From 89528d7c3a9f2b5ea365f2ae4988390ab2ca71ab Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.a.alekhin@gmail.com>
Date: Sat, 28 Jul 2018 10:29:26 +0000
Subject: [PATCH] core(ocl): don't expose exceptions from OpenCL callback

to avoid silent crashes of OpenCL worker threads.
---
 modules/core/src/ocl.cpp | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/modules/core/src/ocl.cpp b/modules/core/src/ocl.cpp
index cc6feacbbb..05f128baa7 100644
--- a/modules/core/src/ocl.cpp
+++ b/modules/core/src/ocl.cpp
@@ -2834,7 +2834,22 @@ extern "C" {
 
 static void CL_CALLBACK oclCleanupCallback(cl_event e, cl_int, void *p)
 {
-    ((cv::ocl::Kernel::Impl*)p)->finit(e);
+    try
+    {
+        ((cv::ocl::Kernel::Impl*)p)->finit(e);
+    }
+    catch (const cv::Exception& exc)
+    {
+        CV_LOG_ERROR(NULL, "OCL: Unexpected OpenCV exception in OpenCL callback: " << exc.what());
+    }
+    catch (const std::exception& exc)
+    {
+        CV_LOG_ERROR(NULL, "OCL: Unexpected C++ exception in OpenCL callback: " << exc.what());
+    }
+    catch (...)
+    {
+        CV_LOG_ERROR(NULL, "OCL: Unexpected unknown C++ exception in OpenCL callback");
+    }
 }
 
 }