/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_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o200.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:06:59,539 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:06:59,543 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:06:59,566 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:06:59,567 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:06:59,570 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:06:59,574 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:06:59,590 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:06:59,592 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:06:59,599 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:06:59,604 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:06:59,606 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:06:59,606 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:06:59,607 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:06:59,611 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:06:59,613 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:06:59,618 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:06:59,620 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:06:59,624 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:06:59,629 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:06:59,635 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:06:59,637 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:06:59,643 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:06:59,645 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:06:59,650 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:06:59,676 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:06:59,678 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:06:59,681 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:06:59,683 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:06:59,732 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:06:59,733 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:06:59,738 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:06:59,738 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:06:59,739 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:06:59,739 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:06:59,739 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:06:59,739 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:06:59,740 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:06:59,740 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:06:59,742 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:06:59,742 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:06:59,743 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:06:59,743 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:06:59,744 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:06:59,744 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:06:59,744 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:06:59,744 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:06:59,745 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:06:59,745 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:06:59,745 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:06:59,745 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:06:59,746 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:06:59,746 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:06:59,746 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:06:59,747 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:06:59,747 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:59,747 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:06:59,747 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:06:59,747 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_VARIABLES 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 -> 2 [2020-07-21 16:07:00,164 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:07:00,195 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:07:00,202 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:07:00,204 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:07:00,205 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:07:00,206 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o200.c [2020-07-21 16:07:00,330 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/de35e9ceb/397ffaeeff424a0f8b6cf36349fd2151/FLAGf14265918 [2020-07-21 16:07:01,115 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:07:01,117 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o200.c [2020-07-21 16:07:01,134 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/de35e9ceb/397ffaeeff424a0f8b6cf36349fd2151/FLAGf14265918 [2020-07-21 16:07:01,362 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/de35e9ceb/397ffaeeff424a0f8b6cf36349fd2151 [2020-07-21 16:07:01,379 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:07:01,384 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:07:01,386 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:07:01,386 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:07:01,392 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:07:01,394 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:07:01" (1/1) ... [2020-07-21 16:07:01,398 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74e6fc25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:07:01, skipping insertion in model container [2020-07-21 16:07:01,399 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:07:01" (1/1) ... [2020-07-21 16:07:01,410 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:07:01,435 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:07:01,678 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:07:01,685 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:07:01,701 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:07:01,719 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:07:01,720 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:07:01 WrapperNode [2020-07-21 16:07:01,720 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:07:01,722 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:07:01,722 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:07:01,722 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:07:01,739 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:07:01" (1/1) ... [2020-07-21 16:07:01,740 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:07:01" (1/1) ... [2020-07-21 16:07:01,749 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:07:01" (1/1) ... [2020-07-21 16:07:01,750 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:07:01" (1/1) ... [2020-07-21 16:07:01,755 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:07:01" (1/1) ... [2020-07-21 16:07:01,759 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:07:01" (1/1) ... [2020-07-21 16:07:01,761 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:07:01" (1/1) ... [2020-07-21 16:07:01,762 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:07:01,763 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:07:01,763 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:07:01,763 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:07:01,764 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:07:01" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:07:01,979 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:07:01,980 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:07:01,980 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 16:07:01,980 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:07:01,980 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 16:07:01,981 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:07:01,982 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 16:07:01,982 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:07:01,982 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:07:01,982 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:07:02,222 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:07:02,223 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 16:07:02,229 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:07:02 BoogieIcfgContainer [2020-07-21 16:07:02,230 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:07:02,232 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:07:02,233 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:07:02,245 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:07:02,246 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:07:01" (1/3) ... [2020-07-21 16:07:02,247 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@598ad387 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:07:02, skipping insertion in model container [2020-07-21 16:07:02,247 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:07:01" (2/3) ... [2020-07-21 16:07:02,248 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@598ad387 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:07:02, skipping insertion in model container [2020-07-21 16:07:02,248 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:07:02" (3/3) ... [2020-07-21 16:07:02,251 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o200.c [2020-07-21 16:07:02,267 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:07:02,277 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:07:02,298 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:07:02,355 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:07:02,355 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:07:02,356 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:07:02,356 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:07:02,356 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:07:02,356 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:07:02,357 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:07:02,357 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:07:02,386 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 16:07:02,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:07:02,398 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:02,400 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:07:02,401 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:07:02,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:07:02,410 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 16:07:02,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:07:02,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [542989734] [2020-07-21 16:07:02,423 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:02,536 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:07:02,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:07:02,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 16:07:02,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:07:02,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:07:02,702 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:07:02,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [542989734] [2020-07-21 16:07:02,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:07:02,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:07:02,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855840772] [2020-07-21 16:07:02,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:07:02,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:02,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:07:02,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:07:02,752 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 16:07:02,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:07:02,854 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-21 16:07:02,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:07:02,857 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 16:07:02,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:07:02,872 INFO L225 Difference]: With dead ends: 32 [2020-07-21 16:07:02,873 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 16:07:02,878 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:07:02,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 16:07:02,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 16:07:02,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 16:07:02,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 16:07:02,960 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 16:07:02,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:07:02,961 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 16:07:02,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:07:02,962 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 16:07:02,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 16:07:02,966 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:02,966 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:07:03,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:03,182 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:07:03,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:07:03,184 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 16:07:03,184 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:07:03,185 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [549906058] [2020-07-21 16:07:03,185 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:03,252 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:07:03,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:07:03,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:07:03,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:07:03,431 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 16:07:03,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:07:03,769 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 16:07:03,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [549906058] [2020-07-21 16:07:03,771 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:07:03,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 16:07:03,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219400832] [2020-07-21 16:07:03,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:07:03,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:03,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:07:03,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:07:03,778 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-21 16:07:03,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:07:03,867 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-21 16:07:03,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:07:03,869 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-21 16:07:03,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:07:03,871 INFO L225 Difference]: With dead ends: 30 [2020-07-21 16:07:03,871 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 16:07:03,874 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:07:03,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 16:07:03,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 16:07:03,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 16:07:03,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 16:07:03,885 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-21 16:07:03,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:07:03,886 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 16:07:03,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:07:03,887 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 16:07:03,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 16:07:03,889 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:03,889 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:07:04,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:04,104 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:07:04,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:07:04,106 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-21 16:07:04,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:07:04,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647325876] [2020-07-21 16:07:04,108 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:04,218 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:07:04,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:07:04,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 16:07:04,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:07:04,378 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 16:07:04,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:07:05,209 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 16:07:05,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [647325876] [2020-07-21 16:07:05,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:07:05,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 16:07:05,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604926096] [2020-07-21 16:07:05,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:07:05,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:05,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:07:05,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:07:05,235 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-21 16:07:05,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:07:05,848 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-21 16:07:05,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 16:07:05,849 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-21 16:07:05,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:07:05,851 INFO L225 Difference]: With dead ends: 42 [2020-07-21 16:07:05,851 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 16:07:05,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:07:05,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 16:07:05,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 16:07:05,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 16:07:05,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 16:07:05,864 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-21 16:07:05,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:07:05,865 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 16:07:05,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:07:05,865 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 16:07:05,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 16:07:05,868 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:05,868 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:07:06,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:06,071 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:07:06,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:07:06,072 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-21 16:07:06,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:07:06,073 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [727186135] [2020-07-21 16:07:06,073 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:06,140 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:07:06,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:07:06,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 16:07:06,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:07:06,501 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 16:07:06,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:07:10,746 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 75 refuted. 2 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 16:07:10,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [727186135] [2020-07-21 16:07:10,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:07:10,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-21 16:07:10,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206206777] [2020-07-21 16:07:10,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 16:07:10,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:10,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 16:07:10,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1075, Unknown=1, NotChecked=0, Total=1260 [2020-07-21 16:07:10,757 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-21 16:07:11,707 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 16:07:12,262 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 16:07:13,123 WARN L193 SmtUtils]: Spent 376.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-21 16:07:13,635 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-21 16:07:14,758 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 16:07:20,317 WARN L193 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 16 [2020-07-21 16:07:23,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:07:23,113 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-21 16:07:23,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 16:07:23,118 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-21 16:07:23,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:07:23,121 INFO L225 Difference]: With dead ends: 66 [2020-07-21 16:07:23,121 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 16:07:23,125 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=382, Invalid=1872, Unknown=2, NotChecked=0, Total=2256 [2020-07-21 16:07:23,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 16:07:23,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-21 16:07:23,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 16:07:23,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-21 16:07:23,141 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-21 16:07:23,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:07:23,142 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-21 16:07:23,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 16:07:23,142 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-21 16:07:23,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-21 16:07:23,146 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:23,146 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:07:23,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:23,368 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:07:23,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:07:23,369 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-21 16:07:23,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:07:23,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [914270429] [2020-07-21 16:07:23,371 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:23,448 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:07:23,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:07:23,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 16:07:23,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:07:24,334 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 16:07:24,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:08:02,544 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 329 refuted. 16 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 16:08:02,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [914270429] [2020-07-21 16:08:02,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:08:02,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-21 16:08:02,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851714912] [2020-07-21 16:08:02,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 16:08:02,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:08:02,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 16:08:02,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=3925, Unknown=15, NotChecked=0, Total=4556 [2020-07-21 16:08:02,552 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-21 16:08:08,288 WARN L193 SmtUtils]: Spent 802.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 13 [2020-07-21 16:08:12,881 WARN L193 SmtUtils]: Spent 397.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-21 16:08:18,400 WARN L193 SmtUtils]: Spent 533.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 13 [2020-07-21 16:08:23,321 WARN L193 SmtUtils]: Spent 984.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-21 16:08:28,503 WARN L193 SmtUtils]: Spent 1.45 s on a formula simplification. DAG size of input: 68 DAG size of output: 13 [2020-07-21 16:08:36,093 WARN L193 SmtUtils]: Spent 2.45 s on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-21 16:08:40,344 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 13 [2020-07-21 16:08:46,620 WARN L193 SmtUtils]: Spent 2.54 s on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-21 16:08:50,036 WARN L193 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-21 16:08:55,912 WARN L193 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 16:09:01,629 WARN L193 SmtUtils]: Spent 558.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-21 16:09:07,146 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 16:09:15,280 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-21 16:09:22,056 WARN L193 SmtUtils]: Spent 2.33 s on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-21 16:09:34,426 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-21 16:09:44,439 WARN L193 SmtUtils]: Spent 2.36 s on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 16:09:53,032 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 16:10:03,437 WARN L193 SmtUtils]: Spent 4.33 s on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 16:10:12,122 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-21 16:10:18,585 WARN L193 SmtUtils]: Spent 2.25 s on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-21 16:10:31,157 WARN L193 SmtUtils]: Spent 4.24 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 16:10:47,670 WARN L193 SmtUtils]: Spent 2.10 s on a formula simplification. DAG size of input: 18 DAG size of output: 13 [2020-07-21 16:10:59,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:59,896 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2020-07-21 16:10:59,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-21 16:10:59,898 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-21 16:10:59,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:59,902 INFO L225 Difference]: With dead ends: 114 [2020-07-21 16:10:59,902 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 16:10:59,906 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 703 ImplicationChecksByTransitivity, 212.0s TimeCoverageRelationStatistics Valid=1518, Invalid=7572, Unknown=30, NotChecked=0, Total=9120 [2020-07-21 16:10:59,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 16:10:59,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-21 16:10:59,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 16:10:59,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2020-07-21 16:10:59,925 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 103 [2020-07-21 16:10:59,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:59,926 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2020-07-21 16:10:59,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 16:10:59,926 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2020-07-21 16:10:59,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-21 16:10:59,930 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:59,931 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:11:00,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:00,141 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:11:00,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:11:00,142 INFO L82 PathProgramCache]: Analyzing trace with hash -935230737, now seen corresponding path program 5 times [2020-07-21 16:11:00,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:11:00,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1965005681] [2020-07-21 16:11:00,143 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:00,249 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:11:00,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:11:00,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 131 conjunts are in the unsatisfiable core [2020-07-21 16:11:00,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:11:03,752 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-21 16:11:03,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:13:24,088 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1403 refuted. 54 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-21 16:13:24,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1965005681] [2020-07-21 16:13:24,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:13:24,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-21 16:13:24,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190318008] [2020-07-21 16:13:24,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-21 16:13:24,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:13:24,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-21 16:13:24,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2248, Invalid=14990, Unknown=54, NotChecked=0, Total=17292 [2020-07-21 16:13:24,099 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 132 states. [2020-07-21 16:14:21,541 WARN L193 SmtUtils]: Spent 4.93 s on a formula simplification. DAG size of input: 158 DAG size of output: 13 [2020-07-21 16:15:20,988 WARN L193 SmtUtils]: Spent 9.01 s on a formula simplification. DAG size of input: 156 DAG size of output: 11 [2020-07-21 16:16:17,185 WARN L193 SmtUtils]: Spent 7.52 s on a formula simplification. DAG size of input: 153 DAG size of output: 13 [2020-07-21 16:17:21,731 WARN L193 SmtUtils]: Spent 12.02 s on a formula simplification. DAG size of input: 151 DAG size of output: 11 [2020-07-21 16:18:03,179 WARN L193 SmtUtils]: Spent 4.36 s on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-21 16:18:56,876 WARN L193 SmtUtils]: Spent 6.41 s on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2020-07-21 16:19:43,836 WARN L193 SmtUtils]: Spent 5.37 s on a formula simplification. DAG size of input: 143 DAG size of output: 13 [2020-07-21 16:20:32,729 WARN L193 SmtUtils]: Spent 6.85 s on a formula simplification. DAG size of input: 141 DAG size of output: 11 [2020-07-21 16:21:24,765 WARN L193 SmtUtils]: Spent 7.91 s on a formula simplification. DAG size of input: 138 DAG size of output: 13