/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 enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 19:37:54,554 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 19:37:54,557 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 19:37:54,598 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 19:37:54,598 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 19:37:54,606 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 19:37:54,609 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 19:37:54,612 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 19:37:54,615 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 19:37:54,618 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 19:37:54,619 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 19:37:54,620 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 19:37:54,620 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 19:37:54,623 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 19:37:54,626 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 19:37:54,628 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 19:37:54,629 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 19:37:54,630 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 19:37:54,632 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 19:37:54,659 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 19:37:54,663 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 19:37:54,665 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 19:37:54,666 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 19:37:54,667 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 19:37:54,679 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 19:37:54,689 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 19:37:54,690 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 19:37:54,691 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 19:37:54,692 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 [2020-08-18 19:37:54,732 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 19:37:54,732 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 19:37:54,734 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 19:37:54,735 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 19:37:54,735 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 19:37:54,735 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 19:37:54,735 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 19:37:54,736 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 19:37:54,736 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 19:37:54,736 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 19:37:54,737 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 19:37:54,737 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 19:37:54,738 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 19:37:54,738 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 19:37:54,738 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 19:37:54,738 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 19:37:54,739 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 19:37:54,739 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 19:37:54,739 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 19:37:54,739 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 19:37:54,740 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 19:37:54,740 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 19:37:54,740 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 19:37:54,740 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 19:37:54,740 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 19:37:54,740 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 19:37:54,741 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 19:37:54,741 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 19:37:54,741 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 19:37:54,741 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 -> enumeration-timeout=5;interpolation-heuristic=HIGHLEXORDER; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=HIGHLEXORDER; [2020-08-18 19:37:55,051 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 19:37:55,063 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 19:37:55,066 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 19:37:55,067 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 19:37:55,067 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 19:37:55,068 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-18 19:37:55,127 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5ca0a65b9/2111f4ac3a284cd6829ffc201ba50ca5/FLAG84d9a3199 [2020-08-18 19:37:55,610 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 19:37:55,611 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-18 19:37:55,618 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5ca0a65b9/2111f4ac3a284cd6829ffc201ba50ca5/FLAG84d9a3199 [2020-08-18 19:37:56,003 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5ca0a65b9/2111f4ac3a284cd6829ffc201ba50ca5 [2020-08-18 19:37:56,013 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 19:37:56,015 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 19:37:56,016 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 19:37:56,016 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 19:37:56,020 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 19:37:56,021 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:37:56" (1/1) ... [2020-08-18 19:37:56,024 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@770ea115 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:56, skipping insertion in model container [2020-08-18 19:37:56,024 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:37:56" (1/1) ... [2020-08-18 19:37:56,031 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 19:37:56,050 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 19:37:56,268 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 19:37:56,272 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 19:37:56,286 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 19:37:56,301 INFO L208 MainTranslator]: Completed translation [2020-08-18 19:37:56,302 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:56 WrapperNode [2020-08-18 19:37:56,302 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 19:37:56,303 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 19:37:56,303 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 19:37:56,303 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 19:37:56,313 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:56" (1/1) ... [2020-08-18 19:37:56,314 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:56" (1/1) ... [2020-08-18 19:37:56,396 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:56" (1/1) ... [2020-08-18 19:37:56,396 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:56" (1/1) ... [2020-08-18 19:37:56,399 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:56" (1/1) ... [2020-08-18 19:37:56,404 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:56" (1/1) ... [2020-08-18 19:37:56,405 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:56" (1/1) ... [2020-08-18 19:37:56,407 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 19:37:56,407 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 19:37:56,408 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 19:37:56,408 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 19:37:56,409 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:56" (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 [2020-08-18 19:37:56,466 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 19:37:56,467 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 19:37:56,467 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 19:37:56,467 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 19:37:56,467 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 19:37:56,467 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 19:37:56,467 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 19:37:56,468 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 19:37:56,468 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 19:37:56,468 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 19:37:56,468 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 19:37:56,468 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 19:37:56,468 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 19:37:56,719 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 19:37:56,720 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 19:37:56,729 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:37:56 BoogieIcfgContainer [2020-08-18 19:37:56,729 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 19:37:56,734 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 19:37:56,734 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 19:37:56,741 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 19:37:56,741 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 07:37:56" (1/3) ... [2020-08-18 19:37:56,746 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b5ddd51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:37:56, skipping insertion in model container [2020-08-18 19:37:56,746 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:56" (2/3) ... [2020-08-18 19:37:56,746 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b5ddd51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:37:56, skipping insertion in model container [2020-08-18 19:37:56,746 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:37:56" (3/3) ... [2020-08-18 19:37:56,750 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-18 19:37:56,773 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 19:37:56,780 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 19:37:56,794 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 19:37:56,819 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 19:37:56,819 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 19:37:56,819 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 19:37:56,819 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 19:37:56,819 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 19:37:56,819 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 19:37:56,819 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 19:37:56,820 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 19:37:56,834 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-18 19:37:56,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 19:37:56,840 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:56,841 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:56,842 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:56,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:56,847 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-18 19:37:56,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:56,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1353626454] [2020-08-18 19:37:56,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:56,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:56,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,968 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:56,969 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1353626454] [2020-08-18 19:37:56,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:37:56,971 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 19:37:56,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793612918] [2020-08-18 19:37:56,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 19:37:56,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:56,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 19:37:56,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 19:37:56,995 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-18 19:37:57,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:57,019 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-18 19:37:57,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 19:37:57,020 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-18 19:37:57,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:57,030 INFO L225 Difference]: With dead ends: 35 [2020-08-18 19:37:57,031 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 19:37:57,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 19:37:57,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 19:37:57,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 19:37:57,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 19:37:57,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 19:37:57,076 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-18 19:37:57,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:57,076 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 19:37:57,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 19:37:57,077 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 19:37:57,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 19:37:57,078 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:57,078 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:57,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 19:37:57,078 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:57,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:57,079 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-18 19:37:57,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:57,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [576150110] [2020-08-18 19:37:57,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:57,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:57,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,127 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:57,127 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [576150110] [2020-08-18 19:37:57,128 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:37:57,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 19:37:57,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049446508] [2020-08-18 19:37:57,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 19:37:57,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:57,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 19:37:57,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 19:37:57,131 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-18 19:37:57,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:57,151 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-18 19:37:57,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 19:37:57,152 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-18 19:37:57,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:57,153 INFO L225 Difference]: With dead ends: 24 [2020-08-18 19:37:57,153 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 19:37:57,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 19:37:57,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 19:37:57,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 19:37:57,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 19:37:57,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-18 19:37:57,158 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-18 19:37:57,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:57,159 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-18 19:37:57,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 19:37:57,159 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-18 19:37:57,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 19:37:57,160 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:57,160 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:57,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 19:37:57,161 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:57,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:57,161 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-18 19:37:57,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:57,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2086325165] [2020-08-18 19:37:57,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:57,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:57,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,412 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:57,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2086325165] [2020-08-18 19:37:57,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:37:57,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 19:37:57,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402502483] [2020-08-18 19:37:57,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 19:37:57,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:57,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 19:37:57,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:37:57,415 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-18 19:37:57,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:57,451 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-18 19:37:57,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 19:37:57,452 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-18 19:37:57,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:57,453 INFO L225 Difference]: With dead ends: 23 [2020-08-18 19:37:57,453 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 19:37:57,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 19:37:57,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 19:37:57,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 19:37:57,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 19:37:57,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-18 19:37:57,459 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-18 19:37:57,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:57,460 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-18 19:37:57,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 19:37:57,460 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-18 19:37:57,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 19:37:57,461 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:57,461 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:57,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 19:37:57,461 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:57,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:57,462 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-18 19:37:57,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:57,463 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [414944314] [2020-08-18 19:37:57,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:57,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:57,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,689 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:57,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [414944314] [2020-08-18 19:37:57,689 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:37:57,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 19:37:57,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390356596] [2020-08-18 19:37:57,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 19:37:57,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:57,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 19:37:57,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 19:37:57,691 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-18 19:37:57,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:57,713 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-18 19:37:57,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 19:37:57,714 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-18 19:37:57,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:57,715 INFO L225 Difference]: With dead ends: 26 [2020-08-18 19:37:57,715 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 19:37:57,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 19:37:57,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 19:37:57,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 19:37:57,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 19:37:57,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 19:37:57,721 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-18 19:37:57,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:57,721 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 19:37:57,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 19:37:57,722 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 19:37:57,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 19:37:57,722 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:57,723 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:57,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 19:37:57,723 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:57,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:57,724 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-18 19:37:57,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:57,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [605798198] [2020-08-18 19:37:57,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:57,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:57,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,972 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:57,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [605798198] [2020-08-18 19:37:57,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:57,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 19:37:57,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618977781] [2020-08-18 19:37:57,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 19:37:57,975 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:57,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 19:37:57,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 19:37:57,976 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-18 19:37:58,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:58,101 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 19:37:58,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 19:37:58,102 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-18 19:37:58,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:58,103 INFO L225 Difference]: With dead ends: 26 [2020-08-18 19:37:58,103 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 19:37:58,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 19:37:58,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 19:37:58,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 19:37:58,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 19:37:58,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 19:37:58,109 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-18 19:37:58,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:58,109 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 19:37:58,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 19:37:58,110 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 19:37:58,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 19:37:58,110 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:58,111 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:58,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 19:37:58,111 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:58,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:58,112 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-18 19:37:58,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:58,112 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1883588371] [2020-08-18 19:37:58,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:58,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:58,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:58,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:58,339 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:58,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1883588371] [2020-08-18 19:37:58,340 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:58,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 19:37:58,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278879554] [2020-08-18 19:37:58,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 19:37:58,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:58,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 19:37:58,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-18 19:37:58,342 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-18 19:37:58,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:58,482 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 19:37:58,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 19:37:58,483 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-18 19:37:58,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:58,484 INFO L225 Difference]: With dead ends: 29 [2020-08-18 19:37:58,484 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 19:37:58,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-18 19:37:58,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 19:37:58,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 19:37:58,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 19:37:58,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 19:37:58,490 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-18 19:37:58,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:58,490 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 19:37:58,490 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 19:37:58,490 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 19:37:58,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 19:37:58,491 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:58,491 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:58,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 19:37:58,492 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:58,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:58,492 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-18 19:37:58,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:58,493 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1934189373] [2020-08-18 19:37:58,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:58,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:58,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:58,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:58,829 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:58,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1934189373] [2020-08-18 19:37:58,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:58,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 19:37:58,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244394271] [2020-08-18 19:37:58,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 19:37:58,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:58,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 19:37:58,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-18 19:37:58,834 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-18 19:38:05,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:05,280 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 19:38:05,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 19:38:05,281 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-18 19:38:05,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:05,282 INFO L225 Difference]: With dead ends: 32 [2020-08-18 19:38:05,283 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 19:38:05,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=33, Invalid=147, Unknown=2, NotChecked=0, Total=182 [2020-08-18 19:38:05,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 19:38:05,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 19:38:05,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 19:38:05,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 19:38:05,294 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-18 19:38:05,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:05,294 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 19:38:05,294 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 19:38:05,294 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 19:38:05,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 19:38:05,295 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:05,295 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:05,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 19:38:05,297 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:05,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:05,298 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-18 19:38:05,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:05,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050350041] [2020-08-18 19:38:05,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:05,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:05,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:05,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:05,675 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:05,676 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050350041] [2020-08-18 19:38:05,676 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:05,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 19:38:05,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284219918] [2020-08-18 19:38:05,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 19:38:05,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:05,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 19:38:05,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 19:38:05,678 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-18 19:38:05,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:05,909 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 19:38:05,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 19:38:05,910 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-18 19:38:05,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:05,911 INFO L225 Difference]: With dead ends: 35 [2020-08-18 19:38:05,911 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 19:38:05,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2020-08-18 19:38:05,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 19:38:05,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 19:38:05,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 19:38:05,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 19:38:05,920 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-18 19:38:05,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:05,921 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 19:38:05,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 19:38:05,921 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 19:38:05,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 19:38:05,922 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:05,922 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:05,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 19:38:05,923 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:05,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:05,925 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-18 19:38:05,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:05,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1094786935] [2020-08-18 19:38:05,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:05,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:06,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:06,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:06,303 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:06,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1094786935] [2020-08-18 19:38:06,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:06,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 19:38:06,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976132724] [2020-08-18 19:38:06,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 19:38:06,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:06,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 19:38:06,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-18 19:38:06,309 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-18 19:38:17,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:17,093 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 19:38:17,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 19:38:17,093 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-18 19:38:17,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:17,094 INFO L225 Difference]: With dead ends: 38 [2020-08-18 19:38:17,094 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 19:38:17,097 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=49, Invalid=329, Unknown=2, NotChecked=0, Total=380 [2020-08-18 19:38:17,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 19:38:17,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 19:38:17,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 19:38:17,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 19:38:17,106 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-18 19:38:17,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:17,106 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 19:38:17,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 19:38:17,107 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 19:38:17,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 19:38:17,109 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:17,109 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:17,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 19:38:17,111 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:17,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:17,111 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-18 19:38:17,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:17,112 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450854209] [2020-08-18 19:38:17,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:17,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:17,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:17,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:17,599 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:17,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450854209] [2020-08-18 19:38:17,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:17,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 19:38:17,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567088979] [2020-08-18 19:38:17,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 19:38:17,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:17,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 19:38:17,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-18 19:38:17,603 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-18 19:38:24,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:24,232 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 19:38:24,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 19:38:24,232 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-18 19:38:24,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:24,233 INFO L225 Difference]: With dead ends: 41 [2020-08-18 19:38:24,233 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 19:38:24,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-18 19:38:24,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 19:38:24,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 19:38:24,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 19:38:24,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 19:38:24,245 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-18 19:38:24,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:24,245 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 19:38:24,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 19:38:24,245 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 19:38:24,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 19:38:24,246 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:24,246 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:24,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 19:38:24,247 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:24,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:24,248 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-18 19:38:24,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:24,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1625017034] [2020-08-18 19:38:24,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:24,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:24,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:24,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:24,784 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:24,784 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1625017034] [2020-08-18 19:38:24,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:24,785 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 19:38:24,785 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280699753] [2020-08-18 19:38:24,785 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 19:38:24,786 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:24,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 19:38:24,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-18 19:38:24,786 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-18 19:38:33,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:33,741 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 19:38:33,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 19:38:33,742 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-18 19:38:33,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:33,743 INFO L225 Difference]: With dead ends: 44 [2020-08-18 19:38:33,743 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 19:38:33,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=49, Invalid=412, Unknown=1, NotChecked=0, Total=462 [2020-08-18 19:38:33,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 19:38:33,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 19:38:33,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 19:38:33,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 19:38:33,749 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-18 19:38:33,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:33,750 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 19:38:33,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 19:38:33,750 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 19:38:33,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 19:38:33,751 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:33,751 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:33,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 19:38:33,752 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:33,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:33,752 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-18 19:38:33,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:33,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1679226891] [2020-08-18 19:38:33,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:33,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:34,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:34,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:34,408 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:34,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1679226891] [2020-08-18 19:38:34,409 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:34,409 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 19:38:34,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498322789] [2020-08-18 19:38:34,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 19:38:34,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:34,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 19:38:34,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-18 19:38:34,411 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-18 19:38:34,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:34,949 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 19:38:34,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 19:38:34,950 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-18 19:38:34,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:34,951 INFO L225 Difference]: With dead ends: 47 [2020-08-18 19:38:34,952 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 19:38:34,953 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-18 19:38:34,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 19:38:34,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 19:38:34,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 19:38:34,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 19:38:34,957 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-18 19:38:34,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:34,957 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 19:38:34,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 19:38:34,958 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 19:38:34,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 19:38:34,958 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:34,959 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:34,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 19:38:34,959 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:34,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:34,959 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-18 19:38:34,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:34,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [663600049] [2020-08-18 19:38:34,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:34,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:35,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:35,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:35,788 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:35,789 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [663600049] [2020-08-18 19:38:35,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:35,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 19:38:35,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421660701] [2020-08-18 19:38:35,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 19:38:35,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:35,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 19:38:35,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-18 19:38:35,792 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-18 19:38:46,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:46,798 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 19:38:46,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 19:38:46,799 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-18 19:38:46,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:46,801 INFO L225 Difference]: With dead ends: 50 [2020-08-18 19:38:46,801 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 19:38:46,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=57, Invalid=590, Unknown=3, NotChecked=0, Total=650 [2020-08-18 19:38:46,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 19:38:46,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 19:38:46,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 19:38:46,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 19:38:46,809 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-18 19:38:46,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:46,810 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 19:38:46,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 19:38:46,811 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 19:38:46,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 19:38:46,812 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:46,813 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:46,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 19:38:46,814 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:46,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:46,815 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-18 19:38:46,815 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:46,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [744270386] [2020-08-18 19:38:46,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:46,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:47,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:47,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:47,789 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:47,790 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [744270386] [2020-08-18 19:38:47,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:47,790 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 19:38:47,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683196570] [2020-08-18 19:38:47,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 19:38:47,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:47,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 19:38:47,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-18 19:38:47,793 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states. [2020-08-18 19:39:09,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:39:09,338 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 19:39:09,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 19:39:09,339 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 43 [2020-08-18 19:39:09,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:39:09,340 INFO L225 Difference]: With dead ends: 53 [2020-08-18 19:39:09,341 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 19:39:09,342 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=61, Invalid=691, Unknown=4, NotChecked=0, Total=756 [2020-08-18 19:39:09,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 19:39:09,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 19:39:09,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 19:39:09,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 19:39:09,346 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2020-08-18 19:39:09,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:39:09,346 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 19:39:09,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 19:39:09,346 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 19:39:09,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 19:39:09,347 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:39:09,347 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:39:09,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 19:39:09,348 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:39:09,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:39:09,348 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 11 times [2020-08-18 19:39:09,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:39:09,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1356590250] [2020-08-18 19:39:09,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:39:09,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:39:10,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:39:10,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:39:10,362 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:39:10,362 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1356590250] [2020-08-18 19:39:10,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:39:10,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 19:39:10,363 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884647470] [2020-08-18 19:39:10,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 19:39:10,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:39:10,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 19:39:10,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-18 19:39:10,365 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 27 states.