Index: lldb/trunk/source/Plugins/Process/Linux/NativeProcessLinux.cpp
===================================================================
--- lldb/trunk/source/Plugins/Process/Linux/NativeProcessLinux.cpp
+++ lldb/trunk/source/Plugins/Process/Linux/NativeProcessLinux.cpp
@@ -554,7 +554,8 @@
         eDupStderrFailed,
         eChdirFailed,
         eExecFailed,
-        eSetGidFailed
+        eSetGidFailed,
+        eSetSigMaskFailed
     };
 
     // Child process.
@@ -632,6 +633,12 @@
             }
         }
 
+        // Clear the signal mask to prevent the child from being affected by
+        // any masking done by the parent.
+        sigset_t set;
+        if (sigemptyset(&set) != 0 || pthread_sigmask(SIG_SETMASK, &set, nullptr) != 0)
+            exit(eSetSigMaskFailed);
+
         // Execute.  We should never return...
         execve(argv[0],
                const_cast<char *const *>(argv),
@@ -689,6 +696,9 @@
             case eSetGidFailed:
                 error.SetErrorString("Child setgid failed.");
                 break;
+            case eSetSigMaskFailed:
+                error.SetErrorString("Child failed to set signal mask.");
+                break;
             default:
                 error.SetErrorString("Child returned unknown exit status.");
                 break;
Index: lldb/trunk/test/expression_command/call-restarts/TestCallThatRestarts.py
===================================================================
--- lldb/trunk/test/expression_command/call-restarts/TestCallThatRestarts.py
+++ lldb/trunk/test/expression_command/call-restarts/TestCallThatRestarts.py
@@ -29,7 +29,6 @@
 
     @dwarf_test
     @skipIfFreeBSD # llvm.org/pr19246: intermittent failure
-    @expectedFailureLinux("llvm.org/pr19246")
     @skipIfDarwin # llvm.org/pr19246: intermittent failure
     @skipIfWindows # Test relies on signals, unsupported on Windows
     def test_with_dwarf(self):