/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_15-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:21:07,533 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:21:07,535 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:21:07,548 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:21:07,548 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:21:07,550 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:21:07,551 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:21:07,553 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:21:07,555 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:21:07,555 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:21:07,556 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:21:07,558 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:21:07,558 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:21:07,559 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:21:07,560 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:21:07,561 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:21:07,562 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:21:07,563 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:21:07,565 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:21:07,567 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:21:07,568 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:21:07,569 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:21:07,571 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:21:07,571 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:21:07,574 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:21:07,583 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:21:07,583 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:21:07,584 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:21:07,585 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 13:21:07,600 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:21:07,600 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:21:07,602 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:21:07,602 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:21:07,602 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:21:07,602 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:21:07,603 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:21:07,603 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:21:07,603 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:21:07,603 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:21:07,603 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:21:07,603 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:21:07,604 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:21:07,604 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:21:07,604 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:21:07,604 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:21:07,605 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:21:07,605 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:21:07,605 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:21:07,605 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:21:07,605 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:21:07,606 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:21:07,606 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:21:07,606 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:21:07,606 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:21:07,606 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:21:07,607 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:07,607 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:21:07,607 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:21:07,607 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 13:21:07,910 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:21:07,925 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:21:07,930 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:21:07,932 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:21:07,932 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:21:07,934 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-20 13:21:08,007 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c691aecf2/9fd1e717d8d04d27955ef881d7dbcf03/FLAG690d13b1a [2020-07-20 13:21:08,400 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:21:08,400 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-20 13:21:08,405 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c691aecf2/9fd1e717d8d04d27955ef881d7dbcf03/FLAG690d13b1a [2020-07-20 13:21:08,795 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c691aecf2/9fd1e717d8d04d27955ef881d7dbcf03 [2020-07-20 13:21:08,805 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:21:08,807 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:21:08,812 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:08,813 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:21:08,818 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:21:08,819 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:08" (1/1) ... [2020-07-20 13:21:08,822 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@416ba85b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:08, skipping insertion in model container [2020-07-20 13:21:08,822 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:08" (1/1) ... [2020-07-20 13:21:08,832 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:21:08,847 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:21:08,994 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:08,999 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:21:09,016 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:09,031 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:21:09,031 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:09 WrapperNode [2020-07-20 13:21:09,031 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:09,032 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:21:09,032 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:21:09,033 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:21:09,048 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:09" (1/1) ... [2020-07-20 13:21:09,048 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:09" (1/1) ... [2020-07-20 13:21:09,054 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:09" (1/1) ... [2020-07-20 13:21:09,054 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:09" (1/1) ... [2020-07-20 13:21:09,058 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:09" (1/1) ... [2020-07-20 13:21:09,060 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:09" (1/1) ... [2020-07-20 13:21:09,061 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:09" (1/1) ... [2020-07-20 13:21:09,063 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:21:09,064 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:21:09,064 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:21:09,064 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:21:09,065 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:09" (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 13:21:09,245 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:21:09,245 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:21:09,246 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 13:21:09,246 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:21:09,246 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:21:09,247 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:21:09,247 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 13:21:09,247 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:21:09,248 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:21:09,248 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:21:09,487 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:21:09,487 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:21:09,492 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:09 BoogieIcfgContainer [2020-07-20 13:21:09,492 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:21:09,493 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:21:09,493 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:21:09,497 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:21:09,498 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:21:08" (1/3) ... [2020-07-20 13:21:09,499 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22aa1d53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:09, skipping insertion in model container [2020-07-20 13:21:09,499 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:09" (2/3) ... [2020-07-20 13:21:09,500 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22aa1d53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:09, skipping insertion in model container [2020-07-20 13:21:09,500 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:09" (3/3) ... [2020-07-20 13:21:09,502 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_15-1.c [2020-07-20 13:21:09,514 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:21:09,523 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:21:09,543 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:21:09,573 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:21:09,573 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:21:09,573 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:21:09,574 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:21:09,574 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:21:09,574 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:21:09,574 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:21:09,574 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:21:09,597 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 13:21:09,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:21:09,608 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:09,609 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:09,609 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:09,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:09,629 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 13:21:09,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:09,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [504314566] [2020-07-20 13:21:09,649 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 13:21:09,722 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:09,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:09,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:21:09,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:09,827 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 13:21:09,828 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:09,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [504314566] [2020-07-20 13:21:09,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:09,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:21:09,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630030243] [2020-07-20 13:21:09,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:21:09,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:09,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:21:09,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:21:09,854 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 13:21:09,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:09,969 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 13:21:09,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:21:09,972 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:21:09,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:09,983 INFO L225 Difference]: With dead ends: 35 [2020-07-20 13:21:09,983 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 13:21:09,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:21:10,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 13:21:10,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 13:21:10,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:21:10,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:21:10,038 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 13:21:10,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:10,038 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:21:10,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:21:10,038 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:21:10,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:21:10,040 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:10,040 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:10,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:10,247 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:10,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:10,248 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 13:21:10,249 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:10,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638296451] [2020-07-20 13:21:10,250 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:21:10,278 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:10,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:10,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:21:10,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:10,310 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 13:21:10,310 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:10,311 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638296451] [2020-07-20 13:21:10,312 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:10,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:21:10,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729619586] [2020-07-20 13:21:10,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:21:10,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:10,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:21:10,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:21:10,320 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 13:21:10,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:10,489 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 13:21:10,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:21:10,490 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 13:21:10,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:10,492 INFO L225 Difference]: With dead ends: 27 [2020-07-20 13:21:10,492 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 13:21:10,493 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 13:21:10,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 13:21:10,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 13:21:10,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:21:10,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:21:10,502 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 13:21:10,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:10,508 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:21:10,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:21:10,508 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:21:10,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:21:10,511 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:10,512 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:10,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:10,728 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:10,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:10,729 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 13:21:10,730 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:10,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [308468104] [2020-07-20 13:21:10,731 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 13:21:10,765 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:10,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:10,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:10,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:10,826 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:21:10,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:11,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:11,057 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:21:11,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [308468104] [2020-07-20 13:21:11,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:11,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:21:11,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147377321] [2020-07-20 13:21:11,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:21:11,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:11,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:21:11,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:21:11,061 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 13:21:11,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:11,169 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 13:21:11,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:21:11,170 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 13:21:11,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:11,172 INFO L225 Difference]: With dead ends: 32 [2020-07-20 13:21:11,172 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 13:21:11,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:11,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 13:21:11,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 13:21:11,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:21:11,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 13:21:11,183 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 13:21:11,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:11,184 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 13:21:11,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:21:11,184 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 13:21:11,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:21:11,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:11,186 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:11,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:11,400 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:11,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:11,401 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 13:21:11,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:11,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [222334471] [2020-07-20 13:21:11,402 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 13:21:11,431 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:11,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:11,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:11,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:11,472 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 13:21:11,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:11,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:11,630 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:21:11,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [222334471] [2020-07-20 13:21:11,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:11,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:21:11,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14241497] [2020-07-20 13:21:11,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:21:11,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:11,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:21:11,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:21:11,633 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 13:21:11,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:11,711 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 13:21:11,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:21:11,712 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 13:21:11,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:11,714 INFO L225 Difference]: With dead ends: 37 [2020-07-20 13:21:11,715 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 13:21:11,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:11,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 13:21:11,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 13:21:11,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:21:11,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 13:21:11,725 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 13:21:11,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:11,726 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 13:21:11,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:21:11,726 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 13:21:11,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 13:21:11,728 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:11,728 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:11,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:11,943 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:11,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:11,944 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 13:21:11,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:11,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1543780262] [2020-07-20 13:21:11,945 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:21:11,985 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:11,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:11,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:21:11,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:12,028 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 13:21:12,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:12,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:12,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:12,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:12,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:12,351 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:21:12,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1543780262] [2020-07-20 13:21:12,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:12,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:21:12,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635120675] [2020-07-20 13:21:12,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:21:12,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:12,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:21:12,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:12,354 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 13:21:12,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:12,522 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 13:21:12,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:12,523 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 13:21:12,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:12,525 INFO L225 Difference]: With dead ends: 42 [2020-07-20 13:21:12,525 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 13:21:12,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:21:12,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 13:21:12,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 13:21:12,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:21:12,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:21:12,536 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 13:21:12,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:12,537 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:21:12,537 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:21:12,537 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:21:12,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 13:21:12,539 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:12,539 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:12,742 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:12,743 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:12,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:12,744 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 13:21:12,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:12,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1132832099] [2020-07-20 13:21:12,746 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 13:21:12,790 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:12,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:12,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:21:12,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:12,831 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 13:21:12,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:13,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:13,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:13,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:13,145 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:21:13,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1132832099] [2020-07-20 13:21:13,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:13,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:21:13,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562997390] [2020-07-20 13:21:13,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:21:13,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:13,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:21:13,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:13,148 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 13:21:13,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:13,278 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 13:21:13,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:13,279 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 13:21:13,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:13,281 INFO L225 Difference]: With dead ends: 47 [2020-07-20 13:21:13,281 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 13:21:13,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:21:13,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 13:21:13,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 13:21:13,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:21:13,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:21:13,309 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 13:21:13,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:13,310 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:21:13,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:21:13,310 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:21:13,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 13:21:13,317 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:13,317 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:13,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:13,519 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:13,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:13,520 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 13:21:13,520 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:13,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530104277] [2020-07-20 13:21:13,521 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 13:21:13,561 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:13,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:13,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:21:13,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:13,621 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 13:21:13,622 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:14,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:14,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:14,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:14,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:14,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:14,210 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 13:21:14,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530104277] [2020-07-20 13:21:14,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:14,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 13:21:14,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604697520] [2020-07-20 13:21:14,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:21:14,212 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:14,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:21:14,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:21:14,212 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 13:21:14,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:14,394 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 13:21:14,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:21:14,395 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 13:21:14,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:14,400 INFO L225 Difference]: With dead ends: 52 [2020-07-20 13:21:14,401 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 13:21:14,402 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:14,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 13:21:14,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 13:21:14,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:21:14,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:21:14,430 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 13:21:14,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:14,435 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:21:14,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:21:14,435 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:21:14,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 13:21:14,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:14,441 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:14,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:14,642 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:14,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:14,642 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 13:21:14,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:14,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563293419] [2020-07-20 13:21:14,644 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 13:21:14,699 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:14,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:14,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:21:14,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:14,782 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 13:21:14,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:15,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:15,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:15,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:15,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:15,389 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 13:21:15,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563293419] [2020-07-20 13:21:15,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:15,390 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 13:21:15,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606331672] [2020-07-20 13:21:15,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:21:15,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:15,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:21:15,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:21:15,395 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 13:21:15,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:15,533 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 13:21:15,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:21:15,535 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 13:21:15,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:15,537 INFO L225 Difference]: With dead ends: 57 [2020-07-20 13:21:15,538 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 13:21:15,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:15,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 13:21:15,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 13:21:15,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:21:15,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:21:15,551 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 13:21:15,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:15,552 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:21:15,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:21:15,552 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:21:15,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 13:21:15,554 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:15,555 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:15,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:15,769 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:15,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:15,770 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 13:21:15,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:15,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1804557366] [2020-07-20 13:21:15,771 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 13:21:15,846 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:15,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:15,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:21:15,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:15,937 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 13:21:15,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:16,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,889 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 13:21:16,889 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1804557366] [2020-07-20 13:21:16,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:16,890 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 13:21:16,890 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827999608] [2020-07-20 13:21:16,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:21:16,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:16,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:21:16,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:21:16,893 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 13:21:17,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:17,179 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 13:21:17,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:21:17,179 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 13:21:17,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:17,183 INFO L225 Difference]: With dead ends: 62 [2020-07-20 13:21:17,183 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 13:21:17,184 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:21:17,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 13:21:17,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 13:21:17,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 13:21:17,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 13:21:17,196 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 13:21:17,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:17,196 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 13:21:17,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:21:17,197 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 13:21:17,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 13:21:17,200 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:17,200 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:17,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:17,415 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:17,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:17,416 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 13:21:17,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:17,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1048411882] [2020-07-20 13:21:17,417 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 13:21:17,504 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:17,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:17,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:21:17,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:17,616 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 13:21:17,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:18,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,723 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 13:21:18,723 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1048411882] [2020-07-20 13:21:18,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:18,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 13:21:18,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548183707] [2020-07-20 13:21:18,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:21:18,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:18,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:21:18,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:21:18,726 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 13:21:18,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:18,891 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 13:21:18,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:21:18,891 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 13:21:18,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:18,894 INFO L225 Difference]: With dead ends: 67 [2020-07-20 13:21:18,894 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 13:21:18,895 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:21:18,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 13:21:18,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 13:21:18,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 13:21:18,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 13:21:18,905 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 13:21:18,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:18,906 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 13:21:18,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:21:18,906 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 13:21:18,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 13:21:18,910 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:18,910 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:19,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:19,115 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:19,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:19,116 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 13:21:19,116 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:19,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1848896553] [2020-07-20 13:21:19,117 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:21:19,230 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:19,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:19,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 524 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:21:19,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:19,344 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 13:21:19,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:20,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:20,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:20,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,237 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 13:21:21,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1848896553] [2020-07-20 13:21:21,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:21,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 13:21:21,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082881860] [2020-07-20 13:21:21,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:21:21,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:21,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:21:21,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:21,242 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 13:21:21,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:21,455 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 13:21:21,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:21:21,456 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 13:21:21,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:21,462 INFO L225 Difference]: With dead ends: 72 [2020-07-20 13:21:21,462 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 13:21:21,463 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:21:21,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 13:21:21,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 13:21:21,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 13:21:21,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 13:21:21,486 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 13:21:21,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:21,487 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 13:21:21,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:21:21,487 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 13:21:21,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-20 13:21:21,494 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:21,494 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:21,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:21,709 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:21,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:21,709 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-20 13:21:21,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:21,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1620218969] [2020-07-20 13:21:21,710 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 13:21:21,836 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:21,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:21,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:21:21,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:22,003 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-20 13:21:22,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:23,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,874 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-20 13:21:23,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1620218969] [2020-07-20 13:21:23,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:23,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 13:21:23,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327263761] [2020-07-20 13:21:23,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:21:23,877 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:23,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:21:23,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:23,877 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 13:21:24,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:24,118 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 13:21:24,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:21:24,119 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-20 13:21:24,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:24,127 INFO L225 Difference]: With dead ends: 77 [2020-07-20 13:21:24,127 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 13:21:24,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:21:24,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 13:21:24,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 13:21:24,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 13:21:24,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 13:21:24,154 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-20 13:21:24,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:24,156 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 13:21:24,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:21:24,157 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 13:21:24,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-20 13:21:24,168 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:24,168 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:24,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:24,378 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:24,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:24,379 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-20 13:21:24,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:24,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541672663] [2020-07-20 13:21:24,380 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 13:21:24,568 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:24,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:24,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 851 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:21:24,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:24,810 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-20 13:21:24,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:26,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,943 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-20 13:21:27,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541672663] [2020-07-20 13:21:27,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:27,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 13:21:27,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040083986] [2020-07-20 13:21:27,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:21:27,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:27,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:21:27,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:21:27,945 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 13:21:28,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:28,268 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 13:21:28,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:21:28,269 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-20 13:21:28,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:28,273 INFO L225 Difference]: With dead ends: 82 [2020-07-20 13:21:28,274 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 13:21:28,275 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:21:28,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 13:21:28,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 13:21:28,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 13:21:28,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 13:21:28,287 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-20 13:21:28,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:28,288 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 13:21:28,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:21:28,288 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 13:21:28,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 13:21:28,292 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:28,292 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:28,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:28,506 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:28,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:28,507 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 13:21:28,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:28,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [214951925] [2020-07-20 13:21:28,508 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 13:21:28,686 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:28,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:28,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 817 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:21:28,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:28,880 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 13:21:28,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:30,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,894 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 13:21:31,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [214951925] [2020-07-20 13:21:31,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:31,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 13:21:31,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450542591] [2020-07-20 13:21:31,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:21:31,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:31,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:21:31,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:21:31,897 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 13:21:32,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:32,326 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 13:21:32,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:21:32,328 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 13:21:32,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:32,334 INFO L225 Difference]: With dead ends: 87 [2020-07-20 13:21:32,334 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 13:21:32,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:21:32,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 13:21:32,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 13:21:32,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 13:21:32,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 13:21:32,363 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 13:21:32,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:32,365 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 13:21:32,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:21:32,365 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 13:21:32,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-20 13:21:32,377 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:32,378 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:32,591 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:32,592 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:32,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:32,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-20 13:21:32,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:32,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1128444824] [2020-07-20 13:21:32,594 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 13:21:32,966 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:32,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:32,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 1585 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:21:32,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:33,349 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-20 13:21:33,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:36,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:36,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:37,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:38,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:39,004 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-20 13:21:39,005 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1128444824] [2020-07-20 13:21:39,005 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:39,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 13:21:39,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606267383] [2020-07-20 13:21:39,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:21:39,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:39,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:21:39,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:21:39,008 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 13:21:39,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:39,397 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 13:21:39,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:21:39,398 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-20 13:21:39,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:39,403 INFO L225 Difference]: With dead ends: 92 [2020-07-20 13:21:39,403 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 13:21:39,404 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:21:39,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 13:21:39,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 13:21:39,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 13:21:39,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 13:21:39,416 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-20 13:21:39,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:39,418 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 13:21:39,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:21:39,418 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 13:21:39,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1229 [2020-07-20 13:21:39,431 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:39,432 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 147, 89, 89, 89, 89, 89, 89, 89, 58, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:39,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:39,648 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:39,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:39,649 INFO L82 PathProgramCache]: Analyzing trace with hash 104339052, now seen corresponding path program 7 times [2020-07-20 13:21:39,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:39,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2061952996] [2020-07-20 13:21:39,650 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 13:21:40,111 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:40,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:40,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 2219 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:21:40,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:40,782 INFO L134 CoverageAnalysis]: Checked inductivity of 90119 backedges. 893 proven. 6738 refuted. 0 times theorem prover too weak. 82488 trivial. 0 not checked. [2020-07-20 13:21:40,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:44,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:44,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,116 INFO L134 CoverageAnalysis]: Checked inductivity of 90119 backedges. 893 proven. 6815 refuted. 0 times theorem prover too weak. 82411 trivial. 0 not checked. [2020-07-20 13:21:48,117 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2061952996] [2020-07-20 13:21:48,117 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:48,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 13:21:48,118 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780024182] [2020-07-20 13:21:48,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:21:48,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:48,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:21:48,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:21:48,122 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 13:21:48,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:48,620 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 13:21:48,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:21:48,621 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1228 [2020-07-20 13:21:48,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:48,626 INFO L225 Difference]: With dead ends: 97 [2020-07-20 13:21:48,627 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 13:21:48,628 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2463 GetRequests, 2420 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:21:48,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 13:21:48,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 13:21:48,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 13:21:48,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 13:21:48,645 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1228 [2020-07-20 13:21:48,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:48,646 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 13:21:48,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:21:48,647 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 13:21:48,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1951 [2020-07-20 13:21:48,683 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:48,684 INFO L422 BasicCegarLoop]: trace histogram [299, 299, 150, 149, 149, 149, 149, 149, 149, 149, 149, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:48,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:48,899 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:48,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:48,900 INFO L82 PathProgramCache]: Analyzing trace with hash 621098440, now seen corresponding path program 8 times [2020-07-20 13:21:48,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:48,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1845772124] [2020-07-20 13:21:48,902 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 13:21:49,556 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:49,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:49,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 3543 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:21:49,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:51,094 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1708 proven. 11918 refuted. 0 times theorem prover too weak. 219708 trivial. 0 not checked. [2020-07-20 13:21:51,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:57,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:59,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:01,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:01,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:01,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:02,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:02,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:02,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:02,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:02,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:02,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:02,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:03,691 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1708 proven. 12010 refuted. 0 times theorem prover too weak. 219616 trivial. 0 not checked. [2020-07-20 13:22:03,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1845772124] [2020-07-20 13:22:03,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:03,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 13:22:03,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272313435] [2020-07-20 13:22:03,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:22:03,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:03,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:22:03,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:22:03,696 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 13:22:04,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:04,122 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 13:22:04,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:22:04,122 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1950 [2020-07-20 13:22:04,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:04,128 INFO L225 Difference]: With dead ends: 102 [2020-07-20 13:22:04,129 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 13:22:04,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3909 GetRequests, 3861 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:22:04,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 13:22:04,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 13:22:04,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 13:22:04,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 13:22:04,147 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1950 [2020-07-20 13:22:04,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:04,150 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 13:22:04,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:22:04,150 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 13:22:04,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1690 [2020-07-20 13:22:04,172 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:04,173 INFO L422 BasicCegarLoop]: trace histogram [245, 245, 212, 122, 122, 122, 122, 122, 122, 122, 90, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:04,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:04,389 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:04,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:04,390 INFO L82 PathProgramCache]: Analyzing trace with hash 249367267, now seen corresponding path program 8 times [2020-07-20 13:22:04,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:04,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1633481588] [2020-07-20 13:22:04,391 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 13:22:05,052 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:05,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:05,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 3051 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:22:05,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:06,961 INFO L134 CoverageAnalysis]: Checked inductivity of 171450 backedges. 1545 proven. 10458 refuted. 0 times theorem prover too weak. 159447 trivial. 0 not checked. [2020-07-20 13:22:06,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:11,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:14,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:14,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:15,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:15,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:16,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:16,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:16,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:16,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:17,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:17,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:18,178 INFO L134 CoverageAnalysis]: Checked inductivity of 171450 backedges. 1545 proven. 10558 refuted. 0 times theorem prover too weak. 159347 trivial. 0 not checked. [2020-07-20 13:22:18,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1633481588] [2020-07-20 13:22:18,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:18,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 13:22:18,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654625058] [2020-07-20 13:22:18,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:22:18,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:18,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:22:18,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:22:18,182 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-20 13:22:18,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:18,637 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 13:22:18,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:22:18,638 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1689 [2020-07-20 13:22:18,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:18,645 INFO L225 Difference]: With dead ends: 107 [2020-07-20 13:22:18,645 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 13:22:18,646 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3386 GetRequests, 3338 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:22:18,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 13:22:18,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 13:22:18,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 13:22:18,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 13:22:18,663 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1689 [2020-07-20 13:22:18,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:18,664 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 13:22:18,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:22:18,664 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 13:22:18,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2341 [2020-07-20 13:22:18,700 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:18,701 INFO L422 BasicCegarLoop]: trace histogram [359, 359, 180, 179, 179, 179, 179, 179, 179, 179, 179, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:18,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:18,902 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:18,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:18,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1393099828, now seen corresponding path program 9 times [2020-07-20 13:22:18,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:18,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1305357124] [2020-07-20 13:22:18,905 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 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 13:22:19,689 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:19,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:19,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 4248 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:22:19,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:21,710 INFO L134 CoverageAnalysis]: Checked inductivity of 336699 backedges. 2291 proven. 16027 refuted. 0 times theorem prover too weak. 318381 trivial. 0 not checked. [2020-07-20 13:22:21,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:29,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:33,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:35,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:36,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:36,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:36,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:36,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:37,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:40,081 INFO L134 CoverageAnalysis]: Checked inductivity of 336699 backedges. 2291 proven. 16144 refuted. 0 times theorem prover too weak. 318264 trivial. 0 not checked. [2020-07-20 13:22:40,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1305357124] [2020-07-20 13:22:40,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:40,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 13:22:40,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123557689] [2020-07-20 13:22:40,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:22:40,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:40,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:22:40,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:22:40,085 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-20 13:22:40,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:40,863 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 13:22:40,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:22:40,864 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2340 [2020-07-20 13:22:40,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:40,870 INFO L225 Difference]: With dead ends: 112 [2020-07-20 13:22:40,870 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 13:22:40,872 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4690 GetRequests, 4637 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:22:40,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 13:22:40,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 13:22:40,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 13:22:40,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 13:22:40,888 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2340 [2020-07-20 13:22:40,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:40,890 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 13:22:40,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:22:40,891 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 13:22:40,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3057 [2020-07-20 13:22:40,983 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:40,984 INFO L422 BasicCegarLoop]: trace histogram [447, 447, 367, 223, 223, 223, 223, 223, 223, 223, 144, 80, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:41,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:41,200 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:41,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:41,202 INFO L82 PathProgramCache]: Analyzing trace with hash -1980951758, now seen corresponding path program 9 times [2020-07-20 13:22:41,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:41,202 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [954622793] [2020-07-20 13:22:41,203 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 13:22:42,217 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:42,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:42,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 5515 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:22:42,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:45,237 INFO L134 CoverageAnalysis]: Checked inductivity of 564897 backedges. 2882 proven. 21700 refuted. 0 times theorem prover too weak. 540315 trivial. 0 not checked. [2020-07-20 13:22:45,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:55,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:00,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:01,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:01,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:03,370 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:23:03,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:04,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:04,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:05,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:05,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:05,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:05,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:05,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:08,276 INFO L134 CoverageAnalysis]: Checked inductivity of 564897 backedges. 2882 proven. 21826 refuted. 0 times theorem prover too weak. 540189 trivial. 0 not checked. [2020-07-20 13:23:08,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [954622793] [2020-07-20 13:23:08,277 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:08,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 13:23:08,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887417252] [2020-07-20 13:23:08,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:23:08,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:08,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:23:08,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:23:08,280 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-20 13:23:09,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:09,152 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-20 13:23:09,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:23:09,153 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3056 [2020-07-20 13:23:09,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:09,159 INFO L225 Difference]: With dead ends: 117 [2020-07-20 13:23:09,159 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 13:23:09,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6121 GetRequests, 6068 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:23:09,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 13:23:09,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-20 13:23:09,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 13:23:09,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 13:23:09,179 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3056 [2020-07-20 13:23:09,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:09,181 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 13:23:09,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:23:09,181 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 13:23:09,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4733 [2020-07-20 13:23:09,330 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:09,331 INFO L422 BasicCegarLoop]: trace histogram [727, 727, 364, 363, 363, 363, 363, 363, 363, 363, 363, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:09,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:09,534 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:09,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:09,536 INFO L82 PathProgramCache]: Analyzing trace with hash 695057410, now seen corresponding path program 10 times [2020-07-20 13:23:09,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:09,537 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [266421659] [2020-07-20 13:23:09,537 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 13:23:11,120 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:11,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:11,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 8588 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 13:23:11,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:18,837 INFO L134 CoverageAnalysis]: Checked inductivity of 1384119 backedges. 5109 proven. 36414 refuted. 0 times theorem prover too weak. 1342596 trivial. 0 not checked. [2020-07-20 13:23:18,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:34,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:34,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:43,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:48,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:50,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:51,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:52,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:52,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:53,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:53,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:53,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:53,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:00,939 INFO L134 CoverageAnalysis]: Checked inductivity of 1384119 backedges. 5109 proven. 36559 refuted. 0 times theorem prover too weak. 1342451 trivial. 0 not checked. [2020-07-20 13:24:00,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [266421659] [2020-07-20 13:24:00,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:00,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 13:24:00,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809124452] [2020-07-20 13:24:00,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 13:24:00,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:00,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 13:24:00,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:24:00,945 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-20 13:24:02,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:02,217 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-20 13:24:02,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:24:02,219 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4732 [2020-07-20 13:24:02,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:02,228 INFO L225 Difference]: With dead ends: 122 [2020-07-20 13:24:02,228 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 13:24:02,230 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9475 GetRequests, 9417 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 13:24:02,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 13:24:02,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-20 13:24:02,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 13:24:02,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 13:24:02,260 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4732 [2020-07-20 13:24:02,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:02,266 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 13:24:02,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 13:24:02,266 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 13:24:02,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7737 [2020-07-20 13:24:02,923 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:02,928 INFO L422 BasicCegarLoop]: trace histogram [1139, 1139, 895, 569, 569, 569, 569, 569, 569, 569, 326, 244, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:03,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:03,143 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:03,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:03,146 INFO L82 PathProgramCache]: Analyzing trace with hash -885154388, now seen corresponding path program 10 times [2020-07-20 13:24:03,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:03,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1051846275] [2020-07-20 13:24:03,148 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 13:24:05,615 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:05,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:05,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 13964 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 13:24:05,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:24,072 INFO L134 CoverageAnalysis]: Checked inductivity of 3638813 backedges. 6811 proven. 62742 refuted. 0 times theorem prover too weak. 3569260 trivial. 0 not checked. [2020-07-20 13:24:24,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:24:56,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:08,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:08,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:14,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:14,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:17,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:17,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:18,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:18,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:19,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:19,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:20,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:20,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:20,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:20,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:20,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:20,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:41,205 INFO L134 CoverageAnalysis]: Checked inductivity of 3638813 backedges. 6811 proven. 62897 refuted. 0 times theorem prover too weak. 3569105 trivial. 0 not checked. [2020-07-20 13:25:41,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1051846275] [2020-07-20 13:25:41,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:25:41,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 13:25:41,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791163767] [2020-07-20 13:25:41,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 13:25:41,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:25:41,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 13:25:41,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:25:41,213 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-20 13:25:42,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:25:42,653 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-20 13:25:42,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:25:42,656 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 7736 [2020-07-20 13:25:42,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:25:42,666 INFO L225 Difference]: With dead ends: 127 [2020-07-20 13:25:42,666 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 13:25:42,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15482 GetRequests, 15424 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 13:25:42,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 13:25:42,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-20 13:25:42,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 13:25:42,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 13:25:42,694 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 7736 [2020-07-20 13:25:42,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:25:42,700 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 13:25:42,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 13:25:42,700 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 13:25:42,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6631 [2020-07-20 13:25:42,935 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:25:42,937 INFO L422 BasicCegarLoop]: trace histogram [1019, 1019, 510, 509, 509, 509, 509, 509, 509, 509, 509, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:25:43,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:43,138 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:25:43,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:25:43,141 INFO L82 PathProgramCache]: Analyzing trace with hash -629593500, now seen corresponding path program 11 times [2020-07-20 13:25:43,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:25:43,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227047123] [2020-07-20 13:25:43,143 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 13:25:45,327 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:25:45,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:25:45,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 12035 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 13:25:45,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:26:00,317 INFO L134 CoverageAnalysis]: Checked inductivity of 2721114 backedges. 6647 proven. 57292 refuted. 0 times theorem prover too weak. 2657175 trivial. 0 not checked. [2020-07-20 13:26:00,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:26:33,269 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:26:36,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:46,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:55,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:55,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:59,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:59,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:02,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:03,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:03,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:04,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:04,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:05,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:05,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:05,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:05,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:05,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:19,333 INFO L134 CoverageAnalysis]: Checked inductivity of 2721114 backedges. 6647 proven. 57468 refuted. 0 times theorem prover too weak. 2656999 trivial. 0 not checked. [2020-07-20 13:27:19,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227047123] [2020-07-20 13:27:19,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:27:19,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 13:27:19,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608616940] [2020-07-20 13:27:19,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 13:27:19,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:27:19,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 13:27:19,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:27:19,347 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-20 13:27:21,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:27:21,073 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-20 13:27:21,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 13:27:21,075 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 6630 [2020-07-20 13:27:21,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:27:21,084 INFO L225 Difference]: With dead ends: 132 [2020-07-20 13:27:21,084 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 13:27:21,086 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13272 GetRequests, 13209 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 13:27:21,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 13:27:21,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-20 13:27:21,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 13:27:21,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 13:27:21,111 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 6630 [2020-07-20 13:27:21,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:27:21,115 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 13:27:21,115 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 13:27:21,116 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 13:27:21,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5470 [2020-07-20 13:27:21,280 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:27:21,282 INFO L422 BasicCegarLoop]: trace histogram [809, 809, 608, 404, 404, 404, 404, 404, 404, 404, 204, 201, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:27:21,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:21,483 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:27:21,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:27:21,486 INFO L82 PathProgramCache]: Analyzing trace with hash 1327533009, now seen corresponding path program 11 times [2020-07-20 13:27:21,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:27:21,487 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [304615811] [2020-07-20 13:27:21,487 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 13:27:23,399 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:27:23,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:27:23,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 9883 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 13:27:23,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:27:33,391 INFO L134 CoverageAnalysis]: Checked inductivity of 1817496 backedges. 5499 proven. 47934 refuted. 0 times theorem prover too weak. 1764063 trivial. 0 not checked. [2020-07-20 13:27:33,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:27:41,020 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:27:41,124 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:27:41,229 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 13:27:41,336 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 13:28:07,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:07,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:13,818 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:28:17,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:23,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:23,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:27,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:27,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:30,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:30,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:31,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:31,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:32,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:32,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:33,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:33,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:33,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:33,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:33,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:47,202 INFO L134 CoverageAnalysis]: Checked inductivity of 1817496 backedges. 5499 proven. 48121 refuted. 0 times theorem prover too weak. 1763876 trivial. 0 not checked. [2020-07-20 13:28:47,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [304615811] [2020-07-20 13:28:47,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:28:47,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 13:28:47,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473874854] [2020-07-20 13:28:47,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 13:28:47,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:28:47,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 13:28:47,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:28:47,208 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-20 13:28:49,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:28:49,032 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-20 13:28:49,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 13:28:49,034 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 5469 [2020-07-20 13:28:49,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:28:49,045 INFO L225 Difference]: With dead ends: 137 [2020-07-20 13:28:49,046 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 13:28:49,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10949 GetRequests, 10886 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 13:28:49,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 13:28:49,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-20 13:28:49,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 13:28:49,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 13:28:49,080 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 5469 [2020-07-20 13:28:49,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:28:49,083 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 13:28:49,083 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 13:28:49,083 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 13:28:50,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12637 [2020-07-20 13:28:50,931 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:28:50,936 INFO L422 BasicCegarLoop]: trace histogram [1943, 1943, 972, 971, 971, 971, 971, 971, 971, 971, 971, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:28:51,136 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:51,139 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:28:51,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:28:51,142 INFO L82 PathProgramCache]: Analyzing trace with hash 2123078736, now seen corresponding path program 12 times [2020-07-20 13:28:51,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:28:51,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2018314616] [2020-07-20 13:28:51,144 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 13:28:55,663 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:28:55,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:28:55,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 22928 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 13:28:55,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:29:56,688 INFO L134 CoverageAnalysis]: Checked inductivity of 9901287 backedges. 13939 proven. 119225 refuted. 0 times theorem prover too weak. 9768123 trivial. 0 not checked. [2020-07-20 13:29:56,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:30:01,195 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:30:01,398 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:30:01,505 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:30:04,977 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:30:05,087 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:30:05,203 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:30:05,321 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:30:11,585 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:30:11,713 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:30:11,841 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:30:11,961 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:30:18,721 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:30:18,861 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:30:19,010 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:30:19,157 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:30:19,303 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 13:30:19,440 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 13:30:19,572 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 13:30:19,693 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 13:30:19,811 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 13:30:19,917 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 13:31:14,953 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:31:16,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:56,365 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 13:32:02,323 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:32:03,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:03,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:29,371 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:32:29,476 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:32:30,885 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:32:31,004 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:32:31,130 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:32:31,256 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:32:31,380 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:32:31,495 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:32:31,607 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:32:32,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:32,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:35,359 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:32:43,421 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:32:45,078 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:32:45,185 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:32:45,304 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:32:45,417 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:32:45,529 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:32:45,633 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:32:46,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:32:58,664 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:32:59,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:04,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:08,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:10,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:10,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:11,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:11,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:12,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:33:12,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:07,338 INFO L134 CoverageAnalysis]: Checked inductivity of 9901287 backedges. 13939 proven. 119435 refuted. 0 times theorem prover too weak. 9767913 trivial. 0 not checked. [2020-07-20 13:34:07,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2018314616] [2020-07-20 13:34:07,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:07,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-20 13:34:07,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563639405] [2020-07-20 13:34:07,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 13:34:07,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:07,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 13:34:07,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-20 13:34:07,345 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 31 states. [2020-07-20 13:34:09,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:09,566 INFO L93 Difference]: Finished difference Result 142 states and 768 transitions. [2020-07-20 13:34:09,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 13:34:09,569 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 12636 [2020-07-20 13:34:09,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:09,582 INFO L225 Difference]: With dead ends: 142 [2020-07-20 13:34:09,582 INFO L226 Difference]: Without dead ends: 138 [2020-07-20 13:34:09,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25285 GetRequests, 25217 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 13:34:09,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-20 13:34:09,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 81. [2020-07-20 13:34:09,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-20 13:34:09,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 265 transitions. [2020-07-20 13:34:09,614 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 265 transitions. Word has length 12636 [2020-07-20 13:34:09,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:09,621 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 265 transitions. [2020-07-20 13:34:09,621 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 13:34:09,621 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 265 transitions. [2020-07-20 13:34:10,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14081 [2020-07-20 13:34:10,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:10,629 INFO L422 BasicCegarLoop]: trace histogram [2067, 2067, 1671, 1033, 1033, 1033, 1033, 1033, 1033, 1033, 638, 396, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:10,834 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:10,835 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:10,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:10,840 INFO L82 PathProgramCache]: Analyzing trace with hash 1488445612, now seen corresponding path program 12 times [2020-07-20 13:34:10,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:10,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [499948785] [2020-07-20 13:34:10,841 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 13:34:15,431 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:15,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:15,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 25400 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 13:34:15,615 INFO L286 TraceCheckSpWp]: Computing forward predicates...