java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-new/nested-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 23:15:52,132 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 23:15:52,135 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 23:15:52,149 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 23:15:52,150 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 23:15:52,152 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 23:15:52,154 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 23:15:52,162 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 23:15:52,164 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 23:15:52,167 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 23:15:52,168 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 23:15:52,169 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 23:15:52,169 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 23:15:52,170 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 23:15:52,171 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 23:15:52,172 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 23:15:52,173 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 23:15:52,174 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 23:15:52,175 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 23:15:52,177 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 23:15:52,178 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 23:15:52,179 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 23:15:52,180 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 23:15:52,181 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 23:15:52,183 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 23:15:52,186 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 23:15:52,187 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 23:15:52,187 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 23:15:52,188 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 23:15:52,189 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 23:15:52,189 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 23:15:52,190 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 23:15:52,190 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 23:15:52,190 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 23:15:52,191 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 23:15:52,192 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 23:15:52,193 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-14 23:15:52,206 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 23:15:52,206 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 23:15:52,207 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 23:15:52,208 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 23:15:52,208 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 23:15:52,208 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 23:15:52,208 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 23:15:52,208 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 23:15:52,209 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 23:15:52,209 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 23:15:52,209 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 23:15:52,209 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 23:15:52,209 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 23:15:52,210 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 23:15:52,210 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 23:15:52,210 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 23:15:52,210 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 23:15:52,210 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 23:15:52,211 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 23:15:52,211 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 23:15:52,211 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 23:15:52,211 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 23:15:52,212 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 23:15:52,212 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 23:15:52,212 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 23:15:52,212 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 23:15:52,212 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 23:15:52,212 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 23:15:52,213 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 23:15:52,484 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 23:15:52,500 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 23:15:52,504 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 23:15:52,506 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 23:15:52,506 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 23:15:52,507 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/nested-1.i [2019-10-14 23:15:52,582 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/12845f845/8f0ac1d17aeb4567b5a1b4aba06d3bcf/FLAG83609d5ad [2019-10-14 23:15:53,008 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 23:15:53,009 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/nested-1.i [2019-10-14 23:15:53,015 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/12845f845/8f0ac1d17aeb4567b5a1b4aba06d3bcf/FLAG83609d5ad [2019-10-14 23:15:53,421 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/12845f845/8f0ac1d17aeb4567b5a1b4aba06d3bcf [2019-10-14 23:15:53,431 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 23:15:53,433 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 23:15:53,434 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 23:15:53,434 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 23:15:53,437 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 23:15:53,437 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:15:53" (1/1) ... [2019-10-14 23:15:53,440 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5aca1f37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:53, skipping insertion in model container [2019-10-14 23:15:53,440 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:15:53" (1/1) ... [2019-10-14 23:15:53,447 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 23:15:53,465 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 23:15:53,627 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:15:53,631 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 23:15:53,645 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:15:53,657 INFO L192 MainTranslator]: Completed translation [2019-10-14 23:15:53,657 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:53 WrapperNode [2019-10-14 23:15:53,657 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 23:15:53,658 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 23:15:53,658 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 23:15:53,658 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 23:15:53,667 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:53" (1/1) ... [2019-10-14 23:15:53,668 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:53" (1/1) ... [2019-10-14 23:15:53,748 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:53" (1/1) ... [2019-10-14 23:15:53,749 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:53" (1/1) ... [2019-10-14 23:15:53,754 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:53" (1/1) ... [2019-10-14 23:15:53,761 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:53" (1/1) ... [2019-10-14 23:15:53,762 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:53" (1/1) ... [2019-10-14 23:15:53,763 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 23:15:53,764 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 23:15:53,764 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 23:15:53,764 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 23:15:53,765 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:53" (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 [2019-10-14 23:15:53,824 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 23:15:53,824 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 23:15:53,824 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 23:15:53,824 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 23:15:53,825 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 23:15:53,825 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-14 23:15:53,825 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 23:15:53,825 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 23:15:53,825 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 23:15:53,825 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 23:15:53,825 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 23:15:54,015 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 23:15:54,016 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-14 23:15:54,017 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:15:54 BoogieIcfgContainer [2019-10-14 23:15:54,018 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 23:15:54,019 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 23:15:54,019 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 23:15:54,022 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 23:15:54,023 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 11:15:53" (1/3) ... [2019-10-14 23:15:54,023 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7508831b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:15:54, skipping insertion in model container [2019-10-14 23:15:54,024 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:15:53" (2/3) ... [2019-10-14 23:15:54,024 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7508831b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:15:54, skipping insertion in model container [2019-10-14 23:15:54,024 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:15:54" (3/3) ... [2019-10-14 23:15:54,026 INFO L109 eAbstractionObserver]: Analyzing ICFG nested-1.i [2019-10-14 23:15:54,037 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 23:15:54,046 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 23:15:54,061 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 23:15:54,092 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 23:15:54,093 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 23:15:54,093 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 23:15:54,093 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 23:15:54,093 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 23:15:54,093 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 23:15:54,094 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 23:15:54,094 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 23:15:54,118 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-10-14 23:15:54,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-14 23:15:54,125 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:54,126 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:54,128 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:54,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:54,136 INFO L82 PathProgramCache]: Analyzing trace with hash -1266359381, now seen corresponding path program 1 times [2019-10-14 23:15:54,147 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:54,147 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [701123249] [2019-10-14 23:15:54,148 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:54,148 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:54,148 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:54,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:54,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:54,321 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:54,322 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [701123249] [2019-10-14 23:15:54,323 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:15:54,323 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 23:15:54,323 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099155316] [2019-10-14 23:15:54,327 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 23:15:54,327 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:54,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 23:15:54,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:15:54,344 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 4 states. [2019-10-14 23:15:54,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:54,449 INFO L93 Difference]: Finished difference Result 45 states and 60 transitions. [2019-10-14 23:15:54,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 23:15:54,452 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-10-14 23:15:54,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:54,466 INFO L225 Difference]: With dead ends: 45 [2019-10-14 23:15:54,466 INFO L226 Difference]: Without dead ends: 20 [2019-10-14 23:15:54,472 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-10-14 23:15:54,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-14 23:15:54,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2019-10-14 23:15:54,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-10-14 23:15:54,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-10-14 23:15:54,529 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2019-10-14 23:15:54,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:54,531 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-10-14 23:15:54,532 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 23:15:54,533 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-10-14 23:15:54,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-14 23:15:54,535 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:54,536 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:54,536 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:54,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:54,538 INFO L82 PathProgramCache]: Analyzing trace with hash -1008321469, now seen corresponding path program 1 times [2019-10-14 23:15:54,538 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:54,539 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785324373] [2019-10-14 23:15:54,539 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:54,539 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:54,540 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:54,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:54,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:54,623 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:54,623 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785324373] [2019-10-14 23:15:54,624 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:15:54,625 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 23:15:54,626 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854730689] [2019-10-14 23:15:54,627 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 23:15:54,628 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:54,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 23:15:54,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:15:54,629 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2019-10-14 23:15:54,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:54,673 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2019-10-14 23:15:54,673 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 23:15:54,673 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-10-14 23:15:54,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:54,675 INFO L225 Difference]: With dead ends: 28 [2019-10-14 23:15:54,675 INFO L226 Difference]: Without dead ends: 19 [2019-10-14 23:15:54,676 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-10-14 23:15:54,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-10-14 23:15:54,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2019-10-14 23:15:54,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-14 23:15:54,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-10-14 23:15:54,683 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 15 [2019-10-14 23:15:54,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:54,683 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-10-14 23:15:54,683 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 23:15:54,683 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-10-14 23:15:54,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 23:15:54,684 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:54,684 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:54,685 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:54,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:54,685 INFO L82 PathProgramCache]: Analyzing trace with hash 1823795457, now seen corresponding path program 1 times [2019-10-14 23:15:54,686 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:54,686 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325306960] [2019-10-14 23:15:54,686 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:54,686 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:54,687 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:54,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:54,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:54,809 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:54,810 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325306960] [2019-10-14 23:15:54,810 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [245157258] [2019-10-14 23:15:54,810 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-10-14 23:15:54,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:54,852 INFO L256 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 23:15:54,859 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:54,953 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:54,954 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:54,954 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2019-10-14 23:15:54,954 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641537181] [2019-10-14 23:15:54,955 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 23:15:54,956 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:54,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 23:15:54,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:15:54,958 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 11 states. [2019-10-14 23:15:55,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:55,215 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2019-10-14 23:15:55,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 23:15:55,216 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 17 [2019-10-14 23:15:55,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:55,217 INFO L225 Difference]: With dead ends: 38 [2019-10-14 23:15:55,217 INFO L226 Difference]: Without dead ends: 28 [2019-10-14 23:15:55,218 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=72, Invalid=200, Unknown=0, NotChecked=0, Total=272 [2019-10-14 23:15:55,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-14 23:15:55,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 20. [2019-10-14 23:15:55,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-14 23:15:55,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2019-10-14 23:15:55,225 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2019-10-14 23:15:55,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:55,225 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2019-10-14 23:15:55,225 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 23:15:55,225 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2019-10-14 23:15:55,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-14 23:15:55,226 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:55,226 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:55,435 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:55,437 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:55,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:55,437 INFO L82 PathProgramCache]: Analyzing trace with hash 478895679, now seen corresponding path program 2 times [2019-10-14 23:15:55,438 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:55,439 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232389237] [2019-10-14 23:15:55,439 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:55,439 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:55,439 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:55,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:55,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:55,576 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:55,577 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232389237] [2019-10-14 23:15:55,577 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840104150] [2019-10-14 23:15:55,577 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-10-14 23:15:55,623 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:15:55,623 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:55,624 INFO L256 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 23:15:55,628 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:55,732 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:55,732 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:55,732 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 13 [2019-10-14 23:15:55,733 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167687915] [2019-10-14 23:15:55,733 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 23:15:55,734 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:55,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 23:15:55,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:15:55,734 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 13 states. [2019-10-14 23:15:56,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:56,017 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2019-10-14 23:15:56,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 23:15:56,018 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 19 [2019-10-14 23:15:56,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:56,019 INFO L225 Difference]: With dead ends: 44 [2019-10-14 23:15:56,019 INFO L226 Difference]: Without dead ends: 32 [2019-10-14 23:15:56,020 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=311, Unknown=0, NotChecked=0, Total=420 [2019-10-14 23:15:56,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-10-14 23:15:56,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 22. [2019-10-14 23:15:56,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-14 23:15:56,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2019-10-14 23:15:56,031 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 19 [2019-10-14 23:15:56,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:56,032 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2019-10-14 23:15:56,033 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 23:15:56,033 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2019-10-14 23:15:56,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-14 23:15:56,034 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:56,035 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:56,239 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:56,240 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:56,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:56,240 INFO L82 PathProgramCache]: Analyzing trace with hash 815365117, now seen corresponding path program 3 times [2019-10-14 23:15:56,241 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:56,241 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111633761] [2019-10-14 23:15:56,242 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:56,242 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:56,242 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:56,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:56,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:56,350 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:56,351 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111633761] [2019-10-14 23:15:56,351 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [483860811] [2019-10-14 23:15:56,351 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-10-14 23:15:56,378 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-14 23:15:56,378 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:56,379 INFO L256 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 23:15:56,381 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:56,412 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 23:15:56,413 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:56,413 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5] total 12 [2019-10-14 23:15:56,413 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153816778] [2019-10-14 23:15:56,414 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 23:15:56,414 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:56,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 23:15:56,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2019-10-14 23:15:56,415 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 12 states. [2019-10-14 23:15:56,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:56,661 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2019-10-14 23:15:56,661 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 23:15:56,661 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2019-10-14 23:15:56,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:56,663 INFO L225 Difference]: With dead ends: 57 [2019-10-14 23:15:56,663 INFO L226 Difference]: Without dead ends: 52 [2019-10-14 23:15:56,664 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=106, Invalid=274, Unknown=0, NotChecked=0, Total=380 [2019-10-14 23:15:56,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-10-14 23:15:56,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 31. [2019-10-14 23:15:56,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-14 23:15:56,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2019-10-14 23:15:56,672 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 21 [2019-10-14 23:15:56,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:56,672 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2019-10-14 23:15:56,672 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 23:15:56,673 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2019-10-14 23:15:56,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-14 23:15:56,674 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:56,674 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:56,877 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:56,877 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:56,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:56,878 INFO L82 PathProgramCache]: Analyzing trace with hash -441049109, now seen corresponding path program 4 times [2019-10-14 23:15:56,879 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:56,879 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591951248] [2019-10-14 23:15:56,880 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:56,880 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:56,881 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:56,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:57,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:57,093 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:57,094 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591951248] [2019-10-14 23:15:57,094 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [185311184] [2019-10-14 23:15:57,094 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 [2019-10-14 23:15:57,128 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:15:57,128 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:57,129 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 23:15:57,131 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:57,236 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 9 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2019-10-14 23:15:57,236 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:57,237 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 7] total 21 [2019-10-14 23:15:57,237 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118439783] [2019-10-14 23:15:57,237 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 23:15:57,238 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:57,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 23:15:57,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=357, Unknown=0, NotChecked=0, Total=420 [2019-10-14 23:15:57,238 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 21 states. [2019-10-14 23:15:57,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:57,603 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2019-10-14 23:15:57,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 23:15:57,603 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 30 [2019-10-14 23:15:57,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:57,604 INFO L225 Difference]: With dead ends: 53 [2019-10-14 23:15:57,604 INFO L226 Difference]: Without dead ends: 37 [2019-10-14 23:15:57,606 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=173, Invalid=757, Unknown=0, NotChecked=0, Total=930 [2019-10-14 23:15:57,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-14 23:15:57,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2019-10-14 23:15:57,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-10-14 23:15:57,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2019-10-14 23:15:57,613 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 30 [2019-10-14 23:15:57,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:57,613 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2019-10-14 23:15:57,613 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 23:15:57,614 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2019-10-14 23:15:57,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-14 23:15:57,614 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:57,615 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:57,820 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:57,821 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:57,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:57,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1891685973, now seen corresponding path program 5 times [2019-10-14 23:15:57,821 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:57,822 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238001301] [2019-10-14 23:15:57,822 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:57,822 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:57,822 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:57,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:58,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:58,050 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:58,052 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238001301] [2019-10-14 23:15:58,052 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067167348] [2019-10-14 23:15:58,052 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2019-10-14 23:15:58,097 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2019-10-14 23:15:58,098 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:58,098 INFO L256 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 23:15:58,100 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:58,227 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 43 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-14 23:15:58,228 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:58,228 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 8] total 24 [2019-10-14 23:15:58,228 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641150799] [2019-10-14 23:15:58,229 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-14 23:15:58,229 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:58,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-14 23:15:58,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2019-10-14 23:15:58,230 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 24 states. [2019-10-14 23:15:58,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:58,716 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2019-10-14 23:15:58,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 23:15:58,717 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 34 [2019-10-14 23:15:58,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:58,718 INFO L225 Difference]: With dead ends: 59 [2019-10-14 23:15:58,718 INFO L226 Difference]: Without dead ends: 41 [2019-10-14 23:15:58,719 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=232, Invalid=1028, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 23:15:58,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-10-14 23:15:58,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2019-10-14 23:15:58,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-10-14 23:15:58,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2019-10-14 23:15:58,727 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 34 [2019-10-14 23:15:58,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:58,727 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2019-10-14 23:15:58,727 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-14 23:15:58,728 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2019-10-14 23:15:58,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-14 23:15:58,729 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:58,729 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:58,933 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:58,933 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:58,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:58,934 INFO L82 PathProgramCache]: Analyzing trace with hash -98733461, now seen corresponding path program 6 times [2019-10-14 23:15:58,934 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:58,934 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034581441] [2019-10-14 23:15:58,935 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:58,935 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:58,935 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:58,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:59,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:59,184 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 115 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:59,184 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034581441] [2019-10-14 23:15:59,185 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [670863400] [2019-10-14 23:15:59,185 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2019-10-14 23:15:59,214 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2019-10-14 23:15:59,214 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:59,215 INFO L256 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 23:15:59,217 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:59,281 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-10-14 23:15:59,282 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:59,283 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 6] total 23 [2019-10-14 23:15:59,283 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537051577] [2019-10-14 23:15:59,284 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 23:15:59,284 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:59,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 23:15:59,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2019-10-14 23:15:59,285 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 23 states. [2019-10-14 23:16:00,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:00,131 INFO L93 Difference]: Finished difference Result 103 states and 112 transitions. [2019-10-14 23:16:00,131 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-14 23:16:00,132 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 38 [2019-10-14 23:16:00,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:00,133 INFO L225 Difference]: With dead ends: 103 [2019-10-14 23:16:00,133 INFO L226 Difference]: Without dead ends: 98 [2019-10-14 23:16:00,135 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=417, Invalid=1839, Unknown=0, NotChecked=0, Total=2256 [2019-10-14 23:16:00,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2019-10-14 23:16:00,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 52. [2019-10-14 23:16:00,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 23:16:00,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2019-10-14 23:16:00,146 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 38 [2019-10-14 23:16:00,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:00,147 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2019-10-14 23:16:00,147 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 23:16:00,147 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2019-10-14 23:16:00,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-14 23:16:00,148 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:00,149 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:00,360 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:00,360 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:00,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:00,361 INFO L82 PathProgramCache]: Analyzing trace with hash 2002360889, now seen corresponding path program 7 times [2019-10-14 23:16:00,362 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:00,362 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462451192] [2019-10-14 23:16:00,362 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:00,363 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:00,363 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:00,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:00,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:00,772 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:16:00,772 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462451192] [2019-10-14 23:16:00,772 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414557261] [2019-10-14 23:16:00,772 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2019-10-14 23:16:00,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:00,814 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 23:16:00,816 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:01,010 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 125 proven. 25 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2019-10-14 23:16:01,010 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:01,011 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 9] total 35 [2019-10-14 23:16:01,011 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83231940] [2019-10-14 23:16:01,011 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-14 23:16:01,012 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:01,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-14 23:16:01,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1054, Unknown=0, NotChecked=0, Total=1190 [2019-10-14 23:16:01,013 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 35 states. [2019-10-14 23:16:01,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:01,654 INFO L93 Difference]: Finished difference Result 94 states and 102 transitions. [2019-10-14 23:16:01,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 23:16:01,656 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 51 [2019-10-14 23:16:01,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:01,657 INFO L225 Difference]: With dead ends: 94 [2019-10-14 23:16:01,659 INFO L226 Difference]: Without dead ends: 61 [2019-10-14 23:16:01,660 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=332, Invalid=2020, Unknown=0, NotChecked=0, Total=2352 [2019-10-14 23:16:01,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-10-14 23:16:01,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2019-10-14 23:16:01,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-14 23:16:01,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2019-10-14 23:16:01,675 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 51 [2019-10-14 23:16:01,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:01,676 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2019-10-14 23:16:01,676 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-14 23:16:01,676 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2019-10-14 23:16:01,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-10-14 23:16:01,681 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:01,681 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:01,889 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:01,890 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:01,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:01,891 INFO L82 PathProgramCache]: Analyzing trace with hash 2127028663, now seen corresponding path program 8 times [2019-10-14 23:16:01,891 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:01,891 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745971670] [2019-10-14 23:16:01,892 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:01,892 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:01,892 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:01,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:02,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:02,339 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 0 proven. 372 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:16:02,340 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745971670] [2019-10-14 23:16:02,340 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738793620] [2019-10-14 23:16:02,340 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-10-14 23:16:02,386 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:16:02,386 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:02,387 INFO L256 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 23:16:02,389 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:02,612 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 173 proven. 36 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2019-10-14 23:16:02,612 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:02,612 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 10] total 39 [2019-10-14 23:16:02,612 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750537580] [2019-10-14 23:16:02,613 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-10-14 23:16:02,613 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:02,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-10-14 23:16:02,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1313, Unknown=0, NotChecked=0, Total=1482 [2019-10-14 23:16:02,614 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand 39 states. [2019-10-14 23:16:03,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:03,376 INFO L93 Difference]: Finished difference Result 104 states and 112 transitions. [2019-10-14 23:16:03,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 23:16:03,377 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 57 [2019-10-14 23:16:03,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:03,378 INFO L225 Difference]: With dead ends: 104 [2019-10-14 23:16:03,378 INFO L226 Difference]: Without dead ends: 67 [2019-10-14 23:16:03,379 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=418, Invalid=2552, Unknown=0, NotChecked=0, Total=2970 [2019-10-14 23:16:03,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-10-14 23:16:03,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2019-10-14 23:16:03,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-14 23:16:03,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 67 transitions. [2019-10-14 23:16:03,390 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 67 transitions. Word has length 57 [2019-10-14 23:16:03,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:03,390 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 67 transitions. [2019-10-14 23:16:03,390 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-10-14 23:16:03,390 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 67 transitions. [2019-10-14 23:16:03,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-14 23:16:03,391 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:03,392 INFO L380 BasicCegarLoop]: trace histogram [21, 21, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:03,595 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:03,596 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:03,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:03,597 INFO L82 PathProgramCache]: Analyzing trace with hash -1542827339, now seen corresponding path program 9 times [2019-10-14 23:16:03,597 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:03,598 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344224161] [2019-10-14 23:16:03,598 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:03,598 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:03,598 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:03,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:04,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:04,053 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:16:04,053 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344224161] [2019-10-14 23:16:04,053 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083424597] [2019-10-14 23:16:04,054 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-10-14 23:16:04,101 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2019-10-14 23:16:04,101 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:04,101 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 23:16:04,104 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:04,383 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 231 proven. 49 refuted. 0 times theorem prover too weak. 215 trivial. 0 not checked. [2019-10-14 23:16:04,384 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:04,384 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 11] total 43 [2019-10-14 23:16:04,384 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178781039] [2019-10-14 23:16:04,385 INFO L442 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-10-14 23:16:04,385 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:04,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-10-14 23:16:04,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=1600, Unknown=0, NotChecked=0, Total=1806 [2019-10-14 23:16:04,386 INFO L87 Difference]: Start difference. First operand 64 states and 67 transitions. Second operand 43 states. [2019-10-14 23:16:05,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:05,282 INFO L93 Difference]: Finished difference Result 114 states and 122 transitions. [2019-10-14 23:16:05,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 23:16:05,284 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 63 [2019-10-14 23:16:05,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:05,285 INFO L225 Difference]: With dead ends: 114 [2019-10-14 23:16:05,285 INFO L226 Difference]: Without dead ends: 73 [2019-10-14 23:16:05,287 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=518, Invalid=3142, Unknown=0, NotChecked=0, Total=3660 [2019-10-14 23:16:05,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-10-14 23:16:05,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2019-10-14 23:16:05,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-10-14 23:16:05,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 73 transitions. [2019-10-14 23:16:05,298 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 73 transitions. Word has length 63 [2019-10-14 23:16:05,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:05,299 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 73 transitions. [2019-10-14 23:16:05,299 INFO L463 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-10-14 23:16:05,299 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 73 transitions. [2019-10-14 23:16:05,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-10-14 23:16:05,300 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:05,300 INFO L380 BasicCegarLoop]: trace histogram [24, 24, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:05,506 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:05,507 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:05,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:05,508 INFO L82 PathProgramCache]: Analyzing trace with hash -1910289101, now seen corresponding path program 10 times [2019-10-14 23:16:05,508 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:05,509 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1545171670] [2019-10-14 23:16:05,509 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:05,509 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:05,509 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:05,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:06,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:06,179 INFO L134 CoverageAnalysis]: Checked inductivity of 636 backedges. 0 proven. 636 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:16:06,180 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1545171670] [2019-10-14 23:16:06,180 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166267981] [2019-10-14 23:16:06,180 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 [2019-10-14 23:16:06,246 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:16:06,246 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:06,247 INFO L256 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 23:16:06,250 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:06,554 INFO L134 CoverageAnalysis]: Checked inductivity of 636 backedges. 293 proven. 64 refuted. 0 times theorem prover too weak. 279 trivial. 0 not checked. [2019-10-14 23:16:06,554 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:06,554 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 12] total 47 [2019-10-14 23:16:06,554 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930391877] [2019-10-14 23:16:06,555 INFO L442 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-10-14 23:16:06,555 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:06,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-10-14 23:16:06,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=1915, Unknown=0, NotChecked=0, Total=2162 [2019-10-14 23:16:06,557 INFO L87 Difference]: Start difference. First operand 70 states and 73 transitions. Second operand 47 states. [2019-10-14 23:16:07,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:07,637 INFO L93 Difference]: Finished difference Result 124 states and 132 transitions. [2019-10-14 23:16:07,637 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-14 23:16:07,637 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 69 [2019-10-14 23:16:07,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:07,638 INFO L225 Difference]: With dead ends: 124 [2019-10-14 23:16:07,638 INFO L226 Difference]: Without dead ends: 79 [2019-10-14 23:16:07,642 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 796 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=633, Invalid=3789, Unknown=0, NotChecked=0, Total=4422 [2019-10-14 23:16:07,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-10-14 23:16:07,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2019-10-14 23:16:07,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-10-14 23:16:07,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 79 transitions. [2019-10-14 23:16:07,663 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 79 transitions. Word has length 69 [2019-10-14 23:16:07,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:07,663 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 79 transitions. [2019-10-14 23:16:07,663 INFO L463 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-10-14 23:16:07,664 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 79 transitions. [2019-10-14 23:16:07,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-10-14 23:16:07,666 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:07,667 INFO L380 BasicCegarLoop]: trace histogram [27, 27, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:07,872 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:07,872 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:07,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:07,873 INFO L82 PathProgramCache]: Analyzing trace with hash -1389547215, now seen corresponding path program 11 times [2019-10-14 23:16:07,873 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:07,873 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285401958] [2019-10-14 23:16:07,874 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:07,874 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:07,874 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:07,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:08,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:08,633 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 0 proven. 795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:16:08,633 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285401958] [2019-10-14 23:16:08,633 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17729278] [2019-10-14 23:16:08,634 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2019-10-14 23:16:08,719 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2019-10-14 23:16:08,719 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:08,720 INFO L256 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 23:16:08,723 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:09,044 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 549 proven. 81 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2019-10-14 23:16:09,044 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:09,044 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 13] total 51 [2019-10-14 23:16:09,045 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457696484] [2019-10-14 23:16:09,045 INFO L442 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-10-14 23:16:09,045 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:09,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-10-14 23:16:09,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=2258, Unknown=0, NotChecked=0, Total=2550 [2019-10-14 23:16:09,047 INFO L87 Difference]: Start difference. First operand 76 states and 79 transitions. Second operand 51 states. [2019-10-14 23:16:10,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:10,421 INFO L93 Difference]: Finished difference Result 134 states and 142 transitions. [2019-10-14 23:16:10,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-14 23:16:10,421 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 75 [2019-10-14 23:16:10,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:10,422 INFO L225 Difference]: With dead ends: 134 [2019-10-14 23:16:10,422 INFO L226 Difference]: Without dead ends: 85 [2019-10-14 23:16:10,424 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=901, Invalid=4501, Unknown=0, NotChecked=0, Total=5402 [2019-10-14 23:16:10,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2019-10-14 23:16:10,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2019-10-14 23:16:10,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-10-14 23:16:10,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 85 transitions. [2019-10-14 23:16:10,434 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 85 transitions. Word has length 75 [2019-10-14 23:16:10,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:10,434 INFO L462 AbstractCegarLoop]: Abstraction has 82 states and 85 transitions. [2019-10-14 23:16:10,434 INFO L463 AbstractCegarLoop]: Interpolant automaton has 51 states. [2019-10-14 23:16:10,435 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 85 transitions. [2019-10-14 23:16:10,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-10-14 23:16:10,435 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:10,436 INFO L380 BasicCegarLoop]: trace histogram [30, 30, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:10,640 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:10,640 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:10,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:10,641 INFO L82 PathProgramCache]: Analyzing trace with hash 1348099759, now seen corresponding path program 12 times [2019-10-14 23:16:10,641 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:10,641 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662089415] [2019-10-14 23:16:10,641 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:10,642 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:10,642 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:10,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:10,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:10,721 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-10-14 23:16:10,721 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662089415] [2019-10-14 23:16:10,721 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337837499] [2019-10-14 23:16:10,722 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2019-10-14 23:16:10,818 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 24 check-sat command(s) [2019-10-14 23:16:10,818 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:10,819 INFO L256 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 23:16:10,822 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:10,878 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-10-14 23:16:10,879 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:10,879 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2019-10-14 23:16:10,879 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628416626] [2019-10-14 23:16:10,880 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 23:16:10,880 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:10,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 23:16:10,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=65, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:16:10,881 INFO L87 Difference]: Start difference. First operand 82 states and 85 transitions. Second operand 11 states. [2019-10-14 23:16:10,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:10,951 INFO L93 Difference]: Finished difference Result 132 states and 137 transitions. [2019-10-14 23:16:10,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 23:16:10,952 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 81 [2019-10-14 23:16:10,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:10,953 INFO L225 Difference]: With dead ends: 132 [2019-10-14 23:16:10,953 INFO L226 Difference]: Without dead ends: 127 [2019-10-14 23:16:10,954 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=65, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:16:10,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2019-10-14 23:16:10,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 105. [2019-10-14 23:16:10,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2019-10-14 23:16:10,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 109 transitions. [2019-10-14 23:16:10,984 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 109 transitions. Word has length 81 [2019-10-14 23:16:10,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:10,985 INFO L462 AbstractCegarLoop]: Abstraction has 105 states and 109 transitions. [2019-10-14 23:16:10,985 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 23:16:10,985 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 109 transitions. [2019-10-14 23:16:10,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-10-14 23:16:10,989 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:10,989 INFO L380 BasicCegarLoop]: trace histogram [40, 40, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:11,193 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:11,194 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:11,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:11,194 INFO L82 PathProgramCache]: Analyzing trace with hash -1467049301, now seen corresponding path program 13 times [2019-10-14 23:16:11,194 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:11,195 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035763998] [2019-10-14 23:16:11,195 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:11,195 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:11,195 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:11,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:11,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:11,299 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-10-14 23:16:11,300 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035763998] [2019-10-14 23:16:11,300 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747747997] [2019-10-14 23:16:11,300 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2019-10-14 23:16:11,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:11,374 INFO L256 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 23:16:11,376 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:11,450 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-10-14 23:16:11,451 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:11,451 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2019-10-14 23:16:11,451 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406894150] [2019-10-14 23:16:11,451 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 23:16:11,451 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:11,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 23:16:11,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=93, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:16:11,452 INFO L87 Difference]: Start difference. First operand 105 states and 109 transitions. Second operand 13 states. [2019-10-14 23:16:11,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:11,486 INFO L93 Difference]: Finished difference Result 155 states and 161 transitions. [2019-10-14 23:16:11,487 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 23:16:11,487 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 104 [2019-10-14 23:16:11,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:11,488 INFO L225 Difference]: With dead ends: 155 [2019-10-14 23:16:11,488 INFO L226 Difference]: Without dead ends: 150 [2019-10-14 23:16:11,491 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=63, Invalid=93, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:16:11,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2019-10-14 23:16:11,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 128. [2019-10-14 23:16:11,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2019-10-14 23:16:11,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 133 transitions. [2019-10-14 23:16:11,503 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 133 transitions. Word has length 104 [2019-10-14 23:16:11,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:11,504 INFO L462 AbstractCegarLoop]: Abstraction has 128 states and 133 transitions. [2019-10-14 23:16:11,504 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 23:16:11,504 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 133 transitions. [2019-10-14 23:16:11,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2019-10-14 23:16:11,505 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:11,505 INFO L380 BasicCegarLoop]: trace histogram [50, 50, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:11,708 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:11,709 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:11,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:11,709 INFO L82 PathProgramCache]: Analyzing trace with hash -1018125521, now seen corresponding path program 14 times [2019-10-14 23:16:11,710 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:11,710 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949529368] [2019-10-14 23:16:11,710 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:11,711 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:11,711 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:11,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:11,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:11,840 INFO L134 CoverageAnalysis]: Checked inductivity of 2735 backedges. 0 proven. 2235 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2019-10-14 23:16:11,841 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949529368] [2019-10-14 23:16:11,841 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1257912045] [2019-10-14 23:16:11,841 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-10-14 23:16:11,921 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:16:11,921 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:11,922 INFO L256 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 23:16:11,924 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:12,041 INFO L134 CoverageAnalysis]: Checked inductivity of 2735 backedges. 0 proven. 2235 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2019-10-14 23:16:12,042 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:12,042 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2019-10-14 23:16:12,042 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174533487] [2019-10-14 23:16:12,043 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 23:16:12,043 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:12,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 23:16:12,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=126, Unknown=0, NotChecked=0, Total=210 [2019-10-14 23:16:12,044 INFO L87 Difference]: Start difference. First operand 128 states and 133 transitions. Second operand 15 states. [2019-10-14 23:16:12,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:12,097 INFO L93 Difference]: Finished difference Result 178 states and 185 transitions. [2019-10-14 23:16:12,097 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 23:16:12,098 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 127 [2019-10-14 23:16:12,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:12,099 INFO L225 Difference]: With dead ends: 178 [2019-10-14 23:16:12,099 INFO L226 Difference]: Without dead ends: 173 [2019-10-14 23:16:12,100 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=84, Invalid=126, Unknown=0, NotChecked=0, Total=210 [2019-10-14 23:16:12,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2019-10-14 23:16:12,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 151. [2019-10-14 23:16:12,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2019-10-14 23:16:12,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 157 transitions. [2019-10-14 23:16:12,113 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 157 transitions. Word has length 127 [2019-10-14 23:16:12,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:12,113 INFO L462 AbstractCegarLoop]: Abstraction has 151 states and 157 transitions. [2019-10-14 23:16:12,113 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 23:16:12,114 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 157 transitions. [2019-10-14 23:16:12,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2019-10-14 23:16:12,115 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:12,115 INFO L380 BasicCegarLoop]: trace histogram [60, 60, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:12,319 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:12,319 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:12,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:12,320 INFO L82 PathProgramCache]: Analyzing trace with hash -1416411605, now seen corresponding path program 15 times [2019-10-14 23:16:12,320 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:12,320 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750685980] [2019-10-14 23:16:12,320 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:12,320 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:12,321 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:12,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:12,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:12,509 INFO L134 CoverageAnalysis]: Checked inductivity of 3951 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 600 trivial. 0 not checked. [2019-10-14 23:16:12,510 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750685980] [2019-10-14 23:16:12,510 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1622825874] [2019-10-14 23:16:12,510 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-10-14 23:16:12,626 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2019-10-14 23:16:12,626 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:12,627 INFO L256 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 23:16:12,630 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:12,738 INFO L134 CoverageAnalysis]: Checked inductivity of 3951 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 600 trivial. 0 not checked. [2019-10-14 23:16:12,739 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:12,739 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2019-10-14 23:16:12,739 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739677731] [2019-10-14 23:16:12,739 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 23:16:12,740 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:12,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 23:16:12,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=164, Unknown=0, NotChecked=0, Total=272 [2019-10-14 23:16:12,740 INFO L87 Difference]: Start difference. First operand 151 states and 157 transitions. Second operand 17 states. [2019-10-14 23:16:12,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:12,781 INFO L93 Difference]: Finished difference Result 201 states and 209 transitions. [2019-10-14 23:16:12,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 23:16:12,781 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 150 [2019-10-14 23:16:12,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:12,782 INFO L225 Difference]: With dead ends: 201 [2019-10-14 23:16:12,783 INFO L226 Difference]: Without dead ends: 196 [2019-10-14 23:16:12,783 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=108, Invalid=164, Unknown=0, NotChecked=0, Total=272 [2019-10-14 23:16:12,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2019-10-14 23:16:12,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 174. [2019-10-14 23:16:12,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2019-10-14 23:16:12,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 181 transitions. [2019-10-14 23:16:12,799 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 181 transitions. Word has length 150 [2019-10-14 23:16:12,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:12,800 INFO L462 AbstractCegarLoop]: Abstraction has 174 states and 181 transitions. [2019-10-14 23:16:12,800 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 23:16:12,800 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 181 transitions. [2019-10-14 23:16:12,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2019-10-14 23:16:12,802 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:12,802 INFO L380 BasicCegarLoop]: trace histogram [70, 70, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:13,005 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:13,006 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:13,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:13,007 INFO L82 PathProgramCache]: Analyzing trace with hash -1492973649, now seen corresponding path program 16 times [2019-10-14 23:16:13,007 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:13,007 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275054461] [2019-10-14 23:16:13,008 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:13,008 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:13,008 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:13,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:13,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:13,216 INFO L134 CoverageAnalysis]: Checked inductivity of 5390 backedges. 0 proven. 4690 refuted. 0 times theorem prover too weak. 700 trivial. 0 not checked. [2019-10-14 23:16:13,217 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275054461] [2019-10-14 23:16:13,218 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1789509886] [2019-10-14 23:16:13,218 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 [2019-10-14 23:16:13,318 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:16:13,318 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:13,319 INFO L256 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 23:16:13,321 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:13,442 INFO L134 CoverageAnalysis]: Checked inductivity of 5390 backedges. 0 proven. 4690 refuted. 0 times theorem prover too weak. 700 trivial. 0 not checked. [2019-10-14 23:16:13,443 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:13,443 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2019-10-14 23:16:13,443 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084519399] [2019-10-14 23:16:13,444 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 23:16:13,444 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:13,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 23:16:13,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=207, Unknown=0, NotChecked=0, Total=342 [2019-10-14 23:16:13,444 INFO L87 Difference]: Start difference. First operand 174 states and 181 transitions. Second operand 19 states. [2019-10-14 23:16:13,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:13,517 INFO L93 Difference]: Finished difference Result 224 states and 233 transitions. [2019-10-14 23:16:13,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 23:16:13,517 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 173 [2019-10-14 23:16:13,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:13,519 INFO L225 Difference]: With dead ends: 224 [2019-10-14 23:16:13,519 INFO L226 Difference]: Without dead ends: 219 [2019-10-14 23:16:13,520 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=135, Invalid=207, Unknown=0, NotChecked=0, Total=342 [2019-10-14 23:16:13,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2019-10-14 23:16:13,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 197. [2019-10-14 23:16:13,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2019-10-14 23:16:13,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 205 transitions. [2019-10-14 23:16:13,535 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 205 transitions. Word has length 173 [2019-10-14 23:16:13,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:13,535 INFO L462 AbstractCegarLoop]: Abstraction has 197 states and 205 transitions. [2019-10-14 23:16:13,535 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 23:16:13,535 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 205 transitions. [2019-10-14 23:16:13,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2019-10-14 23:16:13,537 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:13,537 INFO L380 BasicCegarLoop]: trace histogram [80, 80, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:13,741 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:13,741 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:13,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:13,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1547162027, now seen corresponding path program 17 times [2019-10-14 23:16:13,742 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:13,743 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603366861] [2019-10-14 23:16:13,743 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:13,743 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:13,743 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:13,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:13,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:13,984 INFO L134 CoverageAnalysis]: Checked inductivity of 7052 backedges. 0 proven. 6252 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2019-10-14 23:16:13,984 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603366861] [2019-10-14 23:16:13,985 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [183781294] [2019-10-14 23:16:13,985 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2019-10-14 23:16:14,157 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 69 check-sat command(s) [2019-10-14 23:16:14,157 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:14,159 INFO L256 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 23:16:14,162 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:14,324 INFO L134 CoverageAnalysis]: Checked inductivity of 7052 backedges. 0 proven. 6252 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2019-10-14 23:16:14,325 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:14,325 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 21 [2019-10-14 23:16:14,325 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028851596] [2019-10-14 23:16:14,326 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 23:16:14,326 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:14,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 23:16:14,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=255, Unknown=0, NotChecked=0, Total=420 [2019-10-14 23:16:14,326 INFO L87 Difference]: Start difference. First operand 197 states and 205 transitions. Second operand 21 states. [2019-10-14 23:16:14,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:14,409 INFO L93 Difference]: Finished difference Result 247 states and 257 transitions. [2019-10-14 23:16:14,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 23:16:14,409 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 196 [2019-10-14 23:16:14,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:14,411 INFO L225 Difference]: With dead ends: 247 [2019-10-14 23:16:14,411 INFO L226 Difference]: Without dead ends: 242 [2019-10-14 23:16:14,412 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=165, Invalid=255, Unknown=0, NotChecked=0, Total=420 [2019-10-14 23:16:14,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2019-10-14 23:16:14,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 220. [2019-10-14 23:16:14,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2019-10-14 23:16:14,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 229 transitions. [2019-10-14 23:16:14,428 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 229 transitions. Word has length 196 [2019-10-14 23:16:14,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:14,428 INFO L462 AbstractCegarLoop]: Abstraction has 220 states and 229 transitions. [2019-10-14 23:16:14,428 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 23:16:14,428 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 229 transitions. [2019-10-14 23:16:14,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2019-10-14 23:16:14,430 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:14,430 INFO L380 BasicCegarLoop]: trace histogram [90, 90, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:14,639 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:14,639 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:14,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:14,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1463389231, now seen corresponding path program 18 times [2019-10-14 23:16:14,640 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:14,641 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1118743408] [2019-10-14 23:16:14,641 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:14,641 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:14,641 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:14,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:14,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:14,931 INFO L134 CoverageAnalysis]: Checked inductivity of 8937 backedges. 0 proven. 8037 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2019-10-14 23:16:14,931 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1118743408] [2019-10-14 23:16:14,931 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705357369] [2019-10-14 23:16:14,932 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2019-10-14 23:16:15,143 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 70 check-sat command(s) [2019-10-14 23:16:15,143 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:15,145 INFO L256 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 23:16:15,149 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:15,395 INFO L134 CoverageAnalysis]: Checked inductivity of 8937 backedges. 0 proven. 8037 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2019-10-14 23:16:15,395 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:15,396 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2019-10-14 23:16:15,396 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779891008] [2019-10-14 23:16:15,397 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 23:16:15,397 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:15,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 23:16:15,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=308, Unknown=0, NotChecked=0, Total=506 [2019-10-14 23:16:15,398 INFO L87 Difference]: Start difference. First operand 220 states and 229 transitions. Second operand 23 states. [2019-10-14 23:16:15,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:15,490 INFO L93 Difference]: Finished difference Result 270 states and 281 transitions. [2019-10-14 23:16:15,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 23:16:15,491 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 219 [2019-10-14 23:16:15,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:15,492 INFO L225 Difference]: With dead ends: 270 [2019-10-14 23:16:15,493 INFO L226 Difference]: Without dead ends: 265 [2019-10-14 23:16:15,493 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=340, Unknown=0, NotChecked=0, Total=552 [2019-10-14 23:16:15,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2019-10-14 23:16:15,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 243. [2019-10-14 23:16:15,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 243 states. [2019-10-14 23:16:15,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 253 transitions. [2019-10-14 23:16:15,512 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 253 transitions. Word has length 219 [2019-10-14 23:16:15,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:15,513 INFO L462 AbstractCegarLoop]: Abstraction has 243 states and 253 transitions. [2019-10-14 23:16:15,515 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 23:16:15,515 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 253 transitions. [2019-10-14 23:16:15,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2019-10-14 23:16:15,517 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:15,517 INFO L380 BasicCegarLoop]: trace histogram [100, 100, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:15,720 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:15,721 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:15,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:15,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1649132245, now seen corresponding path program 19 times [2019-10-14 23:16:15,722 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:15,722 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138843176] [2019-10-14 23:16:15,722 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:15,723 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:15,723 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:15,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:19,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:19,984 INFO L134 CoverageAnalysis]: Checked inductivity of 11045 backedges. 11036 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 23:16:19,985 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138843176] [2019-10-14 23:16:19,985 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:16:19,985 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [105] imperfect sequences [] total 105 [2019-10-14 23:16:19,985 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678228008] [2019-10-14 23:16:19,985 INFO L442 AbstractCegarLoop]: Interpolant automaton has 105 states [2019-10-14 23:16:19,986 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:19,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2019-10-14 23:16:19,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5257, Invalid=5663, Unknown=0, NotChecked=0, Total=10920 [2019-10-14 23:16:19,989 INFO L87 Difference]: Start difference. First operand 243 states and 253 transitions. Second operand 105 states. [2019-10-14 23:16:21,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:21,902 INFO L93 Difference]: Finished difference Result 9783 states and 10243 transitions. [2019-10-14 23:16:21,902 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2019-10-14 23:16:21,902 INFO L78 Accepts]: Start accepts. Automaton has 105 states. Word has length 242 [2019-10-14 23:16:21,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:21,903 INFO L225 Difference]: With dead ends: 9783 [2019-10-14 23:16:21,903 INFO L226 Difference]: Without dead ends: 0 [2019-10-14 23:16:21,927 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=5261, Invalid=5869, Unknown=0, NotChecked=0, Total=11130 [2019-10-14 23:16:21,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-10-14 23:16:21,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-10-14 23:16:21,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-10-14 23:16:21,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-10-14 23:16:21,928 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 242 [2019-10-14 23:16:21,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:21,929 INFO L462 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-10-14 23:16:21,929 INFO L463 AbstractCegarLoop]: Interpolant automaton has 105 states. [2019-10-14 23:16:21,929 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-10-14 23:16:21,929 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-10-14 23:16:21,934 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2019-10-14 23:16:24,381 WARN L191 SmtUtils]: Spent 2.42 s on a formula simplification. DAG size of input: 699 DAG size of output: 676