/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:53:39,653 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:53:39,658 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:53:39,693 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:53:39,694 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:53:39,698 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:53:39,701 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:53:39,715 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:53:39,719 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:53:39,720 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:53:39,722 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:53:39,723 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:53:39,724 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:53:39,725 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:53:39,727 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:53:39,729 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:53:39,731 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:53:39,732 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:53:39,735 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:53:39,738 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:53:39,740 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:53:39,742 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:53:39,744 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:53:39,746 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:53:39,750 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:53:39,763 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:53:39,765 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:53:39,766 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:53:39,768 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:53:39,788 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:53:39,789 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:53:39,791 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:53:39,792 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:53:39,792 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:53:39,792 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:53:39,793 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:53:39,793 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:53:39,793 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:53:39,793 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:53:39,794 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:53:39,794 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:53:39,794 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:53:39,794 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:53:39,794 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:53:39,795 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:53:39,795 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:53:39,795 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:53:39,795 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:53:39,795 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:53:39,796 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:53:39,796 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:53:39,796 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:53:39,796 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:53:39,797 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:53:39,797 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:53:39,797 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:39,797 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:53:39,797 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:53:39,798 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:53:40,297 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:53:40,318 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:53:40,323 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:53:40,326 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:53:40,327 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:53:40,328 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-07-20 16:53:40,435 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36b13c239/f7737116c15844bf9f78349e470fe089/FLAG970d22132 [2020-07-20 16:53:41,211 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:53:41,214 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-07-20 16:53:41,229 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36b13c239/f7737116c15844bf9f78349e470fe089/FLAG970d22132 [2020-07-20 16:53:41,517 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36b13c239/f7737116c15844bf9f78349e470fe089 [2020-07-20 16:53:41,538 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:53:41,545 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:53:41,547 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:53:41,547 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:53:41,554 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:53:41,557 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:53:41" (1/1) ... [2020-07-20 16:53:41,563 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f9a1b7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41, skipping insertion in model container [2020-07-20 16:53:41,564 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:53:41" (1/1) ... [2020-07-20 16:53:41,579 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:53:41,612 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:53:41,921 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:53:41,931 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:53:41,959 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:53:41,987 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:53:41,988 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41 WrapperNode [2020-07-20 16:53:41,988 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:53:41,990 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:53:41,991 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:53:41,991 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:53:42,018 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ... [2020-07-20 16:53:42,019 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ... [2020-07-20 16:53:42,029 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ... [2020-07-20 16:53:42,030 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ... [2020-07-20 16:53:42,167 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ... [2020-07-20 16:53:42,174 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ... [2020-07-20 16:53:42,183 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ... [2020-07-20 16:53:42,193 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:53:42,195 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:53:42,195 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:53:42,196 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:53:42,199 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:53:42,317 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:53:42,317 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:53:42,317 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 16:53:42,318 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 16:53:42,318 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:53:42,318 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:53:42,319 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:53:42,319 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 16:53:42,319 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 16:53:42,319 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:53:42,319 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:53:42,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:53:42,655 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:53:42,655 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:53:42,664 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:53:42 BoogieIcfgContainer [2020-07-20 16:53:42,665 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:53:42,667 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:53:42,667 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:53:42,673 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:53:42,674 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:53:41" (1/3) ... [2020-07-20 16:53:42,676 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@795651fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:53:42, skipping insertion in model container [2020-07-20 16:53:42,676 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (2/3) ... [2020-07-20 16:53:42,677 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@795651fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:53:42, skipping insertion in model container [2020-07-20 16:53:42,677 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:53:42" (3/3) ... [2020-07-20 16:53:42,681 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-2.c [2020-07-20 16:53:42,724 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:53:42,775 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:53:42,819 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:53:42,870 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:53:42,871 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:53:42,871 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:53:42,871 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:53:42,871 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:53:42,871 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:53:42,872 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:53:42,872 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:53:42,906 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 16:53:42,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:53:42,918 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:42,926 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:42,931 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:42,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:42,946 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 16:53:42,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:42,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [7565219] [2020-07-20 16:53:42,961 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:43,072 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:43,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:43,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:53:43,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:43,221 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:53:43,222 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:53:43,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [7565219] [2020-07-20 16:53:43,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:53:43,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:53:43,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636494916] [2020-07-20 16:53:43,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:53:43,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:43,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:53:43,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:53:43,266 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 16:53:43,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:43,480 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 16:53:43,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:53:43,486 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:53:43,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:43,513 INFO L225 Difference]: With dead ends: 44 [2020-07-20 16:53:43,514 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:53:43,520 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 [2020-07-20 16:53:43,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:53:43,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 16:53:43,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:53:43,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:53:43,602 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 16:53:43,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:43,604 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:53:43,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:53:43,605 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:53:43,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:53:43,608 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:43,608 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:43,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:43,823 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:43,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:43,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 16:53:43,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:43,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1999469130] [2020-07-20 16:53:43,826 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:43,872 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:43,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:43,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:53:43,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:43,952 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:53:43,958 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:53:43,959 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1999469130] [2020-07-20 16:53:43,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:53:43,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:53:43,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785981007] [2020-07-20 16:53:43,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:53:43,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:43,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:53:43,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:53:43,972 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 16:53:44,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:44,140 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 16:53:44,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:53:44,141 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:53:44,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:44,143 INFO L225 Difference]: With dead ends: 36 [2020-07-20 16:53:44,144 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 16:53:44,146 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 [2020-07-20 16:53:44,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 16:53:44,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 16:53:44,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:53:44,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:53:44,160 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 16:53:44,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:44,161 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:53:44,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:53:44,161 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:53:44,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:53:44,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:44,164 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:44,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:44,373 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:44,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:44,375 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 16:53:44,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:44,376 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018507024] [2020-07-20 16:53:44,377 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:44,424 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:44,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:44,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:53:44,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:44,596 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:53:44,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:44,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:44,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:45,104 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:53:45,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018507024] [2020-07-20 16:53:45,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:45,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:53:45,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979530970] [2020-07-20 16:53:45,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:53:45,109 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:45,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:53:45,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:53:45,111 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 16:53:45,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:45,377 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 16:53:45,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:53:45,380 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 16:53:45,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:45,393 INFO L225 Difference]: With dead ends: 41 [2020-07-20 16:53:45,395 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 16:53:45,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:53:45,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 16:53:45,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 16:53:45,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:53:45,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:53:45,445 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 16:53:45,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:45,446 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:53:45,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:53:45,447 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:53:45,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:53:45,456 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:45,458 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:45,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:45,673 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:45,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:45,674 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 16:53:45,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:45,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [746931291] [2020-07-20 16:53:45,677 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:45,773 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:45,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:45,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:53:45,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:45,843 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:53:45,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:46,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:46,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:46,121 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:53:46,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [746931291] [2020-07-20 16:53:46,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:46,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:53:46,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943544578] [2020-07-20 16:53:46,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:53:46,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:46,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:53:46,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:53:46,126 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 16:53:46,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:46,323 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 16:53:46,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:53:46,324 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 16:53:46,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:46,327 INFO L225 Difference]: With dead ends: 46 [2020-07-20 16:53:46,328 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 16:53:46,329 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:53:46,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 16:53:46,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 16:53:46,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:53:46,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:53:46,342 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 16:53:46,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:46,343 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:53:46,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:53:46,344 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:53:46,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:53:46,346 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:46,346 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:46,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:46,561 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:46,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:46,562 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 16:53:46,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:46,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2039289771] [2020-07-20 16:53:46,563 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:46,616 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:46,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:46,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:53:46,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:46,728 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:53:46,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:47,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:47,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:47,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:47,277 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:53:47,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2039289771] [2020-07-20 16:53:47,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:47,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:53:47,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759290753] [2020-07-20 16:53:47,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:53:47,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:47,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:53:47,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:53:47,282 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 16:53:47,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:47,547 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 16:53:47,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:53:47,550 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 16:53:47,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:47,553 INFO L225 Difference]: With dead ends: 51 [2020-07-20 16:53:47,554 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 16:53:47,555 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:53:47,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 16:53:47,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 16:53:47,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 16:53:47,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 16:53:47,570 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 16:53:47,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:47,571 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 16:53:47,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:53:47,571 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 16:53:47,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 16:53:47,574 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:47,574 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:47,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:47,794 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:47,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:47,795 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 16:53:47,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:47,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1352427261] [2020-07-20 16:53:47,797 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:47,839 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:47,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:47,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:53:47,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:47,931 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:53:47,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:48,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:48,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:48,372 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:53:48,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1352427261] [2020-07-20 16:53:48,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:48,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:53:48,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767351447] [2020-07-20 16:53:48,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:53:48,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:48,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:53:48,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:53:48,377 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 16:53:48,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:48,818 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-20 16:53:48,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:53:48,820 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 16:53:48,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:48,832 INFO L225 Difference]: With dead ends: 84 [2020-07-20 16:53:48,832 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 16:53:48,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:53:48,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 16:53:48,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-20 16:53:48,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 16:53:48,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-20 16:53:48,865 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-20 16:53:48,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:48,866 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-20 16:53:48,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:53:48,867 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-20 16:53:48,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:53:48,871 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:48,872 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:49,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:49,088 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:49,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:49,089 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-20 16:53:49,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:49,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [428257912] [2020-07-20 16:53:49,092 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:49,169 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:49,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:49,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:53:49,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:49,248 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:53:49,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:49,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:49,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:49,712 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:53:49,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [428257912] [2020-07-20 16:53:49,713 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:49,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:53:49,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676597480] [2020-07-20 16:53:49,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:53:49,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:49,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:53:49,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:53:49,717 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-20 16:53:49,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:49,978 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-20 16:53:49,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:53:49,979 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-20 16:53:49,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:49,982 INFO L225 Difference]: With dead ends: 63 [2020-07-20 16:53:49,982 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 16:53:49,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:53:49,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 16:53:49,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-20 16:53:49,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 16:53:50,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-20 16:53:50,001 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-20 16:53:50,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:50,002 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-20 16:53:50,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:53:50,002 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-20 16:53:50,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 16:53:50,011 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:50,011 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:50,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:50,213 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:50,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:50,214 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-20 16:53:50,215 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:50,215 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1720468135] [2020-07-20 16:53:50,215 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:50,271 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:50,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:50,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:53:50,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:50,389 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:53:50,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:50,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:50,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:50,754 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:53:50,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1720468135] [2020-07-20 16:53:50,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:50,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:53:50,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22649805] [2020-07-20 16:53:50,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:53:50,758 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:50,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:53:50,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:53:50,759 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-20 16:53:50,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:50,949 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-20 16:53:50,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:53:50,950 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-20 16:53:50,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:50,953 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:53:50,953 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:53:50,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:53:50,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:53:50,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-20 16:53:50,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 16:53:50,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-20 16:53:50,973 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-20 16:53:50,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:50,974 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-20 16:53:50,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:53:50,974 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-20 16:53:50,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 16:53:50,978 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:50,979 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:51,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:51,195 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:51,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:51,196 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-20 16:53:51,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:51,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [380169843] [2020-07-20 16:53:51,198 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:51,265 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:51,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:51,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:53:51,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:51,372 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 16:53:51,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:51,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:51,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:51,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:51,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:51,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:51,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:52,055 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-20 16:53:52,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [380169843] [2020-07-20 16:53:52,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:52,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:53:52,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678227588] [2020-07-20 16:53:52,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:53:52,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:52,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:53:52,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:53:52,059 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-20 16:53:52,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:52,305 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-20 16:53:52,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:53:52,306 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-20 16:53:52,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:52,309 INFO L225 Difference]: With dead ends: 75 [2020-07-20 16:53:52,309 INFO L226 Difference]: Without dead ends: 71 [2020-07-20 16:53:52,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:53:52,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-20 16:53:52,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-20 16:53:52,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 16:53:52,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-20 16:53:52,325 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-20 16:53:52,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:52,326 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-20 16:53:52,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:53:52,327 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-20 16:53:52,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 16:53:52,330 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:52,330 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:52,543 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:52,545 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:52,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:52,546 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-20 16:53:52,546 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:52,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869925022] [2020-07-20 16:53:52,547 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:53:52,599 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:52,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:52,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:53:52,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:52,673 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 16:53:52,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:53,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:53,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:53,095 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:53:53,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869925022] [2020-07-20 16:53:53,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:53,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:53:53,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672967375] [2020-07-20 16:53:53,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:53:53,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:53,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:53:53,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:53:53,099 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-20 16:53:53,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:53,345 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-20 16:53:53,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:53:53,350 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-20 16:53:53,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:53,352 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:53:53,353 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:53:53,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:53:53,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:53:53,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-20 16:53:53,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:53:53,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-20 16:53:53,371 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-20 16:53:53,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:53,372 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-20 16:53:53,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:53:53,373 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-20 16:53:53,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:53:53,375 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:53,376 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:53,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:53,591 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:53,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:53,592 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-20 16:53:53,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:53,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [55472330] [2020-07-20 16:53:53,593 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:53:53,658 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:53,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:53,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:53:53,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:53,804 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 16:53:53,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:54,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:54,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:54,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:54,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:54,587 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-20 16:53:54,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [55472330] [2020-07-20 16:53:54,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:54,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:53:54,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560963926] [2020-07-20 16:53:54,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:53:54,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:54,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:53:54,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:53:54,591 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-20 16:53:55,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:55,166 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-20 16:53:55,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:53:55,167 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-20 16:53:55,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:55,170 INFO L225 Difference]: With dead ends: 131 [2020-07-20 16:53:55,172 INFO L226 Difference]: Without dead ends: 76 [2020-07-20 16:53:55,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:53:55,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-20 16:53:55,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-20 16:53:55,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-20 16:53:55,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-20 16:53:55,217 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-20 16:53:55,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:55,221 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-20 16:53:55,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:53:55,221 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-20 16:53:55,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-20 16:53:55,229 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:55,230 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:55,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:55,447 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:55,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:55,448 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-20 16:53:55,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:55,449 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1091138764] [2020-07-20 16:53:55,450 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:53:55,523 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:55,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:55,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:53:55,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:55,712 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 16:53:55,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:56,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:56,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:56,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:56,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:56,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:56,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:56,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:56,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:56,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:56,768 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-20 16:53:56,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1091138764] [2020-07-20 16:53:56,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:56,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:53:56,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397167978] [2020-07-20 16:53:56,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:53:56,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:56,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:53:56,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:53:56,772 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-20 16:53:58,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:58,001 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-20 16:53:58,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 16:53:58,003 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-20 16:53:58,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:58,011 INFO L225 Difference]: With dead ends: 186 [2020-07-20 16:53:58,012 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 16:53:58,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:53:58,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 16:53:58,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-20 16:53:58,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 16:53:58,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-20 16:53:58,089 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-20 16:53:58,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:58,091 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-20 16:53:58,091 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:53:58,091 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-20 16:53:58,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:53:58,094 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:58,094 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:58,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:58,310 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:58,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:58,311 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-20 16:53:58,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:58,312 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [273223694] [2020-07-20 16:53:58,312 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:53:58,387 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:58,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:58,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:53:58,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:58,489 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-20 16:53:58,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:58,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:58,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:58,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:59,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:59,089 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:53:59,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [273223694] [2020-07-20 16:53:59,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:59,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 16:53:59,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261541765] [2020-07-20 16:53:59,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:53:59,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:59,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:53:59,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:53:59,094 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 13 states. [2020-07-20 16:53:59,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:59,370 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-20 16:53:59,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:53:59,373 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 68 [2020-07-20 16:53:59,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:59,376 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:53:59,377 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 16:53:59,378 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:53:59,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 16:53:59,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-20 16:53:59,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-20 16:53:59,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-20 16:53:59,395 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-20 16:53:59,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:59,396 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-20 16:53:59,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:53:59,397 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-20 16:53:59,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-20 16:53:59,401 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:59,404 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:59,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:59,619 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:59,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:59,621 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-20 16:53:59,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:59,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [23083399] [2020-07-20 16:53:59,622 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:53:59,691 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:59,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:59,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:53:59,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:59,807 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-20 16:53:59,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:00,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:00,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:00,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:00,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:00,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:00,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:00,680 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-20 16:54:00,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [23083399] [2020-07-20 16:54:00,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:00,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-20 16:54:00,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108947901] [2020-07-20 16:54:00,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:54:00,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:00,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:54:00,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:54:00,685 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-20 16:54:01,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:01,278 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-20 16:54:01,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:54:01,284 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-20 16:54:01,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:01,287 INFO L225 Difference]: With dead ends: 269 [2020-07-20 16:54:01,287 INFO L226 Difference]: Without dead ends: 168 [2020-07-20 16:54:01,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:54:01,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-20 16:54:01,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-20 16:54:01,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 16:54:01,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-20 16:54:01,308 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-20 16:54:01,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:01,308 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-20 16:54:01,309 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:54:01,309 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-20 16:54:01,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-20 16:54:01,311 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:01,311 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:01,525 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:01,526 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:01,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:01,527 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-20 16:54:01,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:01,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1484294541] [2020-07-20 16:54:01,528 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:54:01,597 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:01,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:01,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:54:01,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:01,640 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-20 16:54:01,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:01,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:01,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:01,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:01,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:01,981 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-20 16:54:01,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1484294541] [2020-07-20 16:54:01,982 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:01,982 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 16:54:01,982 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816694258] [2020-07-20 16:54:01,983 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:54:01,983 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:01,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:54:01,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:54:01,984 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 11 states. [2020-07-20 16:54:02,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:02,131 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-20 16:54:02,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:54:02,132 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 80 [2020-07-20 16:54:02,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:02,135 INFO L225 Difference]: With dead ends: 167 [2020-07-20 16:54:02,135 INFO L226 Difference]: Without dead ends: 163 [2020-07-20 16:54:02,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:54:02,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-20 16:54:02,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-20 16:54:02,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-20 16:54:02,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-20 16:54:02,153 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-20 16:54:02,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:02,154 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-20 16:54:02,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:54:02,154 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-20 16:54:02,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:54:02,157 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:02,157 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:02,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:02,373 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:02,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:02,374 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-20 16:54:02,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:02,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916853384] [2020-07-20 16:54:02,375 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:54:02,446 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:02,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:02,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:54:02,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:02,557 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-20 16:54:02,558 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:03,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:03,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:03,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:03,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:03,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:03,955 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-20 16:54:03,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916853384] [2020-07-20 16:54:03,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:03,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:54:03,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608182928] [2020-07-20 16:54:03,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:54:03,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:03,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:54:03,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:54:03,967 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-20 16:54:04,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:04,644 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-20 16:54:04,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:54:04,645 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-20 16:54:04,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:04,652 INFO L225 Difference]: With dead ends: 369 [2020-07-20 16:54:04,653 INFO L226 Difference]: Without dead ends: 218 [2020-07-20 16:54:04,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:54:04,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-20 16:54:04,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-20 16:54:04,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 16:54:04,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-20 16:54:04,699 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-20 16:54:04,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:04,700 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-20 16:54:04,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:54:04,700 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-20 16:54:04,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-20 16:54:04,705 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:04,705 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:04,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:04,919 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:04,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:04,920 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-20 16:54:04,921 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:04,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [828206245] [2020-07-20 16:54:04,922 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:54:05,008 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:05,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:05,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:54:05,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:05,074 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-20 16:54:05,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:05,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:05,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:05,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:05,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:05,529 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-20 16:54:05,530 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [828206245] [2020-07-20 16:54:05,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:05,531 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 16:54:05,531 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537949621] [2020-07-20 16:54:05,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:54:05,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:05,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:54:05,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:54:05,541 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 11 states. [2020-07-20 16:54:05,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:05,725 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-20 16:54:05,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:54:05,726 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 92 [2020-07-20 16:54:05,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:05,730 INFO L225 Difference]: With dead ends: 191 [2020-07-20 16:54:05,730 INFO L226 Difference]: Without dead ends: 187 [2020-07-20 16:54:05,732 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 169 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:54:05,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-20 16:54:05,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-20 16:54:05,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 16:54:05,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-20 16:54:05,756 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-20 16:54:05,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:05,756 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-20 16:54:05,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:54:05,757 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-20 16:54:05,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-07-20 16:54:05,761 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:05,762 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:05,975 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:05,975 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:05,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:05,976 INFO L82 PathProgramCache]: Analyzing trace with hash -464279411, now seen corresponding path program 2 times [2020-07-20 16:54:05,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:05,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [751888612] [2020-07-20 16:54:05,978 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:54:06,070 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:06,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:06,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:54:06,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:06,269 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 70 proven. 124 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2020-07-20 16:54:06,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:07,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:07,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:07,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:07,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:07,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:07,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:07,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:07,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:07,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:07,841 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 70 proven. 130 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2020-07-20 16:54:07,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [751888612] [2020-07-20 16:54:07,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:07,843 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:54:07,843 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603176746] [2020-07-20 16:54:07,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:54:07,844 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:07,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:54:07,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:54:07,845 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 21 states. [2020-07-20 16:54:08,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:08,736 INFO L93 Difference]: Finished difference Result 399 states and 796 transitions. [2020-07-20 16:54:08,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 16:54:08,737 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 118 [2020-07-20 16:54:08,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:08,742 INFO L225 Difference]: With dead ends: 399 [2020-07-20 16:54:08,743 INFO L226 Difference]: Without dead ends: 226 [2020-07-20 16:54:08,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 206 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 16:54:08,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-20 16:54:08,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 192. [2020-07-20 16:54:08,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-20 16:54:08,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 334 transitions. [2020-07-20 16:54:08,773 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 334 transitions. Word has length 118 [2020-07-20 16:54:08,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:08,774 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 334 transitions. [2020-07-20 16:54:08,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:54:08,774 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 334 transitions. [2020-07-20 16:54:08,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 16:54:08,779 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:08,780 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:08,993 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:08,995 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:08,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:08,996 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-20 16:54:08,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:08,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [177322612] [2020-07-20 16:54:08,997 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:09,211 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:09,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:09,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:54:09,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:09,328 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-20 16:54:09,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:10,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:10,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:10,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:10,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:10,361 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:10,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:10,461 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-20 16:54:10,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [177322612] [2020-07-20 16:54:10,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:10,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 16:54:10,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484848401] [2020-07-20 16:54:10,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:54:10,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:10,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:54:10,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:54:10,464 INFO L87 Difference]: Start difference. First operand 192 states and 334 transitions. Second operand 15 states. [2020-07-20 16:54:10,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:10,696 INFO L93 Difference]: Finished difference Result 205 states and 355 transitions. [2020-07-20 16:54:10,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:54:10,697 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 16:54:10,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:10,704 INFO L225 Difference]: With dead ends: 205 [2020-07-20 16:54:10,704 INFO L226 Difference]: Without dead ends: 201 [2020-07-20 16:54:10,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 211 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:54:10,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-20 16:54:10,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 192. [2020-07-20 16:54:10,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-20 16:54:10,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 334 transitions. [2020-07-20 16:54:10,725 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 334 transitions. Word has length 117 [2020-07-20 16:54:10,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:10,726 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 334 transitions. [2020-07-20 16:54:10,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:54:10,726 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 334 transitions. [2020-07-20 16:54:10,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:54:10,730 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:10,730 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:10,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:10,946 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:10,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:10,947 INFO L82 PathProgramCache]: Analyzing trace with hash -650257977, now seen corresponding path program 5 times [2020-07-20 16:54:10,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:10,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771246713] [2020-07-20 16:54:10,948 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:11,060 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:11,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:11,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:54:11,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:11,191 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 210 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 16:54:11,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:12,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:12,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:12,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:12,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:12,685 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 51 proven. 126 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2020-07-20 16:54:12,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771246713] [2020-07-20 16:54:12,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:12,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:54:12,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287315453] [2020-07-20 16:54:12,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:54:12,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:12,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:54:12,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:54:12,692 INFO L87 Difference]: Start difference. First operand 192 states and 334 transitions. Second operand 17 states. [2020-07-20 16:54:13,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:13,273 INFO L93 Difference]: Finished difference Result 364 states and 644 transitions. [2020-07-20 16:54:13,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:54:13,278 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 120 [2020-07-20 16:54:13,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:13,284 INFO L225 Difference]: With dead ends: 364 [2020-07-20 16:54:13,284 INFO L226 Difference]: Without dead ends: 178 [2020-07-20 16:54:13,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 214 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:54:13,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-20 16:54:13,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 176. [2020-07-20 16:54:13,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 16:54:13,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 287 transitions. [2020-07-20 16:54:13,313 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 287 transitions. Word has length 120 [2020-07-20 16:54:13,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:13,314 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 287 transitions. [2020-07-20 16:54:13,314 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:54:13,314 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 287 transitions. [2020-07-20 16:54:13,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-20 16:54:13,319 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:13,319 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:13,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:13,534 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:13,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:13,535 INFO L82 PathProgramCache]: Analyzing trace with hash 495118725, now seen corresponding path program 6 times [2020-07-20 16:54:13,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:13,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1995563401] [2020-07-20 16:54:13,538 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:13,732 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:13,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:13,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:54:13,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:14,083 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 177 proven. 301 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2020-07-20 16:54:14,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:15,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:15,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:15,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:15,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:15,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:16,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:16,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:16,388 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 177 proven. 311 refuted. 0 times theorem prover too weak. 536 trivial. 0 not checked. [2020-07-20 16:54:16,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1995563401] [2020-07-20 16:54:16,389 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:16,390 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-20 16:54:16,390 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388418718] [2020-07-20 16:54:16,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:54:16,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:16,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:54:16,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:54:16,396 INFO L87 Difference]: Start difference. First operand 176 states and 287 transitions. Second operand 25 states. [2020-07-20 16:54:18,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:18,160 INFO L93 Difference]: Finished difference Result 428 states and 843 transitions. [2020-07-20 16:54:18,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 16:54:18,161 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 199 [2020-07-20 16:54:18,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:18,168 INFO L225 Difference]: With dead ends: 428 [2020-07-20 16:54:18,168 INFO L226 Difference]: Without dead ends: 256 [2020-07-20 16:54:18,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 360 SyntacticMatches, 15 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=358, Invalid=1804, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 16:54:18,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-20 16:54:18,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 219. [2020-07-20 16:54:18,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2020-07-20 16:54:18,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 386 transitions. [2020-07-20 16:54:18,209 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 386 transitions. Word has length 199 [2020-07-20 16:54:18,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:18,209 INFO L479 AbstractCegarLoop]: Abstraction has 219 states and 386 transitions. [2020-07-20 16:54:18,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:54:18,210 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 386 transitions. [2020-07-20 16:54:18,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:54:18,213 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:18,214 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:18,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:18,428 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:18,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:18,429 INFO L82 PathProgramCache]: Analyzing trace with hash -1245954009, now seen corresponding path program 7 times [2020-07-20 16:54:18,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:18,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1005242961] [2020-07-20 16:54:18,431 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:18,617 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:18,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:18,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:54:18,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:18,845 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 78 proven. 124 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2020-07-20 16:54:18,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:19,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:19,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:19,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:19,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:20,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:20,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:20,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:20,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:20,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:20,507 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 78 proven. 130 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked. [2020-07-20 16:54:20,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1005242961] [2020-07-20 16:54:20,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:20,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:54:20,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237903469] [2020-07-20 16:54:20,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:54:20,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:20,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:54:20,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:54:20,511 INFO L87 Difference]: Start difference. First operand 219 states and 386 transitions. Second operand 21 states. [2020-07-20 16:54:21,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:21,344 INFO L93 Difference]: Finished difference Result 423 states and 796 transitions. [2020-07-20 16:54:21,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 16:54:21,350 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-20 16:54:21,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:21,358 INFO L225 Difference]: With dead ends: 423 [2020-07-20 16:54:21,359 INFO L226 Difference]: Without dead ends: 208 [2020-07-20 16:54:21,367 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 211 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=186, Invalid=870, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:54:21,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-20 16:54:21,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 174. [2020-07-20 16:54:21,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-20 16:54:21,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 278 transitions. [2020-07-20 16:54:21,399 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 278 transitions. Word has length 120 [2020-07-20 16:54:21,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:21,400 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 278 transitions. [2020-07-20 16:54:21,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:54:21,401 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 278 transitions. [2020-07-20 16:54:21,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 16:54:21,406 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:21,407 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:21,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:21,623 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:21,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:21,624 INFO L82 PathProgramCache]: Analyzing trace with hash -77183713, now seen corresponding path program 8 times [2020-07-20 16:54:21,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:21,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1423962548] [2020-07-20 16:54:21,625 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:21,802 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:54:21,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:21,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-20 16:54:21,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:22,171 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 72 proven. 49 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-07-20 16:54:22,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:23,225 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 16:54:23,363 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 16:54:23,501 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 16:54:23,627 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 16:54:25,651 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 72 proven. 49 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-07-20 16:54:25,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1423962548] [2020-07-20 16:54:25,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:25,653 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 28 [2020-07-20 16:54:25,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722844038] [2020-07-20 16:54:25,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 16:54:25,654 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:25,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 16:54:25,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=652, Unknown=0, NotChecked=0, Total=756 [2020-07-20 16:54:25,655 INFO L87 Difference]: Start difference. First operand 174 states and 278 transitions. Second operand 28 states. [2020-07-20 16:54:25,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:25,939 INFO L93 Difference]: Finished difference Result 208 states and 357 transitions. [2020-07-20 16:54:25,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-20 16:54:25,941 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 121 [2020-07-20 16:54:25,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:25,946 INFO L225 Difference]: With dead ends: 208 [2020-07-20 16:54:25,946 INFO L226 Difference]: Without dead ends: 204 [2020-07-20 16:54:25,948 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 188 SyntacticMatches, 27 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 581 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=111, Invalid=701, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:54:25,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2020-07-20 16:54:25,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 197. [2020-07-20 16:54:25,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-20 16:54:25,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 340 transitions. [2020-07-20 16:54:25,978 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 340 transitions. Word has length 121 [2020-07-20 16:54:25,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:25,979 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 340 transitions. [2020-07-20 16:54:25,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 16:54:25,979 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 340 transitions. [2020-07-20 16:54:25,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-20 16:54:25,984 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:25,985 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:26,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:26,200 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:26,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:26,201 INFO L82 PathProgramCache]: Analyzing trace with hash -2102107778, now seen corresponding path program 9 times [2020-07-20 16:54:26,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:26,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [285583789] [2020-07-20 16:54:26,202 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:26,377 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:26,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:26,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:54:26,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:26,527 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 262 proven. 67 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-20 16:54:26,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:27,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:27,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:27,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:27,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:27,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,102 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-07-20 16:54:28,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [285583789] [2020-07-20 16:54:28,103 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:28,103 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-20 16:54:28,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98102737] [2020-07-20 16:54:28,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:54:28,104 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:28,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:54:28,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:54:28,106 INFO L87 Difference]: Start difference. First operand 197 states and 340 transitions. Second operand 19 states. [2020-07-20 16:54:28,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:28,869 INFO L93 Difference]: Finished difference Result 410 states and 770 transitions. [2020-07-20 16:54:28,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 16:54:28,871 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 136 [2020-07-20 16:54:28,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:28,877 INFO L225 Difference]: With dead ends: 410 [2020-07-20 16:54:28,877 INFO L226 Difference]: Without dead ends: 219 [2020-07-20 16:54:28,881 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 241 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=161, Invalid=709, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:54:28,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2020-07-20 16:54:28,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 208. [2020-07-20 16:54:28,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-20 16:54:28,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 377 transitions. [2020-07-20 16:54:28,916 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 377 transitions. Word has length 136 [2020-07-20 16:54:28,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:28,921 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 377 transitions. [2020-07-20 16:54:28,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:54:28,921 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 377 transitions. [2020-07-20 16:54:28,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2020-07-20 16:54:28,927 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:28,928 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 8, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:29,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:29,144 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:29,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:29,145 INFO L82 PathProgramCache]: Analyzing trace with hash -892586014, now seen corresponding path program 10 times [2020-07-20 16:54:29,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:29,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [77054528] [2020-07-20 16:54:29,147 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:29,323 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:54:29,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:29,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:54:29,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:29,504 INFO L134 CoverageAnalysis]: Checked inductivity of 633 backedges. 357 proven. 32 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked. [2020-07-20 16:54:29,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:30,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:30,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:30,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:30,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:30,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:31,045 INFO L134 CoverageAnalysis]: Checked inductivity of 633 backedges. 81 proven. 208 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2020-07-20 16:54:31,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [77054528] [2020-07-20 16:54:31,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:31,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:54:31,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7210689] [2020-07-20 16:54:31,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:54:31,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:31,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:54:31,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:54:31,050 INFO L87 Difference]: Start difference. First operand 208 states and 377 transitions. Second operand 17 states. [2020-07-20 16:54:31,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:31,736 INFO L93 Difference]: Finished difference Result 420 states and 786 transitions. [2020-07-20 16:54:31,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:54:31,738 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 160 [2020-07-20 16:54:31,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:31,743 INFO L225 Difference]: With dead ends: 420 [2020-07-20 16:54:31,743 INFO L226 Difference]: Without dead ends: 217 [2020-07-20 16:54:31,747 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 293 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:54:31,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2020-07-20 16:54:31,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 197. [2020-07-20 16:54:31,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-20 16:54:31,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 343 transitions. [2020-07-20 16:54:31,780 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 343 transitions. Word has length 160 [2020-07-20 16:54:31,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:31,781 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 343 transitions. [2020-07-20 16:54:31,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:54:31,781 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 343 transitions. [2020-07-20 16:54:31,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 16:54:31,785 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:31,785 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:31,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:32,000 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:32,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:32,001 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 11 times [2020-07-20 16:54:32,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:32,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1956453554] [2020-07-20 16:54:32,002 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:32,237 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:54:32,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 16:54:32,238 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:54:32,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 16:54:32,273 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:54:32,330 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 16:54:32,331 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 16:54:32,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:32,669 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:54:32 BoogieIcfgContainer [2020-07-20 16:54:32,670 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:54:32,673 INFO L168 Benchmark]: Toolchain (without parser) took 51132.19 ms. Allocated memory was 143.7 MB in the beginning and 553.6 MB in the end (delta: 410.0 MB). Free memory was 102.0 MB in the beginning and 412.6 MB in the end (delta: -310.6 MB). Peak memory consumption was 99.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:54:32,674 INFO L168 Benchmark]: CDTParser took 0.34 ms. Allocated memory is still 143.7 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 16:54:32,675 INFO L168 Benchmark]: CACSL2BoogieTranslator took 443.14 ms. Allocated memory is still 143.7 MB. Free memory was 101.5 MB in the beginning and 92.0 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-20 16:54:32,675 INFO L168 Benchmark]: Boogie Preprocessor took 203.21 ms. Allocated memory was 143.7 MB in the beginning and 201.9 MB in the end (delta: 58.2 MB). Free memory was 92.0 MB in the beginning and 180.2 MB in the end (delta: -88.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-20 16:54:32,676 INFO L168 Benchmark]: RCFGBuilder took 470.25 ms. Allocated memory is still 201.9 MB. Free memory was 180.2 MB in the beginning and 166.8 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:54:32,676 INFO L168 Benchmark]: TraceAbstraction took 50002.82 ms. Allocated memory was 201.9 MB in the beginning and 553.6 MB in the end (delta: 351.8 MB). Free memory was 166.8 MB in the beginning and 412.6 MB in the end (delta: -245.8 MB). Peak memory consumption was 106.0 MB. Max. memory is 7.1 GB. [2020-07-20 16:54:32,679 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34 ms. Allocated memory is still 143.7 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 443.14 ms. Allocated memory is still 143.7 MB. Free memory was 101.5 MB in the beginning and 92.0 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 203.21 ms. Allocated memory was 143.7 MB in the beginning and 201.9 MB in the end (delta: 58.2 MB). Free memory was 92.0 MB in the beginning and 180.2 MB in the end (delta: -88.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 470.25 ms. Allocated memory is still 201.9 MB. Free memory was 180.2 MB in the beginning and 166.8 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 50002.82 ms. Allocated memory was 201.9 MB in the beginning and 553.6 MB in the end (delta: 351.8 MB). Free memory was 166.8 MB in the beginning and 412.6 MB in the end (delta: -245.8 MB). Peak memory consumption was 106.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 5; VAL [x=5] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=5, x=5] [L37] int result = fibo1(x); [L38] COND TRUE result == 5 VAL [result=5, x=5] [L39] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 49.6s, OverallIterations: 26, TraceHistogramMax: 15, AutomataDifference: 12.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 706 SDtfs, 1329 SDslu, 4900 SDs, 0 SdLazy, 5590 SolverSat, 1314 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4366 GetRequests, 3637 SyntacticMatches, 229 SemanticMatches, 500 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2187 ImplicationChecksByTransitivity, 9.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=219occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.6s AutomataMinimizationTime, 25 MinimizatonAttempts, 325 StatesRemovedByMinimization, 24 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.8s SatisfiabilityAnalysisTime, 27.5s InterpolantComputationTime, 2202 NumberOfCodeBlocks, 1357 NumberOfCodeBlocksAsserted, 67 NumberOfCheckSat, 4111 ConstructedInterpolants, 0 QuantifiedInterpolants, 863309 SizeOfPredicates, 136 NumberOfNonLiveVariables, 3446 ConjunctsInSsa, 282 ConjunctsInUnsatCore, 48 InterpolantComputations, 2 PerfectInterpolantSequences, 7505/10454 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...