santizer problems with dynamic thread local storage

I updated a powerpc64 be system from fedora 25 (glibc 2.24) to fedora 26 (glibc 2.25) and several test cases started failing that deal with dynamic thread local storage.

Failing Tests (3):
     LeakSanitizer-AddressSanitizer-powerpc64 :: TestCases/Linux/use_tls_dynamic.cc
     LeakSanitizer-Standalone-powerpc64 :: TestCases/Linux/use_tls_dynamic.cc
     MemorySanitizer-POWERPC64 :: dtls_test.c

I looked at dtls_test.c in detail

******************** TEST 'MemorySanitizer-POWERPC64 :: dtls_test.c' FAILED ********************
Script: