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-industry-pattern/nested-3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 23:14:57,821 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 23:14:57,823 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 23:14:57,841 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 23:14:57,842 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 23:14:57,843 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 23:14:57,845 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 23:14:57,854 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 23:14:57,858 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 23:14:57,861 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 23:14:57,862 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 23:14:57,864 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 23:14:57,864 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 23:14:57,866 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 23:14:57,868 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 23:14:57,869 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 23:14:57,871 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 23:14:57,872 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 23:14:57,873 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 23:14:57,877 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 23:14:57,881 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 23:14:57,884 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 23:14:57,886 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 23:14:57,887 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 23:14:57,889 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 23:14:57,893 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 23:14:57,894 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 23:14:57,894 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 23:14:57,895 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 23:14:57,896 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 23:14:57,897 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 23:14:57,897 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 23:14:57,897 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 23:14:57,897 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 23:14:57,898 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 23:14:57,899 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 23:14:57,900 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 23:14:57,934 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 23:14:57,934 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 23:14:57,938 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 23:14:57,938 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 23:14:57,938 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 23:14:57,938 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 23:14:57,939 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 23:14:57,939 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 23:14:57,939 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 23:14:57,939 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 23:14:57,939 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 23:14:57,939 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 23:14:57,940 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 23:14:57,940 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 23:14:57,940 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 23:14:57,941 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 23:14:57,941 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 23:14:57,942 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 23:14:57,942 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 23:14:57,942 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 23:14:57,942 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 23:14:57,942 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 23:14:57,943 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 23:14:57,943 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 23:14:57,943 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 23:14:57,943 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 23:14:57,943 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 23:14:57,943 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 23:14:57,944 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 23:14:58,209 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 23:14:58,232 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 23:14:58,236 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 23:14:58,238 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 23:14:58,238 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 23:14:58,239 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2019-10-14 23:14:58,311 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dd0fc3555/35622076f99e41b482b588043e5cc067/FLAGe4232dcc8 [2019-10-14 23:14:58,789 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 23:14:58,789 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2019-10-14 23:14:58,796 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dd0fc3555/35622076f99e41b482b588043e5cc067/FLAGe4232dcc8 [2019-10-14 23:14:59,145 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dd0fc3555/35622076f99e41b482b588043e5cc067 [2019-10-14 23:14:59,156 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 23:14:59,157 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 23:14:59,158 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 23:14:59,158 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 23:14:59,162 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 23:14:59,163 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:14:59" (1/1) ... [2019-10-14 23:14:59,165 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@377a000 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:59, skipping insertion in model container [2019-10-14 23:14:59,166 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:14:59" (1/1) ... [2019-10-14 23:14:59,173 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 23:14:59,194 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 23:14:59,359 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:14:59,364 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 23:14:59,383 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:14:59,399 INFO L192 MainTranslator]: Completed translation [2019-10-14 23:14:59,399 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:59 WrapperNode [2019-10-14 23:14:59,399 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 23:14:59,400 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 23:14:59,400 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 23:14:59,400 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 23:14:59,505 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:59" (1/1) ... [2019-10-14 23:14:59,505 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:59" (1/1) ... [2019-10-14 23:14:59,513 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:59" (1/1) ... [2019-10-14 23:14:59,515 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:59" (1/1) ... [2019-10-14 23:14:59,519 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:59" (1/1) ... [2019-10-14 23:14:59,525 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:59" (1/1) ... [2019-10-14 23:14:59,529 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:59" (1/1) ... [2019-10-14 23:14:59,534 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 23:14:59,535 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 23:14:59,535 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 23:14:59,535 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 23:14:59,536 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:59" (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 23:14:59,583 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 23:14:59,583 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 23:14:59,583 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 23:14:59,583 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 23:14:59,584 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 23:14:59,584 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 23:14:59,584 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 23:14:59,584 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 23:14:59,584 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 23:14:59,584 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 23:14:59,786 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 23:14:59,786 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-14 23:14:59,787 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:14:59 BoogieIcfgContainer [2019-10-14 23:14:59,787 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 23:14:59,788 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 23:14:59,789 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 23:14:59,791 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 23:14:59,792 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 11:14:59" (1/3) ... [2019-10-14 23:14:59,792 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@546b854 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:14:59, skipping insertion in model container [2019-10-14 23:14:59,793 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:14:59" (2/3) ... [2019-10-14 23:14:59,793 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@546b854 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:14:59, skipping insertion in model container [2019-10-14 23:14:59,793 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:14:59" (3/3) ... [2019-10-14 23:14:59,795 INFO L109 eAbstractionObserver]: Analyzing ICFG nested-3.c [2019-10-14 23:14:59,805 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 23:14:59,813 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 23:14:59,825 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 23:14:59,851 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 23:14:59,851 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 23:14:59,852 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 23:14:59,852 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 23:14:59,852 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 23:14:59,852 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 23:14:59,852 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 23:14:59,853 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 23:14:59,879 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-10-14 23:14:59,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-14 23:14:59,887 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:14:59,888 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:14:59,890 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:14:59,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:14:59,898 INFO L82 PathProgramCache]: Analyzing trace with hash 1419324422, now seen corresponding path program 1 times [2019-10-14 23:14:59,910 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:14:59,911 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709797160] [2019-10-14 23:14:59,911 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:59,912 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:14:59,912 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:00,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:00,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:00,083 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 23:15:00,084 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709797160] [2019-10-14 23:15:00,084 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:15:00,085 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 23:15:00,085 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226828573] [2019-10-14 23:15:00,090 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 23:15:00,090 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:00,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 23:15:00,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:15:00,103 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 4 states. [2019-10-14 23:15:00,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:00,222 INFO L93 Difference]: Finished difference Result 40 states and 61 transitions. [2019-10-14 23:15:00,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 23:15:00,224 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2019-10-14 23:15:00,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:00,233 INFO L225 Difference]: With dead ends: 40 [2019-10-14 23:15:00,233 INFO L226 Difference]: Without dead ends: 23 [2019-10-14 23:15:00,237 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:15:00,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-10-14 23:15:00,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2019-10-14 23:15:00,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-14 23:15:00,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2019-10-14 23:15:00,283 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 14 [2019-10-14 23:15:00,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:00,284 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2019-10-14 23:15:00,284 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 23:15:00,284 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2019-10-14 23:15:00,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 23:15:00,285 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:00,285 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 23:15:00,288 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:00,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:00,289 INFO L82 PathProgramCache]: Analyzing trace with hash -1519544262, now seen corresponding path program 1 times [2019-10-14 23:15:00,289 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:00,290 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664688288] [2019-10-14 23:15:00,290 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:00,290 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:00,291 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:00,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:00,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:00,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:00,362 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664688288] [2019-10-14 23:15:00,362 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [677149650] [2019-10-14 23:15:00,362 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 23:15:00,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:00,409 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-14 23:15:00,416 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:00,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 23:15:00,454 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:15:00,455 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2019-10-14 23:15:00,455 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553975976] [2019-10-14 23:15:00,457 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 23:15:00,457 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:00,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 23:15:00,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2019-10-14 23:15:00,458 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 3 states. [2019-10-14 23:15:00,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:00,506 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2019-10-14 23:15:00,506 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 23:15:00,507 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2019-10-14 23:15:00,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:00,509 INFO L225 Difference]: With dead ends: 37 [2019-10-14 23:15:00,510 INFO L226 Difference]: Without dead ends: 23 [2019-10-14 23:15:00,513 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2019-10-14 23:15:00,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-10-14 23:15:00,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2019-10-14 23:15:00,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-14 23:15:00,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-10-14 23:15:00,534 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 17 [2019-10-14 23:15:00,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:00,535 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-10-14 23:15:00,535 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 23:15:00,536 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-10-14 23:15:00,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 23:15:00,537 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:00,538 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 23:15:00,742 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:00,742 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:00,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:00,743 INFO L82 PathProgramCache]: Analyzing trace with hash -1517697220, now seen corresponding path program 1 times [2019-10-14 23:15:00,743 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:00,744 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088778884] [2019-10-14 23:15:00,744 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:00,744 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:00,744 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:00,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:00,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:00,809 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:00,810 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088778884] [2019-10-14 23:15:00,810 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523756967] [2019-10-14 23:15:00,810 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 23:15:00,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:00,846 INFO L256 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 23:15:00,848 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:00,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:00,853 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:00,853 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 5 [2019-10-14 23:15:00,854 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996873692] [2019-10-14 23:15:00,854 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-14 23:15:00,855 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:00,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-14 23:15:00,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-14 23:15:00,855 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2019-10-14 23:15:00,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:00,939 INFO L93 Difference]: Finished difference Result 42 states and 53 transitions. [2019-10-14 23:15:00,942 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 23:15:00,942 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2019-10-14 23:15:00,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:00,943 INFO L225 Difference]: With dead ends: 42 [2019-10-14 23:15:00,944 INFO L226 Difference]: Without dead ends: 27 [2019-10-14 23:15:00,944 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-14 23:15:00,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-10-14 23:15:00,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2019-10-14 23:15:00,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-14 23:15:00,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2019-10-14 23:15:00,951 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 17 [2019-10-14 23:15:00,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:00,953 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2019-10-14 23:15:00,953 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-14 23:15:00,953 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2019-10-14 23:15:00,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 23:15:00,954 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:00,954 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:01,157 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:01,158 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:01,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:01,159 INFO L82 PathProgramCache]: Analyzing trace with hash -446333304, now seen corresponding path program 2 times [2019-10-14 23:15:01,160 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:01,160 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003046864] [2019-10-14 23:15:01,161 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:01,162 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:01,162 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:01,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:01,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:01,286 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 23:15:01,287 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1003046864] [2019-10-14 23:15:01,288 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118228068] [2019-10-14 23:15:01,288 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 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 23:15:01,319 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:15:01,320 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:01,320 INFO L256 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 23:15:01,322 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:01,378 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 23:15:01,378 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:01,379 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 10 [2019-10-14 23:15:01,379 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963603224] [2019-10-14 23:15:01,380 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 23:15:01,380 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:01,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 23:15:01,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2019-10-14 23:15:01,381 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 10 states. [2019-10-14 23:15:01,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:01,725 INFO L93 Difference]: Finished difference Result 75 states and 100 transitions. [2019-10-14 23:15:01,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 23:15:01,726 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 20 [2019-10-14 23:15:01,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:01,727 INFO L225 Difference]: With dead ends: 75 [2019-10-14 23:15:01,727 INFO L226 Difference]: Without dead ends: 57 [2019-10-14 23:15:01,728 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2019-10-14 23:15:01,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-10-14 23:15:01,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 39. [2019-10-14 23:15:01,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-10-14 23:15:01,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 48 transitions. [2019-10-14 23:15:01,739 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 48 transitions. Word has length 20 [2019-10-14 23:15:01,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:01,739 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 48 transitions. [2019-10-14 23:15:01,739 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 23:15:01,739 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 48 transitions. [2019-10-14 23:15:01,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 23:15:01,740 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:01,740 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:01,953 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:01,953 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:01,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:01,954 INFO L82 PathProgramCache]: Analyzing trace with hash -389075002, now seen corresponding path program 1 times [2019-10-14 23:15:01,954 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:01,955 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876183623] [2019-10-14 23:15:01,955 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:01,956 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:01,956 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:01,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:02,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:02,029 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 23:15:02,030 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876183623] [2019-10-14 23:15:02,030 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [901689139] [2019-10-14 23:15:02,030 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 23:15:02,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:02,065 INFO L256 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 23:15:02,066 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:02,091 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:02,091 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:15:02,091 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2019-10-14 23:15:02,092 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698953976] [2019-10-14 23:15:02,092 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 23:15:02,092 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:02,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 23:15:02,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-10-14 23:15:02,093 INFO L87 Difference]: Start difference. First operand 39 states and 48 transitions. Second operand 4 states. [2019-10-14 23:15:02,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:02,141 INFO L93 Difference]: Finished difference Result 92 states and 119 transitions. [2019-10-14 23:15:02,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 23:15:02,144 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2019-10-14 23:15:02,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:02,146 INFO L225 Difference]: With dead ends: 92 [2019-10-14 23:15:02,146 INFO L226 Difference]: Without dead ends: 59 [2019-10-14 23:15:02,147 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-10-14 23:15:02,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-14 23:15:02,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 48. [2019-10-14 23:15:02,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-10-14 23:15:02,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 60 transitions. [2019-10-14 23:15:02,159 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 60 transitions. Word has length 20 [2019-10-14 23:15:02,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:02,160 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 60 transitions. [2019-10-14 23:15:02,160 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 23:15:02,160 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 60 transitions. [2019-10-14 23:15:02,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 23:15:02,162 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:02,162 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:02,365 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:02,366 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:02,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:02,367 INFO L82 PathProgramCache]: Analyzing trace with hash 290983368, now seen corresponding path program 1 times [2019-10-14 23:15:02,367 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:02,367 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987764999] [2019-10-14 23:15:02,368 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:02,368 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:02,368 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:02,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:02,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:02,415 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 23:15:02,416 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1987764999] [2019-10-14 23:15:02,416 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651248168] [2019-10-14 23:15:02,416 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 23:15:02,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:02,451 INFO L256 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 23:15:02,453 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:02,457 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 23:15:02,458 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:02,458 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2019-10-14 23:15:02,458 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717421177] [2019-10-14 23:15:02,459 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 23:15:02,459 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:02,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 23:15:02,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 23:15:02,460 INFO L87 Difference]: Start difference. First operand 48 states and 60 transitions. Second operand 6 states. [2019-10-14 23:15:02,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:02,531 INFO L93 Difference]: Finished difference Result 110 states and 142 transitions. [2019-10-14 23:15:02,534 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 23:15:02,535 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2019-10-14 23:15:02,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:02,536 INFO L225 Difference]: With dead ends: 110 [2019-10-14 23:15:02,536 INFO L226 Difference]: Without dead ends: 68 [2019-10-14 23:15:02,537 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 23:15:02,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-10-14 23:15:02,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 59. [2019-10-14 23:15:02,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-10-14 23:15:02,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 73 transitions. [2019-10-14 23:15:02,546 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 73 transitions. Word has length 20 [2019-10-14 23:15:02,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:02,547 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 73 transitions. [2019-10-14 23:15:02,547 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 23:15:02,547 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 73 transitions. [2019-10-14 23:15:02,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-14 23:15:02,548 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:02,548 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:02,758 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:02,759 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:02,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:02,759 INFO L82 PathProgramCache]: Analyzing trace with hash 1649593786, now seen corresponding path program 2 times [2019-10-14 23:15:02,759 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:02,760 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [590579811] [2019-10-14 23:15:02,760 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:02,760 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:02,760 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:02,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:02,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:02,826 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:02,827 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [590579811] [2019-10-14 23:15:02,827 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996976909] [2019-10-14 23:15:02,827 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 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 23:15:02,864 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:15:02,864 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:02,865 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 23:15:02,867 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:02,872 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:02,873 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:02,873 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 7 [2019-10-14 23:15:02,874 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744314618] [2019-10-14 23:15:02,874 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 23:15:02,875 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:02,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 23:15:02,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:15:02,875 INFO L87 Difference]: Start difference. First operand 59 states and 73 transitions. Second operand 7 states. [2019-10-14 23:15:02,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:02,969 INFO L93 Difference]: Finished difference Result 133 states and 169 transitions. [2019-10-14 23:15:02,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 23:15:02,972 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-10-14 23:15:02,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:02,974 INFO L225 Difference]: With dead ends: 133 [2019-10-14 23:15:02,974 INFO L226 Difference]: Without dead ends: 80 [2019-10-14 23:15:02,975 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:15:02,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2019-10-14 23:15:02,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 71. [2019-10-14 23:15:02,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-10-14 23:15:02,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 87 transitions. [2019-10-14 23:15:02,988 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 87 transitions. Word has length 23 [2019-10-14 23:15:02,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:02,988 INFO L462 AbstractCegarLoop]: Abstraction has 71 states and 87 transitions. [2019-10-14 23:15:02,988 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 23:15:02,988 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 87 transitions. [2019-10-14 23:15:02,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-14 23:15:02,991 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:02,991 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:03,192 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:03,201 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:03,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:03,201 INFO L82 PathProgramCache]: Analyzing trace with hash 240758920, now seen corresponding path program 3 times [2019-10-14 23:15:03,201 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:03,202 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84966828] [2019-10-14 23:15:03,202 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:03,202 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:03,202 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:03,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:03,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:03,297 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:03,297 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84966828] [2019-10-14 23:15:03,297 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1806990678] [2019-10-14 23:15:03,297 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 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 23:15:03,337 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 23:15:03,337 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:03,338 INFO L256 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-14 23:15:03,340 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:03,430 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 23:15:03,484 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-14 23:15:03,485 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:15:03,485 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 15 [2019-10-14 23:15:03,485 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403792772] [2019-10-14 23:15:03,485 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 23:15:03,486 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:03,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 23:15:03,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2019-10-14 23:15:03,487 INFO L87 Difference]: Start difference. First operand 71 states and 87 transitions. Second operand 9 states. [2019-10-14 23:15:03,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:03,578 INFO L93 Difference]: Finished difference Result 124 states and 151 transitions. [2019-10-14 23:15:03,579 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 23:15:03,579 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2019-10-14 23:15:03,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:03,580 INFO L225 Difference]: With dead ends: 124 [2019-10-14 23:15:03,581 INFO L226 Difference]: Without dead ends: 122 [2019-10-14 23:15:03,581 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2019-10-14 23:15:03,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2019-10-14 23:15:03,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 120. [2019-10-14 23:15:03,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2019-10-14 23:15:03,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 146 transitions. [2019-10-14 23:15:03,596 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 146 transitions. Word has length 26 [2019-10-14 23:15:03,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:03,596 INFO L462 AbstractCegarLoop]: Abstraction has 120 states and 146 transitions. [2019-10-14 23:15:03,596 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 23:15:03,596 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 146 transitions. [2019-10-14 23:15:03,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-14 23:15:03,597 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:03,598 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:03,800 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:03,801 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:03,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:03,802 INFO L82 PathProgramCache]: Analyzing trace with hash -530780410, now seen corresponding path program 1 times [2019-10-14 23:15:03,802 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:03,803 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1520300870] [2019-10-14 23:15:03,803 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:03,803 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:03,803 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:03,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:03,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:03,878 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:03,878 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1520300870] [2019-10-14 23:15:03,879 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [687125221] [2019-10-14 23:15:03,879 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 23:15:03,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:03,903 INFO L256 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 23:15:03,905 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:03,946 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:03,946 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:03,947 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 13 [2019-10-14 23:15:03,947 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194326857] [2019-10-14 23:15:03,947 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 23:15:03,948 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:03,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 23:15:03,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:15:03,948 INFO L87 Difference]: Start difference. First operand 120 states and 146 transitions. Second operand 13 states. [2019-10-14 23:15:04,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:04,177 INFO L93 Difference]: Finished difference Result 263 states and 324 transitions. [2019-10-14 23:15:04,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-14 23:15:04,179 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 26 [2019-10-14 23:15:04,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:04,183 INFO L225 Difference]: With dead ends: 263 [2019-10-14 23:15:04,183 INFO L226 Difference]: Without dead ends: 182 [2019-10-14 23:15:04,188 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=127, Invalid=293, Unknown=0, NotChecked=0, Total=420 [2019-10-14 23:15:04,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2019-10-14 23:15:04,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 141. [2019-10-14 23:15:04,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2019-10-14 23:15:04,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 170 transitions. [2019-10-14 23:15:04,226 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 170 transitions. Word has length 26 [2019-10-14 23:15:04,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:04,227 INFO L462 AbstractCegarLoop]: Abstraction has 141 states and 170 transitions. [2019-10-14 23:15:04,227 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 23:15:04,227 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 170 transitions. [2019-10-14 23:15:04,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-14 23:15:04,230 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:04,230 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:04,434 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:04,434 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:04,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:04,435 INFO L82 PathProgramCache]: Analyzing trace with hash -1873696640, now seen corresponding path program 2 times [2019-10-14 23:15:04,435 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:04,435 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339592756] [2019-10-14 23:15:04,436 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:04,436 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:04,436 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:04,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:04,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:04,540 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:04,540 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339592756] [2019-10-14 23:15:04,540 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021654871] [2019-10-14 23:15:04,541 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 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 23:15:04,591 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:15:04,591 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:04,592 INFO L256 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 23:15:04,593 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:04,620 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-14 23:15:04,621 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:04,621 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 13 [2019-10-14 23:15:04,622 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982019419] [2019-10-14 23:15:04,622 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 23:15:04,623 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:04,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 23:15:04,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:15:04,623 INFO L87 Difference]: Start difference. First operand 141 states and 170 transitions. Second operand 13 states. [2019-10-14 23:15:05,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:05,113 INFO L93 Difference]: Finished difference Result 369 states and 461 transitions. [2019-10-14 23:15:05,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 23:15:05,114 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 29 [2019-10-14 23:15:05,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:05,116 INFO L225 Difference]: With dead ends: 369 [2019-10-14 23:15:05,116 INFO L226 Difference]: Without dead ends: 292 [2019-10-14 23:15:05,117 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=411, Unknown=0, NotChecked=0, Total=552 [2019-10-14 23:15:05,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2019-10-14 23:15:05,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 135. [2019-10-14 23:15:05,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2019-10-14 23:15:05,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 164 transitions. [2019-10-14 23:15:05,133 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 164 transitions. Word has length 29 [2019-10-14 23:15:05,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:05,134 INFO L462 AbstractCegarLoop]: Abstraction has 135 states and 164 transitions. [2019-10-14 23:15:05,134 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 23:15:05,134 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 164 transitions. [2019-10-14 23:15:05,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-14 23:15:05,135 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:05,135 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:05,348 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:05,349 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:05,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:05,350 INFO L82 PathProgramCache]: Analyzing trace with hash 1706989628, now seen corresponding path program 3 times [2019-10-14 23:15:05,350 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:05,350 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078201658] [2019-10-14 23:15:05,351 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:05,351 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:05,351 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:05,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:05,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:05,424 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:05,424 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078201658] [2019-10-14 23:15:05,424 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128481772] [2019-10-14 23:15:05,424 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 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 23:15:05,451 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-14 23:15:05,451 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:05,452 INFO L256 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 23:15:05,453 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:05,486 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-10-14 23:15:05,487 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:15:05,487 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [11] total 13 [2019-10-14 23:15:05,487 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850831514] [2019-10-14 23:15:05,488 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 23:15:05,488 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:05,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 23:15:05,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:15:05,489 INFO L87 Difference]: Start difference. First operand 135 states and 164 transitions. Second operand 4 states. [2019-10-14 23:15:05,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:05,562 INFO L93 Difference]: Finished difference Result 253 states and 309 transitions. [2019-10-14 23:15:05,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 23:15:05,563 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 29 [2019-10-14 23:15:05,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:05,564 INFO L225 Difference]: With dead ends: 253 [2019-10-14 23:15:05,564 INFO L226 Difference]: Without dead ends: 179 [2019-10-14 23:15:05,565 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2019-10-14 23:15:05,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2019-10-14 23:15:05,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 141. [2019-10-14 23:15:05,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2019-10-14 23:15:05,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 170 transitions. [2019-10-14 23:15:05,599 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 170 transitions. Word has length 29 [2019-10-14 23:15:05,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:05,600 INFO L462 AbstractCegarLoop]: Abstraction has 141 states and 170 transitions. [2019-10-14 23:15:05,600 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 23:15:05,600 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 170 transitions. [2019-10-14 23:15:05,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-14 23:15:05,601 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:05,601 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:05,808 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:05,808 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:05,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:05,809 INFO L82 PathProgramCache]: Analyzing trace with hash -252932420, now seen corresponding path program 4 times [2019-10-14 23:15:05,809 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:05,809 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296851794] [2019-10-14 23:15:05,809 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:05,809 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:05,809 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:05,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:05,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:05,864 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:05,864 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296851794] [2019-10-14 23:15:05,865 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483216139] [2019-10-14 23:15:05,865 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 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 23:15:05,894 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:15:05,895 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:05,895 INFO L256 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 23:15:05,901 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:05,908 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:05,908 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:05,908 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 9 [2019-10-14 23:15:05,908 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714840697] [2019-10-14 23:15:05,909 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 23:15:05,909 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:05,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 23:15:05,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:15:05,909 INFO L87 Difference]: Start difference. First operand 141 states and 170 transitions. Second operand 9 states. [2019-10-14 23:15:06,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:06,002 INFO L93 Difference]: Finished difference Result 276 states and 340 transitions. [2019-10-14 23:15:06,002 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 23:15:06,002 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2019-10-14 23:15:06,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:06,004 INFO L225 Difference]: With dead ends: 276 [2019-10-14 23:15:06,004 INFO L226 Difference]: Without dead ends: 182 [2019-10-14 23:15:06,005 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:15:06,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2019-10-14 23:15:06,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 162. [2019-10-14 23:15:06,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2019-10-14 23:15:06,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 194 transitions. [2019-10-14 23:15:06,019 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 194 transitions. Word has length 29 [2019-10-14 23:15:06,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:06,019 INFO L462 AbstractCegarLoop]: Abstraction has 162 states and 194 transitions. [2019-10-14 23:15:06,019 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 23:15:06,019 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 194 transitions. [2019-10-14 23:15:06,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-14 23:15:06,020 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:06,021 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:06,225 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:06,225 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:06,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:06,225 INFO L82 PathProgramCache]: Analyzing trace with hash -1328098874, now seen corresponding path program 5 times [2019-10-14 23:15:06,225 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:06,226 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428036920] [2019-10-14 23:15:06,226 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:06,226 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:06,226 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:06,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:06,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:06,293 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:06,294 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428036920] [2019-10-14 23:15:06,294 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [545695356] [2019-10-14 23:15:06,294 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 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 23:15:06,333 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-10-14 23:15:06,334 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:06,334 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 23:15:06,336 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:06,353 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:06,354 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:06,354 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 10 [2019-10-14 23:15:06,354 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111594894] [2019-10-14 23:15:06,355 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 23:15:06,355 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:06,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 23:15:06,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 23:15:06,357 INFO L87 Difference]: Start difference. First operand 162 states and 194 transitions. Second operand 10 states. [2019-10-14 23:15:06,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:06,484 INFO L93 Difference]: Finished difference Result 309 states and 378 transitions. [2019-10-14 23:15:06,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 23:15:06,484 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2019-10-14 23:15:06,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:06,486 INFO L225 Difference]: With dead ends: 309 [2019-10-14 23:15:06,486 INFO L226 Difference]: Without dead ends: 203 [2019-10-14 23:15:06,487 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 23:15:06,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2019-10-14 23:15:06,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 183. [2019-10-14 23:15:06,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2019-10-14 23:15:06,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 218 transitions. [2019-10-14 23:15:06,503 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 218 transitions. Word has length 32 [2019-10-14 23:15:06,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:06,503 INFO L462 AbstractCegarLoop]: Abstraction has 183 states and 218 transitions. [2019-10-14 23:15:06,503 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 23:15:06,503 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 218 transitions. [2019-10-14 23:15:06,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-14 23:15:06,506 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:06,506 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:06,707 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:06,708 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:06,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:06,709 INFO L82 PathProgramCache]: Analyzing trace with hash 254163580, now seen corresponding path program 6 times [2019-10-14 23:15:06,709 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:06,709 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [830959995] [2019-10-14 23:15:06,709 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:06,710 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:06,710 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:06,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:06,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:06,796 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:06,796 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [830959995] [2019-10-14 23:15:06,796 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302894271] [2019-10-14 23:15:06,796 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 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 23:15:06,834 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-10-14 23:15:06,834 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:06,835 INFO L256 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 23:15:06,836 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:06,945 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 23:15:06,988 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-10-14 23:15:06,988 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:15:06,988 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [11] total 18 [2019-10-14 23:15:06,988 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746014900] [2019-10-14 23:15:06,989 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 23:15:06,989 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:06,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 23:15:06,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2019-10-14 23:15:06,990 INFO L87 Difference]: Start difference. First operand 183 states and 218 transitions. Second operand 9 states. [2019-10-14 23:15:07,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:07,122 INFO L93 Difference]: Finished difference Result 192 states and 227 transitions. [2019-10-14 23:15:07,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 23:15:07,122 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2019-10-14 23:15:07,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:07,124 INFO L225 Difference]: With dead ends: 192 [2019-10-14 23:15:07,124 INFO L226 Difference]: Without dead ends: 190 [2019-10-14 23:15:07,125 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2019-10-14 23:15:07,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2019-10-14 23:15:07,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 183. [2019-10-14 23:15:07,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2019-10-14 23:15:07,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 218 transitions. [2019-10-14 23:15:07,137 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 218 transitions. Word has length 35 [2019-10-14 23:15:07,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:07,137 INFO L462 AbstractCegarLoop]: Abstraction has 183 states and 218 transitions. [2019-10-14 23:15:07,137 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 23:15:07,137 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 218 transitions. [2019-10-14 23:15:07,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-14 23:15:07,138 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:07,138 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:07,351 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:07,351 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:07,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:07,352 INFO L82 PathProgramCache]: Analyzing trace with hash 989633210, now seen corresponding path program 1 times [2019-10-14 23:15:07,352 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:07,353 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181919569] [2019-10-14 23:15:07,353 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:07,353 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:07,353 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:07,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:07,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:07,394 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-10-14 23:15:07,394 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181919569] [2019-10-14 23:15:07,394 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:15:07,395 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-14 23:15:07,395 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116884517] [2019-10-14 23:15:07,395 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-14 23:15:07,395 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:07,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-14 23:15:07,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-14 23:15:07,396 INFO L87 Difference]: Start difference. First operand 183 states and 218 transitions. Second operand 5 states. [2019-10-14 23:15:07,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:07,437 INFO L93 Difference]: Finished difference Result 291 states and 351 transitions. [2019-10-14 23:15:07,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 23:15:07,438 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 35 [2019-10-14 23:15:07,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:07,439 INFO L225 Difference]: With dead ends: 291 [2019-10-14 23:15:07,439 INFO L226 Difference]: Without dead ends: 190 [2019-10-14 23:15:07,440 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-14 23:15:07,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2019-10-14 23:15:07,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 179. [2019-10-14 23:15:07,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2019-10-14 23:15:07,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 212 transitions. [2019-10-14 23:15:07,454 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 212 transitions. Word has length 35 [2019-10-14 23:15:07,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:07,455 INFO L462 AbstractCegarLoop]: Abstraction has 179 states and 212 transitions. [2019-10-14 23:15:07,455 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-14 23:15:07,455 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 212 transitions. [2019-10-14 23:15:07,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-10-14 23:15:07,456 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:07,456 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 12, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:07,456 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:07,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:07,457 INFO L82 PathProgramCache]: Analyzing trace with hash 75585305, now seen corresponding path program 1 times [2019-10-14 23:15:07,457 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:07,457 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513390940] [2019-10-14 23:15:07,457 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:07,457 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:07,458 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:07,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:07,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:07,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:07,684 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 19 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:07,684 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513390940] [2019-10-14 23:15:07,684 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942593561] [2019-10-14 23:15:07,684 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 23:15:07,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:07,725 INFO L256 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 23:15:07,727 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:07,837 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 163 proven. 70 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-10-14 23:15:07,838 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:07,838 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 10] total 28 [2019-10-14 23:15:07,838 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828690667] [2019-10-14 23:15:07,839 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-14 23:15:07,839 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:07,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-14 23:15:07,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=555, Unknown=0, NotChecked=0, Total=756 [2019-10-14 23:15:07,846 INFO L87 Difference]: Start difference. First operand 179 states and 212 transitions. Second operand 28 states. [2019-10-14 23:15:08,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:08,369 INFO L93 Difference]: Finished difference Result 409 states and 481 transitions. [2019-10-14 23:15:08,369 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-14 23:15:08,369 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 65 [2019-10-14 23:15:08,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:08,371 INFO L225 Difference]: With dead ends: 409 [2019-10-14 23:15:08,371 INFO L226 Difference]: Without dead ends: 295 [2019-10-14 23:15:08,373 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=581, Invalid=1675, Unknown=0, NotChecked=0, Total=2256 [2019-10-14 23:15:08,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2019-10-14 23:15:08,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 200. [2019-10-14 23:15:08,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2019-10-14 23:15:08,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 236 transitions. [2019-10-14 23:15:08,392 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 236 transitions. Word has length 65 [2019-10-14 23:15:08,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:08,395 INFO L462 AbstractCegarLoop]: Abstraction has 200 states and 236 transitions. [2019-10-14 23:15:08,395 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-14 23:15:08,395 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 236 transitions. [2019-10-14 23:15:08,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-10-14 23:15:08,396 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:08,396 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:08,599 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:08,600 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:08,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:08,600 INFO L82 PathProgramCache]: Analyzing trace with hash 1121061563, now seen corresponding path program 2 times [2019-10-14 23:15:08,601 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:08,601 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976060417] [2019-10-14 23:15:08,601 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:08,601 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:08,601 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:08,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:08,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:08,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:08,880 INFO L134 CoverageAnalysis]: Checked inductivity of 399 backedges. 21 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:08,880 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976060417] [2019-10-14 23:15:08,881 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956312278] [2019-10-14 23:15:08,881 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 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 23:15:08,924 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:15:08,924 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:08,925 INFO L256 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 23:15:08,926 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:09,034 INFO L134 CoverageAnalysis]: Checked inductivity of 399 backedges. 210 proven. 92 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2019-10-14 23:15:09,034 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:09,034 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 11] total 31 [2019-10-14 23:15:09,035 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577667320] [2019-10-14 23:15:09,035 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-14 23:15:09,035 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:09,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-14 23:15:09,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=682, Unknown=0, NotChecked=0, Total=930 [2019-10-14 23:15:09,036 INFO L87 Difference]: Start difference. First operand 200 states and 236 transitions. Second operand 31 states. [2019-10-14 23:15:09,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:09,757 INFO L93 Difference]: Finished difference Result 469 states and 546 transitions. [2019-10-14 23:15:09,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-10-14 23:15:09,758 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 71 [2019-10-14 23:15:09,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:09,760 INFO L225 Difference]: With dead ends: 469 [2019-10-14 23:15:09,760 INFO L226 Difference]: Without dead ends: 343 [2019-10-14 23:15:09,761 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=798, Invalid=2282, Unknown=0, NotChecked=0, Total=3080 [2019-10-14 23:15:09,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2019-10-14 23:15:09,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 221. [2019-10-14 23:15:09,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 221 states. [2019-10-14 23:15:09,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 260 transitions. [2019-10-14 23:15:09,775 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 260 transitions. Word has length 71 [2019-10-14 23:15:09,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:09,775 INFO L462 AbstractCegarLoop]: Abstraction has 221 states and 260 transitions. [2019-10-14 23:15:09,775 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-14 23:15:09,776 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 260 transitions. [2019-10-14 23:15:09,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-10-14 23:15:09,777 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:09,777 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:09,980 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:09,981 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:09,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:09,981 INFO L82 PathProgramCache]: Analyzing trace with hash -1811685799, now seen corresponding path program 3 times [2019-10-14 23:15:09,982 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:09,982 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201366768] [2019-10-14 23:15:09,982 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:09,982 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:09,983 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:09,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:10,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:10,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:10,334 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 23 proven. 479 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:10,335 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201366768] [2019-10-14 23:15:10,336 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409086516] [2019-10-14 23:15:10,336 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 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 23:15:10,396 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 23:15:10,396 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:10,397 INFO L256 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-14 23:15:10,400 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:10,518 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 23:15:10,563 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 27 proven. 266 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2019-10-14 23:15:10,563 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:10,563 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 10] total 33 [2019-10-14 23:15:10,563 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663014626] [2019-10-14 23:15:10,564 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-14 23:15:10,564 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:10,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-14 23:15:10,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=888, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 23:15:10,565 INFO L87 Difference]: Start difference. First operand 221 states and 260 transitions. Second operand 33 states. [2019-10-14 23:15:14,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:14,396 INFO L93 Difference]: Finished difference Result 959 states and 1121 transitions. [2019-10-14 23:15:14,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2019-10-14 23:15:14,397 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 77 [2019-10-14 23:15:14,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:14,405 INFO L225 Difference]: With dead ends: 959 [2019-10-14 23:15:14,405 INFO L226 Difference]: Without dead ends: 895 [2019-10-14 23:15:14,413 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7334 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3114, Invalid=16068, Unknown=0, NotChecked=0, Total=19182 [2019-10-14 23:15:14,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 895 states. [2019-10-14 23:15:14,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 895 to 559. [2019-10-14 23:15:14,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 559 states. [2019-10-14 23:15:14,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 559 states to 559 states and 649 transitions. [2019-10-14 23:15:14,463 INFO L78 Accepts]: Start accepts. Automaton has 559 states and 649 transitions. Word has length 77 [2019-10-14 23:15:14,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:14,464 INFO L462 AbstractCegarLoop]: Abstraction has 559 states and 649 transitions. [2019-10-14 23:15:14,464 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-14 23:15:14,464 INFO L276 IsEmpty]: Start isEmpty. Operand 559 states and 649 transitions. [2019-10-14 23:15:14,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-10-14 23:15:14,468 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:14,468 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:14,671 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:14,671 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:14,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:14,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1598348699, now seen corresponding path program 1 times [2019-10-14 23:15:14,672 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:14,672 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828002447] [2019-10-14 23:15:14,672 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:14,672 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:14,672 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:14,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:15,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:15,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:15,063 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 108 proven. 394 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:15,064 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828002447] [2019-10-14 23:15:15,064 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719669896] [2019-10-14 23:15:15,064 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 23:15:15,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:15,126 INFO L256 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 23:15:15,128 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:15,311 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 263 proven. 117 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2019-10-14 23:15:15,311 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:15,312 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 12] total 37 [2019-10-14 23:15:15,312 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643004360] [2019-10-14 23:15:15,313 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-10-14 23:15:15,313 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:15,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-10-14 23:15:15,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1139, Unknown=0, NotChecked=0, Total=1332 [2019-10-14 23:15:15,314 INFO L87 Difference]: Start difference. First operand 559 states and 649 transitions. Second operand 37 states. [2019-10-14 23:15:16,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:16,156 INFO L93 Difference]: Finished difference Result 1098 states and 1270 transitions. [2019-10-14 23:15:16,156 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-10-14 23:15:16,156 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 77 [2019-10-14 23:15:16,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:16,162 INFO L225 Difference]: With dead ends: 1098 [2019-10-14 23:15:16,163 INFO L226 Difference]: Without dead ends: 645 [2019-10-14 23:15:16,165 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1171 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=912, Invalid=3378, Unknown=0, NotChecked=0, Total=4290 [2019-10-14 23:15:16,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 645 states. [2019-10-14 23:15:16,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 645 to 377. [2019-10-14 23:15:16,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2019-10-14 23:15:16,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 446 transitions. [2019-10-14 23:15:16,197 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 446 transitions. Word has length 77 [2019-10-14 23:15:16,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:16,198 INFO L462 AbstractCegarLoop]: Abstraction has 377 states and 446 transitions. [2019-10-14 23:15:16,198 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-10-14 23:15:16,198 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 446 transitions. [2019-10-14 23:15:16,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-10-14 23:15:16,201 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:16,201 INFO L380 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:16,406 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:16,406 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:16,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:16,407 INFO L82 PathProgramCache]: Analyzing trace with hash 264763513, now seen corresponding path program 2 times [2019-10-14 23:15:16,407 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:16,407 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606084259] [2019-10-14 23:15:16,407 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:16,407 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:16,408 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:16,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:16,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:16,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:16,836 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 134 proven. 483 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:16,836 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606084259] [2019-10-14 23:15:16,836 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [458922542] [2019-10-14 23:15:16,836 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 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 23:15:16,896 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:15:16,896 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:16,897 INFO L256 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 23:15:16,899 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:16,948 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 6 proven. 151 refuted. 0 times theorem prover too weak. 460 trivial. 0 not checked. [2019-10-14 23:15:16,948 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:16,948 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 7] total 34 [2019-10-14 23:15:16,948 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630108133] [2019-10-14 23:15:16,949 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-14 23:15:16,949 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:16,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-14 23:15:16,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=954, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 23:15:16,950 INFO L87 Difference]: Start difference. First operand 377 states and 446 transitions. Second operand 34 states. [2019-10-14 23:15:19,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:19,453 INFO L93 Difference]: Finished difference Result 1977 states and 2283 transitions. [2019-10-14 23:15:19,454 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2019-10-14 23:15:19,454 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 83 [2019-10-14 23:15:19,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:19,464 INFO L225 Difference]: With dead ends: 1977 [2019-10-14 23:15:19,464 INFO L226 Difference]: Without dead ends: 1798 [2019-10-14 23:15:19,467 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1982 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1794, Invalid=6216, Unknown=0, NotChecked=0, Total=8010 [2019-10-14 23:15:19,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1798 states. [2019-10-14 23:15:19,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1798 to 674. [2019-10-14 23:15:19,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 674 states. [2019-10-14 23:15:19,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 674 states to 674 states and 787 transitions. [2019-10-14 23:15:19,539 INFO L78 Accepts]: Start accepts. Automaton has 674 states and 787 transitions. Word has length 83 [2019-10-14 23:15:19,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:19,539 INFO L462 AbstractCegarLoop]: Abstraction has 674 states and 787 transitions. [2019-10-14 23:15:19,540 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-14 23:15:19,540 INFO L276 IsEmpty]: Start isEmpty. Operand 674 states and 787 transitions. [2019-10-14 23:15:19,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-10-14 23:15:19,541 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:19,542 INFO L380 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:19,747 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:19,747 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:19,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:19,748 INFO L82 PathProgramCache]: Analyzing trace with hash 504104765, now seen corresponding path program 3 times [2019-10-14 23:15:19,748 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:19,749 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139037467] [2019-10-14 23:15:19,749 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:19,749 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:19,749 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:19,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:20,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:20,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:20,114 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 134 proven. 483 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:20,114 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [139037467] [2019-10-14 23:15:20,115 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865895473] [2019-10-14 23:15:20,115 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:20,181 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 23:15:20,181 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:20,182 INFO L256 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-14 23:15:20,183 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:20,381 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 23:15:20,446 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 30 proven. 325 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2019-10-14 23:15:20,446 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:20,446 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 10] total 40 [2019-10-14 23:15:20,446 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497912323] [2019-10-14 23:15:20,447 INFO L442 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-10-14 23:15:20,447 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:20,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-10-14 23:15:20,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1390, Unknown=0, NotChecked=0, Total=1560 [2019-10-14 23:15:20,448 INFO L87 Difference]: Start difference. First operand 674 states and 787 transitions. Second operand 40 states. [2019-10-14 23:15:25,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:25,969 INFO L93 Difference]: Finished difference Result 2040 states and 2317 transitions. [2019-10-14 23:15:25,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2019-10-14 23:15:25,969 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 83 [2019-10-14 23:15:25,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:25,978 INFO L225 Difference]: With dead ends: 2040 [2019-10-14 23:15:25,979 INFO L226 Difference]: Without dead ends: 1706 [2019-10-14 23:15:25,986 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11510 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=4468, Invalid=26684, Unknown=0, NotChecked=0, Total=31152 [2019-10-14 23:15:25,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1706 states. [2019-10-14 23:15:26,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1706 to 908. [2019-10-14 23:15:26,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 908 states. [2019-10-14 23:15:26,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 908 states to 908 states and 1051 transitions. [2019-10-14 23:15:26,074 INFO L78 Accepts]: Start accepts. Automaton has 908 states and 1051 transitions. Word has length 83 [2019-10-14 23:15:26,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:26,074 INFO L462 AbstractCegarLoop]: Abstraction has 908 states and 1051 transitions. [2019-10-14 23:15:26,074 INFO L463 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-10-14 23:15:26,074 INFO L276 IsEmpty]: Start isEmpty. Operand 908 states and 1051 transitions. [2019-10-14 23:15:26,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-10-14 23:15:26,076 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:26,076 INFO L380 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:26,279 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:26,280 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:26,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:26,280 INFO L82 PathProgramCache]: Analyzing trace with hash -1928827587, now seen corresponding path program 4 times [2019-10-14 23:15:26,280 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:26,281 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079667580] [2019-10-14 23:15:26,281 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:26,281 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:26,281 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:26,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:26,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:26,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:26,521 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 306 proven. 311 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:26,522 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079667580] [2019-10-14 23:15:26,522 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [612474716] [2019-10-14 23:15:26,522 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:26,602 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:15:26,602 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:26,603 INFO L256 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 23:15:26,604 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:26,785 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 452 proven. 39 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2019-10-14 23:15:26,786 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:26,786 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 14] total 41 [2019-10-14 23:15:26,786 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904579156] [2019-10-14 23:15:26,786 INFO L442 AbstractCegarLoop]: Interpolant automaton has 41 states [2019-10-14 23:15:26,786 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:26,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2019-10-14 23:15:26,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=336, Invalid=1304, Unknown=0, NotChecked=0, Total=1640 [2019-10-14 23:15:26,787 INFO L87 Difference]: Start difference. First operand 908 states and 1051 transitions. Second operand 41 states. [2019-10-14 23:15:29,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:29,092 INFO L93 Difference]: Finished difference Result 2053 states and 2376 transitions. [2019-10-14 23:15:29,096 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-10-14 23:15:29,096 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 83 [2019-10-14 23:15:29,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:29,102 INFO L225 Difference]: With dead ends: 2053 [2019-10-14 23:15:29,102 INFO L226 Difference]: Without dead ends: 1527 [2019-10-14 23:15:29,104 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2242 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=969, Invalid=6171, Unknown=0, NotChecked=0, Total=7140 [2019-10-14 23:15:29,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1527 states. [2019-10-14 23:15:29,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1527 to 1247. [2019-10-14 23:15:29,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1247 states. [2019-10-14 23:15:29,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1247 states to 1247 states and 1434 transitions. [2019-10-14 23:15:29,207 INFO L78 Accepts]: Start accepts. Automaton has 1247 states and 1434 transitions. Word has length 83 [2019-10-14 23:15:29,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:29,207 INFO L462 AbstractCegarLoop]: Abstraction has 1247 states and 1434 transitions. [2019-10-14 23:15:29,207 INFO L463 AbstractCegarLoop]: Interpolant automaton has 41 states. [2019-10-14 23:15:29,208 INFO L276 IsEmpty]: Start isEmpty. Operand 1247 states and 1434 transitions. [2019-10-14 23:15:29,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-10-14 23:15:29,210 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:29,210 INFO L380 BasicCegarLoop]: trace histogram [21, 21, 20, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:29,413 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:29,413 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:29,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:29,414 INFO L82 PathProgramCache]: Analyzing trace with hash -1853082235, now seen corresponding path program 5 times [2019-10-14 23:15:29,414 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:29,415 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614519819] [2019-10-14 23:15:29,415 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:29,415 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:29,415 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:29,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:29,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:29,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:29,700 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 355 proven. 323 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 23:15:29,701 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614519819] [2019-10-14 23:15:29,701 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1168741444] [2019-10-14 23:15:29,701 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:29,792 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-14 23:15:29,792 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:29,793 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 23:15:29,795 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:29,830 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 353 proven. 176 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2019-10-14 23:15:29,831 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:29,831 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 14] total 28 [2019-10-14 23:15:29,831 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580665956] [2019-10-14 23:15:29,832 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-14 23:15:29,832 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:29,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-14 23:15:29,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=472, Unknown=0, NotChecked=0, Total=756 [2019-10-14 23:15:29,833 INFO L87 Difference]: Start difference. First operand 1247 states and 1434 transitions. Second operand 28 states. [2019-10-14 23:15:30,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:30,064 INFO L93 Difference]: Finished difference Result 2328 states and 2723 transitions. [2019-10-14 23:15:30,065 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-14 23:15:30,065 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 86 [2019-10-14 23:15:30,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:30,068 INFO L225 Difference]: With dead ends: 2328 [2019-10-14 23:15:30,068 INFO L226 Difference]: Without dead ends: 1196 [2019-10-14 23:15:30,071 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=288, Invalid=524, Unknown=0, NotChecked=0, Total=812 [2019-10-14 23:15:30,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1196 states. [2019-10-14 23:15:30,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1196 to 987. [2019-10-14 23:15:30,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 987 states. [2019-10-14 23:15:30,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 987 states to 987 states and 1131 transitions. [2019-10-14 23:15:30,142 INFO L78 Accepts]: Start accepts. Automaton has 987 states and 1131 transitions. Word has length 86 [2019-10-14 23:15:30,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:30,142 INFO L462 AbstractCegarLoop]: Abstraction has 987 states and 1131 transitions. [2019-10-14 23:15:30,142 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-14 23:15:30,142 INFO L276 IsEmpty]: Start isEmpty. Operand 987 states and 1131 transitions. [2019-10-14 23:15:30,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2019-10-14 23:15:30,144 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:30,144 INFO L380 BasicCegarLoop]: trace histogram [24, 24, 22, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:30,348 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:30,348 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:30,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:30,349 INFO L82 PathProgramCache]: Analyzing trace with hash 1132135865, now seen corresponding path program 6 times [2019-10-14 23:15:30,349 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:30,349 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775064124] [2019-10-14 23:15:30,349 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:30,349 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:30,350 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:30,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:30,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:30,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:30,664 INFO L134 CoverageAnalysis]: Checked inductivity of 883 backedges. 438 proven. 445 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:15:30,664 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775064124] [2019-10-14 23:15:30,664 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772681940] [2019-10-14 23:15:30,665 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:30,737 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-10-14 23:15:30,737 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:30,738 INFO L256 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-14 23:15:30,740 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:30,892 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 23:15:30,943 INFO L134 CoverageAnalysis]: Checked inductivity of 883 backedges. 36 proven. 461 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2019-10-14 23:15:30,943 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:30,943 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 10] total 41 [2019-10-14 23:15:30,944 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308414396] [2019-10-14 23:15:30,944 INFO L442 AbstractCegarLoop]: Interpolant automaton has 41 states [2019-10-14 23:15:30,944 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:30,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2019-10-14 23:15:30,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=365, Invalid=1275, Unknown=0, NotChecked=0, Total=1640 [2019-10-14 23:15:30,945 INFO L87 Difference]: Start difference. First operand 987 states and 1131 transitions. Second operand 41 states. [2019-10-14 23:15:33,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:33,261 INFO L93 Difference]: Finished difference Result 1398 states and 1585 transitions. [2019-10-14 23:15:33,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2019-10-14 23:15:33,262 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 95 [2019-10-14 23:15:33,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:33,268 INFO L225 Difference]: With dead ends: 1398 [2019-10-14 23:15:33,269 INFO L226 Difference]: Without dead ends: 1328 [2019-10-14 23:15:33,271 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5700 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2125, Invalid=12881, Unknown=0, NotChecked=0, Total=15006 [2019-10-14 23:15:33,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1328 states. [2019-10-14 23:15:33,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1328 to 1033. [2019-10-14 23:15:33,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1033 states. [2019-10-14 23:15:33,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1033 states to 1033 states and 1185 transitions. [2019-10-14 23:15:33,343 INFO L78 Accepts]: Start accepts. Automaton has 1033 states and 1185 transitions. Word has length 95 [2019-10-14 23:15:33,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:33,344 INFO L462 AbstractCegarLoop]: Abstraction has 1033 states and 1185 transitions. [2019-10-14 23:15:33,344 INFO L463 AbstractCegarLoop]: Interpolant automaton has 41 states. [2019-10-14 23:15:33,344 INFO L276 IsEmpty]: Start isEmpty. Operand 1033 states and 1185 transitions. [2019-10-14 23:15:33,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2019-10-14 23:15:33,348 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:33,348 INFO L380 BasicCegarLoop]: trace histogram [36, 36, 33, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:33,551 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:33,552 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:33,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:33,552 INFO L82 PathProgramCache]: Analyzing trace with hash 504488552, now seen corresponding path program 4 times [2019-10-14 23:15:33,553 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:33,553 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10796629] [2019-10-14 23:15:33,553 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:33,553 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:33,554 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:33,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:34,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:34,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:34,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:34,600 INFO L134 CoverageAnalysis]: Checked inductivity of 2021 backedges. 41 proven. 1976 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 23:15:34,600 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10796629] [2019-10-14 23:15:34,600 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [100027054] [2019-10-14 23:15:34,600 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:34,709 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:15:34,709 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:34,710 INFO L256 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 23:15:34,711 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:34,941 INFO L134 CoverageAnalysis]: Checked inductivity of 2021 backedges. 916 proven. 210 refuted. 0 times theorem prover too weak. 895 trivial. 0 not checked. [2019-10-14 23:15:34,941 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:34,941 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 15] total 57 [2019-10-14 23:15:34,941 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209846601] [2019-10-14 23:15:34,942 INFO L442 AbstractCegarLoop]: Interpolant automaton has 57 states [2019-10-14 23:15:34,942 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:34,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2019-10-14 23:15:34,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=2599, Unknown=0, NotChecked=0, Total=3192 [2019-10-14 23:15:34,943 INFO L87 Difference]: Start difference. First operand 1033 states and 1185 transitions. Second operand 57 states. [2019-10-14 23:15:36,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:15:36,325 INFO L93 Difference]: Finished difference Result 2373 states and 2707 transitions. [2019-10-14 23:15:36,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-10-14 23:15:36,325 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 140 [2019-10-14 23:15:36,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:15:36,332 INFO L225 Difference]: With dead ends: 2373 [2019-10-14 23:15:36,333 INFO L226 Difference]: Without dead ends: 1500 [2019-10-14 23:15:36,335 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2251 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1618, Invalid=6754, Unknown=0, NotChecked=0, Total=8372 [2019-10-14 23:15:36,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1500 states. [2019-10-14 23:15:36,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1500 to 1042. [2019-10-14 23:15:36,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1042 states. [2019-10-14 23:15:36,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1042 states to 1042 states and 1193 transitions. [2019-10-14 23:15:36,409 INFO L78 Accepts]: Start accepts. Automaton has 1042 states and 1193 transitions. Word has length 140 [2019-10-14 23:15:36,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:15:36,409 INFO L462 AbstractCegarLoop]: Abstraction has 1042 states and 1193 transitions. [2019-10-14 23:15:36,409 INFO L463 AbstractCegarLoop]: Interpolant automaton has 57 states. [2019-10-14 23:15:36,410 INFO L276 IsEmpty]: Start isEmpty. Operand 1042 states and 1193 transitions. [2019-10-14 23:15:36,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2019-10-14 23:15:36,413 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:15:36,414 INFO L380 BasicCegarLoop]: trace histogram [39, 39, 36, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:15:36,617 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:36,617 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:15:36,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:15:36,618 INFO L82 PathProgramCache]: Analyzing trace with hash -1059604552, now seen corresponding path program 5 times [2019-10-14 23:15:36,618 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:15:36,618 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95817656] [2019-10-14 23:15:36,618 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:36,618 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:15:36,618 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:15:36,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:37,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:37,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:37,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:15:37,388 INFO L134 CoverageAnalysis]: Checked inductivity of 2363 backedges. 43 proven. 2316 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 23:15:37,388 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95817656] [2019-10-14 23:15:37,389 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746277227] [2019-10-14 23:15:37,389 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:15:37,513 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2019-10-14 23:15:37,513 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:15:37,515 INFO L256 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-14 23:15:37,516 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:15:37,912 INFO L134 CoverageAnalysis]: Checked inductivity of 2363 backedges. 1160 proven. 222 refuted. 0 times theorem prover too weak. 981 trivial. 0 not checked. [2019-10-14 23:15:37,912 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:15:37,912 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 18] total 64 [2019-10-14 23:15:37,912 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783242546] [2019-10-14 23:15:37,913 INFO L442 AbstractCegarLoop]: Interpolant automaton has 64 states [2019-10-14 23:15:37,913 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:15:37,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2019-10-14 23:15:37,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=520, Invalid=3512, Unknown=0, NotChecked=0, Total=4032 [2019-10-14 23:15:37,914 INFO L87 Difference]: Start difference. First operand 1042 states and 1193 transitions. Second operand 64 states.