/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_7-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:23:56,817 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:23:56,819 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:23:56,845 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:23:56,846 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:23:56,848 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:23:56,851 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:23:56,857 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:23:56,864 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:23:56,866 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:23:56,867 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:23:56,869 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:23:56,870 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:23:56,871 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:23:56,875 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:23:56,876 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:23:56,877 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:23:56,880 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:23:56,882 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:23:56,889 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:23:56,893 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:23:56,895 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:23:56,896 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:23:56,897 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:23:56,904 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:23:56,919 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:23:56,920 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:23:56,923 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:23:56,925 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 13:23:56,941 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:23:56,942 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:23:56,943 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:23:56,943 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:23:56,944 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:23:56,944 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:23:56,944 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:23:56,944 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:23:56,945 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:23:56,945 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:23:56,945 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:23:56,945 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:23:56,946 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:23:56,946 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:23:56,946 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:23:56,946 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:23:56,946 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:23:56,947 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:23:56,947 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:23:56,947 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:23:56,947 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:23:56,948 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:23:56,948 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:23:56,948 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:23:56,948 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:23:56,949 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:23:56,949 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:56,949 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:23:56,949 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:23:56,949 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 13:23:57,367 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:23:57,391 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:23:57,395 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:23:57,396 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:23:57,397 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:23:57,397 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_7-2.c [2020-07-21 13:23:57,483 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20c3f1693/d359a47e0620444db511097aa7e5b610/FLAG5c356ae69 [2020-07-21 13:23:58,070 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:23:58,074 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_7-2.c [2020-07-21 13:23:58,089 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20c3f1693/d359a47e0620444db511097aa7e5b610/FLAG5c356ae69 [2020-07-21 13:23:58,336 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20c3f1693/d359a47e0620444db511097aa7e5b610 [2020-07-21 13:23:58,348 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:23:58,352 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:23:58,353 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:23:58,354 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:23:58,359 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:23:58,360 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,365 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@561ec46e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58, skipping insertion in model container [2020-07-21 13:23:58,365 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,375 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:23:58,397 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:23:58,578 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:23:58,585 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:23:58,600 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:23:58,617 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:23:58,617 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58 WrapperNode [2020-07-21 13:23:58,618 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:23:58,619 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:23:58,619 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:23:58,619 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:23:58,635 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,635 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,642 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,642 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,648 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,651 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,653 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,655 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:23:58,656 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:23:58,656 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:23:58,656 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:23:58,658 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (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 13:23:58,836 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:23:58,836 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:23:58,836 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 13:23:58,837 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:23:58,837 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:23:58,837 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:23:58,837 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 13:23:58,838 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:23:58,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:23:58,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:23:59,070 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:23:59,070 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:23:59,076 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:23:59 BoogieIcfgContainer [2020-07-21 13:23:59,076 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:23:59,078 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:23:59,078 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:23:59,083 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:23:59,083 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:23:58" (1/3) ... [2020-07-21 13:23:59,085 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2faaf6be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:23:59, skipping insertion in model container [2020-07-21 13:23:59,085 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (2/3) ... [2020-07-21 13:23:59,086 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2faaf6be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:23:59, skipping insertion in model container [2020-07-21 13:23:59,087 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:23:59" (3/3) ... [2020-07-21 13:23:59,089 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_7-2.c [2020-07-21 13:23:59,101 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:23:59,112 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:23:59,131 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:23:59,165 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:23:59,165 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:23:59,166 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:23:59,166 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:23:59,166 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:23:59,166 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:23:59,167 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:23:59,167 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:23:59,189 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 13:23:59,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:23:59,199 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:59,200 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:59,201 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:59,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:59,208 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 13:23:59,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:59,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [146271739] [2020-07-21 13:23:59,218 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 13:23:59,298 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:59,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:59,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:23:59,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:59,463 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 13:23:59,463 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:23:59,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [146271739] [2020-07-21 13:23:59,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:23:59,467 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:23:59,469 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479852137] [2020-07-21 13:23:59,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:23:59,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:59,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:23:59,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:23:59,515 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 13:23:59,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:59,665 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 13:23:59,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:23:59,668 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:23:59,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:59,683 INFO L225 Difference]: With dead ends: 35 [2020-07-21 13:23:59,684 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 13:23:59,688 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 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 13:23:59,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 13:23:59,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 13:23:59,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 13:23:59,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 13:23:59,752 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 13:23:59,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:59,753 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 13:23:59,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:23:59,754 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 13:23:59,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 13:23:59,756 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:59,757 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:59,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:59,971 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:59,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:59,972 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 13:23:59,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:59,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1487711206] [2020-07-21 13:23:59,974 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 13:24:00,013 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:00,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:00,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:24:00,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:00,055 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 13:24:00,055 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:24:00,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1487711206] [2020-07-21 13:24:00,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:24:00,056 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:24:00,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766299503] [2020-07-21 13:24:00,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:24:00,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:00,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:24:00,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:24:00,061 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 13:24:00,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:00,142 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 13:24:00,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:24:00,143 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 13:24:00,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:00,145 INFO L225 Difference]: With dead ends: 27 [2020-07-21 13:24:00,145 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 13:24:00,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 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 13:24:00,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 13:24:00,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 13:24:00,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 13:24:00,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 13:24:00,157 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 13:24:00,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:00,158 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 13:24:00,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:24:00,159 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 13:24:00,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:24:00,160 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:00,161 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:00,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:00,377 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:00,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:00,379 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 13:24:00,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:00,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [697380109] [2020-07-21 13:24:00,380 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 13:24:00,441 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:00,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:00,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:24:00,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:00,505 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 13:24:00,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:00,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:00,790 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 13:24:00,790 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [697380109] [2020-07-21 13:24:00,791 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:00,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 13:24:00,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342632610] [2020-07-21 13:24:00,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 13:24:00,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:00,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 13:24:00,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:24:00,794 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 13:24:00,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:00,958 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 13:24:00,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 13:24:00,959 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 13:24:00,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:00,961 INFO L225 Difference]: With dead ends: 32 [2020-07-21 13:24:00,961 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 13:24:00,963 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:24:00,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 13:24:00,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 13:24:00,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 13:24:00,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 13:24:00,974 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 13:24:00,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:00,974 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 13:24:00,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 13:24:00,975 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 13:24:00,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:24:00,977 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:00,977 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:01,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:01,193 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:01,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:01,194 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 13:24:01,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:01,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1181385711] [2020-07-21 13:24:01,195 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 13:24:01,231 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:01,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:01,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:24:01,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:01,275 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 13:24:01,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:01,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:01,471 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 13:24:01,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1181385711] [2020-07-21 13:24:01,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:01,472 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 13:24:01,472 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741503270] [2020-07-21 13:24:01,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 13:24:01,473 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:01,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 13:24:01,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:24:01,474 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 13:24:01,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:01,600 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 13:24:01,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 13:24:01,601 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 13:24:01,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:01,604 INFO L225 Difference]: With dead ends: 37 [2020-07-21 13:24:01,604 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 13:24:01,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:24:01,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 13:24:01,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 13:24:01,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 13:24:01,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 13:24:01,618 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 13:24:01,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:01,618 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 13:24:01,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 13:24:01,619 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 13:24:01,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 13:24:01,621 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:01,621 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:01,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:01,836 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:01,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:01,837 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 13:24:01,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:01,838 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [390184104] [2020-07-21 13:24:01,839 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 13:24:01,893 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:01,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:01,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:24:01,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:01,953 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 13:24:01,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:02,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:02,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:02,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:02,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:02,415 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 13:24:02,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [390184104] [2020-07-21 13:24:02,416 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:02,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 13:24:02,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138676039] [2020-07-21 13:24:02,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 13:24:02,418 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:02,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 13:24:02,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:24:02,419 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 13:24:02,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:02,605 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 13:24:02,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:24:02,606 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 13:24:02,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:02,608 INFO L225 Difference]: With dead ends: 42 [2020-07-21 13:24:02,608 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 13:24:02,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:24:02,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 13:24:02,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 13:24:02,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 13:24:02,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 13:24:02,621 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 13:24:02,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:02,622 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 13:24:02,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 13:24:02,622 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 13:24:02,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 13:24:02,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:02,624 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:02,829 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:02,829 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:02,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:02,830 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 13:24:02,831 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:02,831 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [111827631] [2020-07-21 13:24:02,832 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 [2020-07-21 13:24:02,883 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:02,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:02,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:24:02,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:02,968 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 13:24:02,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:03,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:03,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:03,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:03,345 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 13:24:03,346 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [111827631] [2020-07-21 13:24:03,346 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:03,346 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 13:24:03,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750436301] [2020-07-21 13:24:03,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 13:24:03,347 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:03,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 13:24:03,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:24:03,348 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 13:24:03,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:03,507 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 13:24:03,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:24:03,508 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 13:24:03,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:03,511 INFO L225 Difference]: With dead ends: 47 [2020-07-21 13:24:03,512 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 13:24:03,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:24:03,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 13:24:03,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 13:24:03,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 13:24:03,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 13:24:03,529 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 13:24:03,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:03,530 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 13:24:03,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 13:24:03,530 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 13:24:03,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 13:24:03,533 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:03,533 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:03,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:03,739 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:03,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:03,740 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 13:24:03,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:03,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1920830741] [2020-07-21 13:24:03,741 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 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 13:24:03,790 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:03,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:03,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:24:03,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:03,872 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 13:24:03,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:04,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:04,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:04,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:04,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:04,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:04,578 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 13:24:04,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1920830741] [2020-07-21 13:24:04,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:04,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 13:24:04,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637134572] [2020-07-21 13:24:04,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:24:04,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:04,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:24:04,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:24:04,581 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 13:24:04,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:04,824 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 13:24:04,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:24:04,825 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 13:24:04,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:04,828 INFO L225 Difference]: With dead ends: 52 [2020-07-21 13:24:04,833 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 13:24:04,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:24:04,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 13:24:04,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 13:24:04,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:24:04,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 13:24:04,866 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 13:24:04,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:04,870 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 13:24:04,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:24:04,870 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 13:24:04,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 13:24:04,881 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:04,881 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:05,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:05,096 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:05,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:05,097 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 13:24:05,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:05,098 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762044834] [2020-07-21 13:24:05,098 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 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 13:24:05,174 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:05,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:05,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:24:05,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:05,264 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 13:24:05,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:05,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:05,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:05,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:05,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:06,046 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 13:24:06,048 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762044834] [2020-07-21 13:24:06,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:06,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 13:24:06,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869796982] [2020-07-21 13:24:06,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:24:06,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:06,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:24:06,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:24:06,053 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 13:24:06,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:06,230 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 13:24:06,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:24:06,235 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 13:24:06,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:06,238 INFO L225 Difference]: With dead ends: 57 [2020-07-21 13:24:06,240 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 13:24:06,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:24:06,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 13:24:06,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 13:24:06,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:24:06,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 13:24:06,277 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 13:24:06,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:06,279 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 13:24:06,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:24:06,281 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 13:24:06,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 13:24:06,286 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:06,286 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:06,502 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:06,502 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:06,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:06,504 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 13:24:06,504 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:06,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1116237427] [2020-07-21 13:24:06,505 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 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 [2020-07-21 13:24:06,576 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:06,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:06,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:24:06,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:06,683 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 13:24:06,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:07,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:07,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:07,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:07,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:07,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:07,659 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 13:24:07,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1116237427] [2020-07-21 13:24:07,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:07,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 13:24:07,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932592268] [2020-07-21 13:24:07,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:24:07,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:07,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:24:07,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:24:07,662 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 13:24:07,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:07,930 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 13:24:07,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:24:07,931 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 13:24:07,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:07,934 INFO L225 Difference]: With dead ends: 62 [2020-07-21 13:24:07,934 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 13:24:07,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:24:07,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 13:24:07,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 13:24:07,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 13:24:07,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 13:24:07,959 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 13:24:07,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:07,960 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 13:24:07,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:24:07,960 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 13:24:07,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 13:24:07,965 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:07,965 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:08,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:08,181 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:08,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:08,182 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 13:24:08,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:08,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596252932] [2020-07-21 13:24:08,183 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:08,272 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:08,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:08,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:24:08,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:08,353 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 13:24:08,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:09,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:09,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:09,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:09,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:09,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:09,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:09,485 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 13:24:09,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596252932] [2020-07-21 13:24:09,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:09,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 13:24:09,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401272293] [2020-07-21 13:24:09,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:24:09,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:09,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:24:09,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:24:09,490 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 13:24:09,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:09,679 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 13:24:09,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:24:09,680 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 13:24:09,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:09,685 INFO L225 Difference]: With dead ends: 67 [2020-07-21 13:24:09,686 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 13:24:09,688 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:24:09,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 13:24:09,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 13:24:09,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 13:24:09,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 13:24:09,708 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 13:24:09,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:09,709 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 13:24:09,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:24:09,709 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 13:24:09,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 13:24:09,715 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:09,716 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:09,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:09,933 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:09,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:09,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 13:24:09,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:09,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2095707104] [2020-07-21 13:24:09,934 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:10,061 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:10,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:10,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:24:10,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:10,171 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 13:24:10,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:11,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:11,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:11,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:11,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:11,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:11,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:12,054 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 13:24:12,054 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2095707104] [2020-07-21 13:24:12,054 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:12,054 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 13:24:12,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337482033] [2020-07-21 13:24:12,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:24:12,055 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:12,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:24:12,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:24:12,056 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 13:24:12,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:12,279 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 13:24:12,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:24:12,280 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 13:24:12,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:12,284 INFO L225 Difference]: With dead ends: 72 [2020-07-21 13:24:12,284 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 13:24:12,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:24:12,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 13:24:12,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 13:24:12,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 13:24:12,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 13:24:12,296 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 13:24:12,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:12,297 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 13:24:12,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:24:12,297 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 13:24:12,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 13:24:12,302 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:12,302 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:12,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:12,517 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:12,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:12,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-21 13:24:12,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:12,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568092314] [2020-07-21 13:24:12,519 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 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:12,674 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:12,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:12,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 666 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:24:12,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:12,842 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-21 13:24:12,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:14,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:14,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:14,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:14,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:14,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:14,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:14,727 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-21 13:24:14,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568092314] [2020-07-21 13:24:14,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:14,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 16 [2020-07-21 13:24:14,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194389588] [2020-07-21 13:24:14,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:24:14,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:14,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:24:14,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:24:14,730 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 16 states. [2020-07-21 13:24:14,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:14,955 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 13:24:14,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:24:14,955 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 299 [2020-07-21 13:24:14,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:14,962 INFO L225 Difference]: With dead ends: 77 [2020-07-21 13:24:14,962 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 13:24:14,965 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2020-07-21 13:24:14,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 13:24:14,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 13:24:14,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 13:24:14,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 13:24:14,989 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-21 13:24:14,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:14,990 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 13:24:14,990 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:24:14,991 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 13:24:14,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 13:24:14,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:14,997 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:15,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:15,212 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:15,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:15,213 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-21 13:24:15,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:15,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1423606556] [2020-07-21 13:24:15,214 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:15,432 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:15,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:15,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 1133 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:24:15,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:15,647 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-21 13:24:15,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:17,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:18,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:18,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:18,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:18,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:18,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:18,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:18,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:18,954 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-21 13:24:18,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1423606556] [2020-07-21 13:24:18,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:18,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 13:24:18,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547340168] [2020-07-21 13:24:18,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:24:18,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:18,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:24:18,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:24:18,956 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 18 states. [2020-07-21 13:24:19,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:19,433 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 13:24:19,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:24:19,433 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 507 [2020-07-21 13:24:19,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:19,438 INFO L225 Difference]: With dead ends: 82 [2020-07-21 13:24:19,438 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 13:24:19,439 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:24:19,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 13:24:19,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 13:24:19,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 13:24:19,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 13:24:19,451 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-21 13:24:19,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:19,452 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 13:24:19,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:24:19,452 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 13:24:19,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 13:24:19,456 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:19,456 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:19,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:19,671 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:19,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:19,672 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 13:24:19,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:19,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1339057897] [2020-07-21 13:24:19,673 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:19,881 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:19,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:19,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 1001 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:24:19,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:20,103 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 648 proven. 1709 refuted. 0 times theorem prover too weak. 9325 trivial. 0 not checked. [2020-07-21 13:24:20,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:21,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:21,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:22,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:22,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:22,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:22,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:22,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:22,931 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:22,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:23,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:23,225 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 652 proven. 1756 refuted. 0 times theorem prover too weak. 9274 trivial. 0 not checked. [2020-07-21 13:24:23,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1339057897] [2020-07-21 13:24:23,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:23,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 13:24:23,226 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721111623] [2020-07-21 13:24:23,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:24:23,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:23,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:24:23,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:24:23,227 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 18 states. [2020-07-21 13:24:23,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:23,528 INFO L93 Difference]: Finished difference Result 147 states and 749 transitions. [2020-07-21 13:24:23,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:24:23,529 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 450 [2020-07-21 13:24:23,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:23,531 INFO L225 Difference]: With dead ends: 147 [2020-07-21 13:24:23,531 INFO L226 Difference]: Without dead ends: 70 [2020-07-21 13:24:23,537 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:24:23,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-21 13:24:23,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-07-21 13:24:23,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 13:24:23,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 122 transitions. [2020-07-21 13:24:23,563 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 122 transitions. Word has length 450 [2020-07-21 13:24:23,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:23,564 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 122 transitions. [2020-07-21 13:24:23,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:24:23,564 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 122 transitions. [2020-07-21 13:24:23,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-21 13:24:23,568 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:23,568 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 38, 23, 23, 23, 23, 23, 23, 23, 15, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:23,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:23,783 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:23,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:23,784 INFO L82 PathProgramCache]: Analyzing trace with hash -530192014, now seen corresponding path program 7 times [2020-07-21 13:24:23,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:23,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [370229613] [2020-07-21 13:24:23,785 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:24,067 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:24,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:24,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:24:24,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:24,211 INFO L134 CoverageAnalysis]: Checked inductivity of 6039 backedges. 1091 proven. 461 refuted. 0 times theorem prover too weak. 4487 trivial. 0 not checked. [2020-07-21 13:24:24,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:25,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:25,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:25,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:26,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:26,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:26,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:26,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:26,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:26,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:26,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:26,908 INFO L134 CoverageAnalysis]: Checked inductivity of 6039 backedges. 1091 proven. 518 refuted. 0 times theorem prover too weak. 4430 trivial. 0 not checked. [2020-07-21 13:24:26,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [370229613] [2020-07-21 13:24:26,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:26,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 13:24:26,909 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446708155] [2020-07-21 13:24:26,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:24:26,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:26,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:24:26,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:24:26,911 INFO L87 Difference]: Start difference. First operand 70 states and 122 transitions. Second operand 18 states. [2020-07-21 13:24:27,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:27,162 INFO L93 Difference]: Finished difference Result 120 states and 219 transitions. [2020-07-21 13:24:27,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:24:27,163 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 327 [2020-07-21 13:24:27,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:27,166 INFO L225 Difference]: With dead ends: 120 [2020-07-21 13:24:27,166 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 13:24:27,169 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 660 GetRequests, 622 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:24:27,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 13:24:27,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 90. [2020-07-21 13:24:27,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-21 13:24:27,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 167 transitions. [2020-07-21 13:24:27,183 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 167 transitions. Word has length 327 [2020-07-21 13:24:27,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:27,184 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 167 transitions. [2020-07-21 13:24:27,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:24:27,184 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 167 transitions. [2020-07-21 13:24:27,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-21 13:24:27,188 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:27,189 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 34, 20, 20, 20, 20, 20, 20, 20, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:27,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:27,404 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:27,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:27,405 INFO L82 PathProgramCache]: Analyzing trace with hash -301446619, now seen corresponding path program 8 times [2020-07-21 13:24:27,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:27,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269878941] [2020-07-21 13:24:27,406 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:27,591 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:27,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:27,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:24:27,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:27,710 INFO L134 CoverageAnalysis]: Checked inductivity of 4601 backedges. 494 proven. 479 refuted. 0 times theorem prover too weak. 3628 trivial. 0 not checked. [2020-07-21 13:24:27,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:28,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:29,091 INFO L134 CoverageAnalysis]: Checked inductivity of 4601 backedges. 500 proven. 505 refuted. 0 times theorem prover too weak. 3596 trivial. 0 not checked. [2020-07-21 13:24:29,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269878941] [2020-07-21 13:24:29,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:29,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 13:24:29,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015237731] [2020-07-21 13:24:29,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:24:29,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:29,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:24:29,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:24:29,094 INFO L87 Difference]: Start difference. First operand 90 states and 167 transitions. Second operand 14 states. [2020-07-21 13:24:29,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:29,274 INFO L93 Difference]: Finished difference Result 135 states and 267 transitions. [2020-07-21 13:24:29,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:24:29,275 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 287 [2020-07-21 13:24:29,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:29,278 INFO L225 Difference]: With dead ends: 135 [2020-07-21 13:24:29,278 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 13:24:29,281 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 550 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:24:29,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 13:24:29,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 93. [2020-07-21 13:24:29,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 13:24:29,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 181 transitions. [2020-07-21 13:24:29,302 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 181 transitions. Word has length 287 [2020-07-21 13:24:29,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:29,303 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 181 transitions. [2020-07-21 13:24:29,303 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:24:29,303 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 181 transitions. [2020-07-21 13:24:29,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 13:24:29,307 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:29,307 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:29,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:29,522 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:29,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:29,523 INFO L82 PathProgramCache]: Analyzing trace with hash 1320340794, now seen corresponding path program 9 times [2020-07-21 13:24:29,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:29,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1012405827] [2020-07-21 13:24:29,524 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:29,728 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:29,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:29,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 666 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:24:29,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:29,882 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 369 proven. 1023 refuted. 0 times theorem prover too weak. 3621 trivial. 0 not checked. [2020-07-21 13:24:29,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:31,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:31,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:31,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:31,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:32,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:32,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:32,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:32,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:32,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:32,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:32,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:32,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:32,603 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 375 proven. 1074 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2020-07-21 13:24:32,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1012405827] [2020-07-21 13:24:32,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:32,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 13:24:32,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583452754] [2020-07-21 13:24:32,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:24:32,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:32,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:24:32,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:24:32,606 INFO L87 Difference]: Start difference. First operand 93 states and 181 transitions. Second operand 18 states. [2020-07-21 13:24:33,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:33,004 INFO L93 Difference]: Finished difference Result 183 states and 362 transitions. [2020-07-21 13:24:33,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:24:33,005 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 299 [2020-07-21 13:24:33,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:33,008 INFO L225 Difference]: With dead ends: 183 [2020-07-21 13:24:33,009 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 13:24:33,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 604 GetRequests, 566 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:24:33,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 13:24:33,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 87. [2020-07-21 13:24:33,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-07-21 13:24:33,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 126 transitions. [2020-07-21 13:24:33,033 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 126 transitions. Word has length 299 [2020-07-21 13:24:33,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:33,036 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 126 transitions. [2020-07-21 13:24:33,036 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:24:33,036 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 126 transitions. [2020-07-21 13:24:33,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 13:24:33,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:33,042 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 33, 20, 20, 20, 20, 20, 20, 20, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:33,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:33,256 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:33,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:33,256 INFO L82 PathProgramCache]: Analyzing trace with hash -1425621089, now seen corresponding path program 10 times [2020-07-21 13:24:33,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:33,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2055696019] [2020-07-21 13:24:33,257 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:33,473 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:33,474 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 13:24:33,474 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 13:24:33,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 13:24:33,532 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 13:24:33,628 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 13:24:33,629 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 13:24:33,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:33,920 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:24:33 BoogieIcfgContainer [2020-07-21 13:24:33,920 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:24:33,923 INFO L168 Benchmark]: Toolchain (without parser) took 35572.65 ms. Allocated memory was 137.9 MB in the beginning and 683.1 MB in the end (delta: 545.3 MB). Free memory was 103.2 MB in the beginning and 426.2 MB in the end (delta: -323.0 MB). Peak memory consumption was 222.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:33,924 INFO L168 Benchmark]: CDTParser took 0.75 ms. Allocated memory is still 137.9 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 13:24:33,924 INFO L168 Benchmark]: CACSL2BoogieTranslator took 265.04 ms. Allocated memory is still 137.9 MB. Free memory was 102.8 MB in the beginning and 93.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:33,925 INFO L168 Benchmark]: Boogie Preprocessor took 36.27 ms. Allocated memory is still 137.9 MB. Free memory was 93.5 MB in the beginning and 92.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:33,925 INFO L168 Benchmark]: RCFGBuilder took 420.75 ms. Allocated memory was 137.9 MB in the beginning and 203.4 MB in the end (delta: 65.5 MB). Free memory was 92.2 MB in the beginning and 171.6 MB in the end (delta: -79.4 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:33,926 INFO L168 Benchmark]: TraceAbstraction took 34842.11 ms. Allocated memory was 203.4 MB in the beginning and 683.1 MB in the end (delta: 479.7 MB). Free memory was 170.9 MB in the beginning and 426.2 MB in the end (delta: -255.3 MB). Peak memory consumption was 224.4 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:33,929 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.75 ms. Allocated memory is still 137.9 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 265.04 ms. Allocated memory is still 137.9 MB. Free memory was 102.8 MB in the beginning and 93.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 36.27 ms. Allocated memory is still 137.9 MB. Free memory was 93.5 MB in the beginning and 92.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 420.75 ms. Allocated memory was 137.9 MB in the beginning and 203.4 MB in the end (delta: 65.5 MB). Free memory was 92.2 MB in the beginning and 171.6 MB in the end (delta: -79.4 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 34842.11 ms. Allocated memory was 203.4 MB in the beginning and 683.1 MB in the end (delta: 479.7 MB). Free memory was 170.9 MB in the beginning and 426.2 MB in the end (delta: -255.3 MB). Peak memory consumption was 224.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 27]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L24] int x = 7; VAL [x=7] [L25] CALL, EXPR fibo(x) VAL [\old(n)=7] [L6] COND FALSE !(n < 1) VAL [\old(n)=7, n=7] [L8] COND FALSE !(n == 1) VAL [\old(n)=7, n=7] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=6] [L6] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L8] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=5] [L6] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L8] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L6] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L8] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=5, fibo(n-1)=3, n=5] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=6, fibo(n-1)=5, n=6] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=4] [L6] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L8] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=6, fibo(n-1)=5, fibo(n-2)=3, n=6] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=7, fibo(n-1)=8, n=7] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=5] [L6] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L8] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L6] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L8] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=5, fibo(n-1)=3, n=5] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=7, fibo(n-1)=8, fibo(n-2)=5, n=7] [L11] return fibo(n-1) + fibo(n-2); [L25] RET, EXPR fibo(x) VAL [fibo(x)=13, x=7] [L25] int result = fibo(x); [L26] COND TRUE result == 13 VAL [result=13, x=7] [L27] __VERIFIER_error() VAL [result=13, x=7] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 34.6s, OverallIterations: 18, TraceHistogramMax: 77, AutomataDifference: 3.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 334 SDtfs, 671 SDslu, 1316 SDs, 0 SdLazy, 1624 SolverSat, 1092 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 6208 GetRequests, 5790 SyntacticMatches, 152 SemanticMatches, 266 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1019 ImplicationChecksByTransitivity, 3.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=93occurred in iteration=16, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 17 MinimizatonAttempts, 228 StatesRemovedByMinimization, 15 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 1.0s SatisfiabilityAnalysisTime, 23.8s InterpolantComputationTime, 3369 NumberOfCodeBlocks, 3369 NumberOfCodeBlocksAsserted, 36 NumberOfCheckSat, 6107 ConstructedInterpolants, 0 QuantifiedInterpolants, 2719849 SizeOfPredicates, 92 NumberOfNonLiveVariables, 6890 ConjunctsInSsa, 184 ConjunctsInUnsatCore, 32 InterpolantComputations, 2 PerfectInterpolantSequences, 92979/111120 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...