/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:21:38,549 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:21:38,552 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:21:38,565 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:21:38,565 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:21:38,567 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:21:38,568 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:21:38,570 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:21:38,572 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:21:38,573 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:21:38,574 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:21:38,575 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:21:38,575 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:21:38,576 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:21:38,577 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:21:38,579 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:21:38,579 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:21:38,580 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:21:38,582 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:21:38,585 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:21:38,586 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:21:38,588 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:21:38,589 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:21:38,590 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:21:38,592 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:21:38,604 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:21:38,620 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:21:38,621 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:21:38,622 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:21:38,622 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:21:38,623 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:21:38,623 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:21:38,623 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:21:38,623 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:21:38,624 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:21:38,624 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:21:38,624 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:21:38,624 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:21:38,624 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:21:38,625 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:21:38,625 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:21:38,625 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:21:38,625 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:21:38,625 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:21:38,626 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:21:38,626 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:21:38,626 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:21:38,626 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:21:38,626 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:21:38,627 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:21:38,627 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:21:38,627 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:21:38,627 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:38,627 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:21:38,628 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:21:38,628 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:21:38,929 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:21:38,943 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:21:38,947 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:21:38,948 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:21:38,949 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:21:38,950 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-2.c [2020-07-20 13:21:39,023 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0aabe2ea/1e436ab9bb834413a52b10a04634fe0e/FLAG859d0bcd8 [2020-07-20 13:21:39,584 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:21:39,585 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_10-2.c [2020-07-20 13:21:39,596 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0aabe2ea/1e436ab9bb834413a52b10a04634fe0e/FLAG859d0bcd8 [2020-07-20 13:21:39,931 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0aabe2ea/1e436ab9bb834413a52b10a04634fe0e [2020-07-20 13:21:39,943 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:21:39,946 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:21:39,947 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:39,948 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:21:39,951 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:21:39,953 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:39" (1/1) ... [2020-07-20 13:21:39,956 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23e60a39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:39, skipping insertion in model container [2020-07-20 13:21:39,956 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:39" (1/1) ... [2020-07-20 13:21:39,965 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:21:39,987 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:21:40,232 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:40,237 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:21:40,258 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:40,277 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:21:40,278 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:40 WrapperNode [2020-07-20 13:21:40,278 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:40,279 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:21:40,279 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:21:40,279 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:21:40,297 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:40" (1/1) ... [2020-07-20 13:21:40,298 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:40" (1/1) ... [2020-07-20 13:21:40,305 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:40" (1/1) ... [2020-07-20 13:21:40,306 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:40" (1/1) ... [2020-07-20 13:21:40,443 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:40" (1/1) ... [2020-07-20 13:21:40,447 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:40" (1/1) ... [2020-07-20 13:21:40,452 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:40" (1/1) ... [2020-07-20 13:21:40,458 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:21:40,459 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:21:40,459 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:21:40,462 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:21:40,463 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:40" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:21:40,538 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:21:40,538 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:21:40,538 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 13:21:40,538 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 13:21:40,539 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:21:40,539 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:21:40,539 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:21:40,540 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 13:21:40,540 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 13:21:40,540 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:21:40,540 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:21:40,540 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:21:40,748 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:21:40,748 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:21:40,754 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:40 BoogieIcfgContainer [2020-07-20 13:21:40,754 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:21:40,755 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:21:40,756 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:21:40,759 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:21:40,760 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:21:39" (1/3) ... [2020-07-20 13:21:40,761 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ac23eb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:40, skipping insertion in model container [2020-07-20 13:21:40,761 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:40" (2/3) ... [2020-07-20 13:21:40,761 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ac23eb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:40, skipping insertion in model container [2020-07-20 13:21:40,762 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:40" (3/3) ... [2020-07-20 13:21:40,764 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_10-2.c [2020-07-20 13:21:40,774 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:21:40,780 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:21:40,794 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:21:40,820 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:21:40,820 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:21:40,820 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:21:40,820 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:21:40,821 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:21:40,821 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:21:40,821 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:21:40,821 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:21:40,843 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 13:21:40,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:21:40,850 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:40,851 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:40,851 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:40,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:40,857 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 13:21:40,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:40,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960724206] [2020-07-20 13:21:40,865 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:40,956 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:40,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:40,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:21:40,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:41,156 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:21:41,157 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:41,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960724206] [2020-07-20 13:21:41,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:41,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:21:41,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882423660] [2020-07-20 13:21:41,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:21:41,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:41,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:21:41,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:21:41,184 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 13:21:41,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:41,306 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 13:21:41,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:21:41,309 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:21:41,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:41,321 INFO L225 Difference]: With dead ends: 44 [2020-07-20 13:21:41,322 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 13:21:41,326 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:21:41,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 13:21:41,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 13:21:41,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 13:21:41,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 13:21:41,387 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 13:21:41,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:41,388 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 13:21:41,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:21:41,388 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 13:21:41,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:21:41,390 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:41,391 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:41,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:41,608 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:41,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:41,609 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 13:21:41,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:41,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1026098124] [2020-07-20 13:21:41,611 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:41,649 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:41,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:41,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:21:41,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:41,708 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:21:41,709 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:41,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1026098124] [2020-07-20 13:21:41,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:41,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:21:41,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377112537] [2020-07-20 13:21:41,713 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:21:41,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:41,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:21:41,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:21:41,715 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 13:21:41,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:41,825 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 13:21:41,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:21:41,827 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 13:21:41,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:41,829 INFO L225 Difference]: With dead ends: 36 [2020-07-20 13:21:41,831 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 13:21:41,833 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:21:41,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 13:21:41,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 13:21:41,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 13:21:41,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 13:21:41,857 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 13:21:41,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:41,858 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 13:21:41,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:21:41,860 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 13:21:41,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:21:41,863 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:41,864 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:42,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:42,081 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:42,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:42,082 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 13:21:42,083 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:42,083 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2070628015] [2020-07-20 13:21:42,084 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:42,134 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:42,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:42,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:42,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:42,238 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:21:42,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:42,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:42,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:42,517 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:21:42,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2070628015] [2020-07-20 13:21:42,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:42,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 13:21:42,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55656896] [2020-07-20 13:21:42,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 13:21:42,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:42,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 13:21:42,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 13:21:42,527 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 13:21:42,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:42,680 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 13:21:42,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:42,681 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 13:21:42,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:42,683 INFO L225 Difference]: With dead ends: 41 [2020-07-20 13:21:42,684 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 13:21:42,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:21:42,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 13:21:42,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 13:21:42,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 13:21:42,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 13:21:42,695 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 13:21:42,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:42,696 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 13:21:42,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 13:21:42,700 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 13:21:42,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:21:42,704 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:42,705 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:42,905 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:42,906 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:42,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:42,907 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 13:21:42,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:42,908 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1443858074] [2020-07-20 13:21:42,909 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:42,945 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:42,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:42,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:42,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:43,002 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:21:43,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:43,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:43,208 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:21:43,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1443858074] [2020-07-20 13:21:43,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:43,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 13:21:43,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509683513] [2020-07-20 13:21:43,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 13:21:43,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:43,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 13:21:43,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 13:21:43,211 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 13:21:43,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:43,346 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 13:21:43,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:43,347 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 13:21:43,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:43,349 INFO L225 Difference]: With dead ends: 46 [2020-07-20 13:21:43,350 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 13:21:43,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:21:43,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 13:21:43,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 13:21:43,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 13:21:43,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 13:21:43,361 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 13:21:43,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:43,361 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 13:21:43,361 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 13:21:43,361 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 13:21:43,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 13:21:43,363 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:43,363 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:43,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:43,571 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:43,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:43,572 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 13:21:43,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:43,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1701469410] [2020-07-20 13:21:43,573 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 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:43,631 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:43,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:43,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:21:43,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:43,711 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 13:21:43,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:43,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:44,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:44,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:44,109 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:21:44,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1701469410] [2020-07-20 13:21:44,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:44,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 13:21:44,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105520934] [2020-07-20 13:21:44,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:21:44,111 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:44,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:21:44,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:21:44,112 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 13:21:44,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:44,310 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 13:21:44,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:21:44,311 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 13:21:44,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:44,313 INFO L225 Difference]: With dead ends: 51 [2020-07-20 13:21:44,313 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 13:21:44,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:21:44,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 13:21:44,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 13:21:44,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 13:21:44,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 13:21:44,326 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 13:21:44,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:44,326 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 13:21:44,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:21:44,326 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 13:21:44,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 13:21:44,328 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:44,329 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:44,543 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:44,545 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:44,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:44,546 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 13:21:44,546 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:44,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [716919372] [2020-07-20 13:21:44,547 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:44,579 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:44,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:44,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:21:44,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:44,643 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 13:21:44,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:44,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:44,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:44,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:44,982 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:21:44,983 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [716919372] [2020-07-20 13:21:44,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:44,983 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 13:21:44,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493949065] [2020-07-20 13:21:44,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:21:44,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:44,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:21:44,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:21:44,985 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 13:21:45,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:45,186 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 13:21:45,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:21:45,189 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 13:21:45,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:45,195 INFO L225 Difference]: With dead ends: 56 [2020-07-20 13:21:45,195 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 13:21:45,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:21:45,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 13:21:45,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 13:21:45,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 13:21:45,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 13:21:45,220 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 13:21:45,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:45,225 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 13:21:45,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:21:45,226 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 13:21:45,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 13:21:45,231 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:45,232 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:45,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:45,436 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:45,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:45,436 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 13:21:45,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:45,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1999304739] [2020-07-20 13:21:45,437 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:45,474 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:45,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:45,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:21:45,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:45,553 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 13:21:45,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:45,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:45,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,112 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 13:21:46,113 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1999304739] [2020-07-20 13:21:46,113 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:46,113 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 13:21:46,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636575789] [2020-07-20 13:21:46,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:21:46,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:46,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:21:46,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:21:46,116 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 13:21:46,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:46,309 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 13:21:46,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:21:46,310 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 13:21:46,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:46,313 INFO L225 Difference]: With dead ends: 61 [2020-07-20 13:21:46,313 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 13:21:46,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:21:46,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 13:21:46,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 13:21:46,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 13:21:46,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 13:21:46,344 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 13:21:46,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:46,346 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 13:21:46,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:21:46,346 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 13:21:46,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 13:21:46,352 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:46,353 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:46,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:46,569 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:46,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:46,570 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 13:21:46,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:46,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1372162831] [2020-07-20 13:21:46,572 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:46,611 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:46,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:46,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:21:46,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:46,689 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-20 13:21:46,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:47,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,225 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 13:21:47,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1372162831] [2020-07-20 13:21:47,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:47,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 13:21:47,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553734775] [2020-07-20 13:21:47,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:21:47,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:47,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:21:47,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:21:47,230 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-20 13:21:47,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:47,429 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 13:21:47,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:21:47,430 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-20 13:21:47,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:47,433 INFO L225 Difference]: With dead ends: 66 [2020-07-20 13:21:47,433 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 13:21:47,435 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:21:47,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 13:21:47,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 13:21:47,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 13:21:47,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 13:21:47,448 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 13:21:47,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:47,449 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 13:21:47,449 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:21:47,449 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 13:21:47,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 13:21:47,451 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:47,451 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:47,664 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:47,665 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:47,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:47,666 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 13:21:47,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:47,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [915857712] [2020-07-20 13:21:47,667 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:47,720 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:47,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:47,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:21:47,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:47,820 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 13:21:47,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:48,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,766 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-20 13:21:48,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [915857712] [2020-07-20 13:21:48,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:48,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 13:21:48,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208447045] [2020-07-20 13:21:48,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 13:21:48,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:48,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 13:21:48,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:21:48,769 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-20 13:21:49,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:49,031 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 13:21:49,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:21:49,032 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-20 13:21:49,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:49,034 INFO L225 Difference]: With dead ends: 71 [2020-07-20 13:21:49,034 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 13:21:49,035 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:21:49,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 13:21:49,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 13:21:49,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 13:21:49,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 13:21:49,048 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 13:21:49,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:49,048 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 13:21:49,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 13:21:49,049 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 13:21:49,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 13:21:49,050 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:49,051 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:49,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:49,264 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:49,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:49,265 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 13:21:49,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:49,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [860346960] [2020-07-20 13:21:49,267 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:49,334 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:49,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:49,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:21:49,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:49,416 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-20 13:21:49,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:50,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:50,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:50,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:50,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:50,370 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 13:21:50,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [860346960] [2020-07-20 13:21:50,371 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:50,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 13:21:50,371 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415335992] [2020-07-20 13:21:50,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 13:21:50,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:50,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 13:21:50,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:21:50,375 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 16 states. [2020-07-20 13:21:50,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:50,613 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-20 13:21:50,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:21:50,614 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2020-07-20 13:21:50,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:50,617 INFO L225 Difference]: With dead ends: 76 [2020-07-20 13:21:50,617 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 13:21:50,618 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:21:50,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 13:21:50,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-20 13:21:50,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 13:21:50,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 13:21:50,647 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-20 13:21:50,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:50,648 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 13:21:50,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 13:21:50,648 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 13:21:50,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-20 13:21:50,651 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:50,652 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:50,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:50,861 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:50,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:50,861 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-20 13:21:50,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:50,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [187255947] [2020-07-20 13:21:50,862 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:50,957 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:50,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:50,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:21:50,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:51,090 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-20 13:21:51,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:52,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:52,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:52,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:52,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:52,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:52,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:52,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:52,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:52,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-20 13:21:52,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [187255947] [2020-07-20 13:21:52,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:52,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 13:21:52,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718091690] [2020-07-20 13:21:52,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 13:21:52,892 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:52,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 13:21:52,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:21:52,893 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 18 states. [2020-07-20 13:21:53,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:53,169 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-20 13:21:53,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:21:53,170 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 208 [2020-07-20 13:21:53,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:53,173 INFO L225 Difference]: With dead ends: 81 [2020-07-20 13:21:53,173 INFO L226 Difference]: Without dead ends: 77 [2020-07-20 13:21:53,174 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:21:53,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-20 13:21:53,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-20 13:21:53,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 13:21:53,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 13:21:53,189 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-20 13:21:53,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:53,190 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 13:21:53,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 13:21:53,190 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 13:21:53,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 13:21:53,192 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:53,192 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:53,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:53,405 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:53,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:53,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1180347891, now seen corresponding path program 2 times [2020-07-20 13:21:53,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:53,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1085512319] [2020-07-20 13:21:53,407 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:53,495 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:53,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:53,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:21:53,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:53,618 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 149 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-20 13:21:53,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:54,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:54,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:54,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:54,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:54,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:54,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:55,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:55,095 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-20 13:21:55,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1085512319] [2020-07-20 13:21:55,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:55,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 13:21:55,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301678157] [2020-07-20 13:21:55,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 13:21:55,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:55,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 13:21:55,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:21:55,101 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 18 states. [2020-07-20 13:21:55,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:55,377 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2020-07-20 13:21:55,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:21:55,378 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 121 [2020-07-20 13:21:55,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:55,381 INFO L225 Difference]: With dead ends: 86 [2020-07-20 13:21:55,381 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 13:21:55,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 214 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:21:55,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 13:21:55,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-07-20 13:21:55,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 13:21:55,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 13:21:55,393 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 121 [2020-07-20 13:21:55,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:55,394 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 13:21:55,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 13:21:55,394 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 13:21:55,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2020-07-20 13:21:55,397 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:55,397 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 11, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:55,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:55,611 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:55,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:55,612 INFO L82 PathProgramCache]: Analyzing trace with hash 2099307065, now seen corresponding path program 5 times [2020-07-20 13:21:55,612 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:55,613 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [400488414] [2020-07-20 13:21:55,613 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:55,733 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:55,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:55,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:21:55,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:55,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 331 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-20 13:21:55,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:57,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 352 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2020-07-20 13:21:58,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [400488414] [2020-07-20 13:21:58,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:58,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 13:21:58,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420004494] [2020-07-20 13:21:58,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:21:58,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:58,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:21:58,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:21:58,265 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 20 states. [2020-07-20 13:21:58,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:58,703 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-07-20 13:21:58,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:21:58,704 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2020-07-20 13:21:58,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:58,707 INFO L225 Difference]: With dead ends: 91 [2020-07-20 13:21:58,707 INFO L226 Difference]: Without dead ends: 87 [2020-07-20 13:21:58,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 359 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:21:58,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-20 13:21:58,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 60. [2020-07-20 13:21:58,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:21:58,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 13:21:58,721 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 195 [2020-07-20 13:21:58,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:58,722 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 13:21:58,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:21:58,722 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 13:21:58,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-20 13:21:58,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:58,726 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 12, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:58,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:58,939 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:58,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:58,939 INFO L82 PathProgramCache]: Analyzing trace with hash 266210309, now seen corresponding path program 3 times [2020-07-20 13:21:58,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:58,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1565541564] [2020-07-20 13:21:58,940 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:59,077 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:59,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:59,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:21:59,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:59,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 347 refuted. 0 times theorem prover too weak. 658 trivial. 0 not checked. [2020-07-20 13:21:59,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:00,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:01,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:01,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:01,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:01,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:01,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:01,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:01,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:01,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 371 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-20 13:22:01,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1565541564] [2020-07-20 13:22:01,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:01,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 13:22:01,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342425866] [2020-07-20 13:22:01,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:22:01,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:01,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:22:01,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:22:01,659 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 20 states. [2020-07-20 13:22:02,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:02,031 INFO L93 Difference]: Finished difference Result 96 states and 212 transitions. [2020-07-20 13:22:02,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:22:02,032 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 201 [2020-07-20 13:22:02,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:02,038 INFO L225 Difference]: With dead ends: 96 [2020-07-20 13:22:02,038 INFO L226 Difference]: Without dead ends: 92 [2020-07-20 13:22:02,040 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 370 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:22:02,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-20 13:22:02,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 60. [2020-07-20 13:22:02,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:22:02,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 13:22:02,065 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 201 [2020-07-20 13:22:02,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:02,068 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 13:22:02,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:22:02,068 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 13:22:02,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-20 13:22:02,075 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:02,075 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 22, 21, 21, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 10, 10, 10, 10, 10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:02,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:02,290 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:02,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:02,291 INFO L82 PathProgramCache]: Analyzing trace with hash -865443995, now seen corresponding path program 6 times [2020-07-20 13:22:02,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:02,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650729179] [2020-07-20 13:22:02,292 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:02,490 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:02,491 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:02,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 642 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:22:02,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:02,684 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 819 refuted. 0 times theorem prover too weak. 2713 trivial. 0 not checked. [2020-07-20 13:22:02,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:04,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:04,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:05,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:05,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:05,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:05,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:06,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:06,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:06,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:06,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:06,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:06,406 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 849 refuted. 0 times theorem prover too weak. 2683 trivial. 0 not checked. [2020-07-20 13:22:06,407 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650729179] [2020-07-20 13:22:06,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:06,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 13:22:06,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194424004] [2020-07-20 13:22:06,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:22:06,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:06,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:22:06,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:22:06,409 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 22 states. [2020-07-20 13:22:06,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:06,975 INFO L93 Difference]: Finished difference Result 101 states and 232 transitions. [2020-07-20 13:22:06,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:22:06,976 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 351 [2020-07-20 13:22:06,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:06,982 INFO L225 Difference]: With dead ends: 101 [2020-07-20 13:22:06,982 INFO L226 Difference]: Without dead ends: 97 [2020-07-20 13:22:06,983 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 667 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:22:06,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-20 13:22:07,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 65. [2020-07-20 13:22:07,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 13:22:07,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 13:22:07,006 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 351 [2020-07-20 13:22:07,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:07,007 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 13:22:07,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:22:07,008 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 13:22:07,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 13:22:07,012 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:07,013 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 22, 21, 21, 14, 14, 14, 14, 14, 14, 14, 14, 12, 10, 10, 10, 10, 10, 10, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:07,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:07,228 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:07,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:07,229 INFO L82 PathProgramCache]: Analyzing trace with hash 1413996641, now seen corresponding path program 3 times [2020-07-20 13:22:07,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:07,229 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1921313547] [2020-07-20 13:22:07,230 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:07,512 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:07,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:07,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 616 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:22:07,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:07,713 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 762 refuted. 0 times theorem prover too weak. 2319 trivial. 0 not checked. [2020-07-20 13:22:07,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:09,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:09,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:10,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,797 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 795 refuted. 0 times theorem prover too weak. 2286 trivial. 0 not checked. [2020-07-20 13:22:11,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1921313547] [2020-07-20 13:22:11,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:11,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 13:22:11,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736201104] [2020-07-20 13:22:11,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:22:11,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:11,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:22:11,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:22:11,801 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 22 states. [2020-07-20 13:22:12,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:12,347 INFO L93 Difference]: Finished difference Result 106 states and 254 transitions. [2020-07-20 13:22:12,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:22:12,348 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 337 [2020-07-20 13:22:12,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:12,352 INFO L225 Difference]: With dead ends: 106 [2020-07-20 13:22:12,353 INFO L226 Difference]: Without dead ends: 102 [2020-07-20 13:22:12,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 638 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:22:12,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-07-20 13:22:12,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 65. [2020-07-20 13:22:12,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 13:22:12,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 13:22:12,368 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 337 [2020-07-20 13:22:12,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:12,368 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 13:22:12,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:22:12,369 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 13:22:12,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 820 [2020-07-20 13:22:12,377 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:12,378 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 52, 52, 47, 36, 36, 36, 36, 36, 36, 36, 36, 26, 26, 26, 26, 26, 26, 26, 26, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:12,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:12,591 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:12,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:12,592 INFO L82 PathProgramCache]: Analyzing trace with hash -1230346157, now seen corresponding path program 7 times [2020-07-20 13:22:12,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:12,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805350584] [2020-07-20 13:22:12,593 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:13,000 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:13,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:13,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 1491 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:22:13,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:13,639 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2371 refuted. 0 times theorem prover too weak. 17847 trivial. 0 not checked. [2020-07-20 13:22:13,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:17,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:18,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:19,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:19,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:20,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:20,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:20,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:20,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:20,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:20,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:20,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:20,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:21,002 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2411 refuted. 0 times theorem prover too weak. 17807 trivial. 0 not checked. [2020-07-20 13:22:21,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805350584] [2020-07-20 13:22:21,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:21,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-20 13:22:21,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210572181] [2020-07-20 13:22:21,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:22:21,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:21,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:22:21,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:22:21,006 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 24 states. [2020-07-20 13:22:21,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:21,551 INFO L93 Difference]: Finished difference Result 111 states and 276 transitions. [2020-07-20 13:22:21,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:22:21,552 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 819 [2020-07-20 13:22:21,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:21,556 INFO L225 Difference]: With dead ends: 111 [2020-07-20 13:22:21,556 INFO L226 Difference]: Without dead ends: 107 [2020-07-20 13:22:21,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1648 GetRequests, 1599 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 13:22:21,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-20 13:22:21,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 70. [2020-07-20 13:22:21,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 13:22:21,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-20 13:22:21,576 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 819 [2020-07-20 13:22:21,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:21,578 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-20 13:22:21,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:22:21,578 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-20 13:22:21,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-07-20 13:22:21,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:21,581 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 27, 24, 24, 18, 18, 18, 18, 18, 18, 18, 18, 15, 12, 12, 12, 12, 12, 12, 12, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:21,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:21,796 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:21,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:21,797 INFO L82 PathProgramCache]: Analyzing trace with hash 2047786411, now seen corresponding path program 4 times [2020-07-20 13:22:21,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:21,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [858778940] [2020-07-20 13:22:21,798 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:22,091 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:22,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:22,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:22:22,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:22,335 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1118 refuted. 0 times theorem prover too weak. 3842 trivial. 0 not checked. [2020-07-20 13:22:22,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:25,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:25,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:25,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:26,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:27,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:27,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:27,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:27,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:27,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:27,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:27,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:27,941 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1162 refuted. 0 times theorem prover too weak. 3798 trivial. 0 not checked. [2020-07-20 13:22:27,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [858778940] [2020-07-20 13:22:27,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:27,942 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:22:27,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908817855] [2020-07-20 13:22:27,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:22:27,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:27,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:22:27,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:22:27,944 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 23 states. [2020-07-20 13:22:28,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:28,508 INFO L93 Difference]: Finished difference Result 116 states and 300 transitions. [2020-07-20 13:22:28,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:22:28,509 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 418 [2020-07-20 13:22:28,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:28,513 INFO L225 Difference]: With dead ends: 116 [2020-07-20 13:22:28,513 INFO L226 Difference]: Without dead ends: 112 [2020-07-20 13:22:28,514 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 845 GetRequests, 796 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:22:28,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-20 13:22:28,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 70. [2020-07-20 13:22:28,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 13:22:28,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-20 13:22:28,527 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 418 [2020-07-20 13:22:28,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:28,528 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-20 13:22:28,528 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:22:28,528 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-20 13:22:28,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 677 [2020-07-20 13:22:28,534 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:28,535 INFO L422 BasicCegarLoop]: trace histogram [62, 62, 42, 41, 41, 31, 31, 31, 31, 31, 31, 31, 31, 20, 20, 20, 20, 20, 20, 20, 20, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:28,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:28,750 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:28,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:28,751 INFO L82 PathProgramCache]: Analyzing trace with hash -1777656900, now seen corresponding path program 8 times [2020-07-20 13:22:28,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:28,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [934355091] [2020-07-20 13:22:28,751 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:29,180 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:29,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:29,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 1231 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:22:29,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:29,557 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2104 refuted. 0 times theorem prover too weak. 11666 trivial. 0 not checked. [2020-07-20 13:22:29,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:33,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:33,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:35,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:35,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:36,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:38,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:38,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:38,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:38,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:38,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:38,594 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2156 refuted. 0 times theorem prover too weak. 11614 trivial. 0 not checked. [2020-07-20 13:22:38,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [934355091] [2020-07-20 13:22:38,594 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:38,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 13:22:38,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985575773] [2020-07-20 13:22:38,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:22:38,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:38,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:22:38,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:22:38,598 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 25 states. [2020-07-20 13:22:39,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:39,237 INFO L93 Difference]: Finished difference Result 121 states and 324 transitions. [2020-07-20 13:22:39,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:22:39,238 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 676 [2020-07-20 13:22:39,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:39,242 INFO L225 Difference]: With dead ends: 121 [2020-07-20 13:22:39,243 INFO L226 Difference]: Without dead ends: 117 [2020-07-20 13:22:39,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1363 GetRequests, 1309 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:22:39,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-20 13:22:39,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 75. [2020-07-20 13:22:39,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-20 13:22:39,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 145 transitions. [2020-07-20 13:22:39,257 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 145 transitions. Word has length 676 [2020-07-20 13:22:39,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:39,258 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 145 transitions. [2020-07-20 13:22:39,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:22:39,259 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 145 transitions. [2020-07-20 13:22:39,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 755 [2020-07-20 13:22:39,267 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:39,267 INFO L422 BasicCegarLoop]: trace histogram [64, 64, 49, 47, 47, 32, 32, 32, 32, 32, 32, 32, 32, 26, 23, 23, 23, 23, 23, 23, 23, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:39,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:39,482 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:39,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:39,482 INFO L82 PathProgramCache]: Analyzing trace with hash -1813836186, now seen corresponding path program 4 times [2020-07-20 13:22:39,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:39,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1193031814] [2020-07-20 13:22:39,483 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:39,948 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:39,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:39,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 1369 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:22:39,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:40,360 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2048 refuted. 0 times theorem prover too weak. 14594 trivial. 0 not checked. [2020-07-20 13:22:40,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:43,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:43,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:45,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:46,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:46,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:46,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:47,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:47,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:47,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:47,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:47,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:47,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:47,979 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2088 refuted. 0 times theorem prover too weak. 14554 trivial. 0 not checked. [2020-07-20 13:22:47,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1193031814] [2020-07-20 13:22:47,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:47,980 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:22:47,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034643510] [2020-07-20 13:22:47,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:22:47,981 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:47,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:22:47,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:22:47,981 INFO L87 Difference]: Start difference. First operand 75 states and 145 transitions. Second operand 23 states. [2020-07-20 13:22:48,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:48,650 INFO L93 Difference]: Finished difference Result 159 states and 539 transitions. [2020-07-20 13:22:48,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:22:48,651 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 754 [2020-07-20 13:22:48,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:48,656 INFO L225 Difference]: With dead ends: 159 [2020-07-20 13:22:48,657 INFO L226 Difference]: Without dead ends: 155 [2020-07-20 13:22:48,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1517 GetRequests, 1468 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:22:48,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-20 13:22:48,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 77. [2020-07-20 13:22:48,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-07-20 13:22:48,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 152 transitions. [2020-07-20 13:22:48,677 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 152 transitions. Word has length 754 [2020-07-20 13:22:48,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:48,678 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 152 transitions. [2020-07-20 13:22:48,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:22:48,679 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 152 transitions. [2020-07-20 13:22:48,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 766 [2020-07-20 13:22:48,687 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:48,687 INFO L422 BasicCegarLoop]: trace histogram [66, 66, 47, 45, 45, 45, 33, 33, 33, 33, 33, 33, 33, 25, 22, 22, 22, 22, 22, 22, 22, 19, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:48,902 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:48,902 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:48,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:48,904 INFO L82 PathProgramCache]: Analyzing trace with hash 848822556, now seen corresponding path program 1 times [2020-07-20 13:22:48,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:48,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1128531494] [2020-07-20 13:22:48,905 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:49,450 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:49,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:49,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 1388 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:22:49,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:49,838 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1891 refuted. 0 times theorem prover too weak. 15332 trivial. 0 not checked. [2020-07-20 13:22:49,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:53,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:53,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:54,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:55,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:55,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:55,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:55,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:55,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:56,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:56,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:56,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:56,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:56,613 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1924 refuted. 0 times theorem prover too weak. 15299 trivial. 0 not checked. [2020-07-20 13:22:56,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1128531494] [2020-07-20 13:22:56,614 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:56,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:22:56,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008855503] [2020-07-20 13:22:56,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:22:56,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:56,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:22:56,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:22:56,617 INFO L87 Difference]: Start difference. First operand 77 states and 152 transitions. Second operand 21 states. [2020-07-20 13:22:57,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:57,164 INFO L93 Difference]: Finished difference Result 179 states and 673 transitions. [2020-07-20 13:22:57,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:22:57,166 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 765 [2020-07-20 13:22:57,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:57,172 INFO L225 Difference]: With dead ends: 179 [2020-07-20 13:22:57,172 INFO L226 Difference]: Without dead ends: 175 [2020-07-20 13:22:57,174 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1538 GetRequests, 1494 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:22:57,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2020-07-20 13:22:57,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 79. [2020-07-20 13:22:57,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-20 13:22:57,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 160 transitions. [2020-07-20 13:22:57,199 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 160 transitions. Word has length 765 [2020-07-20 13:22:57,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:57,200 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 160 transitions. [2020-07-20 13:22:57,200 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:22:57,200 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 160 transitions. [2020-07-20 13:22:57,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1080 [2020-07-20 13:22:57,215 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:57,216 INFO L422 BasicCegarLoop]: trace histogram [82, 82, 77, 77, 61, 57, 41, 41, 41, 41, 41, 41, 41, 38, 38, 38, 38, 38, 38, 38, 25, 20, 19, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:57,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:57,432 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:57,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:57,433 INFO L82 PathProgramCache]: Analyzing trace with hash 67032718, now seen corresponding path program 1 times [2020-07-20 13:22:57,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:57,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [634547198] [2020-07-20 13:22:57,435 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:58,100 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:58,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:58,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 1955 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:22:58,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:59,001 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3056 refuted. 0 times theorem prover too weak. 30846 trivial. 0 not checked. [2020-07-20 13:22:59,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:03,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:05,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:05,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:07,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:07,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:07,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:07,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:08,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:08,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:08,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:08,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:08,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:08,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:08,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:08,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:08,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:09,228 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3096 refuted. 0 times theorem prover too weak. 30806 trivial. 0 not checked. [2020-07-20 13:23:09,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [634547198] [2020-07-20 13:23:09,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:09,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:23:09,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814428288] [2020-07-20 13:23:09,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:23:09,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:09,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:23:09,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:23:09,232 INFO L87 Difference]: Start difference. First operand 79 states and 160 transitions. Second operand 23 states. [2020-07-20 13:23:09,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:09,958 INFO L93 Difference]: Finished difference Result 156 states and 522 transitions. [2020-07-20 13:23:09,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:23:09,962 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1079 [2020-07-20 13:23:09,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:09,968 INFO L225 Difference]: With dead ends: 156 [2020-07-20 13:23:09,968 INFO L226 Difference]: Without dead ends: 152 [2020-07-20 13:23:09,969 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2166 GetRequests, 2117 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:23:09,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-07-20 13:23:09,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 82. [2020-07-20 13:23:09,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 13:23:09,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 170 transitions. [2020-07-20 13:23:09,991 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 170 transitions. Word has length 1079 [2020-07-20 13:23:09,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:09,992 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 170 transitions. [2020-07-20 13:23:09,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:23:09,992 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 170 transitions. [2020-07-20 13:23:10,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 981 [2020-07-20 13:23:10,004 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:10,005 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 70, 70, 62, 53, 36, 36, 36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 35, 27, 17, 17, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:10,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:10,218 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:10,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:10,219 INFO L82 PathProgramCache]: Analyzing trace with hash -1973171480, now seen corresponding path program 2 times [2020-07-20 13:23:10,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:10,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1706783150] [2020-07-20 13:23:10,220 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:10,909 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:10,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:10,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 1772 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:23:10,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:12,169 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2408 refuted. 0 times theorem prover too weak. 25350 trivial. 0 not checked. [2020-07-20 13:23:12,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:16,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:16,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:17,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:17,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:18,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:18,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:19,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:19,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:19,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:19,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:20,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:20,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:20,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:20,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:20,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:20,763 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2441 refuted. 0 times theorem prover too weak. 25317 trivial. 0 not checked. [2020-07-20 13:23:20,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1706783150] [2020-07-20 13:23:20,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:20,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:23:20,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854660348] [2020-07-20 13:23:20,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:23:20,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:20,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:23:20,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:23:20,767 INFO L87 Difference]: Start difference. First operand 82 states and 170 transitions. Second operand 21 states. [2020-07-20 13:23:21,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:21,444 INFO L93 Difference]: Finished difference Result 174 states and 639 transitions. [2020-07-20 13:23:21,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:23:21,446 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 980 [2020-07-20 13:23:21,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:21,450 INFO L225 Difference]: With dead ends: 174 [2020-07-20 13:23:21,451 INFO L226 Difference]: Without dead ends: 170 [2020-07-20 13:23:21,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1967 GetRequests, 1923 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:23:21,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2020-07-20 13:23:21,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 89. [2020-07-20 13:23:21,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-20 13:23:21,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 197 transitions. [2020-07-20 13:23:21,478 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 197 transitions. Word has length 980 [2020-07-20 13:23:21,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:21,479 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 197 transitions. [2020-07-20 13:23:21,479 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:23:21,479 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 197 transitions. [2020-07-20 13:23:21,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1132 [2020-07-20 13:23:21,495 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:21,496 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 79, 79, 62, 60, 44, 44, 44, 44, 44, 44, 44, 39, 39, 39, 39, 39, 39, 39, 28, 21, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:21,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:21,709 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:21,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:21,711 INFO L82 PathProgramCache]: Analyzing trace with hash -1305135398, now seen corresponding path program 3 times [2020-07-20 13:23:21,711 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:21,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [36679621] [2020-07-20 13:23:21,711 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:22,403 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:22,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:22,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 2049 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:23:22,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:23,220 INFO L134 CoverageAnalysis]: Checked inductivity of 38045 backedges. 764 proven. 3579 refuted. 0 times theorem prover too weak. 33702 trivial. 0 not checked. [2020-07-20 13:23:23,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:29,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:31,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:33,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:34,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:35,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:35,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:35,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:35,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:35,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:36,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:36,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:36,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:36,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:36,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:36,974 INFO L134 CoverageAnalysis]: Checked inductivity of 38045 backedges. 770 proven. 3629 refuted. 0 times theorem prover too weak. 33646 trivial. 0 not checked. [2020-07-20 13:23:36,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [36679621] [2020-07-20 13:23:36,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:36,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 13:23:36,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872306941] [2020-07-20 13:23:36,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:23:36,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:36,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:23:36,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:23:36,978 INFO L87 Difference]: Start difference. First operand 89 states and 197 transitions. Second operand 25 states. [2020-07-20 13:23:38,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:38,043 INFO L93 Difference]: Finished difference Result 263 states and 1331 transitions. [2020-07-20 13:23:38,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:23:38,045 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1131 [2020-07-20 13:23:38,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:38,051 INFO L225 Difference]: With dead ends: 263 [2020-07-20 13:23:38,051 INFO L226 Difference]: Without dead ends: 142 [2020-07-20 13:23:38,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2271 GetRequests, 2217 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:23:38,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-07-20 13:23:38,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2020-07-20 13:23:38,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-20 13:23:38,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 326 transitions. [2020-07-20 13:23:38,083 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 326 transitions. Word has length 1131 [2020-07-20 13:23:38,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:38,084 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 326 transitions. [2020-07-20 13:23:38,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:23:38,084 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 326 transitions. [2020-07-20 13:23:38,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 850 [2020-07-20 13:23:38,096 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:38,097 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 60, 60, 48, 44, 32, 32, 32, 32, 32, 32, 32, 30, 30, 30, 30, 30, 30, 30, 18, 17, 16, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:38,310 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:38,311 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:38,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:38,312 INFO L82 PathProgramCache]: Analyzing trace with hash -183041251, now seen corresponding path program 4 times [2020-07-20 13:23:38,312 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:38,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [886521795] [2020-07-20 13:23:38,313 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:38,966 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:38,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:38,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 1542 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:23:38,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:39,397 INFO L134 CoverageAnalysis]: Checked inductivity of 21198 backedges. 533 proven. 2307 refuted. 0 times theorem prover too weak. 18358 trivial. 0 not checked. [2020-07-20 13:23:39,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:44,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:46,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:46,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:47,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:47,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:48,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:48,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:48,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:49,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:49,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:49,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:49,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:49,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:49,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:49,963 INFO L134 CoverageAnalysis]: Checked inductivity of 21198 backedges. 535 proven. 2345 refuted. 0 times theorem prover too weak. 18318 trivial. 0 not checked. [2020-07-20 13:23:49,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [886521795] [2020-07-20 13:23:49,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:49,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:23:49,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484628446] [2020-07-20 13:23:49,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:23:49,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:49,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:23:49,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:23:49,967 INFO L87 Difference]: Start difference. First operand 142 states and 326 transitions. Second operand 23 states. [2020-07-20 13:23:50,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:50,898 INFO L93 Difference]: Finished difference Result 253 states and 882 transitions. [2020-07-20 13:23:50,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:23:50,901 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 849 [2020-07-20 13:23:50,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:50,910 INFO L225 Difference]: With dead ends: 253 [2020-07-20 13:23:50,910 INFO L226 Difference]: Without dead ends: 239 [2020-07-20 13:23:50,914 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1706 GetRequests, 1657 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:23:50,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2020-07-20 13:23:50,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 140. [2020-07-20 13:23:50,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-20 13:23:50,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 319 transitions. [2020-07-20 13:23:50,964 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 319 transitions. Word has length 849 [2020-07-20 13:23:50,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:50,965 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 319 transitions. [2020-07-20 13:23:50,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:23:50,966 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 319 transitions. [2020-07-20 13:23:50,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 911 [2020-07-20 13:23:50,980 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:50,981 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 65, 65, 56, 49, 34, 34, 34, 34, 34, 34, 34, 32, 32, 32, 32, 32, 32, 32, 22, 19, 17, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:51,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:51,196 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:51,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:51,197 INFO L82 PathProgramCache]: Analyzing trace with hash 1047764743, now seen corresponding path program 5 times [2020-07-20 13:23:51,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:51,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931252536] [2020-07-20 13:23:51,200 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:51,949 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:51,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:51,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 1649 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:23:51,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:52,496 INFO L134 CoverageAnalysis]: Checked inductivity of 24376 backedges. 555 proven. 2170 refuted. 0 times theorem prover too weak. 21651 trivial. 0 not checked. [2020-07-20 13:23:52,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:56,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:56,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:58,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:00,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:00,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:01,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:01,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:01,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:01,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:01,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:01,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:01,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:01,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:01,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:02,371 INFO L134 CoverageAnalysis]: Checked inductivity of 24376 backedges. 555 proven. 2200 refuted. 0 times theorem prover too weak. 21621 trivial. 0 not checked. [2020-07-20 13:24:02,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931252536] [2020-07-20 13:24:02,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:02,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:24:02,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679917445] [2020-07-20 13:24:02,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:24:02,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:02,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:24:02,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:24:02,374 INFO L87 Difference]: Start difference. First operand 140 states and 319 transitions. Second operand 21 states. [2020-07-20 13:24:03,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:03,245 INFO L93 Difference]: Finished difference Result 283 states and 1099 transitions. [2020-07-20 13:24:03,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:24:03,248 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 910 [2020-07-20 13:24:03,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:03,261 INFO L225 Difference]: With dead ends: 283 [2020-07-20 13:24:03,262 INFO L226 Difference]: Without dead ends: 269 [2020-07-20 13:24:03,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1827 GetRequests, 1783 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:24:03,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2020-07-20 13:24:03,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 140. [2020-07-20 13:24:03,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-20 13:24:03,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 319 transitions. [2020-07-20 13:24:03,328 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 319 transitions. Word has length 910 [2020-07-20 13:24:03,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:03,329 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 319 transitions. [2020-07-20 13:24:03,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:24:03,330 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 319 transitions. [2020-07-20 13:24:03,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1215 [2020-07-20 13:24:03,358 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:03,359 INFO L422 BasicCegarLoop]: trace histogram [92, 92, 85, 85, 74, 71, 46, 46, 46, 46, 46, 46, 46, 42, 42, 42, 42, 42, 42, 42, 29, 28, 21, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:03,572 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:03,573 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:03,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:03,574 INFO L82 PathProgramCache]: Analyzing trace with hash 1069302877, now seen corresponding path program 6 times [2020-07-20 13:24:03,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:03,574 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1317506933] [2020-07-20 13:24:03,574 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:04,396 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:04,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:04,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 2197 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:24:04,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:05,225 INFO L134 CoverageAnalysis]: Checked inductivity of 43794 backedges. 815 proven. 3881 refuted. 0 times theorem prover too weak. 39098 trivial. 0 not checked. [2020-07-20 13:24:05,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:24:07,195 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:24:12,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:12,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:16,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:16,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:17,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:18,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:18,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:19,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:20,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:20,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:20,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:20,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:20,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:20,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:20,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:21,294 INFO L134 CoverageAnalysis]: Checked inductivity of 43794 backedges. 819 proven. 3933 refuted. 0 times theorem prover too weak. 39042 trivial. 0 not checked. [2020-07-20 13:24:21,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1317506933] [2020-07-20 13:24:21,295 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:21,296 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 13:24:21,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514045707] [2020-07-20 13:24:21,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:24:21,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:21,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:24:21,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:24:21,298 INFO L87 Difference]: Start difference. First operand 140 states and 319 transitions. Second operand 25 states. [2020-07-20 13:24:22,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:22,497 INFO L93 Difference]: Finished difference Result 403 states and 2104 transitions. [2020-07-20 13:24:22,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:24:22,499 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1214 [2020-07-20 13:24:22,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:22,507 INFO L225 Difference]: With dead ends: 403 [2020-07-20 13:24:22,507 INFO L226 Difference]: Without dead ends: 201 [2020-07-20 13:24:22,520 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2437 GetRequests, 2383 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:24:22,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-20 13:24:22,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 150. [2020-07-20 13:24:22,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-20 13:24:22,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-20 13:24:22,554 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 1214 [2020-07-20 13:24:22,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:22,555 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-20 13:24:22,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:24:22,555 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-20 13:24:22,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 983 [2020-07-20 13:24:22,572 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:22,573 INFO L422 BasicCegarLoop]: trace histogram [72, 72, 71, 71, 61, 56, 36, 36, 36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 35, 25, 21, 16, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:22,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:22,780 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:22,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:22,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1171024714, now seen corresponding path program 7 times [2020-07-20 13:24:22,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:22,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [570816176] [2020-07-20 13:24:22,782 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 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:23,774 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:23,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:23,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 1778 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:24:23,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:24,519 INFO L134 CoverageAnalysis]: Checked inductivity of 28434 backedges. 617 proven. 2386 refuted. 0 times theorem prover too weak. 25431 trivial. 0 not checked. [2020-07-20 13:24:24,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:24:29,750 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:24:29,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:29,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:31,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:32,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:32,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:33,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:33,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:33,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:33,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:34,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:34,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:34,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:34,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:35,056 INFO L134 CoverageAnalysis]: Checked inductivity of 28434 backedges. 619 proven. 2417 refuted. 0 times theorem prover too weak. 25398 trivial. 0 not checked. [2020-07-20 13:24:35,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [570816176] [2020-07-20 13:24:35,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:35,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:24:35,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360699490] [2020-07-20 13:24:35,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:24:35,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:35,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:24:35,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:24:35,060 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 21 states. [2020-07-20 13:24:35,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:35,664 INFO L93 Difference]: Finished difference Result 251 states and 812 transitions. [2020-07-20 13:24:35,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:24:35,665 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 982 [2020-07-20 13:24:35,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:35,672 INFO L225 Difference]: With dead ends: 251 [2020-07-20 13:24:35,672 INFO L226 Difference]: Without dead ends: 237 [2020-07-20 13:24:35,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1971 GetRequests, 1927 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:24:35,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2020-07-20 13:24:35,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 170. [2020-07-20 13:24:35,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-07-20 13:24:35,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 456 transitions. [2020-07-20 13:24:35,719 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 456 transitions. Word has length 982 [2020-07-20 13:24:35,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:35,720 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 456 transitions. [2020-07-20 13:24:35,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:24:35,720 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 456 transitions. [2020-07-20 13:24:35,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 821 [2020-07-20 13:24:35,735 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:35,736 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 56, 56, 44, 43, 32, 32, 32, 32, 32, 32, 32, 28, 28, 28, 28, 28, 28, 28, 21, 16, 13, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:35,950 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:35,951 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:35,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:35,952 INFO L82 PathProgramCache]: Analyzing trace with hash 1497856979, now seen corresponding path program 8 times [2020-07-20 13:24:35,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:35,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1809713475] [2020-07-20 13:24:35,953 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:36,905 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:36,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:36,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 1486 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:24:36,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:37,409 INFO L134 CoverageAnalysis]: Checked inductivity of 19825 backedges. 593 proven. 2147 refuted. 0 times theorem prover too weak. 17085 trivial. 0 not checked. [2020-07-20 13:24:37,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:24:42,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:44,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:44,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:46,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:47,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:47,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:48,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:48,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:48,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:48,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:49,301 INFO L134 CoverageAnalysis]: Checked inductivity of 19825 backedges. 595 proven. 2185 refuted. 0 times theorem prover too weak. 17045 trivial. 0 not checked. [2020-07-20 13:24:49,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1809713475] [2020-07-20 13:24:49,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:49,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:24:49,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710418117] [2020-07-20 13:24:49,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:24:49,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:49,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:24:49,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:24:49,304 INFO L87 Difference]: Start difference. First operand 170 states and 456 transitions. Second operand 23 states. [2020-07-20 13:24:50,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:50,224 INFO L93 Difference]: Finished difference Result 254 states and 839 transitions. [2020-07-20 13:24:50,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:24:50,226 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 820 [2020-07-20 13:24:50,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:50,232 INFO L225 Difference]: With dead ends: 254 [2020-07-20 13:24:50,232 INFO L226 Difference]: Without dead ends: 240 [2020-07-20 13:24:50,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1648 GetRequests, 1599 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:24:50,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2020-07-20 13:24:50,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 166. [2020-07-20 13:24:50,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-20 13:24:50,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 436 transitions. [2020-07-20 13:24:50,268 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 436 transitions. Word has length 820 [2020-07-20 13:24:50,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:50,269 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 436 transitions. [2020-07-20 13:24:50,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:24:50,269 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 436 transitions. [2020-07-20 13:24:50,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1543 [2020-07-20 13:24:50,298 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:50,299 INFO L422 BasicCegarLoop]: trace histogram [114, 114, 113, 113, 88, 85, 57, 57, 57, 57, 57, 57, 57, 56, 56, 56, 56, 56, 56, 56, 32, 28, 28, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:50,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:50,513 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:50,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:50,514 INFO L82 PathProgramCache]: Analyzing trace with hash -1067488340, now seen corresponding path program 9 times [2020-07-20 13:24:50,514 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:50,514 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [387721455] [2020-07-20 13:24:50,515 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:51,520 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:51,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:51,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 2790 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:24:51,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:52,941 INFO L134 CoverageAnalysis]: Checked inductivity of 71018 backedges. 978 proven. 5052 refuted. 0 times theorem prover too weak. 64988 trivial. 0 not checked. [2020-07-20 13:24:52,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:25:06,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:09,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:09,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:12,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:14,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:14,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:15,216 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 13:25:15,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:15,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:16,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:16,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:16,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:16,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:17,765 INFO L134 CoverageAnalysis]: Checked inductivity of 71018 backedges. 982 proven. 5104 refuted. 0 times theorem prover too weak. 64932 trivial. 0 not checked. [2020-07-20 13:25:17,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [387721455] [2020-07-20 13:25:17,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:25:17,766 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 13:25:17,766 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404162565] [2020-07-20 13:25:17,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:25:17,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:25:17,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:25:17,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:25:17,769 INFO L87 Difference]: Start difference. First operand 166 states and 436 transitions. Second operand 25 states. [2020-07-20 13:25:19,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:25:19,053 INFO L93 Difference]: Finished difference Result 264 states and 904 transitions. [2020-07-20 13:25:19,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:25:19,055 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1542 [2020-07-20 13:25:19,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:25:19,061 INFO L225 Difference]: With dead ends: 264 [2020-07-20 13:25:19,062 INFO L226 Difference]: Without dead ends: 201 [2020-07-20 13:25:19,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3093 GetRequests, 3039 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:25:19,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-20 13:25:19,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 179. [2020-07-20 13:25:19,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-20 13:25:19,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 489 transitions. [2020-07-20 13:25:19,099 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 489 transitions. Word has length 1542 [2020-07-20 13:25:19,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:25:19,100 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 489 transitions. [2020-07-20 13:25:19,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:25:19,100 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 489 transitions. [2020-07-20 13:25:19,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 978 [2020-07-20 13:25:19,115 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:25:19,116 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 66, 66, 59, 53, 38, 38, 38, 38, 38, 38, 38, 33, 33, 33, 33, 33, 33, 33, 26, 18, 15, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:25:19,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:19,331 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:25:19,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:25:19,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1084358648, now seen corresponding path program 10 times [2020-07-20 13:25:19,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:25:19,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [518754960] [2020-07-20 13:25:19,334 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:20,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:25:20,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:25:20,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 1771 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:25:20,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:25:20,908 INFO L134 CoverageAnalysis]: Checked inductivity of 28297 backedges. 625 proven. 2298 refuted. 0 times theorem prover too weak. 25374 trivial. 0 not checked. [2020-07-20 13:25:20,908 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:25:28,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:31,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:33,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:33,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:34,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:34,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:35,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:35,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:35,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:35,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:35,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:35,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:36,630 INFO L134 CoverageAnalysis]: Checked inductivity of 28297 backedges. 625 proven. 2330 refuted. 0 times theorem prover too weak. 25342 trivial. 0 not checked. [2020-07-20 13:25:36,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [518754960] [2020-07-20 13:25:36,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:25:36,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:25:36,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597821875] [2020-07-20 13:25:36,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:25:36,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:25:36,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:25:36,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:25:36,633 INFO L87 Difference]: Start difference. First operand 179 states and 489 transitions. Second operand 21 states. [2020-07-20 13:25:37,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:25:37,755 INFO L93 Difference]: Finished difference Result 295 states and 1090 transitions. [2020-07-20 13:25:37,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:25:37,760 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 977 [2020-07-20 13:25:37,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:25:37,773 INFO L225 Difference]: With dead ends: 295 [2020-07-20 13:25:37,774 INFO L226 Difference]: Without dead ends: 281 [2020-07-20 13:25:37,781 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1961 GetRequests, 1917 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:25:37,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2020-07-20 13:25:37,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 173. [2020-07-20 13:25:37,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 13:25:37,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 458 transitions. [2020-07-20 13:25:37,865 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 458 transitions. Word has length 977 [2020-07-20 13:25:37,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:25:37,867 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 458 transitions. [2020-07-20 13:25:37,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:25:37,867 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 458 transitions. [2020-07-20 13:25:37,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 982 [2020-07-20 13:25:37,901 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:25:37,902 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 67, 67, 59, 57, 38, 38, 38, 38, 38, 38, 38, 33, 33, 33, 33, 33, 33, 33, 24, 21, 19, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:25:38,304 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:38,305 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:25:38,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:25:38,306 INFO L82 PathProgramCache]: Analyzing trace with hash 1433070, now seen corresponding path program 11 times [2020-07-20 13:25:38,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:25:38,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [781235440] [2020-07-20 13:25:38,307 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:39,281 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:25:39,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:25:39,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 1777 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:25:39,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:25:39,804 INFO L134 CoverageAnalysis]: Checked inductivity of 28475 backedges. 588 proven. 2023 refuted. 0 times theorem prover too weak. 25864 trivial. 0 not checked. [2020-07-20 13:25:39,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:25:46,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:46,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:49,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:50,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:50,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:51,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:51,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:51,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:51,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:51,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:51,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:51,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:52,578 INFO L134 CoverageAnalysis]: Checked inductivity of 28475 backedges. 588 proven. 2047 refuted. 0 times theorem prover too weak. 25840 trivial. 0 not checked. [2020-07-20 13:25:52,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [781235440] [2020-07-20 13:25:52,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:25:52,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:25:52,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53280429] [2020-07-20 13:25:52,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:25:52,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:25:52,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:25:52,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:25:52,581 INFO L87 Difference]: Start difference. First operand 173 states and 458 transitions. Second operand 19 states. [2020-07-20 13:25:53,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:25:53,382 INFO L93 Difference]: Finished difference Result 348 states and 1590 transitions. [2020-07-20 13:25:53,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:25:53,385 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 981 [2020-07-20 13:25:53,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:25:53,397 INFO L225 Difference]: With dead ends: 348 [2020-07-20 13:25:53,398 INFO L226 Difference]: Without dead ends: 334 [2020-07-20 13:25:53,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1968 GetRequests, 1929 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:25:53,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2020-07-20 13:25:53,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 175. [2020-07-20 13:25:53,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2020-07-20 13:25:53,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 473 transitions. [2020-07-20 13:25:53,459 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 473 transitions. Word has length 981 [2020-07-20 13:25:53,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:25:53,460 INFO L479 AbstractCegarLoop]: Abstraction has 175 states and 473 transitions. [2020-07-20 13:25:53,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:25:53,460 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 473 transitions. [2020-07-20 13:25:53,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1259 [2020-07-20 13:25:53,480 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:25:53,480 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 91, 91, 72, 69, 47, 47, 47, 47, 47, 47, 47, 45, 45, 45, 45, 45, 45, 45, 25, 25, 24, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:25:53,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:53,696 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:25:53,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:25:53,697 INFO L82 PathProgramCache]: Analyzing trace with hash 63882103, now seen corresponding path program 12 times [2020-07-20 13:25:53,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:25:53,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602309960] [2020-07-20 13:25:53,698 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:54,752 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:25:54,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:25:54,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 2278 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:25:54,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:25:56,015 INFO L134 CoverageAnalysis]: Checked inductivity of 47050 backedges. 807 proven. 3030 refuted. 0 times theorem prover too weak. 43213 trivial. 0 not checked. [2020-07-20 13:25:56,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:26:02,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:02,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:06,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:06,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:08,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:08,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:09,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:09,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:09,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:09,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:09,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:09,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:10,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:10,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:10,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:11,539 INFO L134 CoverageAnalysis]: Checked inductivity of 47050 backedges. 809 proven. 3058 refuted. 0 times theorem prover too weak. 43183 trivial. 0 not checked. [2020-07-20 13:26:11,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602309960] [2020-07-20 13:26:11,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:26:11,541 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:26:11,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103696187] [2020-07-20 13:26:11,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:26:11,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:26:11,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:26:11,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:26:11,544 INFO L87 Difference]: Start difference. First operand 175 states and 473 transitions. Second operand 21 states. [2020-07-20 13:26:12,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:26:12,279 INFO L93 Difference]: Finished difference Result 261 states and 855 transitions. [2020-07-20 13:26:12,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:26:12,281 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1258 [2020-07-20 13:26:12,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:26:12,287 INFO L225 Difference]: With dead ends: 261 [2020-07-20 13:26:12,287 INFO L226 Difference]: Without dead ends: 247 [2020-07-20 13:26:12,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2523 GetRequests, 2479 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:26:12,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2020-07-20 13:26:12,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 173. [2020-07-20 13:26:12,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 13:26:12,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 458 transitions. [2020-07-20 13:26:12,317 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 458 transitions. Word has length 1258 [2020-07-20 13:26:12,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:26:12,318 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 458 transitions. [2020-07-20 13:26:12,319 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:26:12,319 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 458 transitions. [2020-07-20 13:26:12,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 898 [2020-07-20 13:26:12,331 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:26:12,332 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 64, 64, 53, 51, 33, 33, 33, 33, 33, 33, 33, 32, 32, 32, 32, 32, 32, 32, 20, 19, 16, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:26:12,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:12,545 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:26:12,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:26:12,545 INFO L82 PathProgramCache]: Analyzing trace with hash 2001739184, now seen corresponding path program 13 times [2020-07-20 13:26:12,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:26:12,546 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [796734608] [2020-07-20 13:26:12,546 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:13,521 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:26:13,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:26:13,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 1627 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:26:13,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:26:14,056 INFO L134 CoverageAnalysis]: Checked inductivity of 23657 backedges. 733 proven. 2323 refuted. 0 times theorem prover too weak. 20601 trivial. 0 not checked. [2020-07-20 13:26:14,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:26:19,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:21,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:21,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:23,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:24,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:24,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:24,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:24,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:24,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:24,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:24,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:24,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:24,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:25,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:25,683 INFO L134 CoverageAnalysis]: Checked inductivity of 23657 backedges. 741 proven. 2359 refuted. 0 times theorem prover too weak. 20557 trivial. 0 not checked. [2020-07-20 13:26:25,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [796734608] [2020-07-20 13:26:25,684 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:26:25,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:26:25,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927518408] [2020-07-20 13:26:25,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:26:25,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:26:25,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:26:25,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:26:25,686 INFO L87 Difference]: Start difference. First operand 173 states and 458 transitions. Second operand 23 states. [2020-07-20 13:26:26,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:26:26,531 INFO L93 Difference]: Finished difference Result 296 states and 1021 transitions. [2020-07-20 13:26:26,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:26:26,532 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 897 [2020-07-20 13:26:26,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:26:26,537 INFO L225 Difference]: With dead ends: 296 [2020-07-20 13:26:26,537 INFO L226 Difference]: Without dead ends: 233 [2020-07-20 13:26:26,541 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1802 GetRequests, 1753 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:26:26,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2020-07-20 13:26:26,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 187. [2020-07-20 13:26:26,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2020-07-20 13:26:26,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 513 transitions. [2020-07-20 13:26:26,568 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 513 transitions. Word has length 897 [2020-07-20 13:26:26,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:26:26,568 INFO L479 AbstractCegarLoop]: Abstraction has 187 states and 513 transitions. [2020-07-20 13:26:26,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:26:26,569 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 513 transitions. [2020-07-20 13:26:26,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1045 [2020-07-20 13:26:26,583 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:26:26,583 INFO L422 BasicCegarLoop]: trace histogram [78, 78, 75, 75, 61, 58, 39, 39, 39, 39, 39, 39, 39, 37, 37, 37, 37, 37, 37, 37, 24, 19, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:26:26,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:26,798 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:26:26,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:26:26,799 INFO L82 PathProgramCache]: Analyzing trace with hash -783187745, now seen corresponding path program 14 times [2020-07-20 13:26:26,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:26:26,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698758257] [2020-07-20 13:26:26,800 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:27,853 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:26:27,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:26:27,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 1888 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:26:27,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:26:28,406 INFO L134 CoverageAnalysis]: Checked inductivity of 32223 backedges. 794 proven. 2409 refuted. 0 times theorem prover too weak. 29020 trivial. 0 not checked. [2020-07-20 13:26:28,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:26:33,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:33,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:36,024 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:26:36,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:37,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:37,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:38,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:38,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:38,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:38,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:38,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:39,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:39,946 INFO L134 CoverageAnalysis]: Checked inductivity of 32223 backedges. 796 proven. 2440 refuted. 0 times theorem prover too weak. 28987 trivial. 0 not checked. [2020-07-20 13:26:39,947 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698758257] [2020-07-20 13:26:39,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:26:39,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:26:39,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106034169] [2020-07-20 13:26:39,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:26:39,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:26:39,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:26:39,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:26:39,949 INFO L87 Difference]: Start difference. First operand 187 states and 513 transitions. Second operand 21 states. [2020-07-20 13:26:40,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:26:40,626 INFO L93 Difference]: Finished difference Result 297 states and 1088 transitions. [2020-07-20 13:26:40,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:26:40,628 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1044 [2020-07-20 13:26:40,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:26:40,634 INFO L225 Difference]: With dead ends: 297 [2020-07-20 13:26:40,634 INFO L226 Difference]: Without dead ends: 280 [2020-07-20 13:26:40,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2095 GetRequests, 2051 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:26:40,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-20 13:26:40,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 216. [2020-07-20 13:26:40,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-07-20 13:26:40,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 668 transitions. [2020-07-20 13:26:40,675 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 668 transitions. Word has length 1044 [2020-07-20 13:26:40,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:26:40,676 INFO L479 AbstractCegarLoop]: Abstraction has 216 states and 668 transitions. [2020-07-20 13:26:40,676 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:26:40,676 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 668 transitions. [2020-07-20 13:26:40,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1302 [2020-07-20 13:26:40,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:26:40,697 INFO L422 BasicCegarLoop]: trace histogram [101, 101, 92, 92, 69, 67, 50, 50, 50, 50, 50, 50, 50, 46, 46, 46, 46, 46, 46, 46, 34, 23, 21, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:26:40,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:40,910 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:26:40,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:26:40,911 INFO L82 PathProgramCache]: Analyzing trace with hash 415164579, now seen corresponding path program 15 times [2020-07-20 13:26:40,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:26:40,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2112822400] [2020-07-20 13:26:40,912 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:42,050 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:26:42,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:26:42,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 2359 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:26:42,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:26:42,906 INFO L134 CoverageAnalysis]: Checked inductivity of 50541 backedges. 930 proven. 3554 refuted. 0 times theorem prover too weak. 46057 trivial. 0 not checked. [2020-07-20 13:26:42,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:26:50,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:54,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:56,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:57,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:57,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:57,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:57,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:58,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:58,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:58,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:58,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:58,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:59,845 INFO L134 CoverageAnalysis]: Checked inductivity of 50541 backedges. 934 proven. 3590 refuted. 0 times theorem prover too weak. 46017 trivial. 0 not checked. [2020-07-20 13:26:59,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2112822400] [2020-07-20 13:26:59,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:26:59,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:26:59,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44756407] [2020-07-20 13:26:59,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:26:59,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:26:59,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:26:59,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:26:59,848 INFO L87 Difference]: Start difference. First operand 216 states and 668 transitions. Second operand 23 states. [2020-07-20 13:27:00,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:27:00,753 INFO L93 Difference]: Finished difference Result 293 states and 1058 transitions. [2020-07-20 13:27:00,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:27:00,756 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1301 [2020-07-20 13:27:00,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:27:00,762 INFO L225 Difference]: With dead ends: 293 [2020-07-20 13:27:00,762 INFO L226 Difference]: Without dead ends: 276 [2020-07-20 13:27:00,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2610 GetRequests, 2561 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:27:00,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2020-07-20 13:27:00,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 209. [2020-07-20 13:27:00,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2020-07-20 13:27:00,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 628 transitions. [2020-07-20 13:27:00,803 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 628 transitions. Word has length 1301 [2020-07-20 13:27:00,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:27:00,804 INFO L479 AbstractCegarLoop]: Abstraction has 209 states and 628 transitions. [2020-07-20 13:27:00,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:27:00,804 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 628 transitions. [2020-07-20 13:27:00,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1387 [2020-07-20 13:27:00,826 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:27:00,826 INFO L422 BasicCegarLoop]: trace histogram [105, 105, 98, 98, 81, 80, 52, 52, 52, 52, 52, 52, 52, 49, 49, 49, 49, 49, 49, 49, 32, 28, 24, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:27:01,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:01,040 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:27:01,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:27:01,041 INFO L82 PathProgramCache]: Analyzing trace with hash -1308983224, now seen corresponding path program 16 times [2020-07-20 13:27:01,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:27:01,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1177430116] [2020-07-20 13:27:01,041 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:02,178 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:27:02,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:27:02,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 2508 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:27:02,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:27:03,115 INFO L134 CoverageAnalysis]: Checked inductivity of 57260 backedges. 1091 proven. 4295 refuted. 0 times theorem prover too weak. 51874 trivial. 0 not checked. [2020-07-20 13:27:03,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:27:16,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:20,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:20,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:23,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:24,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:24,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:25,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:25,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:26,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:26,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:26,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:26,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:28,166 INFO L134 CoverageAnalysis]: Checked inductivity of 57260 backedges. 1093 proven. 4349 refuted. 0 times theorem prover too weak. 51818 trivial. 0 not checked. [2020-07-20 13:27:28,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1177430116] [2020-07-20 13:27:28,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:27:28,167 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 13:27:28,167 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686094227] [2020-07-20 13:27:28,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:27:28,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:27:28,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:27:28,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:27:28,170 INFO L87 Difference]: Start difference. First operand 209 states and 628 transitions. Second operand 25 states. [2020-07-20 13:27:29,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:27:29,589 INFO L93 Difference]: Finished difference Result 303 states and 1021 transitions. [2020-07-20 13:27:29,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:27:29,592 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1386 [2020-07-20 13:27:29,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:27:29,597 INFO L225 Difference]: With dead ends: 303 [2020-07-20 13:27:29,597 INFO L226 Difference]: Without dead ends: 257 [2020-07-20 13:27:29,601 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2781 GetRequests, 2727 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:27:29,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-20 13:27:29,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 248. [2020-07-20 13:27:29,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-20 13:27:29,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 722 transitions. [2020-07-20 13:27:29,637 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 722 transitions. Word has length 1386 [2020-07-20 13:27:29,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:27:29,638 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 722 transitions. [2020-07-20 13:27:29,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:27:29,639 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 722 transitions. [2020-07-20 13:27:29,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1178 [2020-07-20 13:27:29,656 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:27:29,657 INFO L422 BasicCegarLoop]: trace histogram [87, 87, 86, 86, 67, 65, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 24, 22, 22, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:27:29,871 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:29,872 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:27:29,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:27:29,873 INFO L82 PathProgramCache]: Analyzing trace with hash 530745443, now seen corresponding path program 17 times [2020-07-20 13:27:29,873 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:27:29,873 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1331745469] [2020-07-20 13:27:29,873 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:30,992 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:27:30,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:27:30,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 2133 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:27:31,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:27:31,729 INFO L134 CoverageAnalysis]: Checked inductivity of 41099 backedges. 863 proven. 2708 refuted. 0 times theorem prover too weak. 37528 trivial. 0 not checked. [2020-07-20 13:27:31,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:27:41,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:46,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:46,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:50,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:50,790 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 13:27:51,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:51,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:51,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:52,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:52,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:52,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:52,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:54,790 INFO L134 CoverageAnalysis]: Checked inductivity of 41099 backedges. 865 proven. 2736 refuted. 0 times theorem prover too weak. 37498 trivial. 0 not checked. [2020-07-20 13:27:54,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1331745469] [2020-07-20 13:27:54,791 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:27:54,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:27:54,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246161079] [2020-07-20 13:27:54,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:27:54,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:27:54,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:27:54,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:27:54,793 INFO L87 Difference]: Start difference. First operand 248 states and 722 transitions. Second operand 21 states. [2020-07-20 13:27:55,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:27:55,961 INFO L93 Difference]: Finished difference Result 400 states and 1594 transitions. [2020-07-20 13:27:55,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:27:55,965 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1177 [2020-07-20 13:27:55,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:27:55,975 INFO L225 Difference]: With dead ends: 400 [2020-07-20 13:27:55,975 INFO L226 Difference]: Without dead ends: 383 [2020-07-20 13:27:55,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2361 GetRequests, 2317 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:27:55,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2020-07-20 13:27:56,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 238. [2020-07-20 13:27:56,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-20 13:27:56,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 653 transitions. [2020-07-20 13:27:56,029 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 653 transitions. Word has length 1177 [2020-07-20 13:27:56,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:27:56,030 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 653 transitions. [2020-07-20 13:27:56,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:27:56,030 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 653 transitions. [2020-07-20 13:27:56,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1201 [2020-07-20 13:27:56,051 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:27:56,052 INFO L422 BasicCegarLoop]: trace histogram [93, 93, 82, 82, 73, 70, 46, 46, 46, 46, 46, 46, 46, 41, 41, 41, 41, 41, 41, 41, 32, 24, 20, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:27:56,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:56,267 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:27:56,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:27:56,268 INFO L82 PathProgramCache]: Analyzing trace with hash -254149570, now seen corresponding path program 18 times [2020-07-20 13:27:56,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:27:56,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [880771379] [2020-07-20 13:27:56,269 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:57,457 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:27:57,457 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:27:57,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 2169 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:27:57,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:27:58,434 INFO L134 CoverageAnalysis]: Checked inductivity of 42859 backedges. 721 proven. 2541 refuted. 0 times theorem prover too weak. 39597 trivial. 0 not checked. [2020-07-20 13:27:58,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:28:11,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:11,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:13,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:13,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:15,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:15,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:15,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:16,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:16,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:16,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:17,034 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:28:17,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:18,913 INFO L134 CoverageAnalysis]: Checked inductivity of 42859 backedges. 721 proven. 2567 refuted. 0 times theorem prover too weak. 39571 trivial. 0 not checked. [2020-07-20 13:28:18,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [880771379] [2020-07-20 13:28:18,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:28:18,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:28:18,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844861708] [2020-07-20 13:28:18,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:28:18,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:28:18,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:28:18,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:28:18,916 INFO L87 Difference]: Start difference. First operand 238 states and 653 transitions. Second operand 19 states. [2020-07-20 13:28:19,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:28:19,953 INFO L93 Difference]: Finished difference Result 489 states and 2374 transitions. [2020-07-20 13:28:19,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:28:19,958 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1200 [2020-07-20 13:28:19,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:28:19,971 INFO L225 Difference]: With dead ends: 489 [2020-07-20 13:28:19,971 INFO L226 Difference]: Without dead ends: 472 [2020-07-20 13:28:19,978 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2406 GetRequests, 2367 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:28:19,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-20 13:28:20,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 240. [2020-07-20 13:28:20,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-20 13:28:20,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 667 transitions. [2020-07-20 13:28:20,047 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 667 transitions. Word has length 1200 [2020-07-20 13:28:20,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:28:20,048 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 667 transitions. [2020-07-20 13:28:20,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:28:20,048 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 667 transitions. [2020-07-20 13:28:20,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1651 [2020-07-20 13:28:20,075 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:28:20,076 INFO L422 BasicCegarLoop]: trace histogram [122, 122, 121, 121, 94, 91, 61, 61, 61, 61, 61, 61, 61, 60, 60, 60, 60, 60, 60, 60, 34, 30, 30, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:28:20,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:20,282 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:28:20,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:28:20,283 INFO L82 PathProgramCache]: Analyzing trace with hash -534250060, now seen corresponding path program 19 times [2020-07-20 13:28:20,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:28:20,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1556245587] [2020-07-20 13:28:20,284 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:21,579 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:28:21,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:28:21,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 2985 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:28:21,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:28:22,935 INFO L134 CoverageAnalysis]: Checked inductivity of 81430 backedges. 941 proven. 4145 refuted. 0 times theorem prover too weak. 76344 trivial. 0 not checked. [2020-07-20 13:28:22,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:28:26,235 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:28:26,342 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:28:44,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:51,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:53,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:54,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:54,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:54,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:55,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:55,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:55,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:55,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:55,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:57,975 INFO L134 CoverageAnalysis]: Checked inductivity of 81430 backedges. 941 proven. 4177 refuted. 0 times theorem prover too weak. 76312 trivial. 0 not checked. [2020-07-20 13:28:57,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1556245587] [2020-07-20 13:28:57,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:28:57,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:28:57,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79661544] [2020-07-20 13:28:57,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:28:57,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:28:57,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:28:57,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:28:57,978 INFO L87 Difference]: Start difference. First operand 240 states and 667 transitions. Second operand 21 states. [2020-07-20 13:28:59,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:28:59,137 INFO L93 Difference]: Finished difference Result 357 states and 1259 transitions. [2020-07-20 13:28:59,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:28:59,141 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1650 [2020-07-20 13:28:59,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:28:59,149 INFO L225 Difference]: With dead ends: 357 [2020-07-20 13:28:59,149 INFO L226 Difference]: Without dead ends: 340 [2020-07-20 13:28:59,153 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3307 GetRequests, 3263 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:28:59,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2020-07-20 13:28:59,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 226. [2020-07-20 13:28:59,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2020-07-20 13:28:59,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 608 transitions. [2020-07-20 13:28:59,197 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 608 transitions. Word has length 1650 [2020-07-20 13:28:59,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:28:59,198 INFO L479 AbstractCegarLoop]: Abstraction has 226 states and 608 transitions. [2020-07-20 13:28:59,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:28:59,198 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 608 transitions. [2020-07-20 13:28:59,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1169 [2020-07-20 13:28:59,216 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:28:59,217 INFO L422 BasicCegarLoop]: trace histogram [89, 89, 82, 82, 68, 67, 44, 44, 44, 44, 44, 44, 44, 41, 41, 41, 41, 41, 41, 41, 26, 24, 22, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:28:59,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:59,426 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:28:59,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:28:59,427 INFO L82 PathProgramCache]: Analyzing trace with hash -229689442, now seen corresponding path program 20 times [2020-07-20 13:28:59,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:28:59,428 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321736831] [2020-07-20 13:28:59,428 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:29:00,631 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:29:00,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:29:00,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 2111 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:29:00,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:29:01,375 INFO L134 CoverageAnalysis]: Checked inductivity of 40501 backedges. 950 proven. 3110 refuted. 0 times theorem prover too weak. 36441 trivial. 0 not checked. [2020-07-20 13:29:01,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:29:02,057 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 13:29:05,185 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:29:05,293 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:29:05,397 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:29:14,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:17,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:17,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:19,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:19,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:20,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:20,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:21,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:21,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:21,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:21,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:21,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:21,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:22,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:22,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:24,012 INFO L134 CoverageAnalysis]: Checked inductivity of 40501 backedges. 954 proven. 3152 refuted. 0 times theorem prover too weak. 36395 trivial. 0 not checked. [2020-07-20 13:29:24,013 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321736831] [2020-07-20 13:29:24,013 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:29:24,013 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:29:24,014 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312349312] [2020-07-20 13:29:24,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:29:24,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:29:24,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:29:24,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:29:24,015 INFO L87 Difference]: Start difference. First operand 226 states and 608 transitions. Second operand 23 states. [2020-07-20 13:29:25,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:29:25,402 INFO L93 Difference]: Finished difference Result 366 states and 1284 transitions. [2020-07-20 13:29:25,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:29:25,405 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1168 [2020-07-20 13:29:25,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:29:25,415 INFO L225 Difference]: With dead ends: 366 [2020-07-20 13:29:25,415 INFO L226 Difference]: Without dead ends: 323 [2020-07-20 13:29:25,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2344 GetRequests, 2295 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:29:25,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2020-07-20 13:29:25,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 222. [2020-07-20 13:29:25,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-20 13:29:25,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 594 transitions. [2020-07-20 13:29:25,462 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 594 transitions. Word has length 1168 [2020-07-20 13:29:25,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:29:25,462 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 594 transitions. [2020-07-20 13:29:25,463 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:29:25,463 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 594 transitions. [2020-07-20 13:29:25,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1136 [2020-07-20 13:29:25,483 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:29:25,484 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 79, 79, 67, 59, 44, 44, 44, 44, 44, 44, 44, 39, 39, 39, 39, 39, 39, 39, 28, 21, 20, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:29:25,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:29:25,699 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:29:25,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:29:25,700 INFO L82 PathProgramCache]: Analyzing trace with hash -1496433466, now seen corresponding path program 21 times [2020-07-20 13:29:25,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:29:25,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [112713874] [2020-07-20 13:29:25,701 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:29:27,217 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:29:27,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:29:27,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 2055 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:29:27,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:29:28,153 INFO L134 CoverageAnalysis]: Checked inductivity of 38306 backedges. 758 proven. 2225 refuted. 0 times theorem prover too weak. 35323 trivial. 0 not checked. [2020-07-20 13:29:28,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:29:38,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:38,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:41,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:41,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:43,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:43,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:44,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:44,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:44,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:44,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:44,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:44,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:44,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:45,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:47,018 INFO L134 CoverageAnalysis]: Checked inductivity of 38306 backedges. 758 proven. 2248 refuted. 0 times theorem prover too weak. 35300 trivial. 0 not checked. [2020-07-20 13:29:47,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [112713874] [2020-07-20 13:29:47,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:29:47,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:29:47,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291641533] [2020-07-20 13:29:47,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:29:47,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:29:47,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:29:47,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:29:47,020 INFO L87 Difference]: Start difference. First operand 222 states and 594 transitions. Second operand 19 states. [2020-07-20 13:29:48,067 WARN L193 SmtUtils]: Spent 907.00 ms on a formula simplification that was a NOOP. DAG size: 6 [2020-07-20 13:29:48,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:29:48,696 INFO L93 Difference]: Finished difference Result 384 states and 1447 transitions. [2020-07-20 13:29:48,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:29:48,699 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1135 [2020-07-20 13:29:48,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:29:48,707 INFO L225 Difference]: With dead ends: 384 [2020-07-20 13:29:48,707 INFO L226 Difference]: Without dead ends: 366 [2020-07-20 13:29:48,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2276 GetRequests, 2237 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:29:48,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2020-07-20 13:29:48,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 231. [2020-07-20 13:29:48,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2020-07-20 13:29:48,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 625 transitions. [2020-07-20 13:29:48,745 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 625 transitions. Word has length 1135 [2020-07-20 13:29:48,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:29:48,745 INFO L479 AbstractCegarLoop]: Abstraction has 231 states and 625 transitions. [2020-07-20 13:29:48,745 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:29:48,746 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 625 transitions. [2020-07-20 13:29:48,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1012 [2020-07-20 13:29:48,756 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:29:48,756 INFO L422 BasicCegarLoop]: trace histogram [74, 74, 73, 73, 62, 60, 37, 37, 37, 37, 37, 37, 37, 36, 36, 36, 36, 36, 36, 36, 25, 24, 14, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:29:48,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:29:48,957 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:29:48,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:29:48,958 INFO L82 PathProgramCache]: Analyzing trace with hash 711721822, now seen corresponding path program 22 times [2020-07-20 13:29:48,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:29:48,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301650837] [2020-07-20 13:29:48,959 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:29:50,164 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:29:50,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:29:50,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 1828 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:29:50,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:29:50,757 INFO L134 CoverageAnalysis]: Checked inductivity of 30161 backedges. 572 proven. 2905 refuted. 0 times theorem prover too weak. 26684 trivial. 0 not checked. [2020-07-20 13:29:50,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:29:54,064 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:29:54,170 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:29:54,280 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:29:54,386 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:30:02,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:02,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:03,033 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:30:05,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:05,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:08,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:10,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:11,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:12,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:12,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:12,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:12,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:12,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:12,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:13,238 INFO L134 CoverageAnalysis]: Checked inductivity of 30161 backedges. 584 proven. 2937 refuted. 0 times theorem prover too weak. 26640 trivial. 0 not checked. [2020-07-20 13:30:13,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301650837] [2020-07-20 13:30:13,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:30:13,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:30:13,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334668764] [2020-07-20 13:30:13,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:30:13,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:30:13,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:30:13,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:30:13,243 INFO L87 Difference]: Start difference. First operand 231 states and 625 transitions. Second operand 23 states. [2020-07-20 13:30:14,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:30:14,962 INFO L93 Difference]: Finished difference Result 608 states and 3062 transitions. [2020-07-20 13:30:14,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:30:14,966 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1011 [2020-07-20 13:30:14,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:30:14,978 INFO L225 Difference]: With dead ends: 608 [2020-07-20 13:30:14,978 INFO L226 Difference]: Without dead ends: 368 [2020-07-20 13:30:14,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2030 GetRequests, 1981 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:30:14,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2020-07-20 13:30:15,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 225. [2020-07-20 13:30:15,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2020-07-20 13:30:15,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 603 transitions. [2020-07-20 13:30:15,024 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 603 transitions. Word has length 1011 [2020-07-20 13:30:15,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:30:15,025 INFO L479 AbstractCegarLoop]: Abstraction has 225 states and 603 transitions. [2020-07-20 13:30:15,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:30:15,025 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 603 transitions. [2020-07-20 13:30:15,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1292 [2020-07-20 13:30:15,044 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:30:15,044 INFO L422 BasicCegarLoop]: trace histogram [96, 96, 93, 93, 77, 73, 48, 48, 48, 48, 48, 48, 48, 46, 46, 46, 46, 46, 46, 46, 31, 25, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:30:15,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:30:15,245 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:30:15,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:30:15,247 INFO L82 PathProgramCache]: Analyzing trace with hash 1846977457, now seen corresponding path program 23 times [2020-07-20 13:30:15,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:30:15,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [975945564] [2020-07-20 13:30:15,248 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:30:16,731 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:30:16,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:30:16,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 2334 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:30:16,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:30:17,967 INFO L134 CoverageAnalysis]: Checked inductivity of 49558 backedges. 1058 proven. 3442 refuted. 0 times theorem prover too weak. 45058 trivial. 0 not checked. [2020-07-20 13:30:17,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:30:20,918 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:30:21,024 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:30:22,415 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:30:22,522 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:30:22,641 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:30:22,759 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:30:22,872 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:30:22,975 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:30:34,257 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:30:34,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:39,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:39,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:42,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:42,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:43,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:43,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:44,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:44,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:45,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:45,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:45,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:45,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:45,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:46,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:46,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:48,749 INFO L134 CoverageAnalysis]: Checked inductivity of 49558 backedges. 1064 proven. 3480 refuted. 0 times theorem prover too weak. 45014 trivial. 0 not checked. [2020-07-20 13:30:48,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [975945564] [2020-07-20 13:30:48,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:30:48,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:30:48,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338236625] [2020-07-20 13:30:48,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:30:48,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:30:48,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:30:48,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:30:48,753 INFO L87 Difference]: Start difference. First operand 225 states and 603 transitions. Second operand 23 states. [2020-07-20 13:30:50,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:30:50,691 INFO L93 Difference]: Finished difference Result 317 states and 959 transitions. [2020-07-20 13:30:50,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:30:50,697 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1291 [2020-07-20 13:30:50,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:30:50,703 INFO L225 Difference]: With dead ends: 317 [2020-07-20 13:30:50,703 INFO L226 Difference]: Without dead ends: 274 [2020-07-20 13:30:50,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2590 GetRequests, 2541 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:30:50,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-20 13:30:50,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 238. [2020-07-20 13:30:50,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-20 13:30:50,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 691 transitions. [2020-07-20 13:30:50,743 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 691 transitions. Word has length 1291 [2020-07-20 13:30:50,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:30:50,744 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 691 transitions. [2020-07-20 13:30:50,744 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:30:50,744 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 691 transitions. [2020-07-20 13:30:50,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1173 [2020-07-20 13:30:50,764 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:30:50,765 INFO L422 BasicCegarLoop]: trace histogram [86, 86, 85, 85, 70, 69, 43, 43, 43, 43, 43, 43, 43, 42, 42, 42, 42, 42, 42, 42, 28, 26, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:30:50,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:30:50,978 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:30:50,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:30:50,978 INFO L82 PathProgramCache]: Analyzing trace with hash 136462430, now seen corresponding path program 24 times [2020-07-20 13:30:50,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:30:50,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [480043547] [2020-07-20 13:30:50,979 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 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:30:52,301 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:30:52,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:30:52,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 2117 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:30:52,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:30:53,061 INFO L134 CoverageAnalysis]: Checked inductivity of 40717 backedges. 828 proven. 2732 refuted. 0 times theorem prover too weak. 37157 trivial. 0 not checked. [2020-07-20 13:30:53,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:30:57,633 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:30:57,744 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:30:57,863 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:30:57,979 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:30:58,093 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:31:11,460 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:31:12,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:16,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:16,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:20,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:21,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:21,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:22,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:22,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:22,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:22,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:23,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:25,825 INFO L134 CoverageAnalysis]: Checked inductivity of 40717 backedges. 832 proven. 2758 refuted. 0 times theorem prover too weak. 37127 trivial. 0 not checked. [2020-07-20 13:31:25,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [480043547] [2020-07-20 13:31:25,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:31:25,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:31:25,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353139560] [2020-07-20 13:31:25,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:31:25,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:31:25,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:31:25,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:31:25,828 INFO L87 Difference]: Start difference. First operand 238 states and 691 transitions. Second operand 21 states. [2020-07-20 13:31:27,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:31:27,280 INFO L93 Difference]: Finished difference Result 327 states and 1050 transitions. [2020-07-20 13:31:27,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:31:27,287 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1172 [2020-07-20 13:31:27,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:31:27,293 INFO L225 Difference]: With dead ends: 327 [2020-07-20 13:31:27,293 INFO L226 Difference]: Without dead ends: 304 [2020-07-20 13:31:27,295 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2351 GetRequests, 2307 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:31:27,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-07-20 13:31:27,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 229. [2020-07-20 13:31:27,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2020-07-20 13:31:27,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 613 transitions. [2020-07-20 13:31:27,334 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 613 transitions. Word has length 1172 [2020-07-20 13:31:27,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:31:27,334 INFO L479 AbstractCegarLoop]: Abstraction has 229 states and 613 transitions. [2020-07-20 13:31:27,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:31:27,334 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 613 transitions. [2020-07-20 13:31:27,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1145 [2020-07-20 13:31:27,346 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:31:27,346 INFO L422 BasicCegarLoop]: trace histogram [86, 86, 81, 81, 69, 66, 43, 43, 43, 43, 43, 43, 43, 40, 40, 40, 40, 40, 40, 40, 26, 26, 20, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:31:27,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:31:27,547 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:31:27,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:31:27,548 INFO L82 PathProgramCache]: Analyzing trace with hash 530548978, now seen corresponding path program 25 times [2020-07-20 13:31:27,549 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:31:27,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1338121255] [2020-07-20 13:31:27,549 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 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:31:28,898 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:31:28,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:31:28,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 2068 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:31:28,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:31:29,804 INFO L134 CoverageAnalysis]: Checked inductivity of 38803 backedges. 1080 proven. 2455 refuted. 0 times theorem prover too weak. 35268 trivial. 0 not checked. [2020-07-20 13:31:29,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:31:33,773 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:31:33,883 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:31:35,164 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:31:35,281 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:31:35,400 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:31:35,520 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:31:35,643 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:31:35,757 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:31:45,924 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:31:46,028 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:31:46,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:52,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:52,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:53,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:54,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:54,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:55,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:55,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:55,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:56,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:56,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:57,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:00,971 INFO L134 CoverageAnalysis]: Checked inductivity of 38803 backedges. 1084 proven. 2484 refuted. 0 times theorem prover too weak. 35235 trivial. 0 not checked. [2020-07-20 13:32:00,971 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1338121255] [2020-07-20 13:32:00,971 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:32:00,972 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:32:00,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988043497] [2020-07-20 13:32:00,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:32:00,973 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:32:00,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:32:00,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:32:00,974 INFO L87 Difference]: Start difference. First operand 229 states and 613 transitions. Second operand 21 states. [2020-07-20 13:32:02,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:32:02,513 INFO L93 Difference]: Finished difference Result 360 states and 1282 transitions. [2020-07-20 13:32:02,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:32:02,520 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1144 [2020-07-20 13:32:02,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:32:02,528 INFO L225 Difference]: With dead ends: 360 [2020-07-20 13:32:02,529 INFO L226 Difference]: Without dead ends: 351 [2020-07-20 13:32:02,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2295 GetRequests, 2251 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:32:02,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-20 13:32:02,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 278. [2020-07-20 13:32:02,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 278 states. [2020-07-20 13:32:02,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 889 transitions. [2020-07-20 13:32:02,582 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 889 transitions. Word has length 1144 [2020-07-20 13:32:02,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:32:02,583 INFO L479 AbstractCegarLoop]: Abstraction has 278 states and 889 transitions. [2020-07-20 13:32:02,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:32:02,583 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 889 transitions. [2020-07-20 13:32:02,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1461 [2020-07-20 13:32:02,618 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:32:02,619 INFO L422 BasicCegarLoop]: trace histogram [117, 117, 100, 100, 79, 72, 58, 58, 58, 58, 58, 58, 58, 50, 50, 50, 50, 50, 50, 50, 45, 22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:32:02,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:32:02,834 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:32:02,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:32:02,834 INFO L82 PathProgramCache]: Analyzing trace with hash -331302715, now seen corresponding path program 26 times [2020-07-20 13:32:02,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:32:02,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574857658] [2020-07-20 13:32:02,835 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:32:04,293 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:32:04,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:32:04,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 2643 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:32:04,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:32:05,571 INFO L134 CoverageAnalysis]: Checked inductivity of 64093 backedges. 1365 proven. 3707 refuted. 0 times theorem prover too weak. 59021 trivial. 0 not checked. [2020-07-20 13:32:05,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:32:08,524 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:32:08,630 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:32:08,744 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:32:08,860 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:32:10,787 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:32:10,928 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:32:11,081 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:32:11,225 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:32:13,329 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:32:13,489 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:32:13,661 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:32:13,830 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:32:13,995 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:32:14,149 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:32:14,293 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:32:14,425 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 13:32:14,547 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:32:28,020 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 13:32:28,130 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 13:32:28,249 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 13:32:28,367 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 13:32:28,494 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:32:28,622 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:32:28,761 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:32:28,897 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:32:30,806 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:32:30,932 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:32:31,071 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:32:31,203 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:32:31,327 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 13:32:31,444 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:32:31,554 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:32:31,658 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:32:32,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:32,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:43,678 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:32:43,784 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:32:43,899 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:32:44,014 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:32:44,123 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:32:44,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:46,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:46,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:49,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:49,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:50,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:50,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:50,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:51,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:51,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:51,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:52,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:57,762 INFO L134 CoverageAnalysis]: Checked inductivity of 64093 backedges. 1369 proven. 3743 refuted. 0 times theorem prover too weak. 58981 trivial. 0 not checked. [2020-07-20 13:32:57,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574857658] [2020-07-20 13:32:57,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:32:57,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 13:32:57,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251521975] [2020-07-20 13:32:57,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:32:57,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:32:57,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:32:57,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:32:57,765 INFO L87 Difference]: Start difference. First operand 278 states and 889 transitions. Second operand 23 states. [2020-07-20 13:32:59,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:32:59,609 INFO L93 Difference]: Finished difference Result 368 states and 1350 transitions. [2020-07-20 13:32:59,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:32:59,617 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1460 [2020-07-20 13:32:59,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:32:59,625 INFO L225 Difference]: With dead ends: 368 [2020-07-20 13:32:59,625 INFO L226 Difference]: Without dead ends: 359 [2020-07-20 13:32:59,628 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2928 GetRequests, 2879 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:32:59,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2020-07-20 13:32:59,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 274. [2020-07-20 13:32:59,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2020-07-20 13:32:59,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 834 transitions. [2020-07-20 13:32:59,666 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 834 transitions. Word has length 1460 [2020-07-20 13:32:59,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:32:59,667 INFO L479 AbstractCegarLoop]: Abstraction has 274 states and 834 transitions. [2020-07-20 13:32:59,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:32:59,667 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 834 transitions. [2020-07-20 13:32:59,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1208 [2020-07-20 13:32:59,681 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:32:59,681 INFO L422 BasicCegarLoop]: trace histogram [89, 89, 88, 88, 70, 68, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 26, 24, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:32:59,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:32:59,883 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:32:59,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:32:59,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1122699091, now seen corresponding path program 27 times [2020-07-20 13:32:59,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:32:59,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [382919241] [2020-07-20 13:32:59,885 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:33:01,398 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:33:01,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:33:01,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 2184 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:33:01,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:33:02,356 INFO L134 CoverageAnalysis]: Checked inductivity of 43237 backedges. 1142 proven. 2526 refuted. 0 times theorem prover too weak. 39569 trivial. 0 not checked. [2020-07-20 13:33:02,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:33:05,269 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 13:33:05,373 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 13:33:07,022 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:33:07,136 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:33:07,258 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:33:07,377 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:33:08,492 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:33:08,621 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:33:08,757 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:33:08,895 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:33:09,026 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:33:09,148 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:33:09,261 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:33:09,368 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:33:17,400 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 13:33:17,510 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 13:33:19,213 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:33:19,328 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:33:19,451 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:33:19,573 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:33:19,687 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:33:19,795 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 13:33:20,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:31,133 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 13:33:31,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:33,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:35,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:35,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:36,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:36,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:36,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:36,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:37,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:37,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:37,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:38,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:42,352 INFO L134 CoverageAnalysis]: Checked inductivity of 43237 backedges. 1144 proven. 2556 refuted. 0 times theorem prover too weak. 39537 trivial. 0 not checked. [2020-07-20 13:33:42,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [382919241] [2020-07-20 13:33:42,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:33:42,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:33:42,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875033947] [2020-07-20 13:33:42,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:33:42,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:33:42,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:33:42,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:33:42,355 INFO L87 Difference]: Start difference. First operand 274 states and 834 transitions. Second operand 21 states. [2020-07-20 13:33:44,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:33:44,020 INFO L93 Difference]: Finished difference Result 433 states and 1767 transitions. [2020-07-20 13:33:44,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:33:44,027 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1207 [2020-07-20 13:33:44,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:33:44,043 INFO L225 Difference]: With dead ends: 433 [2020-07-20 13:33:44,043 INFO L226 Difference]: Without dead ends: 424 [2020-07-20 13:33:44,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2421 GetRequests, 2377 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:33:44,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2020-07-20 13:33:44,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 261. [2020-07-20 13:33:44,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 261 states. [2020-07-20 13:33:44,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 755 transitions. [2020-07-20 13:33:44,094 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 755 transitions. Word has length 1207 [2020-07-20 13:33:44,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:33:44,095 INFO L479 AbstractCegarLoop]: Abstraction has 261 states and 755 transitions. [2020-07-20 13:33:44,095 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:33:44,095 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 755 transitions. [2020-07-20 13:33:44,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1022 [2020-07-20 13:33:44,113 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:33:44,113 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 74, 74, 61, 59, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 24, 22, 16, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:33:44,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:33:44,328 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:33:44,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:33:44,330 INFO L82 PathProgramCache]: Analyzing trace with hash 113694921, now seen corresponding path program 28 times [2020-07-20 13:33:44,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:33:44,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2112915266] [2020-07-20 13:33:44,331 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:33:45,919 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:33:45,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:33:45,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 1850 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:33:45,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:33:46,783 INFO L134 CoverageAnalysis]: Checked inductivity of 30773 backedges. 991 proven. 1746 refuted. 0 times theorem prover too weak. 28036 trivial. 0 not checked. [2020-07-20 13:33:46,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:33:51,152 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:33:51,260 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:33:51,377 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 13:33:51,491 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 13:33:51,605 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:33:59,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:59,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:03,979 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 13:34:05,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:05,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:06,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:06,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:08,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:08,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:09,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:09,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:09,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:09,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:10,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:11,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:14,654 INFO L134 CoverageAnalysis]: Checked inductivity of 30773 backedges. 993 proven. 1768 refuted. 0 times theorem prover too weak. 28012 trivial. 0 not checked. [2020-07-20 13:34:14,655 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2112915266] [2020-07-20 13:34:14,655 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:14,655 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:34:14,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415322345] [2020-07-20 13:34:14,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:34:14,656 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:14,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:34:14,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:34:14,657 INFO L87 Difference]: Start difference. First operand 261 states and 755 transitions. Second operand 19 states. [2020-07-20 13:34:16,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:16,123 INFO L93 Difference]: Finished difference Result 502 states and 2319 transitions. [2020-07-20 13:34:16,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:34:16,130 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1021 [2020-07-20 13:34:16,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:16,146 INFO L225 Difference]: With dead ends: 502 [2020-07-20 13:34:16,146 INFO L226 Difference]: Without dead ends: 493 [2020-07-20 13:34:16,150 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2048 GetRequests, 2009 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:34:16,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 493 states. [2020-07-20 13:34:16,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 493 to 263. [2020-07-20 13:34:16,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 263 states. [2020-07-20 13:34:16,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 773 transitions. [2020-07-20 13:34:16,217 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 773 transitions. Word has length 1021 [2020-07-20 13:34:16,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:16,218 INFO L479 AbstractCegarLoop]: Abstraction has 263 states and 773 transitions. [2020-07-20 13:34:16,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:34:16,218 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 773 transitions. [2020-07-20 13:34:16,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1647 [2020-07-20 13:34:16,247 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:16,247 INFO L422 BasicCegarLoop]: trace histogram [125, 125, 116, 116, 97, 96, 62, 62, 62, 62, 62, 62, 62, 58, 58, 58, 58, 58, 58, 58, 38, 35, 29, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:16,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:16,449 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:16,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:16,450 INFO L82 PathProgramCache]: Analyzing trace with hash -1307008481, now seen corresponding path program 29 times [2020-07-20 13:34:16,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:16,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1484398265] [2020-07-20 13:34:16,451 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:18,230 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:18,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:18,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 2975 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:34:18,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:20,211 INFO L134 CoverageAnalysis]: Checked inductivity of 81072 backedges. 1413 proven. 4416 refuted. 0 times theorem prover too weak. 75243 trivial. 0 not checked. [2020-07-20 13:34:20,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:22,628 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 13:34:22,731 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 13:34:22,846 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:34:22,957 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:34:23,081 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:34:23,202 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 13:34:24,644 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:34:24,773 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:34:24,915 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:34:25,056 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:34:27,549 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:34:27,697 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:34:27,854 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:34:28,000 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:34:28,121 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:34:28,225 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:34:43,908 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:34:44,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:52,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:52,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:54,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:55,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:55,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,428 INFO L134 CoverageAnalysis]: Checked inductivity of 81072 backedges. 1423 proven. 4452 refuted. 0 times theorem prover too weak. 75197 trivial. 0 not checked. [2020-07-20 13:35:02,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1484398265] [2020-07-20 13:35:02,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:02,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-20 13:35:02,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906036807] [2020-07-20 13:35:02,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:35:02,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:02,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:35:02,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:35:02,431 INFO L87 Difference]: Start difference. First operand 263 states and 773 transitions. Second operand 24 states.