#0  mulx4x_internal () at crypto/bn/x86_64-mont5.s:2273
  [Error: x86_64-mont5.s was not found in source tree]
#1  0x00007fbcf2090a2f in bn_sqr8x_internal () at crypto/bn/x86_64-mont5.s:1760
  [Error: x86_64-mont5.s was not found in source tree]
#2  0x90c85e226814afc4 in ?? ()
#3  0x00007fff9284bab0 in ?? ()
#4  0x000055ccb8bd5e80 in ?? ()
#5  0x0000000000000000 in ?? ()