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/usr/share/sagemath/ext/valgrind/sage.supp is in sagemath-common 7.4-9.

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# The file sage.supp is meant to be a suppression file containing only
# suppressions for errors which are actually benign.

# The file sage-liberal.supp is a file with more suppressions.  Use it
# if you wish search for memory leaks in new code without being
# bothered by memory leaks which (likely) occur in other parts of
# sage.

{
   zlib Decompression 1
   Memcheck:Cond
   fun:longest_match
   fun:deflate_slow
   fun:deflate
   fun:PyZlib_compress
}

{
   zlib Decompression 2
   Memcheck:Cond
   fun:longest_match
   fun:deflate_slow
   fun:deflate
   fun:PyZlib_flush
}

{
   Cython initmodule 1
   Memcheck:Leak
   fun:malloc
   fun:PyString_FromString
   fun:*__Pyx_ImportType*
}

{
   Cython initmodule 2
   Memcheck:Leak
   fun:malloc
   fun:PyCObject_FromVoidPtrAndDesc
   fun:*__Pyx_ExportFunction*
}