diff --git a/src/modules/dock/processinfo.cpp b/src/modules/dock/processinfo.cpp
index fd371cd..625be37 100644
--- a/src/modules/dock/processinfo.cpp
+++ b/src/modules/dock/processinfo.cpp
@@ -24,26 +24,36 @@
 
 #include <QFileInfo>
 #include <QDir>
+#include <QDebug>
 
 ProcessInfo::ProcessInfo(int pid)
- : hasPid(true)
- , process(Process(pid))
+    : m_hasPid(true)
+    , m_process(Process(pid))
+    , m_isValid(true)
 {
     if (pid == 0)
         return;
 
     // exe
-    exe = process.getExe();
+    m_exe = m_process.getExe();
     // cwd
-    cwd = process.getCwd();
+    m_cwd = m_process.getCwd();
     // cmdline
-    cmdLine = process.getCmdLine();
-    // ppid
-    Status pstatus = process.getStatus();
-    if (pstatus.size() > 0) {
-        int ppid = process.getPpid();
+    m_cmdLine = m_process.getCmdLine();
+    // 部分root进程在/proc文件系统查找不到exe、cwd、cmdline信息
+    if (m_exe.empty() || m_cwd.empty() || m_cmdLine.size() == 0) {
+        m_isValid = false;
+        return;
     }
+
+    // ppid
+    Status pstatus = m_process.getStatus();
+    if (pstatus.size() > 0) {
+        int ppid = m_process.getPpid();
+    }
+
     // args
+    qInfo() << "ProcessInfo: exe=" << m_exe.c_str() << " cwd=" << m_cwd.c_str() << " cmdLine=" << (m_cmdLine[0].empty() ? " " : m_cmdLine[0].c_str());
     auto verifyExe =  [](std::string exe, std::string cwd, std::string firstArg){
         if (firstArg.size() == 0)
             return false;
@@ -57,91 +67,102 @@ ProcessInfo::ProcessInfo(int pid)
 
         return exe == firstArg;
     };
-    if (!verifyExe(exe, cwd, cmdLine[0])) {
-        auto parts = DString::splitStr(cmdLine[0], ' ');
-        // try again
-        if (verifyExe(exe, cwd, parts[0])) {
-            for (int j = 1; j < parts.size(); j++) {
-                args.push_back(parts[j]);
+
+    if (!m_cmdLine[0].empty()) {
+        if (!verifyExe(m_exe, m_cwd, m_cmdLine[0])) {
+            auto parts = DString::splitStr(m_cmdLine[0], ' ');
+            // try again
+            if (verifyExe(m_exe, m_cwd, parts[0])) {
+                for (int j = 1; j < parts.size(); j++) {
+                    m_args.push_back(parts[j]);
+                }
+                for (int i = 1; i < m_cmdLine.size(); i++) {
+                    m_args.push_back(m_cmdLine[i]);
+                }
             }
-            for (int i = 1; i < cmdLine.size(); i++) {
-                args.push_back(cmdLine[i]);
+        } else {
+            for (int i = 1; i < m_cmdLine.size(); i++) {
+                m_args.push_back(m_cmdLine[i]);
             }
         }
-    } else {
-        for (int i = 1; i < cmdLine.size(); i++) {
-            args.push_back(cmdLine[i]);
-        }
     }
 }
 
 ProcessInfo::ProcessInfo(std::vector<std::string> &cmd)
- : hasPid(false)
- , process(Process())
+    : m_hasPid(false)
+    , m_isValid(true)
+    , m_process(Process())
 {
-    if (cmd.size() == 0)
+    if (cmd.size() == 0) {
+        m_isValid = false;
         return;
+    }
 
-    cmdLine = cmd;
-    exe = cmd[0];
+    m_cmdLine = cmd;
+    m_exe = cmd[0];
     for (ulong i=0; i < cmd.size(); i++) {
         if (i > 0) {
-            args.push_back(cmd[i]);
+            m_args.push_back(cmd[i]);
         }
     }
 }
 
 std::string ProcessInfo::getEnv(std::string key)
 {
-    return process.getEnv(key);
+    return m_process.getEnv(key);
 }
 
 std::vector<std::string> ProcessInfo::getCmdLine()
 {
-    return cmdLine;
+    return m_cmdLine;
 }
 
 std::vector<std::string> ProcessInfo::getArgs()
 {
-    return args;
+    return m_args;
 }
 
 int ProcessInfo::getPid()
 {
-    return process.getPid();
+    return m_process.getPid();
 }
 
 int ProcessInfo::getPpid()
 {
-    return process.getPpid();
+    return m_process.getPpid();
 }
 
 bool ProcessInfo::initWithPid()
 {
-    return hasPid;
+    return m_hasPid;
+}
+
+bool ProcessInfo::isValid()
+{
+    return m_isValid;
 }
 
 std::string ProcessInfo::getExe()
 {
-    return exe;
+    return m_exe;
 }
 
 std::string ProcessInfo::getOneCommandLine()
 {
     std::string cmdline = getJoinedExeArgs();
-    return "sh -c 'cd " + cwd + "; exec " + cmdline + ";'";
+    return "sh -c 'cd " + m_cwd + "; exec " + cmdline + ";'";
 }
 
 std::string ProcessInfo::getShellScriptLines()
 {
     std::string cmdline = getJoinedExeArgs();
-    return "#!/bin/sh\n cd " + cwd + "\n exec " + cmdline + "\n";
+    return "#!/bin/sh\n cd " + m_cwd + "\n exec " + cmdline + "\n";
 }
 
 std::string ProcessInfo::getJoinedExeArgs()
 {
-    std::string ret = "\"" + exe + "\"";
-    for (auto arg : args) {
+    std::string ret = "\"" + m_exe + "\"";
+    for (auto arg : m_args) {
         ret += " \"" + arg + "\"";
     }
 
diff --git a/src/modules/dock/processinfo.h b/src/modules/dock/processinfo.h
index 8a9678c..9c35ec6 100644
--- a/src/modules/dock/processinfo.h
+++ b/src/modules/dock/processinfo.h
@@ -40,6 +40,7 @@ public:
     int getPid();
     int getPpid();
     bool initWithPid();
+    bool isValid();
     std::string getExe();
     std::string getOneCommandLine();
     std::string getShellScriptLines();
@@ -47,13 +48,14 @@ public:
 private:
     std::string getJoinedExeArgs();
 
-    std::vector<std::string> cmdLine;
-    std::vector<std::string> args;
-    std::string exe;
-    std::string cwd;
+    std::vector<std::string> m_cmdLine;
+    std::vector<std::string> m_args;
+    std::string m_exe;
+    std::string m_cwd;
 
-    bool hasPid;
-    Process process;
+    bool m_hasPid;
+    bool m_isValid;
+    Process m_process;
 };
 
 #endif // PROCESSINFO_H
diff --git a/src/modules/dock/windowinfobase.h b/src/modules/dock/windowinfobase.h
index 85a8a8d..1daf7bc 100644
--- a/src/modules/dock/windowinfobase.h
+++ b/src/modules/dock/windowinfobase.h
@@ -34,7 +34,11 @@ class WindowInfoBase
 {
 public:
     WindowInfoBase() : entry(nullptr), app(nullptr), processInfo(nullptr) {}
-    virtual ~WindowInfoBase() {}
+    virtual ~WindowInfoBase() {
+        if (processInfo) {
+            delete processInfo;
+        }
+    }
 
 
     virtual bool shouldSkip() = 0;
diff --git a/src/modules/dock/windowinfox.cpp b/src/modules/dock/windowinfox.cpp
index 19a4550..8c076fb 100644
--- a/src/modules/dock/windowinfox.cpp
+++ b/src/modules/dock/windowinfox.cpp
@@ -416,12 +416,15 @@ void WindowInfoX::updateProcessInfo()
     if (processInfo)
         delete processInfo;
 
+    qInfo() << "updateProcessInfo: pid=" << pid;
     processInfo = new ProcessInfo(pid);
-    if (!processInfo) {
+    if (!processInfo->isValid()) {
         // try WM_COMMAND
         auto wmComand = XCB->getWMCommand(winId);
-        if (wmComand.size() > 0)
+        if (wmComand.size() > 0) {
+            delete processInfo;
             processInfo = new ProcessInfo(wmComand);
+        }
     }
 
     qInfo() << "updateProcessInfo: pid is " << pid;