/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 20:00:42,798 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 20:00:42,800 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 20:00:42,814 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 20:00:42,814 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 20:00:42,815 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 20:00:42,817 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 20:00:42,819 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 20:00:42,821 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 20:00:42,822 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 20:00:42,823 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 20:00:42,824 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 20:00:42,824 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 20:00:42,825 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 20:00:42,826 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 20:00:42,827 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 20:00:42,828 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 20:00:42,829 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 20:00:42,831 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 20:00:42,833 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 20:00:42,835 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 20:00:42,836 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 20:00:42,837 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 20:00:42,838 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 20:00:42,841 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 20:00:42,849 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 20:00:42,850 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 20:00:42,851 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 20:00:42,852 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 20:00:42,873 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 20:00:42,873 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 20:00:42,874 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 20:00:42,875 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 20:00:42,875 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 20:00:42,875 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 20:00:42,875 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 20:00:42,876 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 20:00:42,876 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 20:00:42,876 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 20:00:42,876 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 20:00:42,876 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 20:00:42,877 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 20:00:42,877 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 20:00:42,877 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 20:00:42,877 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 20:00:42,877 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 20:00:42,878 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 20:00:42,878 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 20:00:42,878 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 20:00:42,878 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 20:00:42,879 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 20:00:42,879 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 20:00:42,879 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 20:00:42,879 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 20:00:42,879 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 20:00:42,880 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:00:42,880 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 20:00:42,880 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 20:00:42,880 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 -> DAGSIZE 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 -> 2 [2020-07-21 20:00:43,235 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 20:00:43,251 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 20:00:43,255 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 20:00:43,256 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 20:00:43,257 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 20:00:43,258 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-07-21 20:00:43,338 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7527f400d/a62b33a9b86144468dbadb39dec57cc3/FLAGd49f3c142 [2020-07-21 20:00:43,893 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 20:00:43,894 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-07-21 20:00:43,901 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7527f400d/a62b33a9b86144468dbadb39dec57cc3/FLAGd49f3c142 [2020-07-21 20:00:44,248 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7527f400d/a62b33a9b86144468dbadb39dec57cc3 [2020-07-21 20:00:44,258 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 20:00:44,261 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 20:00:44,262 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 20:00:44,263 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 20:00:44,268 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 20:00:44,269 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:00:44" (1/1) ... [2020-07-21 20:00:44,272 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75f44d73 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:00:44, skipping insertion in model container [2020-07-21 20:00:44,273 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:00:44" (1/1) ... [2020-07-21 20:00:44,282 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 20:00:44,302 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 20:00:44,489 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:00:44,498 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 20:00:44,517 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:00:44,536 INFO L208 MainTranslator]: Completed translation [2020-07-21 20:00:44,537 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:00:44 WrapperNode [2020-07-21 20:00:44,537 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 20:00:44,538 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 20:00:44,538 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 20:00:44,538 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 20:00:44,665 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:00:44" (1/1) ... [2020-07-21 20:00:44,666 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:00:44" (1/1) ... [2020-07-21 20:00:44,676 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:00:44" (1/1) ... [2020-07-21 20:00:44,676 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:00:44" (1/1) ... [2020-07-21 20:00:44,687 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:00:44" (1/1) ... [2020-07-21 20:00:44,693 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:00:44" (1/1) ... [2020-07-21 20:00:44,695 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:00:44" (1/1) ... [2020-07-21 20:00:44,700 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 20:00:44,701 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 20:00:44,703 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 20:00:44,703 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 20:00:44,705 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:00:44" (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 20:00:44,769 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 20:00:44,769 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 20:00:44,770 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-07-21 20:00:44,770 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 20:00:44,770 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 20:00:44,770 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 20:00:44,770 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-21 20:00:44,770 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-21 20:00:44,770 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 20:00:44,771 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 20:00:44,771 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 20:00:44,771 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 20:00:44,771 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-21 20:00:44,771 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 20:00:44,771 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 20:00:44,772 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 20:00:45,090 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 20:00:45,091 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-21 20:00:45,095 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:00:45 BoogieIcfgContainer [2020-07-21 20:00:45,095 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 20:00:45,097 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 20:00:45,097 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 20:00:45,101 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 20:00:45,102 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 08:00:44" (1/3) ... [2020-07-21 20:00:45,102 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45f75c33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:00:45, skipping insertion in model container [2020-07-21 20:00:45,103 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:00:44" (2/3) ... [2020-07-21 20:00:45,103 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45f75c33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:00:45, skipping insertion in model container [2020-07-21 20:00:45,103 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:00:45" (3/3) ... [2020-07-21 20:00:45,106 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-07-21 20:00:45,117 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 20:00:45,126 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 20:00:45,155 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 20:00:45,196 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 20:00:45,196 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 20:00:45,196 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 20:00:45,197 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 20:00:45,197 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 20:00:45,197 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 20:00:45,197 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 20:00:45,198 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 20:00:45,217 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-21 20:00:45,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 20:00:45,222 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:00:45,223 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:00:45,224 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:00:45,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:00:45,230 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-07-21 20:00:45,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:00:45,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307503507] [2020-07-21 20:00:45,241 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 20:00:45,389 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:00:45,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:00:45,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 20:00:45,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:00:45,426 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 20:00:45,426 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:00:45,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307503507] [2020-07-21 20:00:45,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:00:45,429 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 20:00:45,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010767749] [2020-07-21 20:00:45,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 20:00:45,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:00:45,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 20:00:45,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 20:00:45,449 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2020-07-21 20:00:45,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:00:45,471 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-07-21 20:00:45,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 20:00:45,473 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2020-07-21 20:00:45,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:00:45,484 INFO L225 Difference]: With dead ends: 42 [2020-07-21 20:00:45,484 INFO L226 Difference]: Without dead ends: 20 [2020-07-21 20:00:45,489 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 16 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 20:00:45,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-21 20:00:45,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-21 20:00:45,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-21 20:00:45,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-07-21 20:00:45,531 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-07-21 20:00:45,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:00:45,532 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-07-21 20:00:45,532 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 20:00:45,532 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-07-21 20:00:45,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 20:00:45,533 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:00:45,534 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:00:45,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:00:45,736 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:00:45,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:00:45,738 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-07-21 20:00:45,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:00:45,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1038490237] [2020-07-21 20:00:45,739 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 20:00:45,845 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:00:45,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:00:45,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 20:00:45,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:00:45,893 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 20:00:45,893 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:00:45,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1038490237] [2020-07-21 20:00:45,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:00:45,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 20:00:45,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859120831] [2020-07-21 20:00:45,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 20:00:45,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:00:45,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 20:00:45,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 20:00:45,903 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 3 states. [2020-07-21 20:00:45,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:00:45,935 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-07-21 20:00:45,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 20:00:45,937 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 20:00:45,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:00:45,939 INFO L225 Difference]: With dead ends: 34 [2020-07-21 20:00:45,939 INFO L226 Difference]: Without dead ends: 22 [2020-07-21 20:00:45,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 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 20:00:45,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-21 20:00:45,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-07-21 20:00:45,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 20:00:45,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-21 20:00:45,956 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-07-21 20:00:45,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:00:45,957 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-21 20:00:45,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 20:00:45,960 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-21 20:00:45,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 20:00:45,961 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:00:45,962 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:00:46,179 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:00:46,180 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:00:46,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:00:46,182 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-07-21 20:00:46,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:00:46,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1158963878] [2020-07-21 20:00:46,183 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 20:00:46,284 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:00:46,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:00:46,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 20:00:46,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:00:46,327 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 20:00:46,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:00:46,394 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 20:00:46,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1158963878] [2020-07-21 20:00:46,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:00:46,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 20:00:46,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730311616] [2020-07-21 20:00:46,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 20:00:46,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:00:46,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 20:00:46,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:00:46,399 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2020-07-21 20:00:46,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:00:46,472 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2020-07-21 20:00:46,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 20:00:46,473 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-07-21 20:00:46,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:00:46,475 INFO L225 Difference]: With dead ends: 39 [2020-07-21 20:00:46,476 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 20:00:46,477 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 35 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 20:00:46,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 20:00:46,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 20:00:46,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 20:00:46,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-21 20:00:46,493 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 20 [2020-07-21 20:00:46,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:00:46,494 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-21 20:00:46,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 20:00:46,494 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-21 20:00:46,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 20:00:46,496 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:00:46,497 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:00:46,711 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:00:46,712 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:00:46,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:00:46,713 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 2 times [2020-07-21 20:00:46,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:00:46,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [253456248] [2020-07-21 20:00:46,715 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 20:00:47,440 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:00:47,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:00:47,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 20:00:47,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:00:47,501 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 20:00:47,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:00:47,578 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 20:00:47,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [253456248] [2020-07-21 20:00:47,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:00:47,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 20:00:47,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638081834] [2020-07-21 20:00:47,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 20:00:47,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:00:47,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 20:00:47,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 20:00:47,581 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 12 states. [2020-07-21 20:00:47,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:00:47,658 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2020-07-21 20:00:47,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 20:00:47,659 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2020-07-21 20:00:47,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:00:47,660 INFO L225 Difference]: With dead ends: 51 [2020-07-21 20:00:47,660 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 20:00:47,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 20:00:47,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 20:00:47,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 20:00:47,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 20:00:47,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-21 20:00:47,669 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 26 [2020-07-21 20:00:47,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:00:47,669 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-21 20:00:47,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 20:00:47,670 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-21 20:00:47,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-21 20:00:47,671 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:00:47,671 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:00:47,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:00:47,885 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:00:47,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:00:47,886 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 3 times [2020-07-21 20:00:47,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:00:47,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [111115329] [2020-07-21 20:00:47,887 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 20:03:24,763 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:03:24,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:03:25,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 20:03:25,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:03:26,079 INFO L173 IndexEqualityManager]: detected equality via solver [2020-07-21 20:03:26,085 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-07-21 20:03:26,086 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 12 [2020-07-21 20:03:26,087 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-21 20:03:26,093 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-21 20:03:26,095 INFO L544 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-21 20:03:26,096 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:38, output treesize:5 [2020-07-21 20:03:26,107 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-21 20:03:26,108 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:03:26,108 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [111115329] [2020-07-21 20:03:26,108 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:03:26,108 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 20:03:26,109 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659821519] [2020-07-21 20:03:26,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 20:03:26,109 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:03:26,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 20:03:26,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 20:03:26,110 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 5 states. [2020-07-21 20:03:26,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:03:26,163 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-07-21 20:03:26,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 20:03:26,164 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-07-21 20:03:26,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:03:26,165 INFO L225 Difference]: With dead ends: 49 [2020-07-21 20:03:26,165 INFO L226 Difference]: Without dead ends: 41 [2020-07-21 20:03:26,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:03:26,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-07-21 20:03:26,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-07-21 20:03:26,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 20:03:26,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-07-21 20:03:26,172 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-07-21 20:03:26,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:03:26,173 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-07-21 20:03:26,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 20:03:26,173 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-07-21 20:03:26,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 20:03:26,174 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:03:26,174 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:03:26,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:03:26,376 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:03:26,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:03:26,377 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-07-21 20:03:26,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:03:26,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [369571394] [2020-07-21 20:03:26,378 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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