The following simple expression crashes Sage 8.0 on Arch Linux:
tavianator@cosmicray $ sage
> ┌────────────────────────────────────────────────────────────────────┐
> │ SageMath version 8.0, Release Date: 2017-07-21 │
> │ Type "notebook()" for the browser-based notebook interface. │
> │ Type "help()" for help. │
> └────────────────────────────────────────────────────────────────────┘
> sage: version()
> 'SageMath version 8.0, Release Date: 2017-07-21'
> sage: sage: (2*sqrt(x))^Rational(2)
> ---------------------------------------------------------------------------
> MemoryError Traceback (most recent call
> last)
> sage/rings/integer.pyx in sage.rings.integer.Integer.__repr__
> (/build/sagemath/src/sage-8.0/src/src/build/cythonized/sage/rings/integer.c:7976)
> ()
>
> sage/rings/integer.pyx in sage.rings.integer.Integer.str
> (/build/sagemath/src/sage-8.0/src/src/build/cythonized/sage/rings/integer.c:8429)
> ()
>
> memory.pxd in cysignals.memory.check_malloc
> (/build/sagemath/src/sage-8.0/src/src/build/cythonized/sage/rings/integer.c:45920)
> ()
>
> MemoryError: failed to allocate 1292913990 bytes
> Exception MemoryError: MemoryError('failed to allocate 1292913990 bytes',)
> in 'sage.libs.pynac.pynac.py_repr' ignored
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