/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 10:21:23,624 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:21:23,627 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:21:23,654 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:21:23,654 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:21:23,655 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:21:23,657 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:21:23,659 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:21:23,661 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:21:23,662 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:21:23,663 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:21:23,664 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:21:23,665 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:21:23,666 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:21:23,667 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:21:23,668 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:21:23,669 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:21:23,671 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:21:23,672 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:21:23,675 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:21:23,676 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:21:23,678 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:21:23,679 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:21:23,680 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:21:23,683 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-21 10:21:23,692 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:21:23,693 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:21:23,694 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:21:23,695 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-21 10:21:23,720 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:21:23,721 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:21:23,722 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:21:23,722 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:21:23,722 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:21:23,723 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:21:23,723 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:21:23,723 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:21:23,723 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:21:23,723 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:21:23,724 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:21:23,724 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:21:23,724 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:21:23,724 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:21:23,724 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:21:23,725 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:21:23,725 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:21:23,725 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:21:23,725 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:21:23,725 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:21:23,726 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:21:23,726 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:21:23,726 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:21:23,726 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:21:23,726 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:21:23,727 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:21:23,727 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:21:23,727 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:21:23,727 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:21:23,727 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false [2020-09-21 10:21:24,232 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:21:24,252 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:21:24,256 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:21:24,258 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:21:24,259 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:21:24,260 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-09-21 10:21:24,351 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5d8cb1d8d/ffb9144fa4da4cd39490258e2c9fa734/FLAGe23b73fb5 [2020-09-21 10:21:24,924 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:21:24,925 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-09-21 10:21:24,934 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5d8cb1d8d/ffb9144fa4da4cd39490258e2c9fa734/FLAGe23b73fb5 [2020-09-21 10:21:25,246 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5d8cb1d8d/ffb9144fa4da4cd39490258e2c9fa734 [2020-09-21 10:21:25,264 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:21:25,272 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:21:25,276 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:21:25,276 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:21:25,281 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:21:25,282 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:25,288 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@434f45a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25, skipping insertion in model container [2020-09-21 10:21:25,288 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:25,299 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:21:25,332 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:21:25,592 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:21:25,604 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:21:25,629 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:21:25,649 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:21:25,650 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25 WrapperNode [2020-09-21 10:21:25,650 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:21:25,651 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:21:25,651 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:21:25,651 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:21:25,746 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:25,746 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:25,758 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:25,758 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:25,769 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:25,775 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:25,777 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... [2020-09-21 10:21:25,780 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:21:25,780 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:21:25,781 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:21:25,781 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:21:25,782 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-21 10:21:25,857 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:21:25,857 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:21:25,857 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-09-21 10:21:25,857 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:21:25,858 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:21:25,858 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-21 10:21:25,858 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-09-21 10:21:25,858 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-09-21 10:21:25,858 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-21 10:21:25,859 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:21:25,859 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-21 10:21:25,859 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-21 10:21:25,859 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-09-21 10:21:25,859 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-21 10:21:25,860 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:21:25,860 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:21:26,219 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:21:26,220 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-09-21 10:21:26,224 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:21:26 BoogieIcfgContainer [2020-09-21 10:21:26,225 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:21:26,226 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:21:26,226 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:21:26,230 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:21:26,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:21:25" (1/3) ... [2020-09-21 10:21:26,231 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@adcd1fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:21:26, skipping insertion in model container [2020-09-21 10:21:26,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:21:25" (2/3) ... [2020-09-21 10:21:26,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@adcd1fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:21:26, skipping insertion in model container [2020-09-21 10:21:26,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:21:26" (3/3) ... [2020-09-21 10:21:26,234 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-09-21 10:21:26,246 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:21:26,256 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:21:26,280 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:21:26,310 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:21:26,310 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:21:26,310 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:21:26,310 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:21:26,310 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:21:26,311 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:21:26,311 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:21:26,311 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:21:26,335 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-09-21 10:21:26,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-21 10:21:26,341 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:26,343 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:26,343 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:26,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:26,351 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-09-21 10:21:26,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:26,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1903016905] [2020-09-21 10:21:26,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:26,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:26,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:26,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:26,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-21 10:21:26,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:26,600 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:26,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1903016905] [2020-09-21 10:21:26,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:21:26,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-21 10:21:26,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354739835] [2020-09-21 10:21:26,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-21 10:21:26,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:26,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-21 10:21:26,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 10:21:26,630 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-09-21 10:21:26,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:26,761 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-09-21 10:21:26,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 10:21:26,764 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-09-21 10:21:26,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:26,780 INFO L225 Difference]: With dead ends: 42 [2020-09-21 10:21:26,780 INFO L226 Difference]: Without dead ends: 20 [2020-09-21 10:21:26,785 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 10:21:26,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-09-21 10:21:26,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-09-21 10:21:26,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-09-21 10:21:26,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-09-21 10:21:26,829 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-09-21 10:21:26,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:26,829 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-09-21 10:21:26,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-21 10:21:26,830 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-09-21 10:21:26,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-09-21 10:21:26,830 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:26,831 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:26,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:21:26,832 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:26,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:26,832 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-09-21 10:21:26,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:26,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [711134346] [2020-09-21 10:21:26,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:26,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:26,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:26,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:26,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-21 10:21:26,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:26,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:26,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [711134346] [2020-09-21 10:21:26,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:21:26,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:21:26,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170174781] [2020-09-21 10:21:26,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:21:26,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:26,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:21:26,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:21:26,944 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-09-21 10:21:27,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:27,007 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-09-21 10:21:27,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 10:21:27,008 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-09-21 10:21:27,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:27,009 INFO L225 Difference]: With dead ends: 34 [2020-09-21 10:21:27,009 INFO L226 Difference]: Without dead ends: 22 [2020-09-21 10:21:27,011 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:21:27,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-09-21 10:21:27,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-09-21 10:21:27,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-09-21 10:21:27,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-09-21 10:21:27,018 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-09-21 10:21:27,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:27,018 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-09-21 10:21:27,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:21:27,019 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-09-21 10:21:27,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-09-21 10:21:27,020 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:27,020 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:27,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:21:27,020 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:27,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:27,021 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-09-21 10:21:27,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:27,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1222083596] [2020-09-21 10:21:27,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:27,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:27,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-09-21 10:21:27,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:27,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1222083596] [2020-09-21 10:21:27,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:27,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-21 10:21:27,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391392309] [2020-09-21 10:21:27,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:21:27,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:27,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:21:27,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:21:27,142 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-09-21 10:21:27,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:27,218 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-09-21 10:21:27,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:21:27,219 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-09-21 10:21:27,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:27,220 INFO L225 Difference]: With dead ends: 36 [2020-09-21 10:21:27,220 INFO L226 Difference]: Without dead ends: 24 [2020-09-21 10:21:27,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:21:27,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-09-21 10:21:27,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-09-21 10:21:27,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-09-21 10:21:27,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-09-21 10:21:27,228 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-09-21 10:21:27,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:27,228 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-09-21 10:21:27,228 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:21:27,229 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-09-21 10:21:27,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-21 10:21:27,230 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:27,230 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:27,230 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:21:27,231 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:27,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:27,231 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-09-21 10:21:27,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:27,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [959601340] [2020-09-21 10:21:27,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:27,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:27,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-09-21 10:21:27,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,378 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:27,380 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [959601340] [2020-09-21 10:21:27,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:27,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 10:21:27,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308802406] [2020-09-21 10:21:27,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:21:27,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:27,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:21:27,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:21:27,386 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-09-21 10:21:27,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:27,475 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-09-21 10:21:27,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:21:27,476 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-09-21 10:21:27,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:27,477 INFO L225 Difference]: With dead ends: 38 [2020-09-21 10:21:27,477 INFO L226 Difference]: Without dead ends: 26 [2020-09-21 10:21:27,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:21:27,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-09-21 10:21:27,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-09-21 10:21:27,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-09-21 10:21:27,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-09-21 10:21:27,485 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-09-21 10:21:27,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:27,485 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-09-21 10:21:27,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:21:27,486 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-09-21 10:21:27,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-21 10:21:27,487 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:27,487 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:27,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:21:27,488 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:27,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:27,489 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-09-21 10:21:27,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:27,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [626605764] [2020-09-21 10:21:27,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:27,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:27,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-09-21 10:21:27,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,607 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:27,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [626605764] [2020-09-21 10:21:27,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:27,608 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 10:21:27,608 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360506809] [2020-09-21 10:21:27,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:21:27,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:27,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:21:27,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:21:27,610 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-09-21 10:21:27,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:27,683 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-09-21 10:21:27,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 10:21:27,683 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-09-21 10:21:27,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:27,684 INFO L225 Difference]: With dead ends: 40 [2020-09-21 10:21:27,685 INFO L226 Difference]: Without dead ends: 28 [2020-09-21 10:21:27,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:21:27,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-09-21 10:21:27,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-09-21 10:21:27,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-09-21 10:21:27,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-09-21 10:21:27,692 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-09-21 10:21:27,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:27,692 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-09-21 10:21:27,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:21:27,692 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-09-21 10:21:27,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-21 10:21:27,693 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:27,694 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:27,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:21:27,694 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:27,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:27,695 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-09-21 10:21:27,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:27,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1588539909] [2020-09-21 10:21:27,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:27,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:27,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-09-21 10:21:27,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:27,814 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:27,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1588539909] [2020-09-21 10:21:27,814 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:27,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 10:21:27,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443719829] [2020-09-21 10:21:27,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:21:27,816 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:27,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:21:27,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:21:27,817 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-09-21 10:21:27,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:27,887 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-09-21 10:21:27,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 10:21:27,887 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-09-21 10:21:27,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:27,888 INFO L225 Difference]: With dead ends: 42 [2020-09-21 10:21:27,888 INFO L226 Difference]: Without dead ends: 30 [2020-09-21 10:21:27,889 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:21:27,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-21 10:21:27,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-09-21 10:21:27,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-09-21 10:21:27,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-09-21 10:21:27,895 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-09-21 10:21:27,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:27,896 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-09-21 10:21:27,896 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:21:27,896 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-09-21 10:21:27,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:21:27,897 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:27,897 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:27,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:21:27,898 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:27,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:27,898 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-09-21 10:21:27,898 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:27,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [26885334] [2020-09-21 10:21:27,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:27,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:28,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-09-21 10:21:28,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,019 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:28,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [26885334] [2020-09-21 10:21:28,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:28,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 10:21:28,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142042178] [2020-09-21 10:21:28,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 10:21:28,021 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:28,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 10:21:28,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:21:28,022 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-09-21 10:21:28,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:28,114 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-09-21 10:21:28,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-21 10:21:28,114 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-09-21 10:21:28,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:28,115 INFO L225 Difference]: With dead ends: 44 [2020-09-21 10:21:28,115 INFO L226 Difference]: Without dead ends: 32 [2020-09-21 10:21:28,116 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:21:28,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-09-21 10:21:28,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-09-21 10:21:28,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-21 10:21:28,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-09-21 10:21:28,122 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-09-21 10:21:28,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:28,122 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-09-21 10:21:28,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 10:21:28,123 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-09-21 10:21:28,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-09-21 10:21:28,124 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:28,124 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:28,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 10:21:28,125 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:28,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:28,125 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-09-21 10:21:28,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:28,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1397554094] [2020-09-21 10:21:28,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:28,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:28,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-21 10:21:28,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,317 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:28,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1397554094] [2020-09-21 10:21:28,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:28,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:21:28,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152495839] [2020-09-21 10:21:28,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:21:28,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:28,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:21:28,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:21:28,320 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-09-21 10:21:28,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:28,417 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-09-21 10:21:28,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:21:28,418 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-09-21 10:21:28,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:28,419 INFO L225 Difference]: With dead ends: 46 [2020-09-21 10:21:28,419 INFO L226 Difference]: Without dead ends: 34 [2020-09-21 10:21:28,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:21:28,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-21 10:21:28,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-09-21 10:21:28,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-09-21 10:21:28,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-09-21 10:21:28,426 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-09-21 10:21:28,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:28,426 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-09-21 10:21:28,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:21:28,426 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-09-21 10:21:28,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-09-21 10:21:28,427 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:28,428 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:28,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 10:21:28,428 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:28,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:28,429 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-09-21 10:21:28,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:28,429 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997982142] [2020-09-21 10:21:28,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:28,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:28,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-09-21 10:21:28,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,591 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:28,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997982142] [2020-09-21 10:21:28,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:28,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-21 10:21:28,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438608493] [2020-09-21 10:21:28,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-21 10:21:28,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:28,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-21 10:21:28,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:21:28,595 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-09-21 10:21:28,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:28,725 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-09-21 10:21:28,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-21 10:21:28,726 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-09-21 10:21:28,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:28,727 INFO L225 Difference]: With dead ends: 48 [2020-09-21 10:21:28,727 INFO L226 Difference]: Without dead ends: 36 [2020-09-21 10:21:28,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:21:28,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-09-21 10:21:28,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-09-21 10:21:28,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-09-21 10:21:28,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-09-21 10:21:28,733 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-09-21 10:21:28,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:28,734 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-09-21 10:21:28,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-21 10:21:28,734 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-09-21 10:21:28,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-21 10:21:28,735 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:28,735 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:28,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 10:21:28,736 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:28,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:28,736 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-09-21 10:21:28,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:28,737 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2068967273] [2020-09-21 10:21:28,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:28,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:28,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-09-21 10:21:28,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:28,901 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:28,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2068967273] [2020-09-21 10:21:28,902 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:28,902 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-21 10:21:28,903 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275836589] [2020-09-21 10:21:28,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-21 10:21:28,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:28,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-21 10:21:28,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:21:28,904 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-09-21 10:21:29,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:29,007 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-09-21 10:21:29,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-21 10:21:29,008 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-09-21 10:21:29,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:29,008 INFO L225 Difference]: With dead ends: 50 [2020-09-21 10:21:29,009 INFO L226 Difference]: Without dead ends: 38 [2020-09-21 10:21:29,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:21:29,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-09-21 10:21:29,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-09-21 10:21:29,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-21 10:21:29,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-09-21 10:21:29,017 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-09-21 10:21:29,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:29,017 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-09-21 10:21:29,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-21 10:21:29,018 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-09-21 10:21:29,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-21 10:21:29,022 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:29,022 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:29,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-21 10:21:29,023 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:29,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:29,023 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-09-21 10:21:29,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:29,024 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [453957917] [2020-09-21 10:21:29,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:29,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:29,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:29,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:29,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-09-21 10:21:29,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:29,219 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:21:29,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [453957917] [2020-09-21 10:21:29,220 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:29,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:21:29,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130787429] [2020-09-21 10:21:29,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:21:29,223 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:29,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:21:29,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:21:29,224 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-09-21 10:21:29,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:29,334 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-09-21 10:21:29,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-21 10:21:29,335 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-09-21 10:21:29,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:29,336 INFO L225 Difference]: With dead ends: 51 [2020-09-21 10:21:29,336 INFO L226 Difference]: Without dead ends: 39 [2020-09-21 10:21:29,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:21:29,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-09-21 10:21:29,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-09-21 10:21:29,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-09-21 10:21:29,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-09-21 10:21:29,348 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-09-21 10:21:29,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:29,348 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-09-21 10:21:29,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:21:29,348 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-09-21 10:21:29,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-09-21 10:21:29,352 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:29,352 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:29,352 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-21 10:21:29,352 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:29,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:29,353 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-09-21 10:21:29,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:29,353 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [867438025] [2020-09-21 10:21:29,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:29,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:40,449 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-09-21 10:21:41,584 WARN L193 SmtUtils]: Spent 933.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-09-21 10:21:46,037 WARN L193 SmtUtils]: Spent 4.07 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-09-21 10:22:14,373 WARN L193 SmtUtils]: Spent 27.53 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-09-21 10:22:14,690 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 31 [2020-09-21 10:22:14,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:22:14,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:22:14,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-09-21 10:22:14,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:22:14,797 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-21 10:22:14,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [867438025] [2020-09-21 10:22:14,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:22:14,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-09-21 10:22:14,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982880438] [2020-09-21 10:22:14,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-21 10:22:14,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:22:14,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-21 10:22:14,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:22:14,801 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-09-21 10:22:15,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:22:15,294 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-09-21 10:22:15,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-21 10:22:15,295 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-09-21 10:22:15,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:22:15,296 INFO L225 Difference]: With dead ends: 49 [2020-09-21 10:22:15,296 INFO L226 Difference]: Without dead ends: 41 [2020-09-21 10:22:15,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 34.1s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:22:15,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-09-21 10:22:15,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-09-21 10:22:15,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-21 10:22:15,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-09-21 10:22:15,303 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-09-21 10:22:15,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:22:15,304 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-09-21 10:22:15,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-21 10:22:15,304 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-09-21 10:22:15,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-09-21 10:22:15,305 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:22:15,305 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:22:15,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-21 10:22:15,306 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:22:15,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:22:15,306 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-09-21 10:22:15,306 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:22:15,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1900510590] [2020-09-21 10:22:15,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:22:15,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:22:20,004 WARN L193 SmtUtils]: Spent 441.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-09-21 10:22:21,148 WARN L193 SmtUtils]: Spent 936.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-09-21 10:22:25,572 WARN L193 SmtUtils]: Spent 4.07 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-09-21 10:22:25,784 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2020-09-21 10:22:26,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:22:26,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:22:26,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-09-21 10:22:26,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:22:26,223 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-21 10:22:26,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1900510590] [2020-09-21 10:22:26,224 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:22:26,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-21 10:22:26,224 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746060913] [2020-09-21 10:22:26,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-21 10:22:26,225 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:22:26,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-21 10:22:26,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:22:26,226 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-09-21 10:22:27,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:22:27,284 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-09-21 10:22:27,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-21 10:22:27,285 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-09-21 10:22:27,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:22:27,288 INFO L225 Difference]: With dead ends: 48 [2020-09-21 10:22:27,288 INFO L226 Difference]: Without dead ends: 43 [2020-09-21 10:22:27,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:22:27,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-09-21 10:22:27,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-09-21 10:22:27,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-09-21 10:22:27,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-09-21 10:22:27,302 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-09-21 10:22:27,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:22:27,303 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-09-21 10:22:27,303 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-21 10:22:27,303 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-09-21 10:22:27,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-21 10:22:27,304 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:22:27,304 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:22:27,304 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-21 10:22:27,304 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:22:27,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:22:27,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-09-21 10:22:27,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:22:27,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488508593] [2020-09-21 10:22:27,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:22:27,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat