/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.8 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum04-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 02:05:02,772 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-19 02:05:02,816 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 02:05:02,820 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 02:05:02,821 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 02:05:02,826 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 02:05:02,831 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 02:05:02,832 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 02:05:02,836 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 02:05:02,837 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 02:05:02,838 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 02:05:02,838 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 02:05:02,839 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 02:05:02,840 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 02:05:02,841 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 02:05:02,842 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 02:05:02,844 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 02:05:02,845 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 02:05:02,847 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 02:05:02,848 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 02:05:02,849 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 02:05:02,850 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 02:05:02,852 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 02:05:02,859 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 02:05:02,860 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 02:05:02,861 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 02:05:02,862 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 02:05:02,886 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 02:05:02,886 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 02:05:02,887 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 02:05:02,888 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 02:05:02,888 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 02:05:02,888 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 02:05:02,888 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 02:05:02,888 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 02:05:02,889 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 02:05:02,889 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 02:05:02,889 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 02:05:02,889 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 02:05:02,889 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 02:05:02,890 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 02:05:02,890 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 02:05:02,890 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 02:05:02,890 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 02:05:02,890 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 02:05:02,891 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 02:05:02,891 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 02:05:02,891 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 02:05:02,891 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:05:02,891 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 02:05:02,892 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 02:05:02,892 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 02:05:02,892 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 02:05:02,892 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 02:05:02,892 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 02:05:02,893 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 02:05:02,893 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; [2020-08-19 02:05:03,199 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 02:05:03,217 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 02:05:03,221 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 02:05:03,223 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 02:05:03,223 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 02:05:03,224 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum04-2.i [2020-08-19 02:05:03,287 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f3f50b485/ce348663284a4878825432f70382b3a3/FLAGe0d34f02d [2020-08-19 02:05:03,734 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 02:05:03,735 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/sum04-2.i [2020-08-19 02:05:03,741 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f3f50b485/ce348663284a4878825432f70382b3a3/FLAGe0d34f02d [2020-08-19 02:05:04,146 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f3f50b485/ce348663284a4878825432f70382b3a3 [2020-08-19 02:05:04,154 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 02:05:04,156 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 02:05:04,157 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 02:05:04,157 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 02:05:04,160 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 02:05:04,161 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:05:04" (1/1) ... [2020-08-19 02:05:04,165 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f046123 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:04, skipping insertion in model container [2020-08-19 02:05:04,165 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:05:04" (1/1) ... [2020-08-19 02:05:04,173 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 02:05:04,191 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 02:05:04,415 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:05:04,419 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 02:05:04,432 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:05:04,444 INFO L208 MainTranslator]: Completed translation [2020-08-19 02:05:04,444 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:04 WrapperNode [2020-08-19 02:05:04,444 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 02:05:04,445 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 02:05:04,445 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 02:05:04,445 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 02:05:04,458 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:04" (1/1) ... [2020-08-19 02:05:04,459 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:04" (1/1) ... [2020-08-19 02:05:04,464 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:04" (1/1) ... [2020-08-19 02:05:04,464 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:04" (1/1) ... [2020-08-19 02:05:04,545 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:04" (1/1) ... [2020-08-19 02:05:04,552 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:04" (1/1) ... [2020-08-19 02:05:04,553 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:04" (1/1) ... [2020-08-19 02:05:04,554 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 02:05:04,555 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 02:05:04,555 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 02:05:04,555 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 02:05:04,556 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:04" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:05:04,617 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 02:05:04,617 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 02:05:04,618 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 02:05:04,618 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 02:05:04,619 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 02:05:04,619 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 02:05:04,619 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 02:05:04,619 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 02:05:04,619 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 02:05:04,797 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 02:05:04,797 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 02:05:04,801 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:05:04 BoogieIcfgContainer [2020-08-19 02:05:04,801 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 02:05:04,802 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 02:05:04,802 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 02:05:04,806 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 02:05:04,806 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 02:05:04" (1/3) ... [2020-08-19 02:05:04,807 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74065aec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:05:04, skipping insertion in model container [2020-08-19 02:05:04,807 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:04" (2/3) ... [2020-08-19 02:05:04,808 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74065aec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:05:04, skipping insertion in model container [2020-08-19 02:05:04,808 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:05:04" (3/3) ... [2020-08-19 02:05:04,810 INFO L109 eAbstractionObserver]: Analyzing ICFG sum04-2.i [2020-08-19 02:05:04,819 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 02:05:04,826 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 02:05:04,841 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 02:05:04,865 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 02:05:04,866 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 02:05:04,866 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 02:05:04,866 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 02:05:04,866 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 02:05:04,866 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 02:05:04,867 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 02:05:04,867 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 02:05:04,884 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-08-19 02:05:04,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 02:05:04,890 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:04,891 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:04,892 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:04,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:04,898 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2020-08-19 02:05:04,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:04,908 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1458411422] [2020-08-19 02:05:04,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:04,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:05,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,018 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:05,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1458411422] [2020-08-19 02:05:05,021 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:05:05,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-19 02:05:05,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084621914] [2020-08-19 02:05:05,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-19 02:05:05,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:05,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-19 02:05:05,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 02:05:05,048 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2020-08-19 02:05:05,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:05,072 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2020-08-19 02:05:05,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-19 02:05:05,074 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-19 02:05:05,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:05,083 INFO L225 Difference]: With dead ends: 29 [2020-08-19 02:05:05,084 INFO L226 Difference]: Without dead ends: 12 [2020-08-19 02:05:05,087 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 [2020-08-19 02:05:05,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-19 02:05:05,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-19 02:05:05,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-19 02:05:05,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-19 02:05:05,129 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-19 02:05:05,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:05,129 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-19 02:05:05,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-19 02:05:05,130 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-19 02:05:05,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 02:05:05,131 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:05,131 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:05,132 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 02:05:05,132 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:05,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:05,133 INFO L82 PathProgramCache]: Analyzing trace with hash -15914692, now seen corresponding path program 1 times [2020-08-19 02:05:05,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:05,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1294541668] [2020-08-19 02:05:05,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:05,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:05,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,197 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:05,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1294541668] [2020-08-19 02:05:05,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:05:05,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 02:05:05,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353013770] [2020-08-19 02:05:05,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 02:05:05,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:05,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 02:05:05,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 02:05:05,202 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2020-08-19 02:05:05,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:05,221 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-19 02:05:05,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 02:05:05,222 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-19 02:05:05,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:05,223 INFO L225 Difference]: With dead ends: 19 [2020-08-19 02:05:05,223 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 02:05:05,225 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 [2020-08-19 02:05:05,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 02:05:05,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2020-08-19 02:05:05,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-19 02:05:05,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-19 02:05:05,230 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2020-08-19 02:05:05,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:05,231 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-19 02:05:05,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 02:05:05,231 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-19 02:05:05,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 02:05:05,232 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:05,233 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:05,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 02:05:05,233 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:05,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:05,234 INFO L82 PathProgramCache]: Analyzing trace with hash -1244203718, now seen corresponding path program 1 times [2020-08-19 02:05:05,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:05,235 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1300928572] [2020-08-19 02:05:05,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:05,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:05,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,294 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:05,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1300928572] [2020-08-19 02:05:05,295 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:05,296 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-19 02:05:05,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50103268] [2020-08-19 02:05:05,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 02:05:05,297 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:05,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 02:05:05,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:05:05,298 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 4 states. [2020-08-19 02:05:05,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:05,333 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-19 02:05:05,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 02:05:05,334 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-19 02:05:05,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:05,335 INFO L225 Difference]: With dead ends: 21 [2020-08-19 02:05:05,335 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 02:05:05,336 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 [2020-08-19 02:05:05,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 02:05:05,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-19 02:05:05,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 02:05:05,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-19 02:05:05,342 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-19 02:05:05,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:05,343 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-19 02:05:05,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 02:05:05,344 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-19 02:05:05,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 02:05:05,345 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:05,345 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:05,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 02:05:05,346 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:05,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:05,346 INFO L82 PathProgramCache]: Analyzing trace with hash -513951304, now seen corresponding path program 2 times [2020-08-19 02:05:05,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:05,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241429393] [2020-08-19 02:05:05,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:05,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:05,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,424 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:05,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1241429393] [2020-08-19 02:05:05,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:05,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 02:05:05,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072329881] [2020-08-19 02:05:05,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:05:05,427 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:05,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:05:05,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:05:05,428 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-19 02:05:05,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:05,478 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-19 02:05:05,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:05:05,479 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-19 02:05:05,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:05,480 INFO L225 Difference]: With dead ends: 23 [2020-08-19 02:05:05,480 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 02:05:05,481 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 [2020-08-19 02:05:05,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 02:05:05,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-19 02:05:05,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 02:05:05,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 02:05:05,487 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-19 02:05:05,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:05,487 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 02:05:05,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:05:05,488 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 02:05:05,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 02:05:05,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:05,489 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:05,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 02:05:05,489 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:05,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:05,490 INFO L82 PathProgramCache]: Analyzing trace with hash 1178949302, now seen corresponding path program 3 times [2020-08-19 02:05:05,490 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:05,490 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [946824867] [2020-08-19 02:05:05,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:05,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:05,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,577 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:05,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [946824867] [2020-08-19 02:05:05,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:05,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 02:05:05,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97370700] [2020-08-19 02:05:05,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 02:05:05,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:05,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 02:05:05,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:05:05,580 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-19 02:05:05,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:05,612 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-19 02:05:05,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 02:05:05,612 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-19 02:05:05,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:05,613 INFO L225 Difference]: With dead ends: 25 [2020-08-19 02:05:05,614 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 02:05:05,614 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 [2020-08-19 02:05:05,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 02:05:05,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-19 02:05:05,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 02:05:05,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-19 02:05:05,620 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-19 02:05:05,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:05,621 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-19 02:05:05,621 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 02:05:05,621 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-19 02:05:05,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 02:05:05,622 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:05,622 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:05,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 02:05:05,623 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:05,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:05,623 INFO L82 PathProgramCache]: Analyzing trace with hash 263826484, now seen corresponding path program 4 times [2020-08-19 02:05:05,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:05,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [319607717] [2020-08-19 02:05:05,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:05,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:05,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,716 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:05,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [319607717] [2020-08-19 02:05:05,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:05,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 02:05:05,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879073747] [2020-08-19 02:05:05,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 02:05:05,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:05,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 02:05:05,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-08-19 02:05:05,719 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-19 02:05:05,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:05,751 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-19 02:05:05,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 02:05:05,752 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-19 02:05:05,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:05,753 INFO L225 Difference]: With dead ends: 27 [2020-08-19 02:05:05,753 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 02:05:05,753 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-08-19 02:05:05,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 02:05:05,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-19 02:05:05,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 02:05:05,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-19 02:05:05,759 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-19 02:05:05,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:05,760 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-19 02:05:05,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 02:05:05,760 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-19 02:05:05,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 02:05:05,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:05,761 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:05,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 02:05:05,762 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:05,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:05,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1299094066, now seen corresponding path program 5 times [2020-08-19 02:05:05,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:05,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1073079252] [2020-08-19 02:05:05,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:05,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:05,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,854 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:05,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1073079252] [2020-08-19 02:05:05,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:05,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 02:05:05,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598421028] [2020-08-19 02:05:05,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 02:05:05,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:05,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 02:05:05,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-08-19 02:05:05,857 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-19 02:05:05,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:05,906 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-19 02:05:05,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 02:05:05,907 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-19 02:05:05,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:05,908 INFO L225 Difference]: With dead ends: 29 [2020-08-19 02:05:05,908 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 02:05:05,909 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-08-19 02:05:05,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 02:05:05,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-19 02:05:05,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 02:05:05,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 02:05:05,915 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-19 02:05:05,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:05,916 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 02:05:05,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 02:05:05,916 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 02:05:05,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 02:05:05,917 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:05,917 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:05,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 02:05:05,918 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:05,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:05,918 INFO L82 PathProgramCache]: Analyzing trace with hash -241172304, now seen corresponding path program 6 times [2020-08-19 02:05:05,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:05,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1508586881] [2020-08-19 02:05:05,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:05,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:06,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:06,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:06,036 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:06,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1508586881] [2020-08-19 02:05:06,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:06,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 02:05:06,037 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499096463] [2020-08-19 02:05:06,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 02:05:06,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:06,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 02:05:06,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-08-19 02:05:06,039 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-19 02:05:06,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:06,099 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-19 02:05:06,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 02:05:06,100 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-19 02:05:06,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:06,101 INFO L225 Difference]: With dead ends: 31 [2020-08-19 02:05:06,101 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 02:05:06,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-08-19 02:05:06,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 02:05:06,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-19 02:05:06,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 02:05:06,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-19 02:05:06,117 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-19 02:05:06,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:06,118 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-19 02:05:06,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 02:05:06,118 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-19 02:05:06,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 02:05:06,121 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:06,121 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:06,122 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 02:05:06,122 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:06,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:06,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1326563246, now seen corresponding path program 7 times [2020-08-19 02:05:06,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:06,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1352837222] [2020-08-19 02:05:06,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:06,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:06,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:06,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:06,271 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:06,272 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1352837222] [2020-08-19 02:05:06,272 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:06,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 02:05:06,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541259178] [2020-08-19 02:05:06,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 02:05:06,273 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:06,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 02:05:06,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:05:06,274 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-19 02:05:06,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:06,315 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 02:05:06,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 02:05:06,315 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-19 02:05:06,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:06,316 INFO L225 Difference]: With dead ends: 32 [2020-08-19 02:05:06,317 INFO L226 Difference]: Without dead ends: 27 [2020-08-19 02:05:06,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:05:06,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-19 02:05:06,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-19 02:05:06,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 02:05:06,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-19 02:05:06,322 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-19 02:05:06,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:06,323 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-19 02:05:06,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 02:05:06,323 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-19 02:05:06,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 02:05:06,324 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:06,324 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:06,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 02:05:06,324 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:06,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:06,325 INFO L82 PathProgramCache]: Analyzing trace with hash 386905900, now seen corresponding path program 8 times [2020-08-19 02:05:06,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:06,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [928500409] [2020-08-19 02:05:06,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:06,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:06,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:06,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:06,552 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:06,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [928500409] [2020-08-19 02:05:06,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:06,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 02:05:06,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126749271] [2020-08-19 02:05:06,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 02:05:06,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:06,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 02:05:06,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-19 02:05:06,555 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 13 states. [2020-08-19 02:05:06,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:06,663 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-19 02:05:06,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 02:05:06,663 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 26 [2020-08-19 02:05:06,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:06,664 INFO L225 Difference]: With dead ends: 34 [2020-08-19 02:05:06,665 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 02:05:06,665 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2020-08-19 02:05:06,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 02:05:06,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 02:05:06,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 02:05:06,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 02:05:06,671 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-19 02:05:06,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:06,672 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 02:05:06,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 02:05:06,672 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 02:05:06,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 02:05:06,673 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:06,673 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:06,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 02:05:06,674 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:06,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:06,674 INFO L82 PathProgramCache]: Analyzing trace with hash -680671446, now seen corresponding path program 9 times [2020-08-19 02:05:06,674 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:06,675 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [254382136] [2020-08-19 02:05:06,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:06,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:06,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:06,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:06,810 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:06,810 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [254382136] [2020-08-19 02:05:06,811 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:05:06,811 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-08-19 02:05:06,811 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017856011] [2020-08-19 02:05:06,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 02:05:06,813 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:06,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 02:05:06,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-08-19 02:05:06,814 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 11 states. [2020-08-19 02:05:06,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:06,881 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-19 02:05:06,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 02:05:06,882 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2020-08-19 02:05:06,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:06,883 INFO L225 Difference]: With dead ends: 29 [2020-08-19 02:05:06,883 INFO L226 Difference]: Without dead ends: 0 [2020-08-19 02:05:06,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-08-19 02:05:06,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-19 02:05:06,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-19 02:05:06,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-19 02:05:06,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-19 02:05:06,885 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 28 [2020-08-19 02:05:06,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:06,886 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-19 02:05:06,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 02:05:06,886 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-19 02:05:06,886 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-19 02:05:06,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 02:05:06,890 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-19 02:05:07,052 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-19 02:05:07,052 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-19 02:05:07,053 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-19 02:05:07,053 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-19 02:05:07,053 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-19 02:05:07,053 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-19 02:05:07,053 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 11 17) the Hoare annotation is: true [2020-08-19 02:05:07,053 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 11 17) no Hoare annotation was computed. [2020-08-19 02:05:07,054 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 11 17) no Hoare annotation was computed. [2020-08-19 02:05:07,054 INFO L268 CegarLoopResult]: For program point L13-2(lines 13 15) no Hoare annotation was computed. [2020-08-19 02:05:07,056 INFO L264 CegarLoopResult]: At program point L13-3(lines 13 15) the Hoare annotation is: (or (and (<= main_~i~0 4) (<= 6 main_~sn~0) (<= 4 main_~i~0) (<= main_~sn~0 6)) (and (<= 0 main_~sn~0) (<= 1 main_~i~0) (<= main_~sn~0 0) (<= main_~i~0 1)) (and (<= 7 main_~i~0) (<= main_~i~0 7) (<= 12 main_~sn~0) (<= main_~sn~0 12)) (and (<= main_~sn~0 4) (<= 3 main_~i~0) (<= main_~i~0 3) (<= 4 main_~sn~0)) (and (<= main_~i~0 6) (<= 10 main_~sn~0) (<= main_~sn~0 10) (<= 6 main_~i~0)) (and (<= 9 main_~i~0) (<= main_~sn~0 16) (< 15 main_~sn~0)) (and (<= 2 main_~i~0) (<= main_~sn~0 2) (<= 2 main_~sn~0) (<= main_~i~0 2)) (and (<= main_~sn~0 8) (<= 5 main_~i~0) (<= main_~i~0 5) (<= 8 main_~sn~0)) (and (<= main_~i~0 8) (<= 8 main_~i~0) (<= main_~sn~0 14) (<= 14 main_~sn~0))) [2020-08-19 02:05:07,056 INFO L264 CegarLoopResult]: At program point L13-4(lines 13 15) the Hoare annotation is: (and (<= main_~sn~0 16) (< 15 main_~sn~0)) [2020-08-19 02:05:07,056 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2020-08-19 02:05:07,056 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2020-08-19 02:05:07,056 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-08-19 02:05:07,057 INFO L268 CegarLoopResult]: For program point L4(lines 4 6) no Hoare annotation was computed. [2020-08-19 02:05:07,057 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2020-08-19 02:05:07,057 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2020-08-19 02:05:07,087 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.08 02:05:07 BoogieIcfgContainer [2020-08-19 02:05:07,088 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-19 02:05:07,091 INFO L168 Benchmark]: Toolchain (without parser) took 2933.84 ms. Allocated memory was 140.0 MB in the beginning and 236.5 MB in the end (delta: 96.5 MB). Free memory was 103.2 MB in the beginning and 100.8 MB in the end (delta: 2.4 MB). Peak memory consumption was 98.9 MB. Max. memory is 7.1 GB. [2020-08-19 02:05:07,092 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-19 02:05:07,092 INFO L168 Benchmark]: CACSL2BoogieTranslator took 288.02 ms. Allocated memory is still 140.0 MB. Free memory was 103.0 MB in the beginning and 93.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-19 02:05:07,094 INFO L168 Benchmark]: Boogie Preprocessor took 109.45 ms. Allocated memory was 140.0 MB in the beginning and 202.4 MB in the end (delta: 62.4 MB). Free memory was 93.7 MB in the beginning and 181.4 MB in the end (delta: -87.7 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2020-08-19 02:05:07,094 INFO L168 Benchmark]: RCFGBuilder took 246.55 ms. Allocated memory is still 202.4 MB. Free memory was 181.4 MB in the beginning and 169.3 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. [2020-08-19 02:05:07,095 INFO L168 Benchmark]: TraceAbstraction took 2285.65 ms. Allocated memory was 202.4 MB in the beginning and 236.5 MB in the end (delta: 34.1 MB). Free memory was 169.3 MB in the beginning and 100.8 MB in the end (delta: 68.6 MB). Peak memory consumption was 102.7 MB. Max. memory is 7.1 GB. [2020-08-19 02:05:07,100 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 288.02 ms. Allocated memory is still 140.0 MB. Free memory was 103.0 MB in the beginning and 93.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 109.45 ms. Allocated memory was 140.0 MB in the beginning and 202.4 MB in the end (delta: 62.4 MB). Free memory was 93.7 MB in the beginning and 181.4 MB in the end (delta: -87.7 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 246.55 ms. Allocated memory is still 202.4 MB. Free memory was 181.4 MB in the beginning and 169.3 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2285.65 ms. Allocated memory was 202.4 MB in the beginning and 236.5 MB in the end (delta: 34.1 MB). Free memory was 169.3 MB in the beginning and 100.8 MB in the end (delta: 68.6 MB). Peak memory consumption was 102.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: 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: 13]: Loop Invariant Derived loop invariant: ((((((((((i <= 4 && 6 <= sn) && 4 <= i) && sn <= 6) || (((0 <= sn && 1 <= i) && sn <= 0) && i <= 1)) || (((7 <= i && i <= 7) && 12 <= sn) && sn <= 12)) || (((sn <= 4 && 3 <= i) && i <= 3) && 4 <= sn)) || (((i <= 6 && 10 <= sn) && sn <= 10) && 6 <= i)) || ((9 <= i && sn <= 16) && 15 < sn)) || (((2 <= i && sn <= 2) && 2 <= sn) && i <= 2)) || (((sn <= 8 && 5 <= i) && i <= 5) && 8 <= sn)) || (((i <= 8 && 8 <= i) && sn <= 14) && 14 <= sn) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 18 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2.0s, OverallIterations: 11, TraceHistogramMax: 9, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 120 SDtfs, 37 SDslu, 372 SDs, 0 SdLazy, 266 SolverSat, 11 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 101 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=29occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 11 MinimizatonAttempts, 7 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 17 PreInvPairs, 27 NumberOfFragments, 127 HoareAnnotationTreeSize, 17 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 200 NumberOfCodeBlocks, 200 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 189 ConstructedInterpolants, 0 QuantifiedInterpolants, 9803 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 11 InterpolantComputations, 3 PerfectInterpolantSequences, 81/285 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...