For me it also crashes pretty consistently (using a build of Sage
4.6.alpha2 on 64-bit Ubuntu, which I know passes tests except some
clearly irrelevant known issues). It looks to me like the error isn't
in the real root finding code per se, but comes up when doing
"change_ring(RR)" on any polynomial with non-constant symbolic
entries:
sage: a = var('a')
sage: R.<x> = a.parent()[]
sage: (x - a).change_ring(RR) # boom!
David
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