We have bumped into an issue after updating to Parallel Studio XE 18.0.0. See the details below (including the reduced test case). The following works on 17.4.0 (SLES 12 SP2). Seems like a bug in the compiler...
$ ifort -v
ifort version 18.0.0
$ cat /tmp/decext_testcase.f
$ ifort -init=snan /tmp/decext_testcase.f
/tmp/decext_testcase.f: catastrophic error: **Internal compiler error: segmentation violation signal raised** Please report this error along with the circumstances in which it occurred in a Software Problem Report. Note: File and line given may not be explicit cause of this error.
compilation aborted for /tmp/decext_testcase.f (code 1)