
+		t.Fatalf("sanitizeLogSuffix returned empty string")
+	}
+	if strings.ContainsAny(safe, "/\\") {
+		t.Fatalf("sanitized suffix should not contain path separators, got %q", safe)
+	}
+
+	logger, err := NewLoggerWithSuffix(raw)
+	if err != nil {
+		t.Fatalf("NewLoggerWithSuffix(%q) error = %v", raw, err)
+	}
+	t.Cleanup(func() {
+		_ = logger.Close()
+		_ = os.Remove(logger.Path())
+	})
+
+	wantBase := fmt.Sprintf("%s-%d-%s.log", primaryLogPrefix(), os.Getpid(), safe)
+	if gotBase := filepath.Base(logger.Path()); gotBase != wantBase {
+		t.Fatalf("log filename = %q, want %q", gotBase, wantBase)
+	}
+	if dir := filepath.Dir(logger.Path()); dir != tempDir {
+		t.Fatalf("logger path dir = %q, want %q", dir, tempDir)
 	}
 }

codeagent-wrapper/logger_test.go

@@ -69,7 +69,7 @@ func TestLoggerWritesLevels(t *testing.T) {
 	}
 
 	content := string(data)
-	checks := []string{"INFO: info message", "WARN: warn message", "DEBUG: debug message", "ERROR: error message"}
+	checks := []string{"info message", "warn message", "debug message", "error message"}
 	for _, c := range checks {
 		if !strings.Contains(content, c) {
 			t.Fatalf("log file missing entry %q, content: %s", c, content)
@@ -766,7 +766,7 @@ func TestLoggerInternalLog(t *testing.T) {
 
 	logger.log("INFO", "hello")
 	entry := <-done
-	if entry.level != "INFO" || entry.msg != "hello" {
+	if entry.msg != "hello" {
 		t.Fatalf("unexpected entry %+v", entry)
 	}
 
@@ -894,66 +894,90 @@ func (f fakeFileInfo) Sys() interface{}   { return nil }
 func TestLoggerExtractRecentErrors(t *testing.T) {
 	tests := []struct {
 		name       string
-		content    string
+		logs       []struct{ level, msg string }
 		maxEntries int
 		want       []string
 	}{
 		{
 			name:       "empty log",
-			content:    "",
+			logs:       nil,
 			maxEntries: 10,
 			want:       nil,
 		},
 		{
 			name: "no errors",
-			content: `[2025-01-01 12:00:00.000] [PID:123] INFO: started
-[2025-01-01 12:00:01.000] [PID:123] DEBUG: processing`,
+			logs: []struct{ level, msg string }{
+				{"INFO", "started"},
+				{"DEBUG", "processing"},
+			},
 			maxEntries: 10,
 			want:       nil,
 		},
 		{
 			name: "single error",
-			content: `[2025-01-01 12:00:00.000] [PID:123] INFO: started
-[2025-01-01 12:00:01.000] [PID:123] ERROR: something failed`,
+			logs: []struct{ level, msg string }{
+				{"INFO", "started"},
+				{"ERROR", "something failed"},
+			},
 			maxEntries: 10,
-			want:       []string{"[2025-01-01 12:00:01.000] [PID:123] ERROR: something failed"},
+			want:       []string{"something failed"},
 		},
 		{
 			name: "error and warn",
-			content: `[2025-01-01 12:00:00.000] [PID:123] INFO: started
-[2025-01-01 12:00:01.000] [PID:123] WARN: warning message
-[2025-01-01 12:00:02.000] [PID:123] ERROR: error message`,
+			logs: []struct{ level, msg string }{
+				{"INFO", "started"},
+				{"WARN", "warning message"},
+				{"ERROR", "error message"},
+			},
 			maxEntries: 10,
 			want: []string{
-				"[2025-01-01 12:00:01.000] [PID:123] WARN: warning message",
-				"[2025-01-01 12:00:02.000] [PID:123] ERROR: error message",
+				"warning message",
+				"error message",
 			},
 		},
 		{
 			name: "truncate to max",
-			content: `[2025-01-01 12:00:00.000] [PID:123] ERROR: error 1
-[2025-01-01 12:00:01.000] [PID:123] ERROR: error 2
-[2025-01-01 12:00:02.000] [PID:123] ERROR: error 3
-[2025-01-01 12:00:03.000] [PID:123] ERROR: error 4
-[2025-01-01 12:00:04.000] [PID:123] ERROR: error 5`,
+			logs: []struct{ level, msg string }{
+				{"ERROR", "error 1"},
+				{"ERROR", "error 2"},
+				{"ERROR", "error 3"},
+				{"ERROR", "error 4"},
+				{"ERROR", "error 5"},
+			},
 			maxEntries: 3,
 			want: []string{
-				"[2025-01-01 12:00:02.000] [PID:123] ERROR: error 3",
-				"[2025-01-01 12:00:03.000] [PID:123] ERROR: error 4",
-				"[2025-01-01 12:00:04.000] [PID:123] ERROR: error 5",
+				"error 3",
+				"error 4",
+				"error 5",
 			},
 		},
 	}
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			tempDir := t.TempDir()
-			logPath := filepath.Join(tempDir, "test.log")
-			if err := os.WriteFile(logPath, []byte(tt.content), 0o644); err != nil {
-				t.Fatalf("failed to write test log: %v", err)
+			logger, err := NewLoggerWithSuffix("extract-test")
+			if err != nil {
+				t.Fatalf("NewLoggerWithSuffix() error = %v", err)
+			}
+			defer logger.Close()
+			defer logger.RemoveLogFile()
+
+			// Write logs using logger methods
+			for _, entry := range tt.logs {
+				switch entry.level {
+				case "INFO":
+					logger.Info(entry.msg)
+				case "WARN":
+					logger.Warn(entry.msg)
+				case "ERROR":
+					logger.Error(entry.msg)
+				case "DEBUG":
+					logger.Debug(entry.msg)
+				}
 			}
 
-			logger := &Logger{path: logPath}
+			logger.Flush()
+
 			got := logger.ExtractRecentErrors(tt.maxEntries)
 
 			if len(got) != len(tt.want) {
@@ -988,3 +1012,117 @@ func TestLoggerExtractRecentErrorsFileNotExist(t *testing.T) {
 		t.Fatalf("nonexistent file ExtractRecentErrors() should return nil, got %v", got)
 	}
 }
+
+func TestSanitizeLogSuffixNoDuplicates(t *testing.T) {
+	testCases := []string{
+		"task",
+		"task.",
+		".task",
+		"-task",
+		"task-",
+		"--task--",
+		"..task..",
+	}
+
+	seen := make(map[string]string)
+	for _, input := range testCases {
+		result := sanitizeLogSuffix(input)
+		if result == "" {
+			t.Fatalf("sanitizeLogSuffix(%q) returned empty string", input)
+		}
+
+		if prev, exists := seen[result]; exists {
+			t.Fatalf("collision detected: %q and %q both produce %q", input, prev, result)
+		}
+		seen[result] = input
+
+		// Verify result is safe for file names
+		if strings.ContainsAny(result, "/\\:*?\"<>|") {
+			t.Fatalf("sanitizeLogSuffix(%q) = %q contains unsafe characters", input, result)
+		}
+	}
+}
+
+func TestExtractRecentErrorsBoundaryCheck(t *testing.T) {
+	logger, err := NewLoggerWithSuffix("boundary-test")
+	if err != nil {
+		t.Fatalf("NewLoggerWithSuffix() error = %v", err)
+	}
+	defer logger.Close()
+	defer logger.RemoveLogFile()
+
+	// Write some errors
+	logger.Error("error 1")
+	logger.Warn("warn 1")
+	logger.Error("error 2")
+	logger.Flush()
+
+	// Test zero
+	result := logger.ExtractRecentErrors(0)
+	if result != nil {
+		t.Fatalf("ExtractRecentErrors(0) should return nil, got %v", result)
+	}
+
+	// Test negative
+	result = logger.ExtractRecentErrors(-5)
+	if result != nil {
+		t.Fatalf("ExtractRecentErrors(-5) should return nil, got %v", result)
+	}
+
+	// Test positive still works
+	result = logger.ExtractRecentErrors(10)
+	if len(result) != 3 {
+		t.Fatalf("ExtractRecentErrors(10) expected 3 entries, got %d", len(result))
+	}
+}
+
+func TestErrorEntriesMaxLimit(t *testing.T) {
+	logger, err := NewLoggerWithSuffix("max-limit-test")
+	if err != nil {
+		t.Fatalf("NewLoggerWithSuffix() error = %v", err)
+	}
+	defer logger.Close()
+	defer logger.RemoveLogFile()
+
+	// Write 150 error/warn entries
+	for i := 1; i <= 150; i++ {
+		if i%2 == 0 {
+			logger.Error(fmt.Sprintf("error-%03d", i))
+		} else {
+			logger.Warn(fmt.Sprintf("warn-%03d", i))
+		}
+	}
+	logger.Flush()
+
+	// Extract all cached errors
+	result := logger.ExtractRecentErrors(200) // Request more than cache size
+
+	// Should only have last 100 entries (entries 51-150 in sequence)
+	if len(result) != 100 {
+		t.Fatalf("expected 100 cached entries, got %d", len(result))
+	}
+
+	// Verify entries are the last 100 (entries 51-150)
+	if !strings.Contains(result[0], "051") {
+		t.Fatalf("first cached entry should be entry 51, got: %s", result[0])
+	}
+	if !strings.Contains(result[99], "150") {
+		t.Fatalf("last cached entry should be entry 150, got: %s", result[99])
+	}
+
+	// Verify order is preserved - simplified logic
+	for i := 0; i < len(result)-1; i++ {
+		expectedNum := 51 + i
+		nextNum := 51 + i + 1
+
+		expectedEntry := fmt.Sprintf("%03d", expectedNum)
+		nextEntry := fmt.Sprintf("%03d", nextNum)
+
+		if !strings.Contains(result[i], expectedEntry) {
+			t.Fatalf("entry at index %d should contain %s, got: %s", i, expectedEntry, result[i])
+		}
+		if !strings.Contains(result[i+1], nextEntry) {
+			t.Fatalf("entry at index %d should contain %s, got: %s", i+1, nextEntry, result[i+1])
+		}
+	}
+}

codeagent-wrapper/main.go

@@ -14,7 +14,7 @@ import (
 )
 
 const (
-	version             = "5.2.4"
+	version             = "5.2.5"
 	defaultWorkdir      = "."
 	defaultTimeout      = 7200 // seconds
 	codexLogLineLimit   = 1000

codeagent-wrapper/main_test.go

@@ -1784,13 +1784,13 @@ func TestRunLogFunctions(t *testing.T) {
 	}
 
 	output := string(data)
-	if !strings.Contains(output, "INFO: info message") {
+	if !strings.Contains(output, "info message") {
 		t.Errorf("logInfo output missing, got: %s", output)
 	}
-	if !strings.Contains(output, "WARN: warn message") {
+	if !strings.Contains(output, "warn message") {
 		t.Errorf("logWarn output missing, got: %s", output)
 	}
-	if !strings.Contains(output, "ERROR: error message") {
+	if !strings.Contains(output, "error message") {
 		t.Errorf("logError output missing, got: %s", output)
 	}
 }
@@ -2691,7 +2691,7 @@ func TestVersionFlag(t *testing.T) {
 			t.Errorf("exit = %d, want 0", code)
 		}
 	})
-	want := "codeagent-wrapper version 5.2.4\n"
+	want := "codeagent-wrapper version 5.2.5\n"
 	if output != want {
 		t.Fatalf("output = %q, want %q", output, want)
 	}
@@ -2705,7 +2705,7 @@ func TestVersionShortFlag(t *testing.T) {
 			t.Errorf("exit = %d, want 0", code)
 		}
 	})
-	want := "codeagent-wrapper version 5.2.4\n"
+	want := "codeagent-wrapper version 5.2.5\n"
 	if output != want {
 		t.Fatalf("output = %q, want %q", output, want)
 	}
@@ -2719,7 +2719,7 @@ func TestVersionLegacyAlias(t *testing.T) {
 			t.Errorf("exit = %d, want 0", code)
 		}
 	})
-	want := "codex-wrapper version 5.2.4\n"
+	want := "codex-wrapper version 5.2.5\n"
 	if output != want {
 		t.Fatalf("output = %q, want %q", output, want)
 	}
@@ -3300,7 +3300,7 @@ func TestRun_PipedTaskReadError(t *testing.T) {
 	if exitCode != 1 {
 		t.Fatalf("exit=%d, want 1", exitCode)
 	}
-	if !strings.Contains(logOutput, "ERROR: Failed to read piped stdin: read stdin: pipe failure") {
+	if !strings.Contains(logOutput, "Failed to read piped stdin: read stdin: pipe failure") {
 		t.Fatalf("log missing piped read error, got %q", logOutput)
 	}
 	// Log file is always removed after completion (new behavior)