/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 14:29:58,724 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 14:29:58,727 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 14:29:58,748 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 14:29:58,748 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 14:29:58,750 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 14:29:58,753 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 14:29:58,763 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 14:29:58,765 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 14:29:58,767 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 14:29:58,769 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 14:29:58,771 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 14:29:58,771 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 14:29:58,772 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 14:29:58,773 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 14:29:58,776 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 14:29:58,777 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 14:29:58,781 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 14:29:58,783 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 14:29:58,788 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 14:29:58,792 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 14:29:58,793 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 14:29:58,797 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 14:29:58,797 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 14:29:58,802 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 14:29:58,818 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 14:29:58,819 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 14:29:58,821 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 14:29:58,822 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 14:29:58,855 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 14:29:58,855 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 14:29:58,857 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 14:29:58,858 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 14:29:58,858 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 14:29:58,858 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 14:29:58,858 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 14:29:58,858 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 14:29:58,859 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 14:29:58,859 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 14:29:58,860 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 14:29:58,860 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 14:29:58,861 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 14:29:58,861 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 14:29:58,861 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 14:29:58,861 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 14:29:58,862 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 14:29:58,862 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 14:29:58,862 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 14:29:58,862 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 14:29:58,862 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 14:29:58,862 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:29:58,863 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 14:29:58,863 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 14:29:58,863 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 14:29:58,863 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 14:29:58,863 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:58,864 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 14:29:58,864 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 14:29:58,864 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 14:29:59,143 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 14:29:59,159 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 14:29:59,163 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 14:29:59,164 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 14:29:59,165 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 14:29:59,165 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-20 14:29:59,245 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c46449274/587a16224a3f4005be3cb07dc88f688d/FLAGe6eb764ee [2020-07-20 14:29:59,774 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 14:29:59,775 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-20 14:29:59,783 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c46449274/587a16224a3f4005be3cb07dc88f688d/FLAGe6eb764ee [2020-07-20 14:30:00,104 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c46449274/587a16224a3f4005be3cb07dc88f688d [2020-07-20 14:30:00,113 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 14:30:00,117 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 14:30:00,118 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 14:30:00,118 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 14:30:00,122 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 14:30:00,123 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:30:00" (1/1) ... [2020-07-20 14:30:00,126 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@280fe8ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:00, skipping insertion in model container [2020-07-20 14:30:00,126 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:30:00" (1/1) ... [2020-07-20 14:30:00,134 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 14:30:00,153 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 14:30:00,334 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:30:00,338 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 14:30:00,359 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:30:00,375 INFO L208 MainTranslator]: Completed translation [2020-07-20 14:30:00,375 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:00 WrapperNode [2020-07-20 14:30:00,375 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 14:30:00,376 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 14:30:00,376 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 14:30:00,376 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 14:30:00,390 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:00" (1/1) ... [2020-07-20 14:30:00,390 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:00" (1/1) ... [2020-07-20 14:30:00,484 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:00" (1/1) ... [2020-07-20 14:30:00,484 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:00" (1/1) ... [2020-07-20 14:30:00,490 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:00" (1/1) ... [2020-07-20 14:30:00,496 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:00" (1/1) ... [2020-07-20 14:30:00,497 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:00" (1/1) ... [2020-07-20 14:30:00,499 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 14:30:00,499 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 14:30:00,499 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 14:30:00,500 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 14:30:00,501 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:00" (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 14:30:00,561 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 14:30:00,561 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 14:30:00,561 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 14:30:00,561 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 14:30:00,562 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 14:30:00,562 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 14:30:00,562 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 14:30:00,562 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 14:30:00,562 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 14:30:00,562 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 14:30:00,563 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 14:30:00,563 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 14:30:00,563 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 14:30:00,812 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 14:30:00,812 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 14:30:00,817 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:30:00 BoogieIcfgContainer [2020-07-20 14:30:00,817 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 14:30:00,832 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 14:30:00,833 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 14:30:00,838 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 14:30:00,838 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 02:30:00" (1/3) ... [2020-07-20 14:30:00,839 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d386c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:30:00, skipping insertion in model container [2020-07-20 14:30:00,839 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:00" (2/3) ... [2020-07-20 14:30:00,840 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d386c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:30:00, skipping insertion in model container [2020-07-20 14:30:00,840 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:30:00" (3/3) ... [2020-07-20 14:30:00,842 INFO L109 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2020-07-20 14:30:00,853 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 14:30:00,873 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 14:30:00,884 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 14:30:00,907 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 14:30:00,907 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 14:30:00,907 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 14:30:00,907 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 14:30:00,908 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 14:30:00,908 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 14:30:00,908 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 14:30:00,908 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 14:30:00,925 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-20 14:30:00,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 14:30:00,932 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:00,932 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:00,933 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:00,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:00,938 INFO L82 PathProgramCache]: Analyzing trace with hash 317368997, now seen corresponding path program 1 times [2020-07-20 14:30:00,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:00,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562266335] [2020-07-20 14:30:00,945 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 14:30:01,012 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:01,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:01,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 14:30:01,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:01,043 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 14:30:01,043 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:30:01,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562266335] [2020-07-20 14:30:01,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:30:01,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 14:30:01,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425982138] [2020-07-20 14:30:01,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 14:30:01,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:01,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 14:30:01,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 14:30:01,069 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-07-20 14:30:01,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:01,096 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2020-07-20 14:30:01,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 14:30:01,097 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2020-07-20 14:30:01,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:01,107 INFO L225 Difference]: With dead ends: 47 [2020-07-20 14:30:01,107 INFO L226 Difference]: Without dead ends: 22 [2020-07-20 14:30:01,111 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 14:30:01,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-20 14:30:01,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-20 14:30:01,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 14:30:01,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-07-20 14:30:01,151 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 15 [2020-07-20 14:30:01,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:01,151 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-07-20 14:30:01,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 14:30:01,152 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-07-20 14:30:01,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 14:30:01,153 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:01,153 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:01,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:01,368 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:01,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:01,370 INFO L82 PathProgramCache]: Analyzing trace with hash 1632722591, now seen corresponding path program 1 times [2020-07-20 14:30:01,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:01,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [524680264] [2020-07-20 14:30:01,371 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 14:30:01,417 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:01,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:01,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 14:30:01,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:01,466 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:01,497 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 14:30:01,497 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:30:01,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [524680264] [2020-07-20 14:30:01,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:30:01,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 14:30:01,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824508685] [2020-07-20 14:30:01,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 14:30:01,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:01,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 14:30:01,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 14:30:01,505 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 5 states. [2020-07-20 14:30:01,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:01,580 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2020-07-20 14:30:01,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 14:30:01,581 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-20 14:30:01,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:01,582 INFO L225 Difference]: With dead ends: 31 [2020-07-20 14:30:01,582 INFO L226 Difference]: Without dead ends: 29 [2020-07-20 14:30:01,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 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 14:30:01,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-20 14:30:01,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2020-07-20 14:30:01,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 14:30:01,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-07-20 14:30:01,593 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 17 [2020-07-20 14:30:01,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:01,593 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-07-20 14:30:01,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 14:30:01,594 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-07-20 14:30:01,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 14:30:01,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:01,595 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] [2020-07-20 14:30:01,810 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:01,811 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:01,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:01,812 INFO L82 PathProgramCache]: Analyzing trace with hash -1401298672, now seen corresponding path program 1 times [2020-07-20 14:30:01,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:01,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250359539] [2020-07-20 14:30:01,814 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 14:30:01,854 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:01,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:01,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 14:30:01,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:01,913 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:30:01,914 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:30:01,914 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250359539] [2020-07-20 14:30:01,914 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:30:01,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 14:30:01,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393756143] [2020-07-20 14:30:01,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 14:30:01,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:01,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 14:30:01,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-20 14:30:01,917 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states. [2020-07-20 14:30:01,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:01,997 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2020-07-20 14:30:01,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 14:30:01,998 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2020-07-20 14:30:01,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:02,001 INFO L225 Difference]: With dead ends: 49 [2020-07-20 14:30:02,002 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 14:30:02,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-20 14:30:02,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 14:30:02,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2020-07-20 14:30:02,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 14:30:02,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-20 14:30:02,020 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 25 [2020-07-20 14:30:02,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:02,020 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-20 14:30:02,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 14:30:02,020 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-20 14:30:02,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 14:30:02,021 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:02,022 INFO L422 BasicCegarLoop]: trace histogram [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 14:30:02,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:02,236 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:02,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:02,237 INFO L82 PathProgramCache]: Analyzing trace with hash 1107622837, now seen corresponding path program 1 times [2020-07-20 14:30:02,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:02,238 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2131196351] [2020-07-20 14:30:02,238 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 14:30:02,276 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:02,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:02,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 14:30:02,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:02,327 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:30:02,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:02,390 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:30:02,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2131196351] [2020-07-20 14:30:02,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:02,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-20 14:30:02,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954056264] [2020-07-20 14:30:02,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 14:30:02,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:02,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 14:30:02,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-20 14:30:02,394 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2020-07-20 14:30:02,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:02,513 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2020-07-20 14:30:02,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 14:30:02,514 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-20 14:30:02,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:02,515 INFO L225 Difference]: With dead ends: 55 [2020-07-20 14:30:02,516 INFO L226 Difference]: Without dead ends: 40 [2020-07-20 14:30:02,517 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-20 14:30:02,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-20 14:30:02,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2020-07-20 14:30:02,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 14:30:02,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-20 14:30:02,525 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27 [2020-07-20 14:30:02,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:02,525 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-20 14:30:02,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 14:30:02,525 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-20 14:30:02,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 14:30:02,526 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:02,526 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:02,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:02,727 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:02,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:02,728 INFO L82 PathProgramCache]: Analyzing trace with hash -1590427366, now seen corresponding path program 2 times [2020-07-20 14:30:02,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:02,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [788681835] [2020-07-20 14:30:02,729 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 14:30:02,769 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:02,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:02,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 14:30:02,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:02,809 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:02,832 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:30:02,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:02,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:02,900 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:30:02,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [788681835] [2020-07-20 14:30:02,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:02,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-07-20 14:30:02,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738939549] [2020-07-20 14:30:02,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 14:30:02,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:02,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 14:30:02,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-20 14:30:02,906 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 8 states. [2020-07-20 14:30:02,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:02,995 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-07-20 14:30:02,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 14:30:02,996 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-20 14:30:02,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:02,998 INFO L225 Difference]: With dead ends: 51 [2020-07-20 14:30:02,998 INFO L226 Difference]: Without dead ends: 49 [2020-07-20 14:30:03,000 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-20 14:30:03,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-20 14:30:03,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2020-07-20 14:30:03,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-20 14:30:03,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-07-20 14:30:03,012 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 29 [2020-07-20 14:30:03,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:03,012 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-07-20 14:30:03,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 14:30:03,012 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-07-20 14:30:03,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 14:30:03,015 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:03,015 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:03,230 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:03,231 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:03,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:03,232 INFO L82 PathProgramCache]: Analyzing trace with hash -30298372, now seen corresponding path program 3 times [2020-07-20 14:30:03,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:03,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115670752] [2020-07-20 14:30:03,233 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 14:30:03,273 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:03,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:03,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 14:30:03,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:03,334 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 28 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-20 14:30:03,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:03,408 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-07-20 14:30:03,408 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115670752] [2020-07-20 14:30:03,409 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:03,409 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-20 14:30:03,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443599673] [2020-07-20 14:30:03,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 14:30:03,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:03,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 14:30:03,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-07-20 14:30:03,411 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 11 states. [2020-07-20 14:30:03,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:03,524 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2020-07-20 14:30:03,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 14:30:03,525 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-07-20 14:30:03,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:03,527 INFO L225 Difference]: With dead ends: 83 [2020-07-20 14:30:03,528 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 14:30:03,528 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-07-20 14:30:03,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 14:30:03,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2020-07-20 14:30:03,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 14:30:03,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-07-20 14:30:03,538 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 45 [2020-07-20 14:30:03,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:03,538 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-07-20 14:30:03,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 14:30:03,538 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-07-20 14:30:03,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-20 14:30:03,540 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:03,540 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:03,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:03,754 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:03,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:03,755 INFO L82 PathProgramCache]: Analyzing trace with hash 130155809, now seen corresponding path program 4 times [2020-07-20 14:30:03,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:03,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [956199348] [2020-07-20 14:30:03,756 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 14:30:03,807 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:03,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:03,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 14:30:03,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:03,914 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 14:30:03,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:04,008 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 14:30:04,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [956199348] [2020-07-20 14:30:04,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:04,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-20 14:30:04,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111141754] [2020-07-20 14:30:04,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 14:30:04,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:04,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 14:30:04,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2020-07-20 14:30:04,011 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 14 states. [2020-07-20 14:30:04,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:04,207 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2020-07-20 14:30:04,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 14:30:04,208 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 47 [2020-07-20 14:30:04,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:04,214 INFO L225 Difference]: With dead ends: 87 [2020-07-20 14:30:04,215 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 14:30:04,219 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2020-07-20 14:30:04,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 14:30:04,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 48. [2020-07-20 14:30:04,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-20 14:30:04,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-07-20 14:30:04,236 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 47 [2020-07-20 14:30:04,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:04,236 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-07-20 14:30:04,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 14:30:04,237 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-07-20 14:30:04,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 14:30:04,242 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:04,243 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:04,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:04,458 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:04,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:04,459 INFO L82 PathProgramCache]: Analyzing trace with hash -292198906, now seen corresponding path program 5 times [2020-07-20 14:30:04,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:04,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1404645291] [2020-07-20 14:30:04,459 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 14:30:04,508 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:04,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:04,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 14:30:04,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:04,568 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:04,588 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 14:30:04,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:04,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:04,664 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 14:30:04,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1404645291] [2020-07-20 14:30:04,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:04,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-07-20 14:30:04,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707026607] [2020-07-20 14:30:04,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 14:30:04,668 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:04,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 14:30:04,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-07-20 14:30:04,669 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 10 states. [2020-07-20 14:30:04,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:04,784 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2020-07-20 14:30:04,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 14:30:04,785 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 49 [2020-07-20 14:30:04,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:04,786 INFO L225 Difference]: With dead ends: 67 [2020-07-20 14:30:04,787 INFO L226 Difference]: Without dead ends: 65 [2020-07-20 14:30:04,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 81 SyntacticMatches, 8 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 14:30:04,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-20 14:30:04,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2020-07-20 14:30:04,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 14:30:04,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2020-07-20 14:30:04,796 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 49 [2020-07-20 14:30:04,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:04,797 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2020-07-20 14:30:04,797 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 14:30:04,797 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2020-07-20 14:30:04,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 14:30:04,798 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:04,799 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:05,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:05,012 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:05,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:05,013 INFO L82 PathProgramCache]: Analyzing trace with hash 551795688, now seen corresponding path program 6 times [2020-07-20 14:30:05,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:05,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [456751250] [2020-07-20 14:30:05,014 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 14:30:05,053 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:05,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:05,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 14:30:05,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:05,180 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 72 proven. 20 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-20 14:30:05,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:05,322 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 58 proven. 20 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-07-20 14:30:05,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [456751250] [2020-07-20 14:30:05,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:05,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-20 14:30:05,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494790271] [2020-07-20 14:30:05,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 14:30:05,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:05,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 14:30:05,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2020-07-20 14:30:05,325 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 17 states. [2020-07-20 14:30:05,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:05,547 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2020-07-20 14:30:05,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 14:30:05,547 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2020-07-20 14:30:05,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:05,548 INFO L225 Difference]: With dead ends: 115 [2020-07-20 14:30:05,549 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 14:30:05,550 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2020-07-20 14:30:05,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 14:30:05,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2020-07-20 14:30:05,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-20 14:30:05,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2020-07-20 14:30:05,559 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 65 [2020-07-20 14:30:05,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:05,559 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2020-07-20 14:30:05,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 14:30:05,559 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2020-07-20 14:30:05,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 14:30:05,561 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:05,561 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:05,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:05,776 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:05,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:05,777 INFO L82 PathProgramCache]: Analyzing trace with hash -150434419, now seen corresponding path program 7 times [2020-07-20 14:30:05,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:05,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2039102994] [2020-07-20 14:30:05,777 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 14:30:05,826 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:05,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:05,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 14:30:05,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:05,955 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 14:30:05,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:06,101 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 14:30:06,101 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2039102994] [2020-07-20 14:30:06,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:06,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2020-07-20 14:30:06,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20921277] [2020-07-20 14:30:06,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 14:30:06,102 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:06,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 14:30:06,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2020-07-20 14:30:06,103 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand 20 states. [2020-07-20 14:30:06,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:06,365 INFO L93 Difference]: Finished difference Result 119 states and 142 transitions. [2020-07-20 14:30:06,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 14:30:06,365 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2020-07-20 14:30:06,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:06,367 INFO L225 Difference]: With dead ends: 119 [2020-07-20 14:30:06,367 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 14:30:06,368 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 109 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2020-07-20 14:30:06,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 14:30:06,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64. [2020-07-20 14:30:06,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 14:30:06,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2020-07-20 14:30:06,380 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 67 [2020-07-20 14:30:06,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:06,381 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2020-07-20 14:30:06,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 14:30:06,381 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2020-07-20 14:30:06,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 14:30:06,382 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:06,382 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:06,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:06,598 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:06,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:06,598 INFO L82 PathProgramCache]: Analyzing trace with hash -683701774, now seen corresponding path program 8 times [2020-07-20 14:30:06,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:06,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1383357604] [2020-07-20 14:30:06,600 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 14:30:06,646 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:06,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:06,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 14:30:06,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:06,704 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:06,722 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 14:30:06,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:06,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:06,827 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 14:30:06,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1383357604] [2020-07-20 14:30:06,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:06,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-07-20 14:30:06,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836703963] [2020-07-20 14:30:06,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 14:30:06,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:06,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 14:30:06,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-07-20 14:30:06,829 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 12 states. [2020-07-20 14:30:06,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:06,952 INFO L93 Difference]: Finished difference Result 83 states and 90 transitions. [2020-07-20 14:30:06,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 14:30:06,953 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 69 [2020-07-20 14:30:06,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:06,956 INFO L225 Difference]: With dead ends: 83 [2020-07-20 14:30:06,956 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 14:30:06,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 115 SyntacticMatches, 12 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2020-07-20 14:30:06,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 14:30:06,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2020-07-20 14:30:06,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 14:30:06,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2020-07-20 14:30:06,975 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 69 [2020-07-20 14:30:06,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:06,976 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2020-07-20 14:30:06,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 14:30:06,976 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2020-07-20 14:30:06,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-20 14:30:06,978 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:06,978 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:07,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:07,181 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:07,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:07,182 INFO L82 PathProgramCache]: Analyzing trace with hash 192972756, now seen corresponding path program 9 times [2020-07-20 14:30:07,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:07,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628859992] [2020-07-20 14:30:07,183 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 14:30:07,241 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:07,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:07,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 14:30:07,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:07,439 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 132 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-20 14:30:07,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:07,616 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 110 proven. 42 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2020-07-20 14:30:07,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628859992] [2020-07-20 14:30:07,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:07,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 23 [2020-07-20 14:30:07,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477147833] [2020-07-20 14:30:07,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 14:30:07,618 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:07,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 14:30:07,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 14:30:07,619 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 23 states. [2020-07-20 14:30:07,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:07,886 INFO L93 Difference]: Finished difference Result 147 states and 174 transitions. [2020-07-20 14:30:07,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 14:30:07,887 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 85 [2020-07-20 14:30:07,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:07,888 INFO L225 Difference]: With dead ends: 147 [2020-07-20 14:30:07,888 INFO L226 Difference]: Without dead ends: 106 [2020-07-20 14:30:07,890 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 141 SyntacticMatches, 7 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2020-07-20 14:30:07,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-20 14:30:07,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 78. [2020-07-20 14:30:07,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-20 14:30:07,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2020-07-20 14:30:07,898 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 85 [2020-07-20 14:30:07,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:07,898 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2020-07-20 14:30:07,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 14:30:07,899 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2020-07-20 14:30:07,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-07-20 14:30:07,900 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:07,900 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:08,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:08,115 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:08,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:08,116 INFO L82 PathProgramCache]: Analyzing trace with hash 1722356985, now seen corresponding path program 10 times [2020-07-20 14:30:08,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:08,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1748256061] [2020-07-20 14:30:08,117 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 14:30:08,163 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:08,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:08,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 14:30:08,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:08,398 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 14:30:08,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:08,618 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 14:30:08,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1748256061] [2020-07-20 14:30:08,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:08,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2020-07-20 14:30:08,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745303831] [2020-07-20 14:30:08,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 14:30:08,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:08,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 14:30:08,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2020-07-20 14:30:08,623 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 26 states. [2020-07-20 14:30:08,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:08,968 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2020-07-20 14:30:08,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 14:30:08,968 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 87 [2020-07-20 14:30:08,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:08,970 INFO L225 Difference]: With dead ends: 151 [2020-07-20 14:30:08,970 INFO L226 Difference]: Without dead ends: 112 [2020-07-20 14:30:08,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 141 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 14:30:08,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-20 14:30:08,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 80. [2020-07-20 14:30:08,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 14:30:08,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-20 14:30:08,982 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 87 [2020-07-20 14:30:08,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:08,982 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-20 14:30:08,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 14:30:08,983 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-20 14:30:08,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-07-20 14:30:08,987 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:08,987 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:09,201 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:09,202 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:09,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:09,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1713181474, now seen corresponding path program 11 times [2020-07-20 14:30:09,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:09,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480615225] [2020-07-20 14:30:09,204 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 14:30:09,257 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:09,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:09,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 14:30:09,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:09,327 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:09,351 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 14:30:09,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:09,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:09,512 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 14:30:09,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480615225] [2020-07-20 14:30:09,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:09,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-07-20 14:30:09,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695349895] [2020-07-20 14:30:09,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 14:30:09,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:09,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 14:30:09,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-07-20 14:30:09,514 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 14 states. [2020-07-20 14:30:09,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:09,655 INFO L93 Difference]: Finished difference Result 99 states and 107 transitions. [2020-07-20 14:30:09,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 14:30:09,656 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 89 [2020-07-20 14:30:09,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:09,657 INFO L225 Difference]: With dead ends: 99 [2020-07-20 14:30:09,658 INFO L226 Difference]: Without dead ends: 97 [2020-07-20 14:30:09,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 149 SyntacticMatches, 16 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2020-07-20 14:30:09,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-20 14:30:09,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 92. [2020-07-20 14:30:09,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-20 14:30:09,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2020-07-20 14:30:09,670 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 89 [2020-07-20 14:30:09,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:09,671 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2020-07-20 14:30:09,671 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 14:30:09,672 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2020-07-20 14:30:09,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-07-20 14:30:09,673 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:09,673 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:09,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:09,887 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:09,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:09,888 INFO L82 PathProgramCache]: Analyzing trace with hash -1950838080, now seen corresponding path program 12 times [2020-07-20 14:30:09,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:09,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [141971961] [2020-07-20 14:30:09,889 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 14:30:09,936 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:09,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:09,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 14:30:09,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:10,163 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 208 proven. 72 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-20 14:30:10,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:10,414 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 178 proven. 72 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2020-07-20 14:30:10,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [141971961] [2020-07-20 14:30:10,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:10,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2020-07-20 14:30:10,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261231362] [2020-07-20 14:30:10,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 14:30:10,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:10,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 14:30:10,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2020-07-20 14:30:10,417 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand 29 states. [2020-07-20 14:30:10,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:10,837 INFO L93 Difference]: Finished difference Result 179 states and 213 transitions. [2020-07-20 14:30:10,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 14:30:10,837 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 105 [2020-07-20 14:30:10,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:10,839 INFO L225 Difference]: With dead ends: 179 [2020-07-20 14:30:10,839 INFO L226 Difference]: Without dead ends: 130 [2020-07-20 14:30:10,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 173 SyntacticMatches, 9 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 14:30:10,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-07-20 14:30:10,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 94. [2020-07-20 14:30:10,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-20 14:30:10,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2020-07-20 14:30:10,847 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 105 [2020-07-20 14:30:10,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:10,848 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2020-07-20 14:30:10,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 14:30:10,848 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2020-07-20 14:30:10,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-20 14:30:10,849 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:10,849 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:11,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:11,056 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:11,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:11,056 INFO L82 PathProgramCache]: Analyzing trace with hash -734782619, now seen corresponding path program 13 times [2020-07-20 14:30:11,057 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:11,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1731397318] [2020-07-20 14:30:11,057 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 14:30:11,110 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:11,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:11,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 14:30:11,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:11,356 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 14:30:11,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:11,673 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 14:30:11,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1731397318] [2020-07-20 14:30:11,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:11,674 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 32 [2020-07-20 14:30:11,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318753500] [2020-07-20 14:30:11,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-20 14:30:11,675 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:11,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-20 14:30:11,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2020-07-20 14:30:11,676 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand 32 states. [2020-07-20 14:30:12,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:12,146 INFO L93 Difference]: Finished difference Result 183 states and 220 transitions. [2020-07-20 14:30:12,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 14:30:12,146 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 107 [2020-07-20 14:30:12,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:12,147 INFO L225 Difference]: With dead ends: 183 [2020-07-20 14:30:12,148 INFO L226 Difference]: Without dead ends: 136 [2020-07-20 14:30:12,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 173 SyntacticMatches, 10 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 14:30:12,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-20 14:30:12,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 96. [2020-07-20 14:30:12,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-20 14:30:12,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2020-07-20 14:30:12,156 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 107 [2020-07-20 14:30:12,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:12,157 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2020-07-20 14:30:12,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-20 14:30:12,157 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2020-07-20 14:30:12,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 14:30:12,158 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:12,158 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:12,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:12,373 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:12,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:12,374 INFO L82 PathProgramCache]: Analyzing trace with hash -336589110, now seen corresponding path program 14 times [2020-07-20 14:30:12,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:12,374 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1506248561] [2020-07-20 14:30:12,375 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:30:12,430 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:12,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:12,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 14:30:12,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:12,522 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:12,549 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 14:30:12,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:12,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:12,763 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 14:30:12,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1506248561] [2020-07-20 14:30:12,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:12,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-07-20 14:30:12,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702808978] [2020-07-20 14:30:12,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 14:30:12,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:12,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 14:30:12,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-07-20 14:30:12,772 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 16 states. [2020-07-20 14:30:12,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:12,901 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2020-07-20 14:30:12,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 14:30:12,901 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-20 14:30:12,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:12,903 INFO L225 Difference]: With dead ends: 115 [2020-07-20 14:30:12,903 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 14:30:12,903 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 183 SyntacticMatches, 20 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=99, Invalid=173, Unknown=0, NotChecked=0, Total=272 [2020-07-20 14:30:12,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 14:30:12,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 108. [2020-07-20 14:30:12,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-20 14:30:12,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 116 transitions. [2020-07-20 14:30:12,910 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 116 transitions. Word has length 109 [2020-07-20 14:30:12,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:12,911 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 116 transitions. [2020-07-20 14:30:12,911 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 14:30:12,911 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 116 transitions. [2020-07-20 14:30:12,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-20 14:30:12,913 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:12,913 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:13,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:13,129 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:13,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:13,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1711037612, now seen corresponding path program 15 times [2020-07-20 14:30:13,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:13,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562467597] [2020-07-20 14:30:13,131 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 14:30:13,187 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:13,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:13,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 14:30:13,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:13,490 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 300 proven. 110 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-20 14:30:13,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:13,856 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 262 proven. 110 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-20 14:30:13,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562467597] [2020-07-20 14:30:13,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:13,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 35 [2020-07-20 14:30:13,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599038803] [2020-07-20 14:30:13,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 14:30:13,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:13,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 14:30:13,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=892, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 14:30:13,859 INFO L87 Difference]: Start difference. First operand 108 states and 116 transitions. Second operand 35 states. [2020-07-20 14:30:14,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:14,352 INFO L93 Difference]: Finished difference Result 211 states and 252 transitions. [2020-07-20 14:30:14,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 14:30:14,352 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 125 [2020-07-20 14:30:14,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:14,354 INFO L225 Difference]: With dead ends: 211 [2020-07-20 14:30:14,354 INFO L226 Difference]: Without dead ends: 154 [2020-07-20 14:30:14,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 205 SyntacticMatches, 11 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 14:30:14,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-20 14:30:14,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 110. [2020-07-20 14:30:14,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 14:30:14,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 118 transitions. [2020-07-20 14:30:14,362 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 118 transitions. Word has length 125 [2020-07-20 14:30:14,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:14,363 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 118 transitions. [2020-07-20 14:30:14,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 14:30:14,363 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 118 transitions. [2020-07-20 14:30:14,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-20 14:30:14,364 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:14,364 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:14,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:14,578 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:14,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:14,579 INFO L82 PathProgramCache]: Analyzing trace with hash 66724049, now seen corresponding path program 16 times [2020-07-20 14:30:14,579 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:14,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1972370485] [2020-07-20 14:30:14,580 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 14:30:14,636 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:14,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:14,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 14:30:14,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:15,009 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 14:30:15,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:15,436 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 14:30:15,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1972370485] [2020-07-20 14:30:15,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:15,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 38 [2020-07-20 14:30:15,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069962661] [2020-07-20 14:30:15,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-20 14:30:15,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:15,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-20 14:30:15,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 14:30:15,443 INFO L87 Difference]: Start difference. First operand 110 states and 118 transitions. Second operand 38 states. [2020-07-20 14:30:15,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:15,981 INFO L93 Difference]: Finished difference Result 215 states and 259 transitions. [2020-07-20 14:30:15,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 14:30:15,982 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 127 [2020-07-20 14:30:15,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:15,986 INFO L225 Difference]: With dead ends: 215 [2020-07-20 14:30:15,986 INFO L226 Difference]: Without dead ends: 160 [2020-07-20 14:30:15,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 205 SyntacticMatches, 12 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 14:30:15,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-07-20 14:30:15,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 112. [2020-07-20 14:30:15,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-20 14:30:15,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2020-07-20 14:30:15,995 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 127 [2020-07-20 14:30:15,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:15,995 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2020-07-20 14:30:15,995 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-20 14:30:15,996 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2020-07-20 14:30:15,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-07-20 14:30:15,997 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:15,997 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:16,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:16,212 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:16,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:16,213 INFO L82 PathProgramCache]: Analyzing trace with hash 429354934, now seen corresponding path program 17 times [2020-07-20 14:30:16,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:16,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [866167206] [2020-07-20 14:30:16,214 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 14:30:16,281 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:16,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:16,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 14:30:16,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:16,427 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:16,461 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 14:30:16,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:16,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:16,737 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 14:30:16,738 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [866167206] [2020-07-20 14:30:16,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:16,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-07-20 14:30:16,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331438054] [2020-07-20 14:30:16,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 14:30:16,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:16,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 14:30:16,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-07-20 14:30:16,740 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand 18 states. [2020-07-20 14:30:16,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:16,905 INFO L93 Difference]: Finished difference Result 131 states and 141 transitions. [2020-07-20 14:30:16,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 14:30:16,908 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 129 [2020-07-20 14:30:16,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:16,910 INFO L225 Difference]: With dead ends: 131 [2020-07-20 14:30:16,911 INFO L226 Difference]: Without dead ends: 129 [2020-07-20 14:30:16,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 217 SyntacticMatches, 24 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=214, Unknown=0, NotChecked=0, Total=342 [2020-07-20 14:30:16,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-07-20 14:30:16,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 124. [2020-07-20 14:30:16,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-20 14:30:16,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2020-07-20 14:30:16,927 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 129 [2020-07-20 14:30:16,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:16,927 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2020-07-20 14:30:16,928 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 14:30:16,928 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2020-07-20 14:30:16,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-20 14:30:16,929 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:16,930 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:17,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:17,145 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:17,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:17,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1971086744, now seen corresponding path program 18 times [2020-07-20 14:30:17,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:17,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [280757533] [2020-07-20 14:30:17,146 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 14:30:17,229 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:17,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:17,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 14:30:17,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:17,649 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 408 proven. 156 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-20 14:30:17,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:18,151 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 362 proven. 156 refuted. 0 times theorem prover too weak. 314 trivial. 0 not checked. [2020-07-20 14:30:18,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [280757533] [2020-07-20 14:30:18,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:18,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 41 [2020-07-20 14:30:18,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152658051] [2020-07-20 14:30:18,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-20 14:30:18,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:18,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-20 14:30:18,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 14:30:18,156 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand 41 states. [2020-07-20 14:30:18,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:18,811 INFO L93 Difference]: Finished difference Result 243 states and 291 transitions. [2020-07-20 14:30:18,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 14:30:18,812 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 145 [2020-07-20 14:30:18,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:18,813 INFO L225 Difference]: With dead ends: 243 [2020-07-20 14:30:18,813 INFO L226 Difference]: Without dead ends: 178 [2020-07-20 14:30:18,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 237 SyntacticMatches, 13 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=781, Invalid=2081, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 14:30:18,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-20 14:30:18,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 126. [2020-07-20 14:30:18,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-07-20 14:30:18,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 135 transitions. [2020-07-20 14:30:18,823 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 135 transitions. Word has length 145 [2020-07-20 14:30:18,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:18,823 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 135 transitions. [2020-07-20 14:30:18,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-20 14:30:18,823 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 135 transitions. [2020-07-20 14:30:18,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2020-07-20 14:30:18,825 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:18,825 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:19,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:19,032 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:19,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:19,033 INFO L82 PathProgramCache]: Analyzing trace with hash 554411325, now seen corresponding path program 19 times [2020-07-20 14:30:19,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:19,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2002690614] [2020-07-20 14:30:19,034 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 14:30:19,096 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:19,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:19,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 14:30:19,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:19,546 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 14:30:19,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:20,075 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 14:30:20,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2002690614] [2020-07-20 14:30:20,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:20,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 44 [2020-07-20 14:30:20,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096936540] [2020-07-20 14:30:20,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-20 14:30:20,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:20,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-20 14:30:20,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 14:30:20,077 INFO L87 Difference]: Start difference. First operand 126 states and 135 transitions. Second operand 44 states. [2020-07-20 14:30:20,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:20,769 INFO L93 Difference]: Finished difference Result 247 states and 298 transitions. [2020-07-20 14:30:20,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 14:30:20,770 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 147 [2020-07-20 14:30:20,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:20,772 INFO L225 Difference]: With dead ends: 247 [2020-07-20 14:30:20,772 INFO L226 Difference]: Without dead ends: 184 [2020-07-20 14:30:20,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 237 SyntacticMatches, 14 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=897, Invalid=2409, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 14:30:20,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-07-20 14:30:20,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 128. [2020-07-20 14:30:20,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-07-20 14:30:20,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2020-07-20 14:30:20,782 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 147 [2020-07-20 14:30:20,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:20,782 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2020-07-20 14:30:20,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-20 14:30:20,782 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2020-07-20 14:30:20,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-20 14:30:20,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:20,784 INFO L422 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:20,995 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:20,995 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:20,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:20,996 INFO L82 PathProgramCache]: Analyzing trace with hash 633966498, now seen corresponding path program 20 times [2020-07-20 14:30:20,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:20,996 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [652987112] [2020-07-20 14:30:20,996 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 14:30:21,069 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:21,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:21,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-20 14:30:21,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:21,224 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:21,267 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 14:30:21,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:21,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:21,587 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 14:30:21,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [652987112] [2020-07-20 14:30:21,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:21,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-07-20 14:30:21,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936563047] [2020-07-20 14:30:21,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 14:30:21,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:21,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 14:30:21,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2020-07-20 14:30:21,590 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand 20 states. [2020-07-20 14:30:21,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:21,799 INFO L93 Difference]: Finished difference Result 147 states and 158 transitions. [2020-07-20 14:30:21,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 14:30:21,799 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 149 [2020-07-20 14:30:21,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:21,801 INFO L225 Difference]: With dead ends: 147 [2020-07-20 14:30:21,801 INFO L226 Difference]: Without dead ends: 145 [2020-07-20 14:30:21,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 251 SyntacticMatches, 28 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=161, Invalid=259, Unknown=0, NotChecked=0, Total=420 [2020-07-20 14:30:21,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2020-07-20 14:30:21,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 140. [2020-07-20 14:30:21,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-20 14:30:21,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 150 transitions. [2020-07-20 14:30:21,809 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 150 transitions. Word has length 149 [2020-07-20 14:30:21,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:21,810 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 150 transitions. [2020-07-20 14:30:21,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 14:30:21,810 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 150 transitions. [2020-07-20 14:30:21,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2020-07-20 14:30:21,811 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:21,811 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:22,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:22,025 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:22,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:22,025 INFO L82 PathProgramCache]: Analyzing trace with hash -869716604, now seen corresponding path program 21 times [2020-07-20 14:30:22,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:22,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838025274] [2020-07-20 14:30:22,026 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 14:30:22,101 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:22,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:22,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 14:30:22,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:22,615 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 532 proven. 210 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-20 14:30:22,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:23,214 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 478 proven. 210 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-20 14:30:23,214 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838025274] [2020-07-20 14:30:23,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:23,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 47 [2020-07-20 14:30:23,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061472411] [2020-07-20 14:30:23,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-20 14:30:23,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:23,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-20 14:30:23,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 14:30:23,216 INFO L87 Difference]: Start difference. First operand 140 states and 150 transitions. Second operand 47 states. [2020-07-20 14:30:24,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:24,087 INFO L93 Difference]: Finished difference Result 275 states and 330 transitions. [2020-07-20 14:30:24,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-20 14:30:24,087 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 165 [2020-07-20 14:30:24,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:24,089 INFO L225 Difference]: With dead ends: 275 [2020-07-20 14:30:24,089 INFO L226 Difference]: Without dead ends: 202 [2020-07-20 14:30:24,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 269 SyntacticMatches, 15 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1021, Invalid=2761, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 14:30:24,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-20 14:30:24,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 142. [2020-07-20 14:30:24,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-20 14:30:24,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 152 transitions. [2020-07-20 14:30:24,100 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 152 transitions. Word has length 165 [2020-07-20 14:30:24,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:24,100 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 152 transitions. [2020-07-20 14:30:24,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-20 14:30:24,100 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 152 transitions. [2020-07-20 14:30:24,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2020-07-20 14:30:24,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:24,102 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:24,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:24,317 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:24,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:24,318 INFO L82 PathProgramCache]: Analyzing trace with hash -583456599, now seen corresponding path program 22 times [2020-07-20 14:30:24,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:24,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1263649940] [2020-07-20 14:30:24,319 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 14:30:24,399 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:24,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:24,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 396 conjuncts, 34 conjunts are in the unsatisfiable core [2020-07-20 14:30:24,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:24,997 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 14:30:24,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:25,665 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 14:30:25,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1263649940] [2020-07-20 14:30:25,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:25,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 50 [2020-07-20 14:30:25,666 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410653401] [2020-07-20 14:30:25,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 14:30:25,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:25,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 14:30:25,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 14:30:25,668 INFO L87 Difference]: Start difference. First operand 142 states and 152 transitions. Second operand 50 states. [2020-07-20 14:30:26,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:26,620 INFO L93 Difference]: Finished difference Result 279 states and 337 transitions. [2020-07-20 14:30:26,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 14:30:26,621 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 167 [2020-07-20 14:30:26,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:26,623 INFO L225 Difference]: With dead ends: 279 [2020-07-20 14:30:26,623 INFO L226 Difference]: Without dead ends: 208 [2020-07-20 14:30:26,631 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 269 SyntacticMatches, 16 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1153, Invalid=3137, Unknown=0, NotChecked=0, Total=4290 [2020-07-20 14:30:26,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-20 14:30:26,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 144. [2020-07-20 14:30:26,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 14:30:26,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 154 transitions. [2020-07-20 14:30:26,644 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 154 transitions. Word has length 167 [2020-07-20 14:30:26,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:26,644 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 154 transitions. [2020-07-20 14:30:26,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-20 14:30:26,645 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 154 transitions. [2020-07-20 14:30:26,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-20 14:30:26,647 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:26,647 INFO L422 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:26,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:26,862 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:26,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:26,862 INFO L82 PathProgramCache]: Analyzing trace with hash -365498738, now seen corresponding path program 23 times [2020-07-20 14:30:26,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:26,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1031863723] [2020-07-20 14:30:26,863 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 14:30:26,981 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:26,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:26,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 14:30:26,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:27,153 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:27,197 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 14:30:27,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:27,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:27,599 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 14:30:27,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1031863723] [2020-07-20 14:30:27,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:27,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-07-20 14:30:27,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54114421] [2020-07-20 14:30:27,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 14:30:27,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:27,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 14:30:27,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2020-07-20 14:30:27,601 INFO L87 Difference]: Start difference. First operand 144 states and 154 transitions. Second operand 22 states. [2020-07-20 14:30:27,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:27,813 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2020-07-20 14:30:27,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 14:30:27,814 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 169 [2020-07-20 14:30:27,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:27,815 INFO L225 Difference]: With dead ends: 163 [2020-07-20 14:30:27,816 INFO L226 Difference]: Without dead ends: 161 [2020-07-20 14:30:27,816 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 285 SyntacticMatches, 32 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=198, Invalid=308, Unknown=0, NotChecked=0, Total=506 [2020-07-20 14:30:27,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-07-20 14:30:27,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 156. [2020-07-20 14:30:27,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-20 14:30:27,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 167 transitions. [2020-07-20 14:30:27,826 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 167 transitions. Word has length 169 [2020-07-20 14:30:27,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:27,826 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 167 transitions. [2020-07-20 14:30:27,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 14:30:27,826 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 167 transitions. [2020-07-20 14:30:27,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2020-07-20 14:30:27,828 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:27,828 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:28,043 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:28,044 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:28,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:28,045 INFO L82 PathProgramCache]: Analyzing trace with hash -760007568, now seen corresponding path program 24 times [2020-07-20 14:30:28,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:28,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [817330843] [2020-07-20 14:30:28,046 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 14:30:28,154 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:28,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:28,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 436 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-20 14:30:28,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:28,913 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 672 proven. 272 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-07-20 14:30:28,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:29,668 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 610 proven. 272 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2020-07-20 14:30:29,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [817330843] [2020-07-20 14:30:29,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:29,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 53 [2020-07-20 14:30:29,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821599876] [2020-07-20 14:30:29,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-20 14:30:29,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:29,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-20 14:30:29,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2020-07-20 14:30:29,670 INFO L87 Difference]: Start difference. First operand 156 states and 167 transitions. Second operand 53 states. [2020-07-20 14:30:30,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:30,743 INFO L93 Difference]: Finished difference Result 307 states and 369 transitions. [2020-07-20 14:30:30,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 14:30:30,744 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 185 [2020-07-20 14:30:30,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:30,745 INFO L225 Difference]: With dead ends: 307 [2020-07-20 14:30:30,745 INFO L226 Difference]: Without dead ends: 226 [2020-07-20 14:30:30,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 301 SyntacticMatches, 17 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1208 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1293, Invalid=3537, Unknown=0, NotChecked=0, Total=4830 [2020-07-20 14:30:30,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-20 14:30:30,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 158. [2020-07-20 14:30:30,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-07-20 14:30:30,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 169 transitions. [2020-07-20 14:30:30,761 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 169 transitions. Word has length 185 [2020-07-20 14:30:30,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:30,761 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 169 transitions. [2020-07-20 14:30:30,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-20 14:30:30,761 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 169 transitions. [2020-07-20 14:30:30,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-20 14:30:30,763 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:30,763 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:30,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:30,978 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:30,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:30,979 INFO L82 PathProgramCache]: Analyzing trace with hash -1861014763, now seen corresponding path program 25 times [2020-07-20 14:30:30,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:30,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153014302] [2020-07-20 14:30:30,980 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 14:30:31,061 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:31,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:31,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 444 conjuncts, 38 conjunts are in the unsatisfiable core [2020-07-20 14:30:31,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:31,780 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 14:30:31,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:32,646 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 14:30:32,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153014302] [2020-07-20 14:30:32,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:32,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 56 [2020-07-20 14:30:32,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888028939] [2020-07-20 14:30:32,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-20 14:30:32,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:32,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-20 14:30:32,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2341, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 14:30:32,649 INFO L87 Difference]: Start difference. First operand 158 states and 169 transitions. Second operand 56 states. [2020-07-20 14:30:33,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:33,716 INFO L93 Difference]: Finished difference Result 311 states and 376 transitions. [2020-07-20 14:30:33,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 14:30:33,716 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 187 [2020-07-20 14:30:33,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:33,718 INFO L225 Difference]: With dead ends: 311 [2020-07-20 14:30:33,718 INFO L226 Difference]: Without dead ends: 232 [2020-07-20 14:30:33,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 301 SyntacticMatches, 18 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1441, Invalid=3961, Unknown=0, NotChecked=0, Total=5402 [2020-07-20 14:30:33,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-20 14:30:33,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 160. [2020-07-20 14:30:33,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-20 14:30:33,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 171 transitions. [2020-07-20 14:30:33,735 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 171 transitions. Word has length 187 [2020-07-20 14:30:33,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:33,735 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 171 transitions. [2020-07-20 14:30:33,735 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-20 14:30:33,735 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 171 transitions. [2020-07-20 14:30:33,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-20 14:30:33,737 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:33,738 INFO L422 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:33,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:33,951 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:33,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:33,952 INFO L82 PathProgramCache]: Analyzing trace with hash 927992954, now seen corresponding path program 26 times [2020-07-20 14:30:33,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:33,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1017902334] [2020-07-20 14:30:33,953 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 14:30:34,040 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:34,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:34,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-20 14:30:34,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:34,295 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:34,378 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 14:30:34,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:34,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:34,974 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 14:30:34,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1017902334] [2020-07-20 14:30:34,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:34,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-07-20 14:30:34,975 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980787218] [2020-07-20 14:30:34,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 14:30:34,976 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:34,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 14:30:34,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2020-07-20 14:30:34,979 INFO L87 Difference]: Start difference. First operand 160 states and 171 transitions. Second operand 24 states. [2020-07-20 14:30:35,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:35,218 INFO L93 Difference]: Finished difference Result 179 states and 192 transitions. [2020-07-20 14:30:35,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 14:30:35,219 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 189 [2020-07-20 14:30:35,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:35,221 INFO L225 Difference]: With dead ends: 179 [2020-07-20 14:30:35,221 INFO L226 Difference]: Without dead ends: 177 [2020-07-20 14:30:35,222 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 319 SyntacticMatches, 36 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=239, Invalid=361, Unknown=0, NotChecked=0, Total=600 [2020-07-20 14:30:35,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-07-20 14:30:35,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 172. [2020-07-20 14:30:35,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-07-20 14:30:35,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 184 transitions. [2020-07-20 14:30:35,241 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 184 transitions. Word has length 189 [2020-07-20 14:30:35,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:35,243 INFO L479 AbstractCegarLoop]: Abstraction has 172 states and 184 transitions. [2020-07-20 14:30:35,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 14:30:35,243 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 184 transitions. [2020-07-20 14:30:35,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-20 14:30:35,246 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:35,246 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:35,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:35,461 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:35,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:35,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1753938524, now seen corresponding path program 27 times [2020-07-20 14:30:35,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:35,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [591609182] [2020-07-20 14:30:35,462 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 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 14:30:35,546 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:35,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:35,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-20 14:30:35,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:36,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 828 proven. 342 refuted. 0 times theorem prover too weak. 616 trivial. 0 not checked. [2020-07-20 14:30:36,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:37,282 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 758 proven. 342 refuted. 0 times theorem prover too weak. 686 trivial. 0 not checked. [2020-07-20 14:30:37,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [591609182] [2020-07-20 14:30:37,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:37,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 59 [2020-07-20 14:30:37,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737924888] [2020-07-20 14:30:37,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-20 14:30:37,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:37,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-20 14:30:37,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2020-07-20 14:30:37,284 INFO L87 Difference]: Start difference. First operand 172 states and 184 transitions. Second operand 59 states. [2020-07-20 14:30:38,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:38,477 INFO L93 Difference]: Finished difference Result 339 states and 408 transitions. [2020-07-20 14:30:38,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 14:30:38,477 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 205 [2020-07-20 14:30:38,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:38,480 INFO L225 Difference]: With dead ends: 339 [2020-07-20 14:30:38,480 INFO L226 Difference]: Without dead ends: 250 [2020-07-20 14:30:38,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 333 SyntacticMatches, 19 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1521 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1597, Invalid=4409, Unknown=0, NotChecked=0, Total=6006 [2020-07-20 14:30:38,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-20 14:30:38,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 174. [2020-07-20 14:30:38,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-20 14:30:38,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 186 transitions. [2020-07-20 14:30:38,499 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 186 transitions. Word has length 205 [2020-07-20 14:30:38,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:38,499 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 186 transitions. [2020-07-20 14:30:38,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-20 14:30:38,499 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 186 transitions. [2020-07-20 14:30:38,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2020-07-20 14:30:38,502 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:38,503 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:38,718 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:38,718 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:38,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:38,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1542073473, now seen corresponding path program 28 times [2020-07-20 14:30:38,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:38,718 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [674947212] [2020-07-20 14:30:38,719 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 14:30:38,805 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:38,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:38,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 42 conjunts are in the unsatisfiable core [2020-07-20 14:30:38,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:39,739 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 14:30:39,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:40,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 14:30:40,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [674947212] [2020-07-20 14:30:40,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:40,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 62 [2020-07-20 14:30:40,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783455539] [2020-07-20 14:30:40,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-07-20 14:30:40,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:40,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-07-20 14:30:40,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2881, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 14:30:40,850 INFO L87 Difference]: Start difference. First operand 174 states and 186 transitions. Second operand 62 states. [2020-07-20 14:30:42,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:42,208 INFO L93 Difference]: Finished difference Result 343 states and 415 transitions. [2020-07-20 14:30:42,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-20 14:30:42,208 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 207 [2020-07-20 14:30:42,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:42,210 INFO L225 Difference]: With dead ends: 343 [2020-07-20 14:30:42,210 INFO L226 Difference]: Without dead ends: 256 [2020-07-20 14:30:42,211 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 333 SyntacticMatches, 20 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1691 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1761, Invalid=4881, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 14:30:42,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-20 14:30:42,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 176. [2020-07-20 14:30:42,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 14:30:42,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 188 transitions. [2020-07-20 14:30:42,221 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 188 transitions. Word has length 207 [2020-07-20 14:30:42,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:42,221 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 188 transitions. [2020-07-20 14:30:42,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-07-20 14:30:42,221 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 188 transitions. [2020-07-20 14:30:42,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2020-07-20 14:30:42,223 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:42,223 INFO L422 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:42,437 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:42,438 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:42,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:42,439 INFO L82 PathProgramCache]: Analyzing trace with hash -196777626, now seen corresponding path program 29 times [2020-07-20 14:30:42,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:42,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [393069163] [2020-07-20 14:30:42,439 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 14:30:42,529 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:42,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:42,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-20 14:30:42,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:42,827 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:42,880 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 14:30:42,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:42,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:43,485 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 14:30:43,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [393069163] [2020-07-20 14:30:43,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:43,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-07-20 14:30:43,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252271162] [2020-07-20 14:30:43,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 14:30:43,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:43,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 14:30:43,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=370, Unknown=0, NotChecked=0, Total=650 [2020-07-20 14:30:43,488 INFO L87 Difference]: Start difference. First operand 176 states and 188 transitions. Second operand 26 states. [2020-07-20 14:30:43,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:43,787 INFO L93 Difference]: Finished difference Result 195 states and 209 transitions. [2020-07-20 14:30:43,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 14:30:43,788 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 209 [2020-07-20 14:30:43,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:43,789 INFO L225 Difference]: With dead ends: 195 [2020-07-20 14:30:43,789 INFO L226 Difference]: Without dead ends: 193 [2020-07-20 14:30:43,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 353 SyntacticMatches, 40 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=284, Invalid=418, Unknown=0, NotChecked=0, Total=702 [2020-07-20 14:30:43,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2020-07-20 14:30:43,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 188. [2020-07-20 14:30:43,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-20 14:30:43,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 201 transitions. [2020-07-20 14:30:43,800 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 201 transitions. Word has length 209 [2020-07-20 14:30:43,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:43,801 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 201 transitions. [2020-07-20 14:30:43,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 14:30:43,801 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 201 transitions. [2020-07-20 14:30:43,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-20 14:30:43,803 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:43,803 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 21, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:44,016 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:44,017 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:44,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:44,017 INFO L82 PathProgramCache]: Analyzing trace with hash 65077064, now seen corresponding path program 30 times [2020-07-20 14:30:44,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:44,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [5534544] [2020-07-20 14:30:44,018 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 14:30:44,111 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:44,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:44,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 532 conjuncts, 44 conjunts are in the unsatisfiable core [2020-07-20 14:30:44,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:45,112 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 1000 proven. 420 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2020-07-20 14:30:45,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:46,239 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 922 proven. 420 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2020-07-20 14:30:46,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [5534544] [2020-07-20 14:30:46,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:46,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 65 [2020-07-20 14:30:46,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117456637] [2020-07-20 14:30:46,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-20 14:30:46,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:46,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-20 14:30:46,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2020-07-20 14:30:46,242 INFO L87 Difference]: Start difference. First operand 188 states and 201 transitions. Second operand 65 states. [2020-07-20 14:30:47,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:47,651 INFO L93 Difference]: Finished difference Result 371 states and 447 transitions. [2020-07-20 14:30:47,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-20 14:30:47,651 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 225 [2020-07-20 14:30:47,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:47,653 INFO L225 Difference]: With dead ends: 371 [2020-07-20 14:30:47,653 INFO L226 Difference]: Without dead ends: 274 [2020-07-20 14:30:47,655 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 365 SyntacticMatches, 21 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1870 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1933, Invalid=5377, Unknown=0, NotChecked=0, Total=7310 [2020-07-20 14:30:47,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-20 14:30:47,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 190. [2020-07-20 14:30:47,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 14:30:47,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions. [2020-07-20 14:30:47,665 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 225 [2020-07-20 14:30:47,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:47,665 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 203 transitions. [2020-07-20 14:30:47,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-20 14:30:47,666 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions. [2020-07-20 14:30:47,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2020-07-20 14:30:47,667 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:47,667 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:47,880 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:47,881 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:47,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:47,882 INFO L82 PathProgramCache]: Analyzing trace with hash 1137618157, now seen corresponding path program 31 times [2020-07-20 14:30:47,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:47,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [901704611] [2020-07-20 14:30:47,882 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 14:30:47,975 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:47,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:47,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-20 14:30:47,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:49,058 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 14:30:49,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:50,316 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 14:30:50,316 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [901704611] [2020-07-20 14:30:50,316 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:50,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46] total 68 [2020-07-20 14:30:50,317 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22110623] [2020-07-20 14:30:50,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-20 14:30:50,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:50,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-20 14:30:50,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=3477, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 14:30:50,318 INFO L87 Difference]: Start difference. First operand 190 states and 203 transitions. Second operand 68 states. [2020-07-20 14:30:51,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:51,843 INFO L93 Difference]: Finished difference Result 375 states and 454 transitions. [2020-07-20 14:30:51,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-20 14:30:51,844 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 227 [2020-07-20 14:30:51,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:51,845 INFO L225 Difference]: With dead ends: 375 [2020-07-20 14:30:51,845 INFO L226 Difference]: Without dead ends: 280 [2020-07-20 14:30:51,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 365 SyntacticMatches, 22 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2113, Invalid=5897, Unknown=0, NotChecked=0, Total=8010 [2020-07-20 14:30:51,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-20 14:30:51,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 192. [2020-07-20 14:30:51,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-20 14:30:51,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 205 transitions. [2020-07-20 14:30:51,857 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 205 transitions. Word has length 227 [2020-07-20 14:30:51,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:51,858 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 205 transitions. [2020-07-20 14:30:51,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-20 14:30:51,858 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 205 transitions. [2020-07-20 14:30:51,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2020-07-20 14:30:51,859 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:51,860 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:52,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:52,069 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:52,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:52,070 INFO L82 PathProgramCache]: Analyzing trace with hash 1057457490, now seen corresponding path program 32 times [2020-07-20 14:30:52,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:52,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1915477441] [2020-07-20 14:30:52,070 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 14:30:52,170 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:52,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:52,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-20 14:30:52,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:52,525 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:52,598 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 14:30:52,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:52,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:53,359 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 14:30:53,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1915477441] [2020-07-20 14:30:53,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:53,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-07-20 14:30:53,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373200955] [2020-07-20 14:30:53,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 14:30:53,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:53,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 14:30:53,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=427, Unknown=0, NotChecked=0, Total=756 [2020-07-20 14:30:53,361 INFO L87 Difference]: Start difference. First operand 192 states and 205 transitions. Second operand 28 states. [2020-07-20 14:30:53,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:53,650 INFO L93 Difference]: Finished difference Result 211 states and 226 transitions. [2020-07-20 14:30:53,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 14:30:53,651 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 229 [2020-07-20 14:30:53,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:53,653 INFO L225 Difference]: With dead ends: 211 [2020-07-20 14:30:53,653 INFO L226 Difference]: Without dead ends: 209 [2020-07-20 14:30:53,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 387 SyntacticMatches, 44 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=333, Invalid=479, Unknown=0, NotChecked=0, Total=812 [2020-07-20 14:30:53,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-20 14:30:53,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 204. [2020-07-20 14:30:53,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-20 14:30:53,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 218 transitions. [2020-07-20 14:30:53,664 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 218 transitions. Word has length 229 [2020-07-20 14:30:53,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:53,665 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 218 transitions. [2020-07-20 14:30:53,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 14:30:53,665 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 218 transitions. [2020-07-20 14:30:53,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2020-07-20 14:30:53,666 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:53,667 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 23, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:53,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:53,880 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:53,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:53,880 INFO L82 PathProgramCache]: Analyzing trace with hash -777665740, now seen corresponding path program 33 times [2020-07-20 14:30:53,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:53,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [39856295] [2020-07-20 14:30:53,881 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 14:30:53,973 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:53,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:53,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 579 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-20 14:30:53,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:55,153 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1188 proven. 506 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2020-07-20 14:30:55,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:56,542 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1102 proven. 506 refuted. 0 times theorem prover too weak. 1014 trivial. 0 not checked. [2020-07-20 14:30:56,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [39856295] [2020-07-20 14:30:56,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:56,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48] total 71 [2020-07-20 14:30:56,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927839107] [2020-07-20 14:30:56,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-20 14:30:56,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:56,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-20 14:30:56,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2020-07-20 14:30:56,545 INFO L87 Difference]: Start difference. First operand 204 states and 218 transitions. Second operand 71 states. [2020-07-20 14:30:58,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:58,186 INFO L93 Difference]: Finished difference Result 403 states and 486 transitions. [2020-07-20 14:30:58,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 14:30:58,186 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 245 [2020-07-20 14:30:58,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:58,188 INFO L225 Difference]: With dead ends: 403 [2020-07-20 14:30:58,188 INFO L226 Difference]: Without dead ends: 298 [2020-07-20 14:30:58,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 397 SyntacticMatches, 23 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2255 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2301, Invalid=6441, Unknown=0, NotChecked=0, Total=8742 [2020-07-20 14:30:58,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2020-07-20 14:30:58,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 206. [2020-07-20 14:30:58,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-20 14:30:58,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 220 transitions. [2020-07-20 14:30:58,201 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 220 transitions. Word has length 245 [2020-07-20 14:30:58,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:58,201 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 220 transitions. [2020-07-20 14:30:58,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-20 14:30:58,202 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 220 transitions. [2020-07-20 14:30:58,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2020-07-20 14:30:58,203 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:58,203 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:58,416 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:58,417 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:58,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:58,418 INFO L82 PathProgramCache]: Analyzing trace with hash 1435577433, now seen corresponding path program 34 times [2020-07-20 14:30:58,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:58,418 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [356215120] [2020-07-20 14:30:58,418 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 14:30:58,527 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:58,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:58,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 587 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-20 14:30:58,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:59,806 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 14:30:59,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:01,322 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 14:31:01,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [356215120] [2020-07-20 14:31:01,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:01,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 74 [2020-07-20 14:31:01,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257867242] [2020-07-20 14:31:01,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-07-20 14:31:01,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:01,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-07-20 14:31:01,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2020-07-20 14:31:01,325 INFO L87 Difference]: Start difference. First operand 206 states and 220 transitions. Second operand 74 states. [2020-07-20 14:31:03,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:03,183 INFO L93 Difference]: Finished difference Result 407 states and 493 transitions. [2020-07-20 14:31:03,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-20 14:31:03,183 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 247 [2020-07-20 14:31:03,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:03,184 INFO L225 Difference]: With dead ends: 407 [2020-07-20 14:31:03,184 INFO L226 Difference]: Without dead ends: 304 [2020-07-20 14:31:03,186 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 397 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2461 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2497, Invalid=7009, Unknown=0, NotChecked=0, Total=9506 [2020-07-20 14:31:03,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-07-20 14:31:03,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 208. [2020-07-20 14:31:03,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-20 14:31:03,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 222 transitions. [2020-07-20 14:31:03,197 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 222 transitions. Word has length 247 [2020-07-20 14:31:03,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:03,198 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 222 transitions. [2020-07-20 14:31:03,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-07-20 14:31:03,198 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 222 transitions. [2020-07-20 14:31:03,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-20 14:31:03,199 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:03,200 INFO L422 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:03,412 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:03,413 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:03,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:03,414 INFO L82 PathProgramCache]: Analyzing trace with hash -1941512130, now seen corresponding path program 35 times [2020-07-20 14:31:03,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:03,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [842649386] [2020-07-20 14:31:03,414 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 14:31:03,524 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:03,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:03,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 14:31:03,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:03,945 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:31:04,013 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 14:31:04,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:04,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:31:04,895 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 14:31:04,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [842649386] [2020-07-20 14:31:04,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:04,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-07-20 14:31:04,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359766772] [2020-07-20 14:31:04,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 14:31:04,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:04,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 14:31:04,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=488, Unknown=0, NotChecked=0, Total=870 [2020-07-20 14:31:04,897 INFO L87 Difference]: Start difference. First operand 208 states and 222 transitions. Second operand 30 states. [2020-07-20 14:31:05,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:05,229 INFO L93 Difference]: Finished difference Result 227 states and 243 transitions. [2020-07-20 14:31:05,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 14:31:05,230 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 249 [2020-07-20 14:31:05,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:05,232 INFO L225 Difference]: With dead ends: 227 [2020-07-20 14:31:05,232 INFO L226 Difference]: Without dead ends: 225 [2020-07-20 14:31:05,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 421 SyntacticMatches, 48 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=386, Invalid=544, Unknown=0, NotChecked=0, Total=930 [2020-07-20 14:31:05,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-20 14:31:05,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 220. [2020-07-20 14:31:05,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2020-07-20 14:31:05,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 235 transitions. [2020-07-20 14:31:05,243 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 235 transitions. Word has length 249 [2020-07-20 14:31:05,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:05,243 INFO L479 AbstractCegarLoop]: Abstraction has 220 states and 235 transitions. [2020-07-20 14:31:05,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 14:31:05,243 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 235 transitions. [2020-07-20 14:31:05,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2020-07-20 14:31:05,245 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:05,245 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 25, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:05,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:05,460 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:05,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:05,461 INFO L82 PathProgramCache]: Analyzing trace with hash -712391136, now seen corresponding path program 36 times [2020-07-20 14:31:05,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:05,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162637172] [2020-07-20 14:31:05,462 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 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 14:31:05,569 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:31:05,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:05,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 52 conjunts are in the unsatisfiable core [2020-07-20 14:31:05,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:06,980 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1392 proven. 600 refuted. 0 times theorem prover too weak. 1108 trivial. 0 not checked. [2020-07-20 14:31:06,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:08,631 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1298 proven. 600 refuted. 0 times theorem prover too weak. 1202 trivial. 0 not checked. [2020-07-20 14:31:08,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162637172] [2020-07-20 14:31:08,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:08,632 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52] total 77 [2020-07-20 14:31:08,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468561700] [2020-07-20 14:31:08,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-20 14:31:08,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:08,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-20 14:31:08,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2020-07-20 14:31:08,633 INFO L87 Difference]: Start difference. First operand 220 states and 235 transitions. Second operand 77 states. [2020-07-20 14:31:10,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:10,594 INFO L93 Difference]: Finished difference Result 435 states and 525 transitions. [2020-07-20 14:31:10,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-20 14:31:10,594 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 265 [2020-07-20 14:31:10,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:10,595 INFO L225 Difference]: With dead ends: 435 [2020-07-20 14:31:10,596 INFO L226 Difference]: Without dead ends: 322 [2020-07-20 14:31:10,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 429 SyntacticMatches, 25 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2676 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2701, Invalid=7601, Unknown=0, NotChecked=0, Total=10302 [2020-07-20 14:31:10,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-20 14:31:10,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 222. [2020-07-20 14:31:10,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-20 14:31:10,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 237 transitions. [2020-07-20 14:31:10,608 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 237 transitions. Word has length 265 [2020-07-20 14:31:10,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:10,608 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 237 transitions. [2020-07-20 14:31:10,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-20 14:31:10,608 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 237 transitions. [2020-07-20 14:31:10,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2020-07-20 14:31:10,610 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:10,610 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:10,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:10,824 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:10,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:10,825 INFO L82 PathProgramCache]: Analyzing trace with hash -993908027, now seen corresponding path program 37 times [2020-07-20 14:31:10,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:10,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [101109242] [2020-07-20 14:31:10,825 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 14:31:10,928 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:31:10,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:10,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 635 conjuncts, 54 conjunts are in the unsatisfiable core [2020-07-20 14:31:10,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:12,469 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 14:31:12,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:14,264 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 14:31:14,264 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [101109242] [2020-07-20 14:31:14,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:14,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54] total 80 [2020-07-20 14:31:14,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577027545] [2020-07-20 14:31:14,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2020-07-20 14:31:14,265 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:14,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2020-07-20 14:31:14,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2020-07-20 14:31:14,266 INFO L87 Difference]: Start difference. First operand 222 states and 237 transitions. Second operand 80 states. [2020-07-20 14:31:16,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:16,368 INFO L93 Difference]: Finished difference Result 439 states and 532 transitions. [2020-07-20 14:31:16,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-20 14:31:16,368 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 267 [2020-07-20 14:31:16,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:16,370 INFO L225 Difference]: With dead ends: 439 [2020-07-20 14:31:16,370 INFO L226 Difference]: Without dead ends: 328 [2020-07-20 14:31:16,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 429 SyntacticMatches, 26 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2900 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2913, Invalid=8217, Unknown=0, NotChecked=0, Total=11130 [2020-07-20 14:31:16,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2020-07-20 14:31:16,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 224. [2020-07-20 14:31:16,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-20 14:31:16,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 239 transitions. [2020-07-20 14:31:16,384 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 239 transitions. Word has length 267 [2020-07-20 14:31:16,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:16,384 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 239 transitions. [2020-07-20 14:31:16,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 80 states. [2020-07-20 14:31:16,384 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 239 transitions. [2020-07-20 14:31:16,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-07-20 14:31:16,386 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:16,386 INFO L422 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:16,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:16,600 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:16,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:16,601 INFO L82 PathProgramCache]: Analyzing trace with hash -948700630, now seen corresponding path program 38 times [2020-07-20 14:31:16,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:16,601 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1537303487] [2020-07-20 14:31:16,601 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 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:16,717 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:16,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:16,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-20 14:31:16,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:17,248 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:31:17,327 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 14:31:17,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:17,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:31:18,354 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 14:31:18,355 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1537303487] [2020-07-20 14:31:18,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:18,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-07-20 14:31:18,355 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378565832] [2020-07-20 14:31:18,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-20 14:31:18,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:18,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-20 14:31:18,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=553, Unknown=0, NotChecked=0, Total=992 [2020-07-20 14:31:18,357 INFO L87 Difference]: Start difference. First operand 224 states and 239 transitions. Second operand 32 states. [2020-07-20 14:31:18,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:18,732 INFO L93 Difference]: Finished difference Result 243 states and 260 transitions. [2020-07-20 14:31:18,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-20 14:31:18,734 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 269 [2020-07-20 14:31:18,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:18,736 INFO L225 Difference]: With dead ends: 243 [2020-07-20 14:31:18,736 INFO L226 Difference]: Without dead ends: 241 [2020-07-20 14:31:18,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 455 SyntacticMatches, 52 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=443, Invalid=613, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 14:31:18,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-07-20 14:31:18,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 236. [2020-07-20 14:31:18,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-20 14:31:18,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 252 transitions. [2020-07-20 14:31:18,748 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 252 transitions. Word has length 269 [2020-07-20 14:31:18,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:18,750 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 252 transitions. [2020-07-20 14:31:18,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-20 14:31:18,750 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 252 transitions. [2020-07-20 14:31:18,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2020-07-20 14:31:18,752 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:18,753 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:18,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:18,966 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:18,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:18,966 INFO L82 PathProgramCache]: Analyzing trace with hash 167610380, now seen corresponding path program 39 times [2020-07-20 14:31:18,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:18,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307533984] [2020-07-20 14:31:18,966 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 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:19,074 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:31:19,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:19,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 675 conjuncts, 56 conjunts are in the unsatisfiable core [2020-07-20 14:31:19,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:20,826 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1612 proven. 702 refuted. 0 times theorem prover too weak. 1304 trivial. 0 not checked. [2020-07-20 14:31:20,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:22,828 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1510 proven. 702 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2020-07-20 14:31:22,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307533984] [2020-07-20 14:31:22,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:22,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56] total 83 [2020-07-20 14:31:22,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343337494] [2020-07-20 14:31:22,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-20 14:31:22,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:22,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-20 14:31:22,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=5212, Unknown=0, NotChecked=0, Total=6806 [2020-07-20 14:31:22,831 INFO L87 Difference]: Start difference. First operand 236 states and 252 transitions. Second operand 83 states. [2020-07-20 14:31:25,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:25,087 INFO L93 Difference]: Finished difference Result 467 states and 564 transitions. [2020-07-20 14:31:25,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-20 14:31:25,088 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 285 [2020-07-20 14:31:25,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:25,090 INFO L225 Difference]: With dead ends: 467 [2020-07-20 14:31:25,090 INFO L226 Difference]: Without dead ends: 346 [2020-07-20 14:31:25,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 596 GetRequests, 461 SyntacticMatches, 27 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3133 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=3133, Invalid=8857, Unknown=0, NotChecked=0, Total=11990 [2020-07-20 14:31:25,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2020-07-20 14:31:25,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 238. [2020-07-20 14:31:25,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-20 14:31:25,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 254 transitions. [2020-07-20 14:31:25,104 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 254 transitions. Word has length 285 [2020-07-20 14:31:25,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:25,104 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 254 transitions. [2020-07-20 14:31:25,104 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-20 14:31:25,104 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 254 transitions. [2020-07-20 14:31:25,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-20 14:31:25,106 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:25,106 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:25,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:25,323 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:25,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:25,323 INFO L82 PathProgramCache]: Analyzing trace with hash 196225073, now seen corresponding path program 40 times [2020-07-20 14:31:25,323 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:25,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1485044359] [2020-07-20 14:31:25,324 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 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:25,437 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:31:25,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:25,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 682 conjuncts, 58 conjunts are in the unsatisfiable core [2020-07-20 14:31:25,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:27,246 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 14:31:27,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:29,389 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 14:31:29,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1485044359] [2020-07-20 14:31:29,389 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:29,390 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58] total 86 [2020-07-20 14:31:29,390 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454869130] [2020-07-20 14:31:29,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-07-20 14:31:29,391 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:29,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-07-20 14:31:29,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2020-07-20 14:31:29,392 INFO L87 Difference]: Start difference. First operand 238 states and 254 transitions. Second operand 86 states. [2020-07-20 14:31:31,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:31,822 INFO L93 Difference]: Finished difference Result 471 states and 571 transitions. [2020-07-20 14:31:31,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-20 14:31:31,822 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 287 [2020-07-20 14:31:31,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:31,824 INFO L225 Difference]: With dead ends: 471 [2020-07-20 14:31:31,824 INFO L226 Difference]: Without dead ends: 352 [2020-07-20 14:31:31,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 461 SyntacticMatches, 28 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3375 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=3361, Invalid=9521, Unknown=0, NotChecked=0, Total=12882 [2020-07-20 14:31:31,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2020-07-20 14:31:31,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 240. [2020-07-20 14:31:31,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-20 14:31:31,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 256 transitions. [2020-07-20 14:31:31,839 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 256 transitions. Word has length 287 [2020-07-20 14:31:31,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:31,839 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 256 transitions. [2020-07-20 14:31:31,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-07-20 14:31:31,839 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 256 transitions. [2020-07-20 14:31:31,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-07-20 14:31:31,841 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:31,842 INFO L422 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:32,057 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:32,058 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:32,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:32,059 INFO L82 PathProgramCache]: Analyzing trace with hash 1925141270, now seen corresponding path program 41 times [2020-07-20 14:31:32,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:32,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1429433268] [2020-07-20 14:31:32,060 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 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:32,184 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:32,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:32,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 782 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-20 14:31:32,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:32,791 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:31:32,880 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 14:31:32,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:32,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:31:34,216 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 14:31:34,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1429433268] [2020-07-20 14:31:34,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:34,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2020-07-20 14:31:34,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705907376] [2020-07-20 14:31:34,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-20 14:31:34,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:34,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-20 14:31:34,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=622, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 14:31:34,222 INFO L87 Difference]: Start difference. First operand 240 states and 256 transitions. Second operand 34 states. [2020-07-20 14:31:34,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:34,690 INFO L93 Difference]: Finished difference Result 259 states and 277 transitions. [2020-07-20 14:31:34,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 14:31:34,691 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 289 [2020-07-20 14:31:34,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:34,693 INFO L225 Difference]: With dead ends: 259 [2020-07-20 14:31:34,693 INFO L226 Difference]: Without dead ends: 257 [2020-07-20 14:31:34,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 489 SyntacticMatches, 56 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=504, Invalid=686, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 14:31:34,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-20 14:31:34,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 252. [2020-07-20 14:31:34,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 252 states. [2020-07-20 14:31:34,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 269 transitions. [2020-07-20 14:31:34,709 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 269 transitions. Word has length 289 [2020-07-20 14:31:34,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:34,709 INFO L479 AbstractCegarLoop]: Abstraction has 252 states and 269 transitions. [2020-07-20 14:31:34,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-20 14:31:34,710 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 269 transitions. [2020-07-20 14:31:34,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-20 14:31:34,711 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:34,712 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 29, 29, 29, 29, 29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:34,926 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:34,926 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:34,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:34,927 INFO L82 PathProgramCache]: Analyzing trace with hash -2144237320, now seen corresponding path program 42 times [2020-07-20 14:31:34,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:34,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517220718] [2020-07-20 14:31:34,927 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 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:35,046 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:31:35,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:35,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 723 conjuncts, 60 conjunts are in the unsatisfiable core [2020-07-20 14:31:35,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:37,110 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1848 proven. 812 refuted. 0 times theorem prover too weak. 1516 trivial. 0 not checked. [2020-07-20 14:31:37,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:39,438 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1738 proven. 812 refuted. 0 times theorem prover too weak. 1626 trivial. 0 not checked. [2020-07-20 14:31:39,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517220718] [2020-07-20 14:31:39,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:39,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60] total 89 [2020-07-20 14:31:39,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244998806] [2020-07-20 14:31:39,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-20 14:31:39,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:39,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-20 14:31:39,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2020-07-20 14:31:39,440 INFO L87 Difference]: Start difference. First operand 252 states and 269 transitions. Second operand 89 states. [2020-07-20 14:31:42,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:42,170 INFO L93 Difference]: Finished difference Result 499 states and 603 transitions. [2020-07-20 14:31:42,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-07-20 14:31:42,170 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 305 [2020-07-20 14:31:42,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:42,173 INFO L225 Difference]: With dead ends: 499 [2020-07-20 14:31:42,173 INFO L226 Difference]: Without dead ends: 370 [2020-07-20 14:31:42,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 493 SyntacticMatches, 29 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3626 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=3597, Invalid=10209, Unknown=0, NotChecked=0, Total=13806 [2020-07-20 14:31:42,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-07-20 14:31:42,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 254. [2020-07-20 14:31:42,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-20 14:31:42,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 271 transitions. [2020-07-20 14:31:42,188 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 271 transitions. Word has length 305 [2020-07-20 14:31:42,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:42,188 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 271 transitions. [2020-07-20 14:31:42,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-20 14:31:42,189 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 271 transitions. [2020-07-20 14:31:42,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2020-07-20 14:31:42,191 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:42,191 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:42,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:42,407 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:42,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:42,408 INFO L82 PathProgramCache]: Analyzing trace with hash 191997085, now seen corresponding path program 43 times [2020-07-20 14:31:42,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:42,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2032311689] [2020-07-20 14:31:42,408 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 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:42,529 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:31:42,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:42,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 730 conjuncts, 62 conjunts are in the unsatisfiable core [2020-07-20 14:31:42,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:44,658 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 14:31:44,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:47,196 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 14:31:47,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2032311689] [2020-07-20 14:31:47,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:47,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62] total 92 [2020-07-20 14:31:47,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632501145] [2020-07-20 14:31:47,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2020-07-20 14:31:47,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:47,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2020-07-20 14:31:47,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2020-07-20 14:31:47,198 INFO L87 Difference]: Start difference. First operand 254 states and 271 transitions. Second operand 92 states. [2020-07-20 14:31:50,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:50,014 INFO L93 Difference]: Finished difference Result 503 states and 610 transitions. [2020-07-20 14:31:50,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-07-20 14:31:50,014 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 307 [2020-07-20 14:31:50,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:50,016 INFO L225 Difference]: With dead ends: 503 [2020-07-20 14:31:50,017 INFO L226 Difference]: Without dead ends: 376 [2020-07-20 14:31:50,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 493 SyntacticMatches, 30 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3886 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=3841, Invalid=10921, Unknown=0, NotChecked=0, Total=14762 [2020-07-20 14:31:50,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-07-20 14:31:50,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 256. [2020-07-20 14:31:50,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-20 14:31:50,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 273 transitions. [2020-07-20 14:31:50,034 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 273 transitions. Word has length 307 [2020-07-20 14:31:50,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:50,034 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 273 transitions. [2020-07-20 14:31:50,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 92 states. [2020-07-20 14:31:50,034 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 273 transitions. [2020-07-20 14:31:50,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-20 14:31:50,036 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:50,037 INFO L422 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:50,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:50,251 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:50,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:50,251 INFO L82 PathProgramCache]: Analyzing trace with hash -954635518, now seen corresponding path program 44 times [2020-07-20 14:31:50,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:50,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [726077250] [2020-07-20 14:31:50,252 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 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:50,380 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:50,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:50,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-20 14:31:50,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:51,081 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:31:51,202 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 14:31:51,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:51,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:31:52,657 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 14:31:52,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [726077250] [2020-07-20 14:31:52,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:52,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2020-07-20 14:31:52,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190801000] [2020-07-20 14:31:52,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 14:31:52,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:52,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 14:31:52,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=695, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 14:31:52,659 INFO L87 Difference]: Start difference. First operand 256 states and 273 transitions. Second operand 36 states. [2020-07-20 14:31:53,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:53,152 INFO L93 Difference]: Finished difference Result 275 states and 294 transitions. [2020-07-20 14:31:53,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 14:31:53,153 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 309 [2020-07-20 14:31:53,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:53,156 INFO L225 Difference]: With dead ends: 275 [2020-07-20 14:31:53,156 INFO L226 Difference]: Without dead ends: 273 [2020-07-20 14:31:53,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 523 SyntacticMatches, 60 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1109 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=569, Invalid=763, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 14:31:53,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2020-07-20 14:31:53,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 268. [2020-07-20 14:31:53,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-20 14:31:53,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 286 transitions. [2020-07-20 14:31:53,170 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 286 transitions. Word has length 309 [2020-07-20 14:31:53,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:53,171 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 286 transitions. [2020-07-20 14:31:53,171 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 14:31:53,171 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 286 transitions. [2020-07-20 14:31:53,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2020-07-20 14:31:53,173 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:53,173 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:53,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:53,389 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:53,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:53,389 INFO L82 PathProgramCache]: Analyzing trace with hash -2146023196, now seen corresponding path program 45 times [2020-07-20 14:31:53,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:53,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [681861021] [2020-07-20 14:31:53,389 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 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:53,513 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:31:53,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:53,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 770 conjuncts, 64 conjunts are in the unsatisfiable core [2020-07-20 14:31:53,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:55,845 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 2100 proven. 930 refuted. 0 times theorem prover too weak. 1744 trivial. 0 not checked. [2020-07-20 14:31:55,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:58,616 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 1982 proven. 930 refuted. 0 times theorem prover too weak. 1862 trivial. 0 not checked. [2020-07-20 14:31:58,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [681861021] [2020-07-20 14:31:58,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:58,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64] total 95 [2020-07-20 14:31:58,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898286923] [2020-07-20 14:31:58,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-20 14:31:58,618 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:58,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-20 14:31:58,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2020-07-20 14:31:58,619 INFO L87 Difference]: Start difference. First operand 268 states and 286 transitions. Second operand 95 states. [2020-07-20 14:32:02,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:02,884 INFO L93 Difference]: Finished difference Result 531 states and 642 transitions. [2020-07-20 14:32:02,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-20 14:32:02,885 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 325 [2020-07-20 14:32:02,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:02,888 INFO L225 Difference]: With dead ends: 531 [2020-07-20 14:32:02,889 INFO L226 Difference]: Without dead ends: 394 [2020-07-20 14:32:02,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 525 SyntacticMatches, 31 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4155 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=4093, Invalid=11657, Unknown=0, NotChecked=0, Total=15750 [2020-07-20 14:32:02,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2020-07-20 14:32:02,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 270. [2020-07-20 14:32:02,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-20 14:32:02,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 288 transitions. [2020-07-20 14:32:02,919 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 288 transitions. Word has length 325 [2020-07-20 14:32:02,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:02,919 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 288 transitions. [2020-07-20 14:32:02,919 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-20 14:32:02,920 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 288 transitions. [2020-07-20 14:32:02,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-20 14:32:02,924 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:02,924 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:32:03,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:03,134 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:03,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:03,135 INFO L82 PathProgramCache]: Analyzing trace with hash 735125513, now seen corresponding path program 46 times [2020-07-20 14:32:03,135 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:03,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189552508] [2020-07-20 14:32:03,135 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 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:03,337 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:32:03,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:03,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 778 conjuncts, 66 conjunts are in the unsatisfiable core [2020-07-20 14:32:03,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:06,582 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 14:32:06,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:09,584 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 14:32:09,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1189552508] [2020-07-20 14:32:09,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:32:09,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66] total 98 [2020-07-20 14:32:09,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119651207] [2020-07-20 14:32:09,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-20 14:32:09,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:09,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-20 14:32:09,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2209, Invalid=7297, Unknown=0, NotChecked=0, Total=9506 [2020-07-20 14:32:09,587 INFO L87 Difference]: Start difference. First operand 270 states and 288 transitions. Second operand 98 states. [2020-07-20 14:32:12,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:12,823 INFO L93 Difference]: Finished difference Result 535 states and 649 transitions. [2020-07-20 14:32:12,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-20 14:32:12,824 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 327 [2020-07-20 14:32:12,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:12,825 INFO L225 Difference]: With dead ends: 535 [2020-07-20 14:32:12,825 INFO L226 Difference]: Without dead ends: 400 [2020-07-20 14:32:12,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 525 SyntacticMatches, 32 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4433 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=4353, Invalid=12417, Unknown=0, NotChecked=0, Total=16770 [2020-07-20 14:32:12,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2020-07-20 14:32:12,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 272. [2020-07-20 14:32:12,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2020-07-20 14:32:12,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 290 transitions. [2020-07-20 14:32:12,841 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 290 transitions. Word has length 327 [2020-07-20 14:32:12,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:12,841 INFO L479 AbstractCegarLoop]: Abstraction has 272 states and 290 transitions. [2020-07-20 14:32:12,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-20 14:32:12,841 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 290 transitions. [2020-07-20 14:32:12,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2020-07-20 14:32:12,843 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:12,843 INFO L422 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:32:13,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:13,045 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:13,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:13,045 INFO L82 PathProgramCache]: Analyzing trace with hash -734871058, now seen corresponding path program 47 times [2020-07-20 14:32:13,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:13,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541332457] [2020-07-20 14:32:13,046 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 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:13,188 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:32:13,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:13,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 890 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 14:32:13,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:14,022 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:32:14,136 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 14:32:14,137 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:14,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:32:15,869 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 14:32:15,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541332457] [2020-07-20 14:32:15,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:32:15,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2020-07-20 14:32:15,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428313939] [2020-07-20 14:32:15,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-20 14:32:15,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:15,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-20 14:32:15,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=634, Invalid=772, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 14:32:15,870 INFO L87 Difference]: Start difference. First operand 272 states and 290 transitions. Second operand 38 states. [2020-07-20 14:32:16,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:16,366 INFO L93 Difference]: Finished difference Result 291 states and 311 transitions. [2020-07-20 14:32:16,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 14:32:16,367 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 329 [2020-07-20 14:32:16,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:16,370 INFO L225 Difference]: With dead ends: 291 [2020-07-20 14:32:16,370 INFO L226 Difference]: Without dead ends: 289 [2020-07-20 14:32:16,370 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 557 SyntacticMatches, 64 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=638, Invalid=844, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 14:32:16,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2020-07-20 14:32:16,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 284. [2020-07-20 14:32:16,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-20 14:32:16,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 303 transitions. [2020-07-20 14:32:16,383 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 303 transitions. Word has length 329 [2020-07-20 14:32:16,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:16,383 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 303 transitions. [2020-07-20 14:32:16,383 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-20 14:32:16,383 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 303 transitions. [2020-07-20 14:32:16,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2020-07-20 14:32:16,386 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:16,386 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 33, 33, 33, 33, 33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:32:16,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:16,600 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:16,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:16,601 INFO L82 PathProgramCache]: Analyzing trace with hash -1470347312, now seen corresponding path program 48 times [2020-07-20 14:32:16,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:16,601 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [113842077] [2020-07-20 14:32:16,602 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 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:16,745 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:32:16,746 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:16,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 818 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-20 14:32:16,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:19,499 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2368 proven. 1056 refuted. 0 times theorem prover too weak. 1988 trivial. 0 not checked. [2020-07-20 14:32:19,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:22,738 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2242 proven. 1056 refuted. 0 times theorem prover too weak. 2114 trivial. 0 not checked. [2020-07-20 14:32:22,739 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [113842077] [2020-07-20 14:32:22,739 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:32:22,739 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68] total 101 [2020-07-20 14:32:22,739 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911921654] [2020-07-20 14:32:22,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-20 14:32:22,740 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:22,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-20 14:32:22,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2020-07-20 14:32:22,741 INFO L87 Difference]: Start difference. First operand 284 states and 303 transitions. Second operand 101 states. [2020-07-20 14:32:26,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:26,790 INFO L93 Difference]: Finished difference Result 563 states and 681 transitions. [2020-07-20 14:32:26,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2020-07-20 14:32:26,790 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 345 [2020-07-20 14:32:26,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:26,793 INFO L225 Difference]: With dead ends: 563 [2020-07-20 14:32:26,793 INFO L226 Difference]: Without dead ends: 418 [2020-07-20 14:32:26,795 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 557 SyntacticMatches, 33 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4720 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=4621, Invalid=13201, Unknown=0, NotChecked=0, Total=17822 [2020-07-20 14:32:26,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2020-07-20 14:32:26,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 286. [2020-07-20 14:32:26,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2020-07-20 14:32:26,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 305 transitions. [2020-07-20 14:32:26,808 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 305 transitions. Word has length 345 [2020-07-20 14:32:26,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:26,808 INFO L479 AbstractCegarLoop]: Abstraction has 286 states and 305 transitions. [2020-07-20 14:32:26,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-20 14:32:26,809 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 305 transitions. [2020-07-20 14:32:26,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-07-20 14:32:26,811 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:26,811 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:32:27,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:27,021 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:27,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:27,022 INFO L82 PathProgramCache]: Analyzing trace with hash 2069961333, now seen corresponding path program 49 times [2020-07-20 14:32:27,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:27,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1868756488] [2020-07-20 14:32:27,023 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 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:27,156 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:32:27,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:27,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 70 conjunts are in the unsatisfiable core [2020-07-20 14:32:27,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:30,136 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 14:32:30,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:33,681 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 14:32:33,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1868756488] [2020-07-20 14:32:33,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:32:33,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70] total 104 [2020-07-20 14:32:33,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145016404] [2020-07-20 14:32:33,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2020-07-20 14:32:33,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:33,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2020-07-20 14:32:33,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=8229, Unknown=0, NotChecked=0, Total=10712 [2020-07-20 14:32:33,685 INFO L87 Difference]: Start difference. First operand 286 states and 305 transitions. Second operand 104 states. [2020-07-20 14:32:37,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:37,662 INFO L93 Difference]: Finished difference Result 567 states and 688 transitions. [2020-07-20 14:32:37,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-20 14:32:37,662 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 347 [2020-07-20 14:32:37,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:37,664 INFO L225 Difference]: With dead ends: 567 [2020-07-20 14:32:37,664 INFO L226 Difference]: Without dead ends: 424 [2020-07-20 14:32:37,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 727 GetRequests, 557 SyntacticMatches, 34 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5016 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=4897, Invalid=14009, Unknown=0, NotChecked=0, Total=18906 [2020-07-20 14:32:37,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2020-07-20 14:32:37,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 288. [2020-07-20 14:32:37,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-20 14:32:37,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 307 transitions. [2020-07-20 14:32:37,681 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 307 transitions. Word has length 347 [2020-07-20 14:32:37,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:37,681 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 307 transitions. [2020-07-20 14:32:37,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 104 states. [2020-07-20 14:32:37,681 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 307 transitions. [2020-07-20 14:32:37,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2020-07-20 14:32:37,684 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:37,684 INFO L422 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:32:37,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:37,899 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:37,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:37,899 INFO L82 PathProgramCache]: Analyzing trace with hash -1602496550, now seen corresponding path program 50 times [2020-07-20 14:32:37,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:37,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [294602267] [2020-07-20 14:32:37,900 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 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:38,050 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:32:38,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:38,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 944 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-20 14:32:38,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:39,043 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:32:39,166 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 14:32:39,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:39,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:32:41,241 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 14:32:41,242 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [294602267] [2020-07-20 14:32:41,242 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:32:41,242 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2020-07-20 14:32:41,242 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793302163] [2020-07-20 14:32:41,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-20 14:32:41,243 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:41,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-20 14:32:41,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=707, Invalid=853, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 14:32:41,243 INFO L87 Difference]: Start difference. First operand 288 states and 307 transitions. Second operand 40 states. [2020-07-20 14:32:41,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:41,839 INFO L93 Difference]: Finished difference Result 307 states and 328 transitions. [2020-07-20 14:32:41,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 14:32:41,840 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 349 [2020-07-20 14:32:41,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:41,842 INFO L225 Difference]: With dead ends: 307 [2020-07-20 14:32:41,843 INFO L226 Difference]: Without dead ends: 305 [2020-07-20 14:32:41,843 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 591 SyntacticMatches, 68 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1393 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=711, Invalid=929, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 14:32:41,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-20 14:32:41,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 300. [2020-07-20 14:32:41,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-20 14:32:41,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 320 transitions. [2020-07-20 14:32:41,854 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 320 transitions. Word has length 349 [2020-07-20 14:32:41,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:41,855 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 320 transitions. [2020-07-20 14:32:41,855 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-20 14:32:41,855 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 320 transitions. [2020-07-20 14:32:41,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2020-07-20 14:32:41,857 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:41,858 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:32:42,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:42,071 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:42,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:42,071 INFO L82 PathProgramCache]: Analyzing trace with hash 242484668, now seen corresponding path program 51 times [2020-07-20 14:32:42,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:42,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [312736283] [2020-07-20 14:32:42,072 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 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:42,233 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:32:42,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:42,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 866 conjuncts, 72 conjunts are in the unsatisfiable core [2020-07-20 14:32:42,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:45,528 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2652 proven. 1190 refuted. 0 times theorem prover too weak. 2248 trivial. 0 not checked. [2020-07-20 14:32:45,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:49,422 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2518 proven. 1190 refuted. 0 times theorem prover too weak. 2382 trivial. 0 not checked. [2020-07-20 14:32:49,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [312736283] [2020-07-20 14:32:49,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:32:49,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72] total 107 [2020-07-20 14:32:49,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576969161] [2020-07-20 14:32:49,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2020-07-20 14:32:49,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:49,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2020-07-20 14:32:49,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2020-07-20 14:32:49,425 INFO L87 Difference]: Start difference. First operand 300 states and 320 transitions. Second operand 107 states. [2020-07-20 14:32:53,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:53,933 INFO L93 Difference]: Finished difference Result 595 states and 720 transitions. [2020-07-20 14:32:53,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-20 14:32:53,933 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 365 [2020-07-20 14:32:53,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:53,935 INFO L225 Difference]: With dead ends: 595 [2020-07-20 14:32:53,935 INFO L226 Difference]: Without dead ends: 442 [2020-07-20 14:32:53,937 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 589 SyntacticMatches, 35 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5321 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=5181, Invalid=14841, Unknown=0, NotChecked=0, Total=20022 [2020-07-20 14:32:53,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2020-07-20 14:32:53,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 302. [2020-07-20 14:32:53,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-20 14:32:53,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 322 transitions. [2020-07-20 14:32:53,951 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 322 transitions. Word has length 365 [2020-07-20 14:32:53,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:53,951 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 322 transitions. [2020-07-20 14:32:53,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 107 states. [2020-07-20 14:32:53,951 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 322 transitions. [2020-07-20 14:32:53,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 368 [2020-07-20 14:32:53,953 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:53,953 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:32:54,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:54,154 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:54,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:54,155 INFO L82 PathProgramCache]: Analyzing trace with hash -814607391, now seen corresponding path program 52 times [2020-07-20 14:32:54,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:54,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1403578687] [2020-07-20 14:32:54,155 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 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:54,296 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:32:54,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:54,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 74 conjunts are in the unsatisfiable core [2020-07-20 14:32:54,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:57,841 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 14:32:57,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:02,106 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 14:33:02,106 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1403578687] [2020-07-20 14:33:02,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:33:02,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74] total 110 [2020-07-20 14:33:02,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696501522] [2020-07-20 14:33:02,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2020-07-20 14:33:02,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:02,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2020-07-20 14:33:02,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2773, Invalid=9217, Unknown=0, NotChecked=0, Total=11990 [2020-07-20 14:33:02,109 INFO L87 Difference]: Start difference. First operand 302 states and 322 transitions. Second operand 110 states. [2020-07-20 14:33:07,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:07,372 INFO L93 Difference]: Finished difference Result 599 states and 727 transitions. [2020-07-20 14:33:07,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2020-07-20 14:33:07,372 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 367 [2020-07-20 14:33:07,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:07,374 INFO L225 Difference]: With dead ends: 599 [2020-07-20 14:33:07,374 INFO L226 Difference]: Without dead ends: 448 [2020-07-20 14:33:07,376 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 589 SyntacticMatches, 36 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5635 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=5473, Invalid=15697, Unknown=0, NotChecked=0, Total=21170 [2020-07-20 14:33:07,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2020-07-20 14:33:07,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 304. [2020-07-20 14:33:07,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-20 14:33:07,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 324 transitions. [2020-07-20 14:33:07,393 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 324 transitions. Word has length 367 [2020-07-20 14:33:07,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:07,393 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 324 transitions. [2020-07-20 14:33:07,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 110 states. [2020-07-20 14:33:07,394 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 324 transitions. [2020-07-20 14:33:07,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2020-07-20 14:33:07,396 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:07,397 INFO L422 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:33:07,611 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:07,612 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:07,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:07,613 INFO L82 PathProgramCache]: Analyzing trace with hash 1227173062, now seen corresponding path program 53 times [2020-07-20 14:33:07,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:07,613 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1689870914] [2020-07-20 14:33:07,614 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 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:07,770 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:33:07,771 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:07,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-20 14:33:07,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:08,959 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:33:09,093 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 14:33:09,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:09,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:33:11,576 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 14:33:11,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1689870914] [2020-07-20 14:33:11,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:33:11,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 42 [2020-07-20 14:33:11,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472716869] [2020-07-20 14:33:11,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-20 14:33:11,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:11,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-20 14:33:11,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=784, Invalid=938, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 14:33:11,579 INFO L87 Difference]: Start difference. First operand 304 states and 324 transitions. Second operand 42 states. [2020-07-20 14:33:12,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:12,271 INFO L93 Difference]: Finished difference Result 323 states and 345 transitions. [2020-07-20 14:33:12,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-20 14:33:12,272 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 369 [2020-07-20 14:33:12,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:12,275 INFO L225 Difference]: With dead ends: 323 [2020-07-20 14:33:12,275 INFO L226 Difference]: Without dead ends: 321 [2020-07-20 14:33:12,275 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 738 GetRequests, 625 SyntacticMatches, 72 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1547 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=788, Invalid=1018, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 14:33:12,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-20 14:33:12,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 316. [2020-07-20 14:33:12,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-20 14:33:12,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 337 transitions. [2020-07-20 14:33:12,290 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 337 transitions. Word has length 369 [2020-07-20 14:33:12,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:12,291 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 337 transitions. [2020-07-20 14:33:12,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-20 14:33:12,291 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 337 transitions. [2020-07-20 14:33:12,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2020-07-20 14:33:12,294 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:12,294 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 37, 37, 37, 37, 37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:33:12,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:12,508 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:12,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:12,509 INFO L82 PathProgramCache]: Analyzing trace with hash 1586365096, now seen corresponding path program 54 times [2020-07-20 14:33:12,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:12,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933041501] [2020-07-20 14:33:12,510 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 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:12,680 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:33:12,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:12,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 914 conjuncts, 76 conjunts are in the unsatisfiable core [2020-07-20 14:33:12,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:16,612 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2952 proven. 1332 refuted. 0 times theorem prover too weak. 2524 trivial. 0 not checked. [2020-07-20 14:33:16,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:21,286 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2810 proven. 1332 refuted. 0 times theorem prover too weak. 2666 trivial. 0 not checked. [2020-07-20 14:33:21,286 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933041501] [2020-07-20 14:33:21,286 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:33:21,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76] total 113 [2020-07-20 14:33:21,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465734331] [2020-07-20 14:33:21,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2020-07-20 14:33:21,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:21,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2020-07-20 14:33:21,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2020-07-20 14:33:21,289 INFO L87 Difference]: Start difference. First operand 316 states and 337 transitions. Second operand 113 states. [2020-07-20 14:33:26,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:26,410 INFO L93 Difference]: Finished difference Result 627 states and 759 transitions. [2020-07-20 14:33:26,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-20 14:33:26,410 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 385 [2020-07-20 14:33:26,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:26,412 INFO L225 Difference]: With dead ends: 627 [2020-07-20 14:33:26,413 INFO L226 Difference]: Without dead ends: 466 [2020-07-20 14:33:26,415 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 806 GetRequests, 621 SyntacticMatches, 37 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5958 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=5773, Invalid=16577, Unknown=0, NotChecked=0, Total=22350 [2020-07-20 14:33:26,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2020-07-20 14:33:26,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 318. [2020-07-20 14:33:26,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-07-20 14:33:26,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 339 transitions. [2020-07-20 14:33:26,427 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 339 transitions. Word has length 385 [2020-07-20 14:33:26,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:26,428 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 339 transitions. [2020-07-20 14:33:26,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 113 states. [2020-07-20 14:33:26,428 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 339 transitions. [2020-07-20 14:33:26,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-20 14:33:26,430 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:26,430 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:33:26,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:26,631 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:26,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:26,632 INFO L82 PathProgramCache]: Analyzing trace with hash -468415411, now seen corresponding path program 55 times [2020-07-20 14:33:26,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:26,632 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [515755008] [2020-07-20 14:33:26,632 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 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:26,781 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:33:26,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:26,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 921 conjuncts, 78 conjunts are in the unsatisfiable core [2020-07-20 14:33:26,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:31,032 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 14:33:31,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:36,099 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 14:33:36,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [515755008] [2020-07-20 14:33:36,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:33:36,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78] total 116 [2020-07-20 14:33:36,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991145967] [2020-07-20 14:33:36,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2020-07-20 14:33:36,101 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:36,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2020-07-20 14:33:36,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3079, Invalid=10261, Unknown=0, NotChecked=0, Total=13340 [2020-07-20 14:33:36,102 INFO L87 Difference]: Start difference. First operand 318 states and 339 transitions. Second operand 116 states. [2020-07-20 14:33:41,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:41,677 INFO L93 Difference]: Finished difference Result 631 states and 766 transitions. [2020-07-20 14:33:41,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-07-20 14:33:41,678 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 387 [2020-07-20 14:33:41,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:41,680 INFO L225 Difference]: With dead ends: 631 [2020-07-20 14:33:41,680 INFO L226 Difference]: Without dead ends: 472 [2020-07-20 14:33:41,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 621 SyntacticMatches, 38 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6290 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=6081, Invalid=17481, Unknown=0, NotChecked=0, Total=23562 [2020-07-20 14:33:41,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-20 14:33:41,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 320. [2020-07-20 14:33:41,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 320 states. [2020-07-20 14:33:41,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 341 transitions. [2020-07-20 14:33:41,695 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 341 transitions. Word has length 387 [2020-07-20 14:33:41,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:41,695 INFO L479 AbstractCegarLoop]: Abstraction has 320 states and 341 transitions. [2020-07-20 14:33:41,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 116 states. [2020-07-20 14:33:41,696 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 341 transitions. [2020-07-20 14:33:41,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-07-20 14:33:41,697 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:41,697 INFO L422 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:33:41,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:41,898 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:41,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:41,899 INFO L82 PathProgramCache]: Analyzing trace with hash 572473522, now seen corresponding path program 56 times [2020-07-20 14:33:41,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:41,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598594102] [2020-07-20 14:33:41,900 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 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:42,084 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:33:42,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:42,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-20 14:33:42,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:43,525 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:33:43,677 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 14:33:43,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:43,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:33:46,712 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 14:33:46,712 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598594102] [2020-07-20 14:33:46,713 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:33:46,713 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 44 [2020-07-20 14:33:46,713 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117356557] [2020-07-20 14:33:46,713 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-20 14:33:46,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:46,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-20 14:33:46,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=865, Invalid=1027, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 14:33:46,714 INFO L87 Difference]: Start difference. First operand 320 states and 341 transitions. Second operand 44 states. [2020-07-20 14:33:47,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:47,549 INFO L93 Difference]: Finished difference Result 339 states and 362 transitions. [2020-07-20 14:33:47,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-20 14:33:47,551 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 389 [2020-07-20 14:33:47,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:47,552 INFO L225 Difference]: With dead ends: 339 [2020-07-20 14:33:47,553 INFO L226 Difference]: Without dead ends: 337 [2020-07-20 14:33:47,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 778 GetRequests, 659 SyntacticMatches, 76 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1709 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=869, Invalid=1111, Unknown=0, NotChecked=0, Total=1980 [2020-07-20 14:33:47,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2020-07-20 14:33:47,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 332. [2020-07-20 14:33:47,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-20 14:33:47,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 354 transitions. [2020-07-20 14:33:47,565 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 354 transitions. Word has length 389 [2020-07-20 14:33:47,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:47,566 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 354 transitions. [2020-07-20 14:33:47,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-20 14:33:47,566 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 354 transitions. [2020-07-20 14:33:47,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2020-07-20 14:33:47,568 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:47,568 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 39, 39, 39, 39, 39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:33:47,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:47,769 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:47,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:47,770 INFO L82 PathProgramCache]: Analyzing trace with hash -73744748, now seen corresponding path program 57 times [2020-07-20 14:33:47,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:47,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [483940989] [2020-07-20 14:33:47,770 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 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:47,926 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:33:47,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:47,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 961 conjuncts, 80 conjunts are in the unsatisfiable core [2020-07-20 14:33:47,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:52,640 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3268 proven. 1482 refuted. 0 times theorem prover too weak. 2816 trivial. 0 not checked. [2020-07-20 14:33:52,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:58,164 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3118 proven. 1482 refuted. 0 times theorem prover too weak. 2966 trivial. 0 not checked. [2020-07-20 14:33:58,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [483940989] [2020-07-20 14:33:58,165 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:33:58,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80] total 119 [2020-07-20 14:33:58,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081615925] [2020-07-20 14:33:58,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2020-07-20 14:33:58,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:58,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2020-07-20 14:33:58,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2020-07-20 14:33:58,167 INFO L87 Difference]: Start difference. First operand 332 states and 354 transitions. Second operand 119 states. [2020-07-20 14:34:04,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:34:04,632 INFO L93 Difference]: Finished difference Result 659 states and 798 transitions. [2020-07-20 14:34:04,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-07-20 14:34:04,632 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 405 [2020-07-20 14:34:04,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:34:04,634 INFO L225 Difference]: With dead ends: 659 [2020-07-20 14:34:04,634 INFO L226 Difference]: Without dead ends: 490 [2020-07-20 14:34:04,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 653 SyntacticMatches, 39 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6631 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=6397, Invalid=18409, Unknown=0, NotChecked=0, Total=24806 [2020-07-20 14:34:04,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-20 14:34:04,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 334. [2020-07-20 14:34:04,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2020-07-20 14:34:04,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 356 transitions. [2020-07-20 14:34:04,652 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 356 transitions. Word has length 405 [2020-07-20 14:34:04,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:34:04,652 INFO L479 AbstractCegarLoop]: Abstraction has 334 states and 356 transitions. [2020-07-20 14:34:04,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 119 states. [2020-07-20 14:34:04,652 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 356 transitions. [2020-07-20 14:34:04,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-07-20 14:34:04,655 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:34:04,655 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 39, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:34:04,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:04,858 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:34:04,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:34:04,858 INFO L82 PathProgramCache]: Analyzing trace with hash 2082014137, now seen corresponding path program 58 times [2020-07-20 14:34:04,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:34:04,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1663174186] [2020-07-20 14:34:04,859 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 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:05,030 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:34:05,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:34:05,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 969 conjuncts, 82 conjunts are in the unsatisfiable core [2020-07-20 14:34:05,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:34:10,169 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 14:34:10,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:34:16,502 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 14:34:16,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1663174186] [2020-07-20 14:34:16,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:34:16,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82] total 122 [2020-07-20 14:34:16,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293985302] [2020-07-20 14:34:16,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2020-07-20 14:34:16,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:34:16,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2020-07-20 14:34:16,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3401, Invalid=11361, Unknown=0, NotChecked=0, Total=14762 [2020-07-20 14:34:16,505 INFO L87 Difference]: Start difference. First operand 334 states and 356 transitions. Second operand 122 states. [2020-07-20 14:34:23,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:34:23,434 INFO L93 Difference]: Finished difference Result 663 states and 805 transitions. [2020-07-20 14:34:23,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-20 14:34:23,434 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 407 [2020-07-20 14:34:23,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:34:23,436 INFO L225 Difference]: With dead ends: 663 [2020-07-20 14:34:23,437 INFO L226 Difference]: Without dead ends: 496 [2020-07-20 14:34:23,442 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 653 SyntacticMatches, 40 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6981 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=6721, Invalid=19361, Unknown=0, NotChecked=0, Total=26082 [2020-07-20 14:34:23,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2020-07-20 14:34:23,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 336. [2020-07-20 14:34:23,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 336 states. [2020-07-20 14:34:23,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 358 transitions. [2020-07-20 14:34:23,460 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 358 transitions. Word has length 407 [2020-07-20 14:34:23,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:34:23,461 INFO L479 AbstractCegarLoop]: Abstraction has 336 states and 358 transitions. [2020-07-20 14:34:23,461 INFO L480 AbstractCegarLoop]: Interpolant automaton has 122 states. [2020-07-20 14:34:23,461 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 358 transitions. [2020-07-20 14:34:23,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-20 14:34:23,463 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:34:23,463 INFO L422 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:34:23,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:23,664 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:34:23,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:34:23,665 INFO L82 PathProgramCache]: Analyzing trace with hash -702901346, now seen corresponding path program 59 times [2020-07-20 14:34:23,665 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:34:23,665 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2141795650] [2020-07-20 14:34:23,665 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 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:23,840 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:34:23,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:34:23,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 1106 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-20 14:34:23,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:34:25,617 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:34:25,809 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 14:34:25,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:34:25,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:34:29,454 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 14:34:29,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2141795650] [2020-07-20 14:34:29,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:34:29,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45] total 46 [2020-07-20 14:34:29,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430539550] [2020-07-20 14:34:29,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-20 14:34:29,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:34:29,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-20 14:34:29,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=950, Invalid=1120, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 14:34:29,456 INFO L87 Difference]: Start difference. First operand 336 states and 358 transitions. Second operand 46 states. [2020-07-20 14:34:30,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:34:30,381 INFO L93 Difference]: Finished difference Result 355 states and 379 transitions. [2020-07-20 14:34:30,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-20 14:34:30,382 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 409 [2020-07-20 14:34:30,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:34:30,384 INFO L225 Difference]: With dead ends: 355 [2020-07-20 14:34:30,385 INFO L226 Difference]: Without dead ends: 353 [2020-07-20 14:34:30,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 693 SyntacticMatches, 80 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1879 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=954, Invalid=1208, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 14:34:30,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-20 14:34:30,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 348. [2020-07-20 14:34:30,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-20 14:34:30,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 371 transitions. [2020-07-20 14:34:30,404 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 371 transitions. Word has length 409 [2020-07-20 14:34:30,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:34:30,405 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 371 transitions. [2020-07-20 14:34:30,405 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-20 14:34:30,405 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 371 transitions. [2020-07-20 14:34:30,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2020-07-20 14:34:30,408 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:34:30,408 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:34:30,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:30,626 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:34:30,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:34:30,627 INFO L82 PathProgramCache]: Analyzing trace with hash 524990848, now seen corresponding path program 60 times [2020-07-20 14:34:30,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:34:30,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [194635206] [2020-07-20 14:34:30,628 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 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:30,795 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:34:30,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:34:30,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 1009 conjuncts, 84 conjunts are in the unsatisfiable core [2020-07-20 14:34:30,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:34:36,625 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3600 proven. 1640 refuted. 0 times theorem prover too weak. 3124 trivial. 0 not checked. [2020-07-20 14:34:36,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:34:43,830 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3442 proven. 1640 refuted. 0 times theorem prover too weak. 3282 trivial. 0 not checked. [2020-07-20 14:34:43,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [194635206] [2020-07-20 14:34:43,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:34:43,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84] total 125 [2020-07-20 14:34:43,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93105193] [2020-07-20 14:34:43,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 125 states [2020-07-20 14:34:43,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:34:43,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2020-07-20 14:34:43,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3568, Invalid=11932, Unknown=0, NotChecked=0, Total=15500 [2020-07-20 14:34:43,834 INFO L87 Difference]: Start difference. First operand 348 states and 371 transitions. Second operand 125 states. [2020-07-20 14:34:52,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:34:52,038 INFO L93 Difference]: Finished difference Result 691 states and 837 transitions. [2020-07-20 14:34:52,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-20 14:34:52,038 INFO L78 Accepts]: Start accepts. Automaton has 125 states. Word has length 425 [2020-07-20 14:34:52,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:34:52,040 INFO L225 Difference]: With dead ends: 691 [2020-07-20 14:34:52,040 INFO L226 Difference]: Without dead ends: 514 [2020-07-20 14:34:52,043 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 890 GetRequests, 685 SyntacticMatches, 41 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7340 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=7053, Invalid=20337, Unknown=0, NotChecked=0, Total=27390 [2020-07-20 14:34:52,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-20 14:34:52,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 350. [2020-07-20 14:34:52,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-20 14:34:52,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 373 transitions. [2020-07-20 14:34:52,075 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 373 transitions. Word has length 425 [2020-07-20 14:34:52,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:34:52,076 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 373 transitions. [2020-07-20 14:34:52,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 125 states. [2020-07-20 14:34:52,076 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 373 transitions. [2020-07-20 14:34:52,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 428 [2020-07-20 14:34:52,078 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:34:52,078 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:34:52,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:52,279 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:34:52,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:34:52,280 INFO L82 PathProgramCache]: Analyzing trace with hash -2129659355, now seen corresponding path program 61 times [2020-07-20 14:34:52,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:34:52,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1128884188] [2020-07-20 14:34:52,281 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 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:52,450 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:34:52,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:34:52,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 1017 conjuncts, 86 conjunts are in the unsatisfiable core [2020-07-20 14:34:52,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:34:59,022 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 14:34:59,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:35:07,220 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 14:35:07,221 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1128884188] [2020-07-20 14:35:07,221 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:35:07,221 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86] total 128 [2020-07-20 14:35:07,221 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016771339] [2020-07-20 14:35:07,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2020-07-20 14:35:07,223 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:35:07,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2020-07-20 14:35:07,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3739, Invalid=12517, Unknown=0, NotChecked=0, Total=16256 [2020-07-20 14:35:07,225 INFO L87 Difference]: Start difference. First operand 350 states and 373 transitions. Second operand 128 states. [2020-07-20 14:35:16,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:35:16,186 INFO L93 Difference]: Finished difference Result 695 states and 844 transitions. [2020-07-20 14:35:16,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-20 14:35:16,186 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 427 [2020-07-20 14:35:16,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:35:16,189 INFO L225 Difference]: With dead ends: 695 [2020-07-20 14:35:16,190 INFO L226 Difference]: Without dead ends: 520 [2020-07-20 14:35:16,193 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 895 GetRequests, 685 SyntacticMatches, 42 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7708 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=7393, Invalid=21337, Unknown=0, NotChecked=0, Total=28730 [2020-07-20 14:35:16,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2020-07-20 14:35:16,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 352. [2020-07-20 14:35:16,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-20 14:35:16,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 375 transitions. [2020-07-20 14:35:16,210 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 375 transitions. Word has length 427 [2020-07-20 14:35:16,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:35:16,210 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 375 transitions. [2020-07-20 14:35:16,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 128 states. [2020-07-20 14:35:16,210 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 375 transitions. [2020-07-20 14:35:16,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 430 [2020-07-20 14:35:16,214 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:35:16,214 INFO L422 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:35:16,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:16,429 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:35:16,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:35:16,430 INFO L82 PathProgramCache]: Analyzing trace with hash -2037930614, now seen corresponding path program 62 times [2020-07-20 14:35:16,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:35:16,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2020034046] [2020-07-20 14:35:16,431 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:16,622 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:35:16,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:35:16,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 1160 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-20 14:35:16,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:35:18,956 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:35:19,180 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 14:35:19,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:35:19,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:35:24,029 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 14:35:24,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2020034046] [2020-07-20 14:35:24,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:35:24,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47] total 48 [2020-07-20 14:35:24,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470116489] [2020-07-20 14:35:24,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 14:35:24,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:35:24,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 14:35:24,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1039, Invalid=1217, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 14:35:24,032 INFO L87 Difference]: Start difference. First operand 352 states and 375 transitions. Second operand 48 states. [2020-07-20 14:35:25,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:35:25,174 INFO L93 Difference]: Finished difference Result 371 states and 396 transitions. [2020-07-20 14:35:25,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 14:35:25,177 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 429 [2020-07-20 14:35:25,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:35:25,179 INFO L225 Difference]: With dead ends: 371 [2020-07-20 14:35:25,179 INFO L226 Difference]: Without dead ends: 369 [2020-07-20 14:35:25,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 858 GetRequests, 727 SyntacticMatches, 84 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2057 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=1043, Invalid=1309, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 14:35:25,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-20 14:35:25,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 364. [2020-07-20 14:35:25,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2020-07-20 14:35:25,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 388 transitions. [2020-07-20 14:35:25,194 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 388 transitions. Word has length 429 [2020-07-20 14:35:25,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:35:25,194 INFO L479 AbstractCegarLoop]: Abstraction has 364 states and 388 transitions. [2020-07-20 14:35:25,195 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 14:35:25,195 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 388 transitions. [2020-07-20 14:35:25,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 446 [2020-07-20 14:35:25,197 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:35:25,197 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 43, 43, 43, 43, 43, 43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:35:25,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:25,398 INFO L427 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:35:25,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:35:25,399 INFO L82 PathProgramCache]: Analyzing trace with hash -99716244, now seen corresponding path program 63 times [2020-07-20 14:35:25,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:35:25,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [594426147] [2020-07-20 14:35:25,400 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 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:25,579 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:35:25,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:35:25,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 88 conjunts are in the unsatisfiable core [2020-07-20 14:35:25,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:35:33,188 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3948 proven. 1806 refuted. 0 times theorem prover too weak. 3448 trivial. 0 not checked. [2020-07-20 14:35:33,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:35:42,322 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3782 proven. 1806 refuted. 0 times theorem prover too weak. 3614 trivial. 0 not checked. [2020-07-20 14:35:42,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [594426147] [2020-07-20 14:35:42,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:35:42,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88] total 131 [2020-07-20 14:35:42,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149505802] [2020-07-20 14:35:42,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2020-07-20 14:35:42,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:35:42,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2020-07-20 14:35:42,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3914, Invalid=13116, Unknown=0, NotChecked=0, Total=17030 [2020-07-20 14:35:42,326 INFO L87 Difference]: Start difference. First operand 364 states and 388 transitions. Second operand 131 states. [2020-07-20 14:35:52,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:35:52,071 INFO L93 Difference]: Finished difference Result 723 states and 876 transitions. [2020-07-20 14:35:52,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-20 14:35:52,071 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 445 [2020-07-20 14:35:52,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:35:52,074 INFO L225 Difference]: With dead ends: 723 [2020-07-20 14:35:52,074 INFO L226 Difference]: Without dead ends: 538 [2020-07-20 14:35:52,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 717 SyntacticMatches, 43 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8085 ImplicationChecksByTransitivity, 20.2s TimeCoverageRelationStatistics Valid=7741, Invalid=22361, Unknown=0, NotChecked=0, Total=30102 [2020-07-20 14:35:52,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2020-07-20 14:35:52,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 366. [2020-07-20 14:35:52,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 366 states. [2020-07-20 14:35:52,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 390 transitions. [2020-07-20 14:35:52,099 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 390 transitions. Word has length 445 [2020-07-20 14:35:52,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:35:52,099 INFO L479 AbstractCegarLoop]: Abstraction has 366 states and 390 transitions. [2020-07-20 14:35:52,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 131 states. [2020-07-20 14:35:52,099 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 390 transitions. [2020-07-20 14:35:52,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2020-07-20 14:35:52,101 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:35:52,101 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 43, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:35:52,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:52,303 INFO L427 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:35:52,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:35:52,303 INFO L82 PathProgramCache]: Analyzing trace with hash 592048017, now seen corresponding path program 64 times [2020-07-20 14:35:52,304 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:35:52,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1249551104] [2020-07-20 14:35:52,304 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 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:52,514 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:35:52,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:35:52,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 1064 conjuncts, 90 conjunts are in the unsatisfiable core [2020-07-20 14:35:52,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:36:00,917 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 14:36:00,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:36:11,150 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 14:36:11,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1249551104] [2020-07-20 14:36:11,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:36:11,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90] total 134 [2020-07-20 14:36:11,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983286403] [2020-07-20 14:36:11,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-20 14:36:11,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:36:11,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-20 14:36:11,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2020-07-20 14:36:11,153 INFO L87 Difference]: Start difference. First operand 366 states and 390 transitions. Second operand 134 states. [2020-07-20 14:36:23,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:36:23,038 INFO L93 Difference]: Finished difference Result 727 states and 883 transitions. [2020-07-20 14:36:23,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-07-20 14:36:23,039 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 447 [2020-07-20 14:36:23,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:36:23,041 INFO L225 Difference]: With dead ends: 727 [2020-07-20 14:36:23,041 INFO L226 Difference]: Without dead ends: 544 [2020-07-20 14:36:23,044 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 937 GetRequests, 717 SyntacticMatches, 44 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8471 ImplicationChecksByTransitivity, 22.7s TimeCoverageRelationStatistics Valid=8097, Invalid=23409, Unknown=0, NotChecked=0, Total=31506 [2020-07-20 14:36:23,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2020-07-20 14:36:23,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 368. [2020-07-20 14:36:23,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-20 14:36:23,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 392 transitions. [2020-07-20 14:36:23,059 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 392 transitions. Word has length 447 [2020-07-20 14:36:23,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:36:23,059 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 392 transitions. [2020-07-20 14:36:23,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-20 14:36:23,059 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 392 transitions. [2020-07-20 14:36:23,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-20 14:36:23,061 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:36:23,062 INFO L422 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 44, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:36:23,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:36:23,263 INFO L427 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:36:23,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:36:23,264 INFO L82 PathProgramCache]: Analyzing trace with hash -342428042, now seen corresponding path program 65 times [2020-07-20 14:36:23,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:36:23,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1994806150] [2020-07-20 14:36:23,264 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 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:36:23,450 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:36:23,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:36:23,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 1214 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-20 14:36:23,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:36:26,502 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:36:26,778 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 14:36:26,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:36:26,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:36:33,103 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 14:36:33,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1994806150] [2020-07-20 14:36:33,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:36:33,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 50 [2020-07-20 14:36:33,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218543010] [2020-07-20 14:36:33,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 14:36:33,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:36:33,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 14:36:33,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1132, Invalid=1318, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 14:36:33,106 INFO L87 Difference]: Start difference. First operand 368 states and 392 transitions. Second operand 50 states. [2020-07-20 14:36:34,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:36:34,720 INFO L93 Difference]: Finished difference Result 387 states and 413 transitions. [2020-07-20 14:36:34,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-20 14:36:34,723 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 449 [2020-07-20 14:36:34,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:36:34,726 INFO L225 Difference]: With dead ends: 387 [2020-07-20 14:36:34,726 INFO L226 Difference]: Without dead ends: 385 [2020-07-20 14:36:34,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 898 GetRequests, 761 SyntacticMatches, 88 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2243 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=1136, Invalid=1414, Unknown=0, NotChecked=0, Total=2550 [2020-07-20 14:36:34,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2020-07-20 14:36:34,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 380. [2020-07-20 14:36:34,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 380 states. [2020-07-20 14:36:34,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 405 transitions. [2020-07-20 14:36:34,741 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 405 transitions. Word has length 449 [2020-07-20 14:36:34,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:36:34,742 INFO L479 AbstractCegarLoop]: Abstraction has 380 states and 405 transitions. [2020-07-20 14:36:34,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-20 14:36:34,742 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 405 transitions. [2020-07-20 14:36:34,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-20 14:36:34,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:36:34,744 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 45, 45, 45, 45, 45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:36:34,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:36:34,945 INFO L427 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:36:34,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:36:34,946 INFO L82 PathProgramCache]: Analyzing trace with hash -753505192, now seen corresponding path program 66 times [2020-07-20 14:36:34,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:36:34,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1317654637] [2020-07-20 14:36:34,947 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 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:36:35,126 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:36:35,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:36:35,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 1105 conjuncts, 92 conjunts are in the unsatisfiable core [2020-07-20 14:36:35,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:36:44,432 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4312 proven. 1980 refuted. 0 times theorem prover too weak. 3788 trivial. 0 not checked. [2020-07-20 14:36:44,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:36:55,689 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4138 proven. 1980 refuted. 0 times theorem prover too weak. 3962 trivial. 0 not checked. [2020-07-20 14:36:55,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1317654637] [2020-07-20 14:36:55,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:36:55,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92] total 137 [2020-07-20 14:36:55,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164316468] [2020-07-20 14:36:55,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 137 states [2020-07-20 14:36:55,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:36:55,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2020-07-20 14:36:55,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4276, Invalid=14356, Unknown=0, NotChecked=0, Total=18632 [2020-07-20 14:36:55,693 INFO L87 Difference]: Start difference. First operand 380 states and 405 transitions. Second operand 137 states. [2020-07-20 14:37:07,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:37:07,479 INFO L93 Difference]: Finished difference Result 755 states and 915 transitions. [2020-07-20 14:37:07,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2020-07-20 14:37:07,479 INFO L78 Accepts]: Start accepts. Automaton has 137 states. Word has length 465 [2020-07-20 14:37:07,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:37:07,482 INFO L225 Difference]: With dead ends: 755 [2020-07-20 14:37:07,482 INFO L226 Difference]: Without dead ends: 562 [2020-07-20 14:37:07,484 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 974 GetRequests, 749 SyntacticMatches, 45 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8866 ImplicationChecksByTransitivity, 24.8s TimeCoverageRelationStatistics Valid=8461, Invalid=24481, Unknown=0, NotChecked=0, Total=32942 [2020-07-20 14:37:07,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2020-07-20 14:37:07,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 382. [2020-07-20 14:37:07,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 382 states. [2020-07-20 14:37:07,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 407 transitions. [2020-07-20 14:37:07,503 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 407 transitions. Word has length 465 [2020-07-20 14:37:07,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:37:07,504 INFO L479 AbstractCegarLoop]: Abstraction has 382 states and 407 transitions. [2020-07-20 14:37:07,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 137 states. [2020-07-20 14:37:07,504 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 407 transitions. [2020-07-20 14:37:07,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-20 14:37:07,507 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:37:07,508 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:37:07,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:37:07,723 INFO L427 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:37:07,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:37:07,724 INFO L82 PathProgramCache]: Analyzing trace with hash -103324675, now seen corresponding path program 67 times [2020-07-20 14:37:07,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:37:07,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1418885484] [2020-07-20 14:37:07,725 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:37:07,905 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:37:07,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:37:07,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 1112 conjuncts, 94 conjunts are in the unsatisfiable core [2020-07-20 14:37:07,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:37:18,246 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 14:37:18,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:37:30,285 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 14:37:30,286 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1418885484] [2020-07-20 14:37:30,286 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:37:30,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94] total 140 [2020-07-20 14:37:30,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592981605] [2020-07-20 14:37:30,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2020-07-20 14:37:30,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:37:30,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2020-07-20 14:37:30,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4463, Invalid=14997, Unknown=0, NotChecked=0, Total=19460 [2020-07-20 14:37:30,289 INFO L87 Difference]: Start difference. First operand 382 states and 407 transitions. Second operand 140 states. [2020-07-20 14:37:44,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:37:44,141 INFO L93 Difference]: Finished difference Result 759 states and 922 transitions. [2020-07-20 14:37:44,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-20 14:37:44,142 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 467 [2020-07-20 14:37:44,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:37:44,144 INFO L225 Difference]: With dead ends: 759 [2020-07-20 14:37:44,144 INFO L226 Difference]: Without dead ends: 568 [2020-07-20 14:37:44,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 749 SyntacticMatches, 46 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9270 ImplicationChecksByTransitivity, 27.5s TimeCoverageRelationStatistics Valid=8833, Invalid=25577, Unknown=0, NotChecked=0, Total=34410 [2020-07-20 14:37:44,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2020-07-20 14:37:44,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 384. [2020-07-20 14:37:44,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 384 states. [2020-07-20 14:37:44,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 409 transitions. [2020-07-20 14:37:44,163 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 409 transitions. Word has length 467 [2020-07-20 14:37:44,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:37:44,163 INFO L479 AbstractCegarLoop]: Abstraction has 384 states and 409 transitions. [2020-07-20 14:37:44,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 140 states. [2020-07-20 14:37:44,163 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 409 transitions. [2020-07-20 14:37:44,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-20 14:37:44,165 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:37:44,166 INFO L422 BasicCegarLoop]: trace histogram [47, 46, 46, 46, 46, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:37:44,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:37:44,367 INFO L427 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:37:44,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:37:44,368 INFO L82 PathProgramCache]: Analyzing trace with hash 1949894242, now seen corresponding path program 68 times [2020-07-20 14:37:44,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:37:44,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889892981] [2020-07-20 14:37:44,368 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 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:37:44,574 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:37:44,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:37:44,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 1268 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-20 14:37:44,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:37:48,399 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:37:48,696 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 14:37:48,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:37:48,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:37:56,476 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 14:37:56,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889892981] [2020-07-20 14:37:56,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:37:56,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 52 [2020-07-20 14:37:56,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903694752] [2020-07-20 14:37:56,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-20 14:37:56,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:37:56,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-20 14:37:56,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1229, Invalid=1423, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 14:37:56,479 INFO L87 Difference]: Start difference. First operand 384 states and 409 transitions. Second operand 52 states. [2020-07-20 14:37:58,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:37:58,303 INFO L93 Difference]: Finished difference Result 403 states and 430 transitions. [2020-07-20 14:37:58,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-20 14:37:58,307 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 469 [2020-07-20 14:37:58,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:37:58,310 INFO L225 Difference]: With dead ends: 403 [2020-07-20 14:37:58,310 INFO L226 Difference]: Without dead ends: 401 [2020-07-20 14:37:58,311 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 795 SyntacticMatches, 92 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2437 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=1233, Invalid=1523, Unknown=0, NotChecked=0, Total=2756 [2020-07-20 14:37:58,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2020-07-20 14:37:58,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 396. [2020-07-20 14:37:58,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 396 states. [2020-07-20 14:37:58,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 422 transitions. [2020-07-20 14:37:58,329 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 422 transitions. Word has length 469 [2020-07-20 14:37:58,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:37:58,329 INFO L479 AbstractCegarLoop]: Abstraction has 396 states and 422 transitions. [2020-07-20 14:37:58,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-20 14:37:58,329 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 422 transitions. [2020-07-20 14:37:58,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-20 14:37:58,332 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:37:58,332 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 47, 47, 47, 47, 47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:37:58,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:37:58,533 INFO L427 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:37:58,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:37:58,534 INFO L82 PathProgramCache]: Analyzing trace with hash 676537412, now seen corresponding path program 69 times [2020-07-20 14:37:58,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:37:58,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [359449963] [2020-07-20 14:37:58,535 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 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:37:58,723 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:37:58,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:37:58,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 1152 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-20 14:37:58,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:38:11,412 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4692 proven. 2162 refuted. 0 times theorem prover too weak. 4144 trivial. 0 not checked. [2020-07-20 14:38:11,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:38:26,262 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4510 proven. 2162 refuted. 0 times theorem prover too weak. 4326 trivial. 0 not checked. [2020-07-20 14:38:26,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [359449963] [2020-07-20 14:38:26,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:38:26,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96] total 143 [2020-07-20 14:38:26,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305825662] [2020-07-20 14:38:26,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2020-07-20 14:38:26,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:38:26,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2020-07-20 14:38:26,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4654, Invalid=15652, Unknown=0, NotChecked=0, Total=20306 [2020-07-20 14:38:26,266 INFO L87 Difference]: Start difference. First operand 396 states and 422 transitions. Second operand 143 states. [2020-07-20 14:38:41,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:38:41,977 INFO L93 Difference]: Finished difference Result 787 states and 954 transitions. [2020-07-20 14:38:41,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-20 14:38:41,977 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 485 [2020-07-20 14:38:41,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:38:41,980 INFO L225 Difference]: With dead ends: 787 [2020-07-20 14:38:41,980 INFO L226 Difference]: Without dead ends: 586 [2020-07-20 14:38:41,983 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 781 SyntacticMatches, 47 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9683 ImplicationChecksByTransitivity, 33.2s TimeCoverageRelationStatistics Valid=9213, Invalid=26697, Unknown=0, NotChecked=0, Total=35910 [2020-07-20 14:38:41,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-20 14:38:42,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 398. [2020-07-20 14:38:42,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2020-07-20 14:38:42,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 424 transitions. [2020-07-20 14:38:42,009 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 424 transitions. Word has length 485 [2020-07-20 14:38:42,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:38:42,009 INFO L479 AbstractCegarLoop]: Abstraction has 398 states and 424 transitions. [2020-07-20 14:38:42,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 143 states. [2020-07-20 14:38:42,009 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 424 transitions. [2020-07-20 14:38:42,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 14:38:42,028 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:38:42,028 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 48, 47, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:38:42,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:38:42,230 INFO L427 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:38:42,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:38:42,230 INFO L82 PathProgramCache]: Analyzing trace with hash 579393385, now seen corresponding path program 70 times [2020-07-20 14:38:42,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:38:42,231 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1341717688] [2020-07-20 14:38:42,232 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 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:38:42,511 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:38:42,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:38:42,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 1160 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-20 14:38:42,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:38:56,597 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 14:38:56,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:39:13,919 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 14:39:13,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1341717688] [2020-07-20 14:39:13,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:39:13,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98] total 146 [2020-07-20 14:39:13,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915513590] [2020-07-20 14:39:13,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2020-07-20 14:39:13,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:39:13,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2020-07-20 14:39:13,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4849, Invalid=16321, Unknown=0, NotChecked=0, Total=21170 [2020-07-20 14:39:13,922 INFO L87 Difference]: Start difference. First operand 398 states and 424 transitions. Second operand 146 states. [2020-07-20 14:39:33,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:39:33,561 INFO L93 Difference]: Finished difference Result 791 states and 961 transitions. [2020-07-20 14:39:33,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-20 14:39:33,562 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 487 [2020-07-20 14:39:33,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:39:33,565 INFO L225 Difference]: With dead ends: 791 [2020-07-20 14:39:33,565 INFO L226 Difference]: Without dead ends: 592 [2020-07-20 14:39:33,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 781 SyntacticMatches, 48 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10105 ImplicationChecksByTransitivity, 38.3s TimeCoverageRelationStatistics Valid=9601, Invalid=27841, Unknown=0, NotChecked=0, Total=37442 [2020-07-20 14:39:33,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2020-07-20 14:39:33,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 400. [2020-07-20 14:39:33,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-20 14:39:33,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 426 transitions. [2020-07-20 14:39:33,587 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 426 transitions. Word has length 487 [2020-07-20 14:39:33,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:39:33,587 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 426 transitions. [2020-07-20 14:39:33,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 146 states. [2020-07-20 14:39:33,587 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 426 transitions. [2020-07-20 14:39:33,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-20 14:39:33,590 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:39:33,590 INFO L422 BasicCegarLoop]: trace histogram [49, 48, 48, 48, 48, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:39:33,790 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:39:33,791 INFO L427 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:39:33,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:39:33,792 INFO L82 PathProgramCache]: Analyzing trace with hash 1713263950, now seen corresponding path program 71 times [2020-07-20 14:39:33,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:39:33,792 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1744171951] [2020-07-20 14:39:33,793 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 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:39:34,020 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:39:34,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:39:34,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 1322 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-20 14:39:34,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:39:39,343 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:39:39,700 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 14:39:39,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:39:39,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:39:50,191 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 14:39:50,191 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1744171951] [2020-07-20 14:39:50,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:39:50,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 54 [2020-07-20 14:39:50,192 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891807691] [2020-07-20 14:39:50,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-07-20 14:39:50,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:39:50,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-07-20 14:39:50,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1330, Invalid=1532, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 14:39:50,194 INFO L87 Difference]: Start difference. First operand 400 states and 426 transitions. Second operand 54 states. [2020-07-20 14:39:52,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:39:52,508 INFO L93 Difference]: Finished difference Result 419 states and 447 transitions. [2020-07-20 14:39:52,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-20 14:39:52,513 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 489 [2020-07-20 14:39:52,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:39:52,515 INFO L225 Difference]: With dead ends: 419 [2020-07-20 14:39:52,516 INFO L226 Difference]: Without dead ends: 417 [2020-07-20 14:39:52,516 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 829 SyntacticMatches, 96 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2639 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=1334, Invalid=1636, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 14:39:52,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2020-07-20 14:39:52,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 412. [2020-07-20 14:39:52,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 412 states. [2020-07-20 14:39:52,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 439 transitions. [2020-07-20 14:39:52,534 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 439 transitions. Word has length 489 [2020-07-20 14:39:52,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:39:52,534 INFO L479 AbstractCegarLoop]: Abstraction has 412 states and 439 transitions. [2020-07-20 14:39:52,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-07-20 14:39:52,535 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 439 transitions. [2020-07-20 14:39:52,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-20 14:39:52,537 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:39:52,537 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:39:52,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:39:52,739 INFO L427 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:39:52,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:39:52,740 INFO L82 PathProgramCache]: Analyzing trace with hash -831186128, now seen corresponding path program 72 times [2020-07-20 14:39:52,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:39:52,740 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941583929] [2020-07-20 14:39:52,740 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 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:39:52,946 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:39:52,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:39:52,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 1200 conjuncts, 100 conjunts are in the unsatisfiable core [2020-07-20 14:39:52,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:40:09,296 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 5088 proven. 2352 refuted. 0 times theorem prover too weak. 4516 trivial. 0 not checked. [2020-07-20 14:40:09,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:40:28,616 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 4898 proven. 2352 refuted. 0 times theorem prover too weak. 4706 trivial. 0 not checked. [2020-07-20 14:40:28,617 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941583929] [2020-07-20 14:40:28,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:40:28,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100] total 149 [2020-07-20 14:40:28,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379701944] [2020-07-20 14:40:28,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 149 states [2020-07-20 14:40:28,618 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:40:28,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2020-07-20 14:40:28,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5048, Invalid=17004, Unknown=0, NotChecked=0, Total=22052 [2020-07-20 14:40:28,621 INFO L87 Difference]: Start difference. First operand 412 states and 439 transitions. Second operand 149 states. [2020-07-20 14:40:48,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:40:48,721 INFO L93 Difference]: Finished difference Result 819 states and 993 transitions. [2020-07-20 14:40:48,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-20 14:40:48,721 INFO L78 Accepts]: Start accepts. Automaton has 149 states. Word has length 505 [2020-07-20 14:40:48,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:40:48,724 INFO L225 Difference]: With dead ends: 819 [2020-07-20 14:40:48,724 INFO L226 Difference]: Without dead ends: 610 [2020-07-20 14:40:48,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1058 GetRequests, 813 SyntacticMatches, 49 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10536 ImplicationChecksByTransitivity, 43.1s TimeCoverageRelationStatistics Valid=9997, Invalid=29009, Unknown=0, NotChecked=0, Total=39006 [2020-07-20 14:40:48,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2020-07-20 14:40:48,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 414. [2020-07-20 14:40:48,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2020-07-20 14:40:48,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 441 transitions. [2020-07-20 14:40:48,744 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 441 transitions. Word has length 505 [2020-07-20 14:40:48,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:40:48,744 INFO L479 AbstractCegarLoop]: Abstraction has 414 states and 441 transitions. [2020-07-20 14:40:48,744 INFO L480 AbstractCegarLoop]: Interpolant automaton has 149 states. [2020-07-20 14:40:48,744 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 441 transitions. [2020-07-20 14:40:48,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 14:40:48,748 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:40:48,748 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 50, 49, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:40:48,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:40:48,949 INFO L427 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:40:48,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:40:48,950 INFO L82 PathProgramCache]: Analyzing trace with hash 1643039189, now seen corresponding path program 73 times [2020-07-20 14:40:48,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:40:48,950 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1268480585] [2020-07-20 14:40:48,951 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 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:40:49,164 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:40:49,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:40:49,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 1208 conjuncts, 102 conjunts are in the unsatisfiable core [2020-07-20 14:40:49,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:41:04,978 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 14:41:04,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:41:23,391 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 14:41:23,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1268480585] [2020-07-20 14:41:23,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:41:23,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102] total 152 [2020-07-20 14:41:23,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964722182] [2020-07-20 14:41:23,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2020-07-20 14:41:23,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:41:23,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2020-07-20 14:41:23,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5251, Invalid=17701, Unknown=0, NotChecked=0, Total=22952 [2020-07-20 14:41:23,395 INFO L87 Difference]: Start difference. First operand 414 states and 441 transitions. Second operand 152 states. [2020-07-20 14:41:44,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:41:44,391 INFO L93 Difference]: Finished difference Result 823 states and 1000 transitions. [2020-07-20 14:41:44,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2020-07-20 14:41:44,391 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 507 [2020-07-20 14:41:44,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:41:44,394 INFO L225 Difference]: With dead ends: 823 [2020-07-20 14:41:44,394 INFO L226 Difference]: Without dead ends: 616 [2020-07-20 14:41:44,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1063 GetRequests, 813 SyntacticMatches, 50 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10976 ImplicationChecksByTransitivity, 41.7s TimeCoverageRelationStatistics Valid=10401, Invalid=30201, Unknown=0, NotChecked=0, Total=40602 [2020-07-20 14:41:44,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2020-07-20 14:41:44,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 416. [2020-07-20 14:41:44,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 416 states. [2020-07-20 14:41:44,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 443 transitions. [2020-07-20 14:41:44,413 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 443 transitions. Word has length 507 [2020-07-20 14:41:44,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:41:44,413 INFO L479 AbstractCegarLoop]: Abstraction has 416 states and 443 transitions. [2020-07-20 14:41:44,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 152 states. [2020-07-20 14:41:44,414 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 443 transitions. [2020-07-20 14:41:44,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2020-07-20 14:41:44,417 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:41:44,417 INFO L422 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 50, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:41:44,618 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:41:44,619 INFO L427 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:41:44,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:41:44,619 INFO L82 PathProgramCache]: Analyzing trace with hash -38313158, now seen corresponding path program 74 times [2020-07-20 14:41:44,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:41:44,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1585450724] [2020-07-20 14:41:44,620 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 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:41:44,840 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:41:44,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:41:44,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 1376 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-20 14:41:44,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:41:50,233 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:41:50,601 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 14:41:50,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:41:50,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:42:02,359 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 14:42:02,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1585450724] [2020-07-20 14:42:02,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:42:02,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55] total 56 [2020-07-20 14:42:02,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189239533] [2020-07-20 14:42:02,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-20 14:42:02,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:42:02,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-20 14:42:02,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1435, Invalid=1645, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 14:42:02,362 INFO L87 Difference]: Start difference. First operand 416 states and 443 transitions. Second operand 56 states. [2020-07-20 14:42:04,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:42:04,787 INFO L93 Difference]: Finished difference Result 435 states and 464 transitions. [2020-07-20 14:42:04,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-20 14:42:04,792 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 509 [2020-07-20 14:42:04,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:42:04,796 INFO L225 Difference]: With dead ends: 435 [2020-07-20 14:42:04,796 INFO L226 Difference]: Without dead ends: 433 [2020-07-20 14:42:04,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1018 GetRequests, 863 SyntacticMatches, 100 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2849 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=1439, Invalid=1753, Unknown=0, NotChecked=0, Total=3192 [2020-07-20 14:42:04,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2020-07-20 14:42:04,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 428. [2020-07-20 14:42:04,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 428 states. [2020-07-20 14:42:04,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 456 transitions. [2020-07-20 14:42:04,823 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 456 transitions. Word has length 509 [2020-07-20 14:42:04,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:42:04,823 INFO L479 AbstractCegarLoop]: Abstraction has 428 states and 456 transitions. [2020-07-20 14:42:04,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-20 14:42:04,823 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 456 transitions. [2020-07-20 14:42:04,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 526 [2020-07-20 14:42:04,826 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:42:04,826 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 51, 51, 51, 51, 51, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:42:05,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:42:05,032 INFO L427 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:42:05,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:42:05,033 INFO L82 PathProgramCache]: Analyzing trace with hash 283955484, now seen corresponding path program 75 times [2020-07-20 14:42:05,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:42:05,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1707996126] [2020-07-20 14:42:05,034 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 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:42:05,236 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:42:05,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:42:05,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 1248 conjuncts, 104 conjunts are in the unsatisfiable core [2020-07-20 14:42:05,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:42:23,683 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5500 proven. 2550 refuted. 0 times theorem prover too weak. 4904 trivial. 0 not checked. [2020-07-20 14:42:23,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:42:46,664 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5302 proven. 2550 refuted. 0 times theorem prover too weak. 5102 trivial. 0 not checked. [2020-07-20 14:42:46,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1707996126] [2020-07-20 14:42:46,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:42:46,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104] total 155 [2020-07-20 14:42:46,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387530852] [2020-07-20 14:42:46,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2020-07-20 14:42:46,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:42:46,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2020-07-20 14:42:46,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5458, Invalid=18412, Unknown=0, NotChecked=0, Total=23870 [2020-07-20 14:42:46,668 INFO L87 Difference]: Start difference. First operand 428 states and 456 transitions. Second operand 155 states. [2020-07-20 14:43:12,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:43:12,280 INFO L93 Difference]: Finished difference Result 851 states and 1032 transitions. [2020-07-20 14:43:12,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2020-07-20 14:43:12,280 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 525 [2020-07-20 14:43:12,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:43:12,283 INFO L225 Difference]: With dead ends: 851 [2020-07-20 14:43:12,284 INFO L226 Difference]: Without dead ends: 634 [2020-07-20 14:43:12,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1100 GetRequests, 845 SyntacticMatches, 51 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11425 ImplicationChecksByTransitivity, 50.8s TimeCoverageRelationStatistics Valid=10813, Invalid=31417, Unknown=0, NotChecked=0, Total=42230 [2020-07-20 14:43:12,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2020-07-20 14:43:12,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 430. [2020-07-20 14:43:12,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 430 states. [2020-07-20 14:43:12,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 458 transitions. [2020-07-20 14:43:12,313 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 458 transitions. Word has length 525 [2020-07-20 14:43:12,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:43:12,314 INFO L479 AbstractCegarLoop]: Abstraction has 430 states and 458 transitions. [2020-07-20 14:43:12,314 INFO L480 AbstractCegarLoop]: Interpolant automaton has 155 states. [2020-07-20 14:43:12,314 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 458 transitions. [2020-07-20 14:43:12,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 528 [2020-07-20 14:43:12,318 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:43:12,318 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 52, 51, 51, 51, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:43:12,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:43:12,534 INFO L427 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:43:12,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:43:12,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1129954113, now seen corresponding path program 76 times [2020-07-20 14:43:12,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:43:12,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [379342411] [2020-07-20 14:43:12,534 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 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:43:12,734 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:43:12,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:43:12,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 1255 conjuncts, 106 conjunts are in the unsatisfiable core [2020-07-20 14:43:12,744 INFO L286 TraceCheckSpWp]: Computing forward predicates...