diff --git a/lldb/bindings/interface/SBThread.i b/lldb/bindings/interface/SBThread.i
--- a/lldb/bindings/interface/SBThread.i
+++ b/lldb/bindings/interface/SBThread.i
@@ -104,6 +104,9 @@
     eStopReasonSignal        1     unix signal number
     eStopReasonException     N     exception data
     eStopReasonExec          0
+    eStopReasonFork          1     pid of the child process
+    eStopReasonVFork         1     pid of the child process
+    eStopReasonVForkDone     0
     eStopReasonPlanComplete  0") GetStopReasonDataAtIndex;
     uint64_t
     GetStopReasonDataAtIndex(uint32_t idx);
diff --git a/lldb/bindings/interface/SBThreadPlan.i b/lldb/bindings/interface/SBThreadPlan.i
--- a/lldb/bindings/interface/SBThreadPlan.i
+++ b/lldb/bindings/interface/SBThreadPlan.i
@@ -73,6 +73,9 @@
     eStopReasonSignal        1     unix signal number
     eStopReasonException     N     exception data
     eStopReasonExec          0
+    eStopReasonFork          1     pid of the child process
+    eStopReasonVFork         1     pid of the child process
+    eStopReasonVForkDone     0
     eStopReasonPlanComplete  0") GetStopReasonDataAtIndex;
     uint64_t
     GetStopReasonDataAtIndex(uint32_t idx);
diff --git a/lldb/docs/python_api_enums.rst b/lldb/docs/python_api_enums.rst
--- a/lldb/docs/python_api_enums.rst
+++ b/lldb/docs/python_api_enums.rst
@@ -342,6 +342,9 @@
 .. py:data:: eStopReasonSignal
 .. py:data:: eStopReasonException
 .. py:data:: eStopReasonExec
+.. py:data:: eStopReasonFork
+.. py:data:: eStopReasonVFork
+.. py:data:: eStopReasonVForkDone
 .. py:data:: eStopReasonPlanComplete
 .. py:data:: eStopReasonThreadExiting
 .. py:data:: eStopReasonInstrumentation
diff --git a/lldb/examples/python/performance.py b/lldb/examples/python/performance.py
--- a/lldb/examples/python/performance.py
+++ b/lldb/examples/python/performance.py
@@ -255,6 +255,15 @@
                                 select_thread = True
                                 if self.verbose:
                                     print("signal %d" % (thread.GetStopReasonDataAtIndex(0)))
+                            elif stop_reason == lldb.eStopReasonFork:
+                                if self.verbose:
+                                    print("fork pid = %d" % (thread.GetStopReasonDataAtIndex(0)))
+                            elif stop_reason == lldb.eStopReasonVFork:
+                                if self.verbose:
+                                    print("vfork pid = %d" % (thread.GetStopReasonDataAtIndex(0)))
+                            elif stop_reason == lldb.eStopReasonVForkDone:
+                                if self.verbose:
+                                    print("vfork done")
 
                             if select_thread and not selected_thread:
                                 self.thread = thread
diff --git a/lldb/include/lldb/API/SBThread.h b/lldb/include/lldb/API/SBThread.h
--- a/lldb/include/lldb/API/SBThread.h
+++ b/lldb/include/lldb/API/SBThread.h
@@ -66,6 +66,9 @@
   /// eStopReasonSignal        1     unix signal number
   /// eStopReasonException     N     exception data
   /// eStopReasonExec          0
+  /// eStopReasonFork          1     pid of the child process
+  /// eStopReasonVFork         1     pid of the child process
+  /// eStopReasonVForkDone     0
   /// eStopReasonPlanComplete  0
   uint64_t GetStopReasonDataAtIndex(uint32_t idx);
 
diff --git a/lldb/include/lldb/API/SBThreadPlan.h b/lldb/include/lldb/API/SBThreadPlan.h
--- a/lldb/include/lldb/API/SBThreadPlan.h
+++ b/lldb/include/lldb/API/SBThreadPlan.h
@@ -58,6 +58,9 @@
   /// eStopReasonSignal        1     unix signal number
   /// eStopReasonException     N     exception data
   /// eStopReasonExec          0
+  /// eStopReasonFork          1     pid of the child process
+  /// eStopReasonVFork         1     pid of the child process
+  /// eStopReasonVForkDone     0
   /// eStopReasonPlanComplete  0
   uint64_t GetStopReasonDataAtIndex(uint32_t idx);
 
diff --git a/lldb/include/lldb/Host/Debug.h b/lldb/include/lldb/Host/Debug.h
--- a/lldb/include/lldb/Host/Debug.h
+++ b/lldb/include/lldb/Host/Debug.h
@@ -144,6 +144,12 @@
       uint32_t data_count;
       lldb::addr_t data[8];
     } exception;
+
+    // eStopReasonFork / eStopReasonVFork
+    struct {
+      lldb::pid_t child_pid;
+      lldb::tid_t child_tid;
+    } fork;
   } details;
 };
 }
diff --git a/lldb/include/lldb/lldb-enumerations.h b/lldb/include/lldb/lldb-enumerations.h
--- a/lldb/include/lldb/lldb-enumerations.h
+++ b/lldb/include/lldb/lldb-enumerations.h
@@ -249,6 +249,9 @@
   eStopReasonThreadExiting,
   eStopReasonInstrumentation,
   eStopReasonProcessorTrace,
+  eStopReasonFork,
+  eStopReasonVFork,
+  eStopReasonVForkDone,
 };
 
 /// Command Return Status Types.
diff --git a/lldb/packages/Python/lldbsuite/test/lldbutil.py b/lldb/packages/Python/lldbsuite/test/lldbutil.py
--- a/lldb/packages/Python/lldbsuite/test/lldbutil.py
+++ b/lldb/packages/Python/lldbsuite/test/lldbutil.py
@@ -252,6 +252,12 @@
         return "watchpoint"
     elif enum == lldb.eStopReasonExec:
         return "exec"
+    elif enum == lldb.eStopReasonFork:
+        return "fork"
+    elif enum == lldb.eStopReasonVFork:
+        return "vfork"
+    elif enum == lldb.eStopReasonVForkDone:
+        return "vforkdone"
     elif enum == lldb.eStopReasonSignal:
         return "signal"
     elif enum == lldb.eStopReasonException:
diff --git a/lldb/source/API/SBThread.cpp b/lldb/source/API/SBThread.cpp
--- a/lldb/source/API/SBThread.cpp
+++ b/lldb/source/API/SBThread.cpp
@@ -173,6 +173,7 @@
         case eStopReasonThreadExiting:
         case eStopReasonInstrumentation:
         case eStopReasonProcessorTrace:
+        case eStopReasonVForkDone:
           // There is no data for these stop reasons.
           return 0;
 
@@ -195,6 +196,12 @@
 
         case eStopReasonException:
           return 1;
+
+        case eStopReasonFork:
+          return 1;
+
+        case eStopReasonVFork:
+          return 1;
         }
       }
     }
@@ -225,6 +232,7 @@
         case eStopReasonThreadExiting:
         case eStopReasonInstrumentation:
         case eStopReasonProcessorTrace:
+        case eStopReasonVForkDone:
           // There is no data for these stop reasons.
           return 0;
 
@@ -258,6 +266,12 @@
 
         case eStopReasonException:
           return stop_info_sp->GetValue();
+
+        case eStopReasonFork:
+          return stop_info_sp->GetValue();
+
+        case eStopReasonVFork:
+          return stop_info_sp->GetValue();
         }
       }
     }
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
@@ -659,6 +659,12 @@
     return "exec";
   case eStopReasonProcessorTrace:
     return "processor trace";
+  case eStopReasonFork:
+    return "fork";
+  case eStopReasonVFork:
+    return "vfork";
+  case eStopReasonVForkDone:
+    return "vforkdone";
   case eStopReasonInstrumentation:
   case eStopReasonInvalid:
   case eStopReasonPlanComplete:
@@ -934,6 +940,22 @@
     }
   }
 
+  // Include child process PID/TID for forks.
+  if (tid_stop_info.reason == eStopReasonFork ||
+      tid_stop_info.reason == eStopReasonVFork) {
+    assert(bool(m_extensions_supported &
+                NativeProcessProtocol::Extension::multiprocess));
+    if (tid_stop_info.reason == eStopReasonFork)
+      assert(bool(m_extensions_supported &
+                  NativeProcessProtocol::Extension::fork));
+    if (tid_stop_info.reason == eStopReasonVFork)
+      assert(bool(m_extensions_supported &
+                  NativeProcessProtocol::Extension::vfork));
+    response.Printf("%s:p%" PRIx64 ".%" PRIx64 ";", reason_str,
+                    tid_stop_info.details.fork.child_pid,
+                    tid_stop_info.details.fork.child_tid);
+  }
+
   return SendPacketNoLock(response.GetString());
 }
 
diff --git a/lldb/source/Target/Process.cpp b/lldb/source/Target/Process.cpp
--- a/lldb/source/Target/Process.cpp
+++ b/lldb/source/Target/Process.cpp
@@ -822,6 +822,9 @@
             case eStopReasonWatchpoint:
             case eStopReasonException:
             case eStopReasonExec:
+            case eStopReasonFork:
+            case eStopReasonVFork:
+            case eStopReasonVForkDone:
             case eStopReasonThreadExiting:
             case eStopReasonInstrumentation:
             case eStopReasonProcessorTrace:
diff --git a/lldb/source/Target/StackFrameList.cpp b/lldb/source/Target/StackFrameList.cpp
--- a/lldb/source/Target/StackFrameList.cpp
+++ b/lldb/source/Target/StackFrameList.cpp
@@ -131,6 +131,9 @@
   case eStopReasonWatchpoint:
   case eStopReasonException:
   case eStopReasonExec:
+  case eStopReasonFork:
+  case eStopReasonVFork:
+  case eStopReasonVForkDone:
   case eStopReasonSignal:
     // In all these cases we want to stop in the deepest frame.
     m_current_inlined_pc = curr_pc;
diff --git a/lldb/source/Target/Thread.cpp b/lldb/source/Target/Thread.cpp
--- a/lldb/source/Target/Thread.cpp
+++ b/lldb/source/Target/Thread.cpp
@@ -1679,6 +1679,12 @@
     return "exception";
   case eStopReasonExec:
     return "exec";
+  case eStopReasonFork:
+    return "fork";
+  case eStopReasonVFork:
+    return "vfork";
+  case eStopReasonVForkDone:
+    return "vfork done";
   case eStopReasonPlanComplete:
     return "plan complete";
   case eStopReasonThreadExiting:
diff --git a/lldb/tools/lldb-vscode/JSONUtils.cpp b/lldb/tools/lldb-vscode/JSONUtils.cpp
--- a/lldb/tools/lldb-vscode/JSONUtils.cpp
+++ b/lldb/tools/lldb-vscode/JSONUtils.cpp
@@ -878,6 +878,15 @@
   case lldb::eStopReasonExec:
     body.try_emplace("reason", "entry");
     break;
+  case lldb::eStopReasonFork:
+    body.try_emplace("reason", "fork");
+    break;
+  case lldb::eStopReasonVFork:
+    body.try_emplace("reason", "vfork");
+    break;
+  case lldb::eStopReasonVForkDone:
+    body.try_emplace("reason", "vforkdone");
+    break;
   case lldb::eStopReasonThreadExiting:
   case lldb::eStopReasonInvalid:
   case lldb::eStopReasonNone:
diff --git a/lldb/tools/lldb-vscode/LLDBUtils.cpp b/lldb/tools/lldb-vscode/LLDBUtils.cpp
--- a/lldb/tools/lldb-vscode/LLDBUtils.cpp
+++ b/lldb/tools/lldb-vscode/LLDBUtils.cpp
@@ -56,6 +56,9 @@
   case lldb::eStopReasonException:
   case lldb::eStopReasonExec:
   case lldb::eStopReasonProcessorTrace:
+  case lldb::eStopReasonFork:
+  case lldb::eStopReasonVFork:
+  case lldb::eStopReasonVForkDone:
     return true;
   case lldb::eStopReasonThreadExiting:
   case lldb::eStopReasonInvalid: