Patch gtest to terminate as soon as it detects that a ScopedTrace has migrated to another worker thread

.github/format.sh

@@ -33,7 +33,7 @@ do
       # Check if tab are present.
       egrep -Hn $'\t' $FILE && TAB_FOUND=1 || true
       ;;
-    *.pdf|*.hdf5|*.jpg|*.png|*.ppt|*.pptx|*.ipe)
+    *.pdf|*.hdf5|*.jpg|*.patch|*.png|*.ppt|*.pptx|*.ipe)
       # Exclude some binary files types,
       # others can be excluded as needed.
       ;;

external/CMakeLists.txt

@@ -18,7 +18,9 @@ FetchContent_Declare(
   GIT_REPOSITORY https://github.com/google/googletest.git
   GIT_TAG v1.13.0
   # Patch for int to float conversion warning.
-  PATCH_COMMAND git cherry-pick -n 5cd81a7848203d3df6959c148eb91f1a4ff32c1d -m 1
+  PATCH_COMMAND
+    git reset --hard HEAD && git cherry-pick -n 5cd81a7848203d3df6959c148eb91f1a4ff32c1d -m 1 && git
+    apply "${CMAKE_CURRENT_SOURCE_DIR}/scoped_trace_terminate_on_thread_migrate.patch"
 )
 set(BUILD_GMOCK OFF CACHE INTERNAL "")
 set(INSTALL_GTEST OFF CACHE INTERNAL "")

external/scoped_trace_terminate_on_thread_migrate.patch

@@ -0,0 +1,76 @@
+diff --git a/googletest/include/gtest/gtest.h b/googletest/include/gtest/gtest.h
+index 3e452a50..c51dd607 100644
+--- a/googletest/include/gtest/gtest.h
++++ b/googletest/include/gtest/gtest.h
+@@ -58,6 +58,7 @@
+ #include <set>
+ #include <sstream>
+ #include <string>
++#include <thread>
+ #include <type_traits>
+ #include <vector>
+
+@@ -2056,15 +2057,18 @@ class GTEST_API_ ScopedTrace {
+   // Slow, but flexible.
+   template <typename T>
+   ScopedTrace(const char* file, int line, const T& message) {
++    id = std::this_thread::get_id();
+     PushTrace(file, line, (Message() << message).GetString());
+   }
+
+   // Optimize for some known types.
+   ScopedTrace(const char* file, int line, const char* message) {
++    id = std::this_thread::get_id();
+     PushTrace(file, line, message ? message : "(null)");
+   }
+
+   ScopedTrace(const char* file, int line, const std::string& message) {
++    id = std::this_thread::get_id();
+     PushTrace(file, line, message);
+   }
+
+@@ -2079,6 +2083,8 @@ class GTEST_API_ ScopedTrace {
+
+   ScopedTrace(const ScopedTrace&) = delete;
+   ScopedTrace& operator=(const ScopedTrace&) = delete;
++
++  std::thread::id id;
+ };
+
+ // Causes a trace (including the source file path, the current line
+diff --git a/googletest/src/gtest.cc b/googletest/src/gtest.cc
+index a64e887c..2e1fccb9 100644
+--- a/googletest/src/gtest.cc
++++ b/googletest/src/gtest.cc
+@@ -44,14 +44,17 @@
+ #include <chrono>  // NOLINT
+ #include <cmath>
+ #include <cstdint>
++#include <exception>
+ #include <initializer_list>
+ #include <iomanip>
++#include <iostream>
+ #include <iterator>
+ #include <limits>
+ #include <list>
+ #include <map>
+ #include <ostream>  // NOLINT
+ #include <sstream>
++#include <thread>
+ #include <unordered_set>
+ #include <vector>
+
+@@ -6838,6 +6841,13 @@ void ScopedTrace::PushTrace(const char* file, int line, std::string message) {
+
+ // Pops the info pushed by the c'tor.
+ ScopedTrace::~ScopedTrace() GTEST_LOCK_EXCLUDED_(&UnitTest::mutex_) {
++  if (id != std::this_thread::get_id()) {
++    std::cerr << "ScopedTrace was created and destroyed on different "
++                 "std::threads, terminating to avoid segfaults, hangs, or "
++                 "silent corruption. Are you using any pika functionality that "
++                 "may yield a task after creating the ScopedTrace?\n";
++    std::terminate();
++  }
+   UnitTest::GetInstance()->PopGTestTrace();
+ }
+