diff -aruN a/CFBase.c b/CFBase.c
--- a/CFBase.c	2011-08-10 16:29:04.841083602 -0700
+++ b/CFBase.c	2011-08-10 15:46:44.000000000 -0700
@@ -44,6 +44,7 @@
 #include <mach/mach.h>
 #include <dlfcn.h>
 #elif DEPLOYMENT_TARGET_LINUX
+#include <mcheck.h>
 #include <pthread.h>
 #elif DEPLOYMENT_TARGET_WINDOWS
 #include <windows.h>
@@ -281,6 +282,14 @@
 }
 
 static void __CFAllocatorSystemDeallocate(void *ptr, void *info) {
+#if defined(DEBUG)
+    const enum mcheck_status status = mprobe(ptr);
+
+    CFAssert3(status == MCHECK_OK || status == MCHECK_DISABLED,
+              __kCFLogAssertion, "%s: ptr %p status %d",
+              __PRETTY_FUNCTION__, ptr, status);
+#endif
+
     free(ptr);
 }
 #endif