Ok I finally ended up in pynac code.
It seems there is a bad recursion happening, with the following reversed 
backtrace:
(Sage.)Expression._mul_
Ginac::*
Ginac::exmul
Ginac::ex::ex
Ginac::ex::construct_from_basic
Ginac::mul::eval
Ginac::ex::ex
Ginac::ex::construct_from_basic
Ginac::mul::eval
...
Ginac::ex::ex
Ginac::ex::construct_from_basic
Ginac::mul::eval
Ginac::ex::integer_content
which calls sage code
which calls pynac code
...

The latter sage/pynac back and forth movement involves the numeric class in 
pynac which uses sage...

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