ydb/contrib/libs/grpc/patches/25-forkable-destruction-order.patch

--- a/src/core/lib/event_engine/forkable.cc	(index)
+++ b/src/core/lib/event_engine/forkable.cc	(working tree)
@@ -78,8 +78,13 @@ void ManageForkable(Forkable* forkable) {
 void StopManagingForkable(Forkable* forkable) {
   grpc_core::MutexLock lock(g_mu.get());
   auto iter = std::find(g_forkables->begin(), g_forkables->end(), forkable);
-  GPR_ASSERT(iter != g_forkables->end());
-  g_forkables->erase(iter);
+  // We've faced with the issue that destructor for TimerManager object is called
+  // between PrepareFork and PostforkParent.
+  // In result in PostforkParent we try to access not valid object via forkable ptr.
+  // https://github.com/grpc/grpc/issues/33516
+  if (iter != g_forkables->end()) {
+    g_forkables->erase(iter);
+  }
 }
 
 }  // namespace experimental
--- a/src/core/lib/event_engine/posix_engine/timer_manager.cc	(index)
+++ b/src/core/lib/event_engine/posix_engine/timer_manager.cc	(working tree)
@@ -144,7 +144,14 @@ void TimerManager::Shutdown() {
   }
 }
 
-TimerManager::~TimerManager() { Shutdown(); }
+TimerManager::~TimerManager() {
+    // We've faced with the issue that destructor for TimerManager object is called
+    // between PrepareFork and PostforkParent. see forkable.cc
+    // Let's remove object from g_forcable list here
+    // https://github.com/grpc/grpc/issues/33516
+    StopManagingForkable(this);
+    Shutdown();
+}
 
 void TimerManager::Host::Kick() { timer_manager_->Kick(); }