A brief look at libc6 source code indicates that perhaps any call to 
_dl_catch_error may give rise to these valgrind warnings. The valgrind 
suppressions I indicated above may not be sufficient in that case to catch all 
dl-related valgrind warnings. You can probably suppress all these valgrind 
warnings with the following:
{
  dl_catch_error-leak
  Memcheck:Leak
  ...
  fun:_dl_catch_error
  ...
}
I'm no expert in either the glibc codebase or valgrind, so please evaluate this 
workaround for yourself.

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https://bugs.launchpad.net/bugs/883775

Title:
  non cumulative memory leak in dlopen/dlclose

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