/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=DEEPEST -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 21:14:36,485 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 21:14:36,488 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 21:14:36,526 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 21:14:36,526 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 21:14:36,531 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 21:14:36,532 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 21:14:36,535 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 21:14:36,536 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 21:14:36,540 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 21:14:36,541 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 21:14:36,541 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 21:14:36,544 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 21:14:36,545 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 21:14:36,545 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 21:14:36,549 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 21:14:36,549 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 21:14:36,551 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 21:14:36,553 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 21:14:36,554 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 21:14:36,556 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 21:14:36,557 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 21:14:36,559 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 21:14:36,560 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 21:14:36,566 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 21:14:36,583 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 21:14:36,587 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 21:14:36,588 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 21:14:36,589 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 21:14:36,610 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 21:14:36,611 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 21:14:36,612 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 21:14:36,612 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 21:14:36,612 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 21:14:36,612 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 21:14:36,613 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 21:14:36,613 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 21:14:36,613 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 21:14:36,613 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 21:14:36,613 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 21:14:36,614 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 21:14:36,614 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 21:14:36,614 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 21:14:36,614 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 21:14:36,614 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 21:14:36,614 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 21:14:36,615 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 21:14:36,615 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 21:14:36,615 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 21:14:36,615 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 21:14:36,615 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:14:36,616 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 21:14:36,616 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 21:14:36,616 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 21:14:36,616 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 21:14:36,616 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 21:14:36,617 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 21:14:36,617 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 21:14:36,617 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=DEEPEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=DEEPEST; [2020-08-18 21:14:36,894 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 21:14:36,906 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 21:14:36,909 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 21:14:36,911 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 21:14:36,911 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 21:14:36,912 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-18 21:14:36,970 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4da4d8967/826619d4daa94adab23d4640d8d4c15f/FLAGb447d0905 [2020-08-18 21:14:37,347 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 21:14:37,349 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-18 21:14:37,355 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4da4d8967/826619d4daa94adab23d4640d8d4c15f/FLAGb447d0905 [2020-08-18 21:14:37,726 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4da4d8967/826619d4daa94adab23d4640d8d4c15f [2020-08-18 21:14:37,736 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 21:14:37,739 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 21:14:37,740 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 21:14:37,741 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 21:14:37,746 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 21:14:37,747 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:14:37" (1/1) ... [2020-08-18 21:14:37,751 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fe964b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:37, skipping insertion in model container [2020-08-18 21:14:37,751 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:14:37" (1/1) ... [2020-08-18 21:14:37,759 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 21:14:37,778 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 21:14:37,980 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:14:37,983 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 21:14:38,001 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:14:38,015 INFO L208 MainTranslator]: Completed translation [2020-08-18 21:14:38,016 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:38 WrapperNode [2020-08-18 21:14:38,016 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 21:14:38,017 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 21:14:38,017 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 21:14:38,017 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 21:14:38,029 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:38" (1/1) ... [2020-08-18 21:14:38,029 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:38" (1/1) ... [2020-08-18 21:14:38,033 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:38" (1/1) ... [2020-08-18 21:14:38,034 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:38" (1/1) ... [2020-08-18 21:14:38,116 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:38" (1/1) ... [2020-08-18 21:14:38,122 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:38" (1/1) ... [2020-08-18 21:14:38,123 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:38" (1/1) ... [2020-08-18 21:14:38,130 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 21:14:38,130 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 21:14:38,130 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 21:14:38,131 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 21:14:38,131 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:38" (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 21:14:38,184 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 21:14:38,184 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 21:14:38,184 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 21:14:38,184 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 21:14:38,184 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 21:14:38,185 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 21:14:38,185 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 21:14:38,185 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 21:14:38,185 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 21:14:38,185 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 21:14:38,185 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 21:14:38,186 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 21:14:38,186 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 21:14:38,549 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 21:14:38,550 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 21:14:38,553 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:14:38 BoogieIcfgContainer [2020-08-18 21:14:38,553 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 21:14:38,555 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 21:14:38,555 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 21:14:38,558 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 21:14:38,558 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 09:14:37" (1/3) ... [2020-08-18 21:14:38,559 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26dafe32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:14:38, skipping insertion in model container [2020-08-18 21:14:38,559 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:38" (2/3) ... [2020-08-18 21:14:38,560 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26dafe32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:14:38, skipping insertion in model container [2020-08-18 21:14:38,560 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:14:38" (3/3) ... [2020-08-18 21:14:38,562 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-18 21:14:38,572 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 21:14:38,579 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 21:14:38,592 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 21:14:38,628 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 21:14:38,629 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 21:14:38,629 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 21:14:38,629 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 21:14:38,629 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 21:14:38,630 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 21:14:38,632 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 21:14:38,632 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 21:14:38,651 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-18 21:14:38,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 21:14:38,656 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:38,657 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:38,658 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:38,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:38,662 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-18 21:14:38,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:38,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1351794483] [2020-08-18 21:14:38,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:38,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:38,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:38,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:38,782 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 21:14:38,783 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1351794483] [2020-08-18 21:14:38,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:14:38,785 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 21:14:38,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336860014] [2020-08-18 21:14:38,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 21:14:38,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:38,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 21:14:38,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 21:14:38,807 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-18 21:14:38,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:38,829 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-18 21:14:38,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 21:14:38,831 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-18 21:14:38,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:38,840 INFO L225 Difference]: With dead ends: 35 [2020-08-18 21:14:38,840 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 21:14:38,844 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 21:14:38,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 21:14:38,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 21:14:38,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 21:14:38,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 21:14:38,880 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-18 21:14:38,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:38,880 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 21:14:38,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 21:14:38,881 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 21:14:38,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 21:14:38,881 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:38,881 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:38,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 21:14:38,882 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:38,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:38,883 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-18 21:14:38,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:38,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2074062115] [2020-08-18 21:14:38,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:38,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:38,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:38,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:38,931 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 21:14:38,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2074062115] [2020-08-18 21:14:38,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:14:38,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 21:14:38,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069454056] [2020-08-18 21:14:38,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 21:14:38,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:38,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 21:14:38,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 21:14:38,935 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-18 21:14:38,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:38,950 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-18 21:14:38,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 21:14:38,951 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-18 21:14:38,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:38,952 INFO L225 Difference]: With dead ends: 24 [2020-08-18 21:14:38,952 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 21:14:38,953 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 21:14:38,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 21:14:38,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 21:14:38,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 21:14:38,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-18 21:14:38,957 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-18 21:14:38,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:38,958 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-18 21:14:38,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 21:14:38,958 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-18 21:14:38,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 21:14:38,959 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:38,959 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:38,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 21:14:38,960 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:38,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:38,960 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-18 21:14:38,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:38,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937278304] [2020-08-18 21:14:38,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:38,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:39,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:39,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:39,277 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 21:14:39,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937278304] [2020-08-18 21:14:39,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:14:39,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 21:14:39,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240185904] [2020-08-18 21:14:39,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:14:39,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:39,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:14:39,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:14:39,284 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-18 21:14:39,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:39,338 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-18 21:14:39,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 21:14:39,339 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-18 21:14:39,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:39,340 INFO L225 Difference]: With dead ends: 23 [2020-08-18 21:14:39,341 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 21:14:39,341 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 21:14:39,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 21:14:39,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 21:14:39,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 21:14:39,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-18 21:14:39,348 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-18 21:14:39,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:39,348 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-18 21:14:39,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:14:39,349 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-18 21:14:39,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 21:14:39,350 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:39,350 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:39,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 21:14:39,350 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:39,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:39,351 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-18 21:14:39,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:39,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2132977897] [2020-08-18 21:14:39,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:39,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:39,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:39,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:39,524 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 21:14:39,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2132977897] [2020-08-18 21:14:39,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:14:39,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 21:14:39,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500186881] [2020-08-18 21:14:39,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 21:14:39,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:39,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 21:14:39,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 21:14:39,527 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-18 21:14:39,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:39,547 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-18 21:14:39,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 21:14:39,548 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-18 21:14:39,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:39,549 INFO L225 Difference]: With dead ends: 26 [2020-08-18 21:14:39,549 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 21:14:39,550 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 21:14:39,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 21:14:39,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 21:14:39,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 21:14:39,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 21:14:39,554 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-18 21:14:39,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:39,555 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 21:14:39,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 21:14:39,555 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 21:14:39,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 21:14:39,556 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:39,556 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:39,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 21:14:39,556 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:39,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:39,557 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-18 21:14:39,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:39,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1437340773] [2020-08-18 21:14:39,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:39,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:39,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:39,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:39,774 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 21:14:39,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1437340773] [2020-08-18 21:14:39,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:39,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 21:14:39,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526275285] [2020-08-18 21:14:39,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 21:14:39,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:39,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 21:14:39,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:14:39,793 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-18 21:14:39,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:39,911 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 21:14:39,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:14:39,912 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-18 21:14:39,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:39,913 INFO L225 Difference]: With dead ends: 26 [2020-08-18 21:14:39,913 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 21:14:39,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 21:14:39,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 21:14:39,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 21:14:39,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 21:14:39,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 21:14:39,923 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-18 21:14:39,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:39,923 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 21:14:39,924 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 21:14:39,924 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 21:14:39,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 21:14:39,925 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:39,925 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:39,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 21:14:39,926 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:39,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:39,926 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-18 21:14:39,926 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:39,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1806659039] [2020-08-18 21:14:39,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:39,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:40,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:40,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:40,155 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 21:14:40,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1806659039] [2020-08-18 21:14:40,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:40,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 21:14:40,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701455981] [2020-08-18 21:14:40,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 21:14:40,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:40,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 21:14:40,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:14:40,158 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-18 21:14:40,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:40,282 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 21:14:40,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 21:14:40,282 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-18 21:14:40,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:40,283 INFO L225 Difference]: With dead ends: 29 [2020-08-18 21:14:40,283 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 21:14:40,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:14:40,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 21:14:40,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 21:14:40,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 21:14:40,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 21:14:40,288 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-18 21:14:40,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:40,289 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 21:14:40,289 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 21:14:40,289 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 21:14:40,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 21:14:40,290 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:40,290 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:40,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 21:14:40,290 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:40,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:40,291 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-18 21:14:40,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:40,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [672279936] [2020-08-18 21:14:40,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:40,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:40,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:40,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:40,532 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 21:14:40,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [672279936] [2020-08-18 21:14:40,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:40,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 21:14:40,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695839303] [2020-08-18 21:14:40,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 21:14:40,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:40,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 21:14:40,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:14:40,535 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-18 21:14:46,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:46,978 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 21:14:46,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 21:14:46,979 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-18 21:14:46,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:46,980 INFO L225 Difference]: With dead ends: 32 [2020-08-18 21:14:46,981 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 21:14:46,981 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 21:14:46,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 21:14:46,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 21:14:46,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 21:14:46,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 21:14:46,987 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-18 21:14:46,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:46,987 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 21:14:46,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 21:14:46,988 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 21:14:46,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 21:14:46,989 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:46,989 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:46,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 21:14:46,990 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:46,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:46,990 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-18 21:14:46,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:46,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [416258897] [2020-08-18 21:14:46,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:47,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:47,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:47,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:47,323 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 21:14:47,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [416258897] [2020-08-18 21:14:47,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:47,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 21:14:47,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534948240] [2020-08-18 21:14:47,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 21:14:47,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:47,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 21:14:47,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:14:47,329 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-18 21:14:47,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:47,559 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 21:14:47,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 21:14:47,559 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-18 21:14:47,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:47,560 INFO L225 Difference]: With dead ends: 35 [2020-08-18 21:14:47,561 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 21:14:47,562 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 21:14:47,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 21:14:47,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 21:14:47,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 21:14:47,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 21:14:47,568 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-18 21:14:47,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:47,569 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 21:14:47,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 21:14:47,569 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 21:14:47,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 21:14:47,570 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:47,570 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:47,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 21:14:47,571 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:47,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:47,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-18 21:14:47,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:47,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [718056924] [2020-08-18 21:14:47,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:47,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:47,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:47,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:47,980 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 21:14:47,980 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [718056924] [2020-08-18 21:14:47,981 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:47,981 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 21:14:47,981 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610228207] [2020-08-18 21:14:47,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 21:14:47,982 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:47,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 21:14:47,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-18 21:14:47,982 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-18 21:14:52,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:52,424 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 21:14:52,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 21:14:52,425 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-18 21:14:52,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:52,426 INFO L225 Difference]: With dead ends: 38 [2020-08-18 21:14:52,426 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 21:14:52,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2020-08-18 21:14:52,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 21:14:52,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 21:14:52,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 21:14:52,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 21:14:52,431 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-18 21:14:52,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:52,432 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 21:14:52,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 21:14:52,432 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 21:14:52,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 21:14:52,433 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:52,433 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:52,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 21:14:52,433 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:52,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:52,434 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-18 21:14:52,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:52,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836733872] [2020-08-18 21:14:52,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:52,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:52,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:52,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:52,921 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 21:14:52,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836733872] [2020-08-18 21:14:52,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:52,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 21:14:52,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534510690] [2020-08-18 21:14:52,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 21:14:52,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:52,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 21:14:52,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-18 21:14:52,924 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-18 21:14:53,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:53,609 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 21:14:53,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 21:14:53,611 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-18 21:14:53,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:53,612 INFO L225 Difference]: With dead ends: 41 [2020-08-18 21:14:53,612 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 21:14:53,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2020-08-18 21:14:53,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 21:14:53,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 21:14:53,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 21:14:53,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 21:14:53,617 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-18 21:14:53,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:53,618 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 21:14:53,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 21:14:53,618 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 21:14:53,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 21:14:53,619 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:53,619 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:53,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 21:14:53,619 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:53,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:53,620 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-18 21:14:53,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:53,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [307710094] [2020-08-18 21:14:53,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:53,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:54,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:54,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:54,132 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 21:14:54,132 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [307710094] [2020-08-18 21:14:54,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:54,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 21:14:54,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528483924] [2020-08-18 21:14:54,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 21:14:54,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:54,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 21:14:54,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-18 21:14:54,134 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-18 21:15:11,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:15:11,839 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 21:15:11,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 21:15:11,839 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-18 21:15:11,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:15:11,841 INFO L225 Difference]: With dead ends: 44 [2020-08-18 21:15:11,841 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 21:15:11,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=49, Invalid=410, Unknown=3, NotChecked=0, Total=462 [2020-08-18 21:15:11,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 21:15:11,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 21:15:11,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 21:15:11,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 21:15:11,847 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-18 21:15:11,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:15:11,848 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 21:15:11,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 21:15:11,848 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 21:15:11,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 21:15:11,849 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:15:11,850 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:15:11,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 21:15:11,850 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:15:11,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:15:11,850 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-18 21:15:11,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:15:11,851 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1651171673] [2020-08-18 21:15:11,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:15:11,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:15:12,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:15:12,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:15:12,456 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 21:15:12,456 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1651171673] [2020-08-18 21:15:12,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:15:12,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 21:15:12,457 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442044051] [2020-08-18 21:15:12,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 21:15:12,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:15:12,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 21:15:12,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-18 21:15:12,460 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-18 21:15:12,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:15:12,912 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 21:15:12,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 21:15:12,913 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-18 21:15:12,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:15:12,914 INFO L225 Difference]: With dead ends: 47 [2020-08-18 21:15:12,915 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 21:15:12,915 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 21:15:12,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 21:15:12,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 21:15:12,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 21:15:12,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 21:15:12,920 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-18 21:15:12,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:15:12,920 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 21:15:12,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 21:15:12,920 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 21:15:12,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 21:15:12,921 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:15:12,921 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:15:12,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 21:15:12,922 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:15:12,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:15:12,922 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-18 21:15:12,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:15:12,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [770618625] [2020-08-18 21:15:12,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:15:12,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:15:13,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:15:13,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:15:13,617 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 21:15:13,617 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [770618625] [2020-08-18 21:15:13,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:15:13,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 21:15:13,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210937621] [2020-08-18 21:15:13,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 21:15:13,618 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:15:13,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 21:15:13,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-18 21:15:13,619 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-18 21:15:24,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:15:24,549 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 21:15:24,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 21:15:24,550 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-18 21:15:24,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:15:24,551 INFO L225 Difference]: With dead ends: 50 [2020-08-18 21:15:24,551 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 21:15:24,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=57, Invalid=591, Unknown=2, NotChecked=0, Total=650 [2020-08-18 21:15:24,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 21:15:24,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 21:15:24,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 21:15:24,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 21:15:24,560 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-18 21:15:24,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:15:24,561 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 21:15:24,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 21:15:24,561 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 21:15:24,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 21:15:24,562 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:15:24,562 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:15:24,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 21:15:24,562 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:15:24,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:15:24,563 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-18 21:15:24,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:15:24,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [303144913] [2020-08-18 21:15:24,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:15:24,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:15:25,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:15:25,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:15:25,389 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 21:15:25,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [303144913] [2020-08-18 21:15:25,389 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:15:25,389 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 21:15:25,390 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654968438] [2020-08-18 21:15:25,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 21:15:25,390 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:15:25,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 21:15:25,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-18 21:15:25,391 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states. [2020-08-18 21:15:48,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:15:48,954 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 21:15:48,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 21:15:48,955 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 43 [2020-08-18 21:15:48,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:15:48,955 INFO L225 Difference]: With dead ends: 53 [2020-08-18 21:15:48,956 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 21:15:48,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=61, Invalid=690, Unknown=5, NotChecked=0, Total=756 [2020-08-18 21:15:48,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 21:15:48,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 21:15:48,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 21:15:48,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 21:15:48,961 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2020-08-18 21:15:48,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:15:48,961 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 21:15:48,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 21:15:48,962 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 21:15:48,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 21:15:48,962 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:15:48,962 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:15:48,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 21:15:48,963 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:15:48,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:15:48,963 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 11 times [2020-08-18 21:15:48,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:15:48,964 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [577463742] [2020-08-18 21:15:48,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:15:48,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:15:49,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:15:49,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:15:49,848 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 21:15:49,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [577463742] [2020-08-18 21:15:49,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:15:49,849 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 21:15:49,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340886114] [2020-08-18 21:15:49,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 21:15:49,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:15:49,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 21:15:49,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-18 21:15:49,850 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 27 states.