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z3 unknown result reported on QF_LRA formula #2375

@wintered

Description

@wintered
(declare-fun a () Real)  
(declare-fun b () Real)  
(declare-fun c () Real)  
(declare-fun d () Real)  
(declare-fun e () Real)  
(declare-fun f () Real)   
(assert (not (exists ((g Real)) 
    (= (and (< 0.0 b)) (= (= 0.0 a) (not (= (<= g a) (<= e d)))))))

)  
(assert (not  (= (<= 0.0  c) (or  (< (* c f) (/ 0 0))))))   
(check-sat)

z3 returns unknown for this formula which is unsatisfiable. Z3 seems to need quite some memory for this formula. Solving it ~100 times in a row occasionally results in an out of memory error or a segfault.

OS: Ubuntu 19.04
Revision: 60c504f

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