Dear Lorenzo, Paolo and others, Thank you all for your very helpful suggestions! I have tried adding .d0 after the values for ecutwfc and ecutrho, but the same error persists. The compilers for QE 5.4.0 on Stampede are ifort and icc 15.0.2. I compiled QE 5.1.2 using the same compilers, but the same error occured again. This should confirm that it is a bug related to the compiler. I will try QE 5.0.3 since it is compiled by ifort and icc 13.0.2 on Stampede.
-- Jingyang 'Mark' Wang School of Applied and Engineering Physics Cornell University
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