/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 BIGGEST_EQUIVALENCE_CLASS --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/array_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:12:15,848 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:12:15,850 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:12:15,865 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:12:15,865 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:12:15,867 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:12:15,868 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:12:15,870 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:12:15,872 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:12:15,872 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:12:15,873 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:12:15,875 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:12:15,875 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:12:15,876 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:12:15,877 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:12:15,878 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:12:15,879 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:12:15,880 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:12:15,882 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:12:15,885 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:12:15,886 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:12:15,888 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:12:15,889 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:12:15,890 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:12:15,892 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 23:12:15,901 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:12:15,902 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:12:15,902 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:12:15,903 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 [2020-07-21 23:12:15,918 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:12:15,919 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:12:15,920 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:12:15,920 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:12:15,920 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:12:15,921 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:12:15,921 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:12:15,921 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:12:15,921 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:12:15,921 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:12:15,921 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:12:15,922 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:12:15,922 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:12:15,922 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:12:15,922 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:12:15,922 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:12:15,923 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:12:15,923 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:12:15,923 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:12:15,923 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:12:15,924 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:12:15,924 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:12:15,924 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:12:15,924 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:12:15,924 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:12:15,925 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:12:15,925 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:15,925 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:12:15,925 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:12:15,925 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 23:12:16,219 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:12:16,244 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:12:16,249 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:12:16,256 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:12:16,256 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:12:16,258 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-07-21 23:12:16,340 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ef6a63e83/afa09194963c45bdaa64bc8cb21dafe5/FLAG321ab96ca [2020-07-21 23:12:16,750 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:12:16,750 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-07-21 23:12:16,758 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ef6a63e83/afa09194963c45bdaa64bc8cb21dafe5/FLAG321ab96ca [2020-07-21 23:12:17,120 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ef6a63e83/afa09194963c45bdaa64bc8cb21dafe5 [2020-07-21 23:12:17,130 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:12:17,134 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:12:17,135 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:12:17,135 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:12:17,139 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:12:17,141 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:12:17" (1/1) ... [2020-07-21 23:12:17,143 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68aa2941 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:17, skipping insertion in model container [2020-07-21 23:12:17,143 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:12:17" (1/1) ... [2020-07-21 23:12:17,151 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:12:17,169 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:12:17,323 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:12:17,328 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:12:17,344 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:12:17,362 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:12:17,363 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:17 WrapperNode [2020-07-21 23:12:17,363 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:12:17,364 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:12:17,364 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:12:17,364 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:12:17,459 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:17" (1/1) ... [2020-07-21 23:12:17,460 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:17" (1/1) ... [2020-07-21 23:12:17,468 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:17" (1/1) ... [2020-07-21 23:12:17,468 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:17" (1/1) ... [2020-07-21 23:12:17,475 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:17" (1/1) ... [2020-07-21 23:12:17,480 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:17" (1/1) ... [2020-07-21 23:12:17,481 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:17" (1/1) ... [2020-07-21 23:12:17,482 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:12:17,483 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:12:17,483 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:12:17,484 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:12:17,489 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:17" (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 [2020-07-21 23:12:17,547 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:12:17,547 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:12:17,547 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 23:12:17,547 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:12:17,548 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:12:17,548 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 23:12:17,548 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:12:17,548 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 23:12:17,548 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 23:12:17,548 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 23:12:17,549 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 23:12:17,549 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:12:17,549 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:12:17,747 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:12:17,747 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 23:12:17,751 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:12:17 BoogieIcfgContainer [2020-07-21 23:12:17,751 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:12:17,752 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:12:17,753 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:12:17,756 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:12:17,756 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:12:17" (1/3) ... [2020-07-21 23:12:17,757 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60318d13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:12:17, skipping insertion in model container [2020-07-21 23:12:17,757 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:17" (2/3) ... [2020-07-21 23:12:17,758 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60318d13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:12:17, skipping insertion in model container [2020-07-21 23:12:17,758 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:12:17" (3/3) ... [2020-07-21 23:12:17,759 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-07-21 23:12:17,771 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:12:17,778 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:12:17,792 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:12:17,818 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:12:17,818 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:12:17,818 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:12:17,818 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:12:17,819 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:12:17,819 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:12:17,819 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:12:17,819 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:12:17,839 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-21 23:12:17,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 23:12:17,845 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:17,847 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:17,847 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:17,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:17,854 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-07-21 23:12:17,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:17,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [706384470] [2020-07-21 23:12:17,864 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 [2020-07-21 23:12:17,957 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:12:17,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:17,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 23:12:17,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:18,001 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:18,002 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:12:18,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [706384470] [2020-07-21 23:12:18,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:12:18,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 23:12:18,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367467238] [2020-07-21 23:12:18,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 23:12:18,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:18,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 23:12:18,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 23:12:18,056 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-07-21 23:12:18,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:18,094 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-07-21 23:12:18,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 23:12:18,096 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-07-21 23:12:18,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:18,104 INFO L225 Difference]: With dead ends: 34 [2020-07-21 23:12:18,104 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 23:12:18,107 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 23:12:18,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 23:12:18,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 23:12:18,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 23:12:18,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-21 23:12:18,148 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-21 23:12:18,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:18,148 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-21 23:12:18,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 23:12:18,149 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-21 23:12:18,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 23:12:18,150 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:18,150 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:18,364 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:18,364 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:18,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:18,366 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-07-21 23:12:18,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:18,367 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1135872606] [2020-07-21 23:12:18,367 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 [2020-07-21 23:12:18,423 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:12:18,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:18,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:12:18,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:18,464 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:18,464 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:12:18,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1135872606] [2020-07-21 23:12:18,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:12:18,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:12:18,466 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914274579] [2020-07-21 23:12:18,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:12:18,473 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:18,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:12:18,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:12:18,474 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 3 states. [2020-07-21 23:12:18,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:18,497 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-07-21 23:12:18,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:12:18,498 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-07-21 23:12:18,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:18,499 INFO L225 Difference]: With dead ends: 22 [2020-07-21 23:12:18,499 INFO L226 Difference]: Without dead ends: 16 [2020-07-21 23:12:18,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:12:18,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-21 23:12:18,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-07-21 23:12:18,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-21 23:12:18,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-21 23:12:18,507 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-07-21 23:12:18,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:18,507 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-21 23:12:18,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:12:18,508 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-21 23:12:18,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 23:12:18,509 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:18,509 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:18,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:18,723 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:18,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:18,724 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-07-21 23:12:18,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:18,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1332394591] [2020-07-21 23:12:18,725 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 [2020-07-21 23:12:18,790 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:12:18,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:18,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 23:12:18,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:18,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:18,847 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:12:18,908 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:18,910 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1332394591] [2020-07-21 23:12:18,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:12:18,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 23:12:18,911 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376449648] [2020-07-21 23:12:18,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 23:12:18,914 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:18,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 23:12:18,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 23:12:18,915 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 6 states. [2020-07-21 23:12:18,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:18,977 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2020-07-21 23:12:18,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 23:12:18,978 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-07-21 23:12:18,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:18,979 INFO L225 Difference]: With dead ends: 27 [2020-07-21 23:12:18,979 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 23:12:18,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 23:12:18,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 23:12:18,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 23:12:18,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 23:12:18,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-07-21 23:12:18,985 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2020-07-21 23:12:18,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:18,986 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-07-21 23:12:18,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 23:12:18,986 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-21 23:12:18,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 23:12:18,987 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:18,987 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:19,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:19,194 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:19,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:19,195 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 2 times [2020-07-21 23:12:19,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:19,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638314729] [2020-07-21 23:12:19,197 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 [2020-07-21 23:12:19,262 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:12:19,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:19,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 23:12:19,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:19,327 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:19,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:12:19,430 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:19,431 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638314729] [2020-07-21 23:12:19,431 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:12:19,432 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 23:12:19,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772748650] [2020-07-21 23:12:19,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 23:12:19,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:19,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 23:12:19,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 23:12:19,434 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 12 states. [2020-07-21 23:12:19,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:19,534 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-07-21 23:12:19,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 23:12:19,535 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 20 [2020-07-21 23:12:19,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:19,536 INFO L225 Difference]: With dead ends: 39 [2020-07-21 23:12:19,536 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 23:12:19,537 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 23:12:19,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 23:12:19,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 23:12:19,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 23:12:19,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-07-21 23:12:19,544 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2020-07-21 23:12:19,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:19,545 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-07-21 23:12:19,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 23:12:19,546 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-07-21 23:12:19,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-21 23:12:19,549 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:19,549 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:19,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:19,765 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:19,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:19,765 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 3 times [2020-07-21 23:12:19,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:19,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [922826538] [2020-07-21 23:12:19,766 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 [2020-07-21 23:12:19,843 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:12:19,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:19,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 23:12:19,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:19,993 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:19,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:12:20,247 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:20,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [922826538] [2020-07-21 23:12:20,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:12:20,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 23:12:20,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584207170] [2020-07-21 23:12:20,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 23:12:20,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:20,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 23:12:20,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 23:12:20,251 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 24 states. [2020-07-21 23:12:20,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:20,396 INFO L93 Difference]: Finished difference Result 63 states and 74 transitions. [2020-07-21 23:12:20,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 23:12:20,398 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 32 [2020-07-21 23:12:20,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:20,399 INFO L225 Difference]: With dead ends: 63 [2020-07-21 23:12:20,399 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 23:12:20,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 23:12:20,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 23:12:20,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-21 23:12:20,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 23:12:20,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-07-21 23:12:20,421 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 32 [2020-07-21 23:12:20,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:20,425 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-07-21 23:12:20,425 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 23:12:20,426 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-07-21 23:12:20,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 23:12:20,427 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:20,427 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:20,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:20,646 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:20,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:20,647 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 4 times [2020-07-21 23:12:20,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:20,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [522607044] [2020-07-21 23:12:20,648 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 [2020-07-21 23:12:20,872 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:12:20,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:20,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 23:12:20,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:21,313 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:21,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:12:22,237 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:22,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [522607044] [2020-07-21 23:12:22,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:12:22,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-21 23:12:22,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116188697] [2020-07-21 23:12:22,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 23:12:22,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:22,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 23:12:22,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 23:12:22,242 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 48 states. [2020-07-21 23:12:22,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:22,456 INFO L93 Difference]: Finished difference Result 111 states and 134 transitions. [2020-07-21 23:12:22,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 23:12:22,457 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 56 [2020-07-21 23:12:22,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:22,459 INFO L225 Difference]: With dead ends: 111 [2020-07-21 23:12:22,459 INFO L226 Difference]: Without dead ends: 105 [2020-07-21 23:12:22,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 23:12:22,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-07-21 23:12:22,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2020-07-21 23:12:22,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-07-21 23:12:22,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-07-21 23:12:22,474 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 56 [2020-07-21 23:12:22,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:22,474 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-07-21 23:12:22,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 23:12:22,475 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-07-21 23:12:22,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-07-21 23:12:22,478 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:22,478 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:22,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:22,693 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:22,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:22,694 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 5 times [2020-07-21 23:12:22,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:22,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1029886558] [2020-07-21 23:12:22,695 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 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:23,994 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:12:23,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:24,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 23:12:24,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:25,281 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:25,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:12:28,849 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:28,850 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1029886558] [2020-07-21 23:12:28,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:12:28,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-21 23:12:28,851 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222044720] [2020-07-21 23:12:28,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-21 23:12:28,852 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:28,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-21 23:12:28,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 23:12:28,857 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 96 states. [2020-07-21 23:12:29,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:29,338 INFO L93 Difference]: Finished difference Result 207 states and 254 transitions. [2020-07-21 23:12:29,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 23:12:29,339 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 104 [2020-07-21 23:12:29,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:29,342 INFO L225 Difference]: With dead ends: 207 [2020-07-21 23:12:29,342 INFO L226 Difference]: Without dead ends: 201 [2020-07-21 23:12:29,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 23:12:29,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-21 23:12:29,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2020-07-21 23:12:29,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2020-07-21 23:12:29,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2020-07-21 23:12:29,365 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 104 [2020-07-21 23:12:29,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:29,365 INFO L479 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2020-07-21 23:12:29,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-21 23:12:29,365 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2020-07-21 23:12:29,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2020-07-21 23:12:29,368 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:29,368 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:29,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:29,584 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:29,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:29,585 INFO L82 PathProgramCache]: Analyzing trace with hash 1695638553, now seen corresponding path program 6 times [2020-07-21 23:12:29,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:29,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1409573907] [2020-07-21 23:12:29,586 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 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:14:20,858 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:14:20,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:14:21,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-21 23:14:21,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:14:26,351 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:14:26,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:14:39,788 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:14:39,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1409573907] [2020-07-21 23:14:39,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:14:39,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97] total 192 [2020-07-21 23:14:39,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807423843] [2020-07-21 23:14:39,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 192 states [2020-07-21 23:14:39,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:14:39,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2020-07-21 23:14:39,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672 [2020-07-21 23:14:39,804 INFO L87 Difference]: Start difference. First operand 201 states and 201 transitions. Second operand 192 states. [2020-07-21 23:14:40,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:14:40,903 INFO L93 Difference]: Finished difference Result 399 states and 494 transitions. [2020-07-21 23:14:40,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2020-07-21 23:14:40,904 INFO L78 Accepts]: Start accepts. Automaton has 192 states. Word has length 200 [2020-07-21 23:14:40,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:14:40,908 INFO L225 Difference]: With dead ends: 399 [2020-07-21 23:14:40,908 INFO L226 Difference]: Without dead ends: 393 [2020-07-21 23:14:40,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 209 SyntacticMatches, 0 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672 [2020-07-21 23:14:40,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2020-07-21 23:14:40,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 393. [2020-07-21 23:14:40,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 393 states. [2020-07-21 23:14:40,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 393 states to 393 states and 393 transitions. [2020-07-21 23:14:40,943 INFO L78 Accepts]: Start accepts. Automaton has 393 states and 393 transitions. Word has length 200 [2020-07-21 23:14:40,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:14:40,944 INFO L479 AbstractCegarLoop]: Abstraction has 393 states and 393 transitions. [2020-07-21 23:14:40,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 192 states. [2020-07-21 23:14:40,944 INFO L276 IsEmpty]: Start isEmpty. Operand 393 states and 393 transitions. [2020-07-21 23:14:40,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 393 [2020-07-21 23:14:40,950 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:14:40,950 INFO L422 BasicCegarLoop]: trace histogram [190, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:14:41,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:14:41,165 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:14:41,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:14:41,165 INFO L82 PathProgramCache]: Analyzing trace with hash 576174297, now seen corresponding path program 7 times [2020-07-21 23:14:41,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:14:41,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [824820904] [2020-07-21 23:14:41,166 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in