10000 (proof, opt.pb.compile_equality) Longstanding soundness bug on QF_LRA formula · Issue #4219 · Z3Prover/z3 · GitHub
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(proof, opt.pb.compile_equality) Longstanding soundness bug on QF_LRA formula #4219

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muchang opened this issue May 6, 2020 · 0 comments
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(proof, opt.pb.compile_equality) Longstanding soundness bug on QF_LRA formula #4219

muchang opened this issue May 6, 2020 · 0 comments

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@muchang
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muchang commented May 6, 2020

Hi,
For this case, Z3 gives an incorrect answer:

[676] % z3-4.8.5 proof=true opt.pb.compile_equality=true small.smt2
unsat
[677] % z3-4.8.6 proof=true opt.pb.compile_equality=true small.smt2
unsat
[678] % z3-4.8.7 proof=true opt.pb.compile_equality=true small.smt2
unsat
[679] % z3release proof=true opt.pb.compile_equality=true small.smt2
unsat
[680] % z3release small.smt2
sat
[681] % 
[681] % cat small.smt2
(declare-fun a () Bool)
(declare-fun b () Bool)
(declare-fun c () Bool)
(declare-fun d () Real)
(declare-fun e () Real)
(assert (<= (+ (ite c 1 0) (ite b 1 0)) 1))
(assert (= (ite c 1 0) (ite (>= (+ (ite b 1 0) (ite a (- 1) 0)) 1) 1 0)))
(assert (<= d 0 (+ (ite b 1 0) (ite a 1 0)) e))
(minimize 0)
(check-sat)
[682] %

OS: Ubuntu 18.04
Commit: f2449df
hgvk94 pushed a commit to hgvk94/z3 that referenced this issue May 7, 2020
@NikolajBjorner @hgvk94
fix Z3Prover#4219
9a81266
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