/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:35:56,644 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:35:56,646 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:35:56,658 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 21:35:56,658 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:35:56,659 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:35:56,660 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:35:56,662 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:35:56,664 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:35:56,665 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:35:56,665 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:35:56,667 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:35:56,667 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:35:56,668 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:35:56,669 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:35:56,670 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:35:56,671 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:35:56,672 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:35:56,673 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:35:56,675 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:35:56,677 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:35:56,678 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:35:56,679 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:35:56,680 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:35:56,682 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:35:56,692 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:35:56,693 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:35:56,696 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:35:56,697 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 21:35:56,718 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:35:56,718 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:35:56,720 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:35:56,721 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:35:56,721 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:35:56,721 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:35:56,721 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:35:56,721 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:35:56,722 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:35:56,722 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:35:56,722 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:35:56,722 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:35:56,722 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:35:56,723 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:35:56,723 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:35:56,723 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:35:56,723 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:35:56,723 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:35:56,724 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:35:56,724 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:35:56,724 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:35:56,724 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:35:56,724 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:35:56,725 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:35:56,725 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:35:56,725 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:35:56,725 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:56,725 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:35:56,725 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:35:56,726 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 21:35:56,997 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:35:57,010 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:35:57,013 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:35:57,015 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:35:57,015 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:35:57,016 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-1.c [2020-07-20 21:35:57,090 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ceca3340a/e53065ecc66b430c8e52120abccf3bfe/FLAGaf99b38da [2020-07-20 21:35:57,589 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:35:57,590 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_6-1.c [2020-07-20 21:35:57,596 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ceca3340a/e53065ecc66b430c8e52120abccf3bfe/FLAGaf99b38da [2020-07-20 21:35:57,936 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ceca3340a/e53065ecc66b430c8e52120abccf3bfe [2020-07-20 21:35:57,944 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:35:57,948 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:35:57,949 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:35:57,950 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:35:57,953 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:35:57,955 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:35:57" (1/1) ... [2020-07-20 21:35:57,958 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1682d26c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:57, skipping insertion in model container [2020-07-20 21:35:57,958 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:35:57" (1/1) ... [2020-07-20 21:35:57,967 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:35:57,984 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:35:58,168 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:35:58,172 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:35:58,191 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:35:58,205 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:35:58,206 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:58 WrapperNode [2020-07-20 21:35:58,206 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:35:58,207 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:35:58,207 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:35:58,207 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:35:58,218 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:58" (1/1) ... [2020-07-20 21:35:58,219 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:58" (1/1) ... [2020-07-20 21:35:58,224 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:58" (1/1) ... [2020-07-20 21:35:58,225 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:58" (1/1) ... [2020-07-20 21:35:58,229 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:58" (1/1) ... [2020-07-20 21:35:58,231 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:58" (1/1) ... [2020-07-20 21:35:58,232 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:58" (1/1) ... [2020-07-20 21:35:58,234 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:35:58,234 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:35:58,234 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:35:58,234 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:35:58,235 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:58" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:35:58,386 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:35:58,386 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:35:58,386 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 21:35:58,386 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 21:35:58,387 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:35:58,387 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:35:58,387 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:35:58,387 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 21:35:58,387 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 21:35:58,387 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:35:58,388 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:35:58,388 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:35:58,695 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:35:58,696 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:35:58,699 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:35:58 BoogieIcfgContainer [2020-07-20 21:35:58,700 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:35:58,701 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:35:58,701 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:35:58,705 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:35:58,705 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:35:57" (1/3) ... [2020-07-20 21:35:58,706 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@518fa830 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:35:58, skipping insertion in model container [2020-07-20 21:35:58,706 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:58" (2/3) ... [2020-07-20 21:35:58,707 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@518fa830 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:35:58, skipping insertion in model container [2020-07-20 21:35:58,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:35:58" (3/3) ... [2020-07-20 21:35:58,709 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-1.c [2020-07-20 21:35:58,718 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:35:58,725 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:35:58,740 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:35:58,768 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:35:58,768 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:35:58,768 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:35:58,768 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:35:58,769 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:35:58,769 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:35:58,769 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:35:58,769 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:35:58,791 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 21:35:58,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:35:58,799 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:58,800 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:58,801 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:58,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:58,808 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 21:35:58,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:58,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1048474675] [2020-07-20 21:35:58,820 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 21:35:58,890 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:35:58,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:58,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:35:58,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:59,001 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:35:59,002 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:35:59,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1048474675] [2020-07-20 21:35:59,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:35:59,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:35:59,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686361869] [2020-07-20 21:35:59,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:35:59,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:59,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:35:59,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:35:59,028 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 21:35:59,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:59,142 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 21:35:59,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:35:59,146 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:35:59,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:59,158 INFO L225 Difference]: With dead ends: 44 [2020-07-20 21:35:59,158 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 21:35:59,162 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 21:35:59,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 21:35:59,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 21:35:59,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:35:59,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 21:35:59,211 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 21:35:59,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:59,212 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 21:35:59,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:35:59,212 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 21:35:59,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 21:35:59,214 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:59,214 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:59,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:59,429 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:59,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:59,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 21:35:59,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:59,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [356532219] [2020-07-20 21:35:59,432 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 21:35:59,470 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:35:59,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:59,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:35:59,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:59,520 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 21:35:59,520 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:35:59,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [356532219] [2020-07-20 21:35:59,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:35:59,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:35:59,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19460081] [2020-07-20 21:35:59,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:35:59,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:59,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:35:59,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:35:59,527 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 21:35:59,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:59,629 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 21:35:59,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:35:59,631 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 21:35:59,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:59,633 INFO L225 Difference]: With dead ends: 36 [2020-07-20 21:35:59,633 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 21:35:59,636 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 21:35:59,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 21:35:59,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 21:35:59,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:35:59,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 21:35:59,658 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 21:35:59,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:59,659 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 21:35:59,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:35:59,659 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 21:35:59,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:35:59,664 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:59,664 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 21:35:59,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:59,865 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:59,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:59,866 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 21:35:59,866 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:59,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [543586710] [2020-07-20 21:35:59,867 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 21:35:59,897 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:35:59,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:59,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:35:59,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:59,972 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 21:35:59,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:00,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:00,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:00,197 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 21:36:00,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [543586710] [2020-07-20 21:36:00,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:00,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 21:36:00,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428036218] [2020-07-20 21:36:00,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 21:36:00,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:00,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 21:36:00,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:36:00,201 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 21:36:00,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:00,349 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 21:36:00,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:36:00,350 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 21:36:00,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:00,352 INFO L225 Difference]: With dead ends: 41 [2020-07-20 21:36:00,352 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 21:36:00,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 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 21:36:00,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 21:36:00,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 21:36:00,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:36:00,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 21:36:00,363 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 21:36:00,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:00,364 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 21:36:00,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 21:36:00,364 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 21:36:00,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:36:00,366 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:00,366 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 21:36:00,579 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:00,580 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:00,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:00,581 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 21:36:00,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:00,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1875106668] [2020-07-20 21:36:00,582 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 21:36:00,620 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:00,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:00,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:36:00,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:00,678 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 21:36:00,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:00,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:00,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:00,879 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 21:36:00,880 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1875106668] [2020-07-20 21:36:00,880 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:00,880 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 21:36:00,881 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249597508] [2020-07-20 21:36:00,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 21:36:00,882 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:00,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 21:36:00,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:36:00,883 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 21:36:01,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:01,046 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 21:36:01,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:36:01,047 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 21:36:01,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:01,049 INFO L225 Difference]: With dead ends: 46 [2020-07-20 21:36:01,050 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 21:36:01,051 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 21:36:01,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 21:36:01,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 21:36:01,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:36:01,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 21:36:01,070 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 21:36:01,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:01,071 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 21:36:01,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 21:36:01,073 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 21:36:01,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 21:36:01,076 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:01,076 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 21:36:01,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:01,290 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:01,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:01,291 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 21:36:01,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:01,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [870945652] [2020-07-20 21:36:01,292 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 21:36:01,323 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:01,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:01,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:01,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:01,387 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 21:36:01,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:01,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:01,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:01,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:01,766 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 21:36:01,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [870945652] [2020-07-20 21:36:01,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:01,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 21:36:01,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061403481] [2020-07-20 21:36:01,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:36:01,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:01,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:36:01,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:36:01,769 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 21:36:01,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:01,942 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 21:36:01,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:01,943 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 21:36:01,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:01,945 INFO L225 Difference]: With dead ends: 51 [2020-07-20 21:36:01,945 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 21:36:01,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:01,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 21:36:01,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 21:36:01,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 21:36:01,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 21:36:01,958 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 21:36:01,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:01,958 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 21:36:01,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:36:01,958 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 21:36:01,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 21:36:01,960 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:01,960 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 21:36:02,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:02,166 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:02,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:02,166 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 21:36:02,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:02,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [741171959] [2020-07-20 21:36:02,168 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 21:36:02,199 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:02,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:02,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:02,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:02,246 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 21:36:02,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:02,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:02,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:02,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:02,577 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:36:02,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [741171959] [2020-07-20 21:36:02,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:02,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 21:36:02,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547433555] [2020-07-20 21:36:02,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:36:02,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:02,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:36:02,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:36:02,579 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 21:36:02,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:02,740 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 21:36:02,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:02,742 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 21:36:02,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:02,744 INFO L225 Difference]: With dead ends: 56 [2020-07-20 21:36:02,744 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 21:36:02,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:02,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 21:36:02,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 21:36:02,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 21:36:02,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 21:36:02,765 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 21:36:02,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:02,768 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 21:36:02,768 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:36:02,769 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 21:36:02,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 21:36:02,772 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:02,772 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 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 21:36:02,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:02,974 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:02,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:02,974 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 21:36:02,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:02,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [541673030] [2020-07-20 21:36:02,975 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 21:36:03,037 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:03,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:03,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:03,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:03,107 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 21:36:03,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:03,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,672 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 21:36:03,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [541673030] [2020-07-20 21:36:03,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:03,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 21:36:03,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366179249] [2020-07-20 21:36:03,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:36:03,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:03,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:36:03,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:03,674 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 21:36:03,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:03,888 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 21:36:03,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:03,889 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 21:36:03,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:03,891 INFO L225 Difference]: With dead ends: 61 [2020-07-20 21:36:03,891 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 21:36:03,894 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 21:36:03,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 21:36:03,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 21:36:03,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 21:36:03,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 21:36:03,904 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 21:36:03,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:03,905 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 21:36:03,905 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:36:03,905 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 21:36:03,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 21:36:03,907 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:03,907 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 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 21:36:04,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:04,113 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:04,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:04,114 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 21:36:04,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:04,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722129751] [2020-07-20 21:36:04,115 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 21:36:04,153 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:04,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:04,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:04,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:04,238 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-20 21:36:04,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:04,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,732 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 21:36:04,733 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722129751] [2020-07-20 21:36:04,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:04,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 21:36:04,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062725932] [2020-07-20 21:36:04,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:36:04,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:04,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:36:04,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:04,735 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-20 21:36:04,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:04,944 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 21:36:04,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:04,945 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-20 21:36:04,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:04,948 INFO L225 Difference]: With dead ends: 66 [2020-07-20 21:36:04,948 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 21:36:04,949 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 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 21:36:04,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 21:36:04,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 21:36:04,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 21:36:04,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 21:36:04,959 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 21:36:04,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:04,960 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 21:36:04,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:36:04,960 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 21:36:04,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 21:36:04,962 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:04,962 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 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 21:36:05,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:05,165 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:05,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:05,166 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 21:36:05,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:05,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [503266056] [2020-07-20 21:36:05,167 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 21:36:05,218 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:05,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:05,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:05,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:05,320 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 21:36:05,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:05,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,239 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-20 21:36:06,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [503266056] [2020-07-20 21:36:06,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:06,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 21:36:06,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996913759] [2020-07-20 21:36:06,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 21:36:06,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:06,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 21:36:06,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 21:36:06,243 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-20 21:36:06,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:06,507 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 21:36:06,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:06,508 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-20 21:36:06,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:06,511 INFO L225 Difference]: With dead ends: 71 [2020-07-20 21:36:06,511 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 21:36:06,512 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:36:06,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 21:36:06,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 21:36:06,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 21:36:06,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 21:36:06,524 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 21:36:06,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:06,524 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 21:36:06,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 21:36:06,525 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 21:36:06,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 21:36:06,526 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:06,527 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:06,739 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:06,740 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:06,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:06,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 21:36:06,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:06,742 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1202414397] [2020-07-20 21:36:06,743 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 21:36:06,805 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:06,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:06,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:06,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:06,888 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-20 21:36:06,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:07,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:07,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:07,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:07,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:07,786 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 21:36:07,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1202414397] [2020-07-20 21:36:07,787 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:07,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:07,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866118257] [2020-07-20 21:36:07,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:07,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:07,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:07,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:07,790 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 15 states. [2020-07-20 21:36:08,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:08,017 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-20 21:36:08,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:08,018 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 108 [2020-07-20 21:36:08,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:08,020 INFO L225 Difference]: With dead ends: 76 [2020-07-20 21:36:08,020 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 21:36:08,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 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 21:36:08,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 21:36:08,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-20 21:36:08,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 21:36:08,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 21:36:08,033 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-20 21:36:08,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:08,034 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 21:36:08,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:08,034 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 21:36:08,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-20 21:36:08,037 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:08,037 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:08,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:08,253 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:08,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:08,254 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-20 21:36:08,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:08,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1976513101] [2020-07-20 21:36:08,255 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 21:36:08,350 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:08,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:08,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:36:08,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:08,448 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-20 21:36:08,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:09,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:10,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:10,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:10,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-20 21:36:10,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1976513101] [2020-07-20 21:36:10,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:10,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 21:36:10,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202968877] [2020-07-20 21:36:10,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:36:10,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:10,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:36:10,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:10,081 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 17 states. [2020-07-20 21:36:10,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:10,348 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-20 21:36:10,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:36:10,349 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 208 [2020-07-20 21:36:10,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:10,351 INFO L225 Difference]: With dead ends: 81 [2020-07-20 21:36:10,351 INFO L226 Difference]: Without dead ends: 77 [2020-07-20 21:36:10,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:36:10,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-20 21:36:10,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-20 21:36:10,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 21:36:10,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 21:36:10,365 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-20 21:36:10,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:10,365 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 21:36:10,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:36:10,365 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 21:36:10,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2020-07-20 21:36:10,367 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:10,368 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:10,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:10,583 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:10,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:10,584 INFO L82 PathProgramCache]: Analyzing trace with hash -1298373331, now seen corresponding path program 2 times [2020-07-20 21:36:10,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:10,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1129171715] [2020-07-20 21:36:10,585 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 21:36:10,670 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:10,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:10,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:10,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:10,742 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 42 proven. 156 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 21:36:10,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:11,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,759 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 42 proven. 164 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2020-07-20 21:36:11,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1129171715] [2020-07-20 21:36:11,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:11,760 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:11,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684681612] [2020-07-20 21:36:11,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:11,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:11,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:11,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:11,763 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 15 states. [2020-07-20 21:36:11,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:11,980 INFO L93 Difference]: Finished difference Result 99 states and 221 transitions. [2020-07-20 21:36:11,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:11,981 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 148 [2020-07-20 21:36:11,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:11,985 INFO L225 Difference]: With dead ends: 99 [2020-07-20 21:36:11,985 INFO L226 Difference]: Without dead ends: 95 [2020-07-20 21:36:11,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 272 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 21:36:11,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-20 21:36:12,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 57. [2020-07-20 21:36:12,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-20 21:36:12,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 92 transitions. [2020-07-20 21:36:12,011 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 92 transitions. Word has length 148 [2020-07-20 21:36:12,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:12,012 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 92 transitions. [2020-07-20 21:36:12,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:12,012 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 92 transitions. [2020-07-20 21:36:12,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-20 21:36:12,015 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:12,015 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:12,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:12,230 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:12,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:12,231 INFO L82 PathProgramCache]: Analyzing trace with hash 2095197631, now seen corresponding path program 1 times [2020-07-20 21:36:12,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:12,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200504207] [2020-07-20 21:36:12,232 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 21:36:12,325 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:12,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:12,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:12,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:12,414 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 48 proven. 89 refuted. 0 times theorem prover too weak. 221 trivial. 0 not checked. [2020-07-20 21:36:12,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:12,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,051 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 48 proven. 94 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2020-07-20 21:36:13,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200504207] [2020-07-20 21:36:13,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:13,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:13,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930737248] [2020-07-20 21:36:13,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:13,053 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:13,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:13,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:13,053 INFO L87 Difference]: Start difference. First operand 57 states and 92 transitions. Second operand 13 states. [2020-07-20 21:36:13,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:13,247 INFO L93 Difference]: Finished difference Result 99 states and 217 transitions. [2020-07-20 21:36:13,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:13,248 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 123 [2020-07-20 21:36:13,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:13,250 INFO L225 Difference]: With dead ends: 99 [2020-07-20 21:36:13,250 INFO L226 Difference]: Without dead ends: 95 [2020-07-20 21:36:13,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 226 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:13,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-20 21:36:13,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 59. [2020-07-20 21:36:13,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-20 21:36:13,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 98 transitions. [2020-07-20 21:36:13,270 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 98 transitions. Word has length 123 [2020-07-20 21:36:13,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:13,272 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 98 transitions. [2020-07-20 21:36:13,272 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:13,272 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 98 transitions. [2020-07-20 21:36:13,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2020-07-20 21:36:13,275 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:13,275 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 11, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:13,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:13,489 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:13,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:13,490 INFO L82 PathProgramCache]: Analyzing trace with hash 1017418174, now seen corresponding path program 1 times [2020-07-20 21:36:13,490 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:13,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [663697000] [2020-07-20 21:36:13,491 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 21:36:13,606 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:13,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:13,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:36:13,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:13,738 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 114 proven. 290 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2020-07-20 21:36:13,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:14,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:14,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:15,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:15,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:15,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:15,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:15,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:15,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:15,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:15,400 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 116 proven. 304 refuted. 0 times theorem prover too weak. 829 trivial. 0 not checked. [2020-07-20 21:36:15,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [663697000] [2020-07-20 21:36:15,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:15,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 21:36:15,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827295278] [2020-07-20 21:36:15,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:36:15,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:15,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:36:15,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:15,403 INFO L87 Difference]: Start difference. First operand 59 states and 98 transitions. Second operand 17 states. [2020-07-20 21:36:15,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:15,754 INFO L93 Difference]: Finished difference Result 113 states and 271 transitions. [2020-07-20 21:36:15,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:36:15,755 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 216 [2020-07-20 21:36:15,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:15,760 INFO L225 Difference]: With dead ends: 113 [2020-07-20 21:36:15,760 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 21:36:15,763 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 403 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:36:15,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 21:36:15,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-07-20 21:36:15,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-20 21:36:15,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 104 transitions. [2020-07-20 21:36:15,776 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 104 transitions. Word has length 216 [2020-07-20 21:36:15,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:15,778 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 104 transitions. [2020-07-20 21:36:15,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:36:15,778 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 104 transitions. [2020-07-20 21:36:15,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-20 21:36:15,782 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:15,782 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:15,995 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:15,996 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:15,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:15,997 INFO L82 PathProgramCache]: Analyzing trace with hash -1521837768, now seen corresponding path program 2 times [2020-07-20 21:36:15,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:15,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [818286592] [2020-07-20 21:36:15,997 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 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 21:36:16,117 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:16,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:16,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:16,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:16,191 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 62 proven. 114 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2020-07-20 21:36:16,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:16,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:16,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:16,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,155 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 62 proven. 122 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2020-07-20 21:36:17,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [818286592] [2020-07-20 21:36:17,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:17,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:17,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327738504] [2020-07-20 21:36:17,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:17,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:17,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:17,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:17,157 INFO L87 Difference]: Start difference. First operand 67 states and 104 transitions. Second operand 15 states. [2020-07-20 21:36:17,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:17,410 INFO L93 Difference]: Finished difference Result 107 states and 201 transitions. [2020-07-20 21:36:17,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:17,411 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 135 [2020-07-20 21:36:17,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:17,416 INFO L225 Difference]: With dead ends: 107 [2020-07-20 21:36:17,416 INFO L226 Difference]: Without dead ends: 100 [2020-07-20 21:36:17,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 245 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 21:36:17,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-20 21:36:17,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 70. [2020-07-20 21:36:17,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 21:36:17,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 112 transitions. [2020-07-20 21:36:17,441 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 112 transitions. Word has length 135 [2020-07-20 21:36:17,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:17,442 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 112 transitions. [2020-07-20 21:36:17,442 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:17,442 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 112 transitions. [2020-07-20 21:36:17,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-07-20 21:36:17,445 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:17,445 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 10, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:17,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:17,658 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:17,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:17,658 INFO L82 PathProgramCache]: Analyzing trace with hash 1102424554, now seen corresponding path program 3 times [2020-07-20 21:36:17,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:17,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805484289] [2020-07-20 21:36:17,659 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 21:36:17,828 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:17,828 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:17,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:36:17,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:17,945 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 159 proven. 114 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2020-07-20 21:36:17,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:18,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,448 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 159 proven. 130 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-20 21:36:19,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805484289] [2020-07-20 21:36:19,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:19,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 21:36:19,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596790765] [2020-07-20 21:36:19,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:36:19,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:19,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:36:19,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:19,451 INFO L87 Difference]: Start difference. First operand 70 states and 112 transitions. Second operand 17 states. [2020-07-20 21:36:19,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:19,821 INFO L93 Difference]: Finished difference Result 107 states and 197 transitions. [2020-07-20 21:36:19,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:36:19,822 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 163 [2020-07-20 21:36:19,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:19,825 INFO L225 Difference]: With dead ends: 107 [2020-07-20 21:36:19,825 INFO L226 Difference]: Without dead ends: 75 [2020-07-20 21:36:19,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 297 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:36:19,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-20 21:36:19,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-07-20 21:36:19,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-20 21:36:19,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 115 transitions. [2020-07-20 21:36:19,834 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 115 transitions. Word has length 163 [2020-07-20 21:36:19,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:19,835 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 115 transitions. [2020-07-20 21:36:19,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:36:19,835 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 115 transitions. [2020-07-20 21:36:19,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-20 21:36:19,837 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:19,837 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 21:36:20,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:20,052 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:20,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:20,053 INFO L82 PathProgramCache]: Analyzing trace with hash -2102107778, now seen corresponding path program 4 times [2020-07-20 21:36:20,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:20,054 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [523845694] [2020-07-20 21:36:20,054 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 21:36:20,193 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:20,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:20,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:20,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:20,252 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 79 proven. 76 refuted. 0 times theorem prover too weak. 282 trivial. 0 not checked. [2020-07-20 21:36:20,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:20,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:20,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:20,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:20,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:20,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:20,913 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 79 proven. 81 refuted. 0 times theorem prover too weak. 277 trivial. 0 not checked. [2020-07-20 21:36:20,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [523845694] [2020-07-20 21:36:20,914 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:20,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:20,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018375751] [2020-07-20 21:36:20,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:20,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:20,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:20,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:20,915 INFO L87 Difference]: Start difference. First operand 75 states and 115 transitions. Second operand 13 states. [2020-07-20 21:36:21,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:21,088 INFO L93 Difference]: Finished difference Result 107 states and 179 transitions. [2020-07-20 21:36:21,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:21,089 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 136 [2020-07-20 21:36:21,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:21,091 INFO L225 Difference]: With dead ends: 107 [2020-07-20 21:36:21,091 INFO L226 Difference]: Without dead ends: 100 [2020-07-20 21:36:21,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 251 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:21,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-20 21:36:21,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 82. [2020-07-20 21:36:21,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 21:36:21,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 136 transitions. [2020-07-20 21:36:21,108 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 136 transitions. Word has length 136 [2020-07-20 21:36:21,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:21,108 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 136 transitions. [2020-07-20 21:36:21,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:21,109 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 136 transitions. [2020-07-20 21:36:21,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2020-07-20 21:36:21,111 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:21,111 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 8, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:21,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:21,325 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:21,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:21,326 INFO L82 PathProgramCache]: Analyzing trace with hash -1316077641, now seen corresponding path program 5 times [2020-07-20 21:36:21,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:21,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [113234730] [2020-07-20 21:36:21,327 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 21:36:21,449 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:21,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:21,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:21,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:21,558 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 106 proven. 98 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-07-20 21:36:21,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:22,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:22,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:22,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:22,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:22,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:22,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:22,571 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 108 proven. 104 refuted. 0 times theorem prover too weak. 317 trivial. 0 not checked. [2020-07-20 21:36:22,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [113234730] [2020-07-20 21:36:22,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:22,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:22,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735923858] [2020-07-20 21:36:22,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:22,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:22,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:22,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:22,573 INFO L87 Difference]: Start difference. First operand 82 states and 136 transitions. Second operand 15 states. [2020-07-20 21:36:22,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:22,807 INFO L93 Difference]: Finished difference Result 117 states and 203 transitions. [2020-07-20 21:36:22,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:22,807 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 148 [2020-07-20 21:36:22,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:22,810 INFO L225 Difference]: With dead ends: 117 [2020-07-20 21:36:22,810 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 21:36:22,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 271 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 21:36:22,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 21:36:22,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80. [2020-07-20 21:36:22,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 21:36:22,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 128 transitions. [2020-07-20 21:36:22,820 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 128 transitions. Word has length 148 [2020-07-20 21:36:22,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:22,820 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 128 transitions. [2020-07-20 21:36:22,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:22,821 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 128 transitions. [2020-07-20 21:36:22,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-20 21:36:22,822 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:22,823 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 9, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:23,034 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:23,034 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:23,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:23,035 INFO L82 PathProgramCache]: Analyzing trace with hash -872965087, now seen corresponding path program 6 times [2020-07-20 21:36:23,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:23,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213975729] [2020-07-20 21:36:23,035 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 21:36:23,173 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:23,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:23,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:23,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:23,240 INFO L134 CoverageAnalysis]: Checked inductivity of 537 backedges. 88 proven. 81 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-20 21:36:23,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:23,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,967 INFO L134 CoverageAnalysis]: Checked inductivity of 537 backedges. 88 proven. 85 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 21:36:23,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213975729] [2020-07-20 21:36:23,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:23,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:23,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865985161] [2020-07-20 21:36:23,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:23,970 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:23,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:23,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:23,971 INFO L87 Difference]: Start difference. First operand 80 states and 128 transitions. Second operand 13 states. [2020-07-20 21:36:24,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:24,124 INFO L93 Difference]: Finished difference Result 114 states and 190 transitions. [2020-07-20 21:36:24,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:24,124 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 149 [2020-07-20 21:36:24,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:24,127 INFO L225 Difference]: With dead ends: 114 [2020-07-20 21:36:24,127 INFO L226 Difference]: Without dead ends: 107 [2020-07-20 21:36:24,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 277 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:24,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-20 21:36:24,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 80. [2020-07-20 21:36:24,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 21:36:24,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 128 transitions. [2020-07-20 21:36:24,140 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 128 transitions. Word has length 149 [2020-07-20 21:36:24,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:24,142 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 128 transitions. [2020-07-20 21:36:24,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:24,142 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 128 transitions. [2020-07-20 21:36:24,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-07-20 21:36:24,144 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:24,144 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 9, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:24,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:24,358 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:24,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:24,358 INFO L82 PathProgramCache]: Analyzing trace with hash -529934979, now seen corresponding path program 7 times [2020-07-20 21:36:24,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:24,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1929393608] [2020-07-20 21:36:24,359 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 21:36:24,508 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:24,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:24,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:24,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:24,562 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 141 proven. 34 refuted. 0 times theorem prover too weak. 369 trivial. 0 not checked. [2020-07-20 21:36:24,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:24,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:25,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:25,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:25,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:25,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:25,353 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 143 proven. 37 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 21:36:25,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1929393608] [2020-07-20 21:36:25,354 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:25,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:25,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418328087] [2020-07-20 21:36:25,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:25,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:25,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:25,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:25,357 INFO L87 Difference]: Start difference. First operand 80 states and 128 transitions. Second operand 13 states. [2020-07-20 21:36:25,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:25,525 INFO L93 Difference]: Finished difference Result 106 states and 183 transitions. [2020-07-20 21:36:25,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:25,525 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 150 [2020-07-20 21:36:25,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:25,527 INFO L225 Difference]: With dead ends: 106 [2020-07-20 21:36:25,527 INFO L226 Difference]: Without dead ends: 99 [2020-07-20 21:36:25,528 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 279 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:25,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-20 21:36:25,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 92. [2020-07-20 21:36:25,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-20 21:36:25,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 161 transitions. [2020-07-20 21:36:25,544 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 161 transitions. Word has length 150 [2020-07-20 21:36:25,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:25,544 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 161 transitions. [2020-07-20 21:36:25,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:25,544 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 161 transitions. [2020-07-20 21:36:25,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2020-07-20 21:36:25,546 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:25,547 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 9, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:25,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:25,762 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:25,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:25,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1102006884, now seen corresponding path program 8 times [2020-07-20 21:36:25,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:25,764 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1498945824] [2020-07-20 21:36:25,765 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 21:36:25,911 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:25,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:25,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:25,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:26,012 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 185 proven. 49 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-20 21:36:26,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:26,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:27,108 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 187 proven. 55 refuted. 0 times theorem prover too weak. 414 trivial. 0 not checked. [2020-07-20 21:36:27,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1498945824] [2020-07-20 21:36:27,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:27,109 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:27,109 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70193578] [2020-07-20 21:36:27,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:27,110 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:27,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:27,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:27,110 INFO L87 Difference]: Start difference. First operand 92 states and 161 transitions. Second operand 15 states. [2020-07-20 21:36:27,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:27,348 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2020-07-20 21:36:27,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:27,355 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 162 [2020-07-20 21:36:27,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:27,357 INFO L225 Difference]: With dead ends: 117 [2020-07-20 21:36:27,357 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 21:36:27,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 299 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 21:36:27,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 21:36:27,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 96. [2020-07-20 21:36:27,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-20 21:36:27,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 158 transitions. [2020-07-20 21:36:27,368 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 158 transitions. Word has length 162 [2020-07-20 21:36:27,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:27,368 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 158 transitions. [2020-07-20 21:36:27,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:27,369 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 158 transitions. [2020-07-20 21:36:27,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-07-20 21:36:27,371 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:27,371 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 10, 8, 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 21:36:27,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:27,587 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:27,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:27,587 INFO L82 PathProgramCache]: Analyzing trace with hash 1920867700, now seen corresponding path program 9 times [2020-07-20 21:36:27,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:27,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [232554174] [2020-07-20 21:36:27,588 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 21:36:27,750 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:27,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:27,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:27,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:27,811 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 149 proven. 37 refuted. 0 times theorem prover too weak. 479 trivial. 0 not checked. [2020-07-20 21:36:27,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:28,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,542 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 149 proven. 43 refuted. 0 times theorem prover too weak. 473 trivial. 0 not checked. [2020-07-20 21:36:28,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [232554174] [2020-07-20 21:36:28,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:28,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:28,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448093901] [2020-07-20 21:36:28,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:28,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:28,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:28,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:28,544 INFO L87 Difference]: Start difference. First operand 96 states and 158 transitions. Second operand 13 states. [2020-07-20 21:36:28,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:28,717 INFO L93 Difference]: Finished difference Result 129 states and 217 transitions. [2020-07-20 21:36:28,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:28,719 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 163 [2020-07-20 21:36:28,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:28,721 INFO L225 Difference]: With dead ends: 129 [2020-07-20 21:36:28,721 INFO L226 Difference]: Without dead ends: 122 [2020-07-20 21:36:28,723 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 305 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:28,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-20 21:36:28,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 93. [2020-07-20 21:36:28,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-20 21:36:28,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 149 transitions. [2020-07-20 21:36:28,732 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 149 transitions. Word has length 163 [2020-07-20 21:36:28,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:28,733 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 149 transitions. [2020-07-20 21:36:28,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:28,733 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 149 transitions. [2020-07-20 21:36:28,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2020-07-20 21:36:28,735 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:28,735 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 10, 9, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:28,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:28,950 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:28,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:28,951 INFO L82 PathProgramCache]: Analyzing trace with hash -1607241826, now seen corresponding path program 10 times [2020-07-20 21:36:28,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:28,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1262745619] [2020-07-20 21:36:28,952 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 21:36:29,107 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:29,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:29,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:29,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:29,184 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 123 proven. 32 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2020-07-20 21:36:29,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:29,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:29,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:29,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:29,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:29,710 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 123 proven. 34 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2020-07-20 21:36:29,711 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1262745619] [2020-07-20 21:36:29,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:29,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 21:36:29,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861190918] [2020-07-20 21:36:29,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:36:29,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:29,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:36:29,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:36:29,712 INFO L87 Difference]: Start difference. First operand 93 states and 149 transitions. Second operand 11 states. [2020-07-20 21:36:29,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:29,852 INFO L93 Difference]: Finished difference Result 131 states and 225 transitions. [2020-07-20 21:36:29,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:29,852 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 164 [2020-07-20 21:36:29,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:29,855 INFO L225 Difference]: With dead ends: 131 [2020-07-20 21:36:29,855 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 21:36:29,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 311 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 21:36:29,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 21:36:29,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 95. [2020-07-20 21:36:29,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-07-20 21:36:29,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 157 transitions. [2020-07-20 21:36:29,865 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 157 transitions. Word has length 164 [2020-07-20 21:36:29,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:29,866 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 157 transitions. [2020-07-20 21:36:29,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:36:29,866 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 157 transitions. [2020-07-20 21:36:29,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2020-07-20 21:36:29,868 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:29,869 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:30,081 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:30,082 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:30,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:30,083 INFO L82 PathProgramCache]: Analyzing trace with hash -315995755, now seen corresponding path program 11 times [2020-07-20 21:36:30,083 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:30,083 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611444534] [2020-07-20 21:36:30,084 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 21:36:30,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:30,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:30,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:30,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:30,317 INFO L134 CoverageAnalysis]: Checked inductivity of 777 backedges. 168 proven. 41 refuted. 0 times theorem prover too weak. 568 trivial. 0 not checked. [2020-07-20 21:36:30,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:30,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:31,094 INFO L134 CoverageAnalysis]: Checked inductivity of 777 backedges. 170 proven. 43 refuted. 0 times theorem prover too weak. 564 trivial. 0 not checked. [2020-07-20 21:36:31,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611444534] [2020-07-20 21:36:31,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:31,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:31,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993276282] [2020-07-20 21:36:31,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:31,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:31,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:31,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:31,097 INFO L87 Difference]: Start difference. First operand 95 states and 157 transitions. Second operand 13 states. [2020-07-20 21:36:31,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:31,260 INFO L93 Difference]: Finished difference Result 110 states and 175 transitions. [2020-07-20 21:36:31,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:31,261 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 176 [2020-07-20 21:36:31,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:31,262 INFO L225 Difference]: With dead ends: 110 [2020-07-20 21:36:31,262 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 21:36:31,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 331 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:31,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 21:36:31,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 93. [2020-07-20 21:36:31,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-20 21:36:31,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 149 transitions. [2020-07-20 21:36:31,271 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 149 transitions. Word has length 176 [2020-07-20 21:36:31,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:31,272 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 149 transitions. [2020-07-20 21:36:31,272 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:31,272 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 149 transitions. [2020-07-20 21:36:31,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2020-07-20 21:36:31,274 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:31,274 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 11, 11, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:31,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:31,490 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:31,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:31,491 INFO L82 PathProgramCache]: Analyzing trace with hash -854759576, now seen corresponding path program 12 times [2020-07-20 21:36:31,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:31,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [746858413] [2020-07-20 21:36:31,492 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 21:36:31,673 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:31,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:31,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:31,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:31,782 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 251 proven. 45 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2020-07-20 21:36:31,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:32,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:32,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:32,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:32,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:32,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:32,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:32,907 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 251 proven. 55 refuted. 0 times theorem prover too weak. 632 trivial. 0 not checked. [2020-07-20 21:36:32,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [746858413] [2020-07-20 21:36:32,908 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:32,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:32,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158719945] [2020-07-20 21:36:32,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:32,909 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:32,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:32,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:32,909 INFO L87 Difference]: Start difference. First operand 93 states and 149 transitions. Second operand 15 states. [2020-07-20 21:36:33,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:33,109 INFO L93 Difference]: Finished difference Result 123 states and 202 transitions. [2020-07-20 21:36:33,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:33,109 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 191 [2020-07-20 21:36:33,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:33,111 INFO L225 Difference]: With dead ends: 123 [2020-07-20 21:36:33,111 INFO L226 Difference]: Without dead ends: 116 [2020-07-20 21:36:33,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 357 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:33,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-20 21:36:33,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 101. [2020-07-20 21:36:33,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-20 21:36:33,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 173 transitions. [2020-07-20 21:36:33,125 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 173 transitions. Word has length 191 [2020-07-20 21:36:33,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:33,126 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 173 transitions. [2020-07-20 21:36:33,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:33,126 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 173 transitions. [2020-07-20 21:36:33,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2020-07-20 21:36:33,128 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:33,129 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 12, 11, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:33,342 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:33,343 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:33,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:33,343 INFO L82 PathProgramCache]: Analyzing trace with hash -31808317, now seen corresponding path program 13 times [2020-07-20 21:36:33,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:33,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301462136] [2020-07-20 21:36:33,344 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 21:36:33,521 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:33,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:33,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:36:33,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:33,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 270 proven. 100 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2020-07-20 21:36:33,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:34,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:34,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:34,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:34,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:34,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:34,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,264 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 270 proven. 116 refuted. 0 times theorem prover too weak. 687 trivial. 0 not checked. [2020-07-20 21:36:35,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301462136] [2020-07-20 21:36:35,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:35,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 21:36:35,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539756296] [2020-07-20 21:36:35,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:36:35,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:35,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:36:35,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:35,266 INFO L87 Difference]: Start difference. First operand 101 states and 173 transitions. Second operand 17 states. [2020-07-20 21:36:35,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:35,579 INFO L93 Difference]: Finished difference Result 121 states and 205 transitions. [2020-07-20 21:36:35,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:36:35,579 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 204 [2020-07-20 21:36:35,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:35,581 INFO L225 Difference]: With dead ends: 121 [2020-07-20 21:36:35,581 INFO L226 Difference]: Without dead ends: 114 [2020-07-20 21:36:35,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 379 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:36:35,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-20 21:36:35,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 93. [2020-07-20 21:36:35,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-20 21:36:35,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 161 transitions. [2020-07-20 21:36:35,592 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 161 transitions. Word has length 204 [2020-07-20 21:36:35,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:35,593 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 161 transitions. [2020-07-20 21:36:35,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:36:35,593 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 161 transitions. [2020-07-20 21:36:35,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-20 21:36:35,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:35,595 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:35,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:35,810 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:35,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:35,810 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 14 times [2020-07-20 21:36:35,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:35,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638525822] [2020-07-20 21:36:35,811 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 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:35,977 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:35,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:35,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-20 21:36:35,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:36,431 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 519 trivial. 0 not checked. [2020-07-20 21:36:36,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:38,243 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 519 trivial. 0 not checked. [2020-07-20 21:36:38,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638525822] [2020-07-20 21:36:38,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:38,244 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 36 [2020-07-20 21:36:38,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299124881] [2020-07-20 21:36:38,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 21:36:38,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:38,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 21:36:38,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1175, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 21:36:38,245 INFO L87 Difference]: Start difference. First operand 93 states and 161 transitions. Second operand 36 states. [2020-07-20 21:36:39,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:39,071 INFO L93 Difference]: Finished difference Result 226 states and 521 transitions. [2020-07-20 21:36:39,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 21:36:39,072 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 177 [2020-07-20 21:36:39,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:39,080 INFO L225 Difference]: With dead ends: 226 [2020-07-20 21:36:39,081 INFO L226 Difference]: Without dead ends: 219 [2020-07-20 21:36:39,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=109, Invalid=1613, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 21:36:39,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2020-07-20 21:36:39,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 145. [2020-07-20 21:36:39,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2020-07-20 21:36:39,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 323 transitions. [2020-07-20 21:36:39,120 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 323 transitions. Word has length 177 [2020-07-20 21:36:39,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:39,121 INFO L479 AbstractCegarLoop]: Abstraction has 145 states and 323 transitions. [2020-07-20 21:36:39,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 21:36:39,121 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 323 transitions. [2020-07-20 21:36:39,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2020-07-20 21:36:39,128 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:39,128 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 11, 11, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:39,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:39,344 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:39,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:39,344 INFO L82 PathProgramCache]: Analyzing trace with hash -1104223868, now seen corresponding path program 15 times [2020-07-20 21:36:39,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:39,345 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1893672800] [2020-07-20 21:36:39,345 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 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:39,558 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:39,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:39,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:39,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:39,646 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 148 proven. 140 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2020-07-20 21:36:39,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:40,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:40,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:40,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:40,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:40,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:40,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:40,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:40,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:40,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:40,867 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 148 proven. 152 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-20 21:36:40,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1893672800] [2020-07-20 21:36:40,868 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:40,868 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:40,868 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091683771] [2020-07-20 21:36:40,869 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:40,869 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:40,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:40,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:40,869 INFO L87 Difference]: Start difference. First operand 145 states and 323 transitions. Second operand 15 states. [2020-07-20 21:36:41,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:41,189 INFO L93 Difference]: Finished difference Result 205 states and 526 transitions. [2020-07-20 21:36:41,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:41,190 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 191 [2020-07-20 21:36:41,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:41,193 INFO L225 Difference]: With dead ends: 205 [2020-07-20 21:36:41,193 INFO L226 Difference]: Without dead ends: 173 [2020-07-20 21:36:41,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 357 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:41,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2020-07-20 21:36:41,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 154. [2020-07-20 21:36:41,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2020-07-20 21:36:41,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 344 transitions. [2020-07-20 21:36:41,221 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 344 transitions. Word has length 191 [2020-07-20 21:36:41,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:41,221 INFO L479 AbstractCegarLoop]: Abstraction has 154 states and 344 transitions. [2020-07-20 21:36:41,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:41,221 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 344 transitions. [2020-07-20 21:36:41,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 21:36:41,227 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:41,228 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 11, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:41,441 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:41,442 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:41,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:41,442 INFO L82 PathProgramCache]: Analyzing trace with hash -1441264276, now seen corresponding path program 16 times [2020-07-20 21:36:41,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:41,442 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [468965857] [2020-07-20 21:36:41,443 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 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:41,630 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:41,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:41,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:41,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:41,754 INFO L134 CoverageAnalysis]: Checked inductivity of 928 backedges. 93 proven. 201 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-20 21:36:41,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:42,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:42,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:42,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:42,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:42,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:42,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:42,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:42,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:42,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:42,894 INFO L134 CoverageAnalysis]: Checked inductivity of 928 backedges. 97 proven. 207 refuted. 0 times theorem prover too weak. 624 trivial. 0 not checked. [2020-07-20 21:36:42,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [468965857] [2020-07-20 21:36:42,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:42,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:42,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199372253] [2020-07-20 21:36:42,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:42,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:42,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:42,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:42,895 INFO L87 Difference]: Start difference. First operand 154 states and 344 transitions. Second operand 15 states. [2020-07-20 21:36:43,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:43,136 INFO L93 Difference]: Finished difference Result 205 states and 460 transitions. [2020-07-20 21:36:43,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:43,137 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 21:36:43,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:43,140 INFO L225 Difference]: With dead ends: 205 [2020-07-20 21:36:43,140 INFO L226 Difference]: Without dead ends: 154 [2020-07-20 21:36:43,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 355 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:43,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-20 21:36:43,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 148. [2020-07-20 21:36:43,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2020-07-20 21:36:43,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 314 transitions. [2020-07-20 21:36:43,162 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 314 transitions. Word has length 190 [2020-07-20 21:36:43,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:43,162 INFO L479 AbstractCegarLoop]: Abstraction has 148 states and 314 transitions. [2020-07-20 21:36:43,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:43,162 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 314 transitions. [2020-07-20 21:36:43,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2020-07-20 21:36:43,167 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:43,167 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 12, 11, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:43,380 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:43,381 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:43,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:43,381 INFO L82 PathProgramCache]: Analyzing trace with hash 2034664010, now seen corresponding path program 17 times [2020-07-20 21:36:43,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:43,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2048055321] [2020-07-20 21:36:43,382 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 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:43,596 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:43,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:43,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:43,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:43,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1217 backedges. 190 proven. 171 refuted. 0 times theorem prover too weak. 856 trivial. 0 not checked. [2020-07-20 21:36:43,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:44,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:44,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:44,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:44,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:44,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:44,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:44,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:45,018 INFO L134 CoverageAnalysis]: Checked inductivity of 1217 backedges. 192 proven. 177 refuted. 0 times theorem prover too weak. 848 trivial. 0 not checked. [2020-07-20 21:36:45,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2048055321] [2020-07-20 21:36:45,019 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:45,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:45,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167699882] [2020-07-20 21:36:45,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:45,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:45,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:45,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:45,021 INFO L87 Difference]: Start difference. First operand 148 states and 314 transitions. Second operand 15 states. [2020-07-20 21:36:45,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:45,262 INFO L93 Difference]: Finished difference Result 203 states and 459 transitions. [2020-07-20 21:36:45,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:45,264 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 216 [2020-07-20 21:36:45,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:45,267 INFO L225 Difference]: With dead ends: 203 [2020-07-20 21:36:45,268 INFO L226 Difference]: Without dead ends: 166 [2020-07-20 21:36:45,271 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 436 GetRequests, 407 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:45,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-07-20 21:36:45,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 154. [2020-07-20 21:36:45,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2020-07-20 21:36:45,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 320 transitions. [2020-07-20 21:36:45,290 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 320 transitions. Word has length 216 [2020-07-20 21:36:45,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:45,291 INFO L479 AbstractCegarLoop]: Abstraction has 154 states and 320 transitions. [2020-07-20 21:36:45,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:45,291 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 320 transitions. [2020-07-20 21:36:45,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2020-07-20 21:36:45,297 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:45,297 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 11, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:45,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:45,512 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:45,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:45,512 INFO L82 PathProgramCache]: Analyzing trace with hash 519968671, now seen corresponding path program 18 times [2020-07-20 21:36:45,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:45,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1399301034] [2020-07-20 21:36:45,512 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 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:45,730 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:45,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:45,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:45,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:45,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 234 proven. 80 refuted. 0 times theorem prover too weak. 738 trivial. 0 not checked. [2020-07-20 21:36:45,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:46,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:46,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:46,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:46,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:46,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:46,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:46,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:46,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:46,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:46,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:47,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 236 proven. 88 refuted. 0 times theorem prover too weak. 728 trivial. 0 not checked. [2020-07-20 21:36:47,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1399301034] [2020-07-20 21:36:47,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:47,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:47,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394451284] [2020-07-20 21:36:47,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:47,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:47,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:47,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:47,019 INFO L87 Difference]: Start difference. First operand 154 states and 320 transitions. Second operand 15 states. [2020-07-20 21:36:47,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:47,247 INFO L93 Difference]: Finished difference Result 185 states and 377 transitions. [2020-07-20 21:36:47,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:47,247 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 202 [2020-07-20 21:36:47,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:47,250 INFO L225 Difference]: With dead ends: 185 [2020-07-20 21:36:47,251 INFO L226 Difference]: Without dead ends: 178 [2020-07-20 21:36:47,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 379 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:47,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-20 21:36:47,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 149. [2020-07-20 21:36:47,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2020-07-20 21:36:47,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 310 transitions. [2020-07-20 21:36:47,274 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 310 transitions. Word has length 202 [2020-07-20 21:36:47,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:47,274 INFO L479 AbstractCegarLoop]: Abstraction has 149 states and 310 transitions. [2020-07-20 21:36:47,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:47,275 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 310 transitions. [2020-07-20 21:36:47,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2020-07-20 21:36:47,279 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:47,279 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 6, 6, 6, 6, 6, 6, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:47,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:47,495 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:47,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:47,496 INFO L82 PathProgramCache]: Analyzing trace with hash 1590034546, now seen corresponding path program 19 times [2020-07-20 21:36:47,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:47,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1346819461] [2020-07-20 21:36:47,496 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 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:47,797 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:47,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:47,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 21:36:47,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:47,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 112 proven. 239 refuted. 0 times theorem prover too weak. 867 trivial. 0 not checked. [2020-07-20 21:36:47,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:48,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:48,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:49,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:49,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:49,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:49,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:49,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:49,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:49,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 112 proven. 247 refuted. 0 times theorem prover too weak. 859 trivial. 0 not checked. [2020-07-20 21:36:49,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1346819461] [2020-07-20 21:36:49,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:49,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-20 21:36:49,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651182196] [2020-07-20 21:36:49,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:36:49,545 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:49,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:36:49,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:49,546 INFO L87 Difference]: Start difference. First operand 149 states and 310 transitions. Second operand 17 states. [2020-07-20 21:36:49,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:49,862 INFO L93 Difference]: Finished difference Result 200 states and 420 transitions. [2020-07-20 21:36:49,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:36:49,862 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 213 [2020-07-20 21:36:49,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:49,866 INFO L225 Difference]: With dead ends: 200 [2020-07-20 21:36:49,866 INFO L226 Difference]: Without dead ends: 149 [2020-07-20 21:36:49,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 399 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-20 21:36:49,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2020-07-20 21:36:49,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2020-07-20 21:36:49,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2020-07-20 21:36:49,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 299 transitions. [2020-07-20 21:36:49,884 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 299 transitions. Word has length 213 [2020-07-20 21:36:49,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:49,884 INFO L479 AbstractCegarLoop]: Abstraction has 149 states and 299 transitions. [2020-07-20 21:36:49,884 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:36:49,885 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 299 transitions. [2020-07-20 21:36:49,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 21:36:49,889 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:49,889 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 11, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:50,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:50,104 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:50,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:50,105 INFO L82 PathProgramCache]: Analyzing trace with hash 128823812, now seen corresponding path program 20 times [2020-07-20 21:36:50,105 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:50,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [803455151] [2020-07-20 21:36:50,106 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 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:50,347 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:50,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:50,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 21:36:50,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:50,456 INFO L134 CoverageAnalysis]: Checked inductivity of 920 backedges. 151 proven. 154 refuted. 0 times theorem prover too weak. 615 trivial. 0 not checked. [2020-07-20 21:36:50,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:51,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:51,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:51,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:51,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:51,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:51,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:51,863 INFO L134 CoverageAnalysis]: Checked inductivity of 920 backedges. 149 proven. 164 refuted. 0 times theorem prover too weak. 607 trivial. 0 not checked. [2020-07-20 21:36:51,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [803455151] [2020-07-20 21:36:51,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:51,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-20 21:36:51,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846696565] [2020-07-20 21:36:51,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:36:51,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:51,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:36:51,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:51,865 INFO L87 Difference]: Start difference. First operand 149 states and 299 transitions. Second operand 17 states. [2020-07-20 21:36:52,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:52,223 INFO L93 Difference]: Finished difference Result 187 states and 382 transitions. [2020-07-20 21:36:52,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:36:52,224 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 190 [2020-07-20 21:36:52,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:52,227 INFO L225 Difference]: With dead ends: 187 [2020-07-20 21:36:52,227 INFO L226 Difference]: Without dead ends: 155 [2020-07-20 21:36:52,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 353 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-20 21:36:52,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-20 21:36:52,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 146. [2020-07-20 21:36:52,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-07-20 21:36:52,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 286 transitions. [2020-07-20 21:36:52,244 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 286 transitions. Word has length 190 [2020-07-20 21:36:52,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:52,245 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 286 transitions. [2020-07-20 21:36:52,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:36:52,245 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 286 transitions. [2020-07-20 21:36:52,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-20 21:36:52,248 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:52,249 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:52,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:52,462 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:52,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:52,462 INFO L82 PathProgramCache]: Analyzing trace with hash -140375518, now seen corresponding path program 21 times [2020-07-20 21:36:52,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:52,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621003230] [2020-07-20 21:36:52,462 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 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:52,694 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:52,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:52,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 21:36:52,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:52,775 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 211 proven. 43 refuted. 0 times theorem prover too weak. 664 trivial. 0 not checked. [2020-07-20 21:36:52,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:53,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:53,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:53,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:53,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:53,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:53,768 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 210 proven. 48 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2020-07-20 21:36:53,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621003230] [2020-07-20 21:36:53,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:53,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-20 21:36:53,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362669548] [2020-07-20 21:36:53,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:53,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:53,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:53,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:53,771 INFO L87 Difference]: Start difference. First operand 146 states and 286 transitions. Second operand 15 states. [2020-07-20 21:36:53,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:53,986 INFO L93 Difference]: Finished difference Result 165 states and 306 transitions. [2020-07-20 21:36:53,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:53,987 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 189 [2020-07-20 21:36:53,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:53,990 INFO L225 Difference]: With dead ends: 165 [2020-07-20 21:36:53,990 INFO L226 Difference]: Without dead ends: 158 [2020-07-20 21:36:53,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 355 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:36:53,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2020-07-20 21:36:54,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 146. [2020-07-20 21:36:54,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-07-20 21:36:54,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 286 transitions. [2020-07-20 21:36:54,006 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 286 transitions. Word has length 189 [2020-07-20 21:36:54,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:54,006 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 286 transitions. [2020-07-20 21:36:54,006 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:54,007 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 286 transitions. [2020-07-20 21:36:54,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-20 21:36:54,010 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:54,011 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:54,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:54,224 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:54,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:54,224 INFO L82 PathProgramCache]: Analyzing trace with hash -1156996270, now seen corresponding path program 22 times [2020-07-20 21:36:54,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:54,225 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1104021102] [2020-07-20 21:36:54,225 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 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:54,467 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:54,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:54,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 21:36:54,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:54,562 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 234 proven. 69 refuted. 0 times theorem prover too weak. 607 trivial. 0 not checked. [2020-07-20 21:36:54,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:55,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:55,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:55,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:55,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:55,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:55,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:55,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:56,075 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 232 proven. 79 refuted. 0 times theorem prover too weak. 599 trivial. 0 not checked. [2020-07-20 21:36:56,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1104021102] [2020-07-20 21:36:56,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:56,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-20 21:36:56,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149320992] [2020-07-20 21:36:56,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:36:56,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:56,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:36:56,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:56,077 INFO L87 Difference]: Start difference. First operand 146 states and 286 transitions. Second operand 17 states. [2020-07-20 21:36:56,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:56,360 INFO L93 Difference]: Finished difference Result 177 states and 345 transitions. [2020-07-20 21:36:56,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:36:56,361 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 189 [2020-07-20 21:36:56,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:56,364 INFO L225 Difference]: With dead ends: 177 [2020-07-20 21:36:56,364 INFO L226 Difference]: Without dead ends: 170 [2020-07-20 21:36:56,365 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 351 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-20 21:36:56,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2020-07-20 21:36:56,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 133. [2020-07-20 21:36:56,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-07-20 21:36:56,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 251 transitions. [2020-07-20 21:36:56,380 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 251 transitions. Word has length 189 [2020-07-20 21:36:56,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:56,381 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 251 transitions. [2020-07-20 21:36:56,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:36:56,381 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 251 transitions. [2020-07-20 21:36:56,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-20 21:36:56,384 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:56,384 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:56,598 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:56,598 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:56,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:56,599 INFO L82 PathProgramCache]: Analyzing trace with hash 1838391522, now seen corresponding path program 23 times [2020-07-20 21:36:56,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:56,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1406973337] [2020-07-20 21:36:56,599 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 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:56,841 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:56,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:56,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 21:36:56,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:56,953 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 198 proven. 54 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2020-07-20 21:36:56,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:57,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:57,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:57,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:57,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:57,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:57,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:57,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:58,011 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 197 proven. 61 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2020-07-20 21:36:58,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1406973337] [2020-07-20 21:36:58,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:58,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-20 21:36:58,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127782438] [2020-07-20 21:36:58,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:58,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:58,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:58,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:58,014 INFO L87 Difference]: Start difference. First operand 133 states and 251 transitions. Second operand 15 states. [2020-07-20 21:36:58,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:58,245 INFO L93 Difference]: Finished difference Result 168 states and 342 transitions. [2020-07-20 21:36:58,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:58,246 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 189 [2020-07-20 21:36:58,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:58,249 INFO L225 Difference]: With dead ends: 168 [2020-07-20 21:36:58,249 INFO L226 Difference]: Without dead ends: 161 [2020-07-20 21:36:58,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 355 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:36:58,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-07-20 21:36:58,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 120. [2020-07-20 21:36:58,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-20 21:36:58,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 224 transitions. [2020-07-20 21:36:58,261 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 224 transitions. Word has length 189 [2020-07-20 21:36:58,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:58,262 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 224 transitions. [2020-07-20 21:36:58,262 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:58,262 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 224 transitions. [2020-07-20 21:36:58,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-20 21:36:58,265 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:58,265 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:58,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:58,478 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:58,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:58,478 INFO L82 PathProgramCache]: Analyzing trace with hash -1674908912, now seen corresponding path program 24 times [2020-07-20 21:36:58,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:58,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126295699] [2020-07-20 21:36:58,479 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 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:58,745 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:58,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:58,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 21:36:58,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:58,842 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 124 proven. 130 refuted. 0 times theorem prover too weak. 664 trivial. 0 not checked. [2020-07-20 21:36:58,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:59,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:59,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:59,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:59,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:59,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:59,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:59,841 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 125 proven. 133 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2020-07-20 21:36:59,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126295699] [2020-07-20 21:36:59,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:59,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-20 21:36:59,843 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404222582] [2020-07-20 21:36:59,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:59,844 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:59,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:59,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:59,845 INFO L87 Difference]: Start difference. First operand 120 states and 224 transitions. Second operand 15 states. [2020-07-20 21:37:00,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:37:00,103 INFO L93 Difference]: Finished difference Result 161 states and 313 transitions. [2020-07-20 21:37:00,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:37:00,104 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 189 [2020-07-20 21:37:00,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:37:00,107 INFO L225 Difference]: With dead ends: 161 [2020-07-20 21:37:00,107 INFO L226 Difference]: Without dead ends: 129 [2020-07-20 21:37:00,110 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 355 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:37:00,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-07-20 21:37:00,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 107. [2020-07-20 21:37:00,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-20 21:37:00,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 192 transitions. [2020-07-20 21:37:00,125 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 192 transitions. Word has length 189 [2020-07-20 21:37:00,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:37:00,126 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 192 transitions. [2020-07-20 21:37:00,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:37:00,127 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 192 transitions. [2020-07-20 21:37:00,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2020-07-20 21:37:00,130 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:37:00,130 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 11, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:37:00,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:00,345 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:37:00,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:37:00,345 INFO L82 PathProgramCache]: Analyzing trace with hash -2096855727, now seen corresponding path program 25 times [2020-07-20 21:37:00,345 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:37:00,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1017094514] [2020-07-20 21:37:00,346 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 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:00,561 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:37:00,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:37:00,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:37:00,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:37:00,652 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 69 proven. 239 refuted. 0 times theorem prover too weak. 488 trivial. 0 not checked. [2020-07-20 21:37:00,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:37:01,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:01,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:01,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,301 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 73 proven. 251 refuted. 0 times theorem prover too weak. 472 trivial. 0 not checked. [2020-07-20 21:37:02,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1017094514] [2020-07-20 21:37:02,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:37:02,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 21:37:02,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060002552] [2020-07-20 21:37:02,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:37:02,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:37:02,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:37:02,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:37:02,303 INFO L87 Difference]: Start difference. First operand 107 states and 192 transitions. Second operand 17 states. [2020-07-20 21:37:02,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:37:02,639 INFO L93 Difference]: Finished difference Result 168 states and 323 transitions. [2020-07-20 21:37:02,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:37:02,640 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 178 [2020-07-20 21:37:02,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:37:02,642 INFO L225 Difference]: With dead ends: 168 [2020-07-20 21:37:02,642 INFO L226 Difference]: Without dead ends: 104 [2020-07-20 21:37:02,644 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 327 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:37:02,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-07-20 21:37:02,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2020-07-20 21:37:02,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-07-20 21:37:02,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 148 transitions. [2020-07-20 21:37:02,652 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 148 transitions. Word has length 178 [2020-07-20 21:37:02,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:37:02,653 INFO L479 AbstractCegarLoop]: Abstraction has 104 states and 148 transitions. [2020-07-20 21:37:02,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:37:02,653 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 148 transitions. [2020-07-20 21:37:02,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-20 21:37:02,655 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:37:02,655 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:37:02,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:02,870 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:37:02,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:37:02,870 INFO L82 PathProgramCache]: Analyzing trace with hash 1148569106, now seen corresponding path program 26 times [2020-07-20 21:37:02,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:37:02,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1276408711] [2020-07-20 21:37:02,870 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 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:03,130 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:37:03,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:37:03,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 21:37:03,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:37:03,245 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 91 proven. 212 refuted. 0 times theorem prover too weak. 607 trivial. 0 not checked. [2020-07-20 21:37:03,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:37:04,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:04,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:04,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:04,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:04,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:04,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:04,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:04,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:04,706 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 91 proven. 220 refuted. 0 times theorem prover too weak. 599 trivial. 0 not checked. [2020-07-20 21:37:04,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1276408711] [2020-07-20 21:37:04,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:37:04,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-20 21:37:04,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477460892] [2020-07-20 21:37:04,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:37:04,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:37:04,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:37:04,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:37:04,708 INFO L87 Difference]: Start difference. First operand 104 states and 148 transitions. Second operand 17 states. [2020-07-20 21:37:04,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:37:04,976 INFO L93 Difference]: Finished difference Result 152 states and 209 transitions. [2020-07-20 21:37:04,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:37:04,976 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 189 [2020-07-20 21:37:04,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:37:04,978 INFO L225 Difference]: With dead ends: 152 [2020-07-20 21:37:04,978 INFO L226 Difference]: Without dead ends: 104 [2020-07-20 21:37:04,981 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 351 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-20 21:37:04,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-07-20 21:37:04,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 91. [2020-07-20 21:37:04,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-07-20 21:37:04,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 112 transitions. [2020-07-20 21:37:04,988 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 112 transitions. Word has length 189 [2020-07-20 21:37:04,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:37:04,989 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 112 transitions. [2020-07-20 21:37:04,989 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:37:04,989 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 112 transitions. [2020-07-20 21:37:04,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-20 21:37:04,990 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:37:04,991 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:37:05,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:05,205 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:37:05,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:37:05,205 INFO L82 PathProgramCache]: Analyzing trace with hash 1803358882, now seen corresponding path program 27 times [2020-07-20 21:37:05,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:37:05,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1906382610] [2020-07-20 21:37:05,206 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 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:05,476 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:37:05,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:37:05,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 21:37:05,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:37:05,580 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 89 proven. 260 refuted. 0 times theorem prover too weak. 569 trivial. 0 not checked. [2020-07-20 21:37:05,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:37:06,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:06,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:07,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:07,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:07,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:07,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:07,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:07,572 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 87 proven. 276 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2020-07-20 21:37:07,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1906382610] [2020-07-20 21:37:07,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:37:07,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 21:37:07,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132796639] [2020-07-20 21:37:07,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:37:07,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:37:07,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:37:07,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:37:07,574 INFO L87 Difference]: Start difference. First operand 91 states and 112 transitions. Second operand 19 states. [2020-07-20 21:37:07,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:37:07,923 INFO L93 Difference]: Finished difference Result 137 states and 170 transitions. [2020-07-20 21:37:07,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:37:07,924 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 189 [2020-07-20 21:37:07,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:37:07,925 INFO L225 Difference]: With dead ends: 137 [2020-07-20 21:37:07,925 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 21:37:07,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 347 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:37:07,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 21:37:07,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 21:37:07,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 21:37:07,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 21:37:07,929 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 189 [2020-07-20 21:37:07,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:37:07,929 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 21:37:07,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:37:07,929 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 21:37:07,929 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 21:37:08,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:08,134 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 21:37:08,774 WARN L193 SmtUtils]: Spent 370.00 ms on a formula simplification. DAG size of input: 163 DAG size of output: 33 [2020-07-20 21:37:09,034 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 46 [2020-07-20 21:37:09,179 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 32 [2020-07-20 21:37:09,561 WARN L193 SmtUtils]: Spent 380.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 65 [2020-07-20 21:37:09,788 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 46 [2020-07-20 21:37:10,096 WARN L193 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 65 [2020-07-20 21:37:10,373 WARN L193 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 65 [2020-07-20 21:37:10,591 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 33 [2020-07-20 21:37:10,828 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 46 [2020-07-20 21:37:10,980 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 160 DAG size of output: 46 [2020-07-20 21:37:11,364 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 46 [2020-07-20 21:37:11,526 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 33 [2020-07-20 21:37:11,780 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 65 [2020-07-20 21:37:12,336 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 65 [2020-07-20 21:37:12,441 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 46 [2020-07-20 21:37:12,672 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 65 [2020-07-20 21:37:12,778 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 142 DAG size of output: 44 [2020-07-20 21:37:12,887 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 46 [2020-07-20 21:37:13,071 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 65 [2020-07-20 21:37:13,254 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 160 DAG size of output: 46 [2020-07-20 21:37:13,425 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 46 [2020-07-20 21:37:13,677 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 65 [2020-07-20 21:37:13,847 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 65 [2020-07-20 21:37:14,040 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 33 [2020-07-20 21:37:14,166 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 163 DAG size of output: 33 [2020-07-20 21:37:14,332 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 45 [2020-07-20 21:37:14,555 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 69 [2020-07-20 21:37:14,699 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 181 DAG size of output: 66 [2020-07-20 21:37:14,841 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 67 [2020-07-20 21:37:15,076 WARN L193 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 216 DAG size of output: 75 [2020-07-20 21:37:15,325 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 64 [2020-07-20 21:37:15,572 WARN L193 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 216 DAG size of output: 75 [2020-07-20 21:37:15,719 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 67 [2020-07-20 21:37:15,932 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 208 DAG size of output: 64 [2020-07-20 21:37:16,076 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 67 [2020-07-20 21:37:16,334 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 216 DAG size of output: 75 [2020-07-20 21:37:16,457 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 45 [2020-07-20 21:37:16,674 WARN L193 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 64 [2020-07-20 21:37:16,911 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 216 DAG size of output: 75 [2020-07-20 21:37:17,142 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 64 [2020-07-20 21:37:17,351 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 64 [2020-07-20 21:37:17,589 WARN L193 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 216 DAG size of output: 75 [2020-07-20 21:37:17,803 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 208 DAG size of output: 64 [2020-07-20 21:37:18,063 WARN L193 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 41 [2020-07-20 21:37:18,316 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 216 DAG size of output: 75 [2020-07-20 21:37:18,430 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 44 [2020-07-20 21:37:18,584 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 181 DAG size of output: 66 [2020-07-20 21:37:18,783 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 69 [2020-07-20 21:37:18,903 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 45 [2020-07-20 21:37:19,163 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 216 DAG size of output: 75 [2020-07-20 21:37:19,280 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 51 [2020-07-20 21:37:19,447 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 67 [2020-07-20 21:37:19,683 WARN L193 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 216 DAG size of output: 75 [2020-07-20 21:37:19,921 WARN L193 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 216 DAG size of output: 75 [2020-07-20 21:37:20,038 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 51 [2020-07-20 21:37:20,180 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 73 [2020-07-20 21:37:20,301 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 45 [2020-07-20 21:37:20,406 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 44 [2020-07-20 21:37:21,167 WARN L193 SmtUtils]: Spent 728.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 27 [2020-07-20 21:37:21,763 WARN L193 SmtUtils]: Spent 573.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 29 [2020-07-20 21:37:21,767 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 21:37:21,767 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:37:21,767 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:37:21,767 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 21:37:21,768 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 21:37:21,768 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 21:37:21,768 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-07-20 21:37:21,768 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2020-07-20 21:37:21,768 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2020-07-20 21:37:21,768 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2020-07-20 21:37:21,768 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-07-20 21:37:21,768 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-20 21:37:21,769 INFO L264 CegarLoopResult]: At program point L37(line 37) the Hoare annotation is: (and (<= main_~x~0 6) (<= 6 main_~x~0)) [2020-07-20 21:37:21,769 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-07-20 21:37:21,769 INFO L268 CegarLoopResult]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2020-07-20 21:37:21,769 INFO L271 CegarLoopResult]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2020-07-20 21:37:21,769 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (<= 2 |fibo2_#in~n|)) [2020-07-20 21:37:21,769 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-20 21:37:21,770 INFO L264 CegarLoopResult]: At program point L23-2(line 23) the Hoare annotation is: (let ((.cse0 (<= 5 |fibo2_#in~n|)) (.cse1 (<= |fibo2_#in~n| 3))) (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (<= 2 |fibo2_#in~n|) (or .cse0 .cse1 (= 2 |fibo2_#t~ret2|)) (or (and (= 3 |fibo2_#t~ret2|) .cse0) (<= 6 |fibo2_#in~n|) (and (= 1 |fibo2_#t~ret2|) .cse1) (and (<= 4 |fibo2_#in~n|) (<= |fibo2_#in~n| 4))))) [2020-07-20 21:37:21,770 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-20 21:37:21,770 INFO L268 CegarLoopResult]: For program point L23-3(line 23) no Hoare annotation was computed. [2020-07-20 21:37:21,770 INFO L268 CegarLoopResult]: For program point L18(lines 18 24) no Hoare annotation was computed. [2020-07-20 21:37:21,770 INFO L268 CegarLoopResult]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2020-07-20 21:37:21,771 INFO L268 CegarLoopResult]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2020-07-20 21:37:21,771 INFO L271 CegarLoopResult]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2020-07-20 21:37:21,771 INFO L264 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: (and (<= 2 |fibo1_#in~n|) (<= fibo1_~n |fibo1_#in~n|) (<= |fibo1_#in~n| fibo1_~n)) [2020-07-20 21:37:21,771 INFO L268 CegarLoopResult]: For program point L13-1(line 13) no Hoare annotation was computed. [2020-07-20 21:37:21,771 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (let ((.cse1 (<= fibo1_~n |fibo1_#in~n|)) (.cse4 (= 1 |fibo1_#t~ret0|)) (.cse2 (<= |fibo1_#in~n| fibo1_~n))) (let ((.cse0 (and .cse1 (<= 3 |fibo1_#in~n|) .cse4 .cse2 (<= |fibo1_#in~n| 3))) (.cse3 (and (<= 2 |fibo1_#in~n|) .cse1 (<= |fibo1_#in~n| 2) .cse4 .cse2))) (and (or .cse0 (and .cse1 .cse2 (<= 4 |fibo1_#in~n|)) .cse3) (or (= 5 |fibo1_#t~ret0|) (<= 7 |fibo1_#in~n|) (<= |fibo1_#in~n| 5)) (or (<= 5 |fibo1_#in~n|) (= 2 |fibo1_#t~ret0|) .cse0 .cse3)))) [2020-07-20 21:37:21,771 INFO L268 CegarLoopResult]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2020-07-20 21:37:21,772 INFO L268 CegarLoopResult]: For program point L10(lines 10 14) no Hoare annotation was computed. [2020-07-20 21:37:21,772 INFO L268 CegarLoopResult]: For program point L13-3(line 13) no Hoare annotation was computed. [2020-07-20 21:37:21,772 INFO L268 CegarLoopResult]: For program point L8(lines 8 14) no Hoare annotation was computed. [2020-07-20 21:37:21,772 INFO L268 CegarLoopResult]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2020-07-20 21:37:21,777 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:37:21 BoogieIcfgContainer [2020-07-20 21:37:21,778 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 21:37:21,779 INFO L168 Benchmark]: Toolchain (without parser) took 83833.31 ms. Allocated memory was 136.8 MB in the beginning and 900.7 MB in the end (delta: 763.9 MB). Free memory was 102.1 MB in the beginning and 450.0 MB in the end (delta: -347.9 MB). Peak memory consumption was 798.8 MB. Max. memory is 7.1 GB. [2020-07-20 21:37:21,779 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 136.8 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 21:37:21,780 INFO L168 Benchmark]: CACSL2BoogieTranslator took 256.86 ms. Allocated memory is still 136.8 MB. Free memory was 101.6 MB in the beginning and 91.8 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-20 21:37:21,780 INFO L168 Benchmark]: Boogie Preprocessor took 27.22 ms. Allocated memory is still 136.8 MB. Free memory was 91.8 MB in the beginning and 90.2 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 7.1 GB. [2020-07-20 21:37:21,780 INFO L168 Benchmark]: RCFGBuilder took 465.78 ms. Allocated memory was 136.8 MB in the beginning and 201.3 MB in the end (delta: 64.5 MB). Free memory was 90.2 MB in the beginning and 167.7 MB in the end (delta: -77.4 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-20 21:37:21,781 INFO L168 Benchmark]: TraceAbstraction took 83076.45 ms. Allocated memory was 201.3 MB in the beginning and 900.7 MB in the end (delta: 699.4 MB). Free memory was 167.0 MB in the beginning and 450.0 MB in the end (delta: -283.0 MB). Peak memory consumption was 799.2 MB. Max. memory is 7.1 GB. [2020-07-20 21:37:21,782 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 136.8 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 256.86 ms. Allocated memory is still 136.8 MB. Free memory was 101.6 MB in the beginning and 91.8 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 27.22 ms. Allocated memory is still 136.8 MB. Free memory was 91.8 MB in the beginning and 90.2 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 465.78 ms. Allocated memory was 136.8 MB in the beginning and 201.3 MB in the end (delta: 64.5 MB). Free memory was 90.2 MB in the beginning and 167.7 MB in the end (delta: -77.4 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 83076.45 ms. Allocated memory was 201.3 MB in the beginning and 900.7 MB in the end (delta: 699.4 MB). Free memory was 167.0 MB in the beginning and 450.0 MB in the end (delta: -283.0 MB). Peak memory consumption was 799.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 69.3s, OverallIterations: 40, TraceHistogramMax: 18, AutomataDifference: 10.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 13.6s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1190 SDtfs, 1480 SDslu, 8397 SDs, 0 SdLazy, 7594 SolverSat, 1120 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 11685 GetRequests, 10633 SyntacticMatches, 366 SemanticMatches, 686 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2353 ImplicationChecksByTransitivity, 9.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=154occurred in iteration=28, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.5s AutomataMinimizationTime, 40 MinimizatonAttempts, 698 StatesRemovedByMinimization, 34 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 263 PreInvPairs, 6158 NumberOfFragments, 171 HoareAnnotationTreeSize, 263 FomulaSimplifications, 792748718 FormulaSimplificationTreeSizeReduction, 12.2s HoareSimplificationTime, 11 FomulaSimplificationsInter, 20838 FormulaSimplificationTreeSizeReductionInter, 1.3s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 1.4s SatisfiabilityAnalysisTime, 43.8s InterpolantComputationTime, 5778 NumberOfCodeBlocks, 4657 NumberOfCodeBlocksAsserted, 124 NumberOfCheckSat, 11451 ConstructedInterpolants, 0 QuantifiedInterpolants, 3202124 SizeOfPredicates, 209 NumberOfNonLiveVariables, 11318 ConjunctsInSsa, 529 ConjunctsInUnsatCore, 78 InterpolantComputations, 2 PerfectInterpolantSequences, 41564/50210 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 correct! Received shutdown request...