java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/programs/toy/nonlinear/Mult1-Safe.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-bd42740 [2018-09-23 21:40:18,527 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-23 21:40:18,530 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-23 21:40:18,550 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-23 21:40:18,551 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-23 21:40:18,552 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-23 21:40:18,554 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-23 21:40:18,557 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-23 21:40:18,558 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-23 21:40:18,559 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-23 21:40:18,560 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-23 21:40:18,560 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-23 21:40:18,563 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-23 21:40:18,564 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-23 21:40:18,565 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-23 21:40:18,566 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-23 21:40:18,567 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-23 21:40:18,568 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-23 21:40:18,570 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-23 21:40:18,572 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-23 21:40:18,573 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-23 21:40:18,575 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-23 21:40:18,577 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-09-23 21:40:18,587 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf [2018-09-23 21:40:18,602 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-23 21:40:18,602 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-23 21:40:18,603 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-23 21:40:18,604 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-23 21:40:18,604 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-23 21:40:18,604 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-23 21:40:18,605 INFO L133 SettingsManager]: * Use SBE=true [2018-09-23 21:40:18,605 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-23 21:40:18,605 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-23 21:40:18,605 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-23 21:40:18,606 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-23 21:40:18,606 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-23 21:40:18,606 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-23 21:40:18,606 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-23 21:40:18,606 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-23 21:40:18,607 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-23 21:40:18,607 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-23 21:40:18,607 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-23 21:40:18,607 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-23 21:40:18,608 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-23 21:40:18,608 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-23 21:40:18,608 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-23 21:40:18,608 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-23 21:40:18,608 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-23 21:40:18,609 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-23 21:40:18,609 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-23 21:40:18,609 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-23 21:40:18,609 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-23 21:40:18,609 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-23 21:40:18,610 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-23 21:40:18,661 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-23 21:40:18,677 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-23 21:40:18,683 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-23 21:40:18,685 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-23 21:40:18,686 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-23 21:40:18,687 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/nonlinear/Mult1-Safe.bpl [2018-09-23 21:40:18,688 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/nonlinear/Mult1-Safe.bpl' [2018-09-23 21:40:18,743 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-23 21:40:18,748 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-23 21:40:18,749 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-23 21:40:18,749 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-23 21:40:18,749 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-23 21:40:18,773 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:40:18" (1/1) ... [2018-09-23 21:40:18,787 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:40:18" (1/1) ... [2018-09-23 21:40:18,792 WARN L165 Inliner]: Program contained no entry procedure! [2018-09-23 21:40:18,793 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-09-23 21:40:18,793 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-09-23 21:40:18,795 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-23 21:40:18,796 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-23 21:40:18,796 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-23 21:40:18,796 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-23 21:40:18,808 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:40:18" (1/1) ... [2018-09-23 21:40:18,809 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:40:18" (1/1) ... [2018-09-23 21:40:18,809 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:40:18" (1/1) ... [2018-09-23 21:40:18,810 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:40:18" (1/1) ... [2018-09-23 21:40:18,814 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:40:18" (1/1) ... [2018-09-23 21:40:18,819 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:40:18" (1/1) ... [2018-09-23 21:40:18,820 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:40:18" (1/1) ... [2018-09-23 21:40:18,821 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-23 21:40:18,822 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-23 21:40:18,822 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-23 21:40:18,822 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-23 21:40:18,824 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:40:18" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-23 21:40:18,902 INFO L124 BoogieDeclarations]: Specification and implementation of procedure mult given in one single declaration [2018-09-23 21:40:18,902 INFO L130 BoogieDeclarations]: Found specification of procedure mult [2018-09-23 21:40:18,902 INFO L138 BoogieDeclarations]: Found implementation of procedure mult [2018-09-23 21:40:18,962 WARN L614 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2018-09-23 21:40:19,046 INFO L351 CfgBuilder]: Using library mode [2018-09-23 21:40:19,047 INFO L202 PluginConnector]: Adding new model Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.09 09:40:19 BoogieIcfgContainer [2018-09-23 21:40:19,047 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-23 21:40:19,049 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-23 21:40:19,049 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-23 21:40:19,052 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-23 21:40:19,052 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:40:18" (1/2) ... [2018-09-23 21:40:19,053 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ee83e68 and model type Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.09 09:40:19, skipping insertion in model container [2018-09-23 21:40:19,054 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Mult1-Safe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.09 09:40:19" (2/2) ... [2018-09-23 21:40:19,056 INFO L112 eAbstractionObserver]: Analyzing ICFG Mult1-Safe.bpl [2018-09-23 21:40:19,065 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-23 21:40:19,073 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-23 21:40:19,123 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-23 21:40:19,124 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-23 21:40:19,124 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-23 21:40:19,124 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-23 21:40:19,125 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-23 21:40:19,125 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-23 21:40:19,125 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-23 21:40:19,125 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-23 21:40:19,125 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-23 21:40:19,141 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-09-23 21:40:19,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-23 21:40:19,147 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:19,148 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-23 21:40:19,150 INFO L423 AbstractCegarLoop]: === Iteration 1 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:19,162 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:19,163 INFO L82 PathProgramCache]: Analyzing trace with hash 924708, now seen corresponding path program 1 times [2018-09-23 21:40:19,165 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:19,166 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:19,221 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:19,222 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:19,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:19,253 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:19,253 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:19,253 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:19,264 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:19,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:40:19,282 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:19,474 WARN L178 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-09-23 21:40:19,573 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:19,596 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-23 21:40:19,596 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-23 21:40:19,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-23 21:40:19,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-23 21:40:19,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-09-23 21:40:19,617 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 5 states. [2018-09-23 21:40:19,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:19,728 INFO L93 Difference]: Finished difference Result 10 states and 10 transitions. [2018-09-23 21:40:19,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-23 21:40:19,730 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2018-09-23 21:40:19,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:19,746 INFO L225 Difference]: With dead ends: 10 [2018-09-23 21:40:19,747 INFO L226 Difference]: Without dead ends: 6 [2018-09-23 21:40:19,750 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2018-09-23 21:40:19,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2018-09-23 21:40:19,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2018-09-23 21:40:19,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-09-23 21:40:19,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2018-09-23 21:40:19,791 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2018-09-23 21:40:19,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:19,791 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2018-09-23 21:40:19,791 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-23 21:40:19,792 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2018-09-23 21:40:19,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-09-23 21:40:19,792 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:19,792 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-09-23 21:40:19,795 INFO L423 AbstractCegarLoop]: === Iteration 2 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:19,795 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:19,795 INFO L82 PathProgramCache]: Analyzing trace with hash 28663973, now seen corresponding path program 1 times [2018-09-23 21:40:19,795 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:19,796 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:19,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:19,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:19,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:19,801 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:19,802 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:19,802 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:19,819 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:19,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:40:19,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:19,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:19,926 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:19,927 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2018-09-23 21:40:19,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-23 21:40:19,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-23 21:40:19,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-23 21:40:19,929 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 5 states. [2018-09-23 21:40:20,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:20,092 INFO L93 Difference]: Finished difference Result 9 states and 9 transitions. [2018-09-23 21:40:20,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-23 21:40:20,093 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2018-09-23 21:40:20,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:20,094 INFO L225 Difference]: With dead ends: 9 [2018-09-23 21:40:20,094 INFO L226 Difference]: Without dead ends: 7 [2018-09-23 21:40:20,096 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-09-23 21:40:20,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-23 21:40:20,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-23 21:40:20,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-23 21:40:20,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-23 21:40:20,100 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 5 [2018-09-23 21:40:20,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:20,100 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-23 21:40:20,100 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-23 21:40:20,103 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-23 21:40:20,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-23 21:40:20,104 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:20,104 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-09-23 21:40:20,104 INFO L423 AbstractCegarLoop]: === Iteration 3 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:20,105 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:20,105 INFO L82 PathProgramCache]: Analyzing trace with hash 888581188, now seen corresponding path program 2 times [2018-09-23 21:40:20,105 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:20,105 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:20,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:20,107 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:20,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:20,114 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:20,115 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:20,115 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:20,134 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:40:20,149 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:40:20,149 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:20,151 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:20,445 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:20,465 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:20,466 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2018-09-23 21:40:20,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-23 21:40:20,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-23 21:40:20,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-23 21:40:20,467 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 6 states. [2018-09-23 21:40:20,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:20,546 INFO L93 Difference]: Finished difference Result 10 states and 10 transitions. [2018-09-23 21:40:20,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-23 21:40:20,551 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2018-09-23 21:40:20,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:20,551 INFO L225 Difference]: With dead ends: 10 [2018-09-23 21:40:20,552 INFO L226 Difference]: Without dead ends: 8 [2018-09-23 21:40:20,552 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-09-23 21:40:20,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-09-23 21:40:20,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-09-23 21:40:20,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-09-23 21:40:20,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-09-23 21:40:20,556 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-09-23 21:40:20,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:20,557 INFO L480 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-09-23 21:40:20,557 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-23 21:40:20,557 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-09-23 21:40:20,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-09-23 21:40:20,558 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:20,558 INFO L375 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1] [2018-09-23 21:40:20,558 INFO L423 AbstractCegarLoop]: === Iteration 4 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:20,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:20,559 INFO L82 PathProgramCache]: Analyzing trace with hash 1776211077, now seen corresponding path program 3 times [2018-09-23 21:40:20,559 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:20,559 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:20,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:20,560 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:20,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:20,568 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:20,568 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:20,568 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:20,578 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:40:20,588 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-09-23 21:40:20,588 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:20,590 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:20,785 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:20,807 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:20,807 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2018-09-23 21:40:20,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-23 21:40:20,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-23 21:40:20,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-23 21:40:20,808 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 7 states. [2018-09-23 21:40:20,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:20,897 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-23 21:40:20,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-23 21:40:20,897 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2018-09-23 21:40:20,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:20,898 INFO L225 Difference]: With dead ends: 11 [2018-09-23 21:40:20,898 INFO L226 Difference]: Without dead ends: 9 [2018-09-23 21:40:20,899 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2018-09-23 21:40:20,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-23 21:40:20,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-23 21:40:20,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-23 21:40:20,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-23 21:40:20,906 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2018-09-23 21:40:20,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:20,906 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-23 21:40:20,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-23 21:40:20,907 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-23 21:40:20,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-23 21:40:20,907 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:20,907 INFO L375 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2018-09-23 21:40:20,908 INFO L423 AbstractCegarLoop]: === Iteration 5 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:20,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:20,908 INFO L82 PathProgramCache]: Analyzing trace with hash -772033436, now seen corresponding path program 4 times [2018-09-23 21:40:20,908 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:20,908 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:20,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:20,909 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:20,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:20,917 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:20,917 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:20,917 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:20,930 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:40:20,940 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:40:20,940 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:20,941 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:21,397 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:21,417 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:21,417 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2018-09-23 21:40:21,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-23 21:40:21,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-23 21:40:21,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-23 21:40:21,418 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 8 states. [2018-09-23 21:40:21,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:21,591 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2018-09-23 21:40:21,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-23 21:40:21,591 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 8 [2018-09-23 21:40:21,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:21,592 INFO L225 Difference]: With dead ends: 12 [2018-09-23 21:40:21,592 INFO L226 Difference]: Without dead ends: 10 [2018-09-23 21:40:21,593 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2018-09-23 21:40:21,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-09-23 21:40:21,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-09-23 21:40:21,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-09-23 21:40:21,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-09-23 21:40:21,596 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2018-09-23 21:40:21,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:21,597 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-09-23 21:40:21,597 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-23 21:40:21,597 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-09-23 21:40:21,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-09-23 21:40:21,598 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:21,598 INFO L375 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1] [2018-09-23 21:40:21,598 INFO L423 AbstractCegarLoop]: === Iteration 6 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:21,598 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:21,599 INFO L82 PathProgramCache]: Analyzing trace with hash 1836765285, now seen corresponding path program 5 times [2018-09-23 21:40:21,599 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:21,599 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:21,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:21,600 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:21,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:21,609 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:21,609 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:21,609 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:21,619 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:40:21,631 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-09-23 21:40:21,631 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:21,633 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:21,780 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:21,801 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:21,801 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2018-09-23 21:40:21,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-23 21:40:21,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-23 21:40:21,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-23 21:40:21,803 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 9 states. [2018-09-23 21:40:21,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:21,935 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-23 21:40:21,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-23 21:40:21,936 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 9 [2018-09-23 21:40:21,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:21,937 INFO L225 Difference]: With dead ends: 13 [2018-09-23 21:40:21,937 INFO L226 Difference]: Without dead ends: 11 [2018-09-23 21:40:21,938 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2018-09-23 21:40:21,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-23 21:40:21,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-23 21:40:21,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-23 21:40:21,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-23 21:40:21,941 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2018-09-23 21:40:21,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:21,942 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-23 21:40:21,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-23 21:40:21,942 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-23 21:40:21,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-23 21:40:21,943 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:21,943 INFO L375 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1] [2018-09-23 21:40:21,943 INFO L423 AbstractCegarLoop]: === Iteration 7 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:21,943 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:21,943 INFO L82 PathProgramCache]: Analyzing trace with hash 1105147012, now seen corresponding path program 6 times [2018-09-23 21:40:21,943 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:21,944 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:21,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:21,945 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:21,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:21,953 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:21,954 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:21,954 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:21,962 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:40:21,977 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2018-09-23 21:40:21,978 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:21,980 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:22,160 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:22,181 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:22,181 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2018-09-23 21:40:22,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-23 21:40:22,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-23 21:40:22,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-23 21:40:22,182 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 10 states. [2018-09-23 21:40:22,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:22,348 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-09-23 21:40:22,349 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-23 21:40:22,349 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 10 [2018-09-23 21:40:22,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:22,350 INFO L225 Difference]: With dead ends: 14 [2018-09-23 21:40:22,351 INFO L226 Difference]: Without dead ends: 12 [2018-09-23 21:40:22,351 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2018-09-23 21:40:22,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-09-23 21:40:22,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-09-23 21:40:22,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-09-23 21:40:22,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-09-23 21:40:22,355 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-09-23 21:40:22,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:22,355 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-09-23 21:40:22,355 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-23 21:40:22,356 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-09-23 21:40:22,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-09-23 21:40:22,356 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:22,356 INFO L375 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1] [2018-09-23 21:40:22,356 INFO L423 AbstractCegarLoop]: === Iteration 8 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:22,357 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:22,357 INFO L82 PathProgramCache]: Analyzing trace with hash -100182971, now seen corresponding path program 7 times [2018-09-23 21:40:22,357 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:22,357 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:22,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:22,358 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:22,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:22,368 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:22,368 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:22,368 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:22,386 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:22,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:40:22,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:22,594 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:22,617 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:22,618 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2018-09-23 21:40:22,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-23 21:40:22,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-23 21:40:22,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-23 21:40:22,619 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 11 states. [2018-09-23 21:40:22,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:22,755 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-23 21:40:22,755 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-23 21:40:22,755 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 11 [2018-09-23 21:40:22,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:22,756 INFO L225 Difference]: With dead ends: 15 [2018-09-23 21:40:22,757 INFO L226 Difference]: Without dead ends: 13 [2018-09-23 21:40:22,758 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2018-09-23 21:40:22,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-23 21:40:22,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-23 21:40:22,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-23 21:40:22,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-23 21:40:22,761 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2018-09-23 21:40:22,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:22,761 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-23 21:40:22,761 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-23 21:40:22,762 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-23 21:40:22,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-23 21:40:22,762 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:22,762 INFO L375 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1] [2018-09-23 21:40:22,762 INFO L423 AbstractCegarLoop]: === Iteration 9 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:22,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:22,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1189293220, now seen corresponding path program 8 times [2018-09-23 21:40:22,763 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:22,763 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:22,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:22,764 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:22,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:22,774 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:22,774 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:22,774 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:22,784 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:40:22,804 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:40:22,805 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:22,807 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:22,956 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:22,979 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:22,979 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2018-09-23 21:40:22,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-23 21:40:22,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-23 21:40:22,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-23 21:40:22,980 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 12 states. [2018-09-23 21:40:23,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:23,118 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-09-23 21:40:23,119 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-23 21:40:23,119 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 12 [2018-09-23 21:40:23,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:23,120 INFO L225 Difference]: With dead ends: 16 [2018-09-23 21:40:23,120 INFO L226 Difference]: Without dead ends: 14 [2018-09-23 21:40:23,121 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2018-09-23 21:40:23,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-09-23 21:40:23,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-09-23 21:40:23,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-09-23 21:40:23,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-09-23 21:40:23,125 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2018-09-23 21:40:23,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:23,125 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-09-23 21:40:23,126 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-23 21:40:23,126 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-09-23 21:40:23,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-09-23 21:40:23,126 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:23,126 INFO L375 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1] [2018-09-23 21:40:23,127 INFO L423 AbstractCegarLoop]: === Iteration 10 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:23,127 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:23,127 INFO L82 PathProgramCache]: Analyzing trace with hash -1786617819, now seen corresponding path program 9 times [2018-09-23 21:40:23,127 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:23,127 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:23,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:23,128 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:23,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:23,137 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:23,137 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:23,138 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:23,146 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:40:23,167 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-09-23 21:40:23,168 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:23,169 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:23,406 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:23,435 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:23,435 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2018-09-23 21:40:23,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-23 21:40:23,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-23 21:40:23,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-23 21:40:23,436 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 13 states. [2018-09-23 21:40:23,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:23,603 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-23 21:40:23,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-23 21:40:23,603 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 13 [2018-09-23 21:40:23,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:23,604 INFO L225 Difference]: With dead ends: 17 [2018-09-23 21:40:23,604 INFO L226 Difference]: Without dead ends: 15 [2018-09-23 21:40:23,605 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2018-09-23 21:40:23,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-23 21:40:23,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-23 21:40:23,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-23 21:40:23,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-23 21:40:23,610 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2018-09-23 21:40:23,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:23,611 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-23 21:40:23,611 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-23 21:40:23,611 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-23 21:40:23,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-23 21:40:23,611 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:23,612 INFO L375 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1] [2018-09-23 21:40:23,612 INFO L423 AbstractCegarLoop]: === Iteration 11 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:23,612 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:23,612 INFO L82 PathProgramCache]: Analyzing trace with hash 449420484, now seen corresponding path program 10 times [2018-09-23 21:40:23,612 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:23,612 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:23,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:23,613 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:23,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:23,623 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:23,623 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:23,623 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:23,636 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:40:23,664 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:40:23,664 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:23,666 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:23,999 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:24,021 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:24,021 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2018-09-23 21:40:24,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-23 21:40:24,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-23 21:40:24,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-23 21:40:24,022 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 14 states. [2018-09-23 21:40:24,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:24,216 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-09-23 21:40:24,217 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-23 21:40:24,217 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2018-09-23 21:40:24,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:24,218 INFO L225 Difference]: With dead ends: 18 [2018-09-23 21:40:24,218 INFO L226 Difference]: Without dead ends: 16 [2018-09-23 21:40:24,219 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2018-09-23 21:40:24,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-09-23 21:40:24,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-09-23 21:40:24,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-09-23 21:40:24,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-09-23 21:40:24,225 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2018-09-23 21:40:24,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:24,225 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-09-23 21:40:24,225 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-23 21:40:24,225 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-09-23 21:40:24,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-09-23 21:40:24,226 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:24,226 INFO L375 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1] [2018-09-23 21:40:24,226 INFO L423 AbstractCegarLoop]: === Iteration 12 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:24,226 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:24,227 INFO L82 PathProgramCache]: Analyzing trace with hash 1047131141, now seen corresponding path program 11 times [2018-09-23 21:40:24,227 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:24,227 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:24,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:24,228 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:24,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:24,238 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:24,238 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:24,238 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:24,258 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:40:24,305 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-09-23 21:40:24,306 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:24,308 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:24,756 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:24,780 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:24,780 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2018-09-23 21:40:24,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-23 21:40:24,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-23 21:40:24,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-23 21:40:24,781 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 15 states. [2018-09-23 21:40:25,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:25,009 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-23 21:40:25,009 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-23 21:40:25,010 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 15 [2018-09-23 21:40:25,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:25,010 INFO L225 Difference]: With dead ends: 19 [2018-09-23 21:40:25,011 INFO L226 Difference]: Without dead ends: 17 [2018-09-23 21:40:25,011 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2018-09-23 21:40:25,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-23 21:40:25,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-23 21:40:25,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-23 21:40:25,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-23 21:40:25,016 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2018-09-23 21:40:25,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:25,016 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-23 21:40:25,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-23 21:40:25,016 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-23 21:40:25,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-23 21:40:25,017 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:25,018 INFO L375 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1] [2018-09-23 21:40:25,018 INFO L423 AbstractCegarLoop]: === Iteration 13 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:25,018 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:25,018 INFO L82 PathProgramCache]: Analyzing trace with hash -1898674972, now seen corresponding path program 12 times [2018-09-23 21:40:25,018 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:25,018 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:25,019 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:25,019 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:25,019 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:25,028 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:25,028 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:25,028 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:25,042 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:40:25,082 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-23 21:40:25,083 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:25,085 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:25,496 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:25,519 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:25,519 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2018-09-23 21:40:25,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-23 21:40:25,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-23 21:40:25,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-23 21:40:25,520 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 16 states. [2018-09-23 21:40:25,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:25,987 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-09-23 21:40:25,987 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-23 21:40:25,988 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 16 [2018-09-23 21:40:25,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:25,988 INFO L225 Difference]: With dead ends: 20 [2018-09-23 21:40:25,988 INFO L226 Difference]: Without dead ends: 18 [2018-09-23 21:40:25,989 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2018-09-23 21:40:25,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-09-23 21:40:25,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-09-23 21:40:25,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-09-23 21:40:25,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-09-23 21:40:25,994 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2018-09-23 21:40:25,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:25,994 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-09-23 21:40:25,994 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-23 21:40:25,994 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-09-23 21:40:25,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-23 21:40:25,995 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:25,995 INFO L375 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1] [2018-09-23 21:40:25,995 INFO L423 AbstractCegarLoop]: === Iteration 14 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:25,996 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:25,996 INFO L82 PathProgramCache]: Analyzing trace with hash 1270616037, now seen corresponding path program 13 times [2018-09-23 21:40:25,996 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:25,996 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:25,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:25,997 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:25,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:26,007 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:26,007 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:26,007 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:26,018 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:26,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:40:26,063 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:26,400 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:26,422 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:26,422 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2018-09-23 21:40:26,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-23 21:40:26,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-23 21:40:26,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-23 21:40:26,423 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 17 states. [2018-09-23 21:40:27,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:27,114 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-23 21:40:27,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-23 21:40:27,115 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 17 [2018-09-23 21:40:27,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:27,116 INFO L225 Difference]: With dead ends: 21 [2018-09-23 21:40:27,116 INFO L226 Difference]: Without dead ends: 19 [2018-09-23 21:40:27,117 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2018-09-23 21:40:27,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-23 21:40:27,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-23 21:40:27,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-23 21:40:27,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-23 21:40:27,122 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2018-09-23 21:40:27,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:27,123 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-23 21:40:27,123 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-23 21:40:27,123 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-23 21:40:27,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-23 21:40:27,123 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:27,124 INFO L375 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1] [2018-09-23 21:40:27,124 INFO L423 AbstractCegarLoop]: === Iteration 15 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:27,124 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:27,124 INFO L82 PathProgramCache]: Analyzing trace with hash 734389508, now seen corresponding path program 14 times [2018-09-23 21:40:27,124 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:27,124 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:27,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:27,125 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:27,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:27,134 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:27,134 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:27,134 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:27,146 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:40:27,201 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:40:27,202 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:27,204 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:27,449 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:27,470 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:27,470 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2018-09-23 21:40:27,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-23 21:40:27,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-23 21:40:27,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-23 21:40:27,471 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 18 states. [2018-09-23 21:40:27,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:27,792 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-09-23 21:40:27,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-23 21:40:27,792 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 18 [2018-09-23 21:40:27,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:27,793 INFO L225 Difference]: With dead ends: 22 [2018-09-23 21:40:27,793 INFO L226 Difference]: Without dead ends: 20 [2018-09-23 21:40:27,794 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2018-09-23 21:40:27,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-09-23 21:40:27,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-09-23 21:40:27,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-09-23 21:40:27,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-09-23 21:40:27,799 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-09-23 21:40:27,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:27,799 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-09-23 21:40:27,799 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-23 21:40:27,799 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-09-23 21:40:27,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-09-23 21:40:27,800 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:27,800 INFO L375 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1] [2018-09-23 21:40:27,800 INFO L423 AbstractCegarLoop]: === Iteration 16 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:27,800 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:27,800 INFO L82 PathProgramCache]: Analyzing trace with hash 1291236293, now seen corresponding path program 15 times [2018-09-23 21:40:27,800 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:27,801 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:27,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:27,801 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:27,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:27,810 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:27,811 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:27,811 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:27,836 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:40:27,937 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-09-23 21:40:27,938 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:27,941 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:29,546 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:29,567 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:29,567 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2018-09-23 21:40:29,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-23 21:40:29,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-23 21:40:29,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-09-23 21:40:29,568 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 19 states. [2018-09-23 21:40:30,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:30,037 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-23 21:40:30,038 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-23 21:40:30,038 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 19 [2018-09-23 21:40:30,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:30,039 INFO L225 Difference]: With dead ends: 23 [2018-09-23 21:40:30,039 INFO L226 Difference]: Without dead ends: 21 [2018-09-23 21:40:30,040 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2018-09-23 21:40:30,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-23 21:40:30,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-23 21:40:30,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-23 21:40:30,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-23 21:40:30,045 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-09-23 21:40:30,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:30,045 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-23 21:40:30,045 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-23 21:40:30,045 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-23 21:40:30,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-23 21:40:30,046 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:30,046 INFO L375 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1] [2018-09-23 21:40:30,046 INFO L423 AbstractCegarLoop]: === Iteration 17 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:30,046 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:30,046 INFO L82 PathProgramCache]: Analyzing trace with hash 1373617444, now seen corresponding path program 16 times [2018-09-23 21:40:30,047 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:30,047 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:30,048 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:30,048 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:30,048 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:30,056 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:30,057 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:30,057 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:30,069 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:40:30,145 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:40:30,146 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:30,148 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:30,506 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:30,527 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:30,527 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2018-09-23 21:40:30,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-23 21:40:30,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-23 21:40:30,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-23 21:40:30,528 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 20 states. [2018-09-23 21:40:30,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:30,899 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-09-23 21:40:30,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-23 21:40:30,900 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 20 [2018-09-23 21:40:30,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:30,900 INFO L225 Difference]: With dead ends: 24 [2018-09-23 21:40:30,901 INFO L226 Difference]: Without dead ends: 22 [2018-09-23 21:40:30,902 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2018-09-23 21:40:30,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-09-23 21:40:30,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-09-23 21:40:30,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-09-23 21:40:30,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-09-23 21:40:30,907 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-09-23 21:40:30,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:30,907 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-09-23 21:40:30,907 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-23 21:40:30,907 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-09-23 21:40:30,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-09-23 21:40:30,908 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:30,908 INFO L375 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1] [2018-09-23 21:40:30,908 INFO L423 AbstractCegarLoop]: === Iteration 18 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:30,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:30,909 INFO L82 PathProgramCache]: Analyzing trace with hash -367534171, now seen corresponding path program 17 times [2018-09-23 21:40:30,909 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:30,909 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:30,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:30,910 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:30,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:30,918 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:30,919 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:30,919 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:30,932 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:40:31,034 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2018-09-23 21:40:31,035 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:31,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:31,439 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:31,460 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:31,460 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2018-09-23 21:40:31,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-09-23 21:40:31,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-09-23 21:40:31,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-09-23 21:40:31,461 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 21 states. [2018-09-23 21:40:32,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:32,046 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-23 21:40:32,047 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-09-23 21:40:32,047 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 21 [2018-09-23 21:40:32,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:32,048 INFO L225 Difference]: With dead ends: 25 [2018-09-23 21:40:32,048 INFO L226 Difference]: Without dead ends: 23 [2018-09-23 21:40:32,049 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2018-09-23 21:40:32,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-23 21:40:32,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-23 21:40:32,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-23 21:40:32,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-23 21:40:32,054 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-09-23 21:40:32,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:32,055 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-23 21:40:32,055 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-09-23 21:40:32,055 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-23 21:40:32,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-23 21:40:32,055 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:32,056 INFO L375 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1] [2018-09-23 21:40:32,056 INFO L423 AbstractCegarLoop]: === Iteration 19 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:32,056 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:32,056 INFO L82 PathProgramCache]: Analyzing trace with hash 1491340612, now seen corresponding path program 18 times [2018-09-23 21:40:32,056 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:32,057 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:32,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:32,058 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:32,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:32,066 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:32,067 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:32,067 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:32,079 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:40:32,196 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2018-09-23 21:40:32,197 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:32,199 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:32,637 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:32,657 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:32,657 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2018-09-23 21:40:32,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-23 21:40:32,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-23 21:40:32,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-09-23 21:40:32,658 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 22 states. [2018-09-23 21:40:33,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:33,080 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-09-23 21:40:33,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-23 21:40:33,081 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 22 [2018-09-23 21:40:33,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:33,082 INFO L225 Difference]: With dead ends: 26 [2018-09-23 21:40:33,082 INFO L226 Difference]: Without dead ends: 24 [2018-09-23 21:40:33,083 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2018-09-23 21:40:33,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-09-23 21:40:33,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-09-23 21:40:33,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-09-23 21:40:33,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-09-23 21:40:33,087 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-09-23 21:40:33,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:33,087 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-09-23 21:40:33,088 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-23 21:40:33,088 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-09-23 21:40:33,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-09-23 21:40:33,088 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:33,088 INFO L375 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1] [2018-09-23 21:40:33,089 INFO L423 AbstractCegarLoop]: === Iteration 20 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:33,089 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:33,089 INFO L82 PathProgramCache]: Analyzing trace with hash -1013083259, now seen corresponding path program 19 times [2018-09-23 21:40:33,089 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:33,089 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:33,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:33,090 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:33,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:33,098 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:33,098 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:33,098 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:33,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:33,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:40:33,256 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:33,647 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:33,668 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:33,668 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2018-09-23 21:40:33,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-09-23 21:40:33,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-09-23 21:40:33,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-09-23 21:40:33,669 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 23 states. [2018-09-23 21:40:34,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:34,295 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-23 21:40:34,296 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-09-23 21:40:34,296 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 23 [2018-09-23 21:40:34,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:34,297 INFO L225 Difference]: With dead ends: 27 [2018-09-23 21:40:34,297 INFO L226 Difference]: Without dead ends: 25 [2018-09-23 21:40:34,298 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2018-09-23 21:40:34,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-23 21:40:34,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-09-23 21:40:34,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-09-23 21:40:34,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-09-23 21:40:34,302 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-09-23 21:40:34,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:34,302 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-09-23 21:40:34,302 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-09-23 21:40:34,302 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-09-23 21:40:34,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-09-23 21:40:34,303 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:34,303 INFO L375 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1] [2018-09-23 21:40:34,303 INFO L423 AbstractCegarLoop]: === Iteration 21 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:34,303 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:34,304 INFO L82 PathProgramCache]: Analyzing trace with hash -1340811932, now seen corresponding path program 20 times [2018-09-23 21:40:34,304 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:34,304 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:34,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:34,305 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:34,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:34,313 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:34,313 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:34,313 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:34,335 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:40:34,490 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:40:34,490 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:34,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:34,943 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:34,963 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:34,963 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2018-09-23 21:40:34,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-09-23 21:40:34,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-09-23 21:40:34,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-09-23 21:40:34,964 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 24 states. [2018-09-23 21:40:35,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:35,436 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-09-23 21:40:35,436 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-09-23 21:40:35,436 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 24 [2018-09-23 21:40:35,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:35,437 INFO L225 Difference]: With dead ends: 28 [2018-09-23 21:40:35,437 INFO L226 Difference]: Without dead ends: 26 [2018-09-23 21:40:35,438 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2018-09-23 21:40:35,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-09-23 21:40:35,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-09-23 21:40:35,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-09-23 21:40:35,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-09-23 21:40:35,443 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-09-23 21:40:35,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:35,443 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-09-23 21:40:35,443 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-09-23 21:40:35,443 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-09-23 21:40:35,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-09-23 21:40:35,444 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:35,444 INFO L375 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1] [2018-09-23 21:40:35,444 INFO L423 AbstractCegarLoop]: === Iteration 22 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:35,444 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:35,444 INFO L82 PathProgramCache]: Analyzing trace with hash 1384501093, now seen corresponding path program 21 times [2018-09-23 21:40:35,445 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:35,445 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:35,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:35,445 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:35,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:35,452 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:35,452 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:35,453 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:35,464 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:40:35,641 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-09-23 21:40:35,641 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:35,644 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:36,389 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:36,409 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:36,410 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2018-09-23 21:40:36,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-09-23 21:40:36,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-09-23 21:40:36,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-09-23 21:40:36,411 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 25 states. [2018-09-23 21:40:37,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:37,232 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-23 21:40:37,236 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-09-23 21:40:37,236 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 25 [2018-09-23 21:40:37,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:37,237 INFO L225 Difference]: With dead ends: 29 [2018-09-23 21:40:37,237 INFO L226 Difference]: Without dead ends: 27 [2018-09-23 21:40:37,237 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2018-09-23 21:40:37,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-23 21:40:37,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-23 21:40:37,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-23 21:40:37,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-23 21:40:37,242 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-09-23 21:40:37,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:37,242 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-23 21:40:37,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-09-23 21:40:37,242 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-23 21:40:37,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-23 21:40:37,243 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:37,243 INFO L375 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1] [2018-09-23 21:40:37,243 INFO L423 AbstractCegarLoop]: === Iteration 23 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:37,243 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:37,244 INFO L82 PathProgramCache]: Analyzing trace with hash -30141052, now seen corresponding path program 22 times [2018-09-23 21:40:37,244 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:37,244 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:37,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:37,244 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:37,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:37,252 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:37,252 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:37,252 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:37,264 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:40:37,457 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:40:37,458 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:37,461 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:37,941 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:37,969 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:37,970 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2018-09-23 21:40:37,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-09-23 21:40:37,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-09-23 21:40:37,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2018-09-23 21:40:37,971 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 26 states. [2018-09-23 21:40:38,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:38,615 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-09-23 21:40:38,615 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-09-23 21:40:38,616 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 26 [2018-09-23 21:40:38,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:38,616 INFO L225 Difference]: With dead ends: 30 [2018-09-23 21:40:38,616 INFO L226 Difference]: Without dead ends: 28 [2018-09-23 21:40:38,617 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2018-09-23 21:40:38,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-09-23 21:40:38,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-09-23 21:40:38,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-09-23 21:40:38,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-09-23 21:40:38,622 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-09-23 21:40:38,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:38,623 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-09-23 21:40:38,623 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-09-23 21:40:38,623 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-09-23 21:40:38,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-09-23 21:40:38,623 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:38,624 INFO L375 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1] [2018-09-23 21:40:38,624 INFO L423 AbstractCegarLoop]: === Iteration 24 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:38,624 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:38,624 INFO L82 PathProgramCache]: Analyzing trace with hash -934374587, now seen corresponding path program 23 times [2018-09-23 21:40:38,624 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:38,624 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:38,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:38,625 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:38,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:38,632 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:38,632 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:38,633 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:38,647 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:40:38,889 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2018-09-23 21:40:38,889 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:38,893 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:39,408 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:39,429 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:39,429 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2018-09-23 21:40:39,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-09-23 21:40:39,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-09-23 21:40:39,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-09-23 21:40:39,430 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 27 states. [2018-09-23 21:40:40,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:40,026 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-23 21:40:40,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-09-23 21:40:40,026 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 27 [2018-09-23 21:40:40,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:40,027 INFO L225 Difference]: With dead ends: 31 [2018-09-23 21:40:40,027 INFO L226 Difference]: Without dead ends: 29 [2018-09-23 21:40:40,028 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2018-09-23 21:40:40,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-23 21:40:40,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-09-23 21:40:40,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-23 21:40:40,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-09-23 21:40:40,033 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-09-23 21:40:40,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:40,033 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-09-23 21:40:40,034 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-09-23 21:40:40,034 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-09-23 21:40:40,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-23 21:40:40,034 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:40,034 INFO L375 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1] [2018-09-23 21:40:40,035 INFO L423 AbstractCegarLoop]: === Iteration 25 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:40,035 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:40,035 INFO L82 PathProgramCache]: Analyzing trace with hash 1099156900, now seen corresponding path program 24 times [2018-09-23 21:40:40,035 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:40,035 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:40,036 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:40,036 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:40,036 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:40,043 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:40,044 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:40,044 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:40,062 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:40:40,327 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-23 21:40:40,327 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:40,330 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:41,429 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:41,449 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:41,449 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2018-09-23 21:40:41,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-09-23 21:40:41,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-09-23 21:40:41,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2018-09-23 21:40:41,451 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 28 states. [2018-09-23 21:40:42,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:42,187 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-09-23 21:40:42,187 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-09-23 21:40:42,187 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 28 [2018-09-23 21:40:42,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:42,188 INFO L225 Difference]: With dead ends: 32 [2018-09-23 21:40:42,188 INFO L226 Difference]: Without dead ends: 30 [2018-09-23 21:40:42,188 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2018-09-23 21:40:42,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-09-23 21:40:42,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-09-23 21:40:42,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-09-23 21:40:42,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-09-23 21:40:42,193 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-09-23 21:40:42,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:42,194 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-09-23 21:40:42,194 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-09-23 21:40:42,194 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-09-23 21:40:42,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-09-23 21:40:42,194 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:42,194 INFO L375 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1] [2018-09-23 21:40:42,195 INFO L423 AbstractCegarLoop]: === Iteration 26 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:42,195 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:42,195 INFO L82 PathProgramCache]: Analyzing trace with hash -285876443, now seen corresponding path program 25 times [2018-09-23 21:40:42,195 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:42,195 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:42,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:42,196 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:42,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:42,202 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:42,203 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:42,203 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:42,218 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:42,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:40:42,548 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:43,074 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:43,095 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:43,095 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2018-09-23 21:40:43,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-09-23 21:40:43,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-09-23 21:40:43,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-09-23 21:40:43,096 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 29 states. [2018-09-23 21:40:43,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:43,813 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-23 21:40:43,813 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-09-23 21:40:43,814 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 29 [2018-09-23 21:40:43,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:43,814 INFO L225 Difference]: With dead ends: 33 [2018-09-23 21:40:43,814 INFO L226 Difference]: Without dead ends: 31 [2018-09-23 21:40:43,815 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2018-09-23 21:40:43,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-23 21:40:43,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-23 21:40:43,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-23 21:40:43,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-09-23 21:40:43,820 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-09-23 21:40:43,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:43,820 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-09-23 21:40:43,820 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-09-23 21:40:43,821 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-09-23 21:40:43,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-23 21:40:43,821 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:43,821 INFO L375 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1] [2018-09-23 21:40:43,821 INFO L423 AbstractCegarLoop]: === Iteration 27 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:43,821 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:43,821 INFO L82 PathProgramCache]: Analyzing trace with hash -272237116, now seen corresponding path program 26 times [2018-09-23 21:40:43,822 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:43,822 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:43,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:43,822 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:43,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:43,828 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:43,828 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:43,829 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:43,844 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:40:44,220 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:40:44,220 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:44,223 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:45,877 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:45,897 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:45,897 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2018-09-23 21:40:45,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-09-23 21:40:45,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-09-23 21:40:45,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2018-09-23 21:40:45,898 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 30 states. [2018-09-23 21:40:46,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:46,569 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-09-23 21:40:46,569 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-09-23 21:40:46,569 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 30 [2018-09-23 21:40:46,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:46,570 INFO L225 Difference]: With dead ends: 34 [2018-09-23 21:40:46,570 INFO L226 Difference]: Without dead ends: 32 [2018-09-23 21:40:46,571 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2018-09-23 21:40:46,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-09-23 21:40:46,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-09-23 21:40:46,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-09-23 21:40:46,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-09-23 21:40:46,577 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-09-23 21:40:46,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:46,577 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-09-23 21:40:46,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-09-23 21:40:46,577 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-09-23 21:40:46,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-09-23 21:40:46,578 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:46,578 INFO L375 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1] [2018-09-23 21:40:46,578 INFO L423 AbstractCegarLoop]: === Iteration 28 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:46,578 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:46,578 INFO L82 PathProgramCache]: Analyzing trace with hash 150582021, now seen corresponding path program 27 times [2018-09-23 21:40:46,578 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:46,579 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:46,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:46,579 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:46,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:46,586 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:46,587 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:46,587 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:46,604 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:40:47,050 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-09-23 21:40:47,051 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:47,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:47,784 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:47,804 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:47,804 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2018-09-23 21:40:47,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-09-23 21:40:47,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-09-23 21:40:47,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-09-23 21:40:47,805 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 31 states. [2018-09-23 21:40:48,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:48,547 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-23 21:40:48,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-09-23 21:40:48,548 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 31 [2018-09-23 21:40:48,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:48,549 INFO L225 Difference]: With dead ends: 35 [2018-09-23 21:40:48,549 INFO L226 Difference]: Without dead ends: 33 [2018-09-23 21:40:48,550 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2018-09-23 21:40:48,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-23 21:40:48,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-23 21:40:48,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-23 21:40:48,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-23 21:40:48,556 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-09-23 21:40:48,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:48,556 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-23 21:40:48,556 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-09-23 21:40:48,556 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-23 21:40:48,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-23 21:40:48,556 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:48,557 INFO L375 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1] [2018-09-23 21:40:48,557 INFO L423 AbstractCegarLoop]: === Iteration 29 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:48,557 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:48,557 INFO L82 PathProgramCache]: Analyzing trace with hash 373073380, now seen corresponding path program 28 times [2018-09-23 21:40:48,557 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:48,558 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:48,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:48,558 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:48,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:48,565 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:48,566 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:48,566 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:48,585 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:40:49,090 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:40:49,091 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:49,096 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:49,716 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:49,736 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:49,736 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2018-09-23 21:40:49,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-09-23 21:40:49,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-09-23 21:40:49,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2018-09-23 21:40:49,737 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 32 states. [2018-09-23 21:40:50,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:50,490 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-09-23 21:40:50,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-09-23 21:40:50,491 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 32 [2018-09-23 21:40:50,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:50,491 INFO L225 Difference]: With dead ends: 36 [2018-09-23 21:40:50,492 INFO L226 Difference]: Without dead ends: 34 [2018-09-23 21:40:50,493 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2018-09-23 21:40:50,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-09-23 21:40:50,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-09-23 21:40:50,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-09-23 21:40:50,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-09-23 21:40:50,498 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2018-09-23 21:40:50,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:50,498 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-09-23 21:40:50,498 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-09-23 21:40:50,499 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-09-23 21:40:50,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-09-23 21:40:50,499 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:50,499 INFO L375 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1] [2018-09-23 21:40:50,499 INFO L423 AbstractCegarLoop]: === Iteration 30 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:50,500 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:50,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1319629083, now seen corresponding path program 29 times [2018-09-23 21:40:50,500 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:50,500 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:50,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:50,501 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:50,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:50,507 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:50,507 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:50,507 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:50,524 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:40:51,027 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2018-09-23 21:40:51,027 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:51,032 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:51,741 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:51,761 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:51,762 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2018-09-23 21:40:51,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-09-23 21:40:51,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-09-23 21:40:51,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2018-09-23 21:40:51,763 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 33 states. [2018-09-23 21:40:52,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:52,665 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-23 21:40:52,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-09-23 21:40:52,666 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 33 [2018-09-23 21:40:52,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:52,667 INFO L225 Difference]: With dead ends: 37 [2018-09-23 21:40:52,667 INFO L226 Difference]: Without dead ends: 35 [2018-09-23 21:40:52,668 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2018-09-23 21:40:52,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-23 21:40:52,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-23 21:40:52,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-23 21:40:52,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-09-23 21:40:52,672 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2018-09-23 21:40:52,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:52,672 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-09-23 21:40:52,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-09-23 21:40:52,672 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-09-23 21:40:52,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-23 21:40:52,673 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:52,673 INFO L375 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1] [2018-09-23 21:40:52,673 INFO L423 AbstractCegarLoop]: === Iteration 31 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:52,673 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:52,673 INFO L82 PathProgramCache]: Analyzing trace with hash 2041169412, now seen corresponding path program 30 times [2018-09-23 21:40:52,673 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:52,673 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:52,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:52,674 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:52,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:52,680 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:52,681 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:52,681 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:52,705 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:40:53,518 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2018-09-23 21:40:53,518 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:53,521 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:54,247 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:54,267 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:54,267 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2018-09-23 21:40:54,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-09-23 21:40:54,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-09-23 21:40:54,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2018-09-23 21:40:54,268 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 34 states. [2018-09-23 21:40:55,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:55,135 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-09-23 21:40:55,135 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-09-23 21:40:55,135 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 34 [2018-09-23 21:40:55,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:55,136 INFO L225 Difference]: With dead ends: 38 [2018-09-23 21:40:55,136 INFO L226 Difference]: Without dead ends: 36 [2018-09-23 21:40:55,137 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2018-09-23 21:40:55,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-09-23 21:40:55,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-09-23 21:40:55,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-09-23 21:40:55,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-09-23 21:40:55,142 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2018-09-23 21:40:55,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:55,143 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-09-23 21:40:55,143 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-09-23 21:40:55,143 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-09-23 21:40:55,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-09-23 21:40:55,143 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:55,143 INFO L375 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1] [2018-09-23 21:40:55,144 INFO L423 AbstractCegarLoop]: === Iteration 32 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:55,144 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:55,144 INFO L82 PathProgramCache]: Analyzing trace with hash -1148259643, now seen corresponding path program 31 times [2018-09-23 21:40:55,144 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:55,144 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:55,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:55,145 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:40:55,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:55,152 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:55,152 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:55,152 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:55,178 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:55,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:40:55,813 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:56,693 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:56,713 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:56,714 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2018-09-23 21:40:56,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-09-23 21:40:56,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-09-23 21:40:56,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2018-09-23 21:40:56,715 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 35 states. [2018-09-23 21:40:57,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:40:57,754 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-23 21:40:57,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-09-23 21:40:57,754 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 35 [2018-09-23 21:40:57,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:40:57,755 INFO L225 Difference]: With dead ends: 39 [2018-09-23 21:40:57,755 INFO L226 Difference]: Without dead ends: 37 [2018-09-23 21:40:57,756 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2018-09-23 21:40:57,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-23 21:40:57,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-09-23 21:40:57,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-09-23 21:40:57,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-09-23 21:40:57,761 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2018-09-23 21:40:57,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:40:57,762 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-09-23 21:40:57,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-09-23 21:40:57,762 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-09-23 21:40:57,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-09-23 21:40:57,762 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:40:57,762 INFO L375 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1] [2018-09-23 21:40:57,763 INFO L423 AbstractCegarLoop]: === Iteration 33 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:40:57,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:40:57,763 INFO L82 PathProgramCache]: Analyzing trace with hash -1236312540, now seen corresponding path program 32 times [2018-09-23 21:40:57,763 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:40:57,763 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:40:57,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:57,764 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:40:57,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:40:57,769 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:40:57,769 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:40:57,769 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:40:57,783 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:40:58,459 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:40:58,459 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:40:58,463 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:40:59,218 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:40:59,239 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:40:59,239 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2018-09-23 21:40:59,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-09-23 21:40:59,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-09-23 21:40:59,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2018-09-23 21:40:59,240 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 36 states. [2018-09-23 21:41:00,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:00,188 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-09-23 21:41:00,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-09-23 21:41:00,189 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 36 [2018-09-23 21:41:00,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:00,189 INFO L225 Difference]: With dead ends: 40 [2018-09-23 21:41:00,189 INFO L226 Difference]: Without dead ends: 38 [2018-09-23 21:41:00,191 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2018-09-23 21:41:00,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-09-23 21:41:00,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-09-23 21:41:00,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-09-23 21:41:00,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-09-23 21:41:00,195 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2018-09-23 21:41:00,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:00,195 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-09-23 21:41:00,195 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-09-23 21:41:00,195 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-09-23 21:41:00,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-09-23 21:41:00,196 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:00,196 INFO L375 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1] [2018-09-23 21:41:00,196 INFO L423 AbstractCegarLoop]: === Iteration 34 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:00,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:00,196 INFO L82 PathProgramCache]: Analyzing trace with hash 329014949, now seen corresponding path program 33 times [2018-09-23 21:41:00,197 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:00,197 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:00,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:00,197 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:41:00,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:00,203 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:00,204 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:00,204 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:00,219 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:41:00,911 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-09-23 21:41:00,912 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:41:00,915 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:01,756 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:01,775 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:01,776 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2018-09-23 21:41:01,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-09-23 21:41:01,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-09-23 21:41:01,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2018-09-23 21:41:01,777 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 37 states. [2018-09-23 21:41:02,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:02,832 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-23 21:41:02,832 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-09-23 21:41:02,832 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 37 [2018-09-23 21:41:02,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:02,833 INFO L225 Difference]: With dead ends: 41 [2018-09-23 21:41:02,833 INFO L226 Difference]: Without dead ends: 39 [2018-09-23 21:41:02,834 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2018-09-23 21:41:02,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-23 21:41:02,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-23 21:41:02,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-23 21:41:02,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-09-23 21:41:02,838 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2018-09-23 21:41:02,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:02,838 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-09-23 21:41:02,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-09-23 21:41:02,838 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-09-23 21:41:02,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-23 21:41:02,839 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:02,839 INFO L375 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1] [2018-09-23 21:41:02,839 INFO L423 AbstractCegarLoop]: === Iteration 35 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:02,839 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:02,840 INFO L82 PathProgramCache]: Analyzing trace with hash 1609526852, now seen corresponding path program 34 times [2018-09-23 21:41:02,840 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:02,840 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:02,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:02,840 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:41:02,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:02,846 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:02,846 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:02,846 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:02,863 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:41:03,611 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:41:03,611 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:41:03,618 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:04,445 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:04,465 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:04,465 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2018-09-23 21:41:04,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-09-23 21:41:04,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-09-23 21:41:04,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2018-09-23 21:41:04,466 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 38 states. [2018-09-23 21:41:05,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:05,528 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-09-23 21:41:05,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-09-23 21:41:05,528 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 38 [2018-09-23 21:41:05,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:05,529 INFO L225 Difference]: With dead ends: 42 [2018-09-23 21:41:05,529 INFO L226 Difference]: Without dead ends: 40 [2018-09-23 21:41:05,531 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2018-09-23 21:41:05,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-09-23 21:41:05,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-09-23 21:41:05,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-09-23 21:41:05,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-09-23 21:41:05,541 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2018-09-23 21:41:05,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:05,541 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-09-23 21:41:05,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-09-23 21:41:05,541 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-09-23 21:41:05,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-09-23 21:41:05,542 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:05,542 INFO L375 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1] [2018-09-23 21:41:05,542 INFO L423 AbstractCegarLoop]: === Iteration 36 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:05,542 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:05,542 INFO L82 PathProgramCache]: Analyzing trace with hash -1644277115, now seen corresponding path program 35 times [2018-09-23 21:41:05,542 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:05,543 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:05,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:05,543 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:41:05,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:05,550 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:05,551 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:05,551 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:05,564 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:41:06,516 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2018-09-23 21:41:06,516 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:41:06,522 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:07,611 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:07,631 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:07,631 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2018-09-23 21:41:07,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-09-23 21:41:07,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-09-23 21:41:07,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2018-09-23 21:41:07,632 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 39 states. [2018-09-23 21:41:08,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:08,769 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-09-23 21:41:08,769 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-09-23 21:41:08,769 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 39 [2018-09-23 21:41:08,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:08,770 INFO L225 Difference]: With dead ends: 43 [2018-09-23 21:41:08,770 INFO L226 Difference]: Without dead ends: 41 [2018-09-23 21:41:08,771 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2018-09-23 21:41:08,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-09-23 21:41:08,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-09-23 21:41:08,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-09-23 21:41:08,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-09-23 21:41:08,774 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2018-09-23 21:41:08,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:08,775 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-09-23 21:41:08,775 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-09-23 21:41:08,775 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-09-23 21:41:08,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-09-23 21:41:08,775 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:08,775 INFO L375 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1] [2018-09-23 21:41:08,775 INFO L423 AbstractCegarLoop]: === Iteration 37 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:08,775 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:08,776 INFO L82 PathProgramCache]: Analyzing trace with hash 567015012, now seen corresponding path program 36 times [2018-09-23 21:41:08,776 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:08,776 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:08,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:08,776 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:41:08,777 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:08,782 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:08,782 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:08,782 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:08,793 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:41:09,537 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-23 21:41:09,537 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:41:09,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:10,467 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:10,487 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:10,487 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2018-09-23 21:41:10,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-09-23 21:41:10,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-09-23 21:41:10,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2018-09-23 21:41:10,488 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 40 states. [2018-09-23 21:41:11,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:11,718 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-09-23 21:41:11,718 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-09-23 21:41:11,718 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 40 [2018-09-23 21:41:11,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:11,719 INFO L225 Difference]: With dead ends: 44 [2018-09-23 21:41:11,719 INFO L226 Difference]: Without dead ends: 42 [2018-09-23 21:41:11,720 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2018-09-23 21:41:11,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-09-23 21:41:11,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-09-23 21:41:11,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-09-23 21:41:11,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-09-23 21:41:11,724 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2018-09-23 21:41:11,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:11,724 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-09-23 21:41:11,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-09-23 21:41:11,725 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-09-23 21:41:11,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-09-23 21:41:11,725 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:11,725 INFO L375 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1] [2018-09-23 21:41:11,725 INFO L423 AbstractCegarLoop]: === Iteration 38 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:11,726 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:11,726 INFO L82 PathProgramCache]: Analyzing trace with hash 397594213, now seen corresponding path program 37 times [2018-09-23 21:41:11,726 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:11,726 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:11,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:11,727 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:41:11,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:11,732 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:11,732 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:11,733 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:11,748 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:41:12,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:41:12,759 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:13,793 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:13,812 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:13,813 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2018-09-23 21:41:13,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-09-23 21:41:13,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-09-23 21:41:13,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2018-09-23 21:41:13,814 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 41 states. [2018-09-23 21:41:15,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:15,055 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-09-23 21:41:15,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-09-23 21:41:15,055 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 41 [2018-09-23 21:41:15,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:15,056 INFO L225 Difference]: With dead ends: 45 [2018-09-23 21:41:15,056 INFO L226 Difference]: Without dead ends: 43 [2018-09-23 21:41:15,057 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2018-09-23 21:41:15,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-09-23 21:41:15,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-09-23 21:41:15,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-09-23 21:41:15,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-09-23 21:41:15,061 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2018-09-23 21:41:15,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:15,061 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-09-23 21:41:15,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-09-23 21:41:15,061 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-09-23 21:41:15,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-09-23 21:41:15,061 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:15,062 INFO L375 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1] [2018-09-23 21:41:15,062 INFO L423 AbstractCegarLoop]: === Iteration 39 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:15,062 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:15,062 INFO L82 PathProgramCache]: Analyzing trace with hash -559483260, now seen corresponding path program 38 times [2018-09-23 21:41:15,062 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:15,062 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:15,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:15,063 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:41:15,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:15,069 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:15,069 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:15,069 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:15,083 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:41:16,060 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:41:16,060 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:41:16,066 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:17,152 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:17,171 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:17,172 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2018-09-23 21:41:17,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-09-23 21:41:17,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-09-23 21:41:17,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2018-09-23 21:41:17,173 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 42 states. [2018-09-23 21:41:18,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:18,490 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-09-23 21:41:18,490 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-09-23 21:41:18,491 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 42 [2018-09-23 21:41:18,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:18,491 INFO L225 Difference]: With dead ends: 46 [2018-09-23 21:41:18,491 INFO L226 Difference]: Without dead ends: 44 [2018-09-23 21:41:18,492 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2018-09-23 21:41:18,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-09-23 21:41:18,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-09-23 21:41:18,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-09-23 21:41:18,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-09-23 21:41:18,496 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2018-09-23 21:41:18,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:18,497 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-09-23 21:41:18,497 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-09-23 21:41:18,497 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-09-23 21:41:18,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-09-23 21:41:18,497 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:18,497 INFO L375 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1] [2018-09-23 21:41:18,497 INFO L423 AbstractCegarLoop]: === Iteration 40 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:18,498 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:18,498 INFO L82 PathProgramCache]: Analyzing trace with hash -164113851, now seen corresponding path program 39 times [2018-09-23 21:41:18,498 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:18,498 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:18,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:18,498 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:41:18,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:18,504 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:18,505 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:18,505 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:18,523 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:41:19,704 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-09-23 21:41:19,704 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:41:19,708 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:20,789 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:20,811 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:20,811 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2018-09-23 21:41:20,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-09-23 21:41:20,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-09-23 21:41:20,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2018-09-23 21:41:20,812 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 43 states. [2018-09-23 21:41:22,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:22,166 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-09-23 21:41:22,166 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-09-23 21:41:22,166 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 43 [2018-09-23 21:41:22,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:22,167 INFO L225 Difference]: With dead ends: 47 [2018-09-23 21:41:22,167 INFO L226 Difference]: Without dead ends: 45 [2018-09-23 21:41:22,168 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2018-09-23 21:41:22,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-09-23 21:41:22,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-09-23 21:41:22,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-09-23 21:41:22,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-09-23 21:41:22,172 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2018-09-23 21:41:22,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:22,172 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-09-23 21:41:22,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-09-23 21:41:22,172 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-09-23 21:41:22,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-09-23 21:41:22,173 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:22,173 INFO L375 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1] [2018-09-23 21:41:22,173 INFO L423 AbstractCegarLoop]: === Iteration 41 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:22,173 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:22,173 INFO L82 PathProgramCache]: Analyzing trace with hash -792564060, now seen corresponding path program 40 times [2018-09-23 21:41:22,173 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:22,173 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:22,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:22,174 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:41:22,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:22,180 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:22,180 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:22,180 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:22,194 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:41:23,754 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:41:23,755 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:41:23,763 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:24,909 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:24,929 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:24,929 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2018-09-23 21:41:24,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-09-23 21:41:24,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-09-23 21:41:24,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2018-09-23 21:41:24,930 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 44 states. [2018-09-23 21:41:26,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:26,383 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-09-23 21:41:26,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-09-23 21:41:26,384 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 44 [2018-09-23 21:41:26,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:26,385 INFO L225 Difference]: With dead ends: 48 [2018-09-23 21:41:26,385 INFO L226 Difference]: Without dead ends: 46 [2018-09-23 21:41:26,386 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=89, Invalid=1891, Unknown=0, NotChecked=0, Total=1980 [2018-09-23 21:41:26,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-09-23 21:41:26,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-09-23 21:41:26,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-09-23 21:41:26,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-09-23 21:41:26,389 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2018-09-23 21:41:26,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:26,389 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-09-23 21:41:26,390 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-09-23 21:41:26,390 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-09-23 21:41:26,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-09-23 21:41:26,390 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:26,390 INFO L375 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1] [2018-09-23 21:41:26,390 INFO L423 AbstractCegarLoop]: === Iteration 42 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:26,390 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:26,391 INFO L82 PathProgramCache]: Analyzing trace with hash 1200315941, now seen corresponding path program 41 times [2018-09-23 21:41:26,391 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:26,391 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:26,391 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:26,391 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:41:26,391 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:26,397 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:26,398 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:26,398 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:26,412 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:41:27,938 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2018-09-23 21:41:27,938 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:41:27,948 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:29,044 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:29,064 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:29,064 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2018-09-23 21:41:29,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-09-23 21:41:29,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-09-23 21:41:29,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2018-09-23 21:41:29,066 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 45 states. [2018-09-23 21:41:30,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:30,540 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-09-23 21:41:30,540 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-09-23 21:41:30,540 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 45 [2018-09-23 21:41:30,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:30,541 INFO L225 Difference]: With dead ends: 49 [2018-09-23 21:41:30,541 INFO L226 Difference]: Without dead ends: 47 [2018-09-23 21:41:30,542 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=91, Invalid=1979, Unknown=0, NotChecked=0, Total=2070 [2018-09-23 21:41:30,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-09-23 21:41:30,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-09-23 21:41:30,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-09-23 21:41:30,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-09-23 21:41:30,546 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2018-09-23 21:41:30,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:30,547 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-09-23 21:41:30,547 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-09-23 21:41:30,547 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-09-23 21:41:30,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-09-23 21:41:30,547 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:30,547 INFO L375 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1] [2018-09-23 21:41:30,547 INFO L423 AbstractCegarLoop]: === Iteration 43 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:30,547 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:30,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1444913468, now seen corresponding path program 42 times [2018-09-23 21:41:30,548 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:30,548 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:30,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:30,548 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:41:30,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:30,554 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:30,554 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:30,554 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:30,569 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:41:32,329 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2018-09-23 21:41:32,330 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:41:32,335 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:33,540 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:33,560 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:33,560 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2018-09-23 21:41:33,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-09-23 21:41:33,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-09-23 21:41:33,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1981, Unknown=0, NotChecked=0, Total=2070 [2018-09-23 21:41:33,561 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 46 states. [2018-09-23 21:41:35,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:35,055 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-09-23 21:41:35,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-09-23 21:41:35,056 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 46 [2018-09-23 21:41:35,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:35,057 INFO L225 Difference]: With dead ends: 50 [2018-09-23 21:41:35,057 INFO L226 Difference]: Without dead ends: 48 [2018-09-23 21:41:35,057 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=93, Invalid=2069, Unknown=0, NotChecked=0, Total=2162 [2018-09-23 21:41:35,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-09-23 21:41:35,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-09-23 21:41:35,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-09-23 21:41:35,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-09-23 21:41:35,062 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2018-09-23 21:41:35,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:35,062 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-09-23 21:41:35,062 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-09-23 21:41:35,062 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-09-23 21:41:35,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-09-23 21:41:35,062 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:35,063 INFO L375 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1] [2018-09-23 21:41:35,063 INFO L423 AbstractCegarLoop]: === Iteration 44 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:35,063 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:35,063 INFO L82 PathProgramCache]: Analyzing trace with hash -1842646523, now seen corresponding path program 43 times [2018-09-23 21:41:35,063 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:35,063 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:35,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:35,064 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:41:35,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:35,070 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:35,070 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:35,070 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:35,084 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:41:36,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:41:36,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:38,057 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:38,077 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:38,077 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2018-09-23 21:41:38,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-09-23 21:41:38,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-09-23 21:41:38,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=2071, Unknown=0, NotChecked=0, Total=2162 [2018-09-23 21:41:38,078 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 47 states. [2018-09-23 21:41:39,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:39,644 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-09-23 21:41:39,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-09-23 21:41:39,644 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 47 [2018-09-23 21:41:39,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:39,645 INFO L225 Difference]: With dead ends: 51 [2018-09-23 21:41:39,645 INFO L226 Difference]: Without dead ends: 49 [2018-09-23 21:41:39,646 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=95, Invalid=2161, Unknown=0, NotChecked=0, Total=2256 [2018-09-23 21:41:39,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-09-23 21:41:39,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-09-23 21:41:39,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-09-23 21:41:39,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-09-23 21:41:39,650 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2018-09-23 21:41:39,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:39,651 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-09-23 21:41:39,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-09-23 21:41:39,651 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-09-23 21:41:39,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-09-23 21:41:39,651 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:39,651 INFO L375 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1] [2018-09-23 21:41:39,652 INFO L423 AbstractCegarLoop]: === Iteration 45 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:39,652 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:39,652 INFO L82 PathProgramCache]: Analyzing trace with hash -1287469340, now seen corresponding path program 44 times [2018-09-23 21:41:39,652 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:39,652 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:39,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:39,653 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:41:39,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:39,659 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:39,659 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:39,659 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:39,672 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:41:41,351 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:41:41,351 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:41:41,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:42,612 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:42,632 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:42,632 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2018-09-23 21:41:42,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-09-23 21:41:42,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-09-23 21:41:42,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=2163, Unknown=0, NotChecked=0, Total=2256 [2018-09-23 21:41:42,633 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 48 states. [2018-09-23 21:41:44,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:44,250 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-09-23 21:41:44,250 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-09-23 21:41:44,251 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 48 [2018-09-23 21:41:44,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:44,251 INFO L225 Difference]: With dead ends: 52 [2018-09-23 21:41:44,251 INFO L226 Difference]: Without dead ends: 50 [2018-09-23 21:41:44,252 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=97, Invalid=2255, Unknown=0, NotChecked=0, Total=2352 [2018-09-23 21:41:44,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-09-23 21:41:44,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-09-23 21:41:44,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-09-23 21:41:44,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-09-23 21:41:44,256 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2018-09-23 21:41:44,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:44,256 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-09-23 21:41:44,256 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-09-23 21:41:44,256 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-09-23 21:41:44,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-09-23 21:41:44,257 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:44,257 INFO L375 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1] [2018-09-23 21:41:44,257 INFO L423 AbstractCegarLoop]: === Iteration 46 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:44,257 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:44,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1256845851, now seen corresponding path program 45 times [2018-09-23 21:41:44,258 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:44,258 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:44,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:44,258 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:41:44,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:44,264 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:44,264 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:44,264 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:44,271 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:41:46,378 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-09-23 21:41:46,378 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:41:46,384 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:47,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:47,723 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:47,723 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2018-09-23 21:41:47,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-09-23 21:41:47,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-09-23 21:41:47,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=2257, Unknown=0, NotChecked=0, Total=2352 [2018-09-23 21:41:47,724 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 49 states. [2018-09-23 21:41:49,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:49,434 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-09-23 21:41:49,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-09-23 21:41:49,435 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 49 [2018-09-23 21:41:49,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:49,435 INFO L225 Difference]: With dead ends: 53 [2018-09-23 21:41:49,436 INFO L226 Difference]: Without dead ends: 51 [2018-09-23 21:41:49,436 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=99, Invalid=2351, Unknown=0, NotChecked=0, Total=2450 [2018-09-23 21:41:49,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-09-23 21:41:49,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-09-23 21:41:49,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-09-23 21:41:49,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-09-23 21:41:49,440 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2018-09-23 21:41:49,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:49,441 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-09-23 21:41:49,441 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-09-23 21:41:49,441 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-09-23 21:41:49,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-09-23 21:41:49,441 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:49,442 INFO L375 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1] [2018-09-23 21:41:49,442 INFO L423 AbstractCegarLoop]: === Iteration 47 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:49,442 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:49,442 INFO L82 PathProgramCache]: Analyzing trace with hash -307517692, now seen corresponding path program 46 times [2018-09-23 21:41:49,442 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:49,442 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:49,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:49,443 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:41:49,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:49,449 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:49,449 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:49,449 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:49,465 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:41:52,021 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:41:52,021 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:41:52,031 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:53,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:53,416 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:53,416 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2018-09-23 21:41:53,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-09-23 21:41:53,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-09-23 21:41:53,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=2353, Unknown=0, NotChecked=0, Total=2450 [2018-09-23 21:41:53,417 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 50 states. [2018-09-23 21:41:55,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:41:55,179 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-09-23 21:41:55,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-09-23 21:41:55,180 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 50 [2018-09-23 21:41:55,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:41:55,180 INFO L225 Difference]: With dead ends: 54 [2018-09-23 21:41:55,181 INFO L226 Difference]: Without dead ends: 52 [2018-09-23 21:41:55,181 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=101, Invalid=2449, Unknown=0, NotChecked=0, Total=2550 [2018-09-23 21:41:55,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-09-23 21:41:55,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-09-23 21:41:55,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-09-23 21:41:55,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-09-23 21:41:55,186 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2018-09-23 21:41:55,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:41:55,186 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-09-23 21:41:55,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-09-23 21:41:55,186 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-09-23 21:41:55,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-09-23 21:41:55,187 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:41:55,187 INFO L375 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1] [2018-09-23 21:41:55,187 INFO L423 AbstractCegarLoop]: === Iteration 48 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:41:55,187 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:41:55,187 INFO L82 PathProgramCache]: Analyzing trace with hash -943115835, now seen corresponding path program 47 times [2018-09-23 21:41:55,187 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:41:55,187 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:41:55,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:55,188 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:41:55,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:41:55,194 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:41:55,194 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:41:55,194 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:41:55,203 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:41:57,835 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2018-09-23 21:41:57,835 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:41:57,845 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:41:59,287 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:41:59,308 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:41:59,308 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2018-09-23 21:41:59,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-09-23 21:41:59,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-09-23 21:41:59,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=2451, Unknown=0, NotChecked=0, Total=2550 [2018-09-23 21:41:59,309 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 51 states. [2018-09-23 21:42:01,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:42:01,145 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-09-23 21:42:01,145 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-09-23 21:42:01,145 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 51 [2018-09-23 21:42:01,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:42:01,146 INFO L225 Difference]: With dead ends: 55 [2018-09-23 21:42:01,146 INFO L226 Difference]: Without dead ends: 53 [2018-09-23 21:42:01,147 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=103, Invalid=2549, Unknown=0, NotChecked=0, Total=2652 [2018-09-23 21:42:01,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-09-23 21:42:01,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-09-23 21:42:01,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-09-23 21:42:01,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-09-23 21:42:01,152 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2018-09-23 21:42:01,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:42:01,152 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-09-23 21:42:01,152 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-09-23 21:42:01,152 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-09-23 21:42:01,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-09-23 21:42:01,152 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:42:01,152 INFO L375 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1] [2018-09-23 21:42:01,153 INFO L423 AbstractCegarLoop]: === Iteration 49 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:42:01,153 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:42:01,153 INFO L82 PathProgramCache]: Analyzing trace with hash 828178212, now seen corresponding path program 48 times [2018-09-23 21:42:01,153 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:42:01,153 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:42:01,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:01,154 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:42:01,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:01,159 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:42:01,159 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:42:01,160 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:42:01,173 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:42:03,912 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-09-23 21:42:03,912 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:42:03,919 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:42:05,381 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:42:05,401 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:42:05,401 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2018-09-23 21:42:05,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-09-23 21:42:05,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-09-23 21:42:05,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=2551, Unknown=0, NotChecked=0, Total=2652 [2018-09-23 21:42:05,402 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 52 states. [2018-09-23 21:42:07,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:42:07,302 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-09-23 21:42:07,302 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-09-23 21:42:07,302 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 52 [2018-09-23 21:42:07,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:42:07,303 INFO L225 Difference]: With dead ends: 56 [2018-09-23 21:42:07,303 INFO L226 Difference]: Without dead ends: 54 [2018-09-23 21:42:07,304 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=105, Invalid=2651, Unknown=0, NotChecked=0, Total=2756 [2018-09-23 21:42:07,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-09-23 21:42:07,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-09-23 21:42:07,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-09-23 21:42:07,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-09-23 21:42:07,308 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2018-09-23 21:42:07,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:42:07,309 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-09-23 21:42:07,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-09-23 21:42:07,309 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-09-23 21:42:07,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-09-23 21:42:07,309 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:42:07,309 INFO L375 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1] [2018-09-23 21:42:07,309 INFO L423 AbstractCegarLoop]: === Iteration 50 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:42:07,310 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:42:07,310 INFO L82 PathProgramCache]: Analyzing trace with hash -96281179, now seen corresponding path program 49 times [2018-09-23 21:42:07,310 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:42:07,310 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:42:07,310 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:07,311 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:42:07,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:07,317 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:42:07,317 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:42:07,317 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:42:07,326 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:42:09,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:42:09,900 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:42:11,492 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:42:11,512 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:42:11,512 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2018-09-23 21:42:11,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-09-23 21:42:11,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-09-23 21:42:11,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=2653, Unknown=0, NotChecked=0, Total=2756 [2018-09-23 21:42:11,513 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 53 states. [2018-09-23 21:42:13,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:42:13,483 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-09-23 21:42:13,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-09-23 21:42:13,484 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 53 [2018-09-23 21:42:13,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:42:13,485 INFO L225 Difference]: With dead ends: 57 [2018-09-23 21:42:13,485 INFO L226 Difference]: Without dead ends: 55 [2018-09-23 21:42:13,486 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=107, Invalid=2755, Unknown=0, NotChecked=0, Total=2862 [2018-09-23 21:42:13,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-09-23 21:42:13,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-09-23 21:42:13,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-09-23 21:42:13,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-09-23 21:42:13,492 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2018-09-23 21:42:13,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:42:13,492 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-09-23 21:42:13,492 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-09-23 21:42:13,492 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-09-23 21:42:13,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-09-23 21:42:13,493 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:42:13,493 INFO L375 BasicCegarLoop]: trace histogram [50, 1, 1, 1, 1] [2018-09-23 21:42:13,493 INFO L423 AbstractCegarLoop]: === Iteration 51 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:42:13,493 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:42:13,493 INFO L82 PathProgramCache]: Analyzing trace with hash 1310248772, now seen corresponding path program 50 times [2018-09-23 21:42:13,493 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:42:13,494 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:42:13,494 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:13,494 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:42:13,494 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:13,500 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:42:13,500 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:42:13,500 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:42:13,515 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:42:16,170 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:42:16,170 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:42:16,181 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:42:17,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:42:17,816 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:42:17,816 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2018-09-23 21:42:17,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-09-23 21:42:17,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-09-23 21:42:17,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=2757, Unknown=0, NotChecked=0, Total=2862 [2018-09-23 21:42:17,817 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 54 states. [2018-09-23 21:42:19,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:42:19,882 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-09-23 21:42:19,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-09-23 21:42:19,883 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 54 [2018-09-23 21:42:19,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:42:19,884 INFO L225 Difference]: With dead ends: 58 [2018-09-23 21:42:19,884 INFO L226 Difference]: Without dead ends: 56 [2018-09-23 21:42:19,885 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=109, Invalid=2861, Unknown=0, NotChecked=0, Total=2970 [2018-09-23 21:42:19,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-09-23 21:42:19,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-09-23 21:42:19,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-09-23 21:42:19,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-09-23 21:42:19,889 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2018-09-23 21:42:19,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:42:19,889 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-09-23 21:42:19,889 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-09-23 21:42:19,889 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-09-23 21:42:19,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-09-23 21:42:19,889 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:42:19,890 INFO L375 BasicCegarLoop]: trace histogram [51, 1, 1, 1, 1] [2018-09-23 21:42:19,890 INFO L423 AbstractCegarLoop]: === Iteration 52 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:42:19,890 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:42:19,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1963004293, now seen corresponding path program 51 times [2018-09-23 21:42:19,890 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:42:19,890 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:42:19,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:19,892 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:42:19,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:19,898 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:42:19,898 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:42:19,898 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:42:19,913 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:42:23,129 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-09-23 21:42:23,129 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:42:23,136 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:42:24,733 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:42:24,752 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:42:24,752 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2018-09-23 21:42:24,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-09-23 21:42:24,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-09-23 21:42:24,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=2863, Unknown=0, NotChecked=0, Total=2970 [2018-09-23 21:42:24,754 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 55 states. [2018-09-23 21:42:26,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:42:26,934 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-09-23 21:42:26,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-09-23 21:42:26,935 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 55 [2018-09-23 21:42:26,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:42:26,936 INFO L225 Difference]: With dead ends: 59 [2018-09-23 21:42:26,936 INFO L226 Difference]: Without dead ends: 57 [2018-09-23 21:42:26,936 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=111, Invalid=2969, Unknown=0, NotChecked=0, Total=3080 [2018-09-23 21:42:26,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-09-23 21:42:26,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-09-23 21:42:26,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-09-23 21:42:26,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-09-23 21:42:26,942 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2018-09-23 21:42:26,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:42:26,942 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-09-23 21:42:26,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-09-23 21:42:26,942 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-09-23 21:42:26,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-09-23 21:42:26,943 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:42:26,943 INFO L375 BasicCegarLoop]: trace histogram [52, 1, 1, 1, 1] [2018-09-23 21:42:26,943 INFO L423 AbstractCegarLoop]: === Iteration 53 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:42:26,943 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:42:26,943 INFO L82 PathProgramCache]: Analyzing trace with hash 723588964, now seen corresponding path program 52 times [2018-09-23 21:42:26,943 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:42:26,943 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:42:26,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:26,944 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:42:26,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:26,950 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:42:26,950 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:42:26,950 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:42:26,959 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:42:30,170 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:42:30,170 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:42:30,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:42:31,857 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:42:31,877 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:42:31,877 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2018-09-23 21:42:31,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-09-23 21:42:31,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-09-23 21:42:31,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=2971, Unknown=0, NotChecked=0, Total=3080 [2018-09-23 21:42:31,878 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 56 states. [2018-09-23 21:42:34,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:42:34,077 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-09-23 21:42:34,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-09-23 21:42:34,078 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 56 [2018-09-23 21:42:34,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:42:34,079 INFO L225 Difference]: With dead ends: 60 [2018-09-23 21:42:34,079 INFO L226 Difference]: Without dead ends: 58 [2018-09-23 21:42:34,079 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=113, Invalid=3079, Unknown=0, NotChecked=0, Total=3192 [2018-09-23 21:42:34,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-09-23 21:42:34,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-09-23 21:42:34,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-09-23 21:42:34,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2018-09-23 21:42:34,084 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2018-09-23 21:42:34,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:42:34,084 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2018-09-23 21:42:34,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-09-23 21:42:34,084 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2018-09-23 21:42:34,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-09-23 21:42:34,084 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:42:34,084 INFO L375 BasicCegarLoop]: trace histogram [53, 1, 1, 1, 1] [2018-09-23 21:42:34,085 INFO L423 AbstractCegarLoop]: === Iteration 54 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:42:34,085 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:42:34,085 INFO L82 PathProgramCache]: Analyzing trace with hash 956419429, now seen corresponding path program 53 times [2018-09-23 21:42:34,085 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:42:34,085 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:42:34,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:34,086 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:42:34,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:34,091 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:42:34,092 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:42:34,092 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:42:34,107 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:42:38,079 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2018-09-23 21:42:38,079 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:42:38,093 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:42:39,807 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:42:39,828 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:42:39,829 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2018-09-23 21:42:39,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-09-23 21:42:39,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-09-23 21:42:39,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=3081, Unknown=0, NotChecked=0, Total=3192 [2018-09-23 21:42:39,830 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 57 states. [2018-09-23 21:42:42,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:42:42,133 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-09-23 21:42:42,134 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-09-23 21:42:42,134 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 57 [2018-09-23 21:42:42,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:42:42,134 INFO L225 Difference]: With dead ends: 61 [2018-09-23 21:42:42,135 INFO L226 Difference]: Without dead ends: 59 [2018-09-23 21:42:42,135 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=115, Invalid=3191, Unknown=0, NotChecked=0, Total=3306 [2018-09-23 21:42:42,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-09-23 21:42:42,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-09-23 21:42:42,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-09-23 21:42:42,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-09-23 21:42:42,139 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2018-09-23 21:42:42,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:42:42,139 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-09-23 21:42:42,139 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-09-23 21:42:42,139 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-09-23 21:42:42,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-09-23 21:42:42,140 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:42:42,140 INFO L375 BasicCegarLoop]: trace histogram [54, 1, 1, 1, 1] [2018-09-23 21:42:42,140 INFO L423 AbstractCegarLoop]: === Iteration 55 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:42:42,140 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:42:42,140 INFO L82 PathProgramCache]: Analyzing trace with hash -415770748, now seen corresponding path program 54 times [2018-09-23 21:42:42,140 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:42:42,140 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:42:42,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:42,141 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:42:42,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:42,146 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:42:42,146 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:42:42,146 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:42:42,162 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:42:46,475 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 28 check-sat command(s) [2018-09-23 21:42:46,476 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:42:46,483 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:42:48,235 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:42:48,255 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:42:48,255 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2018-09-23 21:42:48,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-09-23 21:42:48,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-09-23 21:42:48,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=3193, Unknown=0, NotChecked=0, Total=3306 [2018-09-23 21:42:48,256 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 58 states. [2018-09-23 21:42:50,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:42:50,633 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2018-09-23 21:42:50,633 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-09-23 21:42:50,634 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 58 [2018-09-23 21:42:50,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:42:50,634 INFO L225 Difference]: With dead ends: 62 [2018-09-23 21:42:50,634 INFO L226 Difference]: Without dead ends: 60 [2018-09-23 21:42:50,635 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=117, Invalid=3305, Unknown=0, NotChecked=0, Total=3422 [2018-09-23 21:42:50,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-09-23 21:42:50,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-09-23 21:42:50,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-09-23 21:42:50,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-09-23 21:42:50,640 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 58 [2018-09-23 21:42:50,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:42:50,640 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-09-23 21:42:50,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-09-23 21:42:50,640 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-09-23 21:42:50,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-09-23 21:42:50,640 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:42:50,640 INFO L375 BasicCegarLoop]: trace histogram [55, 1, 1, 1, 1] [2018-09-23 21:42:50,641 INFO L423 AbstractCegarLoop]: === Iteration 56 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:42:50,641 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:42:50,641 INFO L82 PathProgramCache]: Analyzing trace with hash -3993275, now seen corresponding path program 55 times [2018-09-23 21:42:50,641 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:42:50,641 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:42:50,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:50,642 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:42:50,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:50,649 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:42:50,649 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:42:50,649 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:42:50,665 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:42:54,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:42:54,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:42:56,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:42:56,317 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:42:56,317 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2018-09-23 21:42:56,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-09-23 21:42:56,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-09-23 21:42:56,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=3307, Unknown=0, NotChecked=0, Total=3422 [2018-09-23 21:42:56,318 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 59 states. [2018-09-23 21:42:58,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:42:58,760 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-09-23 21:42:58,761 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-09-23 21:42:58,761 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 59 [2018-09-23 21:42:58,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:42:58,762 INFO L225 Difference]: With dead ends: 63 [2018-09-23 21:42:58,762 INFO L226 Difference]: Without dead ends: 61 [2018-09-23 21:42:58,763 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=119, Invalid=3421, Unknown=0, NotChecked=0, Total=3540 [2018-09-23 21:42:58,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-09-23 21:42:58,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-09-23 21:42:58,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-09-23 21:42:58,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-09-23 21:42:58,767 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 59 [2018-09-23 21:42:58,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:42:58,768 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-09-23 21:42:58,768 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-09-23 21:42:58,768 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-09-23 21:42:58,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-09-23 21:42:58,768 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:42:58,768 INFO L375 BasicCegarLoop]: trace histogram [56, 1, 1, 1, 1] [2018-09-23 21:42:58,768 INFO L423 AbstractCegarLoop]: === Iteration 57 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:42:58,768 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:42:58,769 INFO L82 PathProgramCache]: Analyzing trace with hash -123793500, now seen corresponding path program 56 times [2018-09-23 21:42:58,769 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:42:58,769 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:42:58,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:58,769 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:42:58,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:42:58,775 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:42:58,775 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:42:58,776 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:42:58,789 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:43:02,631 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:43:02,631 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:43:02,645 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:43:04,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:43:04,653 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:43:04,654 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2018-09-23 21:43:04,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-09-23 21:43:04,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-09-23 21:43:04,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=3423, Unknown=0, NotChecked=0, Total=3540 [2018-09-23 21:43:04,654 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 60 states. [2018-09-23 21:43:07,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:43:07,178 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2018-09-23 21:43:07,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-09-23 21:43:07,179 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 60 [2018-09-23 21:43:07,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:43:07,180 INFO L225 Difference]: With dead ends: 64 [2018-09-23 21:43:07,180 INFO L226 Difference]: Without dead ends: 62 [2018-09-23 21:43:07,180 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=121, Invalid=3539, Unknown=0, NotChecked=0, Total=3660 [2018-09-23 21:43:07,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-09-23 21:43:07,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2018-09-23 21:43:07,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-09-23 21:43:07,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-09-23 21:43:07,185 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 60 [2018-09-23 21:43:07,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:43:07,185 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-09-23 21:43:07,185 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-09-23 21:43:07,185 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-09-23 21:43:07,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-09-23 21:43:07,186 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:43:07,186 INFO L375 BasicCegarLoop]: trace histogram [57, 1, 1, 1, 1] [2018-09-23 21:43:07,186 INFO L423 AbstractCegarLoop]: === Iteration 58 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:43:07,186 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:43:07,186 INFO L82 PathProgramCache]: Analyzing trace with hash 457366821, now seen corresponding path program 57 times [2018-09-23 21:43:07,186 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:43:07,186 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:43:07,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:43:07,187 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:43:07,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:43:07,193 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:43:07,193 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:43:07,193 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:43:07,211 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:43:12,297 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-09-23 21:43:12,297 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:43:12,305 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:43:14,514 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:43:14,535 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:43:14,535 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2018-09-23 21:43:14,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-09-23 21:43:14,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-09-23 21:43:14,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=3541, Unknown=0, NotChecked=0, Total=3660 [2018-09-23 21:43:14,536 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 61 states. [2018-09-23 21:43:17,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:43:17,154 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2018-09-23 21:43:17,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-09-23 21:43:17,154 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 61 [2018-09-23 21:43:17,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:43:17,155 INFO L225 Difference]: With dead ends: 65 [2018-09-23 21:43:17,155 INFO L226 Difference]: Without dead ends: 63 [2018-09-23 21:43:17,155 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=123, Invalid=3659, Unknown=0, NotChecked=0, Total=3782 [2018-09-23 21:43:17,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-09-23 21:43:17,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-09-23 21:43:17,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-09-23 21:43:17,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-09-23 21:43:17,160 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 61 [2018-09-23 21:43:17,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:43:17,160 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-09-23 21:43:17,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-09-23 21:43:17,160 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-09-23 21:43:17,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-09-23 21:43:17,161 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:43:17,161 INFO L375 BasicCegarLoop]: trace histogram [58, 1, 1, 1, 1] [2018-09-23 21:43:17,161 INFO L423 AbstractCegarLoop]: === Iteration 59 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:43:17,161 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:43:17,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1293467588, now seen corresponding path program 58 times [2018-09-23 21:43:17,162 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:43:17,162 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:43:17,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:43:17,162 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:43:17,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:43:17,168 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:43:17,169 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:43:17,169 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:43:17,180 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:43:21,849 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:43:21,849 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:43:21,866 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:43:23,898 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:43:23,918 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:43:23,919 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2018-09-23 21:43:23,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-09-23 21:43:23,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-09-23 21:43:23,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=3661, Unknown=0, NotChecked=0, Total=3782 [2018-09-23 21:43:23,920 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 62 states. [2018-09-23 21:43:26,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:43:26,629 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-09-23 21:43:26,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-09-23 21:43:26,630 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 62 [2018-09-23 21:43:26,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:43:26,631 INFO L225 Difference]: With dead ends: 66 [2018-09-23 21:43:26,631 INFO L226 Difference]: Without dead ends: 64 [2018-09-23 21:43:26,631 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=125, Invalid=3781, Unknown=0, NotChecked=0, Total=3906 [2018-09-23 21:43:26,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-09-23 21:43:26,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-09-23 21:43:26,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-09-23 21:43:26,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2018-09-23 21:43:26,635 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 62 [2018-09-23 21:43:26,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:43:26,635 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2018-09-23 21:43:26,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-09-23 21:43:26,635 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2018-09-23 21:43:26,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-09-23 21:43:26,636 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:43:26,636 INFO L375 BasicCegarLoop]: trace histogram [59, 1, 1, 1, 1] [2018-09-23 21:43:26,636 INFO L423 AbstractCegarLoop]: === Iteration 60 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:43:26,636 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:43:26,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1442787589, now seen corresponding path program 59 times [2018-09-23 21:43:26,636 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:43:26,636 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:43:26,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:43:26,637 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:43:26,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:43:26,643 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:43:26,643 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:43:26,643 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:43:26,661 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:43:32,626 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2018-09-23 21:43:32,626 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:43:32,643 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:43:34,710 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:43:34,731 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:43:34,731 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2018-09-23 21:43:34,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-09-23 21:43:34,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-09-23 21:43:34,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=3783, Unknown=0, NotChecked=0, Total=3906 [2018-09-23 21:43:34,732 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 63 states. [2018-09-23 21:43:37,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:43:37,514 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2018-09-23 21:43:37,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-09-23 21:43:37,514 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 63 [2018-09-23 21:43:37,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:43:37,515 INFO L225 Difference]: With dead ends: 67 [2018-09-23 21:43:37,515 INFO L226 Difference]: Without dead ends: 65 [2018-09-23 21:43:37,516 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=127, Invalid=3905, Unknown=0, NotChecked=0, Total=4032 [2018-09-23 21:43:37,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-09-23 21:43:37,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-09-23 21:43:37,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-09-23 21:43:37,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-09-23 21:43:37,520 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 63 [2018-09-23 21:43:37,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:43:37,520 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-09-23 21:43:37,521 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-09-23 21:43:37,521 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-09-23 21:43:37,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-09-23 21:43:37,521 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:43:37,521 INFO L375 BasicCegarLoop]: trace histogram [60, 1, 1, 1, 1] [2018-09-23 21:43:37,521 INFO L423 AbstractCegarLoop]: === Iteration 61 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:43:37,522 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:43:37,522 INFO L82 PathProgramCache]: Analyzing trace with hash 1776740324, now seen corresponding path program 60 times [2018-09-23 21:43:37,522 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:43:37,522 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:43:37,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:43:37,523 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:43:37,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:43:37,529 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:43:37,529 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:43:37,529 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:43:37,541 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:43:43,699 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2018-09-23 21:43:43,700 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:43:43,709 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:43:45,824 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:43:45,844 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:43:45,844 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2018-09-23 21:43:45,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-09-23 21:43:45,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-09-23 21:43:45,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=3907, Unknown=0, NotChecked=0, Total=4032 [2018-09-23 21:43:45,845 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 64 states. [2018-09-23 21:43:48,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:43:48,719 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2018-09-23 21:43:48,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-09-23 21:43:48,720 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 64 [2018-09-23 21:43:48,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:43:48,720 INFO L225 Difference]: With dead ends: 68 [2018-09-23 21:43:48,721 INFO L226 Difference]: Without dead ends: 66 [2018-09-23 21:43:48,721 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=129, Invalid=4031, Unknown=0, NotChecked=0, Total=4160 [2018-09-23 21:43:48,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-09-23 21:43:48,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-09-23 21:43:48,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-09-23 21:43:48,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-09-23 21:43:48,726 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 64 [2018-09-23 21:43:48,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:43:48,726 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-09-23 21:43:48,726 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-09-23 21:43:48,726 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-09-23 21:43:48,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-09-23 21:43:48,727 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:43:48,727 INFO L375 BasicCegarLoop]: trace histogram [61, 1, 1, 1, 1] [2018-09-23 21:43:48,727 INFO L423 AbstractCegarLoop]: === Iteration 62 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:43:48,727 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:43:48,727 INFO L82 PathProgramCache]: Analyzing trace with hash -755626779, now seen corresponding path program 61 times [2018-09-23 21:43:48,727 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:43:48,727 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:43:48,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:43:48,728 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:43:48,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:43:48,736 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:43:48,736 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:43:48,736 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:43:48,756 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:43:54,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:43:54,624 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:43:56,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:43:56,818 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:43:56,819 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64] total 64 [2018-09-23 21:43:56,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-09-23 21:43:56,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-09-23 21:43:56,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=4033, Unknown=0, NotChecked=0, Total=4160 [2018-09-23 21:43:56,820 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 65 states. [2018-09-23 21:43:59,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:43:59,793 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-09-23 21:43:59,793 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-09-23 21:43:59,793 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 65 [2018-09-23 21:43:59,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:43:59,794 INFO L225 Difference]: With dead ends: 69 [2018-09-23 21:43:59,795 INFO L226 Difference]: Without dead ends: 67 [2018-09-23 21:43:59,795 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=131, Invalid=4159, Unknown=0, NotChecked=0, Total=4290 [2018-09-23 21:43:59,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-09-23 21:43:59,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-09-23 21:43:59,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-09-23 21:43:59,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2018-09-23 21:43:59,801 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 65 [2018-09-23 21:43:59,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:43:59,801 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2018-09-23 21:43:59,801 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-09-23 21:43:59,801 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2018-09-23 21:43:59,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-09-23 21:43:59,801 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:43:59,801 INFO L375 BasicCegarLoop]: trace histogram [62, 1, 1, 1, 1] [2018-09-23 21:43:59,802 INFO L423 AbstractCegarLoop]: === Iteration 63 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:43:59,802 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:43:59,802 INFO L82 PathProgramCache]: Analyzing trace with hash -1949595644, now seen corresponding path program 62 times [2018-09-23 21:43:59,802 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:43:59,802 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:43:59,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:43:59,803 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:43:59,803 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:43:59,809 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:43:59,809 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:43:59,809 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:43:59,826 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:44:05,817 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:44:05,818 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:44:05,835 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:44:08,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:44:08,115 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:44:08,115 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2018-09-23 21:44:08,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-09-23 21:44:08,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-09-23 21:44:08,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=4161, Unknown=0, NotChecked=0, Total=4290 [2018-09-23 21:44:08,116 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 66 states. [2018-09-23 21:44:11,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:44:11,164 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2018-09-23 21:44:11,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-09-23 21:44:11,164 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 66 [2018-09-23 21:44:11,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:44:11,165 INFO L225 Difference]: With dead ends: 70 [2018-09-23 21:44:11,165 INFO L226 Difference]: Without dead ends: 68 [2018-09-23 21:44:11,166 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=133, Invalid=4289, Unknown=0, NotChecked=0, Total=4422 [2018-09-23 21:44:11,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-09-23 21:44:11,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2018-09-23 21:44:11,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-09-23 21:44:11,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-09-23 21:44:11,170 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 66 [2018-09-23 21:44:11,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:44:11,171 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-09-23 21:44:11,171 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-09-23 21:44:11,171 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-09-23 21:44:11,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-09-23 21:44:11,171 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:44:11,171 INFO L375 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1] [2018-09-23 21:44:11,172 INFO L423 AbstractCegarLoop]: === Iteration 64 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:44:11,172 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:44:11,172 INFO L82 PathProgramCache]: Analyzing trace with hash -307924795, now seen corresponding path program 63 times [2018-09-23 21:44:11,172 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:44:11,172 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:44:11,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:44:11,173 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:44:11,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:44:11,179 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:44:11,180 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:44:11,180 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:44:11,194 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:44:19,078 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-09-23 21:44:19,078 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:44:19,087 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:44:21,565 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:44:21,584 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:44:21,585 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66] total 66 [2018-09-23 21:44:21,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-09-23 21:44:21,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-09-23 21:44:21,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=4291, Unknown=0, NotChecked=0, Total=4422 [2018-09-23 21:44:21,586 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 67 states. [2018-09-23 21:44:24,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:44:24,724 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2018-09-23 21:44:24,724 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-09-23 21:44:24,725 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 67 [2018-09-23 21:44:24,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:44:24,726 INFO L225 Difference]: With dead ends: 71 [2018-09-23 21:44:24,726 INFO L226 Difference]: Without dead ends: 69 [2018-09-23 21:44:24,727 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=135, Invalid=4421, Unknown=0, NotChecked=0, Total=4556 [2018-09-23 21:44:24,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-09-23 21:44:24,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-09-23 21:44:24,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-09-23 21:44:24,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-09-23 21:44:24,732 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 67 [2018-09-23 21:44:24,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:44:24,732 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-09-23 21:44:24,733 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-09-23 21:44:24,733 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-09-23 21:44:24,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-09-23 21:44:24,733 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:44:24,733 INFO L375 BasicCegarLoop]: trace histogram [64, 1, 1, 1, 1] [2018-09-23 21:44:24,733 INFO L423 AbstractCegarLoop]: === Iteration 65 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:44:24,734 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:44:24,734 INFO L82 PathProgramCache]: Analyzing trace with hash -955736028, now seen corresponding path program 64 times [2018-09-23 21:44:24,734 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:44:24,734 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:44:24,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:44:24,735 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:44:24,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:44:24,742 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:44:24,742 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:44:24,742 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:44:24,757 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:44:31,708 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:44:31,708 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:44:31,729 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:44:34,942 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 0 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:44:34,963 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-23 21:44:34,963 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67] total 67 [2018-09-23 21:44:34,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-09-23 21:44:34,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-09-23 21:44:34,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=4423, Unknown=0, NotChecked=0, Total=4556 [2018-09-23 21:44:34,964 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 68 states. [2018-09-23 21:44:38,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:44:38,207 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-09-23 21:44:38,207 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-09-23 21:44:38,207 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 68 [2018-09-23 21:44:38,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:44:38,208 INFO L225 Difference]: With dead ends: 72 [2018-09-23 21:44:38,208 INFO L226 Difference]: Without dead ends: 70 [2018-09-23 21:44:38,209 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=137, Invalid=4555, Unknown=0, NotChecked=0, Total=4692 [2018-09-23 21:44:38,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-09-23 21:44:38,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-09-23 21:44:38,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-09-23 21:44:38,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-09-23 21:44:38,213 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 68 [2018-09-23 21:44:38,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:44:38,214 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-09-23 21:44:38,214 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-09-23 21:44:38,214 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-09-23 21:44:38,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-09-23 21:44:38,214 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:44:38,214 INFO L375 BasicCegarLoop]: trace histogram [65, 1, 1, 1, 1] [2018-09-23 21:44:38,215 INFO L423 AbstractCegarLoop]: === Iteration 66 === [multErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2018-09-23 21:44:38,215 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:44:38,215 INFO L82 PathProgramCache]: Analyzing trace with hash 436952229, now seen corresponding path program 65 times [2018-09-23 21:44:38,215 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:44:38,215 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:44:38,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:44:38,216 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:44:38,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:44:38,222 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-23 21:44:38,222 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-23 21:44:38,223 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-23 21:44:38,238 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown