ValgrindBadSuppressions

(Observed with valgrind 3.2.1)
Valgrind sometimes produces supressions that don't work, like this:

{
<insert a suppression name here>
Memcheck:Free
fun:_vgrZU_libcZdsoZa_free
fun:main
}

The identifying characteristic is that they begin with fun:_vg<something>

http://article.gmane.org/gmane.comp.debugging.valgrind/5939 explains what these symbols are.

The workaround is to replace fun:vg*_lib*<something> with fun:<something>, where something
should be a valid C or C++ mangled symbol.

The following test program demonstrates the problem

#include <stdlib.h>
int main(int argc,char**argv) {
char*p = malloc(10);
free(p);
free(p);
}