/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 BIGGEST_EQUIVALENCE_CLASS --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/nested9.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:20:00,693 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:20:00,695 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:20:00,708 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:20:00,708 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:20:00,709 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:20:00,711 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:20:00,712 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:20:00,714 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:20:00,715 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:20:00,716 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:20:00,717 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:20:00,717 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:20:00,719 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:20:00,720 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:20:00,721 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:20:00,722 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:20:00,723 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:20:00,725 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:20:00,727 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:20:00,729 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:20:00,730 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:20:00,731 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:20:00,732 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:20:00,735 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 23:20:00,744 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:20:00,745 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:20:00,745 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:20:00,746 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 23:20:00,762 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:20:00,762 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:20:00,763 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:20:00,764 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:20:00,764 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:20:00,764 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:20:00,764 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:20:00,765 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:20:00,765 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:20:00,765 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:20:00,765 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:20:00,765 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:20:00,765 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:20:00,766 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:20:00,766 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:20:00,766 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:20:00,766 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:20:00,766 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:20:00,767 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:20:00,767 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:20:00,767 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:20:00,767 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:20:00,768 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:20:00,768 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:20:00,768 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:20:00,768 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:20:00,768 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:00,769 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:20:00,769 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:20:00,769 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 23:20:01,056 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:20:01,078 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:20:01,082 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:20:01,083 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:20:01,083 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:20:01,085 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/nested9.i [2020-07-21 23:20:01,174 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3a3e5643c/5b85f66add904956a3bccdbecd6ed9fc/FLAG239e740dc [2020-07-21 23:20:01,621 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:20:01,622 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested9.i [2020-07-21 23:20:01,629 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3a3e5643c/5b85f66add904956a3bccdbecd6ed9fc/FLAG239e740dc [2020-07-21 23:20:01,998 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3a3e5643c/5b85f66add904956a3bccdbecd6ed9fc [2020-07-21 23:20:02,008 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:20:02,010 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:20:02,011 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:20:02,012 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:20:02,015 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:20:02,017 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:20:01" (1/1) ... [2020-07-21 23:20:02,020 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@402bb5e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:20:02, skipping insertion in model container [2020-07-21 23:20:02,020 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:20:01" (1/1) ... [2020-07-21 23:20:02,028 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:20:02,047 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:20:02,218 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:20:02,225 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:20:02,245 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:20:02,261 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:20:02,262 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:20:02 WrapperNode [2020-07-21 23:20:02,262 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:20:02,263 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:20:02,263 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:20:02,264 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:20:02,279 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:20:02" (1/1) ... [2020-07-21 23:20:02,279 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:20:02" (1/1) ... [2020-07-21 23:20:02,286 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:20:02" (1/1) ... [2020-07-21 23:20:02,286 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:20:02" (1/1) ... [2020-07-21 23:20:02,291 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:20:02" (1/1) ... [2020-07-21 23:20:02,298 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:20:02" (1/1) ... [2020-07-21 23:20:02,299 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:20:02" (1/1) ... [2020-07-21 23:20:02,301 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:20:02,302 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:20:02,302 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:20:02,302 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:20:02,303 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:20:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:20:02,477 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:20:02,477 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:20:02,478 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 23:20:02,478 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 23:20:02,478 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:20:02,479 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:20:02,480 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 23:20:02,480 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 23:20:02,480 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 23:20:02,480 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 23:20:02,481 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:20:02,481 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:20:02,482 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:20:02,836 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:20:02,836 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 23:20:02,844 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:20:02 BoogieIcfgContainer [2020-07-21 23:20:02,847 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:20:02,849 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:20:02,849 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:20:02,860 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:20:02,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:20:01" (1/3) ... [2020-07-21 23:20:02,865 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@245644c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:20:02, skipping insertion in model container [2020-07-21 23:20:02,866 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:20:02" (2/3) ... [2020-07-21 23:20:02,866 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@245644c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:20:02, skipping insertion in model container [2020-07-21 23:20:02,866 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:20:02" (3/3) ... [2020-07-21 23:20:02,868 INFO L109 eAbstractionObserver]: Analyzing ICFG nested9.i [2020-07-21 23:20:02,893 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:20:02,902 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:20:02,920 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:20:02,948 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:20:02,948 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:20:02,948 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:20:02,948 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:20:02,949 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:20:02,949 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:20:02,949 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:20:02,949 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:20:02,972 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-21 23:20:02,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 23:20:02,980 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:02,981 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:02,982 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:02,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:02,988 INFO L82 PathProgramCache]: Analyzing trace with hash 1671060194, now seen corresponding path program 1 times [2020-07-21 23:20:02,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:02,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250448320] [2020-07-21 23:20:02,999 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 [2020-07-21 23:20:03,109 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:20:03,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:03,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 23:20:03,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:03,183 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:20:03,183 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:20:03,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250448320] [2020-07-21 23:20:03,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:20:03,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:20:03,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376111071] [2020-07-21 23:20:03,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:20:03,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:03,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:20:03,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:20:03,208 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 4 states. [2020-07-21 23:20:03,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:03,275 INFO L93 Difference]: Finished difference Result 53 states and 74 transitions. [2020-07-21 23:20:03,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:20:03,277 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-07-21 23:20:03,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:03,288 INFO L225 Difference]: With dead ends: 53 [2020-07-21 23:20:03,288 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 23:20:03,293 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:20:03,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 23:20:03,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2020-07-21 23:20:03,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 23:20:03,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-07-21 23:20:03,341 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2020-07-21 23:20:03,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:03,342 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-07-21 23:20:03,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:20:03,342 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-07-21 23:20:03,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 23:20:03,344 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:03,344 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:03,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:03,545 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:03,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:03,547 INFO L82 PathProgramCache]: Analyzing trace with hash 514965223, now seen corresponding path program 1 times [2020-07-21 23:20:03,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:03,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1761348271] [2020-07-21 23:20:03,549 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 [2020-07-21 23:20:03,603 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:03,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:03,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 23:20:03,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:03,669 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:20:03,676 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:20:03,716 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:20:03,716 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:20:03,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1761348271] [2020-07-21 23:20:03,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:20:03,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 23:20:03,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010222765] [2020-07-21 23:20:03,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 23:20:03,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:03,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 23:20:03,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 23:20:03,720 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 8 states. [2020-07-21 23:20:03,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:03,832 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2020-07-21 23:20:03,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 23:20:03,833 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-07-21 23:20:03,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:03,835 INFO L225 Difference]: With dead ends: 39 [2020-07-21 23:20:03,835 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 23:20:03,836 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 23:20:03,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 23:20:03,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 32. [2020-07-21 23:20:03,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 23:20:03,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 23:20:03,845 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 21 [2020-07-21 23:20:03,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:03,846 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 23:20:03,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 23:20:03,846 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 23:20:03,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 23:20:03,847 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:03,848 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, 1] [2020-07-21 23:20:04,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:04,062 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:04,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:04,063 INFO L82 PathProgramCache]: Analyzing trace with hash -1134636734, now seen corresponding path program 1 times [2020-07-21 23:20:04,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:04,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1534117114] [2020-07-21 23:20:04,065 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 [2020-07-21 23:20:04,128 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:04,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:04,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 23:20:04,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:04,218 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:20:04,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:04,331 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:20:04,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1534117114] [2020-07-21 23:20:04,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:04,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 23:20:04,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457300109] [2020-07-21 23:20:04,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 23:20:04,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:04,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 23:20:04,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-07-21 23:20:04,338 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 10 states. [2020-07-21 23:20:04,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:04,607 INFO L93 Difference]: Finished difference Result 65 states and 77 transitions. [2020-07-21 23:20:04,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 23:20:04,608 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-07-21 23:20:04,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:04,612 INFO L225 Difference]: With dead ends: 65 [2020-07-21 23:20:04,612 INFO L226 Difference]: Without dead ends: 46 [2020-07-21 23:20:04,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=65, Invalid=145, Unknown=0, NotChecked=0, Total=210 [2020-07-21 23:20:04,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-07-21 23:20:04,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 41. [2020-07-21 23:20:04,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 23:20:04,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2020-07-21 23:20:04,627 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 28 [2020-07-21 23:20:04,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:04,629 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2020-07-21 23:20:04,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 23:20:04,629 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2020-07-21 23:20:04,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 23:20:04,631 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:04,632 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:04,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:04,847 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:04,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:04,848 INFO L82 PathProgramCache]: Analyzing trace with hash 848296232, now seen corresponding path program 1 times [2020-07-21 23:20:04,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:04,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541894228] [2020-07-21 23:20:04,850 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 [2020-07-21 23:20:04,883 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:20:04,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:04,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:20:04,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:04,939 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 23:20:04,939 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:20:04,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541894228] [2020-07-21 23:20:04,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:20:04,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 23:20:04,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840162718] [2020-07-21 23:20:04,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 23:20:04,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:04,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 23:20:04,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-07-21 23:20:04,942 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand 6 states. [2020-07-21 23:20:05,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:05,019 INFO L93 Difference]: Finished difference Result 68 states and 81 transitions. [2020-07-21 23:20:05,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 23:20:05,020 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2020-07-21 23:20:05,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:05,022 INFO L225 Difference]: With dead ends: 68 [2020-07-21 23:20:05,022 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 23:20:05,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-21 23:20:05,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 23:20:05,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2020-07-21 23:20:05,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 23:20:05,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2020-07-21 23:20:05,032 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 34 [2020-07-21 23:20:05,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:05,032 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2020-07-21 23:20:05,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 23:20:05,033 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2020-07-21 23:20:05,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 23:20:05,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:05,034 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:05,248 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:05,249 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:05,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:05,249 INFO L82 PathProgramCache]: Analyzing trace with hash -670641491, now seen corresponding path program 2 times [2020-07-21 23:20:05,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:05,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1256514277] [2020-07-21 23:20:05,250 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 [2020-07-21 23:20:05,284 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:05,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:05,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 23:20:05,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:05,365 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:20:05,368 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:20:05,397 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 23:20:05,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:05,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:20:05,500 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 23:20:05,500 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1256514277] [2020-07-21 23:20:05,501 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:05,501 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-21 23:20:05,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013746] [2020-07-21 23:20:05,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 23:20:05,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:05,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 23:20:05,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2020-07-21 23:20:05,503 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand 15 states. [2020-07-21 23:20:05,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:05,900 INFO L93 Difference]: Finished difference Result 78 states and 94 transitions. [2020-07-21 23:20:05,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 23:20:05,900 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 41 [2020-07-21 23:20:05,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:05,903 INFO L225 Difference]: With dead ends: 78 [2020-07-21 23:20:05,903 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 23:20:05,904 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 65 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=179, Invalid=373, Unknown=0, NotChecked=0, Total=552 [2020-07-21 23:20:05,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 23:20:05,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 54. [2020-07-21 23:20:05,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 23:20:05,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2020-07-21 23:20:05,917 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 41 [2020-07-21 23:20:05,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:05,918 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2020-07-21 23:20:05,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 23:20:05,918 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2020-07-21 23:20:05,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-21 23:20:05,920 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:05,921 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:06,135 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:06,136 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:06,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:06,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1941695900, now seen corresponding path program 3 times [2020-07-21 23:20:06,138 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:06,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [983246012] [2020-07-21 23:20:06,140 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 [2020-07-21 23:20:06,180 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:20:06,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:06,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 23:20:06,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:06,286 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 60 proven. 19 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2020-07-21 23:20:06,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:06,366 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 40 proven. 19 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2020-07-21 23:20:06,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [983246012] [2020-07-21 23:20:06,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:06,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2020-07-21 23:20:06,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122368578] [2020-07-21 23:20:06,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 23:20:06,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:06,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 23:20:06,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2020-07-21 23:20:06,369 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand 13 states. [2020-07-21 23:20:06,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:06,846 INFO L93 Difference]: Finished difference Result 127 states and 164 transitions. [2020-07-21 23:20:06,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 23:20:06,849 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 62 [2020-07-21 23:20:06,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:06,852 INFO L225 Difference]: With dead ends: 127 [2020-07-21 23:20:06,853 INFO L226 Difference]: Without dead ends: 95 [2020-07-21 23:20:06,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 109 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=169, Invalid=431, Unknown=0, NotChecked=0, Total=600 [2020-07-21 23:20:06,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-21 23:20:06,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 64. [2020-07-21 23:20:06,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 23:20:06,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 78 transitions. [2020-07-21 23:20:06,889 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 78 transitions. Word has length 62 [2020-07-21 23:20:06,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:06,890 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 78 transitions. [2020-07-21 23:20:06,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 23:20:06,890 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 78 transitions. [2020-07-21 23:20:06,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-07-21 23:20:06,901 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:06,901 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:07,115 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:07,116 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:07,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:07,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1583260034, now seen corresponding path program 4 times [2020-07-21 23:20:07,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:07,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [630771251] [2020-07-21 23:20:07,119 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 [2020-07-21 23:20:07,156 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:20:07,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:07,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 23:20:07,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:07,255 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 88 proven. 7 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 23:20:07,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:07,333 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 61 proven. 10 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 23:20:07,333 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [630771251] [2020-07-21 23:20:07,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:07,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-21 23:20:07,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482779436] [2020-07-21 23:20:07,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 23:20:07,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:07,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 23:20:07,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2020-07-21 23:20:07,336 INFO L87 Difference]: Start difference. First operand 64 states and 78 transitions. Second operand 11 states. [2020-07-21 23:20:07,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:07,525 INFO L93 Difference]: Finished difference Result 123 states and 153 transitions. [2020-07-21 23:20:07,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 23:20:07,531 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 72 [2020-07-21 23:20:07,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:07,532 INFO L225 Difference]: With dead ends: 123 [2020-07-21 23:20:07,532 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 23:20:07,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 131 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-07-21 23:20:07,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 23:20:07,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-07-21 23:20:07,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 23:20:07,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2020-07-21 23:20:07,546 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 72 [2020-07-21 23:20:07,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:07,546 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2020-07-21 23:20:07,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 23:20:07,547 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2020-07-21 23:20:07,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-21 23:20:07,548 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:07,548 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:07,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:07,762 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:07,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:07,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1833574291, now seen corresponding path program 5 times [2020-07-21 23:20:07,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:07,764 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1678333927] [2020-07-21 23:20:07,764 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 [2020-07-21 23:20:07,807 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:07,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:07,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 23:20:07,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:07,959 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 75 proven. 62 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-07-21 23:20:07,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:08,075 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 53 proven. 62 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2020-07-21 23:20:08,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1678333927] [2020-07-21 23:20:08,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:08,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2020-07-21 23:20:08,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537130421] [2020-07-21 23:20:08,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 23:20:08,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:08,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 23:20:08,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 23:20:08,078 INFO L87 Difference]: Start difference. First operand 64 states and 74 transitions. Second operand 17 states. [2020-07-21 23:20:08,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:08,784 INFO L93 Difference]: Finished difference Result 132 states and 162 transitions. [2020-07-21 23:20:08,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 23:20:08,785 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 79 [2020-07-21 23:20:08,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:08,787 INFO L225 Difference]: With dead ends: 132 [2020-07-21 23:20:08,787 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 23:20:08,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=307, Invalid=815, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 23:20:08,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 23:20:08,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 78. [2020-07-21 23:20:08,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-21 23:20:08,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 94 transitions. [2020-07-21 23:20:08,829 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 94 transitions. Word has length 79 [2020-07-21 23:20:08,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:08,830 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 94 transitions. [2020-07-21 23:20:08,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 23:20:08,830 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 94 transitions. [2020-07-21 23:20:08,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-07-21 23:20:08,835 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:08,835 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:09,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:09,051 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:09,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:09,052 INFO L82 PathProgramCache]: Analyzing trace with hash -832577267, now seen corresponding path program 6 times [2020-07-21 23:20:09,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:09,053 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1726921810] [2020-07-21 23:20:09,054 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:09,096 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:20:09,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:09,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 23:20:09,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:09,232 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 216 proven. 32 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-21 23:20:09,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:09,366 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 127 proven. 49 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2020-07-21 23:20:09,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1726921810] [2020-07-21 23:20:09,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:09,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-21 23:20:09,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912632147] [2020-07-21 23:20:09,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 23:20:09,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:09,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 23:20:09,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2020-07-21 23:20:09,369 INFO L87 Difference]: Start difference. First operand 78 states and 94 transitions. Second operand 15 states. [2020-07-21 23:20:09,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:09,742 INFO L93 Difference]: Finished difference Result 140 states and 176 transitions. [2020-07-21 23:20:09,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 23:20:09,742 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 99 [2020-07-21 23:20:09,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:09,744 INFO L225 Difference]: With dead ends: 140 [2020-07-21 23:20:09,744 INFO L226 Difference]: Without dead ends: 96 [2020-07-21 23:20:09,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 181 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=381, Unknown=0, NotChecked=0, Total=552 [2020-07-21 23:20:09,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-07-21 23:20:09,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 86. [2020-07-21 23:20:09,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-21 23:20:09,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 104 transitions. [2020-07-21 23:20:09,761 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 104 transitions. Word has length 99 [2020-07-21 23:20:09,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:09,761 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 104 transitions. [2020-07-21 23:20:09,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 23:20:09,762 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 104 transitions. [2020-07-21 23:20:09,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 23:20:09,763 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:09,763 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:09,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:09,978 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:09,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:09,979 INFO L82 PathProgramCache]: Analyzing trace with hash -1419871984, now seen corresponding path program 7 times [2020-07-21 23:20:09,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:09,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1084072000] [2020-07-21 23:20:09,980 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:10,025 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:10,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:10,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 23:20:10,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:10,128 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 106 proven. 124 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-07-21 23:20:10,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:10,269 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 72 proven. 124 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2020-07-21 23:20:10,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1084072000] [2020-07-21 23:20:10,270 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:10,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2020-07-21 23:20:10,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759827447] [2020-07-21 23:20:10,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 23:20:10,271 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:10,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 23:20:10,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2020-07-21 23:20:10,271 INFO L87 Difference]: Start difference. First operand 86 states and 104 transitions. Second operand 16 states. [2020-07-21 23:20:11,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:11,099 INFO L93 Difference]: Finished difference Result 169 states and 212 transitions. [2020-07-21 23:20:11,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 23:20:11,099 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 106 [2020-07-21 23:20:11,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:11,102 INFO L225 Difference]: With dead ends: 169 [2020-07-21 23:20:11,102 INFO L226 Difference]: Without dead ends: 122 [2020-07-21 23:20:11,107 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 193 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=395, Invalid=1165, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 23:20:11,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-21 23:20:11,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 99. [2020-07-21 23:20:11,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-07-21 23:20:11,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 121 transitions. [2020-07-21 23:20:11,132 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 121 transitions. Word has length 106 [2020-07-21 23:20:11,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:11,132 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 121 transitions. [2020-07-21 23:20:11,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 23:20:11,133 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 121 transitions. [2020-07-21 23:20:11,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-21 23:20:11,134 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:11,134 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:11,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:11,349 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:11,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:11,350 INFO L82 PathProgramCache]: Analyzing trace with hash 1976134303, now seen corresponding path program 8 times [2020-07-21 23:20:11,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:11,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [263384123] [2020-07-21 23:20:11,351 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 [2020-07-21 23:20:11,396 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:20:11,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:11,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 23:20:11,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:11,513 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 338 proven. 56 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2020-07-21 23:20:11,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:11,646 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 212 proven. 62 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2020-07-21 23:20:11,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [263384123] [2020-07-21 23:20:11,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:11,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-21 23:20:11,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979757787] [2020-07-21 23:20:11,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 23:20:11,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:11,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 23:20:11,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2020-07-21 23:20:11,649 INFO L87 Difference]: Start difference. First operand 99 states and 121 transitions. Second operand 14 states. [2020-07-21 23:20:11,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:11,942 INFO L93 Difference]: Finished difference Result 186 states and 230 transitions. [2020-07-21 23:20:11,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 23:20:11,943 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 123 [2020-07-21 23:20:11,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:11,944 INFO L225 Difference]: With dead ends: 186 [2020-07-21 23:20:11,945 INFO L226 Difference]: Without dead ends: 99 [2020-07-21 23:20:11,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 229 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-07-21 23:20:11,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-21 23:20:11,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 91. [2020-07-21 23:20:11,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-07-21 23:20:11,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 107 transitions. [2020-07-21 23:20:11,959 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 107 transitions. Word has length 123 [2020-07-21 23:20:11,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:11,960 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 107 transitions. [2020-07-21 23:20:11,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 23:20:11,960 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 107 transitions. [2020-07-21 23:20:11,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-07-21 23:20:11,962 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:11,962 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:12,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:12,178 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:12,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:12,178 INFO L82 PathProgramCache]: Analyzing trace with hash -1688384554, now seen corresponding path program 9 times [2020-07-21 23:20:12,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:12,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944598682] [2020-07-21 23:20:12,179 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 [2020-07-21 23:20:12,232 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:12,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:12,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 23:20:12,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:12,378 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 61 proven. 271 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2020-07-21 23:20:12,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:12,563 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 61 proven. 271 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2020-07-21 23:20:12,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944598682] [2020-07-21 23:20:12,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:12,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 20 [2020-07-21 23:20:12,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473337577] [2020-07-21 23:20:12,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 23:20:12,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:12,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 23:20:12,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=295, Unknown=0, NotChecked=0, Total=380 [2020-07-21 23:20:12,567 INFO L87 Difference]: Start difference. First operand 91 states and 107 transitions. Second operand 20 states. [2020-07-21 23:20:13,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:13,956 INFO L93 Difference]: Finished difference Result 177 states and 219 transitions. [2020-07-21 23:20:13,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 23:20:13,958 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 130 [2020-07-21 23:20:13,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:13,959 INFO L225 Difference]: With dead ends: 177 [2020-07-21 23:20:13,960 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 23:20:13,962 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 237 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 676 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=634, Invalid=1916, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 23:20:13,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 23:20:13,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 106. [2020-07-21 23:20:13,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-21 23:20:13,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 127 transitions. [2020-07-21 23:20:13,983 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 127 transitions. Word has length 130 [2020-07-21 23:20:13,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:13,983 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 127 transitions. [2020-07-21 23:20:13,984 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 23:20:13,984 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 127 transitions. [2020-07-21 23:20:13,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2020-07-21 23:20:13,985 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:13,986 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 16, 16, 16, 16, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:14,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:14,199 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:14,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:14,200 INFO L82 PathProgramCache]: Analyzing trace with hash -840848228, now seen corresponding path program 10 times [2020-07-21 23:20:14,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:14,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [375501783] [2020-07-21 23:20:14,201 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 [2020-07-21 23:20:14,259 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:14,259 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:14,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 23:20:14,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:14,414 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 555 proven. 118 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2020-07-21 23:20:14,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:14,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 284 proven. 205 refuted. 0 times theorem prover too weak. 565 trivial. 0 not checked. [2020-07-21 23:20:14,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [375501783] [2020-07-21 23:20:14,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:14,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18 [2020-07-21 23:20:14,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105765532] [2020-07-21 23:20:14,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 23:20:14,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:14,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 23:20:14,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2020-07-21 23:20:14,600 INFO L87 Difference]: Start difference. First operand 106 states and 127 transitions. Second operand 18 states. [2020-07-21 23:20:15,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:15,084 INFO L93 Difference]: Finished difference Result 155 states and 189 transitions. [2020-07-21 23:20:15,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 23:20:15,085 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 154 [2020-07-21 23:20:15,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:15,087 INFO L225 Difference]: With dead ends: 155 [2020-07-21 23:20:15,087 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 23:20:15,088 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 287 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=256, Invalid=614, Unknown=0, NotChecked=0, Total=870 [2020-07-21 23:20:15,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 23:20:15,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 117. [2020-07-21 23:20:15,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-07-21 23:20:15,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 141 transitions. [2020-07-21 23:20:15,103 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 141 transitions. Word has length 154 [2020-07-21 23:20:15,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:15,104 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 141 transitions. [2020-07-21 23:20:15,104 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 23:20:15,104 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 141 transitions. [2020-07-21 23:20:15,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2020-07-21 23:20:15,106 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:15,106 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:15,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:15,316 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:15,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:15,317 INFO L82 PathProgramCache]: Analyzing trace with hash 1311982393, now seen corresponding path program 11 times [2020-07-21 23:20:15,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:15,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [263098482] [2020-07-21 23:20:15,318 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 [2020-07-21 23:20:15,379 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:15,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:15,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 23:20:15,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:15,512 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:20:15,513 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:20:15,564 INFO L134 CoverageAnalysis]: Checked inductivity of 1175 backedges. 476 proven. 26 refuted. 0 times theorem prover too weak. 673 trivial. 0 not checked. [2020-07-21 23:20:15,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:15,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:20:15,778 INFO L134 CoverageAnalysis]: Checked inductivity of 1175 backedges. 80 proven. 422 refuted. 0 times theorem prover too weak. 673 trivial. 0 not checked. [2020-07-21 23:20:15,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [263098482] [2020-07-21 23:20:15,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:15,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 22 [2020-07-21 23:20:15,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160360734] [2020-07-21 23:20:15,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 23:20:15,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:15,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 23:20:15,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=314, Unknown=0, NotChecked=0, Total=462 [2020-07-21 23:20:15,780 INFO L87 Difference]: Start difference. First operand 117 states and 141 transitions. Second operand 22 states. [2020-07-21 23:20:16,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:16,426 INFO L93 Difference]: Finished difference Result 166 states and 209 transitions. [2020-07-21 23:20:16,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 23:20:16,426 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 161 [2020-07-21 23:20:16,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:16,430 INFO L225 Difference]: With dead ends: 166 [2020-07-21 23:20:16,430 INFO L226 Difference]: Without dead ends: 164 [2020-07-21 23:20:16,431 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 297 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 421 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=526, Invalid=1034, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 23:20:16,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2020-07-21 23:20:16,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 136. [2020-07-21 23:20:16,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 23:20:16,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 169 transitions. [2020-07-21 23:20:16,448 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 169 transitions. Word has length 161 [2020-07-21 23:20:16,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:16,448 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 169 transitions. [2020-07-21 23:20:16,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 23:20:16,449 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 169 transitions. [2020-07-21 23:20:16,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2020-07-21 23:20:16,451 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:16,451 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 22, 22, 22, 22, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:16,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:16,667 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:16,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:16,667 INFO L82 PathProgramCache]: Analyzing trace with hash -90659728, now seen corresponding path program 12 times [2020-07-21 23:20:16,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:16,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [153399406] [2020-07-21 23:20:16,668 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 [2020-07-21 23:20:16,737 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:16,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:16,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 23:20:16,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:16,953 INFO L134 CoverageAnalysis]: Checked inductivity of 1885 backedges. 617 proven. 521 refuted. 0 times theorem prover too weak. 747 trivial. 0 not checked. [2020-07-21 23:20:16,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:17,205 INFO L134 CoverageAnalysis]: Checked inductivity of 1885 backedges. 337 proven. 521 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2020-07-21 23:20:17,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [153399406] [2020-07-21 23:20:17,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:17,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 24 [2020-07-21 23:20:17,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710713311] [2020-07-21 23:20:17,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 23:20:17,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:17,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 23:20:17,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2020-07-21 23:20:17,208 INFO L87 Difference]: Start difference. First operand 136 states and 169 transitions. Second operand 24 states. [2020-07-21 23:20:18,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:18,788 INFO L93 Difference]: Finished difference Result 267 states and 343 transitions. [2020-07-21 23:20:18,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 23:20:18,789 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 196 [2020-07-21 23:20:18,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:18,791 INFO L225 Difference]: With dead ends: 267 [2020-07-21 23:20:18,791 INFO L226 Difference]: Without dead ends: 188 [2020-07-21 23:20:18,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 365 SyntacticMatches, 4 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 982 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=931, Invalid=2609, Unknown=0, NotChecked=0, Total=3540 [2020-07-21 23:20:18,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2020-07-21 23:20:18,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 156. [2020-07-21 23:20:18,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-21 23:20:18,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 197 transitions. [2020-07-21 23:20:18,826 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 197 transitions. Word has length 196 [2020-07-21 23:20:18,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:18,826 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 197 transitions. [2020-07-21 23:20:18,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 23:20:18,827 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 197 transitions. [2020-07-21 23:20:18,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2020-07-21 23:20:18,828 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:18,829 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 27, 26, 26, 26, 26, 7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:19,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:19,042 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:19,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:19,043 INFO L82 PathProgramCache]: Analyzing trace with hash -1782452330, now seen corresponding path program 13 times [2020-07-21 23:20:19,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:19,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1728933068] [2020-07-21 23:20:19,044 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 [2020-07-21 23:20:19,107 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:20:19,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:19,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 23:20:19,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:19,315 INFO L134 CoverageAnalysis]: Checked inductivity of 2642 backedges. 1512 proven. 216 refuted. 0 times theorem prover too weak. 914 trivial. 0 not checked. [2020-07-21 23:20:19,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:19,579 INFO L134 CoverageAnalysis]: Checked inductivity of 2642 backedges. 729 proven. 405 refuted. 0 times theorem prover too weak. 1508 trivial. 0 not checked. [2020-07-21 23:20:19,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1728933068] [2020-07-21 23:20:19,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:19,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 22 [2020-07-21 23:20:19,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817162352] [2020-07-21 23:20:19,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 23:20:19,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:19,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 23:20:19,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=356, Unknown=0, NotChecked=0, Total=462 [2020-07-21 23:20:19,582 INFO L87 Difference]: Start difference. First operand 156 states and 197 transitions. Second operand 22 states. [2020-07-21 23:20:20,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:20,311 INFO L93 Difference]: Finished difference Result 289 states and 385 transitions. [2020-07-21 23:20:20,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 23:20:20,312 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 230 [2020-07-21 23:20:20,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:20,314 INFO L225 Difference]: With dead ends: 289 [2020-07-21 23:20:20,315 INFO L226 Difference]: Without dead ends: 209 [2020-07-21 23:20:20,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 435 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=453, Invalid=1107, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 23:20:20,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-21 23:20:20,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 190. [2020-07-21 23:20:20,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 23:20:20,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 248 transitions. [2020-07-21 23:20:20,343 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 248 transitions. Word has length 230 [2020-07-21 23:20:20,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:20,344 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 248 transitions. [2020-07-21 23:20:20,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 23:20:20,344 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 248 transitions. [2020-07-21 23:20:20,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 23:20:20,346 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:20,346 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:20,561 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:20,562 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:20,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:20,562 INFO L82 PathProgramCache]: Analyzing trace with hash -1051553665, now seen corresponding path program 14 times [2020-07-21 23:20:20,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:20,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [858958844] [2020-07-21 23:20:20,563 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:20,653 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:20,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:20,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 23:20:20,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:20,835 INFO L134 CoverageAnalysis]: Checked inductivity of 2834 backedges. 893 proven. 639 refuted. 0 times theorem prover too weak. 1302 trivial. 0 not checked. [2020-07-21 23:20:20,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:21,058 INFO L134 CoverageAnalysis]: Checked inductivity of 2834 backedges. 463 proven. 639 refuted. 0 times theorem prover too weak. 1732 trivial. 0 not checked. [2020-07-21 23:20:21,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [858958844] [2020-07-21 23:20:21,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:21,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 19 [2020-07-21 23:20:21,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112666430] [2020-07-21 23:20:21,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 23:20:21,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:21,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 23:20:21,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2020-07-21 23:20:21,061 INFO L87 Difference]: Start difference. First operand 190 states and 248 transitions. Second operand 19 states. [2020-07-21 23:20:22,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:22,301 INFO L93 Difference]: Finished difference Result 456 states and 609 transitions. [2020-07-21 23:20:22,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-21 23:20:22,301 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 237 [2020-07-21 23:20:22,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:22,304 INFO L225 Difference]: With dead ends: 456 [2020-07-21 23:20:22,305 INFO L226 Difference]: Without dead ends: 353 [2020-07-21 23:20:22,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 451 SyntacticMatches, 5 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=720, Invalid=2360, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 23:20:22,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-21 23:20:22,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 254. [2020-07-21 23:20:22,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-21 23:20:22,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 331 transitions. [2020-07-21 23:20:22,348 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 331 transitions. Word has length 237 [2020-07-21 23:20:22,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:22,349 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 331 transitions. [2020-07-21 23:20:22,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 23:20:22,349 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 331 transitions. [2020-07-21 23:20:22,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2020-07-21 23:20:22,352 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:22,352 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 31, 30, 30, 30, 30, 8, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:22,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:22,565 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:22,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:22,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1090659833, now seen corresponding path program 15 times [2020-07-21 23:20:22,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:22,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [779359656] [2020-07-21 23:20:22,567 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 [2020-07-21 23:20:22,634 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:20:22,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:22,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 23:20:22,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:22,798 INFO L134 CoverageAnalysis]: Checked inductivity of 3506 backedges. 1869 proven. 216 refuted. 0 times theorem prover too weak. 1421 trivial. 0 not checked. [2020-07-21 23:20:22,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:23,010 INFO L134 CoverageAnalysis]: Checked inductivity of 3506 backedges. 1121 proven. 226 refuted. 0 times theorem prover too weak. 2159 trivial. 0 not checked. [2020-07-21 23:20:23,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [779359656] [2020-07-21 23:20:23,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:23,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-21 23:20:23,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204051478] [2020-07-21 23:20:23,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 23:20:23,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:23,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 23:20:23,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=203, Unknown=0, NotChecked=0, Total=272 [2020-07-21 23:20:23,013 INFO L87 Difference]: Start difference. First operand 254 states and 331 transitions. Second operand 17 states. [2020-07-21 23:20:23,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:23,440 INFO L93 Difference]: Finished difference Result 363 states and 479 transitions. [2020-07-21 23:20:23,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 23:20:23,441 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 261 [2020-07-21 23:20:23,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:23,443 INFO L225 Difference]: With dead ends: 363 [2020-07-21 23:20:23,443 INFO L226 Difference]: Without dead ends: 206 [2020-07-21 23:20:23,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 531 GetRequests, 501 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=207, Invalid=495, Unknown=0, NotChecked=0, Total=702 [2020-07-21 23:20:23,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2020-07-21 23:20:23,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 206. [2020-07-21 23:20:23,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-21 23:20:23,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 266 transitions. [2020-07-21 23:20:23,473 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 266 transitions. Word has length 261 [2020-07-21 23:20:23,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:23,474 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 266 transitions. [2020-07-21 23:20:23,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 23:20:23,474 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 266 transitions. [2020-07-21 23:20:23,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2020-07-21 23:20:23,476 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:23,477 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 8, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:23,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:23,692 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:23,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:23,693 INFO L82 PathProgramCache]: Analyzing trace with hash -431748828, now seen corresponding path program 16 times [2020-07-21 23:20:23,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:23,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2133990317] [2020-07-21 23:20:23,694 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 [2020-07-21 23:20:23,778 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:23,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:23,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 23:20:23,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:23,998 INFO L134 CoverageAnalysis]: Checked inductivity of 3727 backedges. 904 proven. 1050 refuted. 0 times theorem prover too weak. 1773 trivial. 0 not checked. [2020-07-21 23:20:23,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:24,259 INFO L134 CoverageAnalysis]: Checked inductivity of 3727 backedges. 480 proven. 1050 refuted. 0 times theorem prover too weak. 2197 trivial. 0 not checked. [2020-07-21 23:20:24,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2133990317] [2020-07-21 23:20:24,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:24,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 23 [2020-07-21 23:20:24,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015000798] [2020-07-21 23:20:24,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 23:20:24,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:24,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 23:20:24,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=395, Unknown=0, NotChecked=0, Total=506 [2020-07-21 23:20:24,261 INFO L87 Difference]: Start difference. First operand 206 states and 266 transitions. Second operand 23 states. [2020-07-21 23:20:26,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:26,519 INFO L93 Difference]: Finished difference Result 373 states and 497 transitions. [2020-07-21 23:20:26,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-07-21 23:20:26,519 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 268 [2020-07-21 23:20:26,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:26,522 INFO L225 Difference]: With dead ends: 373 [2020-07-21 23:20:26,522 INFO L226 Difference]: Without dead ends: 260 [2020-07-21 23:20:26,524 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 588 GetRequests, 509 SyntacticMatches, 5 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1812 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1346, Invalid=4354, Unknown=0, NotChecked=0, Total=5700 [2020-07-21 23:20:26,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2020-07-21 23:20:26,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 224. [2020-07-21 23:20:26,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-21 23:20:26,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 290 transitions. [2020-07-21 23:20:26,562 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 290 transitions. Word has length 268 [2020-07-21 23:20:26,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:26,563 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 290 transitions. [2020-07-21 23:20:26,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 23:20:26,563 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 290 transitions. [2020-07-21 23:20:26,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 23:20:26,566 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:26,566 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 9, 8, 8, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:26,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:26,780 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:26,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:26,781 INFO L82 PathProgramCache]: Analyzing trace with hash -935543841, now seen corresponding path program 17 times [2020-07-21 23:20:26,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:26,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836882544] [2020-07-21 23:20:26,782 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 [2020-07-21 23:20:26,872 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:26,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:26,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 23:20:26,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:27,103 INFO L134 CoverageAnalysis]: Checked inductivity of 4743 backedges. 2497 proven. 343 refuted. 0 times theorem prover too weak. 1903 trivial. 0 not checked. [2020-07-21 23:20:27,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:27,439 INFO L134 CoverageAnalysis]: Checked inductivity of 4743 backedges. 1289 proven. 633 refuted. 0 times theorem prover too weak. 2821 trivial. 0 not checked. [2020-07-21 23:20:27,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836882544] [2020-07-21 23:20:27,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:27,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2020-07-21 23:20:27,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558489326] [2020-07-21 23:20:27,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 23:20:27,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:27,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 23:20:27,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=321, Unknown=0, NotChecked=0, Total=420 [2020-07-21 23:20:27,442 INFO L87 Difference]: Start difference. First operand 224 states and 290 transitions. Second operand 21 states. [2020-07-21 23:20:28,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:28,140 INFO L93 Difference]: Finished difference Result 320 states and 421 transitions. [2020-07-21 23:20:28,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 23:20:28,141 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 299 [2020-07-21 23:20:28,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:28,146 INFO L225 Difference]: With dead ends: 320 [2020-07-21 23:20:28,146 INFO L226 Difference]: Without dead ends: 224 [2020-07-21 23:20:28,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 573 SyntacticMatches, 5 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=384, Invalid=948, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 23:20:28,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2020-07-21 23:20:28,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 193. [2020-07-21 23:20:28,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2020-07-21 23:20:28,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 241 transitions. [2020-07-21 23:20:28,188 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 241 transitions. Word has length 299 [2020-07-21 23:20:28,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:28,189 INFO L479 AbstractCegarLoop]: Abstraction has 193 states and 241 transitions. [2020-07-21 23:20:28,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 23:20:28,190 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 241 transitions. [2020-07-21 23:20:28,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2020-07-21 23:20:28,195 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:28,195 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 37, 36, 36, 36, 36, 9, 8, 8, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:28,409 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:28,410 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:28,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:28,410 INFO L82 PathProgramCache]: Analyzing trace with hash 221652094, now seen corresponding path program 18 times [2020-07-21 23:20:28,411 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:28,411 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [139665729] [2020-07-21 23:20:28,411 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 [2020-07-21 23:20:28,574 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:28,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:28,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 23:20:28,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:28,978 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 870 proven. 1638 refuted. 0 times theorem prover too weak. 2492 trivial. 0 not checked. [2020-07-21 23:20:28,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:29,364 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 480 proven. 1638 refuted. 0 times theorem prover too weak. 2882 trivial. 0 not checked. [2020-07-21 23:20:29,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [139665729] [2020-07-21 23:20:29,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:29,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 27 [2020-07-21 23:20:29,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962566455] [2020-07-21 23:20:29,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 23:20:29,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:29,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 23:20:29,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=556, Unknown=0, NotChecked=0, Total=702 [2020-07-21 23:20:29,367 INFO L87 Difference]: Start difference. First operand 193 states and 241 transitions. Second operand 27 states. [2020-07-21 23:20:32,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:32,155 INFO L93 Difference]: Finished difference Result 335 states and 432 transitions. [2020-07-21 23:20:32,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2020-07-21 23:20:32,156 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 306 [2020-07-21 23:20:32,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:32,158 INFO L225 Difference]: With dead ends: 335 [2020-07-21 23:20:32,158 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 23:20:32,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 669 GetRequests, 581 SyntacticMatches, 5 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2259 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1692, Invalid=5448, Unknown=0, NotChecked=0, Total=7140 [2020-07-21 23:20:32,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 23:20:32,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 214. [2020-07-21 23:20:32,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2020-07-21 23:20:32,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 269 transitions. [2020-07-21 23:20:32,193 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 269 transitions. Word has length 306 [2020-07-21 23:20:32,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:32,194 INFO L479 AbstractCegarLoop]: Abstraction has 214 states and 269 transitions. [2020-07-21 23:20:32,194 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 23:20:32,194 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 269 transitions. [2020-07-21 23:20:32,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2020-07-21 23:20:32,196 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:32,197 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 10, 9, 9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:32,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:32,403 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:32,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:32,404 INFO L82 PathProgramCache]: Analyzing trace with hash 856878168, now seen corresponding path program 19 times [2020-07-21 23:20:32,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:32,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762386495] [2020-07-21 23:20:32,405 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 [2020-07-21 23:20:32,506 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:32,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:32,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 621 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 23:20:32,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:32,869 INFO L134 CoverageAnalysis]: Checked inductivity of 6461 backedges. 3324 proven. 515 refuted. 0 times theorem prover too weak. 2622 trivial. 0 not checked. [2020-07-21 23:20:32,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:33,284 INFO L134 CoverageAnalysis]: Checked inductivity of 6461 backedges. 1560 proven. 1145 refuted. 0 times theorem prover too weak. 3756 trivial. 0 not checked. [2020-07-21 23:20:33,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762386495] [2020-07-21 23:20:33,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:33,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 25 [2020-07-21 23:20:33,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913714718] [2020-07-21 23:20:33,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 23:20:33,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:33,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 23:20:33,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=465, Unknown=0, NotChecked=0, Total=600 [2020-07-21 23:20:33,286 INFO L87 Difference]: Start difference. First operand 214 states and 269 transitions. Second operand 25 states. [2020-07-21 23:20:34,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:34,337 INFO L93 Difference]: Finished difference Result 327 states and 427 transitions. [2020-07-21 23:20:34,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 23:20:34,342 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 344 [2020-07-21 23:20:34,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:34,345 INFO L225 Difference]: With dead ends: 327 [2020-07-21 23:20:34,345 INFO L226 Difference]: Without dead ends: 262 [2020-07-21 23:20:34,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 710 GetRequests, 659 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=638, Invalid=1618, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 23:20:34,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-07-21 23:20:34,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 248. [2020-07-21 23:20:34,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-21 23:20:34,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 319 transitions. [2020-07-21 23:20:34,385 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 319 transitions. Word has length 344 [2020-07-21 23:20:34,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:34,386 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 319 transitions. [2020-07-21 23:20:34,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 23:20:34,386 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 319 transitions. [2020-07-21 23:20:34,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-21 23:20:34,389 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:34,389 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 43, 42, 42, 42, 42, 10, 9, 9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:34,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:34,603 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:34,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:34,603 INFO L82 PathProgramCache]: Analyzing trace with hash 930621925, now seen corresponding path program 20 times [2020-07-21 23:20:34,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:34,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659745485] [2020-07-21 23:20:34,604 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 [2020-07-21 23:20:34,714 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:34,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:34,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 23:20:34,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:35,288 INFO L134 CoverageAnalysis]: Checked inductivity of 6761 backedges. 770 proven. 2457 refuted. 0 times theorem prover too weak. 3534 trivial. 0 not checked. [2020-07-21 23:20:35,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:35,930 INFO L134 CoverageAnalysis]: Checked inductivity of 6761 backedges. 454 proven. 2457 refuted. 0 times theorem prover too weak. 3850 trivial. 0 not checked. [2020-07-21 23:20:35,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [659745485] [2020-07-21 23:20:35,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:35,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 31 [2020-07-21 23:20:35,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59921200] [2020-07-21 23:20:35,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 23:20:35,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:35,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 23:20:35,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=743, Unknown=0, NotChecked=0, Total=930 [2020-07-21 23:20:35,935 INFO L87 Difference]: Start difference. First operand 248 states and 319 transitions. Second operand 31 states. [2020-07-21 23:20:39,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:39,591 INFO L93 Difference]: Finished difference Result 462 states and 609 transitions. [2020-07-21 23:20:39,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2020-07-21 23:20:39,593 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 351 [2020-07-21 23:20:39,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:39,596 INFO L225 Difference]: With dead ends: 462 [2020-07-21 23:20:39,596 INFO L226 Difference]: Without dead ends: 333 [2020-07-21 23:20:39,599 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 770 GetRequests, 667 SyntacticMatches, 5 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3218 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2462, Invalid=7438, Unknown=0, NotChecked=0, Total=9900 [2020-07-21 23:20:39,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-21 23:20:39,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 274. [2020-07-21 23:20:39,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2020-07-21 23:20:39,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 355 transitions. [2020-07-21 23:20:39,640 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 355 transitions. Word has length 351 [2020-07-21 23:20:39,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:39,640 INFO L479 AbstractCegarLoop]: Abstraction has 274 states and 355 transitions. [2020-07-21 23:20:39,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 23:20:39,641 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 355 transitions. [2020-07-21 23:20:39,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 400 [2020-07-21 23:20:39,644 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:39,644 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 49, 48, 48, 48, 48, 11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:39,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:39,845 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:39,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:39,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1703194347, now seen corresponding path program 21 times [2020-07-21 23:20:39,846 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:39,847 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1822963729] [2020-07-21 23:20:39,847 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 [2020-07-21 23:20:39,967 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:39,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:39,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 23:20:39,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:40,371 INFO L134 CoverageAnalysis]: Checked inductivity of 8813 backedges. 4418 proven. 741 refuted. 0 times theorem prover too weak. 3654 trivial. 0 not checked. [2020-07-21 23:20:40,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:40,882 INFO L134 CoverageAnalysis]: Checked inductivity of 8813 backedges. 2002 proven. 1771 refuted. 0 times theorem prover too weak. 5040 trivial. 0 not checked. [2020-07-21 23:20:40,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1822963729] [2020-07-21 23:20:40,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:40,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 29 [2020-07-21 23:20:40,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959985401] [2020-07-21 23:20:40,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 23:20:40,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:40,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 23:20:40,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=635, Unknown=0, NotChecked=0, Total=812 [2020-07-21 23:20:40,885 INFO L87 Difference]: Start difference. First operand 274 states and 355 transitions. Second operand 29 states. [2020-07-21 23:20:42,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:42,300 INFO L93 Difference]: Finished difference Result 444 states and 593 transitions. [2020-07-21 23:20:42,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 23:20:42,301 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 399 [2020-07-21 23:20:42,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:42,304 INFO L225 Difference]: With dead ends: 444 [2020-07-21 23:20:42,304 INFO L226 Difference]: Without dead ends: 321 [2020-07-21 23:20:42,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 827 GetRequests, 765 SyntacticMatches, 5 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 704 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=969, Invalid=2453, Unknown=0, NotChecked=0, Total=3422 [2020-07-21 23:20:42,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-21 23:20:42,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 308. [2020-07-21 23:20:42,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 308 states. [2020-07-21 23:20:42,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 404 transitions. [2020-07-21 23:20:42,368 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 404 transitions. Word has length 399 [2020-07-21 23:20:42,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:42,369 INFO L479 AbstractCegarLoop]: Abstraction has 308 states and 404 transitions. [2020-07-21 23:20:42,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 23:20:42,369 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 404 transitions. [2020-07-21 23:20:42,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2020-07-21 23:20:42,372 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:42,373 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:42,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:42,586 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:42,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:42,587 INFO L82 PathProgramCache]: Analyzing trace with hash -1852909686, now seen corresponding path program 22 times [2020-07-21 23:20:42,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:42,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [745697639] [2020-07-21 23:20:42,588 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 23:20:42,713 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:42,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:42,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 729 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 23:20:42,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:43,011 INFO L134 CoverageAnalysis]: Checked inductivity of 9163 backedges. 1474 proven. 2579 refuted. 0 times theorem prover too weak. 5110 trivial. 0 not checked. [2020-07-21 23:20:43,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:43,422 INFO L134 CoverageAnalysis]: Checked inductivity of 9163 backedges. 762 proven. 2579 refuted. 0 times theorem prover too weak. 5822 trivial. 0 not checked. [2020-07-21 23:20:43,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [745697639] [2020-07-21 23:20:43,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:43,422 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 22 [2020-07-21 23:20:43,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229563059] [2020-07-21 23:20:43,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 23:20:43,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:43,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 23:20:43,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=353, Unknown=0, NotChecked=0, Total=462 [2020-07-21 23:20:43,424 INFO L87 Difference]: Start difference. First operand 308 states and 404 transitions. Second operand 22 states. [2020-07-21 23:20:45,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:45,476 INFO L93 Difference]: Finished difference Result 717 states and 960 transitions. [2020-07-21 23:20:45,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-21 23:20:45,477 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 406 [2020-07-21 23:20:45,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:45,480 INFO L225 Difference]: With dead ends: 717 [2020-07-21 23:20:45,480 INFO L226 Difference]: Without dead ends: 577 [2020-07-21 23:20:45,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 864 GetRequests, 785 SyntacticMatches, 6 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1840 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1240, Invalid=4310, Unknown=0, NotChecked=0, Total=5550 [2020-07-21 23:20:45,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2020-07-21 23:20:45,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 408. [2020-07-21 23:20:45,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-07-21 23:20:45,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 534 transitions. [2020-07-21 23:20:45,564 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 534 transitions. Word has length 406 [2020-07-21 23:20:45,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:45,565 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 534 transitions. [2020-07-21 23:20:45,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 23:20:45,565 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 534 transitions. [2020-07-21 23:20:45,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-07-21 23:20:45,570 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:45,570 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 54, 53, 53, 53, 53, 12, 11, 11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:45,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:45,784 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:45,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:45,785 INFO L82 PathProgramCache]: Analyzing trace with hash 1246863545, now seen corresponding path program 23 times [2020-07-21 23:20:45,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:45,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1403780330] [2020-07-21 23:20:45,785 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 [2020-07-21 23:20:45,951 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:45,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:45,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 783 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 23:20:45,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:46,205 INFO L134 CoverageAnalysis]: Checked inductivity of 10723 backedges. 4963 proven. 592 refuted. 0 times theorem prover too weak. 5168 trivial. 0 not checked. [2020-07-21 23:20:46,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:46,729 INFO L134 CoverageAnalysis]: Checked inductivity of 10723 backedges. 3382 proven. 607 refuted. 0 times theorem prover too weak. 6734 trivial. 0 not checked. [2020-07-21 23:20:46,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1403780330] [2020-07-21 23:20:46,730 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:46,730 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2020-07-21 23:20:46,731 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467116217] [2020-07-21 23:20:46,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 23:20:46,732 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:46,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 23:20:46,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=286, Unknown=0, NotChecked=0, Total=380 [2020-07-21 23:20:46,735 INFO L87 Difference]: Start difference. First operand 408 states and 534 transitions. Second operand 20 states. [2020-07-21 23:20:47,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:47,371 INFO L93 Difference]: Finished difference Result 557 states and 738 transitions. [2020-07-21 23:20:47,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 23:20:47,372 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 437 [2020-07-21 23:20:47,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:47,374 INFO L225 Difference]: With dead ends: 557 [2020-07-21 23:20:47,374 INFO L226 Difference]: Without dead ends: 327 [2020-07-21 23:20:47,375 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 885 GetRequests, 849 SyntacticMatches, 6 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2020-07-21 23:20:47,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2020-07-21 23:20:47,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 327. [2020-07-21 23:20:47,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2020-07-21 23:20:47,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 426 transitions. [2020-07-21 23:20:47,418 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 426 transitions. Word has length 437 [2020-07-21 23:20:47,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:47,419 INFO L479 AbstractCegarLoop]: Abstraction has 327 states and 426 transitions. [2020-07-21 23:20:47,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 23:20:47,419 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 426 transitions. [2020-07-21 23:20:47,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2020-07-21 23:20:47,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:47,422 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 55, 54, 54, 54, 54, 12, 11, 11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:47,636 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:47,637 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:47,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:47,638 INFO L82 PathProgramCache]: Analyzing trace with hash -833030556, now seen corresponding path program 24 times [2020-07-21 23:20:47,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:47,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [857065346] [2020-07-21 23:20:47,638 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 [2020-07-21 23:20:47,767 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:47,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:47,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 23:20:47,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:48,145 INFO L134 CoverageAnalysis]: Checked inductivity of 11109 backedges. 1311 proven. 3537 refuted. 0 times theorem prover too weak. 6261 trivial. 0 not checked. [2020-07-21 23:20:48,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:48,646 INFO L134 CoverageAnalysis]: Checked inductivity of 11109 backedges. 705 proven. 3537 refuted. 0 times theorem prover too weak. 6867 trivial. 0 not checked. [2020-07-21 23:20:48,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [857065346] [2020-07-21 23:20:48,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:48,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 26 [2020-07-21 23:20:48,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742464497] [2020-07-21 23:20:48,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 23:20:48,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:48,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 23:20:48,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2020-07-21 23:20:48,648 INFO L87 Difference]: Start difference. First operand 327 states and 426 transitions. Second operand 26 states. [2020-07-21 23:20:52,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:52,381 INFO L93 Difference]: Finished difference Result 554 states and 739 transitions. [2020-07-21 23:20:52,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2020-07-21 23:20:52,382 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 444 [2020-07-21 23:20:52,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:52,385 INFO L225 Difference]: With dead ends: 554 [2020-07-21 23:20:52,385 INFO L226 Difference]: Without dead ends: 404 [2020-07-21 23:20:52,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 966 GetRequests, 857 SyntacticMatches, 6 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3949 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2420, Invalid=8500, Unknown=0, NotChecked=0, Total=10920 [2020-07-21 23:20:52,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2020-07-21 23:20:52,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 348. [2020-07-21 23:20:52,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 23:20:52,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 454 transitions. [2020-07-21 23:20:52,455 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 454 transitions. Word has length 444 [2020-07-21 23:20:52,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:52,456 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 454 transitions. [2020-07-21 23:20:52,456 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 23:20:52,456 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 454 transitions. [2020-07-21 23:20:52,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 483 [2020-07-21 23:20:52,461 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:52,461 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 60, 59, 59, 59, 59, 13, 12, 12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:52,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:52,676 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:52,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:52,676 INFO L82 PathProgramCache]: Analyzing trace with hash 1802445246, now seen corresponding path program 25 times [2020-07-21 23:20:52,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:52,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [118845283] [2020-07-21 23:20:52,676 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 [2020-07-21 23:20:52,808 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:52,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:52,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 861 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 23:20:52,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:53,179 INFO L134 CoverageAnalysis]: Checked inductivity of 13243 backedges. 6103 proven. 821 refuted. 0 times theorem prover too weak. 6319 trivial. 0 not checked. [2020-07-21 23:20:53,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:53,722 INFO L134 CoverageAnalysis]: Checked inductivity of 13243 backedges. 3581 proven. 1561 refuted. 0 times theorem prover too weak. 8101 trivial. 0 not checked. [2020-07-21 23:20:53,723 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [118845283] [2020-07-21 23:20:53,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:53,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 24 [2020-07-21 23:20:53,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771044586] [2020-07-21 23:20:53,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 23:20:53,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:53,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 23:20:53,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=424, Unknown=0, NotChecked=0, Total=552 [2020-07-21 23:20:53,724 INFO L87 Difference]: Start difference. First operand 348 states and 454 transitions. Second operand 24 states. [2020-07-21 23:20:54,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:54,647 INFO L93 Difference]: Finished difference Result 481 states and 637 transitions. [2020-07-21 23:20:54,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 23:20:54,648 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 482 [2020-07-21 23:20:54,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:54,652 INFO L225 Difference]: With dead ends: 481 [2020-07-21 23:20:54,652 INFO L226 Difference]: Without dead ends: 348 [2020-07-21 23:20:54,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 983 GetRequests, 935 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=533, Invalid=1359, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 23:20:54,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2020-07-21 23:20:54,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 348. [2020-07-21 23:20:54,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 23:20:54,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 452 transitions. [2020-07-21 23:20:54,719 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 452 transitions. Word has length 482 [2020-07-21 23:20:54,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:54,720 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 452 transitions. [2020-07-21 23:20:54,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 23:20:54,720 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 452 transitions. [2020-07-21 23:20:54,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-21 23:20:54,724 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:54,725 INFO L422 BasicCegarLoop]: trace histogram [61, 61, 61, 60, 60, 60, 60, 13, 12, 12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:54,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:54,938 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:54,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:54,938 INFO L82 PathProgramCache]: Analyzing trace with hash 564016575, now seen corresponding path program 26 times [2020-07-21 23:20:54,939 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:54,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [189222104] [2020-07-21 23:20:54,939 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 [2020-07-21 23:20:55,092 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:55,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:55,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 23:20:55,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:55,591 INFO L134 CoverageAnalysis]: Checked inductivity of 13672 backedges. 1082 proven. 4783 refuted. 0 times theorem prover too weak. 7807 trivial. 0 not checked. [2020-07-21 23:20:55,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:56,259 INFO L134 CoverageAnalysis]: Checked inductivity of 13672 backedges. 622 proven. 4783 refuted. 0 times theorem prover too weak. 8267 trivial. 0 not checked. [2020-07-21 23:20:56,260 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [189222104] [2020-07-21 23:20:56,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:56,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 30 [2020-07-21 23:20:56,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573306067] [2020-07-21 23:20:56,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 23:20:56,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:56,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 23:20:56,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=691, Unknown=0, NotChecked=0, Total=870 [2020-07-21 23:20:56,262 INFO L87 Difference]: Start difference. First operand 348 states and 452 transitions. Second operand 30 states. [2020-07-21 23:21:01,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:01,252 INFO L93 Difference]: Finished difference Result 561 states and 744 transitions. [2020-07-21 23:21:01,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2020-07-21 23:21:01,253 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 489 [2020-07-21 23:21:01,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:01,256 INFO L225 Difference]: With dead ends: 561 [2020-07-21 23:21:01,257 INFO L226 Difference]: Without dead ends: 408 [2020-07-21 23:21:01,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1069 GetRequests, 943 SyntacticMatches, 6 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5393 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3316, Invalid=11446, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 23:21:01,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2020-07-21 23:21:01,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 372. [2020-07-21 23:21:01,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2020-07-21 23:21:01,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 484 transitions. [2020-07-21 23:21:01,332 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 484 transitions. Word has length 489 [2020-07-21 23:21:01,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:01,332 INFO L479 AbstractCegarLoop]: Abstraction has 372 states and 484 transitions. [2020-07-21 23:21:01,332 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 23:21:01,333 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 484 transitions. [2020-07-21 23:21:01,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 535 [2020-07-21 23:21:01,338 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:01,339 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 67, 66, 66, 66, 66, 14, 13, 13, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:01,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:01,554 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:01,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:01,555 INFO L82 PathProgramCache]: Analyzing trace with hash 869445188, now seen corresponding path program 27 times [2020-07-21 23:21:01,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:01,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1012340927] [2020-07-21 23:21:01,556 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 [2020-07-21 23:21:01,709 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:01,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:01,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 951 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 23:21:01,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:02,200 INFO L134 CoverageAnalysis]: Checked inductivity of 16502 backedges. 7544 proven. 1104 refuted. 0 times theorem prover too weak. 7854 trivial. 0 not checked. [2020-07-21 23:21:02,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:03,111 INFO L134 CoverageAnalysis]: Checked inductivity of 16502 backedges. 3915 proven. 2699 refuted. 0 times theorem prover too weak. 9888 trivial. 0 not checked. [2020-07-21 23:21:03,111 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1012340927] [2020-07-21 23:21:03,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:03,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 28 [2020-07-21 23:21:03,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374719496] [2020-07-21 23:21:03,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 23:21:03,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:03,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 23:21:03,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=588, Unknown=0, NotChecked=0, Total=756 [2020-07-21 23:21:03,115 INFO L87 Difference]: Start difference. First operand 372 states and 484 transitions. Second operand 28 states. [2020-07-21 23:21:04,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:04,656 INFO L93 Difference]: Finished difference Result 505 states and 666 transitions. [2020-07-21 23:21:04,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 23:21:04,657 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 534 [2020-07-21 23:21:04,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:04,661 INFO L225 Difference]: With dead ends: 505 [2020-07-21 23:21:04,661 INFO L226 Difference]: Without dead ends: 372 [2020-07-21 23:21:04,662 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1095 GetRequests, 1035 SyntacticMatches, 6 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=863, Invalid=2217, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 23:21:04,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2020-07-21 23:21:04,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 341. [2020-07-21 23:21:04,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2020-07-21 23:21:04,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 437 transitions. [2020-07-21 23:21:04,724 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 437 transitions. Word has length 534 [2020-07-21 23:21:04,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:04,725 INFO L479 AbstractCegarLoop]: Abstraction has 341 states and 437 transitions. [2020-07-21 23:21:04,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 23:21:04,725 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 437 transitions. [2020-07-21 23:21:04,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 542 [2020-07-21 23:21:04,730 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:04,730 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 68, 67, 67, 67, 67, 14, 13, 13, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:04,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:04,945 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:04,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:04,945 INFO L82 PathProgramCache]: Analyzing trace with hash 943892089, now seen corresponding path program 28 times [2020-07-21 23:21:04,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:04,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1871486082] [2020-07-21 23:21:04,945 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 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 [2020-07-21 23:21:05,094 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:05,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:05,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 23:21:05,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:05,779 INFO L134 CoverageAnalysis]: Checked inductivity of 16981 backedges. 766 proven. 6380 refuted. 0 times theorem prover too weak. 9835 trivial. 0 not checked. [2020-07-21 23:21:05,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:06,559 INFO L134 CoverageAnalysis]: Checked inductivity of 16981 backedges. 504 proven. 6380 refuted. 0 times theorem prover too weak. 10097 trivial. 0 not checked. [2020-07-21 23:21:06,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1871486082] [2020-07-21 23:21:06,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:06,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 34 [2020-07-21 23:21:06,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401915632] [2020-07-21 23:21:06,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 23:21:06,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:06,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 23:21:06,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 23:21:06,561 INFO L87 Difference]: Start difference. First operand 341 states and 437 transitions. Second operand 34 states. [2020-07-21 23:21:13,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:13,083 INFO L93 Difference]: Finished difference Result 529 states and 691 transitions. [2020-07-21 23:21:13,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2020-07-21 23:21:13,084 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 541 [2020-07-21 23:21:13,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:13,086 INFO L225 Difference]: With dead ends: 529 [2020-07-21 23:21:13,086 INFO L226 Difference]: Without dead ends: 404 [2020-07-21 23:21:13,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1182 GetRequests, 1043 SyntacticMatches, 6 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6579 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=3980, Invalid=14110, Unknown=0, NotChecked=0, Total=18090 [2020-07-21 23:21:13,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2020-07-21 23:21:13,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 368. [2020-07-21 23:21:13,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-21 23:21:13,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 473 transitions. [2020-07-21 23:21:13,161 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 473 transitions. Word has length 541 [2020-07-21 23:21:13,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:13,162 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 473 transitions. [2020-07-21 23:21:13,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 23:21:13,163 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 473 transitions. [2020-07-21 23:21:13,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 594 [2020-07-21 23:21:13,169 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:13,170 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 75, 74, 74, 74, 74, 15, 14, 14, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:13,383 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:13,384 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:13,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:13,384 INFO L82 PathProgramCache]: Analyzing trace with hash 1328811571, now seen corresponding path program 29 times [2020-07-21 23:21:13,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:13,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [815573745] [2020-07-21 23:21:13,385 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 [2020-07-21 23:21:13,567 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:13,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:13,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 1053 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 23:21:13,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:14,211 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 9340 proven. 1450 refuted. 0 times theorem prover too weak. 9860 trivial. 0 not checked. [2020-07-21 23:21:14,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:15,136 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 4438 proven. 4030 refuted. 0 times theorem prover too weak. 12182 trivial. 0 not checked. [2020-07-21 23:21:15,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [815573745] [2020-07-21 23:21:15,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:15,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 32 [2020-07-21 23:21:15,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84513934] [2020-07-21 23:21:15,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 23:21:15,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:15,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 23:21:15,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=778, Unknown=0, NotChecked=0, Total=992 [2020-07-21 23:21:15,139 INFO L87 Difference]: Start difference. First operand 368 states and 473 transitions. Second operand 32 states. [2020-07-21 23:21:17,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:17,064 INFO L93 Difference]: Finished difference Result 512 states and 672 transitions. [2020-07-21 23:21:17,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-07-21 23:21:17,070 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 593 [2020-07-21 23:21:17,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:17,073 INFO L225 Difference]: With dead ends: 512 [2020-07-21 23:21:17,073 INFO L226 Difference]: Without dead ends: 410 [2020-07-21 23:21:17,074 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1221 GetRequests, 1149 SyntacticMatches, 6 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 974 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1270, Invalid=3286, Unknown=0, NotChecked=0, Total=4556 [2020-07-21 23:21:17,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2020-07-21 23:21:17,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 402. [2020-07-21 23:21:17,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 402 states. [2020-07-21 23:21:17,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 521 transitions. [2020-07-21 23:21:17,137 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 521 transitions. Word has length 593 [2020-07-21 23:21:17,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:17,138 INFO L479 AbstractCegarLoop]: Abstraction has 402 states and 521 transitions. [2020-07-21 23:21:17,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 23:21:17,138 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 521 transitions. [2020-07-21 23:21:17,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 601 [2020-07-21 23:21:17,143 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:17,143 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 76, 75, 75, 75, 75, 15, 14, 14, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:17,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:17,357 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:17,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:17,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1218530218, now seen corresponding path program 30 times [2020-07-21 23:21:17,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:17,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1019614830] [2020-07-21 23:21:17,359 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 23:21:17,519 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:17,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:17,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 1065 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 23:21:17,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:18,290 INFO L134 CoverageAnalysis]: Checked inductivity of 21186 backedges. 342 proven. 8400 refuted. 0 times theorem prover too weak. 12444 trivial. 0 not checked. [2020-07-21 23:21:18,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:19,278 INFO L134 CoverageAnalysis]: Checked inductivity of 21186 backedges. 342 proven. 8400 refuted. 0 times theorem prover too weak. 12444 trivial. 0 not checked. [2020-07-21 23:21:19,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1019614830] [2020-07-21 23:21:19,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:19,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 38 [2020-07-21 23:21:19,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304739038] [2020-07-21 23:21:19,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 23:21:19,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:19,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 23:21:19,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=1133, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 23:21:19,280 INFO L87 Difference]: Start difference. First operand 402 states and 521 transitions. Second operand 38 states. [2020-07-21 23:21:27,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:27,273 INFO L93 Difference]: Finished difference Result 711 states and 940 transitions. [2020-07-21 23:21:27,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2020-07-21 23:21:27,275 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 600 [2020-07-21 23:21:27,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:27,278 INFO L225 Difference]: With dead ends: 711 [2020-07-21 23:21:27,278 INFO L226 Difference]: Without dead ends: 529 [2020-07-21 23:21:27,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1313 GetRequests, 1157 SyntacticMatches, 6 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8485 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=5519, Invalid=17433, Unknown=0, NotChecked=0, Total=22952 [2020-07-21 23:21:27,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2020-07-21 23:21:27,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 434. [2020-07-21 23:21:27,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 434 states. [2020-07-21 23:21:27,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 565 transitions. [2020-07-21 23:21:27,389 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 565 transitions. Word has length 600 [2020-07-21 23:21:27,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:27,390 INFO L479 AbstractCegarLoop]: Abstraction has 434 states and 565 transitions. [2020-07-21 23:21:27,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 23:21:27,391 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 565 transitions. [2020-07-21 23:21:27,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 663 [2020-07-21 23:21:27,398 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:27,398 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 84, 83, 83, 83, 83, 16, 15, 15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:27,611 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:27,612 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:27,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:27,612 INFO L82 PathProgramCache]: Analyzing trace with hash -955730672, now seen corresponding path program 31 times [2020-07-21 23:21:27,612 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:27,612 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [57120644] [2020-07-21 23:21:27,613 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 [2020-07-21 23:21:27,789 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:27,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:27,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 23:21:27,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:29,296 INFO L134 CoverageAnalysis]: Checked inductivity of 25890 backedges. 11585 proven. 1868 refuted. 0 times theorem prover too weak. 12437 trivial. 0 not checked. [2020-07-21 23:21:29,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:30,518 INFO L134 CoverageAnalysis]: Checked inductivity of 25890 backedges. 5244 proven. 5563 refuted. 0 times theorem prover too weak. 15083 trivial. 0 not checked. [2020-07-21 23:21:30,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [57120644] [2020-07-21 23:21:30,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:30,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 36 [2020-07-21 23:21:30,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956453554] [2020-07-21 23:21:30,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 23:21:30,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:30,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 23:21:30,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=994, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 23:21:30,521 INFO L87 Difference]: Start difference. First operand 434 states and 565 transitions. Second operand 36 states. [2020-07-21 23:21:33,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:33,620 INFO L93 Difference]: Finished difference Result 642 states and 851 transitions. [2020-07-21 23:21:33,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-07-21 23:21:33,621 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 662 [2020-07-21 23:21:33,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:33,625 INFO L225 Difference]: With dead ends: 642 [2020-07-21 23:21:33,626 INFO L226 Difference]: Without dead ends: 476 [2020-07-21 23:21:33,628 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1368 GetRequests, 1283 SyntacticMatches, 6 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1415 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1819, Invalid=4661, Unknown=0, NotChecked=0, Total=6480 [2020-07-21 23:21:33,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2020-07-21 23:21:33,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 468. [2020-07-21 23:21:33,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 468 states. [2020-07-21 23:21:33,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 612 transitions. [2020-07-21 23:21:33,698 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 612 transitions. Word has length 662 [2020-07-21 23:21:33,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:33,699 INFO L479 AbstractCegarLoop]: Abstraction has 468 states and 612 transitions. [2020-07-21 23:21:33,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 23:21:33,699 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 612 transitions. [2020-07-21 23:21:33,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 670 [2020-07-21 23:21:33,705 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:33,705 INFO L422 BasicCegarLoop]: trace histogram [85, 85, 85, 84, 84, 84, 84, 16, 15, 15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:33,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:33,920 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:33,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:33,920 INFO L82 PathProgramCache]: Analyzing trace with hash 2116259269, now seen corresponding path program 32 times [2020-07-21 23:21:33,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:33,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [360103387] [2020-07-21 23:21:33,921 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 [2020-07-21 23:21:34,113 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:34,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:34,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 1185 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 23:21:34,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:34,703 INFO L134 CoverageAnalysis]: Checked inductivity of 26490 backedges. 2043 proven. 8366 refuted. 0 times theorem prover too weak. 16081 trivial. 0 not checked. [2020-07-21 23:21:34,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:35,609 INFO L134 CoverageAnalysis]: Checked inductivity of 26490 backedges. 1077 proven. 8366 refuted. 0 times theorem prover too weak. 17047 trivial. 0 not checked. [2020-07-21 23:21:35,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [360103387] [2020-07-21 23:21:35,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:35,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 25 [2020-07-21 23:21:35,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301439108] [2020-07-21 23:21:35,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 23:21:35,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:35,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 23:21:35,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=460, Unknown=0, NotChecked=0, Total=600 [2020-07-21 23:21:35,612 INFO L87 Difference]: Start difference. First operand 468 states and 612 transitions. Second operand 25 states. [2020-07-21 23:21:39,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:39,436 INFO L93 Difference]: Finished difference Result 1038 states and 1381 transitions. [2020-07-21 23:21:39,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2020-07-21 23:21:39,437 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 669 [2020-07-21 23:21:39,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:39,442 INFO L225 Difference]: With dead ends: 1038 [2020-07-21 23:21:39,442 INFO L226 Difference]: Without dead ends: 861 [2020-07-21 23:21:39,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1409 GetRequests, 1307 SyntacticMatches, 7 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3368 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2002, Invalid=7310, Unknown=0, NotChecked=0, Total=9312 [2020-07-21 23:21:39,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 861 states. [2020-07-21 23:21:39,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 861 to 613. [2020-07-21 23:21:39,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 613 states. [2020-07-21 23:21:39,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 613 states to 613 states and 801 transitions. [2020-07-21 23:21:39,556 INFO L78 Accepts]: Start accepts. Automaton has 613 states and 801 transitions. Word has length 669 [2020-07-21 23:21:39,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:39,557 INFO L479 AbstractCegarLoop]: Abstraction has 613 states and 801 transitions. [2020-07-21 23:21:39,557 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 23:21:39,557 INFO L276 IsEmpty]: Start isEmpty. Operand 613 states and 801 transitions. [2020-07-21 23:21:39,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 708 [2020-07-21 23:21:39,564 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:39,565 INFO L422 BasicCegarLoop]: trace histogram [90, 90, 90, 89, 89, 89, 89, 17, 16, 16, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:39,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:39,772 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:39,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:39,773 INFO L82 PathProgramCache]: Analyzing trace with hash -1360123809, now seen corresponding path program 33 times [2020-07-21 23:21:39,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:39,774 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [46081104] [2020-07-21 23:21:39,774 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 [2020-07-21 23:21:39,964 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:39,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:39,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 1251 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 23:21:39,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:40,518 INFO L134 CoverageAnalysis]: Checked inductivity of 29737 backedges. 12393 proven. 1325 refuted. 0 times theorem prover too weak. 16019 trivial. 0 not checked. [2020-07-21 23:21:40,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:41,532 INFO L134 CoverageAnalysis]: Checked inductivity of 29737 backedges. 9510 proven. 1346 refuted. 0 times theorem prover too weak. 18881 trivial. 0 not checked. [2020-07-21 23:21:41,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [46081104] [2020-07-21 23:21:41,532 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:41,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 23 [2020-07-21 23:21:41,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147451911] [2020-07-21 23:21:41,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 23:21:41,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:41,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 23:21:41,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=383, Unknown=0, NotChecked=0, Total=506 [2020-07-21 23:21:41,535 INFO L87 Difference]: Start difference. First operand 613 states and 801 transitions. Second operand 23 states. [2020-07-21 23:21:42,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:42,596 INFO L93 Difference]: Finished difference Result 802 states and 1058 transitions. [2020-07-21 23:21:42,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 23:21:42,597 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 707 [2020-07-21 23:21:42,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:42,599 INFO L225 Difference]: With dead ends: 802 [2020-07-21 23:21:42,600 INFO L226 Difference]: Without dead ends: 490 [2020-07-21 23:21:42,601 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1428 GetRequests, 1385 SyntacticMatches, 7 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=395, Invalid=1011, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 23:21:42,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-21 23:21:42,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 490. [2020-07-21 23:21:42,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2020-07-21 23:21:42,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 638 transitions. [2020-07-21 23:21:42,688 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 638 transitions. Word has length 707 [2020-07-21 23:21:42,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:42,689 INFO L479 AbstractCegarLoop]: Abstraction has 490 states and 638 transitions. [2020-07-21 23:21:42,689 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 23:21:42,689 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 638 transitions. [2020-07-21 23:21:42,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 715 [2020-07-21 23:21:42,694 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:42,694 INFO L422 BasicCegarLoop]: trace histogram [91, 91, 91, 90, 90, 90, 90, 17, 16, 16, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:42,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:42,895 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:42,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:42,896 INFO L82 PathProgramCache]: Analyzing trace with hash 1558816766, now seen corresponding path program 34 times [2020-07-21 23:21:42,896 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:42,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [773447958] [2020-07-21 23:21:42,897 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 [2020-07-21 23:21:43,087 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:43,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:43,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 1263 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 23:21:43,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:43,780 INFO L134 CoverageAnalysis]: Checked inductivity of 30380 backedges. 1600 proven. 10313 refuted. 0 times theorem prover too weak. 18467 trivial. 0 not checked. [2020-07-21 23:21:43,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:44,868 INFO L134 CoverageAnalysis]: Checked inductivity of 30380 backedges. 900 proven. 10313 refuted. 0 times theorem prover too weak. 19167 trivial. 0 not checked. [2020-07-21 23:21:44,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [773447958] [2020-07-21 23:21:44,868 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:44,868 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 29 [2020-07-21 23:21:44,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420547755] [2020-07-21 23:21:44,869 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 23:21:44,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:44,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 23:21:44,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=637, Unknown=0, NotChecked=0, Total=812 [2020-07-21 23:21:44,870 INFO L87 Difference]: Start difference. First operand 490 states and 638 transitions. Second operand 29 states. [2020-07-21 23:21:52,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:52,426 INFO L93 Difference]: Finished difference Result 794 states and 1055 transitions. [2020-07-21 23:21:52,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2020-07-21 23:21:52,428 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 714 [2020-07-21 23:21:52,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:52,431 INFO L225 Difference]: With dead ends: 794 [2020-07-21 23:21:52,431 INFO L226 Difference]: Without dead ends: 607 [2020-07-21 23:21:52,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1540 GetRequests, 1393 SyntacticMatches, 7 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8078 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=4264, Invalid=15758, Unknown=0, NotChecked=0, Total=20022 [2020-07-21 23:21:52,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2020-07-21 23:21:52,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 514. [2020-07-21 23:21:52,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-21 23:21:52,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 670 transitions. [2020-07-21 23:21:52,513 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 670 transitions. Word has length 714 [2020-07-21 23:21:52,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:52,514 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 670 transitions. [2020-07-21 23:21:52,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 23:21:52,515 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 670 transitions. [2020-07-21 23:21:52,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 760 [2020-07-21 23:21:52,522 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:52,522 INFO L422 BasicCegarLoop]: trace histogram [97, 97, 97, 96, 96, 96, 96, 18, 17, 17, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:52,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:52,734 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:52,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:52,735 INFO L82 PathProgramCache]: Analyzing trace with hash 937711205, now seen corresponding path program 35 times [2020-07-21 23:21:52,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:52,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [759219635] [2020-07-21 23:21:52,735 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 [2020-07-21 23:21:52,937 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:52,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:52,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 1341 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 23:21:52,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:53,776 INFO L134 CoverageAnalysis]: Checked inductivity of 34537 backedges. 14441 proven. 1702 refuted. 0 times theorem prover too weak. 18394 trivial. 0 not checked. [2020-07-21 23:21:53,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:55,009 INFO L134 CoverageAnalysis]: Checked inductivity of 34537 backedges. 9740 proven. 3289 refuted. 0 times theorem prover too weak. 21508 trivial. 0 not checked. [2020-07-21 23:21:55,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [759219635] [2020-07-21 23:21:55,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:55,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 27 [2020-07-21 23:21:55,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125564613] [2020-07-21 23:21:55,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 23:21:55,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:55,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 23:21:55,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=541, Unknown=0, NotChecked=0, Total=702 [2020-07-21 23:21:55,012 INFO L87 Difference]: Start difference. First operand 514 states and 670 transitions. Second operand 27 states. [2020-07-21 23:21:56,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:56,838 INFO L93 Difference]: Finished difference Result 684 states and 902 transitions. [2020-07-21 23:21:56,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 23:21:56,839 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 759 [2020-07-21 23:21:56,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:56,842 INFO L225 Difference]: With dead ends: 684 [2020-07-21 23:21:56,842 INFO L226 Difference]: Without dead ends: 514 [2020-07-21 23:21:56,843 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1541 GetRequests, 1485 SyntacticMatches, 7 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 486 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=713, Invalid=1837, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 23:21:56,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-21 23:21:56,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 514. [2020-07-21 23:21:56,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-21 23:21:56,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 668 transitions. [2020-07-21 23:21:56,936 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 668 transitions. Word has length 759 [2020-07-21 23:21:56,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:56,936 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 668 transitions. [2020-07-21 23:21:56,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 23:21:56,936 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 668 transitions. [2020-07-21 23:21:56,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 767 [2020-07-21 23:21:56,941 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:56,942 INFO L422 BasicCegarLoop]: trace histogram [98, 98, 98, 97, 97, 97, 97, 18, 17, 17, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:57,147 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:57,148 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:57,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:57,149 INFO L82 PathProgramCache]: Analyzing trace with hash -661993672, now seen corresponding path program 36 times [2020-07-21 23:21:57,149 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:57,149 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1218955909] [2020-07-21 23:21:57,150 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 [2020-07-21 23:21:57,347 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:57,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:57,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 1353 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 23:21:57,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:58,229 INFO L134 CoverageAnalysis]: Checked inductivity of 35230 backedges. 1070 proven. 12705 refuted. 0 times theorem prover too weak. 21455 trivial. 0 not checked. [2020-07-21 23:21:58,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:59,602 INFO L134 CoverageAnalysis]: Checked inductivity of 35230 backedges. 688 proven. 12705 refuted. 0 times theorem prover too weak. 21837 trivial. 0 not checked. [2020-07-21 23:21:59,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1218955909] [2020-07-21 23:21:59,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:59,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 33 [2020-07-21 23:21:59,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974994973] [2020-07-21 23:21:59,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 23:21:59,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:59,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 23:21:59,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=840, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 23:21:59,604 INFO L87 Difference]: Start difference. First operand 514 states and 668 transitions. Second operand 33 states. [2020-07-21 23:22:11,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:22:11,031 INFO L93 Difference]: Finished difference Result 793 states and 1047 transitions. [2020-07-21 23:22:11,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2020-07-21 23:22:11,034 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 766 [2020-07-21 23:22:11,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:22:11,039 INFO L225 Difference]: With dead ends: 793 [2020-07-21 23:22:11,039 INFO L226 Difference]: Without dead ends: 603 [2020-07-21 23:22:11,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1662 GetRequests, 1493 SyntacticMatches, 7 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10746 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=5648, Invalid=21084, Unknown=0, NotChecked=0, Total=26732 [2020-07-21 23:22:11,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 603 states. [2020-07-21 23:22:11,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 603 to 541. [2020-07-21 23:22:11,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-21 23:22:11,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 704 transitions. [2020-07-21 23:22:11,168 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 704 transitions. Word has length 766 [2020-07-21 23:22:11,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:22:11,169 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 704 transitions. [2020-07-21 23:22:11,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 23:22:11,169 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 704 transitions. [2020-07-21 23:22:11,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 819 [2020-07-21 23:22:11,175 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:22:11,175 INFO L422 BasicCegarLoop]: trace histogram [105, 105, 105, 104, 104, 104, 104, 19, 18, 18, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:22:11,381 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:22:11,382 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:22:11,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:22:11,383 INFO L82 PathProgramCache]: Analyzing trace with hash -1871274638, now seen corresponding path program 37 times [2020-07-21 23:22:11,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:22:11,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1383095892] [2020-07-21 23:22:11,384 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 [2020-07-21 23:22:11,602 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:22:11,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:22:11,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 1443 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 23:22:11,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:22:12,588 INFO L134 CoverageAnalysis]: Checked inductivity of 40440 backedges. 16938 proven. 2142 refuted. 0 times theorem prover too weak. 21360 trivial. 0 not checked. [2020-07-21 23:22:12,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:22:14,075 INFO L134 CoverageAnalysis]: Checked inductivity of 40440 backedges. 10143 proven. 5535 refuted. 0 times theorem prover too weak. 24762 trivial. 0 not checked. [2020-07-21 23:22:14,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1383095892] [2020-07-21 23:22:14,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:22:14,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 31 [2020-07-21 23:22:14,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980834902] [2020-07-21 23:22:14,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 23:22:14,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:22:14,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 23:22:14,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=725, Unknown=0, NotChecked=0, Total=930 [2020-07-21 23:22:14,078 INFO L87 Difference]: Start difference. First operand 541 states and 704 transitions. Second operand 31 states. [2020-07-21 23:22:16,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:22:16,755 INFO L93 Difference]: Finished difference Result 711 states and 935 transitions. [2020-07-21 23:22:16,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 23:22:16,758 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 818 [2020-07-21 23:22:16,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:22:16,762 INFO L225 Difference]: With dead ends: 711 [2020-07-21 23:22:16,762 INFO L226 Difference]: Without dead ends: 541 [2020-07-21 23:22:16,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1668 GetRequests, 1599 SyntacticMatches, 7 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 841 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1113, Invalid=2919, Unknown=0, NotChecked=0, Total=4032 [2020-07-21 23:22:16,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2020-07-21 23:22:16,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 541. [2020-07-21 23:22:16,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-21 23:22:16,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 702 transitions. [2020-07-21 23:22:16,872 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 702 transitions. Word has length 818 [2020-07-21 23:22:16,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:22:16,872 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 702 transitions. [2020-07-21 23:22:16,873 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 23:22:16,873 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 702 transitions. [2020-07-21 23:22:16,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 826 [2020-07-21 23:22:16,893 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:22:16,894 INFO L422 BasicCegarLoop]: trace histogram [106, 106, 106, 105, 105, 105, 105, 19, 18, 18, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:22:17,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:22:17,095 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:22:17,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:22:17,096 INFO L82 PathProgramCache]: Analyzing trace with hash -778442869, now seen corresponding path program 38 times [2020-07-21 23:22:17,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:22:17,097 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1802284397] [2020-07-21 23:22:17,097 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 [2020-07-21 23:22:17,314 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:22:17,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:22:17,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 1455 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 23:22:17,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:22:18,427 INFO L134 CoverageAnalysis]: Checked inductivity of 41190 backedges. 432 proven. 15614 refuted. 0 times theorem prover too weak. 25144 trivial. 0 not checked. [2020-07-21 23:22:18,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:22:20,249 INFO L134 CoverageAnalysis]: Checked inductivity of 41190 backedges. 432 proven. 15614 refuted. 0 times theorem prover too weak. 25144 trivial. 0 not checked. [2020-07-21 23:22:20,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1802284397] [2020-07-21 23:22:20,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:22:20,250 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 37 [2020-07-21 23:22:20,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12536771] [2020-07-21 23:22:20,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-21 23:22:20,251 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:22:20,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-21 23:22:20,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1069, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 23:22:20,251 INFO L87 Difference]: Start difference. First operand 541 states and 702 transitions. Second operand 37 states. [2020-07-21 23:22:37,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:22:37,662 INFO L93 Difference]: Finished difference Result 800 states and 1052 transitions. [2020-07-21 23:22:37,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2020-07-21 23:22:37,665 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 825 [2020-07-21 23:22:37,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:22:37,669 INFO L225 Difference]: With dead ends: 800 [2020-07-21 23:22:37,670 INFO L226 Difference]: Without dead ends: 607 [2020-07-21 23:22:37,674 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1800 GetRequests, 1607 SyntacticMatches, 7 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14327 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=7368, Invalid=27788, Unknown=0, NotChecked=0, Total=35156 [2020-07-21 23:22:37,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2020-07-21 23:22:37,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 571. [2020-07-21 23:22:37,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 571 states. [2020-07-21 23:22:37,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 571 states to 571 states and 742 transitions. [2020-07-21 23:22:37,769 INFO L78 Accepts]: Start accepts. Automaton has 571 states and 742 transitions. Word has length 825 [2020-07-21 23:22:37,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:22:37,770 INFO L479 AbstractCegarLoop]: Abstraction has 571 states and 742 transitions. [2020-07-21 23:22:37,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-21 23:22:37,770 INFO L276 IsEmpty]: Start isEmpty. Operand 571 states and 742 transitions. [2020-07-21 23:22:37,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 885 [2020-07-21 23:22:37,776 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:22:37,777 INFO L422 BasicCegarLoop]: trace histogram [114, 114, 114, 113, 113, 113, 113, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:22:37,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:22:37,978 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:22:37,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:22:37,978 INFO L82 PathProgramCache]: Analyzing trace with hash -1882081448, now seen corresponding path program 39 times [2020-07-21 23:22:37,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:22:37,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [220542480] [2020-07-21 23:22:37,979 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 [2020-07-21 23:22:38,229 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:22:38,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:22:38,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 1557 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 23:22:38,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:22:39,498 INFO L134 CoverageAnalysis]: Checked inductivity of 47617 backedges. 19947 proven. 2654 refuted. 0 times theorem prover too weak. 25016 trivial. 0 not checked. [2020-07-21 23:22:39,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:22:41,777 INFO L134 CoverageAnalysis]: Checked inductivity of 47617 backedges. 10782 proven. 8093 refuted. 0 times theorem prover too weak. 28742 trivial. 0 not checked. [2020-07-21 23:22:41,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [220542480] [2020-07-21 23:22:41,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:22:41,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2020-07-21 23:22:41,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156311767] [2020-07-21 23:22:41,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 23:22:41,779 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:22:41,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 23:22:41,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=935, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 23:22:41,780 INFO L87 Difference]: Start difference. First operand 571 states and 742 transitions. Second operand 35 states. [2020-07-21 23:22:46,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:22:46,215 INFO L93 Difference]: Finished difference Result 742 states and 973 transitions. [2020-07-21 23:22:46,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 23:22:46,218 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 884 [2020-07-21 23:22:46,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:22:46,222 INFO L225 Difference]: With dead ends: 742 [2020-07-21 23:22:46,223 INFO L226 Difference]: Without dead ends: 572 [2020-07-21 23:22:46,224 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1809 GetRequests, 1727 SyntacticMatches, 7 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1265 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1621, Invalid=4231, Unknown=0, NotChecked=0, Total=5852 [2020-07-21 23:22:46,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2020-07-21 23:22:46,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 540. [2020-07-21 23:22:46,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 540 states. [2020-07-21 23:22:46,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 540 states to 540 states and 697 transitions. [2020-07-21 23:22:46,346 INFO L78 Accepts]: Start accepts. Automaton has 540 states and 697 transitions. Word has length 884 [2020-07-21 23:22:46,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:22:46,347 INFO L479 AbstractCegarLoop]: Abstraction has 540 states and 697 transitions. [2020-07-21 23:22:46,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 23:22:46,347 INFO L276 IsEmpty]: Start isEmpty. Operand 540 states and 697 transitions. [2020-07-21 23:22:46,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 892 [2020-07-21 23:22:46,356 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:22:46,357 INFO L422 BasicCegarLoop]: trace histogram [115, 115, 115, 114, 114, 114, 114, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:22:46,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:22:46,571 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:22:46,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:22:46,572 INFO L82 PathProgramCache]: Analyzing trace with hash 932118245, now seen corresponding path program 40 times [2020-07-21 23:22:46,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:22:46,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [265829052] [2020-07-21 23:22:46,573 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 [2020-07-21 23:22:46,965 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:22:46,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:22:46,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 1569 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 23:22:46,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:22:48,081 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:22:48,084 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:22:49,620 INFO L134 CoverageAnalysis]: Checked inductivity of 48431 backedges. 18003 proven. 126 refuted. 0 times theorem prover too weak. 30302 trivial. 0 not checked. [2020-07-21 23:22:49,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:22:49,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:22:52,545 INFO L134 CoverageAnalysis]: Checked inductivity of 48431 backedges. 7043 proven. 11086 refuted. 0 times theorem prover too weak. 30302 trivial. 0 not checked. [2020-07-21 23:22:52,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [265829052] [2020-07-21 23:22:52,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:22:52,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2020-07-21 23:22:52,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419671226] [2020-07-21 23:22:52,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 23:22:52,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:22:52,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 23:22:52,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=787, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 23:22:52,549 INFO L87 Difference]: Start difference. First operand 540 states and 697 transitions. Second operand 35 states. [2020-07-21 23:22:56,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:22:56,460 INFO L93 Difference]: Finished difference Result 695 states and 917 transitions. [2020-07-21 23:22:56,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-07-21 23:22:56,462 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 891 [2020-07-21 23:22:56,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:22:56,468 INFO L225 Difference]: With dead ends: 695 [2020-07-21 23:22:56,468 INFO L226 Difference]: Without dead ends: 693 [2020-07-21 23:22:56,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1821 GetRequests, 1741 SyntacticMatches, 7 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1731 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1898, Invalid=3652, Unknown=0, NotChecked=0, Total=5550 [2020-07-21 23:22:56,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 693 states. [2020-07-21 23:22:56,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 693 to 610. [2020-07-21 23:22:56,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 610 states. [2020-07-21 23:22:56,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 610 states to 610 states and 799 transitions. [2020-07-21 23:22:56,567 INFO L78 Accepts]: Start accepts. Automaton has 610 states and 799 transitions. Word has length 891 [2020-07-21 23:22:56,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:22:56,568 INFO L479 AbstractCegarLoop]: Abstraction has 610 states and 799 transitions. [2020-07-21 23:22:56,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 23:22:56,569 INFO L276 IsEmpty]: Start isEmpty. Operand 610 states and 799 transitions. [2020-07-21 23:22:56,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 934 [2020-07-21 23:22:56,576 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:22:56,577 INFO L422 BasicCegarLoop]: trace histogram [121, 121, 121, 120, 120, 120, 120, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:22:56,777 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:22:56,778 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:22:56,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:22:56,779 INFO L82 PathProgramCache]: Analyzing trace with hash -1311394747, now seen corresponding path program 41 times [2020-07-21 23:22:56,779 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:22:56,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [416556371] [2020-07-21 23:22:56,780 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 [2020-07-21 23:22:57,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:22:57,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:22:57,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 1641 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 23:22:57,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:22:58,669 INFO L134 CoverageAnalysis]: Checked inductivity of 53462 backedges. 4615 proven. 19121 refuted. 0 times theorem prover too weak. 29726 trivial. 0 not checked. [2020-07-21 23:22:58,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:23:01,054 INFO L134 CoverageAnalysis]: Checked inductivity of 53462 backedges. 2325 proven. 19121 refuted. 0 times theorem prover too weak. 32016 trivial. 0 not checked. [2020-07-21 23:23:01,054 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [416556371] [2020-07-21 23:23:01,054 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:23:01,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 41 [2020-07-21 23:23:01,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813413965] [2020-07-21 23:23:01,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-21 23:23:01,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:23:01,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-21 23:23:01,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=1324, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 23:23:01,056 INFO L87 Difference]: Start difference. First operand 610 states and 799 transitions. Second operand 41 states. [2020-07-21 23:23:23,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:23:23,201 INFO L93 Difference]: Finished difference Result 920 states and 1236 transitions. [2020-07-21 23:23:23,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 166 states. [2020-07-21 23:23:23,203 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 933 [2020-07-21 23:23:23,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:23:23,208 INFO L225 Difference]: With dead ends: 920 [2020-07-21 23:23:23,208 INFO L226 Difference]: Without dead ends: 697 [2020-07-21 23:23:23,210 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2024 GetRequests, 1819 SyntacticMatches, 7 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16140 ImplicationChecksByTransitivity, 18.2s TimeCoverageRelationStatistics Valid=8499, Invalid=31301, Unknown=0, NotChecked=0, Total=39800 [2020-07-21 23:23:23,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2020-07-21 23:23:23,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 643. [2020-07-21 23:23:23,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 643 states. [2020-07-21 23:23:23,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 643 states to 643 states and 843 transitions. [2020-07-21 23:23:23,371 INFO L78 Accepts]: Start accepts. Automaton has 643 states and 843 transitions. Word has length 933 [2020-07-21 23:23:23,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:23:23,373 INFO L479 AbstractCegarLoop]: Abstraction has 643 states and 843 transitions. [2020-07-21 23:23:23,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-21 23:23:23,373 INFO L276 IsEmpty]: Start isEmpty. Operand 643 states and 843 transitions. [2020-07-21 23:23:23,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1000 [2020-07-21 23:23:23,389 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:23:23,390 INFO L422 BasicCegarLoop]: trace histogram [130, 130, 130, 129, 129, 129, 129, 21, 20, 20, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:23:23,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:23:23,603 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:23:23,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:23:23,604 INFO L82 PathProgramCache]: Analyzing trace with hash -874980193, now seen corresponding path program 42 times [2020-07-21 23:23:23,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:23:23,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [646121307] [2020-07-21 23:23:23,605 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 [2020-07-21 23:23:23,874 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:23:23,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:23:23,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 1755 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 23:23:23,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:23:25,527 INFO L134 CoverageAnalysis]: Checked inductivity of 61675 backedges. 28448 proven. 3247 refuted. 0 times theorem prover too weak. 29980 trivial. 0 not checked. [2020-07-21 23:23:25,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:23:28,596 INFO L134 CoverageAnalysis]: Checked inductivity of 61675 backedges. 13913 proven. 10972 refuted. 0 times theorem prover too weak. 36790 trivial. 0 not checked. [2020-07-21 23:23:28,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [646121307] [2020-07-21 23:23:28,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:23:28,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 39 [2020-07-21 23:23:28,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349141979] [2020-07-21 23:23:28,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-21 23:23:28,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:23:28,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-21 23:23:28,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1171, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 23:23:28,599 INFO L87 Difference]: Start difference. First operand 643 states and 843 transitions. Second operand 39 states. [2020-07-21 23:23:34,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:23:34,467 INFO L93 Difference]: Finished difference Result 912 states and 1233 transitions. [2020-07-21 23:23:34,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2020-07-21 23:23:34,469 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 999 [2020-07-21 23:23:34,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:23:34,473 INFO L225 Difference]: With dead ends: 912 [2020-07-21 23:23:34,474 INFO L226 Difference]: Without dead ends: 715 [2020-07-21 23:23:34,475 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2049 GetRequests, 1953 SyntacticMatches, 7 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1842 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=2273, Invalid=5917, Unknown=0, NotChecked=0, Total=8190 [2020-07-21 23:23:34,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 715 states. [2020-07-21 23:23:34,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 715 to 695. [2020-07-21 23:23:34,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 695 states. [2020-07-21 23:23:34,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 695 states to 695 states and 919 transitions. [2020-07-21 23:23:34,602 INFO L78 Accepts]: Start accepts. Automaton has 695 states and 919 transitions. Word has length 999 [2020-07-21 23:23:34,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:23:34,603 INFO L479 AbstractCegarLoop]: Abstraction has 695 states and 919 transitions. [2020-07-21 23:23:34,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-21 23:23:34,603 INFO L276 IsEmpty]: Start isEmpty. Operand 695 states and 919 transitions. [2020-07-21 23:23:34,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1007 [2020-07-21 23:23:34,611 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:23:34,611 INFO L422 BasicCegarLoop]: trace histogram [131, 131, 131, 130, 130, 130, 130, 21, 20, 20, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:23:34,812 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:23:34,812 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:23:34,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:23:34,813 INFO L82 PathProgramCache]: Analyzing trace with hash -1744475458, now seen corresponding path program 43 times [2020-07-21 23:23:34,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:23:34,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1520566153] [2020-07-21 23:23:34,814 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 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 [2020-07-21 23:23:35,083 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:23:35,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:23:35,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 1767 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 23:23:35,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:23:37,094 INFO L134 CoverageAnalysis]: Checked inductivity of 62602 backedges. 4166 proven. 23316 refuted. 0 times theorem prover too weak. 35120 trivial. 0 not checked. [2020-07-21 23:23:37,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:23:40,577 INFO L134 CoverageAnalysis]: Checked inductivity of 62602 backedges. 2158 proven. 23316 refuted. 0 times theorem prover too weak. 37128 trivial. 0 not checked. [2020-07-21 23:23:40,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1520566153] [2020-07-21 23:23:40,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:23:40,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 45 [2020-07-21 23:23:40,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777379774] [2020-07-21 23:23:40,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-07-21 23:23:40,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:23:40,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-07-21 23:23:40,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=375, Invalid=1605, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 23:23:40,579 INFO L87 Difference]: Start difference. First operand 695 states and 919 transitions. Second operand 45 states. [2020-07-21 23:24:13,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:24:13,552 INFO L93 Difference]: Finished difference Result 1187 states and 1603 transitions. [2020-07-21 23:24:13,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 185 states. [2020-07-21 23:24:13,557 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 1006 [2020-07-21 23:24:13,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:24:13,562 INFO L225 Difference]: With dead ends: 1187 [2020-07-21 23:24:13,563 INFO L226 Difference]: Without dead ends: 873 [2020-07-21 23:24:13,566 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2190 GetRequests, 1961 SyntacticMatches, 7 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20395 ImplicationChecksByTransitivity, 26.5s TimeCoverageRelationStatistics Valid=11282, Invalid=38670, Unknown=0, NotChecked=0, Total=49952 [2020-07-21 23:24:13,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 873 states. [2020-07-21 23:24:13,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 873 to 733. [2020-07-21 23:24:13,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 733 states. [2020-07-21 23:24:13,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 733 states to 733 states and 971 transitions. [2020-07-21 23:24:13,686 INFO L78 Accepts]: Start accepts. Automaton has 733 states and 971 transitions. Word has length 1006 [2020-07-21 23:24:13,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:24:13,687 INFO L479 AbstractCegarLoop]: Abstraction has 733 states and 971 transitions. [2020-07-21 23:24:13,687 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-07-21 23:24:13,687 INFO L276 IsEmpty]: Start isEmpty. Operand 733 states and 971 transitions. [2020-07-21 23:24:13,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1083 [2020-07-21 23:24:13,700 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:24:13,700 INFO L422 BasicCegarLoop]: trace histogram [141, 141, 141, 140, 140, 140, 140, 22, 21, 21, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:24:13,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:13,901 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:24:13,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:24:13,902 INFO L82 PathProgramCache]: Analyzing trace with hash 2076739844, now seen corresponding path program 44 times [2020-07-21 23:24:13,903 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:24:13,903 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118147658] [2020-07-21 23:24:13,903 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 [2020-07-21 23:24:14,195 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:24:14,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:24:14,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 1899 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 23:24:14,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:24:16,547 INFO L134 CoverageAnalysis]: Checked inductivity of 72506 backedges. 33214 proven. 3930 refuted. 0 times theorem prover too weak. 35362 trivial. 0 not checked. [2020-07-21 23:24:16,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:24:20,645 INFO L134 CoverageAnalysis]: Checked inductivity of 72506 backedges. 15493 proven. 14181 refuted. 0 times theorem prover too weak. 42832 trivial. 0 not checked. [2020-07-21 23:24:20,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118147658] [2020-07-21 23:24:20,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:24:20,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 43 [2020-07-21 23:24:20,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046861819] [2020-07-21 23:24:20,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-21 23:24:20,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:24:20,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-21 23:24:20,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=373, Invalid=1433, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 23:24:20,648 INFO L87 Difference]: Start difference. First operand 733 states and 971 transitions. Second operand 43 states. [2020-07-21 23:24:30,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:24:30,238 INFO L93 Difference]: Finished difference Result 1089 states and 1483 transitions. [2020-07-21 23:24:30,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2020-07-21 23:24:30,242 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 1082 [2020-07-21 23:24:30,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:24:30,248 INFO L225 Difference]: With dead ends: 1089 [2020-07-21 23:24:30,248 INFO L226 Difference]: Without dead ends: 804 [2020-07-21 23:24:30,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2226 GetRequests, 2115 SyntacticMatches, 7 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2563 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=3117, Invalid=8013, Unknown=0, NotChecked=0, Total=11130 [2020-07-21 23:24:30,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 804 states. [2020-07-21 23:24:30,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 804 to 785. [2020-07-21 23:24:30,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 785 states. [2020-07-21 23:24:30,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 785 states to 785 states and 1046 transitions. [2020-07-21 23:24:30,398 INFO L78 Accepts]: Start accepts. Automaton has 785 states and 1046 transitions. Word has length 1082 [2020-07-21 23:24:30,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:24:30,400 INFO L479 AbstractCegarLoop]: Abstraction has 785 states and 1046 transitions. [2020-07-21 23:24:30,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-21 23:24:30,400 INFO L276 IsEmpty]: Start isEmpty. Operand 785 states and 1046 transitions. [2020-07-21 23:24:30,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1090 [2020-07-21 23:24:30,411 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:24:30,412 INFO L422 BasicCegarLoop]: trace histogram [142, 142, 142, 141, 141, 141, 141, 22, 21, 21, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:24:30,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:30,627 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:24:30,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:24:30,628 INFO L82 PathProgramCache]: Analyzing trace with hash -690954159, now seen corresponding path program 45 times [2020-07-21 23:24:30,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:24:30,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1296245134] [2020-07-21 23:24:30,630 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 [2020-07-21 23:24:30,956 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:24:30,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:24:30,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 1911 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 23:24:30,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:24:32,451 INFO L134 CoverageAnalysis]: Checked inductivity of 73511 backedges. 8093 proven. 22813 refuted. 0 times theorem prover too weak. 42605 trivial. 0 not checked. [2020-07-21 23:24:32,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:24:36,154 INFO L134 CoverageAnalysis]: Checked inductivity of 73511 backedges. 3853 proven. 22813 refuted. 0 times theorem prover too weak. 46845 trivial. 0 not checked. [2020-07-21 23:24:36,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1296245134] [2020-07-21 23:24:36,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:24:36,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 28 [2020-07-21 23:24:36,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467311787] [2020-07-21 23:24:36,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 23:24:36,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:24:36,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 23:24:36,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=581, Unknown=0, NotChecked=0, Total=756 [2020-07-21 23:24:36,157 INFO L87 Difference]: Start difference. First operand 785 states and 1046 transitions. Second operand 28 states. [2020-07-21 23:24:49,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:24:49,141 INFO L93 Difference]: Finished difference Result 1700 states and 2319 transitions. [2020-07-21 23:24:49,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2020-07-21 23:24:49,146 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 1089 [2020-07-21 23:24:49,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:24:49,153 INFO L225 Difference]: With dead ends: 1700 [2020-07-21 23:24:49,154 INFO L226 Difference]: Without dead ends: 1392 [2020-07-21 23:24:49,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2270 GetRequests, 2143 SyntacticMatches, 8 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5615 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=3057, Invalid=11463, Unknown=0, NotChecked=0, Total=14520 [2020-07-21 23:24:49,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1392 states. [2020-07-21 23:24:49,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1392 to 984. [2020-07-21 23:24:49,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 984 states. [2020-07-21 23:24:49,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 984 states to 984 states and 1306 transitions. [2020-07-21 23:24:49,345 INFO L78 Accepts]: Start accepts. Automaton has 984 states and 1306 transitions. Word has length 1089 [2020-07-21 23:24:49,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:24:49,345 INFO L479 AbstractCegarLoop]: Abstraction has 984 states and 1306 transitions. [2020-07-21 23:24:49,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 23:24:49,346 INFO L276 IsEmpty]: Start isEmpty. Operand 984 states and 1306 transitions. [2020-07-21 23:24:49,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-21 23:24:49,356 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:24:49,357 INFO L422 BasicCegarLoop]: trace histogram [148, 148, 148, 147, 147, 147, 147, 23, 22, 22, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:24:49,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:49,558 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:24:49,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:24:49,559 INFO L82 PathProgramCache]: Analyzing trace with hash -944230286, now seen corresponding path program 46 times [2020-07-21 23:24:49,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:24:49,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582488798] [2020-07-21 23:24:49,560 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 [2020-07-21 23:24:49,872 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:24:49,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:24:49,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 1989 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 23:24:49,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:24:51,349 INFO L134 CoverageAnalysis]: Checked inductivity of 79907 backedges. 34663 proven. 2592 refuted. 0 times theorem prover too weak. 42652 trivial. 0 not checked. [2020-07-21 23:24:51,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:24:55,576 INFO L134 CoverageAnalysis]: Checked inductivity of 79907 backedges. 26745 proven. 2620 refuted. 0 times theorem prover too weak. 50542 trivial. 0 not checked. [2020-07-21 23:24:55,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582488798] [2020-07-21 23:24:55,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:24:55,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2020-07-21 23:24:55,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109048605] [2020-07-21 23:24:55,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 23:24:55,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:24:55,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 23:24:55,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=494, Unknown=0, NotChecked=0, Total=650 [2020-07-21 23:24:55,579 INFO L87 Difference]: Start difference. First operand 984 states and 1306 transitions. Second operand 26 states. [2020-07-21 23:24:59,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:24:59,303 INFO L93 Difference]: Finished difference Result 1307 states and 1766 transitions. [2020-07-21 23:24:59,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 23:24:59,307 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 1134 [2020-07-21 23:24:59,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:24:59,314 INFO L225 Difference]: With dead ends: 1307 [2020-07-21 23:24:59,314 INFO L226 Difference]: Without dead ends: 810 [2020-07-21 23:24:59,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2284 GetRequests, 2235 SyntacticMatches, 8 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=502, Invalid=1304, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 23:24:59,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 810 states. [2020-07-21 23:24:59,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 810 to 810. [2020-07-21 23:24:59,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 810 states. [2020-07-21 23:24:59,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 810 states to 810 states and 1076 transitions. [2020-07-21 23:24:59,464 INFO L78 Accepts]: Start accepts. Automaton has 810 states and 1076 transitions. Word has length 1134 [2020-07-21 23:24:59,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:24:59,466 INFO L479 AbstractCegarLoop]: Abstraction has 810 states and 1076 transitions. [2020-07-21 23:24:59,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 23:24:59,466 INFO L276 IsEmpty]: Start isEmpty. Operand 810 states and 1076 transitions. [2020-07-21 23:24:59,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1142 [2020-07-21 23:24:59,482 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:24:59,483 INFO L422 BasicCegarLoop]: trace histogram [149, 149, 149, 148, 148, 148, 148, 23, 22, 22, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:24:59,697 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:59,698 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:24:59,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:24:59,699 INFO L82 PathProgramCache]: Analyzing trace with hash -211111029, now seen corresponding path program 47 times [2020-07-21 23:24:59,699 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:24:59,700 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006631883] [2020-07-21 23:24:59,700 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 [2020-07-21 23:25:00,014 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:25:00,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:25:00,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 2001 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 23:25:00,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:25:02,027 INFO L134 CoverageAnalysis]: Checked inductivity of 80962 backedges. 7585 proven. 26386 refuted. 0 times theorem prover too weak. 46991 trivial. 0 not checked. [2020-07-21 23:25:02,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:25:06,191 INFO L134 CoverageAnalysis]: Checked inductivity of 80962 backedges. 3651 proven. 26386 refuted. 0 times theorem prover too weak. 50925 trivial. 0 not checked. [2020-07-21 23:25:06,191 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006631883] [2020-07-21 23:25:06,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:25:06,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 32 [2020-07-21 23:25:06,192 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045635507] [2020-07-21 23:25:06,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 23:25:06,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:25:06,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 23:25:06,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=779, Unknown=0, NotChecked=0, Total=992 [2020-07-21 23:25:06,194 INFO L87 Difference]: Start difference. First operand 810 states and 1076 transitions. Second operand 32 states. [2020-07-21 23:25:25,169 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 23:25:34,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:25:34,884 INFO L93 Difference]: Finished difference Result 1339 states and 1834 transitions. [2020-07-21 23:25:34,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2020-07-21 23:25:34,889 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 1141 [2020-07-21 23:25:34,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:25:34,896 INFO L225 Difference]: With dead ends: 1339 [2020-07-21 23:25:34,896 INFO L226 Difference]: Without dead ends: 1021 [2020-07-21 23:25:34,902 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2427 GetRequests, 2243 SyntacticMatches, 8 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13489 ImplicationChecksByTransitivity, 22.7s TimeCoverageRelationStatistics Valid=6498, Invalid=25008, Unknown=0, NotChecked=0, Total=31506 [2020-07-21 23:25:34,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1021 states. [2020-07-21 23:25:35,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1021 to 837. [2020-07-21 23:25:35,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 837 states. [2020-07-21 23:25:35,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1112 transitions. [2020-07-21 23:25:35,066 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1112 transitions. Word has length 1141 [2020-07-21 23:25:35,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:25:35,067 INFO L479 AbstractCegarLoop]: Abstraction has 837 states and 1112 transitions. [2020-07-21 23:25:35,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 23:25:35,068 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1112 transitions. [2020-07-21 23:25:35,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1194 [2020-07-21 23:25:35,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:25:35,081 INFO L422 BasicCegarLoop]: trace histogram [156, 156, 156, 155, 155, 155, 155, 24, 23, 23, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:25:35,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:35,282 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:25:35,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:25:35,284 INFO L82 PathProgramCache]: Analyzing trace with hash -2061681211, now seen corresponding path program 48 times [2020-07-21 23:25:35,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:25:35,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465653042] [2020-07-21 23:25:35,285 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 [2020-07-21 23:25:35,622 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:25:35,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:25:35,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 2091 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 23:25:35,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:25:37,648 INFO L134 CoverageAnalysis]: Checked inductivity of 88773 backedges. 38543 proven. 3172 refuted. 0 times theorem prover too weak. 47058 trivial. 0 not checked. [2020-07-21 23:25:37,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:25:43,248 INFO L134 CoverageAnalysis]: Checked inductivity of 88773 backedges. 27156 proven. 6189 refuted. 0 times theorem prover too weak. 55428 trivial. 0 not checked. [2020-07-21 23:25:43,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465653042] [2020-07-21 23:25:43,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:25:43,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 30 [2020-07-21 23:25:43,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727326858] [2020-07-21 23:25:43,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 23:25:43,251 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:25:43,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 23:25:43,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=672, Unknown=0, NotChecked=0, Total=870 [2020-07-21 23:25:43,251 INFO L87 Difference]: Start difference. First operand 837 states and 1112 transitions. Second operand 30 states. [2020-07-21 23:25:47,453 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 23:25:49,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:25:49,062 INFO L93 Difference]: Finished difference Result 1138 states and 1543 transitions. [2020-07-21 23:25:49,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-21 23:25:49,068 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 1193 [2020-07-21 23:25:49,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:25:49,075 INFO L225 Difference]: With dead ends: 1138 [2020-07-21 23:25:49,076 INFO L226 Difference]: Without dead ends: 837 [2020-07-21 23:25:49,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2413 GetRequests, 2349 SyntacticMatches, 8 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 645 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=911, Invalid=2395, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 23:25:49,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 837 states. [2020-07-21 23:25:49,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 837 to 837. [2020-07-21 23:25:49,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 837 states. [2020-07-21 23:25:49,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1110 transitions. [2020-07-21 23:25:49,273 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1110 transitions. Word has length 1193 [2020-07-21 23:25:49,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:25:49,275 INFO L479 AbstractCegarLoop]: Abstraction has 837 states and 1110 transitions. [2020-07-21 23:25:49,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 23:25:49,275 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1110 transitions. [2020-07-21 23:25:49,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1201 [2020-07-21 23:25:49,290 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:25:49,290 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 157, 156, 156, 156, 156, 24, 23, 23, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:25:49,491 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:49,491 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:25:49,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:25:49,492 INFO L82 PathProgramCache]: Analyzing trace with hash 1739494104, now seen corresponding path program 49 times [2020-07-21 23:25:49,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:25:49,493 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2134680668] [2020-07-21 23:25:49,494 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 [2020-07-21 23:25:49,842 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:25:49,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:25:49,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 2103 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 23:25:49,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:25:52,392 INFO L134 CoverageAnalysis]: Checked inductivity of 89885 backedges. 7011 proven. 30616 refuted. 0 times theorem prover too weak. 52258 trivial. 0 not checked. [2020-07-21 23:25:52,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:25:58,330 INFO L134 CoverageAnalysis]: Checked inductivity of 89885 backedges. 3423 proven. 30616 refuted. 0 times theorem prover too weak. 55846 trivial. 0 not checked. [2020-07-21 23:25:58,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2134680668] [2020-07-21 23:25:58,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:25:58,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 36 [2020-07-21 23:25:58,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871765638] [2020-07-21 23:25:58,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 23:25:58,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:25:58,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 23:25:58,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1003, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 23:25:58,333 INFO L87 Difference]: Start difference. First operand 837 states and 1110 transitions. Second operand 36 states. [2020-07-21 23:25:59,443 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:26:00,131 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 23:26:00,353 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:26:00,581 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 16 [2020-07-21 23:26:02,268 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:26:02,515 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:26:02,772 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 23:26:03,066 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:26:03,333 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:26:03,590 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:26:03,816 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 23:26:04,064 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 16 [2020-07-21 23:26:04,377 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:26:04,669 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 23:26:04,947 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:26:05,180 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:26:05,446 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 23:26:05,712 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 23:26:06,835 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:26:07,060 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 23:26:07,320 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:26:07,589 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:26:07,873 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 23:26:08,184 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:26:08,455 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:26:08,700 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:26:08,981 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:26:09,218 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 23:26:09,502 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 23:26:09,858 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:26:10,175 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 23:26:10,474 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:26:10,749 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 23:26:11,000 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:26:11,289 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 23:26:14,222 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 23:26:15,207 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 23:26:15,459 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:26:15,721 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:26:16,029 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:26:17,111 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:26:17,392 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:26:17,646 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 23:26:17,962 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 23:26:18,369 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:26:18,726 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 23:26:19,642 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:26:19,909 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 23:26:25,988 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:26:26,281 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 23:26:26,540 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 23:26:26,798 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:26:27,056 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 23:26:27,309 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 23:26:27,563 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 23:26:27,835 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:26:28,182 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:26:28,559 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:26:28,882 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:26:29,180 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:26:29,468 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:26:29,746 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:26:30,041 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 23:26:30,317 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 23:26:30,688 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 23:26:31,135 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:26:31,548 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:26:31,935 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:26:32,285 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:26:32,635 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:26:32,955 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 23:26:33,229 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 23:26:33,514 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 23:26:33,803 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:26:38,026 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:26:38,298 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:26:38,581 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:26:38,848 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:26:39,102 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 16 [2020-07-21 23:26:39,651 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:26:40,421 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:26:40,795 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:26:41,141 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:26:41,467 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:26:41,790 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:26:42,094 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:26:42,412 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 23:26:42,674 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:26:43,201 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 23:26:43,408 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 23:26:46,365 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:26:47,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:26:47,151 INFO L93 Difference]: Finished difference Result 1323 states and 1801 transitions. [2020-07-21 23:26:47,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 190 states. [2020-07-21 23:26:47,157 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 1200 [2020-07-21 23:26:47,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:26:47,166 INFO L225 Difference]: With dead ends: 1323 [2020-07-21 23:26:47,166 INFO L226 Difference]: Without dead ends: 1002 [2020-07-21 23:26:47,177 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2581 GetRequests, 2357 SyntacticMatches, 8 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20752 ImplicationChecksByTransitivity, 38.9s TimeCoverageRelationStatistics Valid=9652, Invalid=37654, Unknown=0, NotChecked=0, Total=47306 [2020-07-21 23:26:47,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1002 states. [2020-07-21 23:26:47,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1002 to 867. [2020-07-21 23:26:47,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 867 states. [2020-07-21 23:26:47,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1150 transitions. [2020-07-21 23:26:47,346 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1150 transitions. Word has length 1200 [2020-07-21 23:26:47,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:26:47,347 INFO L479 AbstractCegarLoop]: Abstraction has 867 states and 1150 transitions. [2020-07-21 23:26:47,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 23:26:47,347 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1150 transitions. [2020-07-21 23:26:47,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1260 [2020-07-21 23:26:47,362 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:26:47,362 INFO L422 BasicCegarLoop]: trace histogram [165, 165, 165, 164, 164, 164, 164, 25, 24, 24, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:26:47,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:26:47,564 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:26:47,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:26:47,565 INFO L82 PathProgramCache]: Analyzing trace with hash -891846805, now seen corresponding path program 50 times [2020-07-21 23:26:47,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:26:47,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [558555746] [2020-07-21 23:26:47,566 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 [2020-07-21 23:26:47,990 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:26:47,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:26:48,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 2205 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 23:26:48,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:26:50,498 INFO L134 CoverageAnalysis]: Checked inductivity of 99275 backedges. 43117 proven. 3824 refuted. 0 times theorem prover too weak. 52334 trivial. 0 not checked. [2020-07-21 23:26:50,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:26:56,509 INFO L134 CoverageAnalysis]: Checked inductivity of 99275 backedges. 27802 proven. 10229 refuted. 0 times theorem prover too weak. 61244 trivial. 0 not checked. [2020-07-21 23:26:56,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [558555746] [2020-07-21 23:26:56,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:26:56,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 34 [2020-07-21 23:26:56,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95950558] [2020-07-21 23:26:56,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 23:26:56,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:26:56,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 23:26:56,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=876, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 23:26:56,512 INFO L87 Difference]: Start difference. First operand 867 states and 1150 transitions. Second operand 34 states. [2020-07-21 23:27:03,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:27:03,968 INFO L93 Difference]: Finished difference Result 1168 states and 1580 transitions. [2020-07-21 23:27:03,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 23:27:03,973 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 1259 [2020-07-21 23:27:03,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:27:03,979 INFO L225 Difference]: With dead ends: 1168 [2020-07-21 23:27:03,979 INFO L226 Difference]: Without dead ends: 867 [2020-07-21 23:27:03,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2555 GetRequests, 2477 SyntacticMatches, 8 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1073 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=1406, Invalid=3706, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 23:27:03,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 867 states. [2020-07-21 23:27:04,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 867 to 867. [2020-07-21 23:27:04,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 867 states. [2020-07-21 23:27:04,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1148 transitions. [2020-07-21 23:27:04,197 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1148 transitions. Word has length 1259 [2020-07-21 23:27:04,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:27:04,198 INFO L479 AbstractCegarLoop]: Abstraction has 867 states and 1148 transitions. [2020-07-21 23:27:04,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 23:27:04,199 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1148 transitions. [2020-07-21 23:27:04,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1267 [2020-07-21 23:27:04,215 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:27:04,216 INFO L422 BasicCegarLoop]: trace histogram [166, 166, 166, 165, 165, 165, 165, 25, 24, 24, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:27:04,416 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:27:04,417 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:27:04,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:27:04,418 INFO L82 PathProgramCache]: Analyzing trace with hash -1524872590, now seen corresponding path program 51 times [2020-07-21 23:27:04,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:27:04,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1226386417] [2020-07-21 23:27:04,419 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 [2020-07-21 23:27:04,797 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:27:04,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:27:04,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 2217 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 23:27:04,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:27:08,117 INFO L134 CoverageAnalysis]: Checked inductivity of 100451 backedges. 6350 proven. 35584 refuted. 0 times theorem prover too weak. 58517 trivial. 0 not checked. [2020-07-21 23:27:08,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:27:15,695 INFO L134 CoverageAnalysis]: Checked inductivity of 100451 backedges. 3160 proven. 35584 refuted. 0 times theorem prover too weak. 61707 trivial. 0 not checked. [2020-07-21 23:27:15,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1226386417] [2020-07-21 23:27:15,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:27:15,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 40 [2020-07-21 23:27:15,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193868775] [2020-07-21 23:27:15,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 23:27:15,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:27:15,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 23:27:15,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=1253, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 23:27:15,699 INFO L87 Difference]: Start difference. First operand 867 states and 1148 transitions. Second operand 40 states. [2020-07-21 23:27:16,295 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:27:16,547 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:27:16,780 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:27:17,106 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 23:27:17,435 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:27:17,668 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 23:27:17,910 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 23:27:18,188 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:27:18,437 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:27:18,696 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:27:18,917 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:27:19,182 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:27:19,445 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:27:19,768 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 23:27:20,124 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 23:27:20,369 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 23:27:20,669 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:27:20,930 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:27:21,196 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:27:22,623 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 16 [2020-07-21 23:27:22,965 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:27:23,286 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 23:27:23,584 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:27:23,894 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 23:27:24,149 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:27:24,469 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 23:27:24,838 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 23:27:25,108 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:27:25,361 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:27:25,607 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:27:25,873 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:27:26,502 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:27:26,777 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:28,049 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:27:28,463 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:27:28,827 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:27:29,163 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:27:29,487 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:27:29,818 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:27:30,113 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 23:27:30,469 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:27:30,886 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:31,306 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:27:31,698 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:27:32,075 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:27:32,415 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:32,712 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:33,046 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 23:27:33,385 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:27:33,794 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:27:34,245 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 23:27:34,574 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:27:34,874 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 23:27:35,180 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:27:35,476 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:27:35,786 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:27:36,143 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 23:27:36,519 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:36,914 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:27:37,261 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:37,598 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:27:37,924 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:38,208 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:27:38,548 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:27:38,907 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:39,330 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:27:39,777 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:40,216 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:27:40,601 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:27:40,984 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:41,329 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:27:41,676 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 23:27:41,997 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 23:27:42,426 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:27:42,937 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:27:43,419 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:27:43,887 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:27:44,698 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:27:45,045 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:45,337 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:27:45,667 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:27:45,996 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:27:51,023 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:27:51,357 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:27:51,716 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 23:27:52,116 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:52,521 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:52,902 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:53,278 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 20 [2020-07-21 23:27:53,650 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 20 [2020-07-21 23:27:53,991 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:27:54,284 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 23:27:54,621 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:27:55,010 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:27:55,490 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:27:56,022 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:27:56,521 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:27:57,001 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:27:57,455 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:27:57,885 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:27:58,285 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:27:58,711 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:27:59,062 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-21 23:27:59,537 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:28:00,117 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:28:00,685 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:28:01,211 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:28:01,735 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:28:02,229 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:28:02,690 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:28:03,097 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:28:03,445 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:28:03,829 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:28:04,228 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:28:09,335 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:28:09,664 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 23:28:09,974 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:28:10,289 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:28:10,591 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:28:11,576 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 23:28:11,940 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:28:12,330 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:28:13,640 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 23:28:14,019 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 23:28:14,343 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:28:14,709 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 23:28:15,101 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 23:28:15,636 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:28:16,205 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:28:16,744 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:28:17,256 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:28:17,734 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:28:18,218 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 23:28:18,684 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:28:19,113 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:28:19,565 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 23:28:19,942 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 23:28:20,364 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:28:20,638 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 23:28:20,919 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:28:21,475 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:28:21,995 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 23:28:22,478 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 23:28:22,938 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:28:23,401 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:28:23,854 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:28:24,281 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 23:28:24,673 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:28:25,027 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:28:25,305 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 23:28:25,799 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:28:26,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:28:26,298 INFO L93 Difference]: Finished difference Result 1310 states and 1773 transitions. [2020-07-21 23:28:26,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 215 states. [2020-07-21 23:28:26,303 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 1266 [2020-07-21 23:28:26,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:28:26,311 INFO L225 Difference]: With dead ends: 1310 [2020-07-21 23:28:26,311 INFO L226 Difference]: Without dead ends: 986 [2020-07-21 23:28:26,324 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2738 GetRequests, 2485 SyntacticMatches, 8 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26619 ImplicationChecksByTransitivity, 56.5s TimeCoverageRelationStatistics Valid=12065, Invalid=48697, Unknown=0, NotChecked=0, Total=60762 [2020-07-21 23:28:26,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 986 states. [2020-07-21 23:28:26,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 986 to 900. [2020-07-21 23:28:26,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2020-07-21 23:28:26,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1192 transitions. [2020-07-21 23:28:26,529 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1192 transitions. Word has length 1266 [2020-07-21 23:28:26,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:28:26,530 INFO L479 AbstractCegarLoop]: Abstraction has 900 states and 1192 transitions. [2020-07-21 23:28:26,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 23:28:26,531 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1192 transitions. [2020-07-21 23:28:26,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1333 [2020-07-21 23:28:26,552 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:28:26,553 INFO L422 BasicCegarLoop]: trace histogram [175, 175, 175, 174, 174, 174, 174, 26, 25, 25, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:28:26,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:28:26,754 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:28:26,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:28:26,755 INFO L82 PathProgramCache]: Analyzing trace with hash -719015028, now seen corresponding path program 52 times [2020-07-21 23:28:26,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:28:26,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1724956103] [2020-07-21 23:28:26,756 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 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 [2020-07-21 23:28:27,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:28:27,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:28:27,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 2331 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 23:28:27,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:28:30,852 INFO L134 CoverageAnalysis]: Checked inductivity of 111605 backedges. 48457 proven. 4557 refuted. 0 times theorem prover too weak. 58591 trivial. 0 not checked. [2020-07-21 23:28:30,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:28:38,914 INFO L134 CoverageAnalysis]: Checked inductivity of 111605 backedges. 28755 proven. 14749 refuted. 0 times theorem prover too weak. 68101 trivial. 0 not checked. [2020-07-21 23:28:38,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1724956103] [2020-07-21 23:28:38,915 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:28:38,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 38 [2020-07-21 23:28:38,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343848723] [2020-07-21 23:28:38,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 23:28:38,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:28:38,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 23:28:38,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=1106, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 23:28:38,918 INFO L87 Difference]: Start difference. First operand 900 states and 1192 transitions. Second operand 38 states. [2020-07-21 23:28:51,258 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 15 [2020-07-21 23:28:51,493 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:28:51,739 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 23:28:52,019 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 23:28:52,303 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:28:52,578 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:28:52,891 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:28:53,476 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:28:53,814 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:28:54,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:28:54,696 INFO L93 Difference]: Finished difference Result 1201 states and 1621 transitions. [2020-07-21 23:28:54,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-21 23:28:54,704 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 1332 [2020-07-21 23:28:54,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:28:54,713 INFO L225 Difference]: With dead ends: 1201 [2020-07-21 23:28:54,714 INFO L226 Difference]: Without dead ends: 900 [2020-07-21 23:28:54,717 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2711 GetRequests, 2619 SyntacticMatches, 8 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1604 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=2005, Invalid=5305, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 23:28:54,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2020-07-21 23:28:54,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 900. [2020-07-21 23:28:54,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2020-07-21 23:28:54,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1190 transitions. [2020-07-21 23:28:54,907 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1190 transitions. Word has length 1332 [2020-07-21 23:28:54,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:28:54,908 INFO L479 AbstractCegarLoop]: Abstraction has 900 states and 1190 transitions. [2020-07-21 23:28:54,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 23:28:54,908 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1190 transitions. [2020-07-21 23:28:54,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1340 [2020-07-21 23:28:54,927 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:28:54,927 INFO L422 BasicCegarLoop]: trace histogram [176, 176, 176, 175, 175, 175, 175, 26, 25, 25, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:28:55,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:28:55,128 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:28:55,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:28:55,130 INFO L82 PathProgramCache]: Analyzing trace with hash -78422223, now seen corresponding path program 53 times [2020-07-21 23:28:55,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:28:55,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [417677230] [2020-07-21 23:28:55,131 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 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 [2020-07-21 23:28:55,532 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:28:55,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:28:55,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 2343 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 23:28:55,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:28:59,368 INFO L134 CoverageAnalysis]: Checked inductivity of 112852 backedges. 5581 proven. 41380 refuted. 0 times theorem prover too weak. 65891 trivial. 0 not checked. [2020-07-21 23:28:59,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:29:08,675 INFO L134 CoverageAnalysis]: Checked inductivity of 112852 backedges. 2853 proven. 41380 refuted. 0 times theorem prover too weak. 68619 trivial. 0 not checked. [2020-07-21 23:29:08,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [417677230] [2020-07-21 23:29:08,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:29:08,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 44 [2020-07-21 23:29:08,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158695552] [2020-07-21 23:29:08,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 23:29:08,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:29:08,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 23:29:08,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1529, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 23:29:08,679 INFO L87 Difference]: Start difference. First operand 900 states and 1190 transitions. Second operand 44 states. [2020-07-21 23:29:09,479 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:29:09,777 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:29:10,116 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:10,516 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:29:10,983 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 23:29:11,278 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:29:11,595 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 23:29:11,958 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:12,282 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:12,645 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:29:13,013 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 23:29:13,299 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:29:13,679 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 23:29:14,167 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:29:14,495 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:29:14,780 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:29:15,086 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:29:15,453 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:15,819 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:29:16,184 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:16,491 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:16,833 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 23:29:17,114 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:29:17,426 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:29:17,812 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:29:18,174 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:18,504 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:18,798 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:19,118 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:29:19,467 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:19,827 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:20,288 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 23:29:20,604 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:29:20,889 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 23:29:21,159 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:29:21,453 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:29:21,929 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:29:22,297 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:29:22,613 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:22,903 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:29:23,222 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:29:23,493 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:29:23,820 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:24,210 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 23:29:24,542 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:29:24,847 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:29:25,119 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:29:25,358 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:25,660 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 23:29:26,040 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:26,528 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:29:27,063 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:27,565 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:29:28,050 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:29:28,500 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:28,909 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:29,325 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 23:29:29,654 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:29:30,091 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 23:29:30,614 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 23:29:30,970 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:29:31,299 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:29:31,613 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 23:29:31,921 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:29:32,246 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:29:32,580 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:29:33,007 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:33,462 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:29:33,842 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:29:34,210 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:34,546 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:29:34,904 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:29:35,375 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:35,890 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:36,354 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:29:36,777 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:37,173 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:37,537 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:29:37,861 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:29:38,216 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 23:29:38,599 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 23:29:39,113 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:39,685 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 20 [2020-07-21 23:29:40,243 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:40,760 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:29:41,231 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:41,732 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:42,131 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:29:42,545 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 23:29:42,898 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-21 23:29:43,822 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:29:44,442 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:29:45,013 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:45,512 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:29:45,972 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:46,408 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:46,800 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:47,121 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:47,485 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:29:47,819 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:29:48,269 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:29:48,776 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:29:49,115 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:29:49,418 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 23:29:49,721 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:29:50,012 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 23:29:50,265 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:29:50,538 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:29:50,817 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 23:29:51,184 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:51,685 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:52,127 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:29:52,523 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:29:52,913 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:29:53,268 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:29:53,657 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:29:54,018 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-21 23:29:54,512 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:55,092 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:29:55,641 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:56,150 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:56,615 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:57,065 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:57,492 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:57,847 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:29:58,248 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 23:29:58,659 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:29:59,273 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:29:59,934 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 20 [2020-07-21 23:30:00,563 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:30:01,181 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:30:01,766 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:30:02,336 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:30:02,836 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:30:03,308 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 23:30:03,781 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 23:30:04,155 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 23:30:04,745 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:30:05,469 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:30:06,133 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:30:06,784 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:30:07,421 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:30:08,005 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:30:08,546 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:30:09,064 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:30:09,519 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:30:09,906 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:30:10,331 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:30:10,739 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:30:16,874 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:30:17,198 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:30:17,495 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:30:17,775 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:30:18,121 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:30:18,481 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:30:18,828 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:30:19,220 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 23:30:19,605 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:30:20,113 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:30:20,659 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:30:21,168 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:30:21,627 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:30:22,071 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:30:22,511 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:30:22,916 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:30:23,334 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 23:30:23,685 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 23:30:24,176 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:30:24,791 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:30:25,362 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:30:25,917 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:30:26,436 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:30:26,903 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:30:27,379 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:30:27,806 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:30:28,178 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 23:30:28,588 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 23:30:29,025 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:30:29,668 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:30:30,384 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 23:30:31,055 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:30:31,695 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:30:32,331 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 23:30:32,921 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 23:30:33,478 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 23:30:33,987 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 23:30:34,443 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:30:34,871 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 23:30:35,229 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 23:30:35,708 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:30:36,028 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 23:30:36,341 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:30:36,997 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:30:37,584 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 23:30:38,182 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:30:38,680 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 23:30:39,191 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:30:39,659 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:30:40,083 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 23:30:40,486 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:30:40,861 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:30:41,177 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:30:41,448 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 23:30:41,911 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:30:42,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:30:42,405 INFO L93 Difference]: Finished difference Result 1317 states and 1778 transitions. [2020-07-21 23:30:42,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 234 states. [2020-07-21 23:30:42,413 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 1339 [2020-07-21 23:30:42,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:30:42,423 INFO L225 Difference]: With dead ends: 1317 [2020-07-21 23:30:42,423 INFO L226 Difference]: Without dead ends: 990 [2020-07-21 23:30:42,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2904 GetRequests, 2627 SyntacticMatches, 8 SemanticMatches, 269 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32405 ImplicationChecksByTransitivity, 75.4s TimeCoverageRelationStatistics Valid=14907, Invalid=58263, Unknown=0, NotChecked=0, Total=73170 [2020-07-21 23:30:42,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 990 states. [2020-07-21 23:30:42,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 990 to 936. [2020-07-21 23:30:42,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 936 states. [2020-07-21 23:30:42,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 936 states to 936 states and 1238 transitions. [2020-07-21 23:30:42,639 INFO L78 Accepts]: Start accepts. Automaton has 936 states and 1238 transitions. Word has length 1339 [2020-07-21 23:30:42,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:30:42,640 INFO L479 AbstractCegarLoop]: Abstraction has 936 states and 1238 transitions. [2020-07-21 23:30:42,640 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 23:30:42,640 INFO L276 IsEmpty]: Start isEmpty. Operand 936 states and 1238 transitions. [2020-07-21 23:30:42,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1413 [2020-07-21 23:30:42,658 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:30:42,659 INFO L422 BasicCegarLoop]: trace histogram [186, 186, 186, 185, 185, 185, 185, 27, 26, 26, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:30:42,860 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:30:42,860 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:30:42,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:30:42,862 INFO L82 PathProgramCache]: Analyzing trace with hash 2025630034, now seen corresponding path program 54 times [2020-07-21 23:30:42,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:30:42,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772524707] [2020-07-21 23:30:42,863 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 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 [2020-07-21 23:30:43,279 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:30:43,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:30:43,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 2469 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 23:30:43,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:30:47,793 INFO L134 CoverageAnalysis]: Checked inductivity of 125976 backedges. 54644 proven. 5380 refuted. 0 times theorem prover too weak. 65952 trivial. 0 not checked. [2020-07-21 23:30:47,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:30:59,343 INFO L134 CoverageAnalysis]: Checked inductivity of 125976 backedges. 30096 proven. 19758 refuted. 0 times theorem prover too weak. 76122 trivial. 0 not checked. [2020-07-21 23:30:59,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772524707] [2020-07-21 23:30:59,344 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:30:59,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 42 [2020-07-21 23:30:59,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667953395] [2020-07-21 23:30:59,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-21 23:30:59,347 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:30:59,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-21 23:30:59,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=1362, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 23:30:59,348 INFO L87 Difference]: Start difference. First operand 936 states and 1238 transitions. Second operand 42 states. [2020-07-21 23:31:13,889 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 15 [2020-07-21 23:31:14,140 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:31:14,406 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 23:31:14,659 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:31:14,936 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 23:31:15,227 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:31:15,513 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:31:15,812 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 23:31:16,126 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:31:16,458 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:31:16,812 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:31:17,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:31:17,642 INFO L93 Difference]: Finished difference Result 1237 states and 1666 transitions. [2020-07-21 23:31:17,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-07-21 23:31:17,651 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 1412 [2020-07-21 23:31:17,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:31:17,659 INFO L225 Difference]: With dead ends: 1237 [2020-07-21 23:31:17,660 INFO L226 Difference]: Without dead ends: 936 [2020-07-21 23:31:17,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2882 GetRequests, 2775 SyntacticMatches, 8 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2295 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=2790, Invalid=7310, Unknown=0, NotChecked=0, Total=10100 [2020-07-21 23:31:17,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 936 states. [2020-07-21 23:31:17,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 936 to 887. [2020-07-21 23:31:17,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 887 states. [2020-07-21 23:31:17,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 887 states to 887 states and 1165 transitions. [2020-07-21 23:31:17,894 INFO L78 Accepts]: Start accepts. Automaton has 887 states and 1165 transitions. Word has length 1412 [2020-07-21 23:31:17,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:31:17,896 INFO L479 AbstractCegarLoop]: Abstraction has 887 states and 1165 transitions. [2020-07-21 23:31:17,896 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-21 23:31:17,897 INFO L276 IsEmpty]: Start isEmpty. Operand 887 states and 1165 transitions. [2020-07-21 23:31:17,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1420 [2020-07-21 23:31:17,919 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:31:17,919 INFO L422 BasicCegarLoop]: trace histogram [187, 187, 187, 186, 186, 186, 186, 27, 26, 26, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:31:18,120 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:31:18,121 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:31:18,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:31:18,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1207336619, now seen corresponding path program 55 times [2020-07-21 23:31:18,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:31:18,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1102006330] [2020-07-21 23:31:18,123 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 [2020-07-21 23:31:18,580 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:31:18,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:31:18,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 2481 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 23:31:18,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:31:23,862 INFO L134 CoverageAnalysis]: Checked inductivity of 127301 backedges. 4683 proven. 48103 refuted. 0 times theorem prover too weak. 74515 trivial. 0 not checked. [2020-07-21 23:31:23,862 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:31:35,686 INFO L134 CoverageAnalysis]: Checked inductivity of 127301 backedges. 2493 proven. 48103 refuted. 0 times theorem prover too weak. 76705 trivial. 0 not checked. [2020-07-21 23:31:35,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1102006330] [2020-07-21 23:31:35,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:31:35,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 48 [2020-07-21 23:31:35,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196044662] [2020-07-21 23:31:35,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 23:31:35,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:31:35,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 23:31:35,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=425, Invalid=1831, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 23:31:35,690 INFO L87 Difference]: Start difference. First operand 887 states and 1165 transitions. Second operand 48 states. [2020-07-21 23:31:36,483 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:31:36,809 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:31:37,151 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:31:37,559 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:31:38,008 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 23:31:38,334 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:31:38,682 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:31:39,053 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 23:31:39,369 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:31:39,688 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:31:39,970 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:31:40,310 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 23:31:40,636 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:31:41,146 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:31:41,695 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 23:31:42,105 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:31:42,593 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:31:43,034 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-21 23:31:43,431 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:31:43,841 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:31:44,213 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:31:44,565 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:31:44,980 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 23:31:45,418 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:31:45,876 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:31:46,396 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:31:46,840 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:31:47,276 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:31:47,784 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:31:48,166 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:31:48,684 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 23:31:49,263 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:31:49,685 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:31:50,049 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 23:31:50,442 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:31:50,877 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:31:51,505 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:31:51,972 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:31:52,379 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:31:52,778 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:31:53,133 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:31:53,564 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:31:54,043 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:31:54,563 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:31:55,149 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:31:55,639 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:31:56,083 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:31:56,501 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:31:56,972 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 23:31:57,376 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-21 23:31:57,857 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:31:58,451 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:31:59,014 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:31:59,535 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:00,029 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:00,499 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:32:00,912 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 23:32:01,392 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:32:01,900 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:32:02,494 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 23:32:03,102 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 23:32:03,472 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:32:03,809 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:32:04,161 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 23:32:04,513 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:32:04,870 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 23:32:05,284 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 23:32:05,713 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:32:06,165 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:32:06,555 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:06,926 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:32:07,303 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:32:07,631 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:32:07,998 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 23:32:08,620 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:32:09,084 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:32:09,503 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:32:09,906 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:32:10,379 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 23:32:10,843 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:32:11,325 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 23:32:11,723 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-21 23:32:12,280 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:12,963 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:32:13,595 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:32:14,216 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:32:14,786 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:32:15,308 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:32:15,779 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:32:16,192 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:16,686 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 23:32:17,190 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:17,871 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:32:18,646 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:32:19,349 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:32:19,834 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:20,310 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:32:20,785 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:32:21,263 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:21,698 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:22,156 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:32:22,506 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 23:32:22,955 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-21 23:32:23,464 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 23:32:23,851 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:32:24,176 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:32:24,488 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 23:32:24,818 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 23:32:25,117 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:32:25,453 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:32:25,831 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 22 [2020-07-21 23:32:26,256 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:26,677 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:32:27,061 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:32:27,424 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:27,761 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:32:28,055 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:32:28,330 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 23:32:28,641 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 23:32:28,994 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:29,464 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:29,975 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:32:30,470 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:30,917 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:31,289 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:32:31,669 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:32:32,012 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:32,392 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 23:32:32,892 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:32:33,398 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:32:33,883 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:32:34,326 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:32:34,767 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:35,178 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:35,527 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:32:36,687 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 23:32:37,243 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:32:37,887 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 20 [2020-07-21 23:32:38,511 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:32:39,122 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 20 [2020-07-21 23:32:39,716 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:40,283 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:40,819 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:41,294 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 23:32:41,712 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 20 [2020-07-21 23:32:42,198 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 23:32:42,560 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 23:32:43,119 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 23:32:43,776 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:32:44,412 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 23:32:45,052 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:32:45,651 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:32:46,228 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:32:46,775 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 23:32:47,256 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:32:47,690 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:32:48,132 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 23:32:48,484 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 23:32:48,872 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 23:32:49,256 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 23:32:49,746 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:32:50,118 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:32:50,517 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:32:50,879 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:32:51,233 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 23:32:51,568 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:32:51,899 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 23:32:52,212 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 23:32:52,574 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 23:32:52,958 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-21 23:32:53,392 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:32:53,860 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 23:32:54,273 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:32:54,695 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:32:55,087 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:32:55,460 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:32:55,839 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 23:32:56,164 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:32:56,538 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 23:32:56,962 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 23:32:57,505 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:32:58,077 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:32:58,559 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:32:59,039 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 23:32:59,521 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:32:59,964 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 23:33:00,338 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:33:00,713 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:33:01,116 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 23:33:01,491 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-21 23:33:01,935 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 23:33:02,459 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:33:02,971 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:33:04,690 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 23:33:05,126 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 23:33:05,546 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:33:05,891 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:33:06,309 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 23:33:06,730 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:33:07,343 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 23:33:08,018 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 23:33:08,658 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:33:09,303 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 23:33:09,914 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 23:33:10,491 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 23:33:11,063 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:33:11,573 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 23:33:12,034 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 23:33:12,485 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 23:33:12,900 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 23:33:13,261 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 23:33:13,753 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 23:33:14,066 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 23:33:14,788 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:33:15,368 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 23:33:15,916 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:33:16,478 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:33:17,001 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 23:33:17,511 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:33:18,002 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 23:33:18,450 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:33:18,878 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:33:19,279 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:33:19,615 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:33:19,914 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 23:33:20,674 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 23:33:21,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:33:21,206 INFO L93 Difference]: Finished difference Result 1261 states and 1689 transitions. [2020-07-21 23:33:21,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 248 states. [2020-07-21 23:33:21,214 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 1419 [2020-07-21 23:33:21,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:33:21,220 INFO L225 Difference]: With dead ends: 1261 [2020-07-21 23:33:21,220 INFO L226 Difference]: Without dead ends: 980 [2020-07-21 23:33:21,231 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3078 GetRequests, 2783 SyntacticMatches, 8 SemanticMatches, 287 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36629 ImplicationChecksByTransitivity, 85.5s TimeCoverageRelationStatistics Valid=16884, Invalid=66348, Unknown=0, NotChecked=0, Total=83232 [2020-07-21 23:33:21,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 980 states. [2020-07-21 23:33:21,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 980 to 926. [2020-07-21 23:33:21,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 926 states. [2020-07-21 23:33:21,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 926 states to 926 states and 1217 transitions. [2020-07-21 23:33:21,500 INFO L78 Accepts]: Start accepts. Automaton has 926 states and 1217 transitions. Word has length 1419 [2020-07-21 23:33:21,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:33:21,502 INFO L479 AbstractCegarLoop]: Abstraction has 926 states and 1217 transitions. [2020-07-21 23:33:21,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 23:33:21,502 INFO L276 IsEmpty]: Start isEmpty. Operand 926 states and 1217 transitions. [2020-07-21 23:33:21,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1500 [2020-07-21 23:33:21,522 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:33:21,522 INFO L422 BasicCegarLoop]: trace histogram [198, 198, 198, 197, 197, 197, 197, 28, 27, 27, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:33:21,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:33:21,724 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:33:21,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:33:21,725 INFO L82 PathProgramCache]: Analyzing trace with hash 30841381, now seen corresponding path program 56 times [2020-07-21 23:33:21,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:33:21,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [264460592] [2020-07-21 23:33:21,726 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 [2020-07-21 23:33:22,174 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:33:22,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:33:22,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 2619 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 23:33:22,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:33:26,797 INFO L134 CoverageAnalysis]: Checked inductivity of 142622 backedges. 61768 proven. 6302 refuted. 0 times theorem prover too weak. 74552 trivial. 0 not checked. [2020-07-21 23:33:26,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:33:37,287 INFO L134 CoverageAnalysis]: Checked inductivity of 142622 backedges. 31915 proven. 25265 refuted. 0 times theorem prover too weak. 85442 trivial. 0 not checked. [2020-07-21 23:33:37,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [264460592] [2020-07-21 23:33:37,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:33:37,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 46 [2020-07-21 23:33:37,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038631857] [2020-07-21 23:33:37,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-21 23:33:37,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:33:37,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-21 23:33:37,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=1644, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 23:33:37,290 INFO L87 Difference]: Start difference. First operand 926 states and 1217 transitions. Second operand 46 states. [2020-07-21 23:33:55,662 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 23:33:57,887 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17