/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 19:53:25,962 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 19:53:25,964 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 19:53:25,989 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 19:53:25,989 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 19:53:25,990 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 19:53:25,992 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 19:53:25,994 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 19:53:25,995 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 19:53:25,996 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 19:53:25,997 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 19:53:25,999 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 19:53:25,999 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 19:53:26,000 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 19:53:26,002 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 19:53:26,004 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 19:53:26,005 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 19:53:26,006 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 19:53:26,008 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 19:53:26,010 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 19:53:26,011 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 19:53:26,013 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 19:53:26,014 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 19:53:26,015 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 19:53:26,017 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 19:53:26,025 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 19:53:26,026 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 19:53:26,027 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 19:53:26,028 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 19:53:26,051 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 19:53:26,051 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 19:53:26,053 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 19:53:26,053 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 19:53:26,053 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 19:53:26,053 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 19:53:26,053 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 19:53:26,054 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 19:53:26,054 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 19:53:26,054 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 19:53:26,054 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 19:53:26,054 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 19:53:26,055 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 19:53:26,055 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 19:53:26,055 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 19:53:26,055 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 19:53:26,055 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 19:53:26,056 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 19:53:26,056 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 19:53:26,056 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 19:53:26,056 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 19:53:26,056 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:53:26,057 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 19:53:26,057 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 19:53:26,057 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 19:53:26,057 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 19:53:26,057 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 19:53:26,058 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 19:53:26,058 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 19:53:26,058 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=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; [2020-08-21 19:53:26,390 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 19:53:26,403 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 19:53:26,406 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 19:53:26,408 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 19:53:26,408 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 19:53:26,409 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-21 19:53:26,495 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9468a3fca/bf8e206e2b58490382ceda3bd6f7fa1b/FLAG46a143c1b [2020-08-21 19:53:26,973 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 19:53:26,974 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-21 19:53:26,978 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9468a3fca/bf8e206e2b58490382ceda3bd6f7fa1b/FLAG46a143c1b [2020-08-21 19:53:27,407 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9468a3fca/bf8e206e2b58490382ceda3bd6f7fa1b [2020-08-21 19:53:27,418 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 19:53:27,421 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 19:53:27,424 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 19:53:27,424 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 19:53:27,428 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 19:53:27,429 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:53:27" (1/1) ... [2020-08-21 19:53:27,432 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33164480 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:27, skipping insertion in model container [2020-08-21 19:53:27,433 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:53:27" (1/1) ... [2020-08-21 19:53:27,443 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 19:53:27,463 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 19:53:27,651 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:53:27,661 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 19:53:27,684 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:53:27,704 INFO L208 MainTranslator]: Completed translation [2020-08-21 19:53:27,705 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:27 WrapperNode [2020-08-21 19:53:27,705 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 19:53:27,706 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 19:53:27,707 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 19:53:27,707 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 19:53:27,721 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:27" (1/1) ... [2020-08-21 19:53:27,723 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:27" (1/1) ... [2020-08-21 19:53:27,808 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:27" (1/1) ... [2020-08-21 19:53:27,808 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:27" (1/1) ... [2020-08-21 19:53:27,815 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:27" (1/1) ... [2020-08-21 19:53:27,825 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:27" (1/1) ... [2020-08-21 19:53:27,826 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:27" (1/1) ... [2020-08-21 19:53:27,828 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 19:53:27,828 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 19:53:27,829 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 19:53:27,829 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 19:53:27,830 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:27" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:53:27,891 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 19:53:27,892 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 19:53:27,892 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 19:53:27,893 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 19:53:27,893 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 19:53:27,893 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 19:53:27,893 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 19:53:27,893 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 19:53:27,893 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 19:53:27,894 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 19:53:27,894 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 19:53:27,894 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 19:53:27,894 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 19:53:28,084 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 19:53:28,084 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 19:53:28,088 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:53:28 BoogieIcfgContainer [2020-08-21 19:53:28,088 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 19:53:28,090 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 19:53:28,090 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 19:53:28,093 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 19:53:28,093 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:53:27" (1/3) ... [2020-08-21 19:53:28,094 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30bf458f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:53:28, skipping insertion in model container [2020-08-21 19:53:28,094 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:27" (2/3) ... [2020-08-21 19:53:28,095 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30bf458f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:53:28, skipping insertion in model container [2020-08-21 19:53:28,095 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:53:28" (3/3) ... [2020-08-21 19:53:28,096 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-21 19:53:28,107 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 19:53:28,114 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 19:53:28,128 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 19:53:28,152 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 19:53:28,153 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 19:53:28,153 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 19:53:28,153 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 19:53:28,153 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 19:53:28,153 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 19:53:28,154 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 19:53:28,154 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 19:53:28,170 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-21 19:53:28,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 19:53:28,176 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:28,177 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:28,177 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:28,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:28,184 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-21 19:53:28,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:28,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [265283859] [2020-08-21 19:53:28,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:28,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:28,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:28,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:28,301 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:28,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [265283859] [2020-08-21 19:53:28,304 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:53:28,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 19:53:28,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571315699] [2020-08-21 19:53:28,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 19:53:28,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:28,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 19:53:28,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 19:53:28,328 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-21 19:53:28,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:28,352 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-21 19:53:28,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 19:53:28,354 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-21 19:53:28,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:28,361 INFO L225 Difference]: With dead ends: 37 [2020-08-21 19:53:28,361 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 19:53:28,364 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 19:53:28,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 19:53:28,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 19:53:28,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 19:53:28,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-21 19:53:28,397 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-21 19:53:28,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:28,397 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-21 19:53:28,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 19:53:28,398 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-21 19:53:28,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 19:53:28,398 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:28,398 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:28,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 19:53:28,399 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:28,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:28,400 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-21 19:53:28,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:28,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1438539440] [2020-08-21 19:53:28,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:28,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:28,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:28,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:28,456 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:28,456 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1438539440] [2020-08-21 19:53:28,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:53:28,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 19:53:28,457 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648817808] [2020-08-21 19:53:28,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 19:53:28,460 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:28,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 19:53:28,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:53:28,461 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-21 19:53:28,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:28,480 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-21 19:53:28,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 19:53:28,481 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 19:53:28,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:28,482 INFO L225 Difference]: With dead ends: 20 [2020-08-21 19:53:28,483 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 19:53:28,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:53:28,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 19:53:28,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 19:53:28,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 19:53:28,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 19:53:28,506 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-21 19:53:28,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:28,510 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 19:53:28,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 19:53:28,511 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 19:53:28,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 19:53:28,512 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:28,512 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:28,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 19:53:28,516 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:28,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:28,517 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-21 19:53:28,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:28,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [173918924] [2020-08-21 19:53:28,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:28,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:28,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:28,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:28,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:28,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [173918924] [2020-08-21 19:53:28,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:53:28,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 19:53:28,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870443629] [2020-08-21 19:53:28,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 19:53:28,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:28,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 19:53:28,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:53:28,607 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-21 19:53:28,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:28,619 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-21 19:53:28,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 19:53:28,619 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-21 19:53:28,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:28,620 INFO L225 Difference]: With dead ends: 25 [2020-08-21 19:53:28,620 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 19:53:28,621 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:53:28,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 19:53:28,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 19:53:28,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 19:53:28,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 19:53:28,627 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-21 19:53:28,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:28,627 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 19:53:28,627 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 19:53:28,628 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 19:53:28,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 19:53:28,628 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:28,628 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:28,629 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 19:53:28,629 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:28,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:28,630 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-21 19:53:28,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:28,630 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807651789] [2020-08-21 19:53:28,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:28,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:28,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:28,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:28,695 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:28,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [807651789] [2020-08-21 19:53:28,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:28,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 19:53:28,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610527559] [2020-08-21 19:53:28,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:53:28,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:28,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:53:28,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:53:28,699 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-21 19:53:28,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:28,765 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-21 19:53:28,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:53:28,766 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-21 19:53:28,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:28,767 INFO L225 Difference]: With dead ends: 26 [2020-08-21 19:53:28,767 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 19:53:28,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:53:28,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 19:53:28,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 19:53:28,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 19:53:28,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-21 19:53:28,774 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-21 19:53:28,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:28,775 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-21 19:53:28,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:53:28,775 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-21 19:53:28,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 19:53:28,776 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:28,776 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:28,777 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 19:53:28,777 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:28,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:28,778 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-21 19:53:28,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:28,778 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839981457] [2020-08-21 19:53:28,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:28,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:28,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:28,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:28,863 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:28,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839981457] [2020-08-21 19:53:28,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:28,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 19:53:28,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526440501] [2020-08-21 19:53:28,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:53:28,865 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:28,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:53:28,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:53:28,866 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-21 19:53:28,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:28,956 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-21 19:53:28,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 19:53:28,957 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-21 19:53:28,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:28,958 INFO L225 Difference]: With dead ends: 27 [2020-08-21 19:53:28,958 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 19:53:28,959 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:53:28,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 19:53:28,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 19:53:28,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 19:53:28,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-21 19:53:28,966 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-21 19:53:28,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:28,966 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-21 19:53:28,966 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:53:28,966 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-21 19:53:28,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 19:53:28,967 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:28,967 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:28,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 19:53:28,968 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:28,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:28,968 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-21 19:53:28,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:28,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [318820693] [2020-08-21 19:53:28,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:28,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:29,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:29,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:29,085 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:29,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [318820693] [2020-08-21 19:53:29,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:29,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 19:53:29,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750759437] [2020-08-21 19:53:29,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 19:53:29,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:29,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 19:53:29,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:53:29,089 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-21 19:53:29,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:29,193 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-21 19:53:29,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:53:29,194 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-21 19:53:29,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:29,195 INFO L225 Difference]: With dead ends: 28 [2020-08-21 19:53:29,195 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 19:53:29,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:53:29,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 19:53:29,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 19:53:29,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 19:53:29,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-21 19:53:29,202 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-21 19:53:29,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:29,203 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-21 19:53:29,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 19:53:29,203 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-21 19:53:29,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 19:53:29,204 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:29,205 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:29,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 19:53:29,205 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:29,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:29,206 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-21 19:53:29,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:29,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [914009436] [2020-08-21 19:53:29,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:29,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:29,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:29,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:29,339 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:29,340 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [914009436] [2020-08-21 19:53:29,340 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:29,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 19:53:29,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450969663] [2020-08-21 19:53:29,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 19:53:29,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:29,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 19:53:29,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:53:29,342 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-21 19:53:29,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:29,488 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 19:53:29,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 19:53:29,489 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-21 19:53:29,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:29,489 INFO L225 Difference]: With dead ends: 29 [2020-08-21 19:53:29,490 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 19:53:29,490 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:53:29,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 19:53:29,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 19:53:29,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 19:53:29,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-21 19:53:29,496 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-21 19:53:29,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:29,497 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-21 19:53:29,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 19:53:29,497 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-21 19:53:29,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 19:53:29,498 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:29,498 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:29,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 19:53:29,499 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:29,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:29,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-21 19:53:29,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:29,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1584766265] [2020-08-21 19:53:29,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:29,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:29,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:29,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:29,613 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:29,617 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1584766265] [2020-08-21 19:53:29,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:29,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 19:53:29,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180447048] [2020-08-21 19:53:29,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 19:53:29,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:29,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 19:53:29,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:53:29,619 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-21 19:53:29,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:29,812 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-21 19:53:29,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 19:53:29,813 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-21 19:53:29,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:29,814 INFO L225 Difference]: With dead ends: 30 [2020-08-21 19:53:29,814 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 19:53:29,816 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:53:29,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 19:53:29,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 19:53:29,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 19:53:29,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-21 19:53:29,826 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-21 19:53:29,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:29,829 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-21 19:53:29,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 19:53:29,830 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-21 19:53:29,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 19:53:29,831 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:29,831 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:29,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 19:53:29,832 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:29,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:29,832 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-21 19:53:29,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:29,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [882200598] [2020-08-21 19:53:29,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:29,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:29,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:29,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:29,905 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:29,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [882200598] [2020-08-21 19:53:29,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:29,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 19:53:29,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837543776] [2020-08-21 19:53:29,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:53:29,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:29,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:53:29,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:53:29,911 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-21 19:53:29,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:29,928 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-21 19:53:29,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:53:29,929 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 19:53:29,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:29,930 INFO L225 Difference]: With dead ends: 30 [2020-08-21 19:53:29,930 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 19:53:29,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:53:29,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 19:53:29,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 19:53:29,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 19:53:29,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-21 19:53:29,943 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-21 19:53:29,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:29,943 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-21 19:53:29,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 19:53:29,945 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-21 19:53:29,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 19:53:29,946 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:29,951 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:29,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 19:53:29,952 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:29,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:29,952 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-21 19:53:29,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:29,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1422539735] [2020-08-21 19:53:29,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:29,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:30,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,008 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:30,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1422539735] [2020-08-21 19:53:30,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:30,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 19:53:30,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52305831] [2020-08-21 19:53:30,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:53:30,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:30,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:53:30,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:53:30,011 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-21 19:53:30,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:30,029 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-21 19:53:30,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:53:30,030 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-21 19:53:30,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:30,031 INFO L225 Difference]: With dead ends: 34 [2020-08-21 19:53:30,031 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 19:53:30,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:53:30,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 19:53:30,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 19:53:30,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 19:53:30,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-21 19:53:30,038 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-21 19:53:30,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:30,038 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-21 19:53:30,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:53:30,038 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-21 19:53:30,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 19:53:30,039 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:30,039 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:30,040 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 19:53:30,040 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:30,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:30,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-21 19:53:30,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:30,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [52207177] [2020-08-21 19:53:30,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:30,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:30,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,088 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:30,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [52207177] [2020-08-21 19:53:30,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:30,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 19:53:30,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675440114] [2020-08-21 19:53:30,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:53:30,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:30,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:53:30,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:53:30,091 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-21 19:53:30,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:30,115 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-21 19:53:30,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 19:53:30,116 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-21 19:53:30,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:30,117 INFO L225 Difference]: With dead ends: 38 [2020-08-21 19:53:30,117 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 19:53:30,117 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:53:30,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 19:53:30,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 19:53:30,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 19:53:30,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-21 19:53:30,124 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-21 19:53:30,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:30,124 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-21 19:53:30,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:53:30,124 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-21 19:53:30,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 19:53:30,125 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:30,125 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:30,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 19:53:30,126 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:30,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:30,126 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-21 19:53:30,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:30,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1463896648] [2020-08-21 19:53:30,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:30,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:30,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,212 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:30,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1463896648] [2020-08-21 19:53:30,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:30,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 19:53:30,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623278233] [2020-08-21 19:53:30,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 19:53:30,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:30,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 19:53:30,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:53:30,215 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-21 19:53:30,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:30,407 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-21 19:53:30,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 19:53:30,407 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-21 19:53:30,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:30,409 INFO L225 Difference]: With dead ends: 54 [2020-08-21 19:53:30,409 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 19:53:30,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:53:30,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 19:53:30,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 19:53:30,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 19:53:30,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-21 19:53:30,417 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-21 19:53:30,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:30,417 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-21 19:53:30,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 19:53:30,418 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-21 19:53:30,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 19:53:30,419 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:30,419 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:30,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 19:53:30,419 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:30,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:30,420 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-21 19:53:30,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:30,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [687599574] [2020-08-21 19:53:30,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:30,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:30,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,529 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:30,530 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [687599574] [2020-08-21 19:53:30,530 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:30,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 19:53:30,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244789538] [2020-08-21 19:53:30,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 19:53:30,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:30,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 19:53:30,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:53:30,532 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-21 19:53:30,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:30,735 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-21 19:53:30,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 19:53:30,736 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-21 19:53:30,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:30,737 INFO L225 Difference]: With dead ends: 55 [2020-08-21 19:53:30,737 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 19:53:30,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:53:30,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 19:53:30,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 19:53:30,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 19:53:30,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-21 19:53:30,744 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-21 19:53:30,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:30,745 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-21 19:53:30,745 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 19:53:30,745 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-21 19:53:30,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 19:53:30,746 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:30,746 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:30,746 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 19:53:30,746 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:30,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:30,747 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-21 19:53:30,747 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:30,747 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1205041796] [2020-08-21 19:53:30,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:30,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:30,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:30,886 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:30,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1205041796] [2020-08-21 19:53:30,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:30,887 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 19:53:30,887 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270484434] [2020-08-21 19:53:30,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 19:53:30,888 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:30,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 19:53:30,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:53:30,889 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-21 19:53:31,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:31,128 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-21 19:53:31,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 19:53:31,128 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 19:53:31,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:31,129 INFO L225 Difference]: With dead ends: 56 [2020-08-21 19:53:31,129 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 19:53:31,130 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:53:31,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 19:53:31,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 19:53:31,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 19:53:31,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-21 19:53:31,141 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-21 19:53:31,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:31,141 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-21 19:53:31,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 19:53:31,142 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-21 19:53:31,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 19:53:31,143 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:31,143 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:31,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 19:53:31,144 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:31,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:31,144 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-21 19:53:31,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:31,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1291770990] [2020-08-21 19:53:31,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:31,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:31,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:31,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:31,305 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:31,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1291770990] [2020-08-21 19:53:31,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:31,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 19:53:31,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783862254] [2020-08-21 19:53:31,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 19:53:31,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:31,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 19:53:31,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:53:31,307 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-21 19:53:31,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:31,604 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-21 19:53:31,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 19:53:31,604 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-21 19:53:31,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:31,605 INFO L225 Difference]: With dead ends: 57 [2020-08-21 19:53:31,605 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 19:53:31,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:53:31,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 19:53:31,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 19:53:31,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 19:53:31,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-21 19:53:31,612 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-21 19:53:31,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:31,612 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-21 19:53:31,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 19:53:31,613 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-21 19:53:31,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 19:53:31,613 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:31,613 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:31,614 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 19:53:31,614 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:31,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:31,614 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-21 19:53:31,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:31,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1078492352] [2020-08-21 19:53:31,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:31,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:31,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:31,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:31,736 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:31,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1078492352] [2020-08-21 19:53:31,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:31,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 19:53:31,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143729145] [2020-08-21 19:53:31,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 19:53:31,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:31,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 19:53:31,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-21 19:53:31,738 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-21 19:53:32,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:32,109 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-21 19:53:32,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 19:53:32,109 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 19:53:32,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:32,110 INFO L225 Difference]: With dead ends: 58 [2020-08-21 19:53:32,110 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 19:53:32,111 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-08-21 19:53:32,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 19:53:32,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 19:53:32,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 19:53:32,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-21 19:53:32,118 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-21 19:53:32,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:32,118 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-21 19:53:32,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 19:53:32,118 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-21 19:53:32,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 19:53:32,119 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:32,119 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:32,119 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 19:53:32,120 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:32,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:32,120 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-21 19:53:32,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:32,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1321563994] [2020-08-21 19:53:32,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:32,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:32,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:32,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:32,268 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:32,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1321563994] [2020-08-21 19:53:32,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:32,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 19:53:32,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871048392] [2020-08-21 19:53:32,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 19:53:32,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:32,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 19:53:32,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:53:32,270 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-21 19:53:32,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:32,657 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-21 19:53:32,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 19:53:32,658 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-21 19:53:32,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:32,659 INFO L225 Difference]: With dead ends: 59 [2020-08-21 19:53:32,659 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 19:53:32,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-21 19:53:32,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 19:53:32,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 19:53:32,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 19:53:32,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-21 19:53:32,668 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-21 19:53:32,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:32,668 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-21 19:53:32,668 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 19:53:32,668 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-21 19:53:32,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 19:53:32,669 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:32,669 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:32,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 19:53:32,670 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:32,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:32,670 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-21 19:53:32,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:32,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688290679] [2020-08-21 19:53:32,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:32,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:32,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:32,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:32,847 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:32,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688290679] [2020-08-21 19:53:32,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:32,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 19:53:32,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280204882] [2020-08-21 19:53:32,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 19:53:32,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:32,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 19:53:32,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:53:32,850 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-21 19:53:33,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:33,321 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-21 19:53:33,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 19:53:33,321 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-21 19:53:33,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:33,322 INFO L225 Difference]: With dead ends: 60 [2020-08-21 19:53:33,322 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 19:53:33,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-21 19:53:33,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 19:53:33,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 19:53:33,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 19:53:33,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-21 19:53:33,330 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-21 19:53:33,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:33,330 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-21 19:53:33,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 19:53:33,330 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-21 19:53:33,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 19:53:33,331 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:33,331 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:33,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 19:53:33,332 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:33,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:33,332 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-21 19:53:33,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:33,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1382855802] [2020-08-21 19:53:33,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:33,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:33,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:33,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:33,509 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:33,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1382855802] [2020-08-21 19:53:33,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:33,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 19:53:33,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426705772] [2020-08-21 19:53:33,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 19:53:33,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:33,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 19:53:33,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:53:33,512 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-21 19:53:34,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:34,035 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-21 19:53:34,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 19:53:34,035 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-21 19:53:34,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:34,036 INFO L225 Difference]: With dead ends: 61 [2020-08-21 19:53:34,036 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 19:53:34,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-21 19:53:34,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 19:53:34,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 19:53:34,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 19:53:34,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-21 19:53:34,044 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-21 19:53:34,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:34,045 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-21 19:53:34,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 19:53:34,045 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-21 19:53:34,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 19:53:34,046 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:34,046 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:34,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 19:53:34,046 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:34,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:34,047 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-21 19:53:34,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:34,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1045250440] [2020-08-21 19:53:34,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:34,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:34,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:34,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:34,270 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:34,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1045250440] [2020-08-21 19:53:34,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:34,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 19:53:34,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829779078] [2020-08-21 19:53:34,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 19:53:34,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:34,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 19:53:34,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-21 19:53:34,272 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-21 19:53:34,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:34,847 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-21 19:53:34,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 19:53:34,847 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-21 19:53:34,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:34,849 INFO L225 Difference]: With dead ends: 62 [2020-08-21 19:53:34,849 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 19:53:34,850 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 19:53:34,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 19:53:34,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 19:53:34,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 19:53:34,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-21 19:53:34,861 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-21 19:53:34,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:34,862 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-21 19:53:34,862 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 19:53:34,862 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-21 19:53:34,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 19:53:34,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:34,863 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:34,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 19:53:34,863 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:34,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:34,863 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-21 19:53:34,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:34,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2060159535] [2020-08-21 19:53:34,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:34,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:35,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:35,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:35,104 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:35,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2060159535] [2020-08-21 19:53:35,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:35,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 19:53:35,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296595144] [2020-08-21 19:53:35,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 19:53:35,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:35,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 19:53:35,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:53:35,106 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-21 19:53:35,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:35,781 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-21 19:53:35,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 19:53:35,782 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-21 19:53:35,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:35,783 INFO L225 Difference]: With dead ends: 63 [2020-08-21 19:53:35,783 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 19:53:35,784 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 19:53:35,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 19:53:35,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 19:53:35,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 19:53:35,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-21 19:53:35,790 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-21 19:53:35,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:35,790 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-21 19:53:35,790 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 19:53:35,790 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-21 19:53:35,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 19:53:35,791 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:35,791 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:35,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 19:53:35,791 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:35,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:35,791 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-21 19:53:35,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:35,792 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2117261024] [2020-08-21 19:53:35,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:35,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:36,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:36,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:36,040 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:36,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2117261024] [2020-08-21 19:53:36,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:36,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 19:53:36,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214746343] [2020-08-21 19:53:36,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 19:53:36,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:36,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 19:53:36,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-21 19:53:36,043 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-21 19:53:36,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:36,747 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-21 19:53:36,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 19:53:36,749 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-21 19:53:36,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:36,750 INFO L225 Difference]: With dead ends: 64 [2020-08-21 19:53:36,750 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 19:53:36,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 19:53:36,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 19:53:36,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 19:53:36,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 19:53:36,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-21 19:53:36,759 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-21 19:53:36,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:36,759 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-21 19:53:36,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 19:53:36,759 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-21 19:53:36,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 19:53:36,760 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:36,760 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:36,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 19:53:36,761 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:36,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:36,761 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-21 19:53:36,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:36,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424923475] [2020-08-21 19:53:36,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:36,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:37,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:37,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:37,053 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:37,054 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424923475] [2020-08-21 19:53:37,054 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:37,054 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 19:53:37,054 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531176016] [2020-08-21 19:53:37,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 19:53:37,055 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:37,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 19:53:37,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:53:37,056 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-21 19:53:37,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:37,832 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-21 19:53:37,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 19:53:37,833 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-21 19:53:37,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:37,834 INFO L225 Difference]: With dead ends: 65 [2020-08-21 19:53:37,834 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 19:53:37,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 19:53:37,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 19:53:37,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 19:53:37,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 19:53:37,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-21 19:53:37,841 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-21 19:53:37,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:37,842 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-21 19:53:37,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 19:53:37,842 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-21 19:53:37,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 19:53:37,843 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:37,843 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:37,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 19:53:37,843 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:37,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:37,843 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-21 19:53:37,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:37,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [988149373] [2020-08-21 19:53:37,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:37,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:38,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:38,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:38,179 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:38,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [988149373] [2020-08-21 19:53:38,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:38,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 19:53:38,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806610257] [2020-08-21 19:53:38,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 19:53:38,180 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:38,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 19:53:38,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-21 19:53:38,181 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-21 19:53:39,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:39,035 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-21 19:53:39,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 19:53:39,036 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-21 19:53:39,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:39,037 INFO L225 Difference]: With dead ends: 66 [2020-08-21 19:53:39,037 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 19:53:39,038 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 19:53:39,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 19:53:39,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 19:53:39,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 19:53:39,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-21 19:53:39,046 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-21 19:53:39,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:39,046 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-21 19:53:39,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 19:53:39,046 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-21 19:53:39,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 19:53:39,047 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:39,047 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:39,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 19:53:39,050 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:39,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:39,051 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-21 19:53:39,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:39,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1076086775] [2020-08-21 19:53:39,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:39,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:39,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:39,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:39,398 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:39,399 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1076086775] [2020-08-21 19:53:39,399 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:39,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 19:53:39,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641717512] [2020-08-21 19:53:39,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 19:53:39,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:39,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 19:53:39,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:53:39,400 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-21 19:53:40,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:40,353 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-21 19:53:40,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 19:53:40,353 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-21 19:53:40,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:40,354 INFO L225 Difference]: With dead ends: 67 [2020-08-21 19:53:40,354 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 19:53:40,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 19:53:40,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 19:53:40,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 19:53:40,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 19:53:40,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-21 19:53:40,362 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-21 19:53:40,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:40,362 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-21 19:53:40,362 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 19:53:40,362 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-21 19:53:40,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 19:53:40,363 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:40,363 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:40,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 19:53:40,363 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:40,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:40,364 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-21 19:53:40,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:40,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1534503460] [2020-08-21 19:53:40,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:40,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:40,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:40,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:40,698 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:40,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1534503460] [2020-08-21 19:53:40,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:40,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 19:53:40,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143707417] [2020-08-21 19:53:40,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 19:53:40,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:40,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 19:53:40,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-21 19:53:40,700 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-21 19:53:41,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:41,787 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-21 19:53:41,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 19:53:41,789 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-21 19:53:41,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:41,790 INFO L225 Difference]: With dead ends: 68 [2020-08-21 19:53:41,790 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 19:53:41,791 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 19:53:41,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 19:53:41,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 19:53:41,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 19:53:41,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-21 19:53:41,798 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-21 19:53:41,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:41,799 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-21 19:53:41,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 19:53:41,799 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-21 19:53:41,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 19:53:41,799 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:41,799 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:41,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 19:53:41,800 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:41,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:41,800 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-21 19:53:41,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:41,801 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [14643191] [2020-08-21 19:53:41,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:41,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:42,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:42,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:42,165 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:53:42,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [14643191] [2020-08-21 19:53:42,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:42,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 19:53:42,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776132548] [2020-08-21 19:53:42,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 19:53:42,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:42,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 19:53:42,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-21 19:53:42,173 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-21 19:53:43,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:43,337 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-21 19:53:43,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 19:53:43,338 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-21 19:53:43,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:43,338 INFO L225 Difference]: With dead ends: 69 [2020-08-21 19:53:43,339 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 19:53:43,340 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 19:53:43,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 19:53:43,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 19:53:43,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 19:53:43,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-21 19:53:43,349 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-21 19:53:43,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:43,349 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-21 19:53:43,350 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 19:53:43,350 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-21 19:53:43,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 19:53:43,350 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:43,350 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:43,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 19:53:43,350 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:43,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:43,351 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-21 19:53:43,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:43,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [73192564] [2020-08-21 19:53:43,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:43,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:43,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:43,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:43,399 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-21 19:53:43,399 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [73192564] [2020-08-21 19:53:43,399 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:53:43,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 19:53:43,400 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523842814] [2020-08-21 19:53:43,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:53:43,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:43,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:53:43,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:53:43,400 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-21 19:53:43,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:43,428 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-21 19:53:43,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:53:43,428 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-21 19:53:43,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:43,429 INFO L225 Difference]: With dead ends: 66 [2020-08-21 19:53:43,429 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 19:53:43,429 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:53:43,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 19:53:43,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 19:53:43,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 19:53:43,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 19:53:43,430 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-21 19:53:43,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:43,430 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 19:53:43,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:53:43,430 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 19:53:43,431 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 19:53:43,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 19:53:43,433 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 19:53:43,622 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-21 19:53:43,622 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-21 19:53:43,622 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-21 19:53:43,622 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-21 19:53:43,622 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-21 19:53:43,622 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-21 19:53:43,622 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-21 19:53:43,623 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-21 19:53:43,623 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-21 19:53:43,623 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-21 19:53:43,623 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-21 19:53:43,623 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-21 19:53:43,623 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-21 19:53:43,623 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-21 19:53:43,623 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-21 19:53:43,624 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (= main_~k~0 4) (and (<= main_~i~0 0) (<= (+ main_~j~0 100) 0))) [2020-08-21 19:53:43,624 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-21 19:53:43,624 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-21 19:53:43,624 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-21 19:53:43,624 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-21 19:53:43,624 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-21 19:53:43,624 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-21 19:53:43,624 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-21 19:53:43,624 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-21 19:53:43,624 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-21 19:53:43,643 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 07:53:43 BoogieIcfgContainer [2020-08-21 19:53:43,643 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 19:53:43,645 INFO L168 Benchmark]: Toolchain (without parser) took 16224.78 ms. Allocated memory was 138.9 MB in the beginning and 374.9 MB in the end (delta: 235.9 MB). Free memory was 102.5 MB in the beginning and 125.5 MB in the end (delta: -23.0 MB). Peak memory consumption was 212.9 MB. Max. memory is 7.1 GB. [2020-08-21 19:53:43,646 INFO L168 Benchmark]: CDTParser took 0.31 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 19:53:43,646 INFO L168 Benchmark]: CACSL2BoogieTranslator took 281.81 ms. Allocated memory is still 138.9 MB. Free memory was 102.3 MB in the beginning and 92.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-08-21 19:53:43,647 INFO L168 Benchmark]: Boogie Preprocessor took 121.65 ms. Allocated memory was 138.9 MB in the beginning and 200.8 MB in the end (delta: 61.9 MB). Free memory was 92.8 MB in the beginning and 179.5 MB in the end (delta: -86.7 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-21 19:53:43,648 INFO L168 Benchmark]: RCFGBuilder took 260.02 ms. Allocated memory is still 200.8 MB. Free memory was 178.9 MB in the beginning and 167.0 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 7.1 GB. [2020-08-21 19:53:43,648 INFO L168 Benchmark]: TraceAbstraction took 15553.40 ms. Allocated memory was 200.8 MB in the beginning and 374.9 MB in the end (delta: 174.1 MB). Free memory was 166.4 MB in the beginning and 125.5 MB in the end (delta: 40.8 MB). Peak memory consumption was 214.9 MB. Max. memory is 7.1 GB. [2020-08-21 19:53:43,652 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.31 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 281.81 ms. Allocated memory is still 138.9 MB. Free memory was 102.3 MB in the beginning and 92.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 121.65 ms. Allocated memory was 138.9 MB in the beginning and 200.8 MB in the end (delta: 61.9 MB). Free memory was 92.8 MB in the beginning and 179.5 MB in the end (delta: -86.7 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 260.02 ms. Allocated memory is still 200.8 MB. Free memory was 178.9 MB in the beginning and 167.0 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 15553.40 ms. Allocated memory was 200.8 MB in the beginning and 374.9 MB in the end (delta: 174.1 MB). Free memory was 166.4 MB in the beginning and 125.5 MB in the end (delta: 40.8 MB). Peak memory consumption was 214.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: k == 4 - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: k == 4 || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: k == 4 || (i <= 0 && j + 100 <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 15.2s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 11.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 28 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 37 PreInvPairs, 73 NumberOfFragments, 31 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3216 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 3.9s InterpolantComputationTime, 871 NumberOfCodeBlocks, 871 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 100903 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 1512/3323 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...