/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.8 -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 0.1.25-5644d1e-m [2020-08-19 02:05:13,517 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 02:05:13,520 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 02:05:13,556 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 02:05:13,556 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 02:05:13,565 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 02:05:13,567 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 02:05:13,571 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 02:05:13,573 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 02:05:13,576 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 02:05:13,577 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 02:05:13,579 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 02:05:13,579 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 02:05:13,582 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 02:05:13,584 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 02:05:13,586 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 02:05:13,587 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 02:05:13,588 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 02:05:13,590 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 02:05:13,598 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 02:05:13,600 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 02:05:13,601 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 02:05:13,602 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 02:05:13,603 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 02:05:13,615 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 02:05:13,630 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 02:05:13,631 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 02:05:13,632 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 02:05:13,633 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 02:05:13,678 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 02:05:13,678 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 02:05:13,679 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 02:05:13,679 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 02:05:13,680 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 02:05:13,680 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 02:05:13,680 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 02:05:13,681 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 02:05:13,681 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 02:05:13,681 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 02:05:13,682 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 02:05:13,682 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 02:05:13,682 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 02:05:13,683 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 02:05:13,683 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 02:05:13,683 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 02:05:13,683 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 02:05:13,684 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 02:05:13,684 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 02:05:13,684 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 02:05:13,684 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 02:05:13,685 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:05:13,685 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 02:05:13,685 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 02:05:13,685 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 02:05:13,685 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 02:05:13,686 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 02:05:13,686 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 02:05:13,686 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 02:05:13,686 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; [2020-08-19 02:05:14,021 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 02:05:14,035 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 02:05:14,041 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 02:05:14,043 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 02:05:14,043 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 02:05:14,044 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-19 02:05:14,105 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5206a3655/83c10123ed414923a9921b00bbf621a2/FLAG930cfee4d [2020-08-19 02:05:14,550 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 02:05:14,551 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-19 02:05:14,557 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5206a3655/83c10123ed414923a9921b00bbf621a2/FLAG930cfee4d [2020-08-19 02:05:14,943 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5206a3655/83c10123ed414923a9921b00bbf621a2 [2020-08-19 02:05:14,954 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 02:05:14,956 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 02:05:14,957 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 02:05:14,957 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 02:05:14,961 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 02:05:14,962 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:05:14" (1/1) ... [2020-08-19 02:05:14,965 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4b5d0024 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:14, skipping insertion in model container [2020-08-19 02:05:14,965 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:05:14" (1/1) ... [2020-08-19 02:05:14,973 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 02:05:14,989 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 02:05:15,163 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:05:15,167 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 02:05:15,185 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:05:15,203 INFO L208 MainTranslator]: Completed translation [2020-08-19 02:05:15,203 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:15 WrapperNode [2020-08-19 02:05:15,203 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 02:05:15,204 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 02:05:15,204 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 02:05:15,204 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 02:05:15,294 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:15" (1/1) ... [2020-08-19 02:05:15,294 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:15" (1/1) ... [2020-08-19 02:05:15,303 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:15" (1/1) ... [2020-08-19 02:05:15,304 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:15" (1/1) ... [2020-08-19 02:05:15,311 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:15" (1/1) ... [2020-08-19 02:05:15,317 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:15" (1/1) ... [2020-08-19 02:05:15,318 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:15" (1/1) ... [2020-08-19 02:05:15,325 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 02:05:15,326 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 02:05:15,326 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 02:05:15,326 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 02:05:15,327 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:15" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:05:15,388 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 02:05:15,389 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 02:05:15,389 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 02:05:15,389 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 02:05:15,389 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 02:05:15,389 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 02:05:15,390 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 02:05:15,390 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 02:05:15,390 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-19 02:05:15,390 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-19 02:05:15,390 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 02:05:15,390 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 02:05:15,391 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 02:05:15,603 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 02:05:15,603 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 02:05:15,608 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:05:15 BoogieIcfgContainer [2020-08-19 02:05:15,608 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 02:05:15,609 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 02:05:15,610 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 02:05:15,613 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 02:05:15,613 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 02:05:14" (1/3) ... [2020-08-19 02:05:15,614 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@104db30c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:05:15, skipping insertion in model container [2020-08-19 02:05:15,614 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:15" (2/3) ... [2020-08-19 02:05:15,615 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@104db30c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:05:15, skipping insertion in model container [2020-08-19 02:05:15,615 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:05:15" (3/3) ... [2020-08-19 02:05:15,617 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-08-19 02:05:15,630 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 02:05:15,637 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 02:05:15,652 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 02:05:15,674 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 02:05:15,675 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 02:05:15,675 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 02:05:15,675 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 02:05:15,675 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 02:05:15,675 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 02:05:15,675 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 02:05:15,676 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 02:05:15,692 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-19 02:05:15,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 02:05:15,698 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:15,699 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:15,699 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:15,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:15,705 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-08-19 02:05:15,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:15,713 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [130549815] [2020-08-19 02:05:15,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:15,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:15,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:15,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:15,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:15,897 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [130549815] [2020-08-19 02:05:15,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:05:15,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 02:05:15,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009021615] [2020-08-19 02:05:15,907 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 02:05:15,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:15,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 02:05:15,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 02:05:15,933 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-08-19 02:05:16,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:16,010 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-08-19 02:05:16,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 02:05:16,014 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-08-19 02:05:16,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:16,025 INFO L225 Difference]: With dead ends: 34 [2020-08-19 02:05:16,026 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 02:05:16,030 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 [2020-08-19 02:05:16,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 02:05:16,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 02:05:16,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 02:05:16,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-19 02:05:16,113 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-19 02:05:16,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:16,117 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-19 02:05:16,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 02:05:16,118 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-19 02:05:16,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 02:05:16,122 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:16,122 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:16,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 02:05:16,123 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:16,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:16,124 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-08-19 02:05:16,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:16,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [238996614] [2020-08-19 02:05:16,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:16,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:16,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:16,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:16,224 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:16,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [238996614] [2020-08-19 02:05:16,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:05:16,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 02:05:16,226 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525818234] [2020-08-19 02:05:16,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 02:05:16,228 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:16,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 02:05:16,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:05:16,229 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2020-08-19 02:05:16,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:16,273 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-19 02:05:16,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 02:05:16,274 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-19 02:05:16,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:16,275 INFO L225 Difference]: With dead ends: 22 [2020-08-19 02:05:16,275 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 02:05:16,277 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 [2020-08-19 02:05:16,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 02:05:16,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-19 02:05:16,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 02:05:16,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-19 02:05:16,283 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-19 02:05:16,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:16,284 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-19 02:05:16,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 02:05:16,284 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-19 02:05:16,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 02:05:16,285 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:16,285 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:16,285 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 02:05:16,286 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:16,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:16,286 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-08-19 02:05:16,286 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:16,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1885565351] [2020-08-19 02:05:16,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:16,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:16,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:16,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:16,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:16,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1885565351] [2020-08-19 02:05:16,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:16,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 02:05:16,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533554215] [2020-08-19 02:05:16,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:05:16,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:16,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:05:16,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:05:16,361 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-19 02:05:16,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:16,423 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-19 02:05:16,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:05:16,424 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-19 02:05:16,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:16,425 INFO L225 Difference]: With dead ends: 24 [2020-08-19 02:05:16,425 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 02:05:16,429 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 [2020-08-19 02:05:16,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 02:05:16,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-19 02:05:16,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 02:05:16,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 02:05:16,439 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-19 02:05:16,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:16,439 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 02:05:16,439 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:05:16,439 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 02:05:16,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 02:05:16,440 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:16,440 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:16,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 02:05:16,441 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:16,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:16,441 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2020-08-19 02:05:16,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:16,442 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1191690957] [2020-08-19 02:05:16,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:16,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:16,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:16,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:16,545 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:16,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1191690957] [2020-08-19 02:05:16,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:16,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 02:05:16,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316742689] [2020-08-19 02:05:16,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 02:05:16,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:16,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 02:05:16,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:05:16,548 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-19 02:05:16,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:16,610 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 02:05:16,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 02:05:16,611 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-19 02:05:16,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:16,612 INFO L225 Difference]: With dead ends: 26 [2020-08-19 02:05:16,612 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 02:05:16,613 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 [2020-08-19 02:05:16,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 02:05:16,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-19 02:05:16,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 02:05:16,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-19 02:05:16,619 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-19 02:05:16,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:16,619 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-19 02:05:16,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 02:05:16,620 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-19 02:05:16,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 02:05:16,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:16,621 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:16,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 02:05:16,621 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:16,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:16,622 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2020-08-19 02:05:16,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:16,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [808722688] [2020-08-19 02:05:16,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:16,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:16,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:16,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:16,736 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:16,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [808722688] [2020-08-19 02:05:16,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:16,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 02:05:16,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110312602] [2020-08-19 02:05:16,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 02:05:16,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:16,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 02:05:16,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-19 02:05:16,740 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-19 02:05:16,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:16,795 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-19 02:05:16,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 02:05:16,796 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-19 02:05:16,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:16,797 INFO L225 Difference]: With dead ends: 28 [2020-08-19 02:05:16,797 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 02:05:16,798 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 [2020-08-19 02:05:16,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 02:05:16,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-19 02:05:16,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 02:05:16,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-19 02:05:16,804 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-19 02:05:16,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:16,805 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-19 02:05:16,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 02:05:16,805 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-19 02:05:16,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 02:05:16,806 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:16,807 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:16,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 02:05:16,807 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:16,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:16,808 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2020-08-19 02:05:16,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:16,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [80579536] [2020-08-19 02:05:16,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:16,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:16,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:16,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:16,924 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:16,924 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [80579536] [2020-08-19 02:05:16,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:16,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 02:05:16,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126388037] [2020-08-19 02:05:16,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 02:05:16,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:16,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 02:05:16,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-19 02:05:16,927 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-19 02:05:16,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:16,987 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-19 02:05:16,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 02:05:16,988 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-19 02:05:16,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:16,989 INFO L225 Difference]: With dead ends: 30 [2020-08-19 02:05:16,989 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 02:05:16,990 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 [2020-08-19 02:05:16,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 02:05:16,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-19 02:05:16,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 02:05:16,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 02:05:16,996 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-19 02:05:16,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:16,996 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 02:05:16,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 02:05:16,997 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 02:05:16,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 02:05:16,997 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:16,998 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:16,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 02:05:16,998 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:16,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:16,999 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2020-08-19 02:05:16,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:16,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [214914536] [2020-08-19 02:05:16,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:17,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:17,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:17,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:17,118 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:17,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [214914536] [2020-08-19 02:05:17,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:17,120 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 02:05:17,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492035372] [2020-08-19 02:05:17,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 02:05:17,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:17,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 02:05:17,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-19 02:05:17,122 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-19 02:05:17,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:17,199 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 02:05:17,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 02:05:17,200 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-19 02:05:17,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:17,201 INFO L225 Difference]: With dead ends: 32 [2020-08-19 02:05:17,201 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 02:05:17,202 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 [2020-08-19 02:05:17,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 02:05:17,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-19 02:05:17,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 02:05:17,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-19 02:05:17,212 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-19 02:05:17,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:17,213 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-19 02:05:17,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 02:05:17,213 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-19 02:05:17,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 02:05:17,214 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:17,214 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:17,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 02:05:17,215 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:17,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:17,215 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2020-08-19 02:05:17,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:17,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [549383382] [2020-08-19 02:05:17,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:17,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:17,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:17,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:17,366 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:17,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [549383382] [2020-08-19 02:05:17,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:17,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 02:05:17,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268259374] [2020-08-19 02:05:17,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 02:05:17,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:17,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 02:05:17,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:05:17,371 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-19 02:05:17,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:17,471 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-19 02:05:17,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 02:05:17,472 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-19 02:05:17,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:17,473 INFO L225 Difference]: With dead ends: 34 [2020-08-19 02:05:17,473 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 02:05:17,474 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 [2020-08-19 02:05:17,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 02:05:17,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-19 02:05:17,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 02:05:17,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-19 02:05:17,483 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-19 02:05:17,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:17,483 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-19 02:05:17,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 02:05:17,483 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-19 02:05:17,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 02:05:17,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:17,489 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:17,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 02:05:17,489 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:17,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:17,490 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2020-08-19 02:05:17,490 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:17,490 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050358438] [2020-08-19 02:05:17,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:17,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:17,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:17,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:17,639 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:17,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050358438] [2020-08-19 02:05:17,640 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:17,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 02:05:17,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027044042] [2020-08-19 02:05:17,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 02:05:17,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:17,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 02:05:17,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-19 02:05:17,647 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 11 states. [2020-08-19 02:05:17,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:17,725 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-19 02:05:17,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 02:05:17,726 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2020-08-19 02:05:17,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:17,727 INFO L225 Difference]: With dead ends: 36 [2020-08-19 02:05:17,727 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 02:05:17,728 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 [2020-08-19 02:05:17,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 02:05:17,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-19 02:05:17,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 02:05:17,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 02:05:17,740 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-19 02:05:17,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:17,740 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 02:05:17,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 02:05:17,741 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 02:05:17,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 02:05:17,743 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:17,743 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:17,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 02:05:17,746 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:17,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:17,746 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2020-08-19 02:05:17,747 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:17,747 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31338787] [2020-08-19 02:05:17,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:17,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:17,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:17,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:17,922 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:17,923 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31338787] [2020-08-19 02:05:17,923 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:17,923 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 02:05:17,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115752421] [2020-08-19 02:05:17,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 02:05:17,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:17,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 02:05:17,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-19 02:05:17,925 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 12 states. [2020-08-19 02:05:18,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:18,016 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 02:05:18,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 02:05:18,017 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-08-19 02:05:18,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:18,018 INFO L225 Difference]: With dead ends: 38 [2020-08-19 02:05:18,018 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 02:05:18,019 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-19 02:05:18,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 02:05:18,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-19 02:05:18,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 02:05:18,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-19 02:05:18,028 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-08-19 02:05:18,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:18,029 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-19 02:05:18,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 02:05:18,030 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-19 02:05:18,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 02:05:18,034 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:18,034 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:18,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 02:05:18,035 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:18,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:18,037 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2020-08-19 02:05:18,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:18,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [685572474] [2020-08-19 02:05:18,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:18,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:18,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:18,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:18,219 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:18,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [685572474] [2020-08-19 02:05:18,220 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:18,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 02:05:18,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884157117] [2020-08-19 02:05:18,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 02:05:18,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:18,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 02:05:18,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-19 02:05:18,221 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 13 states. [2020-08-19 02:05:18,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:18,285 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-19 02:05:18,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 02:05:18,285 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-08-19 02:05:18,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:18,286 INFO L225 Difference]: With dead ends: 40 [2020-08-19 02:05:18,286 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 02:05:18,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-19 02:05:18,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 02:05:18,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-19 02:05:18,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 02:05:18,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-19 02:05:18,292 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-08-19 02:05:18,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:18,292 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-19 02:05:18,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 02:05:18,293 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-19 02:05:18,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 02:05:18,293 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:18,293 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:18,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 02:05:18,294 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:18,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:18,294 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2020-08-19 02:05:18,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:18,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1833410773] [2020-08-19 02:05:18,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:18,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:18,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:18,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:18,460 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:18,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1833410773] [2020-08-19 02:05:18,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:18,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 02:05:18,461 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553510942] [2020-08-19 02:05:18,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 02:05:18,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:18,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 02:05:18,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-19 02:05:18,462 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-08-19 02:05:18,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:18,530 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-19 02:05:18,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 02:05:18,531 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-08-19 02:05:18,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:18,531 INFO L225 Difference]: With dead ends: 42 [2020-08-19 02:05:18,532 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 02:05:18,532 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-19 02:05:18,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 02:05:18,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-19 02:05:18,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 02:05:18,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 02:05:18,537 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-08-19 02:05:18,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:18,538 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 02:05:18,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 02:05:18,538 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 02:05:18,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 02:05:18,539 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:18,539 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:18,539 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 02:05:18,539 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:18,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:18,540 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2020-08-19 02:05:18,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:18,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127258038] [2020-08-19 02:05:18,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:18,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:18,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:18,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:18,687 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:18,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127258038] [2020-08-19 02:05:18,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:18,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 02:05:18,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904364627] [2020-08-19 02:05:18,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 02:05:18,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:18,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 02:05:18,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-19 02:05:18,689 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 15 states. [2020-08-19 02:05:18,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:18,790 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 02:05:18,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 02:05:18,791 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2020-08-19 02:05:18,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:18,791 INFO L225 Difference]: With dead ends: 44 [2020-08-19 02:05:18,792 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 02:05:18,792 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 [2020-08-19 02:05:18,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 02:05:18,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-19 02:05:18,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 02:05:18,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-19 02:05:18,800 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-08-19 02:05:18,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:18,804 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-19 02:05:18,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 02:05:18,804 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-19 02:05:18,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 02:05:18,804 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:18,805 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:18,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 02:05:18,805 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:18,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:18,805 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2020-08-19 02:05:18,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:18,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568180989] [2020-08-19 02:05:18,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:18,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:19,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:19,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:19,129 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:19,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568180989] [2020-08-19 02:05:19,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:19,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 02:05:19,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032513854] [2020-08-19 02:05:19,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 02:05:19,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:19,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 02:05:19,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-19 02:05:19,132 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 16 states. [2020-08-19 02:05:19,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:19,235 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-19 02:05:19,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 02:05:19,236 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-08-19 02:05:19,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:19,236 INFO L225 Difference]: With dead ends: 46 [2020-08-19 02:05:19,237 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 02:05:19,237 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-19 02:05:19,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 02:05:19,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-19 02:05:19,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 02:05:19,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-19 02:05:19,242 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-08-19 02:05:19,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:19,242 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-19 02:05:19,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 02:05:19,243 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-19 02:05:19,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 02:05:19,243 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:19,243 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:19,244 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 02:05:19,244 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:19,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:19,244 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2020-08-19 02:05:19,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:19,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1181420496] [2020-08-19 02:05:19,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:19,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:19,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:19,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:19,412 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:19,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1181420496] [2020-08-19 02:05:19,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:19,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 02:05:19,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248156252] [2020-08-19 02:05:19,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 02:05:19,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:19,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 02:05:19,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-19 02:05:19,414 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 17 states. [2020-08-19 02:05:19,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:19,502 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-19 02:05:19,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 02:05:19,502 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-08-19 02:05:19,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:19,503 INFO L225 Difference]: With dead ends: 48 [2020-08-19 02:05:19,503 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 02:05:19,504 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 [2020-08-19 02:05:19,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 02:05:19,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-19 02:05:19,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 02:05:19,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 02:05:19,509 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-08-19 02:05:19,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:19,509 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 02:05:19,509 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 02:05:19,509 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 02:05:19,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 02:05:19,510 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:19,510 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:19,510 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 02:05:19,510 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:19,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:19,511 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2020-08-19 02:05:19,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:19,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1628329972] [2020-08-19 02:05:19,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:19,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:19,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:19,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:19,685 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:19,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1628329972] [2020-08-19 02:05:19,686 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:19,686 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 02:05:19,686 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165132689] [2020-08-19 02:05:19,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 02:05:19,687 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:19,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 02:05:19,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-19 02:05:19,688 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 18 states. [2020-08-19 02:05:19,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:19,787 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 02:05:19,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 02:05:19,787 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-19 02:05:19,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:19,788 INFO L225 Difference]: With dead ends: 50 [2020-08-19 02:05:19,788 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 02:05:19,789 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 [2020-08-19 02:05:19,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 02:05:19,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-19 02:05:19,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 02:05:19,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-19 02:05:19,794 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-08-19 02:05:19,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:19,794 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-19 02:05:19,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 02:05:19,794 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-19 02:05:19,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 02:05:19,795 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:19,795 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:19,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 02:05:19,796 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:19,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:19,796 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2020-08-19 02:05:19,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:19,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [793562375] [2020-08-19 02:05:19,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:19,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:20,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:20,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:20,060 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:20,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [793562375] [2020-08-19 02:05:20,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:20,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 02:05:20,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257319257] [2020-08-19 02:05:20,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 02:05:20,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:20,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 02:05:20,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-19 02:05:20,065 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 19 states. [2020-08-19 02:05:20,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:20,191 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-19 02:05:20,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 02:05:20,191 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2020-08-19 02:05:20,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:20,192 INFO L225 Difference]: With dead ends: 52 [2020-08-19 02:05:20,192 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 02:05:20,193 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-19 02:05:20,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 02:05:20,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-19 02:05:20,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 02:05:20,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-19 02:05:20,197 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-08-19 02:05:20,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:20,197 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-19 02:05:20,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 02:05:20,198 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-19 02:05:20,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 02:05:20,198 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:20,199 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:20,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 02:05:20,199 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:20,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:20,199 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2020-08-19 02:05:20,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:20,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [396759585] [2020-08-19 02:05:20,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:20,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:20,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:20,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:20,433 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:20,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [396759585] [2020-08-19 02:05:20,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:20,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 02:05:20,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645700117] [2020-08-19 02:05:20,437 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 02:05:20,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:20,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 02:05:20,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-19 02:05:20,438 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 20 states. [2020-08-19 02:05:20,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:20,559 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-19 02:05:20,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 02:05:20,559 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2020-08-19 02:05:20,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:20,560 INFO L225 Difference]: With dead ends: 54 [2020-08-19 02:05:20,561 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 02:05:20,562 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-19 02:05:20,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 02:05:20,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-19 02:05:20,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 02:05:20,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-19 02:05:20,568 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-08-19 02:05:20,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:20,569 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-19 02:05:20,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 02:05:20,569 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-19 02:05:20,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 02:05:20,570 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:20,570 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:20,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 02:05:20,570 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:20,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:20,571 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2020-08-19 02:05:20,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:20,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [561282659] [2020-08-19 02:05:20,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:20,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:20,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:20,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:20,799 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:20,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [561282659] [2020-08-19 02:05:20,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:20,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 02:05:20,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190103018] [2020-08-19 02:05:20,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 02:05:20,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:20,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 02:05:20,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-19 02:05:20,801 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 21 states. [2020-08-19 02:05:20,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:20,918 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-19 02:05:20,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 02:05:20,919 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2020-08-19 02:05:20,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:20,920 INFO L225 Difference]: With dead ends: 56 [2020-08-19 02:05:20,921 INFO L226 Difference]: Without dead ends: 50 [2020-08-19 02:05:20,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-19 02:05:20,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-19 02:05:20,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-19 02:05:20,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 02:05:20,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-19 02:05:20,927 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-08-19 02:05:20,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:20,928 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-19 02:05:20,928 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 02:05:20,928 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-19 02:05:20,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 02:05:20,929 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:20,929 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:20,929 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 02:05:20,929 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:20,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:20,930 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2020-08-19 02:05:20,930 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:20,930 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1843732571] [2020-08-19 02:05:20,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:20,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:21,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:21,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:21,257 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:21,258 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1843732571] [2020-08-19 02:05:21,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:21,258 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 02:05:21,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148374342] [2020-08-19 02:05:21,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 02:05:21,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:21,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 02:05:21,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-19 02:05:21,260 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 22 states. [2020-08-19 02:05:21,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:21,351 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-19 02:05:21,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 02:05:21,351 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2020-08-19 02:05:21,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:21,352 INFO L225 Difference]: With dead ends: 58 [2020-08-19 02:05:21,353 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 02:05:21,353 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 [2020-08-19 02:05:21,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 02:05:21,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-19 02:05:21,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 02:05:21,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-19 02:05:21,367 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-08-19 02:05:21,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:21,367 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-19 02:05:21,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 02:05:21,368 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-19 02:05:21,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 02:05:21,371 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:21,371 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:21,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 02:05:21,372 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:21,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:21,372 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2020-08-19 02:05:21,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:21,374 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2026646259] [2020-08-19 02:05:21,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:21,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:21,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:21,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:21,663 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:21,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2026646259] [2020-08-19 02:05:21,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:21,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 02:05:21,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472198255] [2020-08-19 02:05:21,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 02:05:21,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:21,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 02:05:21,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-19 02:05:21,666 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 23 states. [2020-08-19 02:05:21,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:21,814 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-19 02:05:21,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 02:05:21,814 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2020-08-19 02:05:21,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:21,815 INFO L225 Difference]: With dead ends: 60 [2020-08-19 02:05:21,815 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 02:05:21,816 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 [2020-08-19 02:05:21,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 02:05:21,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-19 02:05:21,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 02:05:21,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-19 02:05:21,824 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-08-19 02:05:21,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:21,824 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-19 02:05:21,824 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 02:05:21,824 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-19 02:05:21,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 02:05:21,830 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:21,830 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:21,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 02:05:21,831 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:21,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:21,832 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2020-08-19 02:05:21,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:21,832 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574775106] [2020-08-19 02:05:21,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:21,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:22,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:22,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:22,144 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:22,149 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574775106] [2020-08-19 02:05:22,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:22,149 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 02:05:22,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046656851] [2020-08-19 02:05:22,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 02:05:22,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:22,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 02:05:22,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-19 02:05:22,152 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 24 states. [2020-08-19 02:05:22,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:22,242 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-19 02:05:22,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 02:05:22,245 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 52 [2020-08-19 02:05:22,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:22,246 INFO L225 Difference]: With dead ends: 62 [2020-08-19 02:05:22,246 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 02:05:22,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-19 02:05:22,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 02:05:22,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-19 02:05:22,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 02:05:22,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-19 02:05:22,250 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-08-19 02:05:22,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:22,251 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-19 02:05:22,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 02:05:22,251 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-19 02:05:22,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 02:05:22,252 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:22,252 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:22,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 02:05:22,252 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:22,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:22,253 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2020-08-19 02:05:22,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:22,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1107942568] [2020-08-19 02:05:22,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:22,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:22,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:22,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:22,527 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:22,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1107942568] [2020-08-19 02:05:22,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:22,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 02:05:22,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745581829] [2020-08-19 02:05:22,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 02:05:22,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:22,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 02:05:22,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-19 02:05:22,530 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 25 states. [2020-08-19 02:05:22,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:22,645 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-19 02:05:22,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 02:05:22,645 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2020-08-19 02:05:22,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:22,646 INFO L225 Difference]: With dead ends: 64 [2020-08-19 02:05:22,646 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 02:05:22,647 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-19 02:05:22,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 02:05:22,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-19 02:05:22,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 02:05:22,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-19 02:05:22,657 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-08-19 02:05:22,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:22,657 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-19 02:05:22,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 02:05:22,658 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-19 02:05:22,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 02:05:22,661 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:22,661 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:22,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 02:05:22,661 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:22,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:22,662 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2020-08-19 02:05:22,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:22,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1465281760] [2020-08-19 02:05:22,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:22,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:22,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:22,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:22,996 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:22,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1465281760] [2020-08-19 02:05:22,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:22,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 02:05:22,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713655474] [2020-08-19 02:05:22,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 02:05:22,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:22,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 02:05:22,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-19 02:05:22,999 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 26 states. [2020-08-19 02:05:23,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:23,144 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-08-19 02:05:23,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 02:05:23,144 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 56 [2020-08-19 02:05:23,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:23,146 INFO L225 Difference]: With dead ends: 66 [2020-08-19 02:05:23,146 INFO L226 Difference]: Without dead ends: 60 [2020-08-19 02:05:23,147 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 [2020-08-19 02:05:23,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-19 02:05:23,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-19 02:05:23,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-19 02:05:23,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-19 02:05:23,151 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-08-19 02:05:23,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:23,152 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-19 02:05:23,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 02:05:23,152 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-19 02:05:23,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-19 02:05:23,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:23,153 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:23,155 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 02:05:23,156 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:23,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:23,157 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2020-08-19 02:05:23,157 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:23,157 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006758959] [2020-08-19 02:05:23,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:23,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:23,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:23,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:23,536 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:23,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006758959] [2020-08-19 02:05:23,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:23,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 02:05:23,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12928487] [2020-08-19 02:05:23,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 02:05:23,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:23,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 02:05:23,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-19 02:05:23,538 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 27 states. [2020-08-19 02:05:23,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:23,671 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-08-19 02:05:23,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 02:05:23,671 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 58 [2020-08-19 02:05:23,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:23,672 INFO L225 Difference]: With dead ends: 68 [2020-08-19 02:05:23,672 INFO L226 Difference]: Without dead ends: 62 [2020-08-19 02:05:23,673 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-19 02:05:23,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-19 02:05:23,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-19 02:05:23,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-19 02:05:23,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-08-19 02:05:23,677 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-08-19 02:05:23,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:23,678 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-08-19 02:05:23,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 02:05:23,678 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-08-19 02:05:23,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-19 02:05:23,679 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:23,679 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:23,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 02:05:23,679 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:23,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:23,680 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2020-08-19 02:05:23,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:23,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [658062824] [2020-08-19 02:05:23,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:23,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:24,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:24,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:24,124 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:24,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [658062824] [2020-08-19 02:05:24,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:24,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 02:05:24,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114015139] [2020-08-19 02:05:24,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 02:05:24,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:24,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 02:05:24,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-19 02:05:24,127 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 28 states. [2020-08-19 02:05:24,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:24,300 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-08-19 02:05:24,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 02:05:24,301 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 60 [2020-08-19 02:05:24,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:24,302 INFO L225 Difference]: With dead ends: 70 [2020-08-19 02:05:24,302 INFO L226 Difference]: Without dead ends: 64 [2020-08-19 02:05:24,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-19 02:05:24,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-19 02:05:24,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-19 02:05:24,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-19 02:05:24,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-08-19 02:05:24,306 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-08-19 02:05:24,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:24,306 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-08-19 02:05:24,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 02:05:24,306 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-08-19 02:05:24,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-19 02:05:24,307 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:24,307 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:24,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 02:05:24,307 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:24,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:24,308 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2020-08-19 02:05:24,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:24,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1014257379] [2020-08-19 02:05:24,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:24,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:24,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:24,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:24,752 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:24,752 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1014257379] [2020-08-19 02:05:24,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:24,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 02:05:24,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457566927] [2020-08-19 02:05:24,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 02:05:24,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:24,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 02:05:24,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-19 02:05:24,754 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 29 states. [2020-08-19 02:05:24,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:24,928 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-08-19 02:05:24,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 02:05:24,928 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2020-08-19 02:05:24,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:24,930 INFO L225 Difference]: With dead ends: 72 [2020-08-19 02:05:24,930 INFO L226 Difference]: Without dead ends: 66 [2020-08-19 02:05:24,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-19 02:05:24,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-19 02:05:24,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-19 02:05:24,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-19 02:05:24,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-08-19 02:05:24,935 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-08-19 02:05:24,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:24,936 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-08-19 02:05:24,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 02:05:24,936 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-08-19 02:05:24,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-19 02:05:24,936 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:24,937 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:24,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 02:05:24,937 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:24,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:24,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2020-08-19 02:05:24,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:24,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1914249406] [2020-08-19 02:05:24,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:24,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:25,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:25,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:25,496 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:25,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1914249406] [2020-08-19 02:05:25,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:25,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 02:05:25,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476462166] [2020-08-19 02:05:25,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 02:05:25,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:25,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 02:05:25,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-19 02:05:25,499 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 30 states. [2020-08-19 02:05:25,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:25,660 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-08-19 02:05:25,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 02:05:25,661 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 64 [2020-08-19 02:05:25,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:25,662 INFO L225 Difference]: With dead ends: 74 [2020-08-19 02:05:25,662 INFO L226 Difference]: Without dead ends: 68 [2020-08-19 02:05:25,663 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 [2020-08-19 02:05:25,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-19 02:05:25,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-19 02:05:25,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-19 02:05:25,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-08-19 02:05:25,667 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-08-19 02:05:25,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:25,668 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-08-19 02:05:25,668 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 02:05:25,668 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-08-19 02:05:25,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-19 02:05:25,668 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:25,669 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:25,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 02:05:25,669 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:25,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:25,669 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2020-08-19 02:05:25,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:25,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [599168907] [2020-08-19 02:05:25,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:25,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:26,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:26,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:26,226 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:26,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [599168907] [2020-08-19 02:05:26,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:26,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 02:05:26,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112514893] [2020-08-19 02:05:26,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 02:05:26,228 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:26,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 02:05:26,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-19 02:05:26,230 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 31 states. [2020-08-19 02:05:26,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:26,461 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-08-19 02:05:26,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 02:05:26,462 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 66 [2020-08-19 02:05:26,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:26,463 INFO L225 Difference]: With dead ends: 76 [2020-08-19 02:05:26,464 INFO L226 Difference]: Without dead ends: 70 [2020-08-19 02:05:26,464 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 [2020-08-19 02:05:26,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-19 02:05:26,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-19 02:05:26,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-19 02:05:26,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-08-19 02:05:26,469 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-08-19 02:05:26,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:26,470 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-08-19 02:05:26,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 02:05:26,470 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-08-19 02:05:26,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-19 02:05:26,471 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:26,472 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:26,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 02:05:26,472 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:26,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:26,473 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2020-08-19 02:05:26,473 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:26,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1158010948] [2020-08-19 02:05:26,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:26,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:27,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:27,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:27,149 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:27,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1158010948] [2020-08-19 02:05:27,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:27,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 02:05:27,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140626917] [2020-08-19 02:05:27,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 02:05:27,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:27,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 02:05:27,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-19 02:05:27,152 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 32 states. [2020-08-19 02:05:27,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:27,329 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-08-19 02:05:27,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 02:05:27,329 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2020-08-19 02:05:27,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:27,330 INFO L225 Difference]: With dead ends: 78 [2020-08-19 02:05:27,331 INFO L226 Difference]: Without dead ends: 72 [2020-08-19 02:05:27,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-19 02:05:27,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-19 02:05:27,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-19 02:05:27,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-19 02:05:27,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-08-19 02:05:27,336 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-08-19 02:05:27,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:27,336 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-08-19 02:05:27,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 02:05:27,336 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-08-19 02:05:27,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-19 02:05:27,337 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:27,337 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:27,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 02:05:27,337 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:27,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:27,338 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2020-08-19 02:05:27,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:27,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665388391] [2020-08-19 02:05:27,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:27,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:27,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:27,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:27,938 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:27,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665388391] [2020-08-19 02:05:27,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:27,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 02:05:27,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173481908] [2020-08-19 02:05:27,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 02:05:27,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:27,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 02:05:27,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 02:05:27,941 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 33 states. [2020-08-19 02:05:28,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:28,121 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-08-19 02:05:28,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 02:05:28,122 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 70 [2020-08-19 02:05:28,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:28,123 INFO L225 Difference]: With dead ends: 80 [2020-08-19 02:05:28,123 INFO L226 Difference]: Without dead ends: 74 [2020-08-19 02:05:28,124 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 02:05:28,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-19 02:05:28,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-19 02:05:28,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-19 02:05:28,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-08-19 02:05:28,128 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-08-19 02:05:28,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:28,128 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-08-19 02:05:28,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 02:05:28,129 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-08-19 02:05:28,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-19 02:05:28,129 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:28,129 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:28,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 02:05:28,130 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:28,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:28,131 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2020-08-19 02:05:28,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:28,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [631842454] [2020-08-19 02:05:28,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:28,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:28,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:28,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:28,699 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:28,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [631842454] [2020-08-19 02:05:28,700 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:28,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 02:05:28,700 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111838166] [2020-08-19 02:05:28,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 02:05:28,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:28,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 02:05:28,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 02:05:28,702 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 34 states. [2020-08-19 02:05:28,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:28,903 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-08-19 02:05:28,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 02:05:28,903 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2020-08-19 02:05:28,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:28,904 INFO L225 Difference]: With dead ends: 82 [2020-08-19 02:05:28,904 INFO L226 Difference]: Without dead ends: 76 [2020-08-19 02:05:28,905 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 02:05:28,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-19 02:05:28,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-19 02:05:28,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-19 02:05:28,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-08-19 02:05:28,909 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-08-19 02:05:28,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:28,909 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-08-19 02:05:28,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 02:05:28,909 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-08-19 02:05:28,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-19 02:05:28,910 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:28,910 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:28,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 02:05:28,910 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:28,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:28,911 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2020-08-19 02:05:28,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:28,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938834060] [2020-08-19 02:05:28,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:28,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:29,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:29,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:29,607 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:29,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938834060] [2020-08-19 02:05:29,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:29,608 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 02:05:29,608 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5812574] [2020-08-19 02:05:29,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 02:05:29,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:29,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 02:05:29,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 02:05:29,610 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 35 states. [2020-08-19 02:05:29,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:29,782 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-08-19 02:05:29,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 02:05:29,782 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-08-19 02:05:29,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:29,783 INFO L225 Difference]: With dead ends: 84 [2020-08-19 02:05:29,783 INFO L226 Difference]: Without dead ends: 78 [2020-08-19 02:05:29,784 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 [2020-08-19 02:05:29,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-19 02:05:29,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-19 02:05:29,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-19 02:05:29,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-08-19 02:05:29,788 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-08-19 02:05:29,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:29,789 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-08-19 02:05:29,791 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 02:05:29,791 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-08-19 02:05:29,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-19 02:05:29,792 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:29,792 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:29,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 02:05:29,792 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:29,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:29,793 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2020-08-19 02:05:29,793 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:29,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2076053484] [2020-08-19 02:05:29,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:29,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:30,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:30,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:30,517 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:30,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2076053484] [2020-08-19 02:05:30,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:30,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 02:05:30,518 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022123306] [2020-08-19 02:05:30,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 02:05:30,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:30,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 02:05:30,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 02:05:30,525 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 36 states. [2020-08-19 02:05:30,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:30,695 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2020-08-19 02:05:30,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 02:05:30,695 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 76 [2020-08-19 02:05:30,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:30,696 INFO L225 Difference]: With dead ends: 86 [2020-08-19 02:05:30,696 INFO L226 Difference]: Without dead ends: 80 [2020-08-19 02:05:30,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 02:05:30,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-19 02:05:30,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-19 02:05:30,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-19 02:05:30,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-08-19 02:05:30,705 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-08-19 02:05:30,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:30,706 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-08-19 02:05:30,706 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 02:05:30,706 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-08-19 02:05:30,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-19 02:05:30,707 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:30,707 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:30,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 02:05:30,707 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:30,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:30,708 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2020-08-19 02:05:30,711 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:30,712 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [903511143] [2020-08-19 02:05:30,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:30,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:31,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:31,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:31,457 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:31,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [903511143] [2020-08-19 02:05:31,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:31,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 02:05:31,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925708304] [2020-08-19 02:05:31,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 02:05:31,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:31,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 02:05:31,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 02:05:31,460 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 37 states. [2020-08-19 02:05:31,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:31,676 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2020-08-19 02:05:31,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 02:05:31,676 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 78 [2020-08-19 02:05:31,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:31,677 INFO L225 Difference]: With dead ends: 88 [2020-08-19 02:05:31,678 INFO L226 Difference]: Without dead ends: 82 [2020-08-19 02:05:31,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 02:05:31,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-19 02:05:31,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-19 02:05:31,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-19 02:05:31,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2020-08-19 02:05:31,682 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2020-08-19 02:05:31,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:31,683 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2020-08-19 02:05:31,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 02:05:31,683 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2020-08-19 02:05:31,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-19 02:05:31,683 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:31,683 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:31,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 02:05:31,684 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:31,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:31,684 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2020-08-19 02:05:31,684 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:31,684 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911295823] [2020-08-19 02:05:31,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:31,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:32,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:32,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:32,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:32,408 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911295823] [2020-08-19 02:05:32,408 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:32,408 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 02:05:32,408 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56341702] [2020-08-19 02:05:32,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 02:05:32,409 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:32,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 02:05:32,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 02:05:32,409 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 38 states. [2020-08-19 02:05:32,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:32,600 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2020-08-19 02:05:32,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 02:05:32,601 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 80 [2020-08-19 02:05:32,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:32,602 INFO L225 Difference]: With dead ends: 90 [2020-08-19 02:05:32,602 INFO L226 Difference]: Without dead ends: 84 [2020-08-19 02:05:32,603 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 02:05:32,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-19 02:05:32,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-19 02:05:32,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-19 02:05:32,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2020-08-19 02:05:32,608 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2020-08-19 02:05:32,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:32,608 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2020-08-19 02:05:32,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 02:05:32,608 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2020-08-19 02:05:32,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-19 02:05:32,609 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:32,609 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:32,609 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 02:05:32,609 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:32,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:32,610 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2020-08-19 02:05:32,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:32,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1725940286] [2020-08-19 02:05:32,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:32,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:33,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:33,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:33,363 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:33,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1725940286] [2020-08-19 02:05:33,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:33,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 02:05:33,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508461443] [2020-08-19 02:05:33,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 02:05:33,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:33,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 02:05:33,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 02:05:33,365 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 39 states. [2020-08-19 02:05:33,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:33,503 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2020-08-19 02:05:33,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 02:05:33,504 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2020-08-19 02:05:33,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:33,505 INFO L225 Difference]: With dead ends: 92 [2020-08-19 02:05:33,505 INFO L226 Difference]: Without dead ends: 86 [2020-08-19 02:05:33,507 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 02:05:33,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-19 02:05:33,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-19 02:05:33,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-19 02:05:33,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2020-08-19 02:05:33,510 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2020-08-19 02:05:33,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:33,511 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2020-08-19 02:05:33,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 02:05:33,511 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2020-08-19 02:05:33,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-19 02:05:33,512 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:33,512 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:33,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 02:05:33,512 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:33,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:33,512 INFO L82 PathProgramCache]: Analyzing trace with hash 1557780453, now seen corresponding path program 36 times [2020-08-19 02:05:33,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:33,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1667995188] [2020-08-19 02:05:33,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:33,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:34,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:34,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:34,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:34,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1667995188] [2020-08-19 02:05:34,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:34,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 02:05:34,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096775626] [2020-08-19 02:05:34,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 02:05:34,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:34,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 02:05:34,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 02:05:34,361 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 40 states. [2020-08-19 02:05:34,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:34,586 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2020-08-19 02:05:34,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 02:05:34,587 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 84 [2020-08-19 02:05:34,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:34,588 INFO L225 Difference]: With dead ends: 94 [2020-08-19 02:05:34,588 INFO L226 Difference]: Without dead ends: 88 [2020-08-19 02:05:34,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 02:05:34,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-19 02:05:34,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-19 02:05:34,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-19 02:05:34,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2020-08-19 02:05:34,592 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2020-08-19 02:05:34,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:34,593 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2020-08-19 02:05:34,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 02:05:34,593 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2020-08-19 02:05:34,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-19 02:05:34,594 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:34,594 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:34,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 02:05:34,594 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:34,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:34,594 INFO L82 PathProgramCache]: Analyzing trace with hash 1537674631, now seen corresponding path program 37 times [2020-08-19 02:05:34,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:34,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [38854493] [2020-08-19 02:05:34,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:34,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:35,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:35,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:35,440 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:35,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [38854493] [2020-08-19 02:05:35,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:35,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 02:05:35,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707126354] [2020-08-19 02:05:35,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 02:05:35,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:35,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 02:05:35,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 02:05:35,442 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 41 states. [2020-08-19 02:05:35,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:35,710 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2020-08-19 02:05:35,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 02:05:35,711 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-08-19 02:05:35,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:35,712 INFO L225 Difference]: With dead ends: 96 [2020-08-19 02:05:35,712 INFO L226 Difference]: Without dead ends: 90 [2020-08-19 02:05:35,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 02:05:35,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-19 02:05:35,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-19 02:05:35,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-19 02:05:35,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2020-08-19 02:05:35,718 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2020-08-19 02:05:35,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:35,719 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2020-08-19 02:05:35,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 02:05:35,719 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2020-08-19 02:05:35,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-19 02:05:35,720 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:35,720 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:35,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 02:05:35,720 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:35,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:35,721 INFO L82 PathProgramCache]: Analyzing trace with hash -604151127, now seen corresponding path program 38 times [2020-08-19 02:05:35,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:35,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1360515307] [2020-08-19 02:05:35,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:35,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:36,618 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:36,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:36,628 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:36,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1360515307] [2020-08-19 02:05:36,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:36,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 02:05:36,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182802746] [2020-08-19 02:05:36,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 02:05:36,629 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:36,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 02:05:36,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 02:05:36,630 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 42 states. [2020-08-19 02:05:36,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:36,893 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2020-08-19 02:05:36,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 02:05:36,893 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 88 [2020-08-19 02:05:36,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:36,895 INFO L225 Difference]: With dead ends: 98 [2020-08-19 02:05:36,895 INFO L226 Difference]: Without dead ends: 92 [2020-08-19 02:05:36,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 02:05:36,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-19 02:05:36,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-19 02:05:36,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-19 02:05:36,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2020-08-19 02:05:36,901 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2020-08-19 02:05:36,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:36,901 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2020-08-19 02:05:36,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 02:05:36,902 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2020-08-19 02:05:36,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-19 02:05:36,903 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:36,903 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:36,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 02:05:36,903 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:36,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:36,904 INFO L82 PathProgramCache]: Analyzing trace with hash -1609369781, now seen corresponding path program 39 times [2020-08-19 02:05:36,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:36,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1119470718] [2020-08-19 02:05:36,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:36,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:37,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:37,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:37,865 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:37,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1119470718] [2020-08-19 02:05:37,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:37,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 02:05:37,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592129872] [2020-08-19 02:05:37,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 02:05:37,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:37,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 02:05:37,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 02:05:37,867 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 43 states. [2020-08-19 02:05:38,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:38,145 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2020-08-19 02:05:38,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 02:05:38,146 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 90 [2020-08-19 02:05:38,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:38,148 INFO L225 Difference]: With dead ends: 100 [2020-08-19 02:05:38,148 INFO L226 Difference]: Without dead ends: 94 [2020-08-19 02:05:38,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 02:05:38,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-19 02:05:38,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-19 02:05:38,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-19 02:05:38,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2020-08-19 02:05:38,154 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2020-08-19 02:05:38,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:38,154 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2020-08-19 02:05:38,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 02:05:38,154 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2020-08-19 02:05:38,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-19 02:05:38,156 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:38,156 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:38,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 02:05:38,156 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:38,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:38,157 INFO L82 PathProgramCache]: Analyzing trace with hash -1256854675, now seen corresponding path program 40 times [2020-08-19 02:05:38,157 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:38,157 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [39533455] [2020-08-19 02:05:38,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:38,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:39,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:39,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:39,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:39,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [39533455] [2020-08-19 02:05:39,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:39,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-19 02:05:39,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185139251] [2020-08-19 02:05:39,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-19 02:05:39,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:39,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-19 02:05:39,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 02:05:39,563 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 44 states. [2020-08-19 02:05:39,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:39,809 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2020-08-19 02:05:39,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-19 02:05:39,809 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 92 [2020-08-19 02:05:39,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:39,811 INFO L225 Difference]: With dead ends: 102 [2020-08-19 02:05:39,811 INFO L226 Difference]: Without dead ends: 96 [2020-08-19 02:05:39,812 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 [2020-08-19 02:05:39,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-19 02:05:39,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-19 02:05:39,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-19 02:05:39,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2020-08-19 02:05:39,818 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2020-08-19 02:05:39,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:39,819 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2020-08-19 02:05:39,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-19 02:05:39,819 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2020-08-19 02:05:39,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-19 02:05:39,820 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:39,820 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:39,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 02:05:39,821 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:39,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:39,822 INFO L82 PathProgramCache]: Analyzing trace with hash -1792254193, now seen corresponding path program 41 times [2020-08-19 02:05:39,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:39,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1993740081] [2020-08-19 02:05:39,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:39,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:40,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:40,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:40,947 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:40,947 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1993740081] [2020-08-19 02:05:40,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:40,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-19 02:05:40,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431521642] [2020-08-19 02:05:40,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-19 02:05:40,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:40,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-19 02:05:40,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 02:05:40,949 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 45 states. [2020-08-19 02:05:41,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:41,189 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2020-08-19 02:05:41,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-19 02:05:41,190 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 94 [2020-08-19 02:05:41,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:41,191 INFO L225 Difference]: With dead ends: 104 [2020-08-19 02:05:41,191 INFO L226 Difference]: Without dead ends: 98 [2020-08-19 02:05:41,193 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 02:05:41,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-19 02:05:41,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-19 02:05:41,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-19 02:05:41,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2020-08-19 02:05:41,197 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2020-08-19 02:05:41,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:41,198 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2020-08-19 02:05:41,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-19 02:05:41,198 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2020-08-19 02:05:41,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-19 02:05:41,199 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:41,199 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:41,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-19 02:05:41,199 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:41,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:41,200 INFO L82 PathProgramCache]: Analyzing trace with hash -915115471, now seen corresponding path program 42 times [2020-08-19 02:05:41,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:41,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1736925490] [2020-08-19 02:05:41,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:41,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:42,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:42,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:42,305 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:42,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1736925490] [2020-08-19 02:05:42,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:42,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-19 02:05:42,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44011532] [2020-08-19 02:05:42,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-19 02:05:42,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:42,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-19 02:05:42,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 02:05:42,307 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 46 states. [2020-08-19 02:05:42,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:42,489 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2020-08-19 02:05:42,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-19 02:05:42,489 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 96 [2020-08-19 02:05:42,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:42,490 INFO L225 Difference]: With dead ends: 106 [2020-08-19 02:05:42,490 INFO L226 Difference]: Without dead ends: 100 [2020-08-19 02:05:42,490 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 02:05:42,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-19 02:05:42,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-19 02:05:42,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-19 02:05:42,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2020-08-19 02:05:42,494 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2020-08-19 02:05:42,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:42,496 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2020-08-19 02:05:42,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-19 02:05:42,496 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2020-08-19 02:05:42,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-19 02:05:42,497 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:42,497 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:42,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-19 02:05:42,497 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:42,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:42,497 INFO L82 PathProgramCache]: Analyzing trace with hash 201606355, now seen corresponding path program 43 times [2020-08-19 02:05:42,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:42,498 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1947094430] [2020-08-19 02:05:42,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:42,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:43,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:43,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:43,645 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:43,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1947094430] [2020-08-19 02:05:43,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:43,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-19 02:05:43,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381407109] [2020-08-19 02:05:43,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-19 02:05:43,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:43,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-19 02:05:43,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 02:05:43,648 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 47 states. [2020-08-19 02:05:43,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:43,933 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2020-08-19 02:05:43,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-19 02:05:43,934 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 98 [2020-08-19 02:05:43,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:43,935 INFO L225 Difference]: With dead ends: 108 [2020-08-19 02:05:43,936 INFO L226 Difference]: Without dead ends: 102 [2020-08-19 02:05:43,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 02:05:43,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-19 02:05:43,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-19 02:05:43,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-19 02:05:43,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2020-08-19 02:05:43,942 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2020-08-19 02:05:43,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:43,943 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2020-08-19 02:05:43,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-19 02:05:43,943 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2020-08-19 02:05:43,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-19 02:05:43,944 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:43,944 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:43,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-19 02:05:43,945 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:43,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:43,945 INFO L82 PathProgramCache]: Analyzing trace with hash -370542859, now seen corresponding path program 44 times [2020-08-19 02:05:43,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:43,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2038852368] [2020-08-19 02:05:43,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:43,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:45,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:45,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:45,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:45,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2038852368] [2020-08-19 02:05:45,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:45,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-19 02:05:45,198 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083013524] [2020-08-19 02:05:45,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-19 02:05:45,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:45,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-19 02:05:45,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 02:05:45,199 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 48 states. [2020-08-19 02:05:45,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:45,427 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2020-08-19 02:05:45,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-19 02:05:45,428 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 100 [2020-08-19 02:05:45,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:45,429 INFO L225 Difference]: With dead ends: 110 [2020-08-19 02:05:45,429 INFO L226 Difference]: Without dead ends: 104 [2020-08-19 02:05:45,429 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 02:05:45,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-19 02:05:45,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-19 02:05:45,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-19 02:05:45,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-08-19 02:05:45,433 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2020-08-19 02:05:45,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:45,433 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-08-19 02:05:45,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-19 02:05:45,434 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-08-19 02:05:45,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-19 02:05:45,434 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:45,434 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:45,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-19 02:05:45,435 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:45,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:45,435 INFO L82 PathProgramCache]: Analyzing trace with hash -450123625, now seen corresponding path program 45 times [2020-08-19 02:05:45,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:45,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1479044442] [2020-08-19 02:05:45,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:45,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:46,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:46,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:46,695 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:46,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1479044442] [2020-08-19 02:05:46,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:46,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-19 02:05:46,696 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656297181] [2020-08-19 02:05:46,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-19 02:05:46,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:46,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-19 02:05:46,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 02:05:46,698 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 49 states. [2020-08-19 02:05:46,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:46,904 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2020-08-19 02:05:46,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-19 02:05:46,904 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 102 [2020-08-19 02:05:46,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:46,906 INFO L225 Difference]: With dead ends: 112 [2020-08-19 02:05:46,906 INFO L226 Difference]: Without dead ends: 106 [2020-08-19 02:05:46,906 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 02:05:46,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-19 02:05:46,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-19 02:05:46,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-19 02:05:46,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-08-19 02:05:46,911 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2020-08-19 02:05:46,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:46,911 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-08-19 02:05:46,911 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-19 02:05:46,912 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-08-19 02:05:46,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-19 02:05:46,912 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:46,912 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:46,913 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-19 02:05:46,913 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:46,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:46,913 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 46 times [2020-08-19 02:05:46,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:46,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1103137962] [2020-08-19 02:05:46,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:46,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:48,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:48,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:48,265 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:48,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1103137962] [2020-08-19 02:05:48,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:48,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-19 02:05:48,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775320141] [2020-08-19 02:05:48,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-19 02:05:48,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:48,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-19 02:05:48,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-19 02:05:48,268 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 50 states. [2020-08-19 02:05:48,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:48,461 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2020-08-19 02:05:48,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-19 02:05:48,462 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2020-08-19 02:05:48,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:48,463 INFO L225 Difference]: With dead ends: 114 [2020-08-19 02:05:48,463 INFO L226 Difference]: Without dead ends: 108 [2020-08-19 02:05:48,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-19 02:05:48,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-19 02:05:48,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-19 02:05:48,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-19 02:05:48,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-08-19 02:05:48,470 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2020-08-19 02:05:48,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:48,470 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-08-19 02:05:48,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-19 02:05:48,471 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-08-19 02:05:48,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-19 02:05:48,471 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:48,471 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:48,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-19 02:05:48,472 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:48,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:48,472 INFO L82 PathProgramCache]: Analyzing trace with hash 1353943643, now seen corresponding path program 47 times [2020-08-19 02:05:48,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:48,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2034762265] [2020-08-19 02:05:48,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:48,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:49,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:49,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:49,837 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:49,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2034762265] [2020-08-19 02:05:49,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:49,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-19 02:05:49,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471633261] [2020-08-19 02:05:49,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-19 02:05:49,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:49,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-19 02:05:49,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-19 02:05:49,839 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 51 states. [2020-08-19 02:05:50,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:50,063 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2020-08-19 02:05:50,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-19 02:05:50,064 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 106 [2020-08-19 02:05:50,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:50,065 INFO L225 Difference]: With dead ends: 116 [2020-08-19 02:05:50,066 INFO L226 Difference]: Without dead ends: 110 [2020-08-19 02:05:50,066 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-19 02:05:50,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-19 02:05:50,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-19 02:05:50,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-19 02:05:50,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2020-08-19 02:05:50,075 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2020-08-19 02:05:50,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:50,075 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2020-08-19 02:05:50,075 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-19 02:05:50,075 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2020-08-19 02:05:50,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-19 02:05:50,076 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:50,076 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:50,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-19 02:05:50,076 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:50,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:50,077 INFO L82 PathProgramCache]: Analyzing trace with hash -1075971459, now seen corresponding path program 48 times [2020-08-19 02:05:50,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:50,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [887481452] [2020-08-19 02:05:50,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:50,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:51,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:51,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:51,468 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:51,468 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [887481452] [2020-08-19 02:05:51,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:51,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-08-19 02:05:51,469 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199267280] [2020-08-19 02:05:51,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-08-19 02:05:51,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:51,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-08-19 02:05:51,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-19 02:05:51,470 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 52 states. [2020-08-19 02:05:51,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:51,687 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2020-08-19 02:05:51,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-08-19 02:05:51,687 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 108 [2020-08-19 02:05:51,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:51,689 INFO L225 Difference]: With dead ends: 118 [2020-08-19 02:05:51,689 INFO L226 Difference]: Without dead ends: 112 [2020-08-19 02:05:51,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-19 02:05:51,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-19 02:05:51,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-19 02:05:51,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-19 02:05:51,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2020-08-19 02:05:51,694 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2020-08-19 02:05:51,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:51,695 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2020-08-19 02:05:51,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-08-19 02:05:51,695 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2020-08-19 02:05:51,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-19 02:05:51,695 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:51,696 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:51,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-19 02:05:51,696 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:51,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:51,696 INFO L82 PathProgramCache]: Analyzing trace with hash 237824543, now seen corresponding path program 49 times [2020-08-19 02:05:51,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:51,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1132050632] [2020-08-19 02:05:51,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:51,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:53,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:53,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:53,180 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:53,181 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1132050632] [2020-08-19 02:05:53,181 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:53,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-19 02:05:53,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778489917] [2020-08-19 02:05:53,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-19 02:05:53,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:53,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-19 02:05:53,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-19 02:05:53,182 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 53 states. [2020-08-19 02:05:53,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:53,433 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2020-08-19 02:05:53,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-08-19 02:05:53,433 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 110 [2020-08-19 02:05:53,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:53,435 INFO L225 Difference]: With dead ends: 120 [2020-08-19 02:05:53,435 INFO L226 Difference]: Without dead ends: 114 [2020-08-19 02:05:53,436 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-19 02:05:53,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-19 02:05:53,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-08-19 02:05:53,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-19 02:05:53,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2020-08-19 02:05:53,440 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2020-08-19 02:05:53,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:53,441 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2020-08-19 02:05:53,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-19 02:05:53,441 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2020-08-19 02:05:53,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-19 02:05:53,442 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:53,442 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:53,442 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-19 02:05:53,442 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:53,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:53,443 INFO L82 PathProgramCache]: Analyzing trace with hash 75397441, now seen corresponding path program 50 times [2020-08-19 02:05:53,444 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:53,444 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [344600619] [2020-08-19 02:05:53,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:53,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:54,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:54,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:54,994 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:54,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [344600619] [2020-08-19 02:05:54,994 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:54,994 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-08-19 02:05:54,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299870975] [2020-08-19 02:05:54,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-08-19 02:05:54,995 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:54,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-08-19 02:05:54,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-19 02:05:54,996 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 54 states. [2020-08-19 02:05:55,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:55,342 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2020-08-19 02:05:55,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-08-19 02:05:55,342 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 112 [2020-08-19 02:05:55,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:55,344 INFO L225 Difference]: With dead ends: 122 [2020-08-19 02:05:55,344 INFO L226 Difference]: Without dead ends: 116 [2020-08-19 02:05:55,345 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-19 02:05:55,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-08-19 02:05:55,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-08-19 02:05:55,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-19 02:05:55,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2020-08-19 02:05:55,349 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2020-08-19 02:05:55,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:55,349 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2020-08-19 02:05:55,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-08-19 02:05:55,350 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2020-08-19 02:05:55,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-19 02:05:55,350 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:55,350 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:55,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-19 02:05:55,351 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:55,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:55,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1398224925, now seen corresponding path program 51 times [2020-08-19 02:05:55,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:55,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [754633390] [2020-08-19 02:05:55,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:55,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:56,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:56,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:56,954 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:56,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [754633390] [2020-08-19 02:05:56,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:56,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-19 02:05:56,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198771867] [2020-08-19 02:05:56,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-19 02:05:56,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:56,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-19 02:05:56,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-19 02:05:56,957 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 55 states. [2020-08-19 02:05:57,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:57,301 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2020-08-19 02:05:57,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-08-19 02:05:57,302 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 114 [2020-08-19 02:05:57,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:57,304 INFO L225 Difference]: With dead ends: 124 [2020-08-19 02:05:57,304 INFO L226 Difference]: Without dead ends: 118 [2020-08-19 02:05:57,305 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-19 02:05:57,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-19 02:05:57,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2020-08-19 02:05:57,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-08-19 02:05:57,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2020-08-19 02:05:57,309 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2020-08-19 02:05:57,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:57,310 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2020-08-19 02:05:57,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-19 02:05:57,310 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2020-08-19 02:05:57,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-19 02:05:57,311 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:57,311 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:57,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-19 02:05:57,311 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:57,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:57,312 INFO L82 PathProgramCache]: Analyzing trace with hash -210110971, now seen corresponding path program 52 times [2020-08-19 02:05:57,312 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:57,312 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1941740809] [2020-08-19 02:05:57,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:57,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:58,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:58,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:58,919 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:58,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1941740809] [2020-08-19 02:05:58,920 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:58,920 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-08-19 02:05:58,920 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240934180] [2020-08-19 02:05:58,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-08-19 02:05:58,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:58,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-08-19 02:05:58,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-19 02:05:58,921 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 56 states. [2020-08-19 02:05:59,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:59,256 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2020-08-19 02:05:59,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-08-19 02:05:59,257 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2020-08-19 02:05:59,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:59,258 INFO L225 Difference]: With dead ends: 126 [2020-08-19 02:05:59,259 INFO L226 Difference]: Without dead ends: 120 [2020-08-19 02:05:59,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-19 02:05:59,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-08-19 02:05:59,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2020-08-19 02:05:59,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-19 02:05:59,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2020-08-19 02:05:59,263 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2020-08-19 02:05:59,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:59,263 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2020-08-19 02:05:59,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-08-19 02:05:59,264 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2020-08-19 02:05:59,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-19 02:05:59,264 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:59,264 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:59,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-19 02:05:59,265 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:59,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:59,265 INFO L82 PathProgramCache]: Analyzing trace with hash -893901913, now seen corresponding path program 53 times [2020-08-19 02:05:59,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:59,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1708402925] [2020-08-19 02:05:59,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:59,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:01,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:06:01,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:01,014 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:06:01,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1708402925] [2020-08-19 02:06:01,014 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:06:01,014 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-19 02:06:01,014 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203707569] [2020-08-19 02:06:01,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-19 02:06:01,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:06:01,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-19 02:06:01,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-19 02:06:01,016 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 57 states. [2020-08-19 02:06:01,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:06:01,308 INFO L93 Difference]: Finished difference Result 128 states and 128 transitions. [2020-08-19 02:06:01,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-08-19 02:06:01,308 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 118 [2020-08-19 02:06:01,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:06:01,309 INFO L225 Difference]: With dead ends: 128 [2020-08-19 02:06:01,310 INFO L226 Difference]: Without dead ends: 122 [2020-08-19 02:06:01,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-19 02:06:01,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-19 02:06:01,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2020-08-19 02:06:01,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-19 02:06:01,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2020-08-19 02:06:01,315 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 118 [2020-08-19 02:06:01,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:06:01,316 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2020-08-19 02:06:01,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-19 02:06:01,316 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2020-08-19 02:06:01,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-19 02:06:01,317 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:06:01,317 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:06:01,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-19 02:06:01,318 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:06:01,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:06:01,318 INFO L82 PathProgramCache]: Analyzing trace with hash -887000887, now seen corresponding path program 54 times [2020-08-19 02:06:01,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:06:01,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [669030166] [2020-08-19 02:06:01,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:06:01,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:03,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:06:03,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:03,116 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:06:03,116 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [669030166] [2020-08-19 02:06:03,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:06:03,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-08-19 02:06:03,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165396755] [2020-08-19 02:06:03,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-08-19 02:06:03,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:06:03,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-08-19 02:06:03,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-19 02:06:03,117 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 58 states. [2020-08-19 02:06:03,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:06:03,482 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2020-08-19 02:06:03,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-08-19 02:06:03,483 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 120 [2020-08-19 02:06:03,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:06:03,484 INFO L225 Difference]: With dead ends: 130 [2020-08-19 02:06:03,484 INFO L226 Difference]: Without dead ends: 124 [2020-08-19 02:06:03,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-19 02:06:03,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-19 02:06:03,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2020-08-19 02:06:03,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-08-19 02:06:03,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-08-19 02:06:03,489 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 120 [2020-08-19 02:06:03,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:06:03,490 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-08-19 02:06:03,490 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-08-19 02:06:03,490 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-08-19 02:06:03,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-19 02:06:03,491 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:06:03,491 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:06:03,491 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-19 02:06:03,491 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:06:03,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:06:03,492 INFO L82 PathProgramCache]: Analyzing trace with hash 1449917803, now seen corresponding path program 55 times [2020-08-19 02:06:03,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:06:03,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1813987982] [2020-08-19 02:06:03,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:06:03,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:05,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:06:05,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:05,405 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:06:05,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1813987982] [2020-08-19 02:06:05,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:06:05,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-08-19 02:06:05,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025820174] [2020-08-19 02:06:05,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-08-19 02:06:05,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:06:05,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-08-19 02:06:05,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-19 02:06:05,407 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 59 states. [2020-08-19 02:06:05,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:06:05,647 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2020-08-19 02:06:05,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-08-19 02:06:05,648 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 122 [2020-08-19 02:06:05,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:06:05,649 INFO L225 Difference]: With dead ends: 132 [2020-08-19 02:06:05,649 INFO L226 Difference]: Without dead ends: 126 [2020-08-19 02:06:05,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-19 02:06:05,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-19 02:06:05,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-08-19 02:06:05,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-19 02:06:05,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2020-08-19 02:06:05,654 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 122 [2020-08-19 02:06:05,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:06:05,655 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2020-08-19 02:06:05,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-08-19 02:06:05,655 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2020-08-19 02:06:05,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-19 02:06:05,656 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:06:05,656 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:06:05,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-19 02:06:05,656 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:06:05,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:06:05,657 INFO L82 PathProgramCache]: Analyzing trace with hash 960883085, now seen corresponding path program 56 times [2020-08-19 02:06:05,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:06:05,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2100504168] [2020-08-19 02:06:05,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:06:05,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:07,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:06:07,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:07,578 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:06:07,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2100504168] [2020-08-19 02:06:07,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:06:07,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-08-19 02:06:07,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754078906] [2020-08-19 02:06:07,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-08-19 02:06:07,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:06:07,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-08-19 02:06:07,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-19 02:06:07,580 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 60 states. [2020-08-19 02:06:07,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:06:07,961 INFO L93 Difference]: Finished difference Result 134 states and 134 transitions. [2020-08-19 02:06:07,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-08-19 02:06:07,962 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 124 [2020-08-19 02:06:07,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:06:07,963 INFO L225 Difference]: With dead ends: 134 [2020-08-19 02:06:07,963 INFO L226 Difference]: Without dead ends: 128 [2020-08-19 02:06:07,964 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-19 02:06:07,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-08-19 02:06:07,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2020-08-19 02:06:07,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-19 02:06:07,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2020-08-19 02:06:07,968 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 124 [2020-08-19 02:06:07,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:06:07,968 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2020-08-19 02:06:07,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-08-19 02:06:07,968 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2020-08-19 02:06:07,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-19 02:06:07,969 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:06:07,969 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:06:07,969 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-19 02:06:07,969 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:06:07,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:06:07,969 INFO L82 PathProgramCache]: Analyzing trace with hash -850045649, now seen corresponding path program 57 times [2020-08-19 02:06:07,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:06:07,970 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2021738337] [2020-08-19 02:06:07,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:06:07,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:09,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:06:09,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:09,943 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:06:09,944 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2021738337] [2020-08-19 02:06:09,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:06:09,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-08-19 02:06:09,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271811520] [2020-08-19 02:06:09,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-08-19 02:06:09,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:06:09,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-08-19 02:06:09,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-19 02:06:09,945 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 61 states. [2020-08-19 02:06:10,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:06:10,209 INFO L93 Difference]: Finished difference Result 136 states and 136 transitions. [2020-08-19 02:06:10,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-08-19 02:06:10,210 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 126 [2020-08-19 02:06:10,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:06:10,211 INFO L225 Difference]: With dead ends: 136 [2020-08-19 02:06:10,211 INFO L226 Difference]: Without dead ends: 130 [2020-08-19 02:06:10,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-19 02:06:10,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-19 02:06:10,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2020-08-19 02:06:10,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-08-19 02:06:10,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2020-08-19 02:06:10,216 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 126 [2020-08-19 02:06:10,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:06:10,216 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2020-08-19 02:06:10,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-08-19 02:06:10,216 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2020-08-19 02:06:10,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-08-19 02:06:10,217 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:06:10,217 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:06:10,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-19 02:06:10,217 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:06:10,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:06:10,217 INFO L82 PathProgramCache]: Analyzing trace with hash -1690804143, now seen corresponding path program 58 times [2020-08-19 02:06:10,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:06:10,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [613548704] [2020-08-19 02:06:10,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:06:10,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat