Add WA for the issue

This WA for the issue:
oneapi-src#894
It protects us from a recursion in malloc_usable_size()
when the JEMALLOC proxy_lib_pool is used.

TODO: remove this WA when the issue is fixed.

Signed-off-by: Lukasz Dorau <lukasz.dorau@intel.com>

Author: ldorau

src/proxy_lib/proxy_lib.c

@@ -128,6 +128,13 @@ static umf_memory_pool_handle_t Proxy_pool = NULL;
 // it protects us from recursion in umfPool*()
 static __TLS int was_called_from_umfPool = 0;
 
+// This WA for the issue:
+// https://github.com/oneapi-src/unified-memory-framework/issues/894
+// It protects us from a recursion in malloc_usable_size()
+// when the JEMALLOC proxy_lib_pool is used.
+// TODO remove this WA when the issue is fixed.
+static __TLS int was_called_from_malloc_usable_size = 0;
+
 /*****************************************************************************/
 /*** The constructor and destructor of the proxy library *********************/
 /*****************************************************************************/
@@ -472,15 +479,18 @@ size_t malloc_usable_size(void *ptr) {
         return 0; // unsupported in case of the ba_leak allocator
     }
 
-    if (Proxy_pool && (umfPoolByPtr(ptr) == Proxy_pool)) {
+    if (!was_called_from_malloc_usable_size && Proxy_pool &&
+        (umfPoolByPtr(ptr) == Proxy_pool)) {
+        was_called_from_malloc_usable_size = 1;
         was_called_from_umfPool = 1;
         size_t size = umfPoolMallocUsableSize(Proxy_pool, ptr);
         was_called_from_umfPool = 0;
+        was_called_from_malloc_usable_size = 0;
         return size;
     }
 
 #ifndef _WIN32
-    if (Size_threshold_value) {
+    if (!was_called_from_malloc_usable_size && Size_threshold_value) {
         return System_malloc_usable_size(ptr);
     }
 #endif /* _WIN32 */