/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.4 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum01-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 23:54:56,677 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 23:54:56,680 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 23:54:56,719 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 23:54:56,721 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 23:54:56,731 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 23:54:56,733 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 23:54:56,736 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 23:54:56,739 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 23:54:56,742 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 23:54:56,743 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 23:54:56,745 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 23:54:56,745 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 23:54:56,748 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 23:54:56,751 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 23:54:56,752 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 23:54:56,754 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 23:54:56,756 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 23:54:56,758 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 23:54:56,764 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 23:54:56,767 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 23:54:56,768 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 23:54:56,769 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 23:54:56,770 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 23:54:56,772 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 23:54:56,772 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 23:54:56,772 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 23:54:56,773 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 23:54:56,774 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 23:54:56,775 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 23:54:56,779 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 23:54:56,780 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 23:54:56,780 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 23:54:56,781 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 23:54:56,803 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 23:54:56,803 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 23:54:56,804 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 23:54:56,805 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 23:54:56,805 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 23:54:56,805 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 23:54:56,805 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 23:54:56,805 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 23:54:56,806 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 23:54:56,806 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 23:54:56,806 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 23:54:56,806 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 23:54:56,806 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 23:54:56,807 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 23:54:56,807 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 23:54:56,807 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 23:54:56,807 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 23:54:56,807 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 23:54:56,808 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 23:54:56,808 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 23:54:56,808 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 23:54:56,808 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 23:54:56,809 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 23:54:56,809 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 23:54:56,809 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 23:54:56,809 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 23:54:56,809 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 23:54:56,810 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 23:54:56,810 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 23:54:56,810 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=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; [2020-08-21 23:54:57,133 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 23:54:57,152 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 23:54:57,156 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 23:54:57,159 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 23:54:57,160 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 23:54:57,161 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01-1.i [2020-08-21 23:54:57,236 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/54baeae42/c41837917d074595a0376b41a696164a/FLAG299dd0bc6 [2020-08-21 23:54:57,605 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 23:54:57,606 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/sum01-1.i [2020-08-21 23:54:57,612 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/54baeae42/c41837917d074595a0376b41a696164a/FLAG299dd0bc6 [2020-08-21 23:54:57,991 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/54baeae42/c41837917d074595a0376b41a696164a [2020-08-21 23:54:57,999 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 23:54:58,000 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 23:54:58,001 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 23:54:58,002 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 23:54:58,005 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 23:54:58,006 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:54:57" (1/1) ... [2020-08-21 23:54:58,010 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@31bd816e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:58, skipping insertion in model container [2020-08-21 23:54:58,010 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:54:57" (1/1) ... [2020-08-21 23:54:58,019 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 23:54:58,038 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 23:54:58,198 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:54:58,202 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 23:54:58,218 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:54:58,233 INFO L208 MainTranslator]: Completed translation [2020-08-21 23:54:58,234 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:58 WrapperNode [2020-08-21 23:54:58,234 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 23:54:58,235 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 23:54:58,235 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 23:54:58,235 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 23:54:58,250 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:58" (1/1) ... [2020-08-21 23:54:58,250 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:58" (1/1) ... [2020-08-21 23:54:58,256 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:58" (1/1) ... [2020-08-21 23:54:58,256 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:58" (1/1) ... [2020-08-21 23:54:58,260 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:58" (1/1) ... [2020-08-21 23:54:58,266 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:58" (1/1) ... [2020-08-21 23:54:58,267 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:58" (1/1) ... [2020-08-21 23:54:58,380 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 23:54:58,380 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 23:54:58,381 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 23:54:58,381 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 23:54:58,384 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:58" (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 23:54:58,453 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 23:54:58,454 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 23:54:58,454 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 23:54:58,454 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 23:54:58,454 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 23:54:58,454 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 23:54:58,454 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-21 23:54:58,455 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 23:54:58,455 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 23:54:58,455 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 23:54:58,635 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 23:54:58,635 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 23:54:58,639 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:54:58 BoogieIcfgContainer [2020-08-21 23:54:58,640 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 23:54:58,641 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 23:54:58,641 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 23:54:58,644 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 23:54:58,645 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 11:54:57" (1/3) ... [2020-08-21 23:54:58,646 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ca911bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:54:58, skipping insertion in model container [2020-08-21 23:54:58,646 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:58" (2/3) ... [2020-08-21 23:54:58,646 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ca911bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:54:58, skipping insertion in model container [2020-08-21 23:54:58,646 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:54:58" (3/3) ... [2020-08-21 23:54:58,648 INFO L109 eAbstractionObserver]: Analyzing ICFG sum01-1.i [2020-08-21 23:54:58,659 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 23:54:58,666 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 23:54:58,680 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 23:54:58,704 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 23:54:58,705 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 23:54:58,705 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 23:54:58,705 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 23:54:58,705 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 23:54:58,705 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 23:54:58,706 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 23:54:58,706 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 23:54:58,725 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-21 23:54:58,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 23:54:58,731 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:58,732 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:58,733 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:58,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:58,739 INFO L82 PathProgramCache]: Analyzing trace with hash -721501374, now seen corresponding path program 1 times [2020-08-21 23:54:58,749 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:58,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1857448811] [2020-08-21 23:54:58,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:58,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:58,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:58,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:58,892 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 23:54:58,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1857448811] [2020-08-21 23:54:58,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:54:58,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 23:54:58,896 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831872812] [2020-08-21 23:54:58,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 23:54:58,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:58,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 23:54:58,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 23:54:58,920 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2020-08-21 23:54:58,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:58,942 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-21 23:54:58,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 23:54:58,943 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-21 23:54:58,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:58,952 INFO L225 Difference]: With dead ends: 30 [2020-08-21 23:54:58,952 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 23:54:58,955 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 23:54:58,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 23:54:58,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 23:54:58,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 23:54:58,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-21 23:54:58,990 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-21 23:54:58,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:58,990 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-21 23:54:58,990 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 23:54:58,991 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-21 23:54:58,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 23:54:58,991 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:58,991 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:58,992 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 23:54:58,992 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:58,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:58,993 INFO L82 PathProgramCache]: Analyzing trace with hash -731660105, now seen corresponding path program 1 times [2020-08-21 23:54:58,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:58,993 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1798769497] [2020-08-21 23:54:58,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:59,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:59,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:59,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:59,084 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 23:54:59,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1798769497] [2020-08-21 23:54:59,085 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:54:59,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 23:54:59,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151243112] [2020-08-21 23:54:59,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 23:54:59,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:59,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 23:54:59,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:54:59,088 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-21 23:54:59,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:59,128 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-21 23:54:59,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 23:54:59,129 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-08-21 23:54:59,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:59,131 INFO L225 Difference]: With dead ends: 21 [2020-08-21 23:54:59,131 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 23:54:59,132 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 23:54:59,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 23:54:59,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 23:54:59,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 23:54:59,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 23:54:59,139 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 10 [2020-08-21 23:54:59,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:59,139 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 23:54:59,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 23:54:59,140 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 23:54:59,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 23:54:59,141 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:59,141 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:59,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 23:54:59,142 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:59,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:59,142 INFO L82 PathProgramCache]: Analyzing trace with hash -1637338477, now seen corresponding path program 1 times [2020-08-21 23:54:59,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:59,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1425207920] [2020-08-21 23:54:59,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:59,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:59,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:59,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:59,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:54:59,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1425207920] [2020-08-21 23:54:59,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:59,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 23:54:59,476 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458389637] [2020-08-21 23:54:59,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 23:54:59,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:59,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 23:54:59,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-08-21 23:54:59,477 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 9 states. [2020-08-21 23:54:59,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:59,633 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2020-08-21 23:54:59,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 23:54:59,634 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 13 [2020-08-21 23:54:59,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:59,636 INFO L225 Difference]: With dead ends: 28 [2020-08-21 23:54:59,637 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 23:54:59,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-21 23:54:59,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 23:54:59,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-21 23:54:59,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 23:54:59,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2020-08-21 23:54:59,644 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 13 [2020-08-21 23:54:59,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:59,645 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2020-08-21 23:54:59,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 23:54:59,645 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2020-08-21 23:54:59,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 23:54:59,646 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:59,646 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:59,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 23:54:59,647 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:59,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:59,647 INFO L82 PathProgramCache]: Analyzing trace with hash -2110192267, now seen corresponding path program 1 times [2020-08-21 23:54:59,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:59,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [567181181] [2020-08-21 23:54:59,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:59,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:59,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:59,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:59,696 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 23:54:59,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [567181181] [2020-08-21 23:54:59,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:54:59,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 23:54:59,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328252569] [2020-08-21 23:54:59,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 23:54:59,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:59,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 23:54:59,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 23:54:59,700 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand 3 states. [2020-08-21 23:54:59,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:59,728 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2020-08-21 23:54:59,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 23:54:59,729 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-08-21 23:54:59,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:59,730 INFO L225 Difference]: With dead ends: 28 [2020-08-21 23:54:59,730 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 23:54:59,731 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 23:54:59,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 23:54:59,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 23:54:59,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 23:54:59,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-21 23:54:59,737 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 16 [2020-08-21 23:54:59,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:59,737 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-21 23:54:59,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 23:54:59,738 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-21 23:54:59,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 23:54:59,739 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:59,739 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:59,739 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 23:54:59,739 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:59,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:59,740 INFO L82 PathProgramCache]: Analyzing trace with hash 57842105, now seen corresponding path program 2 times [2020-08-21 23:54:59,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:59,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [382309068] [2020-08-21 23:54:59,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:59,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:59,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:59,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:59,780 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:54:59,781 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [382309068] [2020-08-21 23:54:59,781 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:59,781 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 23:54:59,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153008506] [2020-08-21 23:54:59,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 23:54:59,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:59,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 23:54:59,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 23:54:59,783 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-21 23:54:59,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:59,815 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2020-08-21 23:54:59,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 23:54:59,816 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-21 23:54:59,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:59,816 INFO L225 Difference]: With dead ends: 27 [2020-08-21 23:54:59,817 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 23:54:59,817 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 23:54:59,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 23:54:59,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2020-08-21 23:54:59,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 23:54:59,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-21 23:54:59,824 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2020-08-21 23:54:59,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:59,824 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-21 23:54:59,824 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 23:54:59,825 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-21 23:54:59,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 23:54:59,825 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:59,825 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:59,826 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 23:54:59,826 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:59,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:59,827 INFO L82 PathProgramCache]: Analyzing trace with hash -1717165257, now seen corresponding path program 2 times [2020-08-21 23:54:59,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:59,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [140801750] [2020-08-21 23:54:59,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:59,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:55:00,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,064 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 23:55:00,064 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [140801750] [2020-08-21 23:55:00,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:55:00,065 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 23:55:00,065 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601602041] [2020-08-21 23:55:00,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 23:55:00,066 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:55:00,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 23:55:00,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-21 23:55:00,067 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 10 states. [2020-08-21 23:55:00,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:55:00,249 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2020-08-21 23:55:00,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 23:55:00,251 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 16 [2020-08-21 23:55:00,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:55:00,252 INFO L225 Difference]: With dead ends: 27 [2020-08-21 23:55:00,252 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 23:55:00,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2020-08-21 23:55:00,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 23:55:00,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 23:55:00,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 23:55:00,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-21 23:55:00,265 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2020-08-21 23:55:00,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:55:00,265 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-21 23:55:00,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 23:55:00,268 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-21 23:55:00,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 23:55:00,268 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:55:00,269 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:55:00,269 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 23:55:00,269 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:55:00,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:55:00,270 INFO L82 PathProgramCache]: Analyzing trace with hash 1350121109, now seen corresponding path program 3 times [2020-08-21 23:55:00,270 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:55:00,270 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1984086246] [2020-08-21 23:55:00,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:55:00,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:55:00,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,338 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:55:00,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1984086246] [2020-08-21 23:55:00,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:55:00,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 23:55:00,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206596105] [2020-08-21 23:55:00,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 23:55:00,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:55:00,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 23:55:00,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:55:00,341 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 5 states. [2020-08-21 23:55:00,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:55:00,373 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2020-08-21 23:55:00,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 23:55:00,374 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-21 23:55:00,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:55:00,375 INFO L225 Difference]: With dead ends: 33 [2020-08-21 23:55:00,375 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 23:55:00,375 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 23:55:00,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 23:55:00,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2020-08-21 23:55:00,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 23:55:00,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-21 23:55:00,381 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 19 [2020-08-21 23:55:00,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:55:00,382 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-21 23:55:00,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 23:55:00,382 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-21 23:55:00,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 23:55:00,383 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:55:00,383 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:55:00,383 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 23:55:00,384 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:55:00,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:55:00,384 INFO L82 PathProgramCache]: Analyzing trace with hash -452912071, now seen corresponding path program 4 times [2020-08-21 23:55:00,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:55:00,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771492983] [2020-08-21 23:55:00,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:55:00,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:55:00,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,429 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:55:00,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771492983] [2020-08-21 23:55:00,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:55:00,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 23:55:00,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800638048] [2020-08-21 23:55:00,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 23:55:00,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:55:00,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 23:55:00,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:55:00,431 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 6 states. [2020-08-21 23:55:00,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:55:00,466 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-08-21 23:55:00,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 23:55:00,466 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 23:55:00,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:55:00,467 INFO L225 Difference]: With dead ends: 36 [2020-08-21 23:55:00,467 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 23:55:00,468 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 23:55:00,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 23:55:00,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 23:55:00,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 23:55:00,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-08-21 23:55:00,474 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 22 [2020-08-21 23:55:00,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:55:00,474 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-08-21 23:55:00,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 23:55:00,474 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-08-21 23:55:00,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 23:55:00,475 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:55:00,475 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:55:00,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 23:55:00,476 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:55:00,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:55:00,476 INFO L82 PathProgramCache]: Analyzing trace with hash -1753373675, now seen corresponding path program 5 times [2020-08-21 23:55:00,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:55:00,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [728472598] [2020-08-21 23:55:00,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:55:00,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:55:00,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,537 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:55:00,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [728472598] [2020-08-21 23:55:00,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:55:00,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 23:55:00,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318401601] [2020-08-21 23:55:00,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 23:55:00,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:55:00,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 23:55:00,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-08-21 23:55:00,540 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 7 states. [2020-08-21 23:55:00,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:55:00,579 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2020-08-21 23:55:00,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 23:55:00,579 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-08-21 23:55:00,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:55:00,580 INFO L225 Difference]: With dead ends: 39 [2020-08-21 23:55:00,580 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 23:55:00,581 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 [2020-08-21 23:55:00,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 23:55:00,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2020-08-21 23:55:00,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 23:55:00,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-21 23:55:00,586 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2020-08-21 23:55:00,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:55:00,587 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-21 23:55:00,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 23:55:00,587 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-21 23:55:00,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 23:55:00,588 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:55:00,588 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:55:00,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 23:55:00,589 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:55:00,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:55:00,589 INFO L82 PathProgramCache]: Analyzing trace with hash 1094958777, now seen corresponding path program 6 times [2020-08-21 23:55:00,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:55:00,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1999922725] [2020-08-21 23:55:00,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:55:00,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:55:00,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,659 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:55:00,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1999922725] [2020-08-21 23:55:00,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:55:00,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 23:55:00,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449688335] [2020-08-21 23:55:00,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 23:55:00,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:55:00,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 23:55:00,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-08-21 23:55:00,662 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 8 states. [2020-08-21 23:55:00,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:55:00,712 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-08-21 23:55:00,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 23:55:00,713 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 28 [2020-08-21 23:55:00,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:55:00,714 INFO L225 Difference]: With dead ends: 42 [2020-08-21 23:55:00,714 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 23:55:00,715 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 [2020-08-21 23:55:00,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 23:55:00,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 23:55:00,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 23:55:00,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-08-21 23:55:00,721 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 28 [2020-08-21 23:55:00,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:55:00,721 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-08-21 23:55:00,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 23:55:00,722 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-08-21 23:55:00,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 23:55:00,722 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:55:00,723 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:55:00,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 23:55:00,723 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:55:00,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:55:00,724 INFO L82 PathProgramCache]: Analyzing trace with hash 98169237, now seen corresponding path program 7 times [2020-08-21 23:55:00,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:55:00,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [485528896] [2020-08-21 23:55:00,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:55:00,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:55:00,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,798 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:55:00,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [485528896] [2020-08-21 23:55:00,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:55:00,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 23:55:00,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644572982] [2020-08-21 23:55:00,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 23:55:00,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:55:00,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 23:55:00,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-08-21 23:55:00,801 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 9 states. [2020-08-21 23:55:00,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:55:00,856 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2020-08-21 23:55:00,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 23:55:00,857 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-21 23:55:00,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:55:00,858 INFO L225 Difference]: With dead ends: 45 [2020-08-21 23:55:00,858 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 23:55:00,859 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 [2020-08-21 23:55:00,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 23:55:00,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2020-08-21 23:55:00,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 23:55:00,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-21 23:55:00,865 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2020-08-21 23:55:00,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:55:00,866 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-21 23:55:00,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 23:55:00,866 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-21 23:55:00,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 23:55:00,867 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:55:00,867 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:55:00,868 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 23:55:00,868 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:55:00,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:55:00,868 INFO L82 PathProgramCache]: Analyzing trace with hash 144867641, now seen corresponding path program 8 times [2020-08-21 23:55:00,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:55:00,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529012562] [2020-08-21 23:55:00,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:55:00,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:55:00,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,965 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 15 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:55:00,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529012562] [2020-08-21 23:55:00,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:55:00,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 23:55:00,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938790571] [2020-08-21 23:55:00,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 23:55:00,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:55:00,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 23:55:00,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-08-21 23:55:00,968 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 10 states. [2020-08-21 23:55:01,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:55:01,018 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2020-08-21 23:55:01,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 23:55:01,019 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 34 [2020-08-21 23:55:01,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:55:01,020 INFO L225 Difference]: With dead ends: 48 [2020-08-21 23:55:01,020 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 23:55:01,021 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 [2020-08-21 23:55:01,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 23:55:01,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 23:55:01,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 23:55:01,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2020-08-21 23:55:01,026 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 34 [2020-08-21 23:55:01,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:55:01,027 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2020-08-21 23:55:01,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 23:55:01,027 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2020-08-21 23:55:01,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 23:55:01,028 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:55:01,028 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:55:01,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 23:55:01,029 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:55:01,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:55:01,029 INFO L82 PathProgramCache]: Analyzing trace with hash -232382699, now seen corresponding path program 9 times [2020-08-21 23:55:01,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:55:01,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1415935135] [2020-08-21 23:55:01,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:55:01,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:01,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:55:01,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:01,140 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 17 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:55:01,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1415935135] [2020-08-21 23:55:01,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:55:01,141 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 23:55:01,141 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635736840] [2020-08-21 23:55:01,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 23:55:01,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:55:01,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 23:55:01,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-08-21 23:55:01,143 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 11 states. [2020-08-21 23:55:01,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:55:01,198 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2020-08-21 23:55:01,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 23:55:01,199 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 37 [2020-08-21 23:55:01,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:55:01,200 INFO L225 Difference]: With dead ends: 51 [2020-08-21 23:55:01,200 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 23:55:01,200 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 [2020-08-21 23:55:01,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 23:55:01,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2020-08-21 23:55:01,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 23:55:01,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-21 23:55:01,206 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 37 [2020-08-21 23:55:01,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:55:01,206 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-21 23:55:01,206 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 23:55:01,206 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-21 23:55:01,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 23:55:01,207 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:55:01,207 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:55:01,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 23:55:01,208 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:55:01,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:55:01,208 INFO L82 PathProgramCache]: Analyzing trace with hash 1032151993, now seen corresponding path program 10 times [2020-08-21 23:55:01,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:55:01,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1982412962] [2020-08-21 23:55:01,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:55:01,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 23:55:01,224 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 23:55:01,224 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 23:55:01,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 23:55:01,246 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 11:55:01 BoogieIcfgContainer [2020-08-21 23:55:01,247 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 23:55:01,249 INFO L168 Benchmark]: Toolchain (without parser) took 3248.01 ms. Allocated memory was 140.5 MB in the beginning and 243.3 MB in the end (delta: 102.8 MB). Free memory was 103.8 MB in the beginning and 168.3 MB in the end (delta: -64.5 MB). Peak memory consumption was 38.3 MB. Max. memory is 7.1 GB. [2020-08-21 23:55:01,250 INFO L168 Benchmark]: CDTParser took 0.76 ms. Allocated memory is still 140.5 MB. Free memory was 122.1 MB in the beginning and 121.6 MB in the end (delta: 419.7 kB). Peak memory consumption was 419.7 kB. Max. memory is 7.1 GB. [2020-08-21 23:55:01,251 INFO L168 Benchmark]: CACSL2BoogieTranslator took 232.73 ms. Allocated memory is still 140.5 MB. Free memory was 103.8 MB in the beginning and 94.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-21 23:55:01,252 INFO L168 Benchmark]: Boogie Preprocessor took 145.41 ms. Allocated memory was 140.5 MB in the beginning and 206.0 MB in the end (delta: 65.5 MB). Free memory was 94.5 MB in the beginning and 185.8 MB in the end (delta: -91.3 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. [2020-08-21 23:55:01,252 INFO L168 Benchmark]: RCFGBuilder took 259.34 ms. Allocated memory is still 206.0 MB. Free memory was 185.8 MB in the beginning and 173.0 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-21 23:55:01,253 INFO L168 Benchmark]: TraceAbstraction took 2605.83 ms. Allocated memory was 206.0 MB in the beginning and 243.3 MB in the end (delta: 37.2 MB). Free memory was 173.0 MB in the beginning and 168.3 MB in the end (delta: 4.7 MB). Peak memory consumption was 41.9 MB. Max. memory is 7.1 GB. [2020-08-21 23:55:01,256 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.76 ms. Allocated memory is still 140.5 MB. Free memory was 122.1 MB in the beginning and 121.6 MB in the end (delta: 419.7 kB). Peak memory consumption was 419.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 232.73 ms. Allocated memory is still 140.5 MB. Free memory was 103.8 MB in the beginning and 94.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 145.41 ms. Allocated memory was 140.5 MB in the beginning and 206.0 MB in the end (delta: 65.5 MB). Free memory was 94.5 MB in the beginning and 185.8 MB in the end (delta: -91.3 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 259.34 ms. Allocated memory is still 206.0 MB. Free memory was 185.8 MB in the beginning and 173.0 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2605.83 ms. Allocated memory was 206.0 MB in the beginning and 243.3 MB in the end (delta: 37.2 MB). Free memory was 173.0 MB in the beginning and 168.3 MB in the end (delta: 4.7 MB). Peak memory consumption was 41.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int i, n=__VERIFIER_nondet_uint(), sn=0; [L12] int i, n=__VERIFIER_nondet_uint(), sn=0; [L13] i=1 [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND FALSE !(i<10) [L13] i++ [L13] COND FALSE !(i<=n) [L17] CALL __VERIFIER_assert(sn==n*(2) || sn == 0) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.5s, OverallIterations: 14, TraceHistogramMax: 10, AutomataDifference: 0.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 147 SDtfs, 59 SDslu, 484 SDs, 0 SdLazy, 391 SolverSat, 15 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 124 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=13, 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, 13 MinimizatonAttempts, 12 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.1s InterpolantComputationTime, 317 NumberOfCodeBlocks, 317 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 264 ConstructedInterpolants, 0 QuantifiedInterpolants, 16404 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 13 InterpolantComputations, 3 PerfectInterpolantSequences, 86/415 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 incorrect! Received shutdown request...