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Technique detail:
Oracle change behavior of glibc pthread initialization internal function named __pthread_initialize_minimal_internal(),
A memory allocation operation added in __pthread_initialize_minimal_internal() and cause this memory allocatio action be capture by jemalloc.
Then Jemalloc will try to request current system clock time through another glibc function named clock_gettime() for recording each memory allocation request.
But at this moment, glibc not yet finish whole initialization steps, so there is NULL pointer accessing exception happen.
A similar discussion but is different root cause raised to jemalloc https://github.com/jemalloc/jemalloc/issues/2218
 
Keywords: Crash, Oracle Linux 7, glibc, known issue