diff --git a/interfaces/innerkits/dump_catcher/lite_perf.cpp b/interfaces/innerkits/dump_catcher/lite_perf.cpp
index 0b89c8ff117770d9c8cbf08171a0c8ed9ea267d9..c1bfd55c1cde004b2c637efacbcee55c6ef9bec0 100644
--- a/interfaces/innerkits/dump_catcher/lite_perf.cpp
+++ b/interfaces/innerkits/dump_catcher/lite_perf.cpp
@@ -300,9 +300,9 @@ int LitePerf::Impl::ExecDump(const std::vector<int>& tids, int freq, int duratio
     }
 
     pid_t pid = 0;
-    pid = vfork();
+    pid = fork();
     if (pid < 0) {
-        DFXLOGE("Failed to vfork.");
+        DFXLOGE("Failed to fork.");
         return -1;
     }
     if (pid == 0) {
@@ -312,9 +312,9 @@ int LitePerf::Impl::ExecDump(const std::vector<int>& tids, int freq, int duratio
             _exit(-1);
         }
 
-        pid_t dumpPid = vfork();
+        pid_t dumpPid = fork();
         if (dumpPid < 0) {
-            DFXLOGE("Failed to vfork.");
+            DFXLOGE("Failed to fork.");
             _exit(-1);
         }
         if (dumpPid == 0) {
diff --git a/interfaces/innerkits/formatter/dfx_json_formatter.cpp b/interfaces/innerkits/formatter/dfx_json_formatter.cpp
index ac349891bac541a3055b61ea8456da37a51cb195..0dc02ca37c69c3f0643476d698ae985b46abaf9d 100644
--- a/interfaces/innerkits/formatter/dfx_json_formatter.cpp
+++ b/interfaces/innerkits/formatter/dfx_json_formatter.cpp
@@ -27,6 +27,14 @@ namespace HiviewDFX {
 #ifndef is_ohos_lite
 namespace {
 const int FRAME_BUF_LEN = 1024;
+static std::string JsonAsString(const Json::Value& val)
+{
+    if (val.isConvertibleTo(Json::stringValue)) {
+        return val.asString();
+    }
+    return "";
+}
+
 static bool FormatJsFrame(const Json::Value& frames, const uint32_t& frameIdx, std::string& outStr)
 {
     const int jsIdxLen = 10;
@@ -36,18 +44,18 @@ static bool FormatJsFrame(const Json::Value& frames, const uint32_t& frameIdx, s
         return false;
     }
     outStr = std::string(buf);
-    std::string symbol = frames[frameIdx]["symbol"].asString();
+    std::string symbol = JsonAsString(frames[frameIdx]["symbol"]);
     if (!symbol.empty()) {
         outStr.append(" " + symbol);
     }
-    std::string packageName = frames[frameIdx]["packageName"].asString();
+    std::string packageName = JsonAsString(frames[frameIdx]["packageName"]);
     if (!packageName.empty()) {
         outStr.append(" " + packageName);
     }
-    std::string file = frames[frameIdx]["file"].asString();
+    std::string file = JsonAsString(frames[frameIdx]["file"]);
     if (!file.empty()) {
-        std::string line = frames[frameIdx]["line"].asString();
-        std::string column = frames[frameIdx]["column"].asString();
+        std::string line = JsonAsString(frames[frameIdx]["line"]);
+        std::string column = JsonAsString(frames[frameIdx]["column"]);
         outStr.append(" (" + file + ":" + line + ":" + column + ")");
     }
     return true;
@@ -57,11 +65,11 @@ static bool FormatNativeFrame(const Json::Value& frames, const uint32_t& frameId
 {
     char buf[FRAME_BUF_LEN] = {0};
     char format[] = "#%02u pc %s %s";
-    std::string buildId = frames[frameIdx]["buildId"].asString();
-    std::string file = frames[frameIdx]["file"].asString();
-    std::string offset = frames[frameIdx]["offset"].asString();
-    std::string pc = frames[frameIdx]["pc"].asString();
-    std::string symbol = frames[frameIdx]["symbol"].asString();
+    std::string buildId = JsonAsString(frames[frameIdx]["buildId"]);
+    std::string file = JsonAsString(frames[frameIdx]["file"]);
+    std::string offset = JsonAsString(frames[frameIdx]["offset"]);
+    std::string pc = JsonAsString(frames[frameIdx]["pc"]);
+    std::string symbol = JsonAsString(frames[frameIdx]["symbol"]);
     if (snprintf_s(buf, sizeof(buf), sizeof(buf) - 1, format, frameIdx, pc.c_str(),
                    file.empty() ? "Unknown" : file.c_str()) <= 0) {
         return false;
@@ -91,13 +99,13 @@ bool DfxJsonFormatter::FormatJsonStack(const std::string& jsonStack, std::string
         Json::Value thread = threads[i];
         if (thread["tid"].isConvertibleTo(Json::stringValue) &&
             thread["thread_name"].isConvertibleTo(Json::stringValue)) {
-            ss += "Tid:" + thread["tid"].asString() + ", Name:" + thread["thread_name"].asString() + "\n";
+            ss += "Tid:" + JsonAsString(thread["tid"]) + ", Name:" + JsonAsString(thread["thread_name"]) + "\n";
         }
         const Json::Value frames = thread["frames"];
         for (uint32_t j = 0; j < frames.size(); ++j) {
             std::string frameStr = "";
             bool formatStatus = false;
-            if (frames[j]["line"].asString().empty()) {
+            if (JsonAsString(frames[j]["line"]).empty()) {
                 formatStatus = FormatNativeFrame(frames, j, frameStr);
             } else {
                 formatStatus = FormatJsFrame(frames, j, frameStr);
diff --git a/interfaces/innerkits/signal_handler/dfx_dumprequest.c b/interfaces/innerkits/signal_handler/dfx_dumprequest.c
index be28a8955b2f5776b49738e025877d27e1967a4e..429fe5047b65ef9af20053f3961b1c20014b31e8 100644
--- a/interfaces/innerkits/signal_handler/dfx_dumprequest.c
+++ b/interfaces/innerkits/signal_handler/dfx_dumprequest.c
@@ -430,7 +430,7 @@ static bool StartProcessdump(void)
 
 static bool StartVMProcessUnwind(void)
 {
-    uint32_t startTime = GetAbsTimeMilliSecondsCInterce();
+    uint64_t startTime = GetAbsTimeMilliSecondsCInterce();
     pid_t pid = ForkBySyscall();
     if (pid < 0) {
         DFXLOGE("Failed to fork vm process(%{public}d)", errno);
diff --git a/tools/process_dump/lperf/lperf_events.cpp b/tools/process_dump/lperf/lperf_events.cpp
index d10cf989b56f9bc59e542f319f7b9d4ec0741e7f..ea85e4b103f59231e28a6be6295df25132162841 100644
--- a/tools/process_dump/lperf/lperf_events.cpp
+++ b/tools/process_dump/lperf/lperf_events.cpp
@@ -178,7 +178,7 @@ void LperfEvents::GetRecordFieldFromMmap(MmapFd& mmap, void* dest, size_t destSi
     if (memcpy_s(dest, destSize, mmap.buf + pos, copySize) != 0) {
         DFXLOGE("memcpy_s failed. size %{public}zd", copySize);
     }
-    if (copySize < size) {
+    if (copySize < size && destSize > copySize) {
         size -= copySize;
         if (memcpy_s(static_cast<uint8_t *>(dest) + copySize, destSize - copySize, mmap.buf, size) != 0) {
             DFXLOGE("memcpy_s mmap.buf to dest failed. size %{public}zd", size);