/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 true --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 14:08:21,722 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 14:08:21,725 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 14:08:21,751 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 14:08:21,751 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 14:08:21,752 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 14:08:21,754 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 14:08:21,756 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 14:08:21,758 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 14:08:21,758 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 14:08:21,759 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 14:08:21,761 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 14:08:21,761 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 14:08:21,762 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 14:08:21,763 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 14:08:21,764 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 14:08:21,765 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 14:08:21,766 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 14:08:21,767 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 14:08:21,769 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 14:08:21,771 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 14:08:21,772 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 14:08:21,773 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 14:08:21,774 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 14:08:21,776 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 14:08:21,784 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 14:08:21,785 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 14:08:21,785 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 14:08:21,788 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 [2020-08-21 14:08:21,832 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 14:08:21,832 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 14:08:21,835 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 14:08:21,836 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 14:08:21,836 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 14:08:21,836 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 14:08:21,836 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 14:08:21,837 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 14:08:21,837 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 14:08:21,837 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 14:08:21,837 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 14:08:21,837 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 14:08:21,837 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 14:08:21,841 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 14:08:21,841 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 14:08:21,841 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 14:08:21,841 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 14:08:21,842 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 14:08:21,842 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 14:08:21,842 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 14:08:21,842 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 14:08:21,842 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 14:08:21,845 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 14:08:21,845 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 14:08:21,845 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 14:08:21,845 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 14:08:21,846 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 14:08:21,846 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 14:08:21,846 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 14:08:21,846 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 -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> log-additional-information=true; [2020-08-21 14:08:22,183 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 14:08:22,204 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 14:08:22,210 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 14:08:22,212 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 14:08:22,212 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 14:08:22,214 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-21 14:08:22,283 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ad037d686/82474c9a31274f97a15345bb3ba58528/FLAG9cafa7b5f [2020-08-21 14:08:22,806 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 14:08:22,806 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-21 14:08:22,813 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ad037d686/82474c9a31274f97a15345bb3ba58528/FLAG9cafa7b5f [2020-08-21 14:08:23,203 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ad037d686/82474c9a31274f97a15345bb3ba58528 [2020-08-21 14:08:23,213 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 14:08:23,214 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 14:08:23,217 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 14:08:23,217 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 14:08:23,221 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 14:08:23,222 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:08:23" (1/1) ... [2020-08-21 14:08:23,226 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5bf4d1bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:23, skipping insertion in model container [2020-08-21 14:08:23,226 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:08:23" (1/1) ... [2020-08-21 14:08:23,236 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 14:08:23,259 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 14:08:23,522 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:08:23,534 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 14:08:23,553 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:08:23,653 INFO L208 MainTranslator]: Completed translation [2020-08-21 14:08:23,653 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:23 WrapperNode [2020-08-21 14:08:23,653 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 14:08:23,654 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 14:08:23,654 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 14:08:23,654 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 14:08:23,668 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:23" (1/1) ... [2020-08-21 14:08:23,669 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:23" (1/1) ... [2020-08-21 14:08:23,677 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:23" (1/1) ... [2020-08-21 14:08:23,677 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:23" (1/1) ... [2020-08-21 14:08:23,686 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:23" (1/1) ... [2020-08-21 14:08:23,691 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:23" (1/1) ... [2020-08-21 14:08:23,693 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:23" (1/1) ... [2020-08-21 14:08:23,695 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 14:08:23,696 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 14:08:23,696 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 14:08:23,696 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 14:08:23,697 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:23" (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 [2020-08-21 14:08:23,760 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 14:08:23,761 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 14:08:23,761 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-21 14:08:23,761 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 14:08:23,761 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 14:08:23,762 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 14:08:23,763 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 14:08:23,764 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 14:08:23,764 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 14:08:23,764 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 14:08:23,765 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 14:08:23,765 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 14:08:23,765 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 14:08:23,765 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 14:08:23,765 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 14:08:23,766 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 14:08:24,076 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 14:08:24,076 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 14:08:24,081 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:08:24 BoogieIcfgContainer [2020-08-21 14:08:24,081 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 14:08:24,082 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 14:08:24,083 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 14:08:24,086 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 14:08:24,086 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 02:08:23" (1/3) ... [2020-08-21 14:08:24,087 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e3cb043 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:08:24, skipping insertion in model container [2020-08-21 14:08:24,087 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:23" (2/3) ... [2020-08-21 14:08:24,088 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e3cb043 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:08:24, skipping insertion in model container [2020-08-21 14:08:24,088 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:08:24" (3/3) ... [2020-08-21 14:08:24,090 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-21 14:08:24,101 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 14:08:24,109 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 14:08:24,125 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 14:08:24,152 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 14:08:24,152 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 14:08:24,152 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 14:08:24,152 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 14:08:24,153 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 14:08:24,153 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 14:08:24,153 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 14:08:24,153 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 14:08:24,174 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-21 14:08:24,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 14:08:24,182 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:08:24,183 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:08:24,183 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:08:24,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:08:24,194 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-21 14:08:24,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:08:24,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1693803095] [2020-08-21 14:08:24,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:08:24,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:24,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:08:24,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:24,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 14:08:24,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:24,439 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:08:24,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1693803095] [2020-08-21 14:08:24,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:08:24,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 14:08:24,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533666345] [2020-08-21 14:08:24,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 14:08:24,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:08:24,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 14:08:24,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 14:08:24,470 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-21 14:08:24,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:08:24,569 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-21 14:08:24,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 14:08:24,571 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 14:08:24,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:08:24,581 INFO L225 Difference]: With dead ends: 42 [2020-08-21 14:08:24,581 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 14:08:24,585 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 [2020-08-21 14:08:24,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 14:08:24,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 14:08:24,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 14:08:24,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-21 14:08:24,621 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-21 14:08:24,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:08:24,621 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-21 14:08:24,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 14:08:24,622 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-21 14:08:24,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 14:08:24,623 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:08:24,623 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:08:24,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 14:08:24,623 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:08:24,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:08:24,624 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-21 14:08:24,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:08:24,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1590486125] [2020-08-21 14:08:24,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:08:24,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:24,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:08:24,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:24,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 14:08:24,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:24,745 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:08:24,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1590486125] [2020-08-21 14:08:24,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:08:24,746 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 14:08:24,746 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143073264] [2020-08-21 14:08:24,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 14:08:24,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:08:24,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 14:08:24,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 14:08:24,749 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-21 14:08:24,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:08:24,814 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-21 14:08:24,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 14:08:24,815 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-21 14:08:24,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:08:24,816 INFO L225 Difference]: With dead ends: 34 [2020-08-21 14:08:24,816 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 14:08:24,817 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 [2020-08-21 14:08:24,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 14:08:24,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 14:08:24,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 14:08:24,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 14:08:24,825 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-21 14:08:24,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:08:24,825 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 14:08:24,825 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 14:08:24,825 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 14:08:24,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 14:08:24,826 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:08:24,827 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] [2020-08-21 14:08:24,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 14:08:24,827 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:08:24,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:08:24,828 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-21 14:08:24,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:08:24,829 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1314149715] [2020-08-21 14:08:24,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:08:24,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:24,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:08:24,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:24,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-21 14:08:24,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:24,908 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:08:24,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1314149715] [2020-08-21 14:08:24,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:08:24,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 14:08:24,909 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138278599] [2020-08-21 14:08:24,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 14:08:24,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:08:24,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 14:08:24,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:08:24,911 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-21 14:08:24,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:08:24,985 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-21 14:08:24,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 14:08:24,986 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-21 14:08:24,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:08:24,987 INFO L225 Difference]: With dead ends: 36 [2020-08-21 14:08:24,987 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 14:08:24,988 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 [2020-08-21 14:08:24,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 14:08:24,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 14:08:24,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 14:08:24,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-21 14:08:24,995 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-21 14:08:24,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:08:24,996 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-21 14:08:24,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 14:08:24,996 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-21 14:08:24,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 14:08:24,997 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:08:24,997 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] [2020-08-21 14:08:24,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 14:08:24,998 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:08:24,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:08:24,999 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-21 14:08:24,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:08:25,000 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1160479942] [2020-08-21 14:08:25,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:08:25,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:08:25,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-21 14:08:25,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,111 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:08:25,111 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1160479942] [2020-08-21 14:08:25,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:08:25,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 14:08:25,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199022501] [2020-08-21 14:08:25,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 14:08:25,113 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:08:25,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 14:08:25,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 14:08:25,114 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-21 14:08:25,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:08:25,195 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-21 14:08:25,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 14:08:25,195 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 14:08:25,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:08:25,208 INFO L225 Difference]: With dead ends: 38 [2020-08-21 14:08:25,208 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 14:08:25,209 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 [2020-08-21 14:08:25,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 14:08:25,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 14:08:25,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 14:08:25,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-21 14:08:25,213 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-21 14:08:25,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:08:25,214 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-21 14:08:25,214 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 14:08:25,214 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-21 14:08:25,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 14:08:25,215 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:08:25,215 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] [2020-08-21 14:08:25,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 14:08:25,216 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:08:25,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:08:25,216 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-21 14:08:25,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:08:25,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [627746003] [2020-08-21 14:08:25,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:08:25,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:08:25,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 14:08:25,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,307 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:08:25,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [627746003] [2020-08-21 14:08:25,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:08:25,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 14:08:25,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915462603] [2020-08-21 14:08:25,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 14:08:25,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:08:25,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 14:08:25,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 14:08:25,310 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-21 14:08:25,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:08:25,373 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-21 14:08:25,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 14:08:25,373 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-21 14:08:25,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:08:25,374 INFO L225 Difference]: With dead ends: 40 [2020-08-21 14:08:25,374 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 14:08:25,375 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 [2020-08-21 14:08:25,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 14:08:25,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 14:08:25,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 14:08:25,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 14:08:25,381 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-21 14:08:25,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:08:25,381 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 14:08:25,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 14:08:25,381 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 14:08:25,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 14:08:25,382 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:08:25,383 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] [2020-08-21 14:08:25,383 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 14:08:25,383 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:08:25,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:08:25,384 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-21 14:08:25,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:08:25,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2026139121] [2020-08-21 14:08:25,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:08:25,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:08:25,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-21 14:08:25,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,535 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:08:25,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2026139121] [2020-08-21 14:08:25,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:08:25,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 14:08:25,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635696677] [2020-08-21 14:08:25,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 14:08:25,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:08:25,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 14:08:25,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 14:08:25,537 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-21 14:08:25,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:08:25,601 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-21 14:08:25,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 14:08:25,601 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-21 14:08:25,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:08:25,602 INFO L225 Difference]: With dead ends: 42 [2020-08-21 14:08:25,602 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 14:08:25,603 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 [2020-08-21 14:08:25,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 14:08:25,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 14:08:25,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 14:08:25,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-21 14:08:25,608 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-21 14:08:25,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:08:25,609 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-21 14:08:25,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 14:08:25,609 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-21 14:08:25,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 14:08:25,610 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:08:25,610 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] [2020-08-21 14:08:25,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 14:08:25,610 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:08:25,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:08:25,611 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-21 14:08:25,611 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:08:25,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1206532425] [2020-08-21 14:08:25,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:08:25,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:08:25,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 14:08:25,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,717 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:08:25,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1206532425] [2020-08-21 14:08:25,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:08:25,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 14:08:25,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863872069] [2020-08-21 14:08:25,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 14:08:25,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:08:25,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 14:08:25,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 14:08:25,719 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-21 14:08:25,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:08:25,808 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-21 14:08:25,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 14:08:25,808 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-21 14:08:25,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:08:25,809 INFO L225 Difference]: With dead ends: 44 [2020-08-21 14:08:25,809 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 14:08:25,810 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 [2020-08-21 14:08:25,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 14:08:25,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 14:08:25,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 14:08:25,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-21 14:08:25,815 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-21 14:08:25,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:08:25,816 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-21 14:08:25,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 14:08:25,816 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-21 14:08:25,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 14:08:25,817 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:08:25,817 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] [2020-08-21 14:08:25,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 14:08:25,818 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:08:25,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:08:25,818 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-21 14:08:25,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:08:25,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [694830388] [2020-08-21 14:08:25,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:08:25,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:08:25,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 14:08:25,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:25,934 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:08:25,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [694830388] [2020-08-21 14:08:25,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:08:25,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 14:08:25,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035251965] [2020-08-21 14:08:25,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 14:08:25,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:08:25,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 14:08:25,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:08:25,937 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-21 14:08:26,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:08:26,028 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-21 14:08:26,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 14:08:26,028 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-21 14:08:26,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:08:26,029 INFO L225 Difference]: With dead ends: 46 [2020-08-21 14:08:26,029 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 14:08:26,030 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 [2020-08-21 14:08:26,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 14:08:26,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 14:08:26,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 14:08:26,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 14:08:26,036 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-21 14:08:26,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:08:26,037 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 14:08:26,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 14:08:26,037 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 14:08:26,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 14:08:26,038 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:08:26,039 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] [2020-08-21 14:08:26,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 14:08:26,039 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:08:26,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:08:26,040 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-21 14:08:26,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:08:26,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1329788396] [2020-08-21 14:08:26,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:08:26,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:26,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:08:26,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:26,159 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-21 14:08:26,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:26,165 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:08:26,166 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1329788396] [2020-08-21 14:08:26,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:08:26,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 14:08:26,167 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606610350] [2020-08-21 14:08:26,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 14:08:26,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:08:26,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 14:08:26,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 14:08:26,168 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 14:08:26,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:08:26,281 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 14:08:26,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 14:08:26,281 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-21 14:08:26,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:08:26,282 INFO L225 Difference]: With dead ends: 48 [2020-08-21 14:08:26,283 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 14:08:26,283 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 [2020-08-21 14:08:26,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 14:08:26,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 14:08:26,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 14:08:26,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-21 14:08:26,289 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-21 14:08:26,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:08:26,289 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-21 14:08:26,289 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 14:08:26,289 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-21 14:08:26,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 14:08:26,290 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:08:26,290 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] [2020-08-21 14:08:26,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 14:08:26,291 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:08:26,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:08:26,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-21 14:08:26,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:08:26,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1832575598] [2020-08-21 14:08:26,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:08:26,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:26,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:08:26,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:26,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 14:08:26,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:26,413 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:08:26,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1832575598] [2020-08-21 14:08:26,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:08:26,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 14:08:26,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887229836] [2020-08-21 14:08:26,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 14:08:26,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:08:26,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 14:08:26,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 14:08:26,416 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-21 14:08:26,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:08:26,506 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-21 14:08:26,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 14:08:26,507 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 14:08:26,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:08:26,508 INFO L225 Difference]: With dead ends: 50 [2020-08-21 14:08:26,508 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 14:08:26,508 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 [2020-08-21 14:08:26,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 14:08:26,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 14:08:26,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 14:08:26,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-21 14:08:26,514 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-21 14:08:26,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:08:26,514 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-21 14:08:26,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 14:08:26,515 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-21 14:08:26,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 14:08:26,515 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:08:26,516 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] [2020-08-21 14:08:26,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 14:08:26,516 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:08:26,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:08:26,516 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-21 14:08:26,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:08:26,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [753882021] [2020-08-21 14:08:26,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:08:26,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:26,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:08:26,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:26,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 14:08:26,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:26,669 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:08:26,670 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [753882021] [2020-08-21 14:08:26,670 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:08:26,670 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 14:08:26,671 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364276049] [2020-08-21 14:08:26,671 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 14:08:26,671 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:08:26,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 14:08:26,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:08:26,672 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-21 14:08:26,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:08:26,790 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-21 14:08:26,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 14:08:26,791 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 14:08:26,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:08:26,792 INFO L225 Difference]: With dead ends: 51 [2020-08-21 14:08:26,792 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 14:08:26,793 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 [2020-08-21 14:08:26,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 14:08:26,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 14:08:26,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 14:08:26,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 14:08:26,798 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-21 14:08:26,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:08:26,798 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 14:08:26,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 14:08:26,798 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 14:08:26,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 14:08:26,799 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:08:26,799 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] [2020-08-21 14:08:26,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 14:08:26,800 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:08:26,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:08:26,800 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-21 14:08:26,801 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:08:26,801 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1438557934] [2020-08-21 14:08:26,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:08:27,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:36,997 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-21 14:08:38,083 WARN L193 SmtUtils]: Spent 892.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-21 14:08:42,244 WARN L193 SmtUtils]: Spent 3.78 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-21 14:09:10,399 WARN L193 SmtUtils]: Spent 27.32 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-21 14:09:10,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:09:10,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:09:10,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 14:09:10,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:09:10,802 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:09:10,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1438557934] [2020-08-21 14:09:10,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:09:10,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 14:09:10,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769199803] [2020-08-21 14:09:10,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 14:09:10,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:09:10,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 14:09:10,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-21 14:09:10,805 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-21 14:09:11,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:09:11,285 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-21 14:09:11,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 14:09:11,286 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-21 14:09:11,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:09:11,287 INFO L225 Difference]: With dead ends: 49 [2020-08-21 14:09:11,287 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 14:09:11,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.5s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-21 14:09:11,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 14:09:11,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 14:09:11,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 14:09:11,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-21 14:09:11,295 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-21 14:09:11,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:09:11,297 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-21 14:09:11,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 14:09:11,297 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-21 14:09:11,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 14:09:11,299 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:09:11,299 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] [2020-08-21 14:09:11,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 14:09:11,300 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:09:11,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:09:11,300 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-21 14:09:11,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:09:11,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [313876557] [2020-08-21 14:09:11,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:09:11,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:09:14,931 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 8 [2020-08-21 14:09:15,319 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-21 14:09:16,368 WARN L193 SmtUtils]: Spent 841.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-21 14:09:20,605 WARN L193 SmtUtils]: Spent 3.87 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-21 14:09:20,795 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2020-08-21 14:09:21,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:09:21,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:09:21,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-21 14:09:21,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:09:21,204 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:09:21,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [313876557] [2020-08-21 14:09:21,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:09:21,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 14:09:21,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948697036] [2020-08-21 14:09:21,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 14:09:21,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:09:21,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 14:09:21,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-21 14:09:21,212 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-21 14:09:22,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:09:22,119 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 14:09:22,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 14:09:22,124 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-21 14:09:22,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:09:22,126 INFO L225 Difference]: With dead ends: 48 [2020-08-21 14:09:22,126 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 14:09:22,127 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-21 14:09:22,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 14:09:22,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 14:09:22,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 14:09:22,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-21 14:09:22,147 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-21 14:09:22,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:09:22,147 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-21 14:09:22,147 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 14:09:22,147 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-21 14:09:22,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 14:09:22,150 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:09:22,150 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] [2020-08-21 14:09:22,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 14:09:22,150 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:09:22,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:09:22,152 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-21 14:09:22,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:09:22,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1992441003] [2020-08-21 14:09:22,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:09:22,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat