/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o1000.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:38:17,852 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:38:17,856 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:38:17,874 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:38:17,875 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:38:17,876 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:38:17,877 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:38:17,880 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:38:17,882 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:38:17,883 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:38:17,884 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:38:17,885 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:38:17,886 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:38:17,887 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:38:17,888 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:38:17,890 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:38:17,891 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:38:17,892 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:38:17,894 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:38:17,897 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:38:17,899 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:38:17,900 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:38:17,901 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:38:17,903 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:38:17,906 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:38:17,915 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:38:17,916 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:38:17,917 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:38:17,918 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 [2020-07-20 13:38:17,939 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:38:17,942 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:38:17,944 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:38:17,944 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:38:17,944 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:38:17,945 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:38:17,945 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:38:17,945 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:38:17,945 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:38:17,945 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:38:17,945 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:38:17,945 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:38:17,946 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:38:17,946 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:38:17,946 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:38:17,946 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:38:17,946 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:38:17,947 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:38:17,947 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:38:17,947 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:38:17,947 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:38:17,947 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:38:17,948 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:38:17,948 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:38:17,948 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:38:17,948 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:38:17,948 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:17,949 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:38:17,949 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:38:17,949 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:38:18,260 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:38:18,275 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:38:18,279 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:38:18,281 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:38:18,282 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:38:18,283 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o1000.c [2020-07-20 13:38:18,379 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5799834b8/36b52c2d0558400f930a3afe2de74bc8/FLAGb5a6853a3 [2020-07-20 13:38:18,956 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:38:18,957 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o1000.c [2020-07-20 13:38:18,964 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5799834b8/36b52c2d0558400f930a3afe2de74bc8/FLAGb5a6853a3 [2020-07-20 13:38:19,289 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5799834b8/36b52c2d0558400f930a3afe2de74bc8 [2020-07-20 13:38:19,301 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:38:19,305 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:38:19,307 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:38:19,307 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:38:19,314 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:38:19,316 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:38:19" (1/1) ... [2020-07-20 13:38:19,320 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6227381e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:19, skipping insertion in model container [2020-07-20 13:38:19,320 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:38:19" (1/1) ... [2020-07-20 13:38:19,331 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:38:19,352 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:38:19,528 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:38:19,533 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:38:19,550 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:38:19,568 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:38:19,568 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:19 WrapperNode [2020-07-20 13:38:19,568 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:38:19,569 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:38:19,570 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:38:19,570 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:38:19,586 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:19" (1/1) ... [2020-07-20 13:38:19,586 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:19" (1/1) ... [2020-07-20 13:38:19,593 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:19" (1/1) ... [2020-07-20 13:38:19,594 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:19" (1/1) ... [2020-07-20 13:38:19,598 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:19" (1/1) ... [2020-07-20 13:38:19,601 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:19" (1/1) ... [2020-07-20 13:38:19,602 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:19" (1/1) ... [2020-07-20 13:38:19,603 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:38:19,604 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:38:19,604 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:38:19,604 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:38:19,605 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:19" (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 [2020-07-20 13:38:19,767 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:38:19,767 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:38:19,768 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 13:38:19,768 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:38:19,768 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 13:38:19,768 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:38:19,768 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 13:38:19,768 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:38:19,768 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:38:19,769 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:38:19,953 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:38:19,953 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:38:19,957 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:38:19 BoogieIcfgContainer [2020-07-20 13:38:19,958 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:38:19,959 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:38:19,959 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:38:19,964 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:38:19,965 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:38:19" (1/3) ... [2020-07-20 13:38:19,966 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20127c7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:38:19, skipping insertion in model container [2020-07-20 13:38:19,967 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:19" (2/3) ... [2020-07-20 13:38:19,967 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20127c7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:38:19, skipping insertion in model container [2020-07-20 13:38:19,968 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:38:19" (3/3) ... [2020-07-20 13:38:19,972 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o1000.c [2020-07-20 13:38:19,982 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:38:19,989 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:38:20,006 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:38:20,040 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:38:20,041 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:38:20,041 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:38:20,041 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:38:20,041 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:38:20,041 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:38:20,042 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:38:20,042 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:38:20,066 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 13:38:20,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:38:20,075 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:20,076 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:20,076 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:20,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:20,084 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-20 13:38:20,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:20,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530985757] [2020-07-20 13:38:20,095 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:20,203 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:38:20,204 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:20,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 13:38:20,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:20,320 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:38:20,321 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:38:20,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530985757] [2020-07-20 13:38:20,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:38:20,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:38:20,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407761254] [2020-07-20 13:38:20,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:38:20,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:20,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:38:20,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:38:20,350 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 13:38:20,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:20,424 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-20 13:38:20,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:38:20,426 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:38:20,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:20,439 INFO L225 Difference]: With dead ends: 32 [2020-07-20 13:38:20,439 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 13:38:20,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:38:20,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 13:38:20,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 13:38:20,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 13:38:20,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 13:38:20,501 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 13:38:20,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:20,501 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 13:38:20,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:38:20,502 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 13:38:20,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 13:38:20,504 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:20,505 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:20,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:20,720 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:20,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:20,721 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-20 13:38:20,722 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:20,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1927290392] [2020-07-20 13:38:20,723 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:20,767 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:20,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:20,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 13:38:20,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:20,848 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 13:38:20,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:21,054 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 13:38:21,054 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1927290392] [2020-07-20 13:38:21,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:21,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 13:38:21,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788479596] [2020-07-20 13:38:21,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:38:21,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:21,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:38:21,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:38:21,060 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-20 13:38:23,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:23,222 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-20 13:38:23,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:38:23,224 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-20 13:38:23,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:23,226 INFO L225 Difference]: With dead ends: 30 [2020-07-20 13:38:23,226 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 13:38:23,229 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:38:23,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 13:38:23,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 13:38:23,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 13:38:23,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 13:38:23,248 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-20 13:38:23,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:23,249 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 13:38:23,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:38:23,251 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 13:38:23,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 13:38:23,254 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:23,255 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:23,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:23,471 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:23,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:23,472 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-20 13:38:23,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:23,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1596022887] [2020-07-20 13:38:23,473 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:23,532 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:23,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:23,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 13:38:23,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:23,661 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 13:38:23,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:24,341 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 13:38:24,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1596022887] [2020-07-20 13:38:24,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:24,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-20 13:38:24,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035337385] [2020-07-20 13:38:24,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:38:24,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:24,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:38:24,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:38:24,345 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-20 13:38:26,873 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 13:38:26,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:26,907 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-20 13:38:26,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 13:38:26,908 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-20 13:38:26,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:26,909 INFO L225 Difference]: With dead ends: 42 [2020-07-20 13:38:26,910 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 13:38:26,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:38:26,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 13:38:26,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 13:38:26,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:38:26,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-20 13:38:26,921 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-20 13:38:26,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:26,922 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-20 13:38:26,922 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:38:26,922 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-20 13:38:26,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 13:38:26,924 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:26,925 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:27,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:27,126 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:27,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:27,127 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-20 13:38:27,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:27,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [540118102] [2020-07-20 13:38:27,128 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:27,219 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:27,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:27,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 13:38:27,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:27,493 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 13:38:27,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:31,225 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 76 refuted. 1 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 13:38:31,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [540118102] [2020-07-20 13:38:31,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:31,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-20 13:38:31,226 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760890274] [2020-07-20 13:38:31,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 13:38:31,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:31,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 13:38:31,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1075, Unknown=1, NotChecked=0, Total=1260 [2020-07-20 13:38:31,229 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-20 13:38:32,350 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-20 13:38:39,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:39,238 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-20 13:38:39,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 13:38:39,242 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-20 13:38:39,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:39,244 INFO L225 Difference]: With dead ends: 66 [2020-07-20 13:38:39,244 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 13:38:39,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=382, Invalid=1873, Unknown=1, NotChecked=0, Total=2256 [2020-07-20 13:38:39,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 13:38:39,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-20 13:38:39,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:38:39,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-20 13:38:39,260 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-20 13:38:39,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:39,263 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-20 13:38:39,263 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 13:38:39,263 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-20 13:38:39,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-20 13:38:39,267 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:39,268 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:39,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:39,469 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:39,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:39,470 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-20 13:38:39,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:39,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1512017101] [2020-07-20 13:38:39,472 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:40,880 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:40,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:40,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 13:38:40,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:41,672 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 13:38:41,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:12,289 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 337 refuted. 8 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 13:39:12,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1512017101] [2020-07-20 13:39:12,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:12,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-20 13:39:12,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715390082] [2020-07-20 13:39:12,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-20 13:39:12,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:12,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-20 13:39:12,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=3928, Unknown=12, NotChecked=0, Total=4556 [2020-07-20 13:39:12,296 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-20 13:39:17,713 WARN L193 SmtUtils]: Spent 468.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 13 [2020-07-20 13:39:22,918 WARN L193 SmtUtils]: Spent 1.47 s on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-20 13:39:28,007 WARN L193 SmtUtils]: Spent 567.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 13 [2020-07-20 13:39:34,228 WARN L193 SmtUtils]: Spent 2.85 s on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-20 13:39:38,185 WARN L193 SmtUtils]: Spent 366.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 13 [2020-07-20 13:39:42,081 WARN L193 SmtUtils]: Spent 467.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-20 13:39:44,966 WARN L193 SmtUtils]: Spent 409.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 13 [2020-07-20 13:39:48,459 WARN L193 SmtUtils]: Spent 498.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-20 13:39:58,580 WARN L193 SmtUtils]: Spent 2.36 s on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-20 13:40:05,032 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-20 13:40:14,167 WARN L193 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-20 13:40:18,647 WARN L193 SmtUtils]: Spent 2.34 s on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-20 13:40:28,001 WARN L193 SmtUtils]: Spent 4.49 s on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-20 13:40:33,633 WARN L193 SmtUtils]: Spent 445.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-20 13:40:41,744 WARN L193 SmtUtils]: Spent 2.26 s on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-20 13:40:44,224 WARN L193 SmtUtils]: Spent 366.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-20 13:40:52,566 WARN L193 SmtUtils]: Spent 2.19 s on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-20 13:40:54,620 WARN L838 $PredicateComparison]: unable to prove that (and (< (mod (+ |c_id_#res| 6) 4294967296) 1000) (< (mod |c_id_#res| 4294967296) 1000) (< (mod (+ |c_id_#res| 3) 4294967296) 1000) (< (mod (+ |c_id_#res| 4) 4294967296) 1000) (< (mod (+ |c_id_#res| 5) 4294967296) 1000) (< (mod (+ |c_id_#res| 1) 4294967296) 1000) (< (mod (+ |c_id_#res| 2) 4294967296) 1000)) is different from false [2020-07-20 13:41:01,513 WARN L193 SmtUtils]: Spent 2.17 s on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-20 13:41:06,346 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-20 13:41:16,197 WARN L193 SmtUtils]: Spent 2.16 s on a formula simplification. DAG size of input: 21 DAG size of output: 11 [2020-07-20 13:41:34,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:41:34,416 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2020-07-20 13:41:34,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-20 13:41:34,418 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-20 13:41:34,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:41:34,422 INFO L225 Difference]: With dead ends: 114 [2020-07-20 13:41:34,423 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 13:41:34,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 667 ImplicationChecksByTransitivity, 167.8s TimeCoverageRelationStatistics Valid=1485, Invalid=7426, Unknown=23, NotChecked=186, Total=9120 [2020-07-20 13:41:34,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 13:41:34,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-20 13:41:34,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-20 13:41:34,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2020-07-20 13:41:34,460 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 103 [2020-07-20 13:41:34,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:41:34,461 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2020-07-20 13:41:34,461 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-20 13:41:34,461 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2020-07-20 13:41:34,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-20 13:41:34,465 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:41:34,466 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:41:34,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:34,670 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:41:34,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:41:34,671 INFO L82 PathProgramCache]: Analyzing trace with hash -935230737, now seen corresponding path program 5 times [2020-07-20 13:41:34,671 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:41:34,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463304439] [2020-07-20 13:41:34,671 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:35,635 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:41:35,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:41:35,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 131 conjunts are in the unsatisfiable core [2020-07-20 13:41:35,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:41:39,690 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-20 13:41:39,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:43:55,271 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1403 refuted. 54 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-20 13:43:55,272 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463304439] [2020-07-20 13:43:55,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:43:55,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-20 13:43:55,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752837458] [2020-07-20 13:43:55,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-20 13:43:55,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:43:55,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-20 13:43:55,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2248, Invalid=14996, Unknown=48, NotChecked=0, Total=17292 [2020-07-20 13:43:55,285 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 132 states. [2020-07-20 13:45:01,290 WARN L193 SmtUtils]: Spent 6.28 s on a formula simplification. DAG size of input: 158 DAG size of output: 13 [2020-07-20 13:46:01,549 WARN L193 SmtUtils]: Spent 5.40 s on a formula simplification. DAG size of input: 156 DAG size of output: 11 [2020-07-20 13:46:54,844 WARN L193 SmtUtils]: Spent 5.74 s on a formula simplification. DAG size of input: 153 DAG size of output: 13 [2020-07-20 13:47:45,857 WARN L193 SmtUtils]: Spent 3.89 s on a formula simplification. DAG size of input: 151 DAG size of output: 11 [2020-07-20 13:48:52,675 WARN L193 SmtUtils]: Spent 8.32 s on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-20 13:49:42,713 WARN L193 SmtUtils]: Spent 4.76 s on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2020-07-20 13:50:40,418 WARN L193 SmtUtils]: Spent 3.12 s on a formula simplification. DAG size of input: 143 DAG size of output: 13 [2020-07-20 13:51:27,649 WARN L193 SmtUtils]: Spent 5.74 s on a formula simplification. DAG size of input: 141 DAG size of output: 11 [2020-07-20 13:52:09,878 WARN L193 SmtUtils]: Spent 2.98 s on a formula simplification. DAG size of input: 138 DAG size of output: 13 [2020-07-20 13:52:50,302 WARN L193 SmtUtils]: Spent 3.20 s on a formula simplification. DAG size of input: 136 DAG size of output: 11