/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=SMALLEST --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 15:51:46,817 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 15:51:46,819 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 15:51:46,843 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 15:51:46,843 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 15:51:46,844 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 15:51:46,846 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 15:51:46,848 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 15:51:46,849 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 15:51:46,850 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 15:51:46,851 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 15:51:46,852 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 15:51:46,852 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 15:51:46,853 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 15:51:46,854 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 15:51:46,855 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 15:51:46,856 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 15:51:46,857 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 15:51:46,859 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 15:51:46,860 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 15:51:46,862 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 15:51:46,863 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 15:51:46,864 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 15:51:46,865 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 15:51:46,867 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 15:51:46,874 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 15:51:46,875 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 15:51:46,876 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 15:51:46,877 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 15:51:46,901 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 15:51:46,902 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 15:51:46,903 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 15:51:46,903 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 15:51:46,903 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 15:51:46,904 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 15:51:46,904 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 15:51:46,904 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 15:51:46,904 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 15:51:46,904 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 15:51:46,904 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 15:51:46,905 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 15:51:46,905 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 15:51:46,905 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 15:51:46,905 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 15:51:46,905 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 15:51:46,906 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 15:51:46,906 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 15:51:46,906 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 15:51:46,906 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 15:51:46,906 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 15:51:46,906 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:51:46,907 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 15:51:46,907 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 15:51:46,907 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 15:51:46,907 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 15:51:46,907 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 15:51:46,908 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 15:51:46,908 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 15:51:46,908 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=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 15:51:47,186 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 15:51:47,199 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 15:51:47,202 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 15:51:47,204 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 15:51:47,204 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 15:51:47,205 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-21 15:51:47,285 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e47b69347/78728e3f71464a2881dce4deb2d5ac3b/FLAG535c6fe14 [2020-08-21 15:51:47,777 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 15:51:47,778 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-21 15:51:47,784 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e47b69347/78728e3f71464a2881dce4deb2d5ac3b/FLAG535c6fe14 [2020-08-21 15:51:48,200 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e47b69347/78728e3f71464a2881dce4deb2d5ac3b [2020-08-21 15:51:48,210 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 15:51:48,212 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 15:51:48,213 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 15:51:48,213 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 15:51:48,217 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 15:51:48,218 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:51:48" (1/1) ... [2020-08-21 15:51:48,222 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1982a2cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:48, skipping insertion in model container [2020-08-21 15:51:48,222 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:51:48" (1/1) ... [2020-08-21 15:51:48,230 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 15:51:48,250 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 15:51:48,445 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:51:48,451 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 15:51:48,468 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:51:48,483 INFO L208 MainTranslator]: Completed translation [2020-08-21 15:51:48,483 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:48 WrapperNode [2020-08-21 15:51:48,483 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 15:51:48,484 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 15:51:48,484 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 15:51:48,484 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 15:51:48,498 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:48" (1/1) ... [2020-08-21 15:51:48,498 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:48" (1/1) ... [2020-08-21 15:51:48,577 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:48" (1/1) ... [2020-08-21 15:51:48,577 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:48" (1/1) ... [2020-08-21 15:51:48,581 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:48" (1/1) ... [2020-08-21 15:51:48,588 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:48" (1/1) ... [2020-08-21 15:51:48,589 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:48" (1/1) ... [2020-08-21 15:51:48,591 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 15:51:48,594 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 15:51:48,594 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 15:51:48,594 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 15:51:48,595 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:48" (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 15:51:48,660 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 15:51:48,660 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 15:51:48,660 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 15:51:48,661 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 15:51:48,661 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 15:51:48,661 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 15:51:48,662 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 15:51:48,662 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 15:51:48,663 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 15:51:48,664 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 15:51:48,664 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 15:51:48,664 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 15:51:48,664 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 15:51:48,879 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 15:51:48,879 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 15:51:48,883 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:51:48 BoogieIcfgContainer [2020-08-21 15:51:48,883 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 15:51:48,884 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 15:51:48,885 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 15:51:48,888 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 15:51:48,888 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:51:48" (1/3) ... [2020-08-21 15:51:48,889 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7bbd03cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:51:48, skipping insertion in model container [2020-08-21 15:51:48,889 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:48" (2/3) ... [2020-08-21 15:51:48,890 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7bbd03cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:51:48, skipping insertion in model container [2020-08-21 15:51:48,890 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:51:48" (3/3) ... [2020-08-21 15:51:48,892 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-21 15:51:48,903 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 15:51:48,911 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 15:51:48,927 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 15:51:48,959 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 15:51:48,960 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 15:51:48,960 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 15:51:48,960 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 15:51:48,960 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 15:51:48,960 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 15:51:48,960 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 15:51:48,961 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 15:51:48,986 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-21 15:51:48,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 15:51:48,994 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:48,995 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:48,996 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:49,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:49,004 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-21 15:51:49,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:49,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [335255256] [2020-08-21 15:51:49,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:49,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:49,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,159 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 15:51:49,160 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [335255256] [2020-08-21 15:51:49,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:51:49,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 15:51:49,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640323971] [2020-08-21 15:51:49,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 15:51:49,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:49,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 15:51:49,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 15:51:49,186 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-21 15:51:49,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:49,209 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-21 15:51:49,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 15:51:49,210 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-21 15:51:49,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:49,216 INFO L225 Difference]: With dead ends: 37 [2020-08-21 15:51:49,217 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 15:51:49,219 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 15:51:49,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 15:51:49,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 15:51:49,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 15:51:49,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-21 15:51:49,255 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-21 15:51:49,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:49,256 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-21 15:51:49,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 15:51:49,256 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-21 15:51:49,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 15:51:49,257 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:49,257 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:49,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 15:51:49,258 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:49,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:49,259 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-21 15:51:49,259 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:49,260 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2139201739] [2020-08-21 15:51:49,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:49,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:49,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,310 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 15:51:49,311 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2139201739] [2020-08-21 15:51:49,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:51:49,311 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 15:51:49,312 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282367675] [2020-08-21 15:51:49,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 15:51:49,313 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:49,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 15:51:49,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 15:51:49,314 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-21 15:51:49,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:49,330 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-21 15:51:49,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 15:51:49,331 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 15:51:49,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:49,332 INFO L225 Difference]: With dead ends: 20 [2020-08-21 15:51:49,332 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 15:51:49,333 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 15:51:49,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 15:51:49,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 15:51:49,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 15:51:49,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 15:51:49,339 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-21 15:51:49,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:49,339 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 15:51:49,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 15:51:49,339 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 15:51:49,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 15:51:49,340 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:49,340 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:49,341 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 15:51:49,341 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:49,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:49,342 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-21 15:51:49,342 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:49,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1709842492] [2020-08-21 15:51:49,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:49,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:49,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,391 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 15:51:49,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1709842492] [2020-08-21 15:51:49,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:51:49,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 15:51:49,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575526782] [2020-08-21 15:51:49,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 15:51:49,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:49,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 15:51:49,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 15:51:49,397 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-21 15:51:49,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:49,420 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-21 15:51:49,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 15:51:49,422 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-21 15:51:49,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:49,423 INFO L225 Difference]: With dead ends: 25 [2020-08-21 15:51:49,423 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 15:51:49,424 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 15:51:49,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 15:51:49,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 15:51:49,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 15:51:49,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 15:51:49,430 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-21 15:51:49,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:49,430 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 15:51:49,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 15:51:49,431 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 15:51:49,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 15:51:49,431 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:49,432 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:49,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 15:51:49,432 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:49,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:49,433 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-21 15:51:49,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:49,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [835118664] [2020-08-21 15:51:49,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:49,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:49,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,484 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 15:51:49,485 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [835118664] [2020-08-21 15:51:49,485 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:49,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 15:51:49,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029057521] [2020-08-21 15:51:49,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:51:49,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:49,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:51:49,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:51:49,488 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-21 15:51:49,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:49,543 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-21 15:51:49,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:51:49,544 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-21 15:51:49,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:49,545 INFO L225 Difference]: With dead ends: 26 [2020-08-21 15:51:49,545 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 15:51:49,546 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 15:51:49,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 15:51:49,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 15:51:49,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 15:51:49,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-21 15:51:49,552 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-21 15:51:49,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:49,553 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-21 15:51:49,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:51:49,553 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-21 15:51:49,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 15:51:49,554 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:49,554 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:49,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 15:51:49,555 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:49,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:49,555 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-21 15:51:49,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:49,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1783063981] [2020-08-21 15:51:49,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:49,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:49,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,640 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 15:51:49,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1783063981] [2020-08-21 15:51:49,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:49,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 15:51:49,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677618757] [2020-08-21 15:51:49,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:51:49,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:49,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:51:49,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:51:49,647 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-21 15:51:49,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:49,734 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-21 15:51:49,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 15:51:49,735 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-21 15:51:49,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:49,736 INFO L225 Difference]: With dead ends: 27 [2020-08-21 15:51:49,736 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 15:51:49,737 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 15:51:49,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 15:51:49,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 15:51:49,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 15:51:49,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-21 15:51:49,742 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-21 15:51:49,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:49,743 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-21 15:51:49,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:51:49,743 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-21 15:51:49,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 15:51:49,744 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:49,744 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:49,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 15:51:49,744 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:49,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:49,745 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-21 15:51:49,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:49,746 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [467929564] [2020-08-21 15:51:49,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:49,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:49,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,818 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 15:51:49,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [467929564] [2020-08-21 15:51:49,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:49,819 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 15:51:49,819 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441362400] [2020-08-21 15:51:49,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:51:49,820 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:49,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:51:49,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:51:49,821 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-21 15:51:49,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:49,921 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-21 15:51:49,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:51:49,922 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-21 15:51:49,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:49,923 INFO L225 Difference]: With dead ends: 28 [2020-08-21 15:51:49,923 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 15:51:49,924 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 15:51:49,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 15:51:49,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 15:51:49,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 15:51:49,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-21 15:51:49,930 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-21 15:51:49,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:49,931 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-21 15:51:49,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:51:49,931 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-21 15:51:49,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 15:51:49,932 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:49,932 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:49,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 15:51:49,933 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:49,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:49,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-21 15:51:49,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:49,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53691269] [2020-08-21 15:51:49,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:49,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:50,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,030 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 15:51:50,031 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53691269] [2020-08-21 15:51:50,031 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:50,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 15:51:50,032 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589733266] [2020-08-21 15:51:50,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 15:51:50,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:50,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 15:51:50,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:51:50,033 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-21 15:51:50,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:50,152 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 15:51:50,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 15:51:50,153 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-21 15:51:50,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:50,154 INFO L225 Difference]: With dead ends: 29 [2020-08-21 15:51:50,154 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 15:51:50,155 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 15:51:50,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 15:51:50,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 15:51:50,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 15:51:50,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-21 15:51:50,161 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-21 15:51:50,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:50,161 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-21 15:51:50,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 15:51:50,161 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-21 15:51:50,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 15:51:50,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:50,162 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:50,162 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 15:51:50,163 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:50,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:50,163 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-21 15:51:50,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:50,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [24964982] [2020-08-21 15:51:50,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:50,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:50,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,280 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 15:51:50,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [24964982] [2020-08-21 15:51:50,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:50,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 15:51:50,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256677814] [2020-08-21 15:51:50,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 15:51:50,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:50,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 15:51:50,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:51:50,287 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-21 15:51:50,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:50,471 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-21 15:51:50,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 15:51:50,472 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-21 15:51:50,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:50,473 INFO L225 Difference]: With dead ends: 30 [2020-08-21 15:51:50,473 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 15:51:50,475 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 15:51:50,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 15:51:50,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 15:51:50,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 15:51:50,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-21 15:51:50,480 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-21 15:51:50,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:50,481 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-21 15:51:50,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 15:51:50,481 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-21 15:51:50,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 15:51:50,482 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:50,482 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:50,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 15:51:50,482 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:50,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:50,482 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-21 15:51:50,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:50,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1612201868] [2020-08-21 15:51:50,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:50,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:50,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,521 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 15:51:50,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1612201868] [2020-08-21 15:51:50,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:50,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 15:51:50,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002922636] [2020-08-21 15:51:50,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 15:51:50,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:50,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 15:51:50,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:51:50,524 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-21 15:51:50,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:50,540 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-21 15:51:50,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 15:51:50,541 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 15:51:50,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:50,542 INFO L225 Difference]: With dead ends: 30 [2020-08-21 15:51:50,542 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 15:51:50,543 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 15:51:50,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 15:51:50,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 15:51:50,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 15:51:50,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-21 15:51:50,549 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-21 15:51:50,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:50,549 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-21 15:51:50,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 15:51:50,549 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-21 15:51:50,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 15:51:50,550 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:50,550 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:50,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 15:51:50,551 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:50,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:50,551 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-21 15:51:50,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:50,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227192970] [2020-08-21 15:51:50,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:50,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:50,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,592 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 15:51:50,593 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227192970] [2020-08-21 15:51:50,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:50,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 15:51:50,594 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127250629] [2020-08-21 15:51:50,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:51:50,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:50,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:51:50,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:51:50,595 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-21 15:51:50,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:50,615 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-21 15:51:50,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:51:50,615 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-21 15:51:50,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:50,616 INFO L225 Difference]: With dead ends: 34 [2020-08-21 15:51:50,616 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 15:51:50,617 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 15:51:50,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 15:51:50,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 15:51:50,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 15:51:50,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-21 15:51:50,623 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-21 15:51:50,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:50,623 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-21 15:51:50,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:51:50,624 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-21 15:51:50,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 15:51:50,624 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:50,625 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:50,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 15:51:50,625 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:50,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:50,625 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-21 15:51:50,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:50,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2114048576] [2020-08-21 15:51:50,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:50,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:50,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,675 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 15:51:50,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2114048576] [2020-08-21 15:51:50,676 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:50,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 15:51:50,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662850976] [2020-08-21 15:51:50,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:51:50,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:50,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:51:50,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:51:50,677 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-21 15:51:50,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:50,701 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-21 15:51:50,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 15:51:50,701 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-21 15:51:50,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:50,702 INFO L225 Difference]: With dead ends: 38 [2020-08-21 15:51:50,702 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 15:51:50,703 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 15:51:50,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 15:51:50,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 15:51:50,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 15:51:50,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-21 15:51:50,709 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-21 15:51:50,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:50,710 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-21 15:51:50,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:51:50,710 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-21 15:51:50,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 15:51:50,711 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:50,711 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:50,711 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 15:51:50,711 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:50,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:50,712 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-21 15:51:50,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:50,712 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [979935686] [2020-08-21 15:51:50,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:50,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:50,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,799 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 15:51:50,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [979935686] [2020-08-21 15:51:50,800 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:50,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 15:51:50,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259700300] [2020-08-21 15:51:50,801 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 15:51:50,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:50,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 15:51:50,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:51:50,802 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-21 15:51:50,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:50,982 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-21 15:51:50,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 15:51:50,983 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-21 15:51:50,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:50,984 INFO L225 Difference]: With dead ends: 54 [2020-08-21 15:51:50,984 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 15:51:50,985 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 15:51:50,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 15:51:50,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 15:51:50,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 15:51:50,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-21 15:51:50,992 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-21 15:51:50,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:50,992 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-21 15:51:50,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 15:51:50,993 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-21 15:51:50,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 15:51:50,994 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:50,994 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:50,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 15:51:50,995 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:50,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:50,995 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-21 15:51:50,995 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:50,996 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [590858051] [2020-08-21 15:51:50,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:51,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:51,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:51,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:51,128 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 15:51:51,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [590858051] [2020-08-21 15:51:51,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:51,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 15:51:51,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532429878] [2020-08-21 15:51:51,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 15:51:51,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:51,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 15:51:51,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:51:51,131 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-21 15:51:51,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:51,327 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-21 15:51:51,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 15:51:51,327 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-21 15:51:51,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:51,328 INFO L225 Difference]: With dead ends: 55 [2020-08-21 15:51:51,328 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 15:51:51,329 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 15:51:51,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 15:51:51,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 15:51:51,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 15:51:51,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-21 15:51:51,335 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-21 15:51:51,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:51,336 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-21 15:51:51,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 15:51:51,336 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-21 15:51:51,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 15:51:51,336 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:51,337 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:51,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 15:51:51,337 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:51,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:51,337 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-21 15:51:51,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:51,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92898541] [2020-08-21 15:51:51,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:51,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:51,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:51,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:51,439 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 15:51:51,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92898541] [2020-08-21 15:51:51,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:51,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 15:51:51,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107486628] [2020-08-21 15:51:51,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 15:51:51,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:51,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 15:51:51,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:51:51,441 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-21 15:51:51,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:51,667 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-21 15:51:51,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 15:51:51,667 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 15:51:51,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:51,668 INFO L225 Difference]: With dead ends: 56 [2020-08-21 15:51:51,668 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 15:51:51,669 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 15:51:51,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 15:51:51,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 15:51:51,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 15:51:51,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-21 15:51:51,675 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-21 15:51:51,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:51,675 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-21 15:51:51,676 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 15:51:51,676 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-21 15:51:51,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 15:51:51,676 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:51,677 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:51,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 15:51:51,677 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:51,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:51,677 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-21 15:51:51,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:51,678 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1222474354] [2020-08-21 15:51:51,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:51,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:51,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:51,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:51,805 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 15:51:51,805 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1222474354] [2020-08-21 15:51:51,805 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:51,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 15:51:51,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068867522] [2020-08-21 15:51:51,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 15:51:51,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:51,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 15:51:51,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:51:51,807 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-21 15:51:52,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:52,087 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-21 15:51:52,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 15:51:52,088 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-21 15:51:52,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:52,088 INFO L225 Difference]: With dead ends: 57 [2020-08-21 15:51:52,089 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 15:51:52,089 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 15:51:52,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 15:51:52,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 15:51:52,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 15:51:52,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-21 15:51:52,096 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-21 15:51:52,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:52,096 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-21 15:51:52,096 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 15:51:52,096 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-21 15:51:52,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 15:51:52,097 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:52,097 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:52,097 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 15:51:52,097 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:52,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:52,098 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-21 15:51:52,098 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:52,098 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179935800] [2020-08-21 15:51:52,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:52,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:52,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:52,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:52,221 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 15:51:52,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179935800] [2020-08-21 15:51:52,222 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:52,222 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 15:51:52,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009066965] [2020-08-21 15:51:52,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 15:51:52,223 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:52,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 15:51:52,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:51:52,224 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-21 15:51:52,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:52,574 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-21 15:51:52,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 15:51:52,574 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 15:51:52,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:52,575 INFO L225 Difference]: With dead ends: 58 [2020-08-21 15:51:52,575 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 15:51:52,576 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 15:51:52,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 15:51:52,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 15:51:52,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 15:51:52,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-21 15:51:52,594 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-21 15:51:52,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:52,595 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-21 15:51:52,595 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 15:51:52,595 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-21 15:51:52,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 15:51:52,596 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:52,596 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:52,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 15:51:52,596 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:52,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:52,597 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-21 15:51:52,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:52,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460918915] [2020-08-21 15:51:52,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:52,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:52,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:52,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:52,746 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 15:51:52,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460918915] [2020-08-21 15:51:52,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:52,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 15:51:52,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586310467] [2020-08-21 15:51:52,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 15:51:52,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:52,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 15:51:52,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:51:52,748 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-21 15:51:53,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:53,123 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-21 15:51:53,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 15:51:53,126 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-21 15:51:53,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:53,127 INFO L225 Difference]: With dead ends: 59 [2020-08-21 15:51:53,127 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 15:51:53,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-21 15:51:53,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 15:51:53,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 15:51:53,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 15:51:53,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-21 15:51:53,136 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-21 15:51:53,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:53,136 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-21 15:51:53,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 15:51:53,136 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-21 15:51:53,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 15:51:53,137 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:53,137 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:53,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 15:51:53,138 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:53,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:53,138 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-21 15:51:53,138 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:53,138 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [207317937] [2020-08-21 15:51:53,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:53,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:53,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:53,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:53,300 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 15:51:53,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [207317937] [2020-08-21 15:51:53,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:53,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 15:51:53,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315482804] [2020-08-21 15:51:53,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 15:51:53,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:53,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 15:51:53,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-21 15:51:53,302 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-21 15:51:53,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:53,749 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-21 15:51:53,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 15:51:53,750 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-21 15:51:53,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:53,751 INFO L225 Difference]: With dead ends: 60 [2020-08-21 15:51:53,751 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 15:51:53,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-21 15:51:53,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 15:51:53,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 15:51:53,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 15:51:53,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-21 15:51:53,760 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-21 15:51:53,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:53,760 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-21 15:51:53,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 15:51:53,760 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-21 15:51:53,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 15:51:53,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:53,761 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:53,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 15:51:53,762 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:53,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:53,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-21 15:51:53,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:53,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [872788529] [2020-08-21 15:51:53,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:53,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:54,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:54,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:54,008 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 15:51:54,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [872788529] [2020-08-21 15:51:54,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:54,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 15:51:54,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312629712] [2020-08-21 15:51:54,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 15:51:54,009 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:54,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 15:51:54,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-21 15:51:54,010 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-21 15:51:54,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:54,494 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-21 15:51:54,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 15:51:54,496 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-21 15:51:54,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:54,497 INFO L225 Difference]: With dead ends: 61 [2020-08-21 15:51:54,497 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 15:51:54,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-21 15:51:54,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 15:51:54,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 15:51:54,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 15:51:54,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-21 15:51:54,505 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-21 15:51:54,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:54,505 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-21 15:51:54,506 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 15:51:54,506 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-21 15:51:54,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 15:51:54,506 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:54,506 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:54,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 15:51:54,507 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:54,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:54,507 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-21 15:51:54,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:54,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1706145795] [2020-08-21 15:51:54,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:54,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:54,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:54,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:54,715 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 15:51:54,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1706145795] [2020-08-21 15:51:54,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:54,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 15:51:54,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443724876] [2020-08-21 15:51:54,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 15:51:54,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:54,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 15:51:54,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-21 15:51:54,717 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-21 15:51:55,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:55,295 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-21 15:51:55,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 15:51:55,296 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-21 15:51:55,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:55,296 INFO L225 Difference]: With dead ends: 62 [2020-08-21 15:51:55,297 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 15:51:55,297 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 15:51:55,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 15:51:55,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 15:51:55,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 15:51:55,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-21 15:51:55,304 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-21 15:51:55,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:55,304 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-21 15:51:55,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 15:51:55,304 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-21 15:51:55,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 15:51:55,305 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:55,305 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:55,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 15:51:55,305 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:55,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:55,306 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-21 15:51:55,306 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:55,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1626431522] [2020-08-21 15:51:55,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:55,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:55,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:55,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:55,527 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 15:51:55,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1626431522] [2020-08-21 15:51:55,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:55,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 15:51:55,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873752199] [2020-08-21 15:51:55,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 15:51:55,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:55,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 15:51:55,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-21 15:51:55,529 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-21 15:51:56,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:56,149 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-21 15:51:56,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 15:51:56,152 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-21 15:51:56,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:56,153 INFO L225 Difference]: With dead ends: 63 [2020-08-21 15:51:56,153 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 15:51:56,154 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 15:51:56,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 15:51:56,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 15:51:56,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 15:51:56,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-21 15:51:56,160 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-21 15:51:56,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:56,161 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-21 15:51:56,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 15:51:56,161 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-21 15:51:56,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 15:51:56,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:56,162 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:56,162 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 15:51:56,162 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:56,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:56,163 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-21 15:51:56,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:56,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1687981854] [2020-08-21 15:51:56,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:56,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:56,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:56,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:56,437 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 15:51:56,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1687981854] [2020-08-21 15:51:56,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:56,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 15:51:56,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14378442] [2020-08-21 15:51:56,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 15:51:56,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:56,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 15:51:56,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-21 15:51:56,439 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-21 15:51:57,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:57,118 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-21 15:51:57,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 15:51:57,119 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-21 15:51:57,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:57,120 INFO L225 Difference]: With dead ends: 64 [2020-08-21 15:51:57,120 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 15:51:57,121 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 15:51:57,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 15:51:57,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 15:51:57,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 15:51:57,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-21 15:51:57,129 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-21 15:51:57,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:57,129 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-21 15:51:57,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 15:51:57,129 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-21 15:51:57,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 15:51:57,130 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:57,130 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:57,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 15:51:57,131 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:57,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:57,131 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-21 15:51:57,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:57,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1288562118] [2020-08-21 15:51:57,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:57,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:57,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:57,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:57,424 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 15:51:57,424 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1288562118] [2020-08-21 15:51:57,424 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:57,424 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 15:51:57,425 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331579001] [2020-08-21 15:51:57,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 15:51:57,425 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:57,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 15:51:57,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-21 15:51:57,426 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-21 15:51:58,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:58,185 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-21 15:51:58,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 15:51:58,186 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-21 15:51:58,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:58,186 INFO L225 Difference]: With dead ends: 65 [2020-08-21 15:51:58,187 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 15:51:58,188 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 15:51:58,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 15:51:58,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 15:51:58,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 15:51:58,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-21 15:51:58,196 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-21 15:51:58,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:58,196 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-21 15:51:58,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 15:51:58,196 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-21 15:51:58,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 15:51:58,197 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:58,197 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:58,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 15:51:58,197 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:58,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:58,198 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-21 15:51:58,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:58,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1116443353] [2020-08-21 15:51:58,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:58,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:58,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:58,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:58,486 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 15:51:58,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1116443353] [2020-08-21 15:51:58,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:58,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 15:51:58,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325103233] [2020-08-21 15:51:58,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 15:51:58,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:58,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 15:51:58,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-21 15:51:58,488 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-21 15:51:59,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:59,366 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-21 15:51:59,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 15:51:59,367 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-21 15:51:59,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:59,368 INFO L225 Difference]: With dead ends: 66 [2020-08-21 15:51:59,368 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 15:51:59,369 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 15:51:59,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 15:51:59,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 15:51:59,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 15:51:59,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-21 15:51:59,374 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-21 15:51:59,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:59,375 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-21 15:51:59,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 15:51:59,375 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-21 15:51:59,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 15:51:59,375 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:59,375 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:59,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 15:51:59,376 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:59,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:59,376 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-21 15:51:59,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:59,376 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1327807977] [2020-08-21 15:51:59,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:59,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:59,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:59,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:59,699 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 15:51:59,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1327807977] [2020-08-21 15:51:59,700 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:59,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 15:51:59,700 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932745725] [2020-08-21 15:51:59,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 15:51:59,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:59,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 15:51:59,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-21 15:51:59,701 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-21 15:52:00,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:00,663 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-21 15:52:00,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 15:52:00,664 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-21 15:52:00,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:00,665 INFO L225 Difference]: With dead ends: 67 [2020-08-21 15:52:00,665 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 15:52:00,666 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 15:52:00,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 15:52:00,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 15:52:00,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 15:52:00,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-21 15:52:00,673 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-21 15:52:00,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:00,673 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-21 15:52:00,673 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 15:52:00,673 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-21 15:52:00,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 15:52:00,674 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:00,674 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:00,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 15:52:00,674 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:00,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:00,675 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-21 15:52:00,675 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:00,675 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [565585649] [2020-08-21 15:52:00,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:00,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:01,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:01,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:01,053 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 15:52:01,053 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [565585649] [2020-08-21 15:52:01,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:01,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 15:52:01,054 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485160485] [2020-08-21 15:52:01,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 15:52:01,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:01,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 15:52:01,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-21 15:52:01,055 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-21 15:52:02,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:02,088 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-21 15:52:02,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 15:52:02,091 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-21 15:52:02,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:02,091 INFO L225 Difference]: With dead ends: 68 [2020-08-21 15:52:02,091 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 15:52:02,092 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 15:52:02,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 15:52:02,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 15:52:02,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 15:52:02,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-21 15:52:02,099 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-21 15:52:02,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:02,099 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-21 15:52:02,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 15:52:02,099 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-21 15:52:02,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 15:52:02,100 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:02,100 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:02,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 15:52:02,100 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:02,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:02,100 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-21 15:52:02,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:02,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2087890165] [2020-08-21 15:52:02,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:02,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:02,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:02,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:02,450 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 15:52:02,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2087890165] [2020-08-21 15:52:02,451 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:02,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 15:52:02,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122462476] [2020-08-21 15:52:02,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 15:52:02,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:02,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 15:52:02,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-21 15:52:02,456 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-21 15:52:03,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:03,589 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-21 15:52:03,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 15:52:03,590 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-21 15:52:03,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:03,591 INFO L225 Difference]: With dead ends: 69 [2020-08-21 15:52:03,591 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 15:52:03,592 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 15:52:03,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 15:52:03,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 15:52:03,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 15:52:03,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-21 15:52:03,600 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-21 15:52:03,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:03,600 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-21 15:52:03,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 15:52:03,600 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-21 15:52:03,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 15:52:03,600 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:03,601 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:03,601 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 15:52:03,601 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:03,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:03,601 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-21 15:52:03,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:03,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [121879542] [2020-08-21 15:52:03,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:03,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:03,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:03,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:03,646 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 15:52:03,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [121879542] [2020-08-21 15:52:03,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:52:03,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:52:03,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741212918] [2020-08-21 15:52:03,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:52:03,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:03,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:52:03,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:52:03,648 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-21 15:52:03,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:03,677 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-21 15:52:03,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:52:03,678 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-21 15:52:03,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:03,678 INFO L225 Difference]: With dead ends: 66 [2020-08-21 15:52:03,678 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 15:52:03,679 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 15:52:03,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 15:52:03,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 15:52:03,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 15:52:03,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 15:52:03,679 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-21 15:52:03,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:03,680 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 15:52:03,680 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:52:03,680 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 15:52:03,680 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 15:52:03,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 15:52:03,683 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 15:52:03,876 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-21 15:52:03,876 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-21 15:52:03,876 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-21 15:52:03,876 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-21 15:52:03,876 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-21 15:52:03,877 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-21 15:52:03,877 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-21 15:52:03,877 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-21 15:52:03,877 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-21 15:52:03,877 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-21 15:52:03,877 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-21 15:52:03,877 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-21 15:52:03,877 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-21 15:52:03,878 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-21 15:52:03,878 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-21 15:52:03,878 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 15:52:03,878 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 15:52:03,878 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-21 15:52:03,878 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-21 15:52:03,878 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-21 15:52:03,879 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-21 15:52:03,880 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-21 15:52:03,880 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-21 15:52:03,880 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-21 15:52:03,880 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-21 15:52:03,903 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 03:52:03 BoogieIcfgContainer [2020-08-21 15:52:03,903 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 15:52:03,905 INFO L168 Benchmark]: Toolchain (without parser) took 15692.92 ms. Allocated memory was 138.4 MB in the beginning and 383.8 MB in the end (delta: 245.4 MB). Free memory was 101.5 MB in the beginning and 213.9 MB in the end (delta: -112.4 MB). Peak memory consumption was 133.0 MB. Max. memory is 7.1 GB. [2020-08-21 15:52:03,906 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 138.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 15:52:03,907 INFO L168 Benchmark]: CACSL2BoogieTranslator took 270.65 ms. Allocated memory is still 138.4 MB. Free memory was 101.3 MB in the beginning and 91.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-08-21 15:52:03,907 INFO L168 Benchmark]: Boogie Preprocessor took 107.01 ms. Allocated memory was 138.4 MB in the beginning and 200.8 MB in the end (delta: 62.4 MB). Free memory was 91.8 MB in the beginning and 179.5 MB in the end (delta: -87.7 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-21 15:52:03,908 INFO L168 Benchmark]: RCFGBuilder took 289.23 ms. Allocated memory is still 200.8 MB. Free memory was 178.8 MB in the beginning and 166.5 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-08-21 15:52:03,909 INFO L168 Benchmark]: TraceAbstraction took 15018.67 ms. Allocated memory was 200.8 MB in the beginning and 383.8 MB in the end (delta: 183.0 MB). Free memory was 165.9 MB in the beginning and 213.9 MB in the end (delta: -48.0 MB). Peak memory consumption was 135.0 MB. Max. memory is 7.1 GB. [2020-08-21 15:52:03,912 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 138.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 270.65 ms. Allocated memory is still 138.4 MB. Free memory was 101.3 MB in the beginning and 91.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 107.01 ms. Allocated memory was 138.4 MB in the beginning and 200.8 MB in the end (delta: 62.4 MB). Free memory was 91.8 MB in the beginning and 179.5 MB in the end (delta: -87.7 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 289.23 ms. Allocated memory is still 200.8 MB. Free memory was 178.8 MB in the beginning and 166.5 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 15018.67 ms. Allocated memory was 200.8 MB in the beginning and 383.8 MB in the end (delta: 183.0 MB). Free memory was 165.9 MB in the beginning and 213.9 MB in the end (delta: -48.0 MB). Peak memory consumption was 135.0 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: 14.7s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 9.9s, 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, 1.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 11.3s 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: 0.1s 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, 3.8s 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...