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/array-crafted/zero_sum_const1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 17:42:13,789 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 17:42:13,792 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 17:42:13,809 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 17:42:13,809 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 17:42:13,810 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 17:42:13,812 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 17:42:13,822 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 17:42:13,826 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 17:42:13,829 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 17:42:13,831 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 17:42:13,832 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 17:42:13,833 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 17:42:13,833 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 17:42:13,834 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 17:42:13,835 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 17:42:13,836 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 17:42:13,837 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 17:42:13,838 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 17:42:13,839 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 17:42:13,841 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 17:42:13,841 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 17:42:13,842 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 17:42:13,843 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 17:42:13,845 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-13 17:42:13,845 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-13 17:42:13,846 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-13 17:42:13,846 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-13 17:42:13,847 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-13 17:42:13,848 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-13 17:42:13,848 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 17:42:13,849 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 17:42:13,849 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 17:42:13,850 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 17:42:13,851 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 17:42:13,851 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 17:42:13,852 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 17:42:13,852 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 17:42:13,852 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 17:42:13,853 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 17:42:13,854 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 17:42:13,854 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 [2019-10-13 17:42:13,868 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 17:42:13,868 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 17:42:13,870 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 17:42:13,870 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 17:42:13,870 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 17:42:13,870 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 17:42:13,874 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 17:42:13,874 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 17:42:13,875 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 17:42:13,875 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 17:42:13,875 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 17:42:13,875 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 17:42:13,875 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 17:42:13,876 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 17:42:13,876 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 17:42:13,876 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 17:42:13,876 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 17:42:13,876 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 17:42:13,877 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 17:42:13,877 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 17:42:13,877 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 17:42:13,877 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 17:42:13,877 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 17:42:13,878 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 17:42:13,878 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 17:42:13,878 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 17:42:13,878 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 17:42:13,878 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 17:42:13,878 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-13 17:42:14,159 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 17:42:14,173 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 17:42:14,176 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 17:42:14,178 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 17:42:14,178 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 17:42:14,179 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum_const1.c [2019-10-13 17:42:14,243 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/829f6c4d5/960a8e13914f4c308b7dfa475b70c80b/FLAGdbe198ddf [2019-10-13 17:42:14,703 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 17:42:14,705 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum_const1.c [2019-10-13 17:42:14,712 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/829f6c4d5/960a8e13914f4c308b7dfa475b70c80b/FLAGdbe198ddf [2019-10-13 17:42:15,085 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/829f6c4d5/960a8e13914f4c308b7dfa475b70c80b [2019-10-13 17:42:15,095 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 17:42:15,097 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 17:42:15,098 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 17:42:15,098 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 17:42:15,102 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 17:42:15,103 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:42:15" (1/1) ... [2019-10-13 17:42:15,105 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@15161af2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:42:15, skipping insertion in model container [2019-10-13 17:42:15,106 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:42:15" (1/1) ... [2019-10-13 17:42:15,113 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 17:42:15,131 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 17:42:15,306 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:42:15,317 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 17:42:15,336 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:42:15,352 INFO L192 MainTranslator]: Completed translation [2019-10-13 17:42:15,353 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:42:15 WrapperNode [2019-10-13 17:42:15,353 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 17:42:15,353 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 17:42:15,354 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 17:42:15,354 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 17:42:15,452 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:42:15" (1/1) ... [2019-10-13 17:42:15,452 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:42:15" (1/1) ... [2019-10-13 17:42:15,461 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:42:15" (1/1) ... [2019-10-13 17:42:15,462 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:42:15" (1/1) ... [2019-10-13 17:42:15,486 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:42:15" (1/1) ... [2019-10-13 17:42:15,492 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:42:15" (1/1) ... [2019-10-13 17:42:15,499 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:42:15" (1/1) ... [2019-10-13 17:42:15,504 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 17:42:15,504 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 17:42:15,505 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 17:42:15,505 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 17:42:15,506 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:42:15" (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 [2019-10-13 17:42:15,569 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 17:42:15,569 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 17:42:15,569 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-13 17:42:15,569 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 17:42:15,570 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 17:42:15,570 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-13 17:42:15,570 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-13 17:42:15,570 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_long [2019-10-13 17:42:15,570 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-10-13 17:42:15,570 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 17:42:15,570 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-10-13 17:42:15,571 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-13 17:42:15,571 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-13 17:42:15,571 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 17:42:15,571 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 17:42:15,571 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-13 17:42:15,822 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 17:42:15,822 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-13 17:42:15,823 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:42:15 BoogieIcfgContainer [2019-10-13 17:42:15,823 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 17:42:15,824 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 17:42:15,825 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 17:42:15,828 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 17:42:15,828 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 05:42:15" (1/3) ... [2019-10-13 17:42:15,829 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ad1c930 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:42:15, skipping insertion in model container [2019-10-13 17:42:15,829 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:42:15" (2/3) ... [2019-10-13 17:42:15,829 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ad1c930 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:42:15, skipping insertion in model container [2019-10-13 17:42:15,830 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:42:15" (3/3) ... [2019-10-13 17:42:15,831 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum_const1.c [2019-10-13 17:42:15,851 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 17:42:15,866 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 17:42:15,885 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 17:42:15,910 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 17:42:15,911 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 17:42:15,911 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 17:42:15,914 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 17:42:15,914 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 17:42:15,914 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 17:42:15,915 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 17:42:15,915 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 17:42:15,935 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-10-13 17:42:15,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-13 17:42:15,941 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:15,942 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:15,944 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:15,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:15,949 INFO L82 PathProgramCache]: Analyzing trace with hash -39751432, now seen corresponding path program 1 times [2019-10-13 17:42:15,957 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:15,957 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856794917] [2019-10-13 17:42:15,958 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:15,958 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:15,958 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:16,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:16,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:16,156 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:42:16,157 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856794917] [2019-10-13 17:42:16,158 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:42:16,159 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-13 17:42:16,159 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882984795] [2019-10-13 17:42:16,163 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 17:42:16,164 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:16,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 17:42:16,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 17:42:16,182 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-10-13 17:42:16,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:16,306 INFO L93 Difference]: Finished difference Result 45 states and 57 transitions. [2019-10-13 17:42:16,307 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 17:42:16,308 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-10-13 17:42:16,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:16,320 INFO L225 Difference]: With dead ends: 45 [2019-10-13 17:42:16,320 INFO L226 Difference]: Without dead ends: 20 [2019-10-13 17:42:16,323 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 17:42:16,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-13 17:42:16,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-13 17:42:16,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-13 17:42:16,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-10-13 17:42:16,359 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 16 [2019-10-13 17:42:16,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:16,360 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-10-13 17:42:16,360 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 17:42:16,361 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-10-13 17:42:16,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-13 17:42:16,362 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:16,362 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:16,362 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:16,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:16,363 INFO L82 PathProgramCache]: Analyzing trace with hash 1179444838, now seen corresponding path program 1 times [2019-10-13 17:42:16,363 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:16,364 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681762727] [2019-10-13 17:42:16,364 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:16,364 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:16,365 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:16,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:16,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:16,534 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:42:16,534 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681762727] [2019-10-13 17:42:16,535 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:42:16,535 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-13 17:42:16,535 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116062336] [2019-10-13 17:42:16,537 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 17:42:16,537 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:16,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 17:42:16,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:42:16,540 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2019-10-13 17:42:16,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:16,669 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2019-10-13 17:42:16,670 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-13 17:42:16,670 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2019-10-13 17:42:16,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:16,671 INFO L225 Difference]: With dead ends: 28 [2019-10-13 17:42:16,672 INFO L226 Difference]: Without dead ends: 23 [2019-10-13 17:42:16,673 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:42:16,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-10-13 17:42:16,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-10-13 17:42:16,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-13 17:42:16,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2019-10-13 17:42:16,680 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 16 [2019-10-13 17:42:16,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:16,681 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2019-10-13 17:42:16,681 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 17:42:16,681 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2019-10-13 17:42:16,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-13 17:42:16,682 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:16,682 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:16,683 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:16,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:16,683 INFO L82 PathProgramCache]: Analyzing trace with hash 621827044, now seen corresponding path program 1 times [2019-10-13 17:42:16,684 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:16,684 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1729490030] [2019-10-13 17:42:16,684 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:16,684 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:16,684 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:16,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:16,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:16,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:42:16,777 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1729490030] [2019-10-13 17:42:16,777 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:42:16,777 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:42:16,777 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093017687] [2019-10-13 17:42:16,778 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:42:16,778 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:16,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:42:16,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:42:16,779 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 4 states. [2019-10-13 17:42:16,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:16,846 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2019-10-13 17:42:16,846 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:42:16,846 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-10-13 17:42:16,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:16,847 INFO L225 Difference]: With dead ends: 39 [2019-10-13 17:42:16,848 INFO L226 Difference]: Without dead ends: 25 [2019-10-13 17:42:16,848 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 [2019-10-13 17:42:16,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-13 17:42:16,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2019-10-13 17:42:16,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-13 17:42:16,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2019-10-13 17:42:16,855 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 18 [2019-10-13 17:42:16,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:16,856 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2019-10-13 17:42:16,856 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:42:16,856 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2019-10-13 17:42:16,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-13 17:42:16,857 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:16,857 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:16,858 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:16,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:16,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1263872610, now seen corresponding path program 1 times [2019-10-13 17:42:16,859 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:16,859 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [173205432] [2019-10-13 17:42:16,859 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:16,859 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:16,860 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:16,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:16,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:16,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-13 17:42:16,976 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [173205432] [2019-10-13 17:42:16,976 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:42:16,976 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-13 17:42:16,977 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501695485] [2019-10-13 17:42:16,977 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-13 17:42:16,979 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:16,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-13 17:42:16,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-13 17:42:16,980 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 5 states. [2019-10-13 17:42:17,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:17,124 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2019-10-13 17:42:17,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-13 17:42:17,125 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2019-10-13 17:42:17,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:17,125 INFO L225 Difference]: With dead ends: 35 [2019-10-13 17:42:17,126 INFO L226 Difference]: Without dead ends: 26 [2019-10-13 17:42:17,126 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:42:17,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-13 17:42:17,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2019-10-13 17:42:17,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-13 17:42:17,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2019-10-13 17:42:17,133 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 20 [2019-10-13 17:42:17,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:17,133 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2019-10-13 17:42:17,133 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-13 17:42:17,133 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2019-10-13 17:42:17,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-13 17:42:17,134 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:17,134 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:17,135 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:17,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:17,135 INFO L82 PathProgramCache]: Analyzing trace with hash 245922080, now seen corresponding path program 1 times [2019-10-13 17:42:17,135 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:17,136 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55599304] [2019-10-13 17:42:17,136 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:17,136 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:17,136 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:17,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:17,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:17,201 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-13 17:42:17,201 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55599304] [2019-10-13 17:42:17,202 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1491412888] [2019-10-13 17:42:17,202 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 [2019-10-13 17:42:17,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:17,253 INFO L256 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 17:42:17,259 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:42:17,303 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-13 17:42:17,303 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:42:17,303 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2019-10-13 17:42:17,304 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279778457] [2019-10-13 17:42:17,304 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-13 17:42:17,304 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:17,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-13 17:42:17,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:42:17,305 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 7 states. [2019-10-13 17:42:17,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:17,374 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2019-10-13 17:42:17,374 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-13 17:42:17,375 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2019-10-13 17:42:17,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:17,375 INFO L225 Difference]: With dead ends: 39 [2019-10-13 17:42:17,375 INFO L226 Difference]: Without dead ends: 26 [2019-10-13 17:42:17,376 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:42:17,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-13 17:42:17,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2019-10-13 17:42:17,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-10-13 17:42:17,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2019-10-13 17:42:17,382 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 22 [2019-10-13 17:42:17,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:17,382 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2019-10-13 17:42:17,382 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-13 17:42:17,382 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2019-10-13 17:42:17,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-10-13 17:42:17,383 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:17,383 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:17,588 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:17,589 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:17,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:17,590 INFO L82 PathProgramCache]: Analyzing trace with hash 1099030686, now seen corresponding path program 2 times [2019-10-13 17:42:17,590 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:17,591 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014630083] [2019-10-13 17:42:17,591 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:17,591 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:17,591 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:17,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:17,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:17,669 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-13 17:42:17,669 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014630083] [2019-10-13 17:42:17,669 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [967195592] [2019-10-13 17:42:17,669 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:17,711 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:42:17,711 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:42:17,712 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 17:42:17,714 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:42:17,750 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-13 17:42:17,750 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:42:17,751 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 8 [2019-10-13 17:42:17,752 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432743653] [2019-10-13 17:42:17,753 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-13 17:42:17,753 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:17,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-13 17:42:17,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:42:17,754 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 8 states. [2019-10-13 17:42:17,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:17,885 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2019-10-13 17:42:17,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-13 17:42:17,885 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2019-10-13 17:42:17,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:17,886 INFO L225 Difference]: With dead ends: 41 [2019-10-13 17:42:17,886 INFO L226 Difference]: Without dead ends: 32 [2019-10-13 17:42:17,887 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2019-10-13 17:42:17,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-10-13 17:42:17,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2019-10-13 17:42:17,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-13 17:42:17,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-10-13 17:42:17,896 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 24 [2019-10-13 17:42:17,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:17,896 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-10-13 17:42:17,897 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-13 17:42:17,897 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-10-13 17:42:17,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-13 17:42:17,898 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:17,898 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:18,099 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:18,100 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:18,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:18,100 INFO L82 PathProgramCache]: Analyzing trace with hash 1291933786, now seen corresponding path program 3 times [2019-10-13 17:42:18,101 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:18,101 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297502442] [2019-10-13 17:42:18,101 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:18,101 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:18,101 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:18,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:18,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:18,811 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:42:18,811 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297502442] [2019-10-13 17:42:18,812 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211574099] [2019-10-13 17:42:18,812 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:18,871 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-13 17:42:18,872 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:42:18,873 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 35 conjunts are in the unsatisfiable core [2019-10-13 17:42:18,878 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:42:19,490 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:42:19,491 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 18 [2019-10-13 17:42:19,493 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2019-10-13 17:42:19,505 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:42:19,506 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:19,511 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-10-13 17:42:19,511 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:32, output treesize:31 [2019-10-13 17:42:19,595 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:19,668 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:19,695 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:19,764 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:42:19,764 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:42:19,765 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 20] total 35 [2019-10-13 17:42:19,765 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108006437] [2019-10-13 17:42:19,765 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-13 17:42:19,766 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:19,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-13 17:42:19,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1080, Unknown=0, NotChecked=0, Total=1190 [2019-10-13 17:42:19,767 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 35 states. [2019-10-13 17:42:21,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:21,132 INFO L93 Difference]: Finished difference Result 60 states and 66 transitions. [2019-10-13 17:42:21,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-13 17:42:21,133 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 28 [2019-10-13 17:42:21,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:21,134 INFO L225 Difference]: With dead ends: 60 [2019-10-13 17:42:21,135 INFO L226 Difference]: Without dead ends: 54 [2019-10-13 17:42:21,137 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=236, Invalid=2314, Unknown=0, NotChecked=0, Total=2550 [2019-10-13 17:42:21,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-13 17:42:21,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 34. [2019-10-13 17:42:21,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-13 17:42:21,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2019-10-13 17:42:21,154 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 28 [2019-10-13 17:42:21,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:21,155 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2019-10-13 17:42:21,156 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-13 17:42:21,156 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2019-10-13 17:42:21,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-13 17:42:21,158 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:21,158 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:21,361 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:21,362 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:21,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:21,363 INFO L82 PathProgramCache]: Analyzing trace with hash 1349523672, now seen corresponding path program 4 times [2019-10-13 17:42:21,364 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:21,364 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583948195] [2019-10-13 17:42:21,365 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:21,365 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:21,366 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:21,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:21,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:21,462 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-13 17:42:21,462 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583948195] [2019-10-13 17:42:21,462 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107636719] [2019-10-13 17:42:21,463 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:21,517 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:42:21,518 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:42:21,520 INFO L256 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 17:42:21,527 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:42:21,608 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-13 17:42:21,609 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:42:21,609 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 14 [2019-10-13 17:42:21,609 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133653863] [2019-10-13 17:42:21,610 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-13 17:42:21,610 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:21,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-13 17:42:21,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:42:21,611 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand 14 states. [2019-10-13 17:42:21,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:21,839 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2019-10-13 17:42:21,839 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-13 17:42:21,839 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 30 [2019-10-13 17:42:21,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:21,840 INFO L225 Difference]: With dead ends: 69 [2019-10-13 17:42:21,841 INFO L226 Difference]: Without dead ends: 43 [2019-10-13 17:42:21,842 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=231, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:42:21,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-13 17:42:21,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 33. [2019-10-13 17:42:21,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-13 17:42:21,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2019-10-13 17:42:21,849 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 30 [2019-10-13 17:42:21,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:21,849 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2019-10-13 17:42:21,849 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-13 17:42:21,849 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2019-10-13 17:42:21,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-13 17:42:21,851 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:21,851 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:22,055 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:22,056 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:22,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:22,056 INFO L82 PathProgramCache]: Analyzing trace with hash 28770966, now seen corresponding path program 5 times [2019-10-13 17:42:22,057 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:22,058 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582500825] [2019-10-13 17:42:22,058 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:22,058 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:22,058 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:22,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:22,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:22,189 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-13 17:42:22,190 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582500825] [2019-10-13 17:42:22,190 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1030725344] [2019-10-13 17:42:22,191 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:22,242 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-10-13 17:42:22,242 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:42:22,243 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 17:42:22,245 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:42:22,326 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-13 17:42:22,327 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:42:22,327 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 14 [2019-10-13 17:42:22,327 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811145539] [2019-10-13 17:42:22,328 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-13 17:42:22,328 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:22,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-13 17:42:22,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:42:22,329 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 14 states. [2019-10-13 17:42:22,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:22,555 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2019-10-13 17:42:22,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-13 17:42:22,556 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2019-10-13 17:42:22,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:22,557 INFO L225 Difference]: With dead ends: 42 [2019-10-13 17:42:22,557 INFO L226 Difference]: Without dead ends: 37 [2019-10-13 17:42:22,559 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=101, Invalid=319, Unknown=0, NotChecked=0, Total=420 [2019-10-13 17:42:22,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-13 17:42:22,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2019-10-13 17:42:22,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-10-13 17:42:22,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2019-10-13 17:42:22,565 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 32 [2019-10-13 17:42:22,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:22,566 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2019-10-13 17:42:22,566 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-13 17:42:22,566 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2019-10-13 17:42:22,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-13 17:42:22,567 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:22,567 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:22,778 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:22,779 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:22,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:22,780 INFO L82 PathProgramCache]: Analyzing trace with hash -1369168876, now seen corresponding path program 6 times [2019-10-13 17:42:22,780 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:22,781 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295645258] [2019-10-13 17:42:22,781 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:22,781 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:22,782 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:22,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:24,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:24,323 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:42:24,324 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295645258] [2019-10-13 17:42:24,324 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610920710] [2019-10-13 17:42:24,324 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:24,386 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-10-13 17:42:24,386 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:42:24,388 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 44 conjunts are in the unsatisfiable core [2019-10-13 17:42:24,390 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:42:25,011 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:25,082 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:42:25,082 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:42:25,082 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 21] total 44 [2019-10-13 17:42:25,082 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731981643] [2019-10-13 17:42:25,083 INFO L442 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-10-13 17:42:25,083 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:25,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-10-13 17:42:25,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1704, Unknown=0, NotChecked=0, Total=1892 [2019-10-13 17:42:25,085 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 44 states. [2019-10-13 17:42:28,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:28,947 INFO L93 Difference]: Finished difference Result 70 states and 76 transitions. [2019-10-13 17:42:28,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-10-13 17:42:28,948 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 34 [2019-10-13 17:42:28,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:28,952 INFO L225 Difference]: With dead ends: 70 [2019-10-13 17:42:28,952 INFO L226 Difference]: Without dead ends: 64 [2019-10-13 17:42:28,955 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1837 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=721, Invalid=5921, Unknown=0, NotChecked=0, Total=6642 [2019-10-13 17:42:28,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-13 17:42:28,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 40. [2019-10-13 17:42:28,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-13 17:42:28,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2019-10-13 17:42:28,963 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 34 [2019-10-13 17:42:28,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:28,963 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2019-10-13 17:42:28,963 INFO L463 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-10-13 17:42:28,963 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2019-10-13 17:42:28,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-10-13 17:42:28,964 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:28,964 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:29,168 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:29,172 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:29,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:29,173 INFO L82 PathProgramCache]: Analyzing trace with hash -464593390, now seen corresponding path program 7 times [2019-10-13 17:42:29,173 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:29,174 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1861586558] [2019-10-13 17:42:29,174 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:29,174 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:29,174 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:29,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:29,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:29,291 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-13 17:42:29,291 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1861586558] [2019-10-13 17:42:29,291 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1633434868] [2019-10-13 17:42:29,291 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:29,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:29,363 INFO L256 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-13 17:42:29,365 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:42:29,487 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-13 17:42:29,488 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:42:29,488 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 17 [2019-10-13 17:42:29,488 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331153404] [2019-10-13 17:42:29,489 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-13 17:42:29,489 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:29,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-13 17:42:29,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2019-10-13 17:42:29,490 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 17 states. [2019-10-13 17:42:29,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:29,730 INFO L93 Difference]: Finished difference Result 81 states and 87 transitions. [2019-10-13 17:42:29,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-13 17:42:29,730 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2019-10-13 17:42:29,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:29,731 INFO L225 Difference]: With dead ends: 81 [2019-10-13 17:42:29,731 INFO L226 Difference]: Without dead ends: 49 [2019-10-13 17:42:29,732 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=353, Unknown=0, NotChecked=0, Total=462 [2019-10-13 17:42:29,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-13 17:42:29,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 39. [2019-10-13 17:42:29,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-10-13 17:42:29,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2019-10-13 17:42:29,739 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 36 [2019-10-13 17:42:29,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:29,740 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2019-10-13 17:42:29,740 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-13 17:42:29,740 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2019-10-13 17:42:29,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-13 17:42:29,741 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:29,741 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:29,948 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:29,949 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:29,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:29,949 INFO L82 PathProgramCache]: Analyzing trace with hash 541401424, now seen corresponding path program 8 times [2019-10-13 17:42:29,949 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:29,949 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807545231] [2019-10-13 17:42:29,949 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:29,949 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:29,950 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:29,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:30,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:30,059 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 17:42:30,059 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807545231] [2019-10-13 17:42:30,059 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1073935921] [2019-10-13 17:42:30,059 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:30,142 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:42:30,143 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:42:30,144 INFO L256 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-13 17:42:30,161 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:42:30,267 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 17:42:30,268 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:42:30,268 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 17 [2019-10-13 17:42:30,268 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430772402] [2019-10-13 17:42:30,268 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-13 17:42:30,269 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:30,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-13 17:42:30,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2019-10-13 17:42:30,269 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 17 states. [2019-10-13 17:42:30,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:30,521 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2019-10-13 17:42:30,522 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-13 17:42:30,522 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2019-10-13 17:42:30,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:30,523 INFO L225 Difference]: With dead ends: 48 [2019-10-13 17:42:30,523 INFO L226 Difference]: Without dead ends: 43 [2019-10-13 17:42:30,524 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=148, Invalid=502, Unknown=0, NotChecked=0, Total=650 [2019-10-13 17:42:30,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-13 17:42:30,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2019-10-13 17:42:30,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-10-13 17:42:30,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2019-10-13 17:42:30,531 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 38 [2019-10-13 17:42:30,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:30,532 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2019-10-13 17:42:30,532 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-13 17:42:30,532 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2019-10-13 17:42:30,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-10-13 17:42:30,533 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:30,533 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:30,743 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:30,744 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:30,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:30,744 INFO L82 PathProgramCache]: Analyzing trace with hash 1642429518, now seen corresponding path program 9 times [2019-10-13 17:42:30,744 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:30,745 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607680216] [2019-10-13 17:42:30,745 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:30,745 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:30,745 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:30,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:31,467 WARN L191 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 39 [2019-10-13 17:42:31,695 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 35 [2019-10-13 17:42:31,857 WARN L191 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 39 [2019-10-13 17:42:32,008 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2019-10-13 17:42:32,163 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 44 [2019-10-13 17:42:33,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:33,954 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 4 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:42:33,954 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607680216] [2019-10-13 17:42:33,955 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [635008123] [2019-10-13 17:42:33,955 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:34,022 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-10-13 17:42:34,023 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:42:34,024 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 52 conjunts are in the unsatisfiable core [2019-10-13 17:42:34,030 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:42:34,089 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2019-10-13 17:42:34,090 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-13 17:42:34,099 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:42:34,099 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:42:34,100 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:21 [2019-10-13 17:42:35,495 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-13 17:42:35,511 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-13 17:42:35,513 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-13 17:42:35,514 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-13 17:42:35,516 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-13 17:42:35,533 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:42:35,533 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 46 treesize of output 69 [2019-10-13 17:42:35,535 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:35,535 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:35,536 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:35,537 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:35,537 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:35,538 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 4 xjuncts. [2019-10-13 17:42:35,579 INFO L567 ElimStorePlain]: treesize reduction 97, result has 26.5 percent of original size [2019-10-13 17:42:35,580 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:35,581 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:42:35,582 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:65, output treesize:19 [2019-10-13 17:42:35,655 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:35,732 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:35,775 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:35,923 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 7 proven. 32 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-13 17:42:35,924 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:42:35,924 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 26] total 57 [2019-10-13 17:42:35,924 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103240373] [2019-10-13 17:42:35,925 INFO L442 AbstractCegarLoop]: Interpolant automaton has 57 states [2019-10-13 17:42:35,925 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:35,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2019-10-13 17:42:35,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=2918, Unknown=0, NotChecked=0, Total=3192 [2019-10-13 17:42:35,927 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 57 states. [2019-10-13 17:42:37,672 WARN L191 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 68 [2019-10-13 17:42:38,386 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 47 [2019-10-13 17:42:38,594 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 48 [2019-10-13 17:42:38,819 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 57 [2019-10-13 17:42:39,594 WARN L191 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 87 [2019-10-13 17:42:40,271 WARN L191 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 58 [2019-10-13 17:42:40,555 WARN L191 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 59 [2019-10-13 17:42:40,802 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 50 [2019-10-13 17:42:41,066 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 51 [2019-10-13 17:42:41,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:41,757 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2019-10-13 17:42:41,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-10-13 17:42:41,758 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 40 [2019-10-13 17:42:41,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:41,759 INFO L225 Difference]: With dead ends: 59 [2019-10-13 17:42:41,759 INFO L226 Difference]: Without dead ends: 54 [2019-10-13 17:42:41,762 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2054 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=806, Invalid=7026, Unknown=0, NotChecked=0, Total=7832 [2019-10-13 17:42:41,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-13 17:42:41,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2019-10-13 17:42:41,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-13 17:42:41,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2019-10-13 17:42:41,770 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 40 [2019-10-13 17:42:41,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:41,770 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2019-10-13 17:42:41,770 INFO L463 AbstractCegarLoop]: Interpolant automaton has 57 states. [2019-10-13 17:42:41,771 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2019-10-13 17:42:41,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-13 17:42:41,771 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:41,772 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:41,975 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:41,976 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:41,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:41,976 INFO L82 PathProgramCache]: Analyzing trace with hash -1126494260, now seen corresponding path program 10 times [2019-10-13 17:42:41,977 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:41,977 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306859271] [2019-10-13 17:42:41,977 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:41,977 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:41,978 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:41,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:42,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:42,084 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 18 proven. 23 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 17:42:42,085 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306859271] [2019-10-13 17:42:42,085 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [558175822] [2019-10-13 17:42:42,085 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:42,140 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:42:42,140 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:42:42,141 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-13 17:42:42,143 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:42:42,243 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 17:42:42,243 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:42:42,243 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 20 [2019-10-13 17:42:42,244 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174597508] [2019-10-13 17:42:42,244 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-13 17:42:42,244 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:42,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-13 17:42:42,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2019-10-13 17:42:42,245 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 20 states. [2019-10-13 17:42:42,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:42,527 INFO L93 Difference]: Finished difference Result 93 states and 99 transitions. [2019-10-13 17:42:42,527 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-13 17:42:42,527 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2019-10-13 17:42:42,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:42,528 INFO L225 Difference]: With dead ends: 93 [2019-10-13 17:42:42,528 INFO L226 Difference]: Without dead ends: 55 [2019-10-13 17:42:42,529 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=150, Invalid=500, Unknown=0, NotChecked=0, Total=650 [2019-10-13 17:42:42,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-10-13 17:42:42,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 45. [2019-10-13 17:42:42,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-10-13 17:42:42,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2019-10-13 17:42:42,538 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 42 [2019-10-13 17:42:42,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:42,538 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2019-10-13 17:42:42,538 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-13 17:42:42,539 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2019-10-13 17:42:42,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-13 17:42:42,540 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:42,540 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:42,743 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:42,744 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:42,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:42,745 INFO L82 PathProgramCache]: Analyzing trace with hash 1911524490, now seen corresponding path program 11 times [2019-10-13 17:42:42,745 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:42,746 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687793163] [2019-10-13 17:42:42,746 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:42,746 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:42,746 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:42,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:42,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:42,884 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 9 proven. 32 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-13 17:42:42,885 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687793163] [2019-10-13 17:42:42,885 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [690750912] [2019-10-13 17:42:42,885 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:42,958 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-13 17:42:42,958 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:42:42,959 INFO L256 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-13 17:42:42,960 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:42:43,049 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 16 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-13 17:42:43,050 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:42:43,050 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 20 [2019-10-13 17:42:43,050 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495238334] [2019-10-13 17:42:43,051 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-13 17:42:43,051 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:43,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-13 17:42:43,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2019-10-13 17:42:43,051 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 20 states. [2019-10-13 17:42:43,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:43,436 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2019-10-13 17:42:43,436 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-13 17:42:43,436 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2019-10-13 17:42:43,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:43,437 INFO L225 Difference]: With dead ends: 54 [2019-10-13 17:42:43,437 INFO L226 Difference]: Without dead ends: 49 [2019-10-13 17:42:43,439 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=205, Invalid=725, Unknown=0, NotChecked=0, Total=930 [2019-10-13 17:42:43,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-13 17:42:43,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2019-10-13 17:42:43,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-10-13 17:42:43,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2019-10-13 17:42:43,447 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 44 [2019-10-13 17:42:43,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:43,447 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2019-10-13 17:42:43,448 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-13 17:42:43,448 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2019-10-13 17:42:43,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-10-13 17:42:43,448 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:43,448 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:43,664 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:43,665 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:43,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:43,665 INFO L82 PathProgramCache]: Analyzing trace with hash -224263928, now seen corresponding path program 12 times [2019-10-13 17:42:43,665 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:43,665 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324331240] [2019-10-13 17:42:43,665 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:43,665 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:43,665 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:43,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:44,789 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 46 [2019-10-13 17:42:44,960 WARN L191 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 46 [2019-10-13 17:42:46,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:46,237 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 12 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:42:46,238 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324331240] [2019-10-13 17:42:46,238 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344748560] [2019-10-13 17:42:46,238 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:46,309 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2019-10-13 17:42:46,309 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:42:46,311 INFO L256 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 58 conjunts are in the unsatisfiable core [2019-10-13 17:42:46,313 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:42:46,360 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2019-10-13 17:42:46,361 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-13 17:42:46,369 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:42:46,370 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:42:46,370 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:21 [2019-10-13 17:42:48,142 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-13 17:42:48,153 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:42:48,154 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 27 treesize of output 36 [2019-10-13 17:42:48,155 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-13 17:42:48,186 INFO L567 ElimStorePlain]: treesize reduction 16, result has 69.2 percent of original size [2019-10-13 17:42:48,187 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:48,188 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:42:48,188 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:46, output treesize:20 [2019-10-13 17:42:48,279 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:48,376 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:48,397 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:42:48,519 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 9 proven. 50 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 17:42:48,519 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:42:48,519 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 30] total 63 [2019-10-13 17:42:48,520 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424660385] [2019-10-13 17:42:48,520 INFO L442 AbstractCegarLoop]: Interpolant automaton has 63 states [2019-10-13 17:42:48,520 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:48,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2019-10-13 17:42:48,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=3510, Unknown=0, NotChecked=0, Total=3906 [2019-10-13 17:42:48,522 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 63 states. [2019-10-13 17:42:53,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:53,970 INFO L93 Difference]: Finished difference Result 67 states and 70 transitions. [2019-10-13 17:42:53,970 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-10-13 17:42:53,971 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 46 [2019-10-13 17:42:53,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:53,972 INFO L225 Difference]: With dead ends: 67 [2019-10-13 17:42:53,972 INFO L226 Difference]: Without dead ends: 62 [2019-10-13 17:42:53,975 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2587 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=990, Invalid=8910, Unknown=0, NotChecked=0, Total=9900 [2019-10-13 17:42:53,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-10-13 17:42:53,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 52. [2019-10-13 17:42:53,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-13 17:42:53,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2019-10-13 17:42:53,984 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 46 [2019-10-13 17:42:53,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:53,984 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2019-10-13 17:42:53,985 INFO L463 AbstractCegarLoop]: Interpolant automaton has 63 states. [2019-10-13 17:42:53,985 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2019-10-13 17:42:53,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-10-13 17:42:53,985 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:53,986 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:54,189 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:54,190 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:54,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:54,190 INFO L82 PathProgramCache]: Analyzing trace with hash 277433862, now seen corresponding path program 13 times [2019-10-13 17:42:54,190 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:54,191 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966461928] [2019-10-13 17:42:54,191 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:54,191 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:54,191 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:54,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:54,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:54,323 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 27 proven. 34 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-13 17:42:54,323 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1966461928] [2019-10-13 17:42:54,323 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129776514] [2019-10-13 17:42:54,323 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:54,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:54,391 INFO L256 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-13 17:42:54,392 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:42:54,506 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-13 17:42:54,506 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:42:54,506 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 23 [2019-10-13 17:42:54,507 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831771592] [2019-10-13 17:42:54,507 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-13 17:42:54,507 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:54,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-13 17:42:54,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=387, Unknown=0, NotChecked=0, Total=506 [2019-10-13 17:42:54,508 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 23 states. [2019-10-13 17:42:54,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:54,886 INFO L93 Difference]: Finished difference Result 105 states and 111 transitions. [2019-10-13 17:42:54,887 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-13 17:42:54,887 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 48 [2019-10-13 17:42:54,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:54,888 INFO L225 Difference]: With dead ends: 105 [2019-10-13 17:42:54,888 INFO L226 Difference]: Without dead ends: 61 [2019-10-13 17:42:54,889 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=198, Invalid=672, Unknown=0, NotChecked=0, Total=870 [2019-10-13 17:42:54,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-10-13 17:42:54,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 51. [2019-10-13 17:42:54,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-10-13 17:42:54,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2019-10-13 17:42:54,896 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 48 [2019-10-13 17:42:54,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:54,897 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2019-10-13 17:42:54,897 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-13 17:42:54,897 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2019-10-13 17:42:54,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-10-13 17:42:54,897 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:54,897 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:55,098 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:55,098 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:55,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:55,099 INFO L82 PathProgramCache]: Analyzing trace with hash 2021844036, now seen corresponding path program 14 times [2019-10-13 17:42:55,099 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:55,099 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924323167] [2019-10-13 17:42:55,100 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:55,100 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:55,100 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:55,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:55,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:55,246 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 17:42:55,247 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924323167] [2019-10-13 17:42:55,247 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [744813344] [2019-10-13 17:42:55,247 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:55,318 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:42:55,318 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:42:55,319 INFO L256 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-13 17:42:55,320 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:42:55,458 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 25 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 17:42:55,458 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:42:55,459 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 23 [2019-10-13 17:42:55,459 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54091410] [2019-10-13 17:42:55,459 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-13 17:42:55,459 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:42:55,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-13 17:42:55,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=382, Unknown=0, NotChecked=0, Total=506 [2019-10-13 17:42:55,460 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 23 states. [2019-10-13 17:42:55,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:42:55,912 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2019-10-13 17:42:55,912 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-13 17:42:55,913 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2019-10-13 17:42:55,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:42:55,914 INFO L225 Difference]: With dead ends: 60 [2019-10-13 17:42:55,914 INFO L226 Difference]: Without dead ends: 55 [2019-10-13 17:42:55,915 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=272, Invalid=988, Unknown=0, NotChecked=0, Total=1260 [2019-10-13 17:42:55,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-10-13 17:42:55,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 53. [2019-10-13 17:42:55,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-10-13 17:42:55,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2019-10-13 17:42:55,924 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 50 [2019-10-13 17:42:55,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:42:55,924 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2019-10-13 17:42:55,924 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-13 17:42:55,924 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2019-10-13 17:42:55,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-10-13 17:42:55,925 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:42:55,925 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:42:56,125 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:42:56,126 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:42:56,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:42:56,126 INFO L82 PathProgramCache]: Analyzing trace with hash -1581362622, now seen corresponding path program 15 times [2019-10-13 17:42:56,127 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:42:56,127 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [658539448] [2019-10-13 17:42:56,127 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:56,127 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:42:56,128 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:42:56,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:42:57,525 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 45 [2019-10-13 17:42:57,685 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 48 [2019-10-13 17:42:57,840 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 51 [2019-10-13 17:42:57,999 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 51 [2019-10-13 17:42:58,167 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 50 [2019-10-13 17:42:58,348 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 51 [2019-10-13 17:42:59,141 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 55