/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 10:29:08,677 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:29:08,681 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:29:08,708 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:29:08,709 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:29:08,710 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:29:08,712 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:29:08,714 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:29:08,716 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:29:08,717 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:29:08,718 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:29:08,719 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:29:08,720 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:29:08,721 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:29:08,723 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:29:08,724 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:29:08,725 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:29:08,727 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:29:08,729 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:29:08,731 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:29:08,733 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:29:08,734 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:29:08,736 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:29:08,737 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:29:08,740 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-21 10:29:08,740 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-21 10:29:08,740 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-21 10:29:08,742 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-21 10:29:08,742 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-21 10:29:08,743 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-21 10:29:08,744 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-21 10:29:08,745 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-21 10:29:08,746 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-21 10:29:08,747 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-21 10:29:08,748 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-21 10:29:08,748 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-21 10:29:08,749 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-21 10:29:08,750 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-21 10:29:08,750 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:29:08,751 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:29:08,752 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:29:08,753 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-21 10:29:08,780 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:29:08,781 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:29:08,782 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:29:08,782 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:29:08,783 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:29:08,783 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:29:08,783 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:29:08,783 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:29:08,783 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:29:08,784 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:29:08,784 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:29:08,784 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:29:08,784 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:29:08,785 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:29:08,785 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:29:08,785 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:29:08,785 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:29:08,785 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:29:08,786 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:29:08,786 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:29:08,786 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:29:08,786 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:29:08,787 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:29:08,787 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:29:08,787 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:29:08,787 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:29:08,787 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:29:08,788 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:29:08,788 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:29:08,788 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false [2020-09-21 10:29:09,340 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:29:09,370 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:29:09,377 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:29:09,379 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:29:09,380 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:29:09,382 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-09-21 10:29:09,494 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c6fe65c4c/660ef0c019924992a9b25398ac3b6e35/FLAG76b5cc34b [2020-09-21 10:29:10,052 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:29:10,053 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-09-21 10:29:10,062 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c6fe65c4c/660ef0c019924992a9b25398ac3b6e35/FLAG76b5cc34b [2020-09-21 10:29:10,396 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c6fe65c4c/660ef0c019924992a9b25398ac3b6e35 [2020-09-21 10:29:10,411 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:29:10,416 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:29:10,418 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:29:10,418 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:29:10,423 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:29:10,425 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:29:10" (1/1) ... [2020-09-21 10:29:10,429 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4297b1f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:10, skipping insertion in model container [2020-09-21 10:29:10,430 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:29:10" (1/1) ... [2020-09-21 10:29:10,440 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:29:10,466 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:29:10,767 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:29:10,774 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:29:10,799 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:29:10,825 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:29:10,826 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:10 WrapperNode [2020-09-21 10:29:10,826 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:29:10,827 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:29:10,827 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:29:10,827 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:29:10,934 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:10" (1/1) ... [2020-09-21 10:29:10,934 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:10" (1/1) ... [2020-09-21 10:29:10,943 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:10" (1/1) ... [2020-09-21 10:29:10,943 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:10" (1/1) ... [2020-09-21 10:29:10,951 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:10" (1/1) ... [2020-09-21 10:29:10,956 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:10" (1/1) ... [2020-09-21 10:29:10,958 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:10" (1/1) ... [2020-09-21 10:29:10,960 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:29:10,961 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:29:10,961 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:29:10,961 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:29:10,963 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:10" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:29:11,040 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:29:11,040 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:29:11,040 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-21 10:29:11,040 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:29:11,041 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:29:11,041 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-21 10:29:11,041 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:29:11,041 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-21 10:29:11,042 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-21 10:29:11,042 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-21 10:29:11,042 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-21 10:29:11,042 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:29:11,042 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:29:11,283 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:29:11,283 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-21 10:29:11,289 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:29:11 BoogieIcfgContainer [2020-09-21 10:29:11,289 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:29:11,291 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:29:11,291 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:29:11,295 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:29:11,296 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:29:10" (1/3) ... [2020-09-21 10:29:11,297 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2180b4bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:29:11, skipping insertion in model container [2020-09-21 10:29:11,297 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:10" (2/3) ... [2020-09-21 10:29:11,298 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2180b4bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:29:11, skipping insertion in model container [2020-09-21 10:29:11,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:29:11" (3/3) ... [2020-09-21 10:29:11,300 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-09-21 10:29:11,314 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:29:11,332 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:29:11,393 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:29:11,428 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:29:11,429 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:29:11,429 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:29:11,429 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:29:11,429 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:29:11,429 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:29:11,430 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:29:11,430 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:29:11,456 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-09-21 10:29:11,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-09-21 10:29:11,462 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:11,464 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:11,464 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:11,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:11,471 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-09-21 10:29:11,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:11,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2073940187] [2020-09-21 10:29:11,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:11,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:11,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:11,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:11,679 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:11,680 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2073940187] [2020-09-21 10:29:11,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:29:11,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-21 10:29:11,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091130058] [2020-09-21 10:29:11,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-21 10:29:11,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:11,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-21 10:29:11,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 10:29:11,706 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-09-21 10:29:11,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:11,795 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-09-21 10:29:11,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 10:29:11,797 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-09-21 10:29:11,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:11,808 INFO L225 Difference]: With dead ends: 34 [2020-09-21 10:29:11,808 INFO L226 Difference]: Without dead ends: 14 [2020-09-21 10:29:11,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 10:29:11,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-09-21 10:29:11,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-09-21 10:29:11,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-09-21 10:29:11,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-09-21 10:29:11,861 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-09-21 10:29:11,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:11,862 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-09-21 10:29:11,862 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-21 10:29:11,862 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-09-21 10:29:11,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-09-21 10:29:11,863 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:11,863 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:11,864 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:29:11,864 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:11,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:11,865 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-09-21 10:29:11,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:11,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [927304530] [2020-09-21 10:29:11,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:11,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:11,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:11,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:11,948 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:11,949 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [927304530] [2020-09-21 10:29:11,949 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:29:11,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:29:11,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127154658] [2020-09-21 10:29:11,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:29:11,952 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:11,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:29:11,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:29:11,953 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2020-09-21 10:29:12,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:12,005 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-09-21 10:29:12,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 10:29:12,006 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-09-21 10:29:12,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:12,007 INFO L225 Difference]: With dead ends: 22 [2020-09-21 10:29:12,007 INFO L226 Difference]: Without dead ends: 16 [2020-09-21 10:29:12,008 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:29:12,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-09-21 10:29:12,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-09-21 10:29:12,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-09-21 10:29:12,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-09-21 10:29:12,024 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-09-21 10:29:12,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:12,025 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-09-21 10:29:12,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:29:12,025 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-09-21 10:29:12,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-09-21 10:29:12,028 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:12,029 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:12,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:29:12,030 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:12,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:12,032 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-09-21 10:29:12,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:12,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2046007817] [2020-09-21 10:29:12,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:12,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:12,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:12,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:12,123 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:12,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2046007817] [2020-09-21 10:29:12,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:12,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-21 10:29:12,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241994798] [2020-09-21 10:29:12,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:29:12,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:12,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:29:12,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:29:12,127 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-09-21 10:29:12,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:12,177 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-09-21 10:29:12,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:29:12,178 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-09-21 10:29:12,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:12,179 INFO L225 Difference]: With dead ends: 24 [2020-09-21 10:29:12,179 INFO L226 Difference]: Without dead ends: 18 [2020-09-21 10:29:12,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:29:12,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-09-21 10:29:12,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-09-21 10:29:12,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-09-21 10:29:12,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-09-21 10:29:12,186 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-09-21 10:29:12,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:12,187 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-09-21 10:29:12,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:29:12,187 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-09-21 10:29:12,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-21 10:29:12,188 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:12,188 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:12,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:29:12,189 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:12,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:12,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2020-09-21 10:29:12,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:12,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [953084077] [2020-09-21 10:29:12,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:12,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:12,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:12,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:12,270 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:12,271 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [953084077] [2020-09-21 10:29:12,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:12,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 10:29:12,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [46423585] [2020-09-21 10:29:12,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:29:12,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:12,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:29:12,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:29:12,273 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-09-21 10:29:12,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:12,336 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-09-21 10:29:12,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:29:12,337 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-09-21 10:29:12,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:12,338 INFO L225 Difference]: With dead ends: 26 [2020-09-21 10:29:12,338 INFO L226 Difference]: Without dead ends: 20 [2020-09-21 10:29:12,340 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:29:12,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-09-21 10:29:12,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-09-21 10:29:12,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-09-21 10:29:12,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-09-21 10:29:12,346 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-09-21 10:29:12,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:12,346 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-09-21 10:29:12,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:29:12,347 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-09-21 10:29:12,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-09-21 10:29:12,347 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:12,348 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:12,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:29:12,348 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:12,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:12,349 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2020-09-21 10:29:12,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:12,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1206678880] [2020-09-21 10:29:12,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:12,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:12,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:12,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:12,436 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:12,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1206678880] [2020-09-21 10:29:12,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:12,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 10:29:12,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186884658] [2020-09-21 10:29:12,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:29:12,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:12,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:29:12,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:29:12,439 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-09-21 10:29:12,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:12,505 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-09-21 10:29:12,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 10:29:12,506 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-09-21 10:29:12,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:12,507 INFO L225 Difference]: With dead ends: 28 [2020-09-21 10:29:12,507 INFO L226 Difference]: Without dead ends: 22 [2020-09-21 10:29:12,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:29:12,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-09-21 10:29:12,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-09-21 10:29:12,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-09-21 10:29:12,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-09-21 10:29:12,514 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-09-21 10:29:12,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:12,515 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-09-21 10:29:12,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:29:12,515 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-09-21 10:29:12,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-09-21 10:29:12,516 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:12,517 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:12,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:29:12,517 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:12,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:12,518 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2020-09-21 10:29:12,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:12,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2142946766] [2020-09-21 10:29:12,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:12,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:12,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:12,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:12,681 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:12,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2142946766] [2020-09-21 10:29:12,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:12,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 10:29:12,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679100537] [2020-09-21 10:29:12,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:29:12,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:12,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:29:12,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:29:12,687 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-09-21 10:29:12,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:12,766 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-09-21 10:29:12,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 10:29:12,768 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-09-21 10:29:12,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:12,769 INFO L225 Difference]: With dead ends: 30 [2020-09-21 10:29:12,769 INFO L226 Difference]: Without dead ends: 24 [2020-09-21 10:29:12,770 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:29:12,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-09-21 10:29:12,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-09-21 10:29:12,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-09-21 10:29:12,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-09-21 10:29:12,780 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-09-21 10:29:12,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:12,780 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-09-21 10:29:12,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:29:12,781 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-09-21 10:29:12,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-21 10:29:12,782 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:12,782 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:12,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:29:12,783 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:12,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:12,783 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2020-09-21 10:29:12,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:12,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1091978606] [2020-09-21 10:29:12,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:12,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:12,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:12,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:12,951 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:12,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1091978606] [2020-09-21 10:29:12,952 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:12,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 10:29:12,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350396379] [2020-09-21 10:29:12,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 10:29:12,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:12,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 10:29:12,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:29:12,954 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-09-21 10:29:13,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:13,020 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-09-21 10:29:13,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-21 10:29:13,021 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-09-21 10:29:13,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:13,022 INFO L225 Difference]: With dead ends: 32 [2020-09-21 10:29:13,022 INFO L226 Difference]: Without dead ends: 26 [2020-09-21 10:29:13,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:29:13,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-09-21 10:29:13,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-09-21 10:29:13,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-09-21 10:29:13,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-09-21 10:29:13,029 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-09-21 10:29:13,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:13,029 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-09-21 10:29:13,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 10:29:13,029 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-09-21 10:29:13,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-21 10:29:13,030 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:13,031 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:13,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 10:29:13,031 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:13,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:13,032 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2020-09-21 10:29:13,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:13,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [18956924] [2020-09-21 10:29:13,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:13,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:13,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:13,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:13,139 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:13,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [18956924] [2020-09-21 10:29:13,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:13,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:29:13,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781326819] [2020-09-21 10:29:13,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:29:13,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:13,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:29:13,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:29:13,142 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-09-21 10:29:13,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:13,211 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-09-21 10:29:13,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:29:13,211 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-09-21 10:29:13,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:13,212 INFO L225 Difference]: With dead ends: 34 [2020-09-21 10:29:13,213 INFO L226 Difference]: Without dead ends: 28 [2020-09-21 10:29:13,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:29:13,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-09-21 10:29:13,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-09-21 10:29:13,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-09-21 10:29:13,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-09-21 10:29:13,219 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-09-21 10:29:13,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:13,220 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-09-21 10:29:13,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:29:13,220 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-09-21 10:29:13,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-21 10:29:13,221 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:13,221 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:13,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 10:29:13,222 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:13,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:13,222 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2020-09-21 10:29:13,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:13,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [855466092] [2020-09-21 10:29:13,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:13,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:13,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:13,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:13,348 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:13,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [855466092] [2020-09-21 10:29:13,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:13,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-21 10:29:13,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839378168] [2020-09-21 10:29:13,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-21 10:29:13,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:13,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-21 10:29:13,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:29:13,351 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 11 states. [2020-09-21 10:29:13,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:13,430 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-09-21 10:29:13,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-21 10:29:13,431 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2020-09-21 10:29:13,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:13,432 INFO L225 Difference]: With dead ends: 36 [2020-09-21 10:29:13,432 INFO L226 Difference]: Without dead ends: 30 [2020-09-21 10:29:13,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:29:13,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-21 10:29:13,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-09-21 10:29:13,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-09-21 10:29:13,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-09-21 10:29:13,438 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-09-21 10:29:13,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:13,439 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-09-21 10:29:13,439 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-21 10:29:13,439 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-09-21 10:29:13,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:29:13,440 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:13,440 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:13,441 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 10:29:13,441 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:13,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:13,442 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2020-09-21 10:29:13,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:13,442 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [818658384] [2020-09-21 10:29:13,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:13,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:13,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:13,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:13,591 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:13,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [818658384] [2020-09-21 10:29:13,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:13,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-21 10:29:13,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287836372] [2020-09-21 10:29:13,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-21 10:29:13,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:13,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-21 10:29:13,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:29:13,594 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 12 states. [2020-09-21 10:29:13,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:13,692 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-09-21 10:29:13,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-21 10:29:13,693 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-09-21 10:29:13,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:13,694 INFO L225 Difference]: With dead ends: 38 [2020-09-21 10:29:13,694 INFO L226 Difference]: Without dead ends: 32 [2020-09-21 10:29:13,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:29:13,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-09-21 10:29:13,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-09-21 10:29:13,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-21 10:29:13,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-09-21 10:29:13,701 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-09-21 10:29:13,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:13,701 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-09-21 10:29:13,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-21 10:29:13,702 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-09-21 10:29:13,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-09-21 10:29:13,703 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:13,703 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:13,703 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-21 10:29:13,703 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:13,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:13,704 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2020-09-21 10:29:13,704 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:13,704 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1862227144] [2020-09-21 10:29:13,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:13,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:13,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:13,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:13,855 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:13,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1862227144] [2020-09-21 10:29:13,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:13,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:29:13,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101194233] [2020-09-21 10:29:13,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:29:13,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:13,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:29:13,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:29:13,858 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 13 states. [2020-09-21 10:29:13,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:13,931 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-09-21 10:29:13,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-21 10:29:13,932 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-09-21 10:29:13,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:13,933 INFO L225 Difference]: With dead ends: 40 [2020-09-21 10:29:13,933 INFO L226 Difference]: Without dead ends: 34 [2020-09-21 10:29:13,933 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:29:13,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-21 10:29:13,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-09-21 10:29:13,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-09-21 10:29:13,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-09-21 10:29:13,938 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-09-21 10:29:13,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:13,939 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-09-21 10:29:13,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:29:13,939 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-09-21 10:29:13,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-09-21 10:29:13,940 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:13,940 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:13,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-21 10:29:13,941 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:13,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:13,941 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2020-09-21 10:29:13,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:13,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006952187] [2020-09-21 10:29:13,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:13,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:14,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,088 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:14,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006952187] [2020-09-21 10:29:14,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:14,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-21 10:29:14,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167564936] [2020-09-21 10:29:14,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-21 10:29:14,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:14,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-21 10:29:14,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:29:14,090 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-09-21 10:29:14,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:14,154 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-09-21 10:29:14,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-21 10:29:14,155 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-09-21 10:29:14,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:14,155 INFO L225 Difference]: With dead ends: 42 [2020-09-21 10:29:14,155 INFO L226 Difference]: Without dead ends: 36 [2020-09-21 10:29:14,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:29:14,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-09-21 10:29:14,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-09-21 10:29:14,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-09-21 10:29:14,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-09-21 10:29:14,161 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-09-21 10:29:14,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:14,161 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-09-21 10:29:14,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-21 10:29:14,162 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-09-21 10:29:14,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-21 10:29:14,163 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:14,163 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:14,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-21 10:29:14,163 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:14,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:14,164 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2020-09-21 10:29:14,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:14,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [729018690] [2020-09-21 10:29:14,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:14,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:14,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,327 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:14,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [729018690] [2020-09-21 10:29:14,327 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:14,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-21 10:29:14,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72230563] [2020-09-21 10:29:14,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-21 10:29:14,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:14,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-21 10:29:14,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:29:14,329 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 15 states. [2020-09-21 10:29:14,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:14,415 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-09-21 10:29:14,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-21 10:29:14,416 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2020-09-21 10:29:14,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:14,416 INFO L225 Difference]: With dead ends: 44 [2020-09-21 10:29:14,417 INFO L226 Difference]: Without dead ends: 38 [2020-09-21 10:29:14,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:29:14,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-09-21 10:29:14,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-09-21 10:29:14,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-21 10:29:14,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-09-21 10:29:14,422 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-09-21 10:29:14,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:14,423 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-09-21 10:29:14,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-21 10:29:14,423 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-09-21 10:29:14,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-21 10:29:14,424 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:14,424 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:14,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-21 10:29:14,424 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:14,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:14,425 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2020-09-21 10:29:14,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:14,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1970011120] [2020-09-21 10:29:14,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:14,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:14,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,611 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:14,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1970011120] [2020-09-21 10:29:14,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:14,611 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-09-21 10:29:14,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691775026] [2020-09-21 10:29:14,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-21 10:29:14,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:14,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-21 10:29:14,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:29:14,613 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 16 states. [2020-09-21 10:29:14,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:14,697 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-09-21 10:29:14,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-21 10:29:14,697 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-09-21 10:29:14,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:14,698 INFO L225 Difference]: With dead ends: 46 [2020-09-21 10:29:14,698 INFO L226 Difference]: Without dead ends: 40 [2020-09-21 10:29:14,699 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:29:14,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-09-21 10:29:14,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-09-21 10:29:14,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-09-21 10:29:14,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-09-21 10:29:14,706 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-09-21 10:29:14,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:14,709 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-09-21 10:29:14,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-21 10:29:14,709 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-09-21 10:29:14,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-09-21 10:29:14,710 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:14,710 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:14,710 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-21 10:29:14,710 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:14,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:14,711 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2020-09-21 10:29:14,711 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:14,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [189277661] [2020-09-21 10:29:14,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:14,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:14,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,917 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:14,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [189277661] [2020-09-21 10:29:14,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:14,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-21 10:29:14,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908837595] [2020-09-21 10:29:14,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-21 10:29:14,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:14,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-21 10:29:14,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:29:14,920 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 17 states. [2020-09-21 10:29:15,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:15,057 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-09-21 10:29:15,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-09-21 10:29:15,057 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-09-21 10:29:15,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:15,058 INFO L225 Difference]: With dead ends: 48 [2020-09-21 10:29:15,059 INFO L226 Difference]: Without dead ends: 42 [2020-09-21 10:29:15,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:29:15,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-09-21 10:29:15,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-09-21 10:29:15,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-21 10:29:15,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-09-21 10:29:15,065 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-09-21 10:29:15,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:15,065 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-09-21 10:29:15,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-21 10:29:15,066 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-09-21 10:29:15,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-09-21 10:29:15,066 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:15,066 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:15,067 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-21 10:29:15,067 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:15,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:15,067 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2020-09-21 10:29:15,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:15,068 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [728360812] [2020-09-21 10:29:15,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:15,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:15,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:15,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:15,293 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:15,294 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [728360812] [2020-09-21 10:29:15,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:15,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-09-21 10:29:15,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548025037] [2020-09-21 10:29:15,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-21 10:29:15,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:15,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-21 10:29:15,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:29:15,296 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 18 states. [2020-09-21 10:29:15,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:15,422 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-09-21 10:29:15,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-21 10:29:15,422 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-09-21 10:29:15,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:15,423 INFO L225 Difference]: With dead ends: 50 [2020-09-21 10:29:15,423 INFO L226 Difference]: Without dead ends: 44 [2020-09-21 10:29:15,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:29:15,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-21 10:29:15,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-09-21 10:29:15,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-09-21 10:29:15,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-09-21 10:29:15,429 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-09-21 10:29:15,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:15,430 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-09-21 10:29:15,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-21 10:29:15,430 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-09-21 10:29:15,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-21 10:29:15,431 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:15,431 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:15,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-21 10:29:15,431 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:15,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:15,432 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2020-09-21 10:29:15,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:15,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1758738371] [2020-09-21 10:29:15,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:15,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:15,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:15,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:15,682 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:15,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1758738371] [2020-09-21 10:29:15,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:15,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-09-21 10:29:15,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14024612] [2020-09-21 10:29:15,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-21 10:29:15,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:15,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-21 10:29:15,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:29:15,684 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 19 states. [2020-09-21 10:29:15,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:15,797 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-09-21 10:29:15,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-21 10:29:15,797 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2020-09-21 10:29:15,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:15,798 INFO L225 Difference]: With dead ends: 52 [2020-09-21 10:29:15,798 INFO L226 Difference]: Without dead ends: 46 [2020-09-21 10:29:15,799 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:29:15,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-09-21 10:29:15,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-09-21 10:29:15,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-09-21 10:29:15,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-09-21 10:29:15,804 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-09-21 10:29:15,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:15,805 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-09-21 10:29:15,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-21 10:29:15,805 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-09-21 10:29:15,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-09-21 10:29:15,806 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:15,806 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:15,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-21 10:29:15,807 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:15,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:15,807 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2020-09-21 10:29:15,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:15,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [44663814] [2020-09-21 10:29:15,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:15,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:16,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:16,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:16,078 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:16,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [44663814] [2020-09-21 10:29:16,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:16,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-09-21 10:29:16,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865002616] [2020-09-21 10:29:16,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-09-21 10:29:16,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:16,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-09-21 10:29:16,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:29:16,081 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 20 states. [2020-09-21 10:29:16,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:16,199 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-09-21 10:29:16,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-09-21 10:29:16,200 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2020-09-21 10:29:16,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:16,200 INFO L225 Difference]: With dead ends: 54 [2020-09-21 10:29:16,201 INFO L226 Difference]: Without dead ends: 48 [2020-09-21 10:29:16,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:29:16,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-09-21 10:29:16,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-09-21 10:29:16,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-09-21 10:29:16,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-09-21 10:29:16,207 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-09-21 10:29:16,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:16,207 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-09-21 10:29:16,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-09-21 10:29:16,208 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-09-21 10:29:16,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-09-21 10:29:16,209 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:16,209 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:16,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-09-21 10:29:16,209 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:16,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:16,210 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2020-09-21 10:29:16,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:16,210 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1713164796] [2020-09-21 10:29:16,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:16,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:16,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:16,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:16,494 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:16,495 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1713164796] [2020-09-21 10:29:16,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:16,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-21 10:29:16,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3591810] [2020-09-21 10:29:16,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-21 10:29:16,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:16,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-21 10:29:16,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:29:16,498 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 21 states. [2020-09-21 10:29:16,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:16,604 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-09-21 10:29:16,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-21 10:29:16,605 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2020-09-21 10:29:16,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:16,606 INFO L225 Difference]: With dead ends: 56 [2020-09-21 10:29:16,606 INFO L226 Difference]: Without dead ends: 50 [2020-09-21 10:29:16,607 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:29:16,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-09-21 10:29:16,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-09-21 10:29:16,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-09-21 10:29:16,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-09-21 10:29:16,624 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-09-21 10:29:16,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:16,625 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-09-21 10:29:16,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-21 10:29:16,625 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-09-21 10:29:16,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-21 10:29:16,626 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:16,626 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:16,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-09-21 10:29:16,627 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:16,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:16,627 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2020-09-21 10:29:16,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:16,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1617269110] [2020-09-21 10:29:16,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:16,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:16,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:16,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:16,948 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:16,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1617269110] [2020-09-21 10:29:16,949 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:16,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-09-21 10:29:16,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732448332] [2020-09-21 10:29:16,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-09-21 10:29:16,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:16,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-09-21 10:29:16,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:29:16,950 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 22 states. [2020-09-21 10:29:17,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:17,030 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-09-21 10:29:17,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-21 10:29:17,031 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2020-09-21 10:29:17,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:17,032 INFO L225 Difference]: With dead ends: 58 [2020-09-21 10:29:17,032 INFO L226 Difference]: Without dead ends: 52 [2020-09-21 10:29:17,033 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:29:17,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-09-21 10:29:17,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-09-21 10:29:17,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-09-21 10:29:17,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-09-21 10:29:17,037 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-09-21 10:29:17,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:17,038 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-09-21 10:29:17,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-09-21 10:29:17,038 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-09-21 10:29:17,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-09-21 10:29:17,039 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:17,039 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:17,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-09-21 10:29:17,039 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:17,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:17,040 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2020-09-21 10:29:17,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:17,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [118770260] [2020-09-21 10:29:17,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:17,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:17,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:17,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:17,393 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:17,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [118770260] [2020-09-21 10:29:17,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:17,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-09-21 10:29:17,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599323010] [2020-09-21 10:29:17,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-09-21 10:29:17,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:17,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-09-21 10:29:17,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:29:17,396 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 23 states. [2020-09-21 10:29:17,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:17,564 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-09-21 10:29:17,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-09-21 10:29:17,565 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2020-09-21 10:29:17,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:17,566 INFO L225 Difference]: With dead ends: 60 [2020-09-21 10:29:17,566 INFO L226 Difference]: Without dead ends: 54 [2020-09-21 10:29:17,567 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:29:17,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-09-21 10:29:17,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-09-21 10:29:17,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-09-21 10:29:17,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-09-21 10:29:17,578 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-09-21 10:29:17,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:17,579 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-09-21 10:29:17,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-09-21 10:29:17,579 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-09-21 10:29:17,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-09-21 10:29:17,583 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:17,584 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:17,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-09-21 10:29:17,584 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:17,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:17,585 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2020-09-21 10:29:17,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:17,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [373803720] [2020-09-21 10:29:17,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:17,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:18,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:18,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:18,022 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:18,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [373803720] [2020-09-21 10:29:18,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:18,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-09-21 10:29:18,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685797468] [2020-09-21 10:29:18,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-09-21 10:29:18,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:18,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-09-21 10:29:18,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:29:18,027 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 24 states. [2020-09-21 10:29:18,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:18,134 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-09-21 10:29:18,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-09-21 10:29:18,136 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 52 [2020-09-21 10:29:18,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:18,137 INFO L225 Difference]: With dead ends: 62 [2020-09-21 10:29:18,137 INFO L226 Difference]: Without dead ends: 56 [2020-09-21 10:29:18,137 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:29:18,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-09-21 10:29:18,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-09-21 10:29:18,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-09-21 10:29:18,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-09-21 10:29:18,142 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-09-21 10:29:18,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:18,142 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-09-21 10:29:18,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-09-21 10:29:18,143 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-09-21 10:29:18,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-09-21 10:29:18,146 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:18,146 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:18,147 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-09-21 10:29:18,147 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:18,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:18,147 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2020-09-21 10:29:18,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:18,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1812957888] [2020-09-21 10:29:18,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:18,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:18,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:18,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:18,513 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:18,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1812957888] [2020-09-21 10:29:18,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:18,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-09-21 10:29:18,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83705341] [2020-09-21 10:29:18,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-09-21 10:29:18,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:18,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-09-21 10:29:18,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:29:18,516 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 25 states. [2020-09-21 10:29:18,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:18,641 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-09-21 10:29:18,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-09-21 10:29:18,642 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2020-09-21 10:29:18,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:18,642 INFO L225 Difference]: With dead ends: 64 [2020-09-21 10:29:18,643 INFO L226 Difference]: Without dead ends: 58 [2020-09-21 10:29:18,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:29:18,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-09-21 10:29:18,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-09-21 10:29:18,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-09-21 10:29:18,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-09-21 10:29:18,647 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-09-21 10:29:18,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:18,648 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-09-21 10:29:18,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-09-21 10:29:18,648 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-09-21 10:29:18,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-09-21 10:29:18,648 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:18,649 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:18,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-09-21 10:29:18,649 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:18,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:18,649 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2020-09-21 10:29:18,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:18,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [105401915] [2020-09-21 10:29:18,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:18,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:19,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,074 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:19,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [105401915] [2020-09-21 10:29:19,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:19,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-09-21 10:29:19,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474991724] [2020-09-21 10:29:19,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-09-21 10:29:19,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:19,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-09-21 10:29:19,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-09-21 10:29:19,077 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 26 states. [2020-09-21 10:29:19,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:19,231 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-09-21 10:29:19,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-09-21 10:29:19,232 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 56 [2020-09-21 10:29:19,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:19,233 INFO L225 Difference]: With dead ends: 66 [2020-09-21 10:29:19,233 INFO L226 Difference]: Without dead ends: 60 [2020-09-21 10:29:19,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-09-21 10:29:19,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-09-21 10:29:19,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-09-21 10:29:19,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-09-21 10:29:19,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-09-21 10:29:19,238 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-09-21 10:29:19,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:19,238 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-09-21 10:29:19,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-09-21 10:29:19,238 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-09-21 10:29:19,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-09-21 10:29:19,239 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:19,240 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:19,241 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-09-21 10:29:19,243 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:19,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:19,244 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2020-09-21 10:29:19,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:19,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [925077200] [2020-09-21 10:29:19,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:19,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:19,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,719 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:19,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [925077200] [2020-09-21 10:29:19,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:19,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-09-21 10:29:19,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473029956] [2020-09-21 10:29:19,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-09-21 10:29:19,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:19,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-09-21 10:29:19,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:29:19,721 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 27 states. [2020-09-21 10:29:19,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:19,891 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-09-21 10:29:19,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-09-21 10:29:19,892 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 58 [2020-09-21 10:29:19,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:19,893 INFO L225 Difference]: With dead ends: 68 [2020-09-21 10:29:19,893 INFO L226 Difference]: Without dead ends: 62 [2020-09-21 10:29:19,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:29:19,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-09-21 10:29:19,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-09-21 10:29:19,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-09-21 10:29:19,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-09-21 10:29:19,898 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-09-21 10:29:19,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:19,899 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-09-21 10:29:19,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-09-21 10:29:19,899 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-09-21 10:29:19,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-09-21 10:29:19,899 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:19,900 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:19,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-09-21 10:29:19,900 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:19,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:19,900 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2020-09-21 10:29:19,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:19,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1986607807] [2020-09-21 10:29:19,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:19,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:20,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:20,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:20,385 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:20,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1986607807] [2020-09-21 10:29:20,386 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:20,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-09-21 10:29:20,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228264126] [2020-09-21 10:29:20,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-09-21 10:29:20,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:20,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-09-21 10:29:20,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-09-21 10:29:20,391 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 28 states. [2020-09-21 10:29:20,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:20,597 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-09-21 10:29:20,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-09-21 10:29:20,597 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 60 [2020-09-21 10:29:20,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:20,598 INFO L225 Difference]: With dead ends: 70 [2020-09-21 10:29:20,598 INFO L226 Difference]: Without dead ends: 64 [2020-09-21 10:29:20,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-09-21 10:29:20,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-09-21 10:29:20,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-09-21 10:29:20,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-09-21 10:29:20,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-09-21 10:29:20,603 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-09-21 10:29:20,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:20,604 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-09-21 10:29:20,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-09-21 10:29:20,604 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-09-21 10:29:20,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-09-21 10:29:20,605 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:20,606 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:20,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-09-21 10:29:20,606 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:20,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:20,607 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2020-09-21 10:29:20,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:20,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [946913720] [2020-09-21 10:29:20,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:20,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:21,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:21,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:21,256 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:21,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [946913720] [2020-09-21 10:29:21,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:21,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-09-21 10:29:21,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508248402] [2020-09-21 10:29:21,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-21 10:29:21,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:21,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-21 10:29:21,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:29:21,259 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 29 states. [2020-09-21 10:29:21,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:21,440 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-09-21 10:29:21,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-09-21 10:29:21,440 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2020-09-21 10:29:21,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:21,441 INFO L225 Difference]: With dead ends: 72 [2020-09-21 10:29:21,441 INFO L226 Difference]: Without dead ends: 66 [2020-09-21 10:29:21,442 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:29:21,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-09-21 10:29:21,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-09-21 10:29:21,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-09-21 10:29:21,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-09-21 10:29:21,445 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-09-21 10:29:21,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:21,446 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-09-21 10:29:21,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-21 10:29:21,446 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-09-21 10:29:21,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-09-21 10:29:21,447 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:21,447 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:21,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-09-21 10:29:21,447 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:21,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:21,448 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2020-09-21 10:29:21,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:21,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529813323] [2020-09-21 10:29:21,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:21,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:22,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:22,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:22,103 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:22,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529813323] [2020-09-21 10:29:22,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:22,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-09-21 10:29:22,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914614305] [2020-09-21 10:29:22,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-09-21 10:29:22,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:22,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-09-21 10:29:22,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-09-21 10:29:22,106 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 30 states. [2020-09-21 10:29:22,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:22,330 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-09-21 10:29:22,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-09-21 10:29:22,330 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 64 [2020-09-21 10:29:22,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:22,331 INFO L225 Difference]: With dead ends: 74 [2020-09-21 10:29:22,331 INFO L226 Difference]: Without dead ends: 68 [2020-09-21 10:29:22,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-09-21 10:29:22,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-09-21 10:29:22,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-09-21 10:29:22,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-09-21 10:29:22,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-09-21 10:29:22,340 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-09-21 10:29:22,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:22,340 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-09-21 10:29:22,340 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-09-21 10:29:22,340 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-09-21 10:29:22,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-09-21 10:29:22,341 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:22,341 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:22,341 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-09-21 10:29:22,341 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:22,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:22,342 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2020-09-21 10:29:22,342 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:22,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [743669248] [2020-09-21 10:29:22,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:22,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:22,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:22,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:22,948 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:22,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [743669248] [2020-09-21 10:29:22,949 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:22,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-09-21 10:29:22,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556414804] [2020-09-21 10:29:22,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-09-21 10:29:22,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:22,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-09-21 10:29:22,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:29:22,951 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 31 states. [2020-09-21 10:29:23,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:23,173 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-09-21 10:29:23,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-09-21 10:29:23,174 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 66 [2020-09-21 10:29:23,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:23,175 INFO L225 Difference]: With dead ends: 76 [2020-09-21 10:29:23,176 INFO L226 Difference]: Without dead ends: 70 [2020-09-21 10:29:23,177 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:29:23,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-09-21 10:29:23,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-09-21 10:29:23,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-09-21 10:29:23,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-09-21 10:29:23,181 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-09-21 10:29:23,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:23,181 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-09-21 10:29:23,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-09-21 10:29:23,182 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-09-21 10:29:23,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-09-21 10:29:23,182 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:23,182 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:23,183 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-09-21 10:29:23,183 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:23,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:23,183 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2020-09-21 10:29:23,183 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:23,184 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [640539375] [2020-09-21 10:29:23,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:23,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:23,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:23,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:23,794 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:23,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [640539375] [2020-09-21 10:29:23,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:23,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-09-21 10:29:23,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343154018] [2020-09-21 10:29:23,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-09-21 10:29:23,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:23,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-09-21 10:29:23,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-09-21 10:29:23,797 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 32 states. [2020-09-21 10:29:24,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:24,034 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-09-21 10:29:24,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-09-21 10:29:24,035 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2020-09-21 10:29:24,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:24,036 INFO L225 Difference]: With dead ends: 78 [2020-09-21 10:29:24,036 INFO L226 Difference]: Without dead ends: 72 [2020-09-21 10:29:24,038 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-09-21 10:29:24,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-09-21 10:29:24,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-09-21 10:29:24,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-09-21 10:29:24,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-09-21 10:29:24,041 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-09-21 10:29:24,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:24,041 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-09-21 10:29:24,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-09-21 10:29:24,041 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-09-21 10:29:24,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-09-21 10:29:24,042 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:24,042 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:24,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-09-21 10:29:24,042 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:24,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:24,043 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2020-09-21 10:29:24,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:24,043 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1431159792] [2020-09-21 10:29:24,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:24,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:24,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:24,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:24,775 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:24,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1431159792] [2020-09-21 10:29:24,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:24,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-09-21 10:29:24,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575607085] [2020-09-21 10:29:24,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-09-21 10:29:24,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:24,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-09-21 10:29:24,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:29:24,777 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 33 states. [2020-09-21 10:29:25,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:25,041 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-09-21 10:29:25,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-09-21 10:29:25,042 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 70 [2020-09-21 10:29:25,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:25,043 INFO L225 Difference]: With dead ends: 80 [2020-09-21 10:29:25,043 INFO L226 Difference]: Without dead ends: 74 [2020-09-21 10:29:25,044 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:29:25,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-09-21 10:29:25,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-09-21 10:29:25,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-09-21 10:29:25,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-09-21 10:29:25,050 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-09-21 10:29:25,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:25,051 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-09-21 10:29:25,051 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-09-21 10:29:25,051 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-09-21 10:29:25,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-09-21 10:29:25,052 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:25,052 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:25,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-09-21 10:29:25,055 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:25,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:25,056 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2020-09-21 10:29:25,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:25,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [220163289] [2020-09-21 10:29:25,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:25,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:25,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:25,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:25,946 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:25,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [220163289] [2020-09-21 10:29:25,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:25,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-09-21 10:29:25,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015437320] [2020-09-21 10:29:25,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-09-21 10:29:25,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:25,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-09-21 10:29:25,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 10:29:25,951 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 34 states. [2020-09-21 10:29:26,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:26,210 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-09-21 10:29:26,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-09-21 10:29:26,210 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2020-09-21 10:29:26,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:26,212 INFO L225 Difference]: With dead ends: 82 [2020-09-21 10:29:26,212 INFO L226 Difference]: Without dead ends: 76 [2020-09-21 10:29:26,216 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 10:29:26,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-09-21 10:29:26,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-09-21 10:29:26,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-09-21 10:29:26,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-09-21 10:29:26,223 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-09-21 10:29:26,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:26,224 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-09-21 10:29:26,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-09-21 10:29:26,224 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-09-21 10:29:26,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-09-21 10:29:26,225 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:26,225 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:26,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-09-21 10:29:26,226 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:26,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:26,227 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2020-09-21 10:29:26,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:26,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1878086984] [2020-09-21 10:29:26,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:26,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:26,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:26,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:26,983 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:26,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1878086984] [2020-09-21 10:29:26,984 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:26,984 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-09-21 10:29:26,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729909370] [2020-09-21 10:29:26,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-09-21 10:29:26,985 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:26,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-09-21 10:29:26,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:29:26,987 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 35 states. [2020-09-21 10:29:27,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:27,201 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-09-21 10:29:27,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-09-21 10:29:27,201 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-09-21 10:29:27,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:27,202 INFO L225 Difference]: With dead ends: 84 [2020-09-21 10:29:27,203 INFO L226 Difference]: Without dead ends: 78 [2020-09-21 10:29:27,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:29:27,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-09-21 10:29:27,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-09-21 10:29:27,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-09-21 10:29:27,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-09-21 10:29:27,211 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-09-21 10:29:27,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:27,211 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-09-21 10:29:27,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-09-21 10:29:27,212 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-09-21 10:29:27,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-09-21 10:29:27,212 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:27,212 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:27,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-09-21 10:29:27,213 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:27,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:27,213 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2020-09-21 10:29:27,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:27,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2046252652] [2020-09-21 10:29:27,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:27,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:27,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:27,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:27,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:27,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2046252652] [2020-09-21 10:29:27,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:27,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-09-21 10:29:27,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759471639] [2020-09-21 10:29:27,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-09-21 10:29:27,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:27,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-09-21 10:29:27,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:29:27,995 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 36 states. [2020-09-21 10:29:28,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:28,192 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2020-09-21 10:29:28,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-09-21 10:29:28,193 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 76 [2020-09-21 10:29:28,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:28,194 INFO L225 Difference]: With dead ends: 86 [2020-09-21 10:29:28,194 INFO L226 Difference]: Without dead ends: 80 [2020-09-21 10:29:28,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:29:28,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-09-21 10:29:28,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-09-21 10:29:28,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-09-21 10:29:28,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-09-21 10:29:28,201 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-09-21 10:29:28,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:28,201 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-09-21 10:29:28,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-09-21 10:29:28,201 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-09-21 10:29:28,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-09-21 10:29:28,202 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:28,202 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:28,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-09-21 10:29:28,203 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:28,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:28,203 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2020-09-21 10:29:28,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:28,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [341577853] [2020-09-21 10:29:28,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:28,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:29,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:29,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:29,061 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:29,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [341577853] [2020-09-21 10:29:29,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:29,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-09-21 10:29:29,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758148633] [2020-09-21 10:29:29,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-09-21 10:29:29,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:29,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-09-21 10:29:29,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-09-21 10:29:29,064 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 37 states. [2020-09-21 10:29:29,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:29,294 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2020-09-21 10:29:29,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-09-21 10:29:29,295 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 78 [2020-09-21 10:29:29,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:29,296 INFO L225 Difference]: With dead ends: 88 [2020-09-21 10:29:29,296 INFO L226 Difference]: Without dead ends: 82 [2020-09-21 10:29:29,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-09-21 10:29:29,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-09-21 10:29:29,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-09-21 10:29:29,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-09-21 10:29:29,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2020-09-21 10:29:29,300 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2020-09-21 10:29:29,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:29,301 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2020-09-21 10:29:29,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-09-21 10:29:29,301 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2020-09-21 10:29:29,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-09-21 10:29:29,301 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:29,301 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:29,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-09-21 10:29:29,302 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:29,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:29,302 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2020-09-21 10:29:29,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:29,303 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [987140925] [2020-09-21 10:29:29,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:29,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:30,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:30,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:30,089 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:30,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [987140925] [2020-09-21 10:29:30,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:30,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-09-21 10:29:30,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128014330] [2020-09-21 10:29:30,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-09-21 10:29:30,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:30,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-09-21 10:29:30,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-09-21 10:29:30,092 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 38 states. [2020-09-21 10:29:30,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:30,320 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2020-09-21 10:29:30,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-09-21 10:29:30,320 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 80 [2020-09-21 10:29:30,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:30,322 INFO L225 Difference]: With dead ends: 90 [2020-09-21 10:29:30,322 INFO L226 Difference]: Without dead ends: 84 [2020-09-21 10:29:30,322 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-09-21 10:29:30,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-09-21 10:29:30,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-09-21 10:29:30,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-09-21 10:29:30,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2020-09-21 10:29:30,326 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2020-09-21 10:29:30,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:30,327 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2020-09-21 10:29:30,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-09-21 10:29:30,327 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2020-09-21 10:29:30,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-09-21 10:29:30,327 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:30,328 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:30,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-09-21 10:29:30,328 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:30,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:30,328 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2020-09-21 10:29:30,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:30,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449224348] [2020-09-21 10:29:30,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:30,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:31,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:31,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:31,310 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:31,310 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449224348] [2020-09-21 10:29:31,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:31,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-09-21 10:29:31,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747676405] [2020-09-21 10:29:31,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-09-21 10:29:31,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:31,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-09-21 10:29:31,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-09-21 10:29:31,312 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 39 states. [2020-09-21 10:29:31,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:31,509 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2020-09-21 10:29:31,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-09-21 10:29:31,510 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2020-09-21 10:29:31,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:31,511 INFO L225 Difference]: With dead ends: 92 [2020-09-21 10:29:31,511 INFO L226 Difference]: Without dead ends: 86 [2020-09-21 10:29:31,512 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-09-21 10:29:31,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-09-21 10:29:31,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-09-21 10:29:31,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-09-21 10:29:31,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2020-09-21 10:29:31,517 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2020-09-21 10:29:31,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:31,517 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2020-09-21 10:29:31,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-09-21 10:29:31,517 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2020-09-21 10:29:31,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-09-21 10:29:31,518 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:31,518 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:31,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-09-21 10:29:31,519 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:31,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:31,519 INFO L82 PathProgramCache]: Analyzing trace with hash 1557780453, now seen corresponding path program 36 times [2020-09-21 10:29:31,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:31,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1421541078] [2020-09-21 10:29:31,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:31,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:32,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:32,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:32,574 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:32,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1421541078] [2020-09-21 10:29:32,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:32,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-09-21 10:29:32,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135458945] [2020-09-21 10:29:32,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-09-21 10:29:32,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:32,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-09-21 10:29:32,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-09-21 10:29:32,577 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 40 states. [2020-09-21 10:29:32,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:32,835 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2020-09-21 10:29:32,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-09-21 10:29:32,836 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 84 [2020-09-21 10:29:32,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:32,837 INFO L225 Difference]: With dead ends: 94 [2020-09-21 10:29:32,837 INFO L226 Difference]: Without dead ends: 88 [2020-09-21 10:29:32,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-09-21 10:29:32,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-09-21 10:29:32,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-09-21 10:29:32,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-09-21 10:29:32,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2020-09-21 10:29:32,841 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2020-09-21 10:29:32,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:32,842 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2020-09-21 10:29:32,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-09-21 10:29:32,842 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2020-09-21 10:29:32,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-09-21 10:29:32,843 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:32,843 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:32,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-09-21 10:29:32,844 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:32,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:32,844 INFO L82 PathProgramCache]: Analyzing trace with hash 1537674631, now seen corresponding path program 37 times [2020-09-21 10:29:32,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:32,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2130121883] [2020-09-21 10:29:32,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:32,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:33,913 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:33,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:33,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:33,923 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2130121883] [2020-09-21 10:29:33,923 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:33,923 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-09-21 10:29:33,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438623641] [2020-09-21 10:29:33,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-09-21 10:29:33,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:33,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-09-21 10:29:33,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-09-21 10:29:33,925 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 41 states. [2020-09-21 10:29:34,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:34,238 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2020-09-21 10:29:34,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-09-21 10:29:34,238 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-09-21 10:29:34,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:34,239 INFO L225 Difference]: With dead ends: 96 [2020-09-21 10:29:34,240 INFO L226 Difference]: Without dead ends: 90 [2020-09-21 10:29:34,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-09-21 10:29:34,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-09-21 10:29:34,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-09-21 10:29:34,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-09-21 10:29:34,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2020-09-21 10:29:34,247 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2020-09-21 10:29:34,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:34,247 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2020-09-21 10:29:34,247 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-09-21 10:29:34,247 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2020-09-21 10:29:34,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-09-21 10:29:34,248 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:34,248 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:34,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-09-21 10:29:34,249 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:34,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:34,249 INFO L82 PathProgramCache]: Analyzing trace with hash -604151127, now seen corresponding path program 38 times [2020-09-21 10:29:34,249 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:34,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [387360659] [2020-09-21 10:29:34,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:34,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:35,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:35,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:35,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:35,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [387360659] [2020-09-21 10:29:35,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:35,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-09-21 10:29:35,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363072968] [2020-09-21 10:29:35,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-09-21 10:29:35,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:35,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-09-21 10:29:35,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-09-21 10:29:35,347 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 42 states. [2020-09-21 10:29:35,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:35,635 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2020-09-21 10:29:35,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-09-21 10:29:35,635 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 88 [2020-09-21 10:29:35,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:35,637 INFO L225 Difference]: With dead ends: 98 [2020-09-21 10:29:35,637 INFO L226 Difference]: Without dead ends: 92 [2020-09-21 10:29:35,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-09-21 10:29:35,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-09-21 10:29:35,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-09-21 10:29:35,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-09-21 10:29:35,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2020-09-21 10:29:35,643 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2020-09-21 10:29:35,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:35,643 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2020-09-21 10:29:35,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-09-21 10:29:35,644 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2020-09-21 10:29:35,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-09-21 10:29:35,644 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:35,645 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:35,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-09-21 10:29:35,645 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:35,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:35,645 INFO L82 PathProgramCache]: Analyzing trace with hash -1609369781, now seen corresponding path program 39 times [2020-09-21 10:29:35,646 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:35,646 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805401927] [2020-09-21 10:29:35,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:35,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:36,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:36,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:36,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:36,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805401927] [2020-09-21 10:29:36,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:36,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-09-21 10:29:36,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211195163] [2020-09-21 10:29:36,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-09-21 10:29:36,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:36,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-09-21 10:29:36,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-09-21 10:29:36,848 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 43 states. [2020-09-21 10:29:37,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:37,142 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2020-09-21 10:29:37,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-09-21 10:29:37,143 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 90 [2020-09-21 10:29:37,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:37,144 INFO L225 Difference]: With dead ends: 100 [2020-09-21 10:29:37,144 INFO L226 Difference]: Without dead ends: 94 [2020-09-21 10:29:37,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-09-21 10:29:37,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-09-21 10:29:37,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-09-21 10:29:37,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-09-21 10:29:37,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2020-09-21 10:29:37,157 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2020-09-21 10:29:37,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:37,158 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2020-09-21 10:29:37,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-09-21 10:29:37,158 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2020-09-21 10:29:37,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-09-21 10:29:37,159 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:37,160 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:37,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-09-21 10:29:37,160 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:37,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:37,161 INFO L82 PathProgramCache]: Analyzing trace with hash -1256854675, now seen corresponding path program 40 times [2020-09-21 10:29:37,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:37,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950352986] [2020-09-21 10:29:37,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:37,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:38,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:38,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:38,580 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:38,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950352986] [2020-09-21 10:29:38,581 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:38,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-09-21 10:29:38,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353862415] [2020-09-21 10:29:38,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-09-21 10:29:38,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:38,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-09-21 10:29:38,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-09-21 10:29:38,584 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 44 states. [2020-09-21 10:29:38,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:38,828 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2020-09-21 10:29:38,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-09-21 10:29:38,829 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 92 [2020-09-21 10:29:38,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:38,830 INFO L225 Difference]: With dead ends: 102 [2020-09-21 10:29:38,831 INFO L226 Difference]: Without dead ends: 96 [2020-09-21 10:29:38,832 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-09-21 10:29:38,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-09-21 10:29:38,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-09-21 10:29:38,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-09-21 10:29:38,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2020-09-21 10:29:38,837 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2020-09-21 10:29:38,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:38,838 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2020-09-21 10:29:38,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-09-21 10:29:38,838 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2020-09-21 10:29:38,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-09-21 10:29:38,839 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:38,840 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:38,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-09-21 10:29:38,840 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:38,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:38,841 INFO L82 PathProgramCache]: Analyzing trace with hash -1792254193, now seen corresponding path program 41 times [2020-09-21 10:29:38,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:38,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [404858566] [2020-09-21 10:29:38,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:38,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:40,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:40,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:40,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:40,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [404858566] [2020-09-21 10:29:40,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:40,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-09-21 10:29:40,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501645979] [2020-09-21 10:29:40,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-09-21 10:29:40,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:40,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-09-21 10:29:40,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-09-21 10:29:40,173 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 45 states. [2020-09-21 10:29:40,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:40,473 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2020-09-21 10:29:40,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-09-21 10:29:40,473 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 94 [2020-09-21 10:29:40,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:40,475 INFO L225 Difference]: With dead ends: 104 [2020-09-21 10:29:40,475 INFO L226 Difference]: Without dead ends: 98 [2020-09-21 10:29:40,477 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-09-21 10:29:40,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-09-21 10:29:40,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-09-21 10:29:40,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-09-21 10:29:40,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2020-09-21 10:29:40,481 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2020-09-21 10:29:40,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:40,481 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2020-09-21 10:29:40,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-09-21 10:29:40,481 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2020-09-21 10:29:40,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-09-21 10:29:40,482 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:40,482 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:40,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-09-21 10:29:40,482 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:40,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:40,483 INFO L82 PathProgramCache]: Analyzing trace with hash -915115471, now seen corresponding path program 42 times [2020-09-21 10:29:40,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:40,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1277809483] [2020-09-21 10:29:40,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:40,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:41,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:41,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:41,838 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:41,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1277809483] [2020-09-21 10:29:41,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:41,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-09-21 10:29:41,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153253433] [2020-09-21 10:29:41,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-09-21 10:29:41,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:41,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-09-21 10:29:41,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-09-21 10:29:41,840 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 46 states. [2020-09-21 10:29:42,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:42,039 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2020-09-21 10:29:42,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-09-21 10:29:42,039 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 96 [2020-09-21 10:29:42,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:42,040 INFO L225 Difference]: With dead ends: 106 [2020-09-21 10:29:42,041 INFO L226 Difference]: Without dead ends: 100 [2020-09-21 10:29:42,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-09-21 10:29:42,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-09-21 10:29:42,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-09-21 10:29:42,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-09-21 10:29:42,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2020-09-21 10:29:42,046 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2020-09-21 10:29:42,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:42,047 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2020-09-21 10:29:42,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-09-21 10:29:42,047 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2020-09-21 10:29:42,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-09-21 10:29:42,048 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:42,048 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:42,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-09-21 10:29:42,049 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:42,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:42,049 INFO L82 PathProgramCache]: Analyzing trace with hash 201606355, now seen corresponding path program 43 times [2020-09-21 10:29:42,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:42,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [754086818] [2020-09-21 10:29:42,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:42,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:43,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:43,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:43,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:43,421 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [754086818] [2020-09-21 10:29:43,421 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:43,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-09-21 10:29:43,422 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686906646] [2020-09-21 10:29:43,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-09-21 10:29:43,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:43,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-09-21 10:29:43,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-09-21 10:29:43,423 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 47 states. [2020-09-21 10:29:43,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:43,734 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2020-09-21 10:29:43,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-09-21 10:29:43,735 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 98 [2020-09-21 10:29:43,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:43,736 INFO L225 Difference]: With dead ends: 108 [2020-09-21 10:29:43,736 INFO L226 Difference]: Without dead ends: 102 [2020-09-21 10:29:43,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-09-21 10:29:43,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-09-21 10:29:43,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-09-21 10:29:43,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-09-21 10:29:43,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2020-09-21 10:29:43,742 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2020-09-21 10:29:43,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:43,742 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2020-09-21 10:29:43,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-09-21 10:29:43,742 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2020-09-21 10:29:43,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-09-21 10:29:43,744 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:43,744 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:43,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-09-21 10:29:43,745 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:43,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:43,745 INFO L82 PathProgramCache]: Analyzing trace with hash -370542859, now seen corresponding path program 44 times [2020-09-21 10:29:43,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:43,746 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230411795] [2020-09-21 10:29:43,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:43,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:45,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:45,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:45,238 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:45,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [230411795] [2020-09-21 10:29:45,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:45,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-09-21 10:29:45,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000884016] [2020-09-21 10:29:45,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-09-21 10:29:45,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:45,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-09-21 10:29:45,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-09-21 10:29:45,240 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 48 states. [2020-09-21 10:29:45,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:45,480 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2020-09-21 10:29:45,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-09-21 10:29:45,481 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 100 [2020-09-21 10:29:45,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:45,482 INFO L225 Difference]: With dead ends: 110 [2020-09-21 10:29:45,482 INFO L226 Difference]: Without dead ends: 104 [2020-09-21 10:29:45,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-09-21 10:29:45,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-09-21 10:29:45,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-09-21 10:29:45,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-09-21 10:29:45,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-09-21 10:29:45,489 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2020-09-21 10:29:45,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:45,489 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-09-21 10:29:45,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-09-21 10:29:45,489 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-09-21 10:29:45,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-09-21 10:29:45,490 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:45,490 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:45,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-09-21 10:29:45,490 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:45,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:45,491 INFO L82 PathProgramCache]: Analyzing trace with hash -450123625, now seen corresponding path program 45 times [2020-09-21 10:29:45,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:45,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1394558615] [2020-09-21 10:29:45,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:45,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:46,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:46,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:46,990 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:46,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1394558615] [2020-09-21 10:29:46,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:46,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-09-21 10:29:46,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269275877] [2020-09-21 10:29:46,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-09-21 10:29:46,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:46,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-09-21 10:29:46,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-09-21 10:29:46,992 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 49 states. [2020-09-21 10:29:47,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:47,210 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2020-09-21 10:29:47,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-09-21 10:29:47,211 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 102 [2020-09-21 10:29:47,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:47,212 INFO L225 Difference]: With dead ends: 112 [2020-09-21 10:29:47,212 INFO L226 Difference]: Without dead ends: 106 [2020-09-21 10:29:47,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-09-21 10:29:47,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-09-21 10:29:47,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-09-21 10:29:47,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-09-21 10:29:47,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-09-21 10:29:47,217 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2020-09-21 10:29:47,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:47,218 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-09-21 10:29:47,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-09-21 10:29:47,218 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-09-21 10:29:47,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-09-21 10:29:47,219 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:47,219 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:47,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-09-21 10:29:47,219 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:47,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:47,220 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 46 times [2020-09-21 10:29:47,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:47,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1828797580] [2020-09-21 10:29:47,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:47,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:48,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:48,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:48,842 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:48,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1828797580] [2020-09-21 10:29:48,843 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:48,843 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-09-21 10:29:48,843 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830866921] [2020-09-21 10:29:48,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-09-21 10:29:48,844 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:48,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-09-21 10:29:48,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-09-21 10:29:48,844 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 50 states. [2020-09-21 10:29:49,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:49,048 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2020-09-21 10:29:49,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-09-21 10:29:49,049 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2020-09-21 10:29:49,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:49,050 INFO L225 Difference]: With dead ends: 114 [2020-09-21 10:29:49,050 INFO L226 Difference]: Without dead ends: 108 [2020-09-21 10:29:49,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-09-21 10:29:49,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-09-21 10:29:49,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-09-21 10:29:49,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-09-21 10:29:49,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-09-21 10:29:49,056 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2020-09-21 10:29:49,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:49,056 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-09-21 10:29:49,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-09-21 10:29:49,057 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-09-21 10:29:49,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-09-21 10:29:49,057 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:49,057 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:49,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-09-21 10:29:49,058 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:49,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:49,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1353943643, now seen corresponding path program 47 times [2020-09-21 10:29:49,058 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:49,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1358046515] [2020-09-21 10:29:49,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:49,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:50,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,727 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:50,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1358046515] [2020-09-21 10:29:50,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:50,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-09-21 10:29:50,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252194637] [2020-09-21 10:29:50,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-09-21 10:29:50,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:50,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-09-21 10:29:50,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-09-21 10:29:50,729 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 51 states. [2020-09-21 10:29:50,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:50,926 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2020-09-21 10:29:50,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-09-21 10:29:50,927 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 106 [2020-09-21 10:29:50,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:50,928 INFO L225 Difference]: With dead ends: 116 [2020-09-21 10:29:50,928 INFO L226 Difference]: Without dead ends: 110 [2020-09-21 10:29:50,929 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-09-21 10:29:50,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-09-21 10:29:50,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-09-21 10:29:50,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-09-21 10:29:50,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2020-09-21 10:29:50,934 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2020-09-21 10:29:50,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:50,935 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2020-09-21 10:29:50,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-09-21 10:29:50,935 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2020-09-21 10:29:50,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-09-21 10:29:50,936 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:50,936 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:50,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-09-21 10:29:50,937 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:50,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:50,937 INFO L82 PathProgramCache]: Analyzing trace with hash -1075971459, now seen corresponding path program 48 times [2020-09-21 10:29:50,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:50,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [65296873] [2020-09-21 10:29:50,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:50,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:52,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:52,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:52,694 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:52,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [65296873] [2020-09-21 10:29:52,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:52,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-09-21 10:29:52,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771114421] [2020-09-21 10:29:52,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-09-21 10:29:52,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:52,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-09-21 10:29:52,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-09-21 10:29:52,696 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 52 states. [2020-09-21 10:29:52,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:52,947 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2020-09-21 10:29:52,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-09-21 10:29:52,948 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 108 [2020-09-21 10:29:52,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:52,949 INFO L225 Difference]: With dead ends: 118 [2020-09-21 10:29:52,949 INFO L226 Difference]: Without dead ends: 112 [2020-09-21 10:29:52,950 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-09-21 10:29:52,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-09-21 10:29:52,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-09-21 10:29:52,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-09-21 10:29:52,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2020-09-21 10:29:52,955 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2020-09-21 10:29:52,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:52,955 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2020-09-21 10:29:52,955 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-09-21 10:29:52,955 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2020-09-21 10:29:52,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-09-21 10:29:52,956 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:52,956 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:52,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-09-21 10:29:52,956 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:52,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:52,957 INFO L82 PathProgramCache]: Analyzing trace with hash 237824543, now seen corresponding path program 49 times [2020-09-21 10:29:52,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:52,957 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [767831877] [2020-09-21 10:29:52,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:52,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:54,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:54,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:54,820 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:54,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [767831877] [2020-09-21 10:29:54,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:54,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-09-21 10:29:54,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53744332] [2020-09-21 10:29:54,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-09-21 10:29:54,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:54,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-09-21 10:29:54,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-09-21 10:29:54,822 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 53 states. [2020-09-21 10:29:55,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:55,092 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2020-09-21 10:29:55,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-09-21 10:29:55,093 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 110 [2020-09-21 10:29:55,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:55,094 INFO L225 Difference]: With dead ends: 120 [2020-09-21 10:29:55,095 INFO L226 Difference]: Without dead ends: 114 [2020-09-21 10:29:55,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-09-21 10:29:55,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-09-21 10:29:55,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-09-21 10:29:55,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-09-21 10:29:55,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2020-09-21 10:29:55,101 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2020-09-21 10:29:55,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:55,102 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2020-09-21 10:29:55,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-09-21 10:29:55,103 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2020-09-21 10:29:55,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-09-21 10:29:55,104 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:55,105 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:55,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-09-21 10:29:55,105 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:55,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:55,106 INFO L82 PathProgramCache]: Analyzing trace with hash 75397441, now seen corresponding path program 50 times [2020-09-21 10:29:55,108 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:55,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [879496314] [2020-09-21 10:29:55,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:55,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:56,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:56,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:56,906 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:56,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [879496314] [2020-09-21 10:29:56,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:56,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-09-21 10:29:56,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512602177] [2020-09-21 10:29:56,907 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-09-21 10:29:56,907 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:56,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-09-21 10:29:56,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-09-21 10:29:56,908 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 54 states. [2020-09-21 10:29:57,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:57,281 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2020-09-21 10:29:57,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-09-21 10:29:57,281 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 112 [2020-09-21 10:29:57,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:57,283 INFO L225 Difference]: With dead ends: 122 [2020-09-21 10:29:57,283 INFO L226 Difference]: Without dead ends: 116 [2020-09-21 10:29:57,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-09-21 10:29:57,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-09-21 10:29:57,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-09-21 10:29:57,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-09-21 10:29:57,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2020-09-21 10:29:57,288 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2020-09-21 10:29:57,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:57,289 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2020-09-21 10:29:57,289 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-09-21 10:29:57,289 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2020-09-21 10:29:57,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-09-21 10:29:57,289 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:57,290 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:57,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-09-21 10:29:57,290 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:57,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:57,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1398224925, now seen corresponding path program 51 times [2020-09-21 10:29:57,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:57,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1526124054] [2020-09-21 10:29:57,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:57,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:59,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:59,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:59,220 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:59,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1526124054] [2020-09-21 10:29:59,220 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:59,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-09-21 10:29:59,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194165691] [2020-09-21 10:29:59,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-09-21 10:29:59,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:59,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-09-21 10:29:59,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-09-21 10:29:59,222 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 55 states. [2020-09-21 10:29:59,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:59,601 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2020-09-21 10:29:59,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-09-21 10:29:59,602 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 114 [2020-09-21 10:29:59,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:59,604 INFO L225 Difference]: With dead ends: 124 [2020-09-21 10:29:59,604 INFO L226 Difference]: Without dead ends: 118 [2020-09-21 10:29:59,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-09-21 10:29:59,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-09-21 10:29:59,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2020-09-21 10:29:59,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-09-21 10:29:59,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2020-09-21 10:29:59,608 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2020-09-21 10:29:59,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:59,608 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2020-09-21 10:29:59,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-09-21 10:29:59,609 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2020-09-21 10:29:59,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-09-21 10:29:59,609 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:59,610 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:59,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-09-21 10:29:59,610 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:59,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:59,610 INFO L82 PathProgramCache]: Analyzing trace with hash -210110971, now seen corresponding path program 52 times [2020-09-21 10:29:59,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:59,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [674458558] [2020-09-21 10:29:59,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:59,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:01,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:01,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:01,576 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:01,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [674458558] [2020-09-21 10:30:01,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:01,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-09-21 10:30:01,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921282417] [2020-09-21 10:30:01,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-09-21 10:30:01,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:01,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-09-21 10:30:01,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-09-21 10:30:01,578 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 56 states. [2020-09-21 10:30:01,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:01,969 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2020-09-21 10:30:01,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-09-21 10:30:01,969 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2020-09-21 10:30:01,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:01,971 INFO L225 Difference]: With dead ends: 126 [2020-09-21 10:30:01,971 INFO L226 Difference]: Without dead ends: 120 [2020-09-21 10:30:01,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-09-21 10:30:01,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-09-21 10:30:01,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2020-09-21 10:30:01,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-09-21 10:30:01,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2020-09-21 10:30:01,977 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2020-09-21 10:30:01,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:01,977 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2020-09-21 10:30:01,977 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-09-21 10:30:01,977 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2020-09-21 10:30:01,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-09-21 10:30:01,978 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:01,978 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:01,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-09-21 10:30:01,979 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:01,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:01,979 INFO L82 PathProgramCache]: Analyzing trace with hash -893901913, now seen corresponding path program 53 times [2020-09-21 10:30:01,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:01,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [948269941] [2020-09-21 10:30:01,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:02,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat