/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_VARIABLES --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/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:45:16,908 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:45:16,911 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:45:16,928 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:45:16,928 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:45:16,931 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:45:16,932 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:45:16,945 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:45:16,947 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:45:16,949 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:45:16,951 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:45:16,952 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:45:16,953 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:45:16,956 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:45:16,958 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:45:16,959 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:45:16,960 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:45:16,961 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:45:16,963 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:45:16,965 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:45:16,966 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:45:16,967 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:45:16,968 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:45:16,969 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:45:16,971 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:45:16,978 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:45:16,979 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:45:16,980 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:45:16,980 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 17:45:16,995 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:45:16,995 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:45:16,996 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:45:16,996 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:45:16,997 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:45:16,997 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:45:16,997 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:45:16,997 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:45:16,997 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:45:16,998 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:45:16,998 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:45:16,998 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:45:16,998 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:45:16,998 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:45:16,999 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:45:16,999 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:45:16,999 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:45:16,999 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:45:16,999 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:45:17,000 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:45:17,000 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:45:17,000 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:45:17,000 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:45:17,000 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:45:17,001 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:45:17,001 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:45:17,001 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:45:17,001 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:45:17,001 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:45:17,002 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_VARIABLES 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 17:45:17,284 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:45:17,301 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:45:17,306 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:45:17,308 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:45:17,308 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:45:17,309 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-07-20 17:45:17,384 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/788c2ade8/3fcfa3ead18b46bc9ed4e8c959af6476/FLAG878386e93 [2020-07-20 17:45:17,821 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:45:17,821 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-07-20 17:45:17,831 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/788c2ade8/3fcfa3ead18b46bc9ed4e8c959af6476/FLAG878386e93 [2020-07-20 17:45:18,198 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/788c2ade8/3fcfa3ead18b46bc9ed4e8c959af6476 [2020-07-20 17:45:18,207 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:45:18,210 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:45:18,211 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:45:18,212 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:45:18,215 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:45:18,217 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:45:18" (1/1) ... [2020-07-20 17:45:18,220 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4dffb5e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:45:18, skipping insertion in model container [2020-07-20 17:45:18,220 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:45:18" (1/1) ... [2020-07-20 17:45:18,228 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:45:18,245 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:45:18,416 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:45:18,421 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:45:18,436 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:45:18,451 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:45:18,452 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:45:18 WrapperNode [2020-07-20 17:45:18,452 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:45:18,453 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:45:18,453 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:45:18,453 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:45:18,463 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:45:18" (1/1) ... [2020-07-20 17:45:18,464 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:45:18" (1/1) ... [2020-07-20 17:45:18,468 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:45:18" (1/1) ... [2020-07-20 17:45:18,469 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:45:18" (1/1) ... [2020-07-20 17:45:18,472 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:45:18" (1/1) ... [2020-07-20 17:45:18,477 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:45:18" (1/1) ... [2020-07-20 17:45:18,478 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:45:18" (1/1) ... [2020-07-20 17:45:18,480 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:45:18,480 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:45:18,480 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:45:18,481 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:45:18,482 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:45:18" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:45:18,628 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:45:18,628 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:45:18,628 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:45:18,629 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:45:18,629 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:45:18,629 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:45:18,629 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:45:18,629 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:45:18,629 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:45:18,784 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:45:18,785 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 17:45:18,788 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:45:18 BoogieIcfgContainer [2020-07-20 17:45:18,788 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:45:18,790 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:45:18,790 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:45:18,793 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:45:18,794 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:45:18" (1/3) ... [2020-07-20 17:45:18,795 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@310a5ecf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:45:18, skipping insertion in model container [2020-07-20 17:45:18,795 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:45:18" (2/3) ... [2020-07-20 17:45:18,795 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@310a5ecf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:45:18, skipping insertion in model container [2020-07-20 17:45:18,796 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:45:18" (3/3) ... [2020-07-20 17:45:18,798 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-07-20 17:45:18,807 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:45:18,815 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:45:18,833 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:45:18,859 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:45:18,859 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:45:18,860 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:45:18,860 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:45:18,860 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:45:18,860 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:45:18,860 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:45:18,860 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:45:18,880 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-07-20 17:45:18,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 17:45:18,887 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:45:18,888 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:45:18,889 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:45:18,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:45:18,895 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-07-20 17:45:18,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:45:18,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449030374] [2020-07-20 17:45:18,903 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 17:45:18,960 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:45:18,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:45:18,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:45:18,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:45:19,010 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 17:45:19,011 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:45:19,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449030374] [2020-07-20 17:45:19,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:45:19,013 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:45:19,014 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220534047] [2020-07-20 17:45:19,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:45:19,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:45:19,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:45:19,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:45:19,037 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-07-20 17:45:19,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:45:19,079 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-07-20 17:45:19,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:45:19,081 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-20 17:45:19,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:45:19,090 INFO L225 Difference]: With dead ends: 29 [2020-07-20 17:45:19,090 INFO L226 Difference]: Without dead ends: 12 [2020-07-20 17:45:19,094 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:45:19,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-07-20 17:45:19,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-07-20 17:45:19,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-07-20 17:45:19,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-07-20 17:45:19,140 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-07-20 17:45:19,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:45:19,140 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-07-20 17:45:19,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:45:19,141 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-07-20 17:45:19,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-20 17:45:19,141 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:45:19,142 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:45:19,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:45:19,357 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:45:19,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:45:19,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-07-20 17:45:19,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:45:19,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1447015461] [2020-07-20 17:45:19,360 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 17:45:19,391 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:45:19,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:45:19,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 17:45:19,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:45:19,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:45:19,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:45:19,480 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:45:19,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1447015461] [2020-07-20 17:45:19,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:45:19,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 17:45:19,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431530492] [2020-07-20 17:45:19,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:45:19,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:45:19,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:45:19,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:45:19,486 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 6 states. [2020-07-20 17:45:19,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:45:19,541 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-07-20 17:45:19,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 17:45:19,542 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-07-20 17:45:19,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:45:19,544 INFO L225 Difference]: With dead ends: 20 [2020-07-20 17:45:19,544 INFO L226 Difference]: Without dead ends: 15 [2020-07-20 17:45:19,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:45:19,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-20 17:45:19,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-20 17:45:19,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-20 17:45:19,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-20 17:45:19,551 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2020-07-20 17:45:19,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:45:19,551 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-20 17:45:19,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:45:19,552 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-20 17:45:19,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 17:45:19,553 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:45:19,553 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:45:19,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:45:19,770 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:45:19,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:45:19,771 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 2 times [2020-07-20 17:45:19,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:45:19,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1049605970] [2020-07-20 17:45:19,772 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 17:45:19,840 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:45:19,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:45:19,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 17:45:19,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:45:19,903 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:45:19,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:45:20,051 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:45:20,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1049605970] [2020-07-20 17:45:20,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:45:20,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 17:45:20,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663685713] [2020-07-20 17:45:20,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 17:45:20,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:45:20,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 17:45:20,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:45:20,057 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 12 states. [2020-07-20 17:45:20,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:45:20,432 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-07-20 17:45:20,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 17:45:20,432 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2020-07-20 17:45:20,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:45:20,433 INFO L225 Difference]: With dead ends: 26 [2020-07-20 17:45:20,433 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 17:45:20,435 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=106, Invalid=166, Unknown=0, NotChecked=0, Total=272 [2020-07-20 17:45:20,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 17:45:20,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 17:45:20,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 17:45:20,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-07-20 17:45:20,442 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2020-07-20 17:45:20,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:45:20,443 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-07-20 17:45:20,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 17:45:20,443 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-20 17:45:20,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:45:20,444 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:45:20,444 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:45:20,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:45:20,650 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:45:20,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:45:20,650 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 3 times [2020-07-20 17:45:20,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:45:20,651 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642560481] [2020-07-20 17:45:20,651 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 17:59:14,060 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:59:14,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:14,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 17:59:14,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:14,264 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:14,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:14,792 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:14,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642560481] [2020-07-20 17:59:14,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:59:14,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 17:59:14,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941039250] [2020-07-20 17:59:14,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 17:59:14,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:14,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 17:59:14,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2020-07-20 17:59:14,795 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 24 states. [2020-07-20 17:59:23,421 WARN L193 SmtUtils]: Spent 8.25 s on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 17:59:28,181 WARN L193 SmtUtils]: Spent 4.54 s on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 17:59:30,248 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ c_main_~x~0 4294967280) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967290) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967292) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967282) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967294) 4294967296)) (< 0 (mod c_main_~x~0 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967284) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967286) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967288) 4294967296))) is different from false [2020-07-20 17:59:30,606 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 17:59:30,962 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 17:59:32,502 WARN L193 SmtUtils]: Spent 613.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 17:59:32,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:32,507 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-07-20 17:59:32,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 17:59:32,508 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 20 [2020-07-20 17:59:32,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:32,509 INFO L225 Difference]: With dead ends: 38 [2020-07-20 17:59:32,509 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 17:59:32,511 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=401, Invalid=724, Unknown=1, NotChecked=64, Total=1190 [2020-07-20 17:59:32,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 17:59:32,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 17:59:32,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 17:59:32,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-07-20 17:59:32,521 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2020-07-20 17:59:32,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:32,522 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-07-20 17:59:32,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 17:59:32,522 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-07-20 17:59:32,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-20 17:59:32,524 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:32,524 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:59:32,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:32,725 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:32,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:32,726 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 4 times [2020-07-20 17:59:32,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:32,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1046867810] [2020-07-20 17:59:32,728 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