/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops/sum04-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 23:15:24,874 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 23:15:24,876 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 23:15:24,929 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 23:15:25,030 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 23:15:25,033 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 23:15:25,034 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 23:15:25,038 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-02 23:15:25,049 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 23:15:25,049 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 23:15:25,051 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 23:15:25,051 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 23:15:25,051 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 23:15:25,051 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 23:15:25,051 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 23:15:25,051 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 23:15:25,051 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 23:15:25,052 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 23:15:25,052 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 23:15:25,052 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 23:15:25,052 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 23:15:25,052 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 23:15:25,052 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 23:15:25,053 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 23:15:25,053 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 23:15:25,053 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 23:15:25,053 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 23:15:25,053 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 23:15:25,053 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-02 23:15:25,054 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 23:15:25,054 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-02 23:15:25,054 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 23:15:25,403 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 23:15:25,440 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 23:15:25,443 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 23:15:25,444 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 23:15:25,445 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 23:15:25,446 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum04-1.i [2021-05-02 23:15:25,537 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a82f58b0/7f03b1d50b2e47349225b0295c2de88e/FLAG5e5d1f3a2 [2021-05-02 23:15:26,104 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 23:15:26,105 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04-1.i [2021-05-02 23:15:26,112 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a82f58b0/7f03b1d50b2e47349225b0295c2de88e/FLAG5e5d1f3a2 [2021-05-02 23:15:26,538 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a82f58b0/7f03b1d50b2e47349225b0295c2de88e [2021-05-02 23:15:26,543 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 23:15:26,545 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 23:15:26,547 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 23:15:26,547 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 23:15:26,552 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 23:15:26,553 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:15:26" (1/1) ... [2021-05-02 23:15:26,554 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c8498dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:15:26, skipping insertion in model container [2021-05-02 23:15:26,555 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:15:26" (1/1) ... [2021-05-02 23:15:26,565 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 23:15:26,582 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 23:15:26,723 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04-1.i[808,821] [2021-05-02 23:15:26,737 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:15:26,750 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 23:15:26,792 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04-1.i[808,821] [2021-05-02 23:15:26,794 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:15:26,831 INFO L208 MainTranslator]: Completed translation [2021-05-02 23:15:26,834 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:15:26 WrapperNode [2021-05-02 23:15:26,834 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 23:15:26,837 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 23:15:26,837 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 23:15:26,837 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 23:15:26,848 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:15:26" (1/1) ... [2021-05-02 23:15:26,848 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:15:26" (1/1) ... [2021-05-02 23:15:26,855 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:15:26" (1/1) ... [2021-05-02 23:15:26,856 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:15:26" (1/1) ... [2021-05-02 23:15:26,862 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:15:26" (1/1) ... [2021-05-02 23:15:26,868 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:15:26" (1/1) ... [2021-05-02 23:15:26,878 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:15:26" (1/1) ... [2021-05-02 23:15:26,881 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 23:15:26,884 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 23:15:26,884 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 23:15:26,884 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 23:15:26,885 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:15:26" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2021-05-02 23:15:26,974 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 23:15:26,975 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 23:15:26,975 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 23:15:26,975 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 23:15:26,976 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 23:15:26,976 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 23:15:26,976 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 23:15:26,976 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 23:15:26,976 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 23:15:26,976 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 23:15:26,976 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 23:15:26,976 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 23:15:26,977 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 23:15:26,977 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 23:15:26,977 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 23:15:26,977 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 23:15:26,977 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 23:15:26,978 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 23:15:26,978 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 23:15:27,294 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 23:15:27,294 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 23:15:27,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:15:27 BoogieIcfgContainer [2021-05-02 23:15:27,313 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 23:15:27,315 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 23:15:27,315 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 23:15:27,318 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 23:15:27,319 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:15:26" (1/3) ... [2021-05-02 23:15:27,320 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@592e7c8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:15:27, skipping insertion in model container [2021-05-02 23:15:27,320 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:15:26" (2/3) ... [2021-05-02 23:15:27,320 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@592e7c8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:15:27, skipping insertion in model container [2021-05-02 23:15:27,320 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:15:27" (3/3) ... [2021-05-02 23:15:27,322 INFO L111 eAbstractionObserver]: Analyzing ICFG sum04-1.i [2021-05-02 23:15:27,328 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-02 23:15:27,332 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 23:15:27,350 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 23:15:27,370 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 23:15:27,370 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 23:15:27,370 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-02 23:15:27,370 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 23:15:27,370 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 23:15:27,371 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 23:15:27,371 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 23:15:27,371 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 23:15:27,401 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:15:27,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 23:15:27,408 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:15:27,408 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:15:27,409 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:15:27,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:15:27,431 INFO L82 PathProgramCache]: Analyzing trace with hash 1466806487, now seen corresponding path program 1 times [2021-05-02 23:15:27,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:15:27,440 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [199414791] [2021-05-02 23:15:27,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:15:27,512 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:15:27,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:27,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:15:27,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:27,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:15:27,767 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:15:27,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [199414791] [2021-05-02 23:15:27,770 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [199414791] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:15:27,770 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:15:27,770 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 23:15:27,771 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007614095] [2021-05-02 23:15:27,782 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 23:15:27,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:15:27,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 23:15:27,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 23:15:27,799 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:27,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:15:27,904 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 23:15:27,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 23:15:27,906 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 23:15:27,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:15:27,913 INFO L225 Difference]: With dead ends: 31 [2021-05-02 23:15:27,913 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 23:15:27,917 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 85.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 23:15:27,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 23:15:27,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 23:15:27,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:27,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 23:15:27,964 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 23:15:27,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:15:27,965 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 23:15:27,965 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:27,965 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 23:15:27,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 23:15:27,966 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:15:27,966 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:15:27,966 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 23:15:27,967 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:15:27,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:15:27,967 INFO L82 PathProgramCache]: Analyzing trace with hash 1456647756, now seen corresponding path program 1 times [2021-05-02 23:15:27,968 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:15:27,968 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638173449] [2021-05-02 23:15:27,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:15:27,980 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:15:27,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:28,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:15:28,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:28,113 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:15:28,114 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:15:28,114 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638173449] [2021-05-02 23:15:28,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [638173449] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:15:28,114 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:15:28,114 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 23:15:28,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916458493] [2021-05-02 23:15:28,116 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 23:15:28,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:15:28,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 23:15:28,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 23:15:28,117 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:28,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:15:28,201 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2021-05-02 23:15:28,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 23:15:28,203 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 23:15:28,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:15:28,204 INFO L225 Difference]: With dead ends: 25 [2021-05-02 23:15:28,204 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 23:15:28,205 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 82.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 23:15:28,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 23:15:28,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 23:15:28,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:28,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-02 23:15:28,214 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-05-02 23:15:28,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:15:28,214 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-02 23:15:28,214 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:28,215 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-02 23:15:28,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 23:15:28,215 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:15:28,215 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:15:28,215 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 23:15:28,216 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:15:28,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:15:28,216 INFO L82 PathProgramCache]: Analyzing trace with hash 193151625, now seen corresponding path program 1 times [2021-05-02 23:15:28,217 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:15:28,217 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [442917961] [2021-05-02 23:15:28,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:15:28,272 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_11 4) InVars {main_~i~0=v_main_~i~0_11} OutVars{main_~i~0=v_main_~i~0_11} AuxVars[] AssignedVars[] [2021-05-02 23:15:28,312 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.4 percent of original size [2021-05-02 23:15:28,323 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:28,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:15:28,418 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.4 percent of original size 57 [2021-05-02 23:15:28,444 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:15:28,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:28,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:15:28,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:28,563 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:15:28,627 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:15:28,628 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [442917961] [2021-05-02 23:15:28,628 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [442917961] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:15:28,628 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:15:28,628 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 23:15:28,628 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25482481] [2021-05-02 23:15:28,629 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 23:15:28,629 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:15:28,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 23:15:28,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-02 23:15:28,630 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:28,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:15:28,754 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-05-02 23:15:28,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 23:15:28,755 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 23:15:28,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:15:28,755 INFO L225 Difference]: With dead ends: 28 [2021-05-02 23:15:28,755 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 23:15:28,756 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 115.2ms TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-05-02 23:15:28,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 23:15:28,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-02 23:15:28,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:28,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 23:15:28,764 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 23:15:28,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:15:28,764 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 23:15:28,764 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:28,764 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 23:15:28,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 23:15:28,765 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:15:28,765 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:15:28,765 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 23:15:28,766 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:15:28,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:15:28,766 INFO L82 PathProgramCache]: Analyzing trace with hash 473295148, now seen corresponding path program 2 times [2021-05-02 23:15:28,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:15:28,767 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1562473293] [2021-05-02 23:15:28,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:15:28,786 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (<= v_main_~i~0_15 7) (< v_main_~i~0_15 4)) InVars {main_~i~0=v_main_~i~0_15} OutVars{main_~i~0=v_main_~i~0_15} AuxVars[] AssignedVars[] [2021-05-02 23:15:28,802 WARN L240 tifierPushTermWalker]: treesize reduction 25, result has 69.5 percent of original size [2021-05-02 23:15:28,836 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:28,850 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:15:28,870 WARN L245 tifierPushTermWalker]: treesize reduction 25, result has 69.5 percent of original size 57 [2021-05-02 23:15:28,893 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:15:28,899 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_17 4) InVars {main_~i~0=v_main_~i~0_17} OutVars{main_~i~0=v_main_~i~0_17} AuxVars[] AssignedVars[] [2021-05-02 23:15:28,916 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.4 percent of original size [2021-05-02 23:15:28,921 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:28,933 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:15:28,965 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.4 percent of original size 57 [2021-05-02 23:15:28,986 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:15:29,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:29,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:15:29,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:29,104 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:15:29,169 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:15:29,170 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1562473293] [2021-05-02 23:15:29,171 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1562473293] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:15:29,171 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:15:29,171 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 23:15:29,173 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170306936] [2021-05-02 23:15:29,174 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 23:15:29,174 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:15:29,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 23:15:29,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 23:15:29,175 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:29,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:15:29,388 INFO L93 Difference]: Finished difference Result 37 states and 45 transitions. [2021-05-02 23:15:29,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 23:15:29,389 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 23:15:29,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:15:29,390 INFO L225 Difference]: With dead ends: 37 [2021-05-02 23:15:29,390 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 23:15:29,390 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 166.5ms TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2021-05-02 23:15:29,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 23:15:29,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2021-05-02 23:15:29,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:29,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-02 23:15:29,398 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2021-05-02 23:15:29,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:15:29,398 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-02 23:15:29,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:29,399 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-02 23:15:29,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 23:15:29,399 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:15:29,400 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:15:29,400 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 23:15:29,400 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:15:29,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:15:29,401 INFO L82 PathProgramCache]: Analyzing trace with hash -402263410, now seen corresponding path program 1 times [2021-05-02 23:15:29,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:15:29,401 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1977393930] [2021-05-02 23:15:29,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:15:29,414 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (<= v_main_~i~0_22 7) (< v_main_~i~0_22 4)) InVars {main_~i~0=v_main_~i~0_22} OutVars{main_~i~0=v_main_~i~0_22} AuxVars[] AssignedVars[] [2021-05-02 23:15:29,420 WARN L240 tifierPushTermWalker]: treesize reduction 25, result has 69.5 percent of original size [2021-05-02 23:15:29,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:29,431 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:15:29,459 WARN L245 tifierPushTermWalker]: treesize reduction 25, result has 69.5 percent of original size 57 [2021-05-02 23:15:29,477 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:15:29,479 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (<= v_main_~i~0_24 8) (<= 4 v_main_~i~0_24)) InVars {main_~i~0=v_main_~i~0_24} OutVars{main_~i~0=v_main_~i~0_24} AuxVars[] AssignedVars[] [2021-05-02 23:15:29,484 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-02 23:15:29,487 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:29,497 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:29,512 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-02 23:15:29,517 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-02 23:15:29,544 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-02 23:15:29,565 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_26 4) InVars {main_~i~0=v_main_~i~0_26} OutVars{main_~i~0=v_main_~i~0_26} AuxVars[] AssignedVars[] [2021-05-02 23:15:29,569 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.4 percent of original size [2021-05-02 23:15:29,572 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:29,580 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:15:29,604 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.4 percent of original size 57 [2021-05-02 23:15:29,620 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-02 23:15:29,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:29,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:15:29,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:29,680 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:15:29,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 23:15:29,743 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:15:29,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1977393930] [2021-05-02 23:15:29,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1977393930] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:15:29,744 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:15:29,744 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 23:15:29,744 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130165085] [2021-05-02 23:15:29,745 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 23:15:29,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:15:29,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 23:15:29,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:15:29,746 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:29,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:15:29,922 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2021-05-02 23:15:29,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 23:15:29,922 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 23:15:29,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:15:29,923 INFO L225 Difference]: With dead ends: 46 [2021-05-02 23:15:29,923 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 23:15:29,924 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 153.3ms TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-05-02 23:15:29,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 23:15:29,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-05-02 23:15:29,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:29,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2021-05-02 23:15:29,932 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 23 [2021-05-02 23:15:29,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:15:29,932 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2021-05-02 23:15:29,932 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:29,932 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2021-05-02 23:15:29,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 23:15:29,933 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:15:29,933 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:15:29,933 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 23:15:29,933 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:15:29,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:15:29,934 INFO L82 PathProgramCache]: Analyzing trace with hash -1841039991, now seen corresponding path program 2 times [2021-05-02 23:15:29,934 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:15:29,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [738085314] [2021-05-02 23:15:29,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:15:29,949 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (<= v_main_~i~0_34 7) (< v_main_~i~0_34 4)) InVars {main_~i~0=v_main_~i~0_34} OutVars{main_~i~0=v_main_~i~0_34} AuxVars[] AssignedVars[] [2021-05-02 23:15:29,953 WARN L240 tifierPushTermWalker]: treesize reduction 25, result has 69.5 percent of original size [2021-05-02 23:15:29,956 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:29,965 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:15:29,992 WARN L245 tifierPushTermWalker]: treesize reduction 25, result has 69.5 percent of original size 57 [2021-05-02 23:15:30,014 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (<= 4 v_main_~i~0_36) (<= v_main_~i~0_36 7)) InVars {main_~i~0=v_main_~i~0_36} OutVars{main_~i~0=v_main_~i~0_36} AuxVars[] AssignedVars[] [2021-05-02 23:15:30,019 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-02 23:15:30,043 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:30,046 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:30,061 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-02 23:15:30,064 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-02 23:15:30,077 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-02 23:15:30,096 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-02 23:15:30,099 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (<= 4 v_main_~i~0_38) (<= v_main_~i~0_38 8)) InVars {main_~i~0=v_main_~i~0_38} OutVars{main_~i~0=v_main_~i~0_38} AuxVars[] AssignedVars[] [2021-05-02 23:15:30,103 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-02 23:15:30,120 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:30,126 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:30,140 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-02 23:15:30,143 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-02 23:15:30,159 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-02 23:15:30,217 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_40 4) InVars {main_~i~0=v_main_~i~0_40} OutVars{main_~i~0=v_main_~i~0_40} AuxVars[] AssignedVars[] [2021-05-02 23:15:30,221 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.4 percent of original size [2021-05-02 23:15:30,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:30,245 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:15:30,260 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.4 percent of original size 57 [2021-05-02 23:15:30,308 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-02 23:15:30,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:30,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:15:30,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:30,369 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:15:30,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 23:15:30,480 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:15:30,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [738085314] [2021-05-02 23:15:30,480 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [738085314] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:15:30,480 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:15:30,480 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 23:15:30,480 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049964094] [2021-05-02 23:15:30,481 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 23:15:30,481 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:15:30,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 23:15:30,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 23:15:30,482 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:30,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:15:30,798 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2021-05-02 23:15:30,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 23:15:30,799 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 23:15:30,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:15:30,799 INFO L225 Difference]: With dead ends: 40 [2021-05-02 23:15:30,800 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 23:15:30,800 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 284.4ms TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-02 23:15:30,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 23:15:30,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-02 23:15:30,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:30,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-05-02 23:15:30,808 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 26 [2021-05-02 23:15:30,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:15:30,808 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-05-02 23:15:30,808 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:30,808 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-05-02 23:15:30,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 23:15:30,809 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:15:30,809 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:15:30,810 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-02 23:15:30,810 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:15:30,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:15:30,810 INFO L82 PathProgramCache]: Analyzing trace with hash -660550482, now seen corresponding path program 3 times [2021-05-02 23:15:30,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:15:30,811 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [373532055] [2021-05-02 23:15:30,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:15:30,822 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (< v_main_~i~0_49 4) (<= v_main_~i~0_49 7)) InVars {main_~i~0=v_main_~i~0_49} OutVars{main_~i~0=v_main_~i~0_49} AuxVars[] AssignedVars[] [2021-05-02 23:15:30,825 WARN L240 tifierPushTermWalker]: treesize reduction 25, result has 69.5 percent of original size [2021-05-02 23:15:30,827 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:30,836 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:15:30,867 WARN L245 tifierPushTermWalker]: treesize reduction 25, result has 69.5 percent of original size 57 [2021-05-02 23:15:30,887 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (<= v_main_~i~0_51 7) (<= 4 v_main_~i~0_51)) InVars {main_~i~0=v_main_~i~0_51} OutVars{main_~i~0=v_main_~i~0_51} AuxVars[] AssignedVars[] [2021-05-02 23:15:30,890 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-02 23:15:30,906 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:30,911 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:30,924 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-02 23:15:30,927 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-02 23:15:30,941 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-02 23:15:30,959 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-02 23:15:30,963 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (<= 4 v_main_~i~0_53) (<= v_main_~i~0_53 8)) InVars {main_~i~0=v_main_~i~0_53} OutVars{main_~i~0=v_main_~i~0_53} AuxVars[] AssignedVars[] [2021-05-02 23:15:30,966 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-02 23:15:30,968 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:30,975 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:30,991 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-02 23:15:30,994 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-02 23:15:31,031 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-02 23:15:31,051 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_55 4) InVars {main_~i~0=v_main_~i~0_55} OutVars{main_~i~0=v_main_~i~0_55} AuxVars[] AssignedVars[] [2021-05-02 23:15:31,055 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.4 percent of original size [2021-05-02 23:15:31,057 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:31,063 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:15:31,099 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.4 percent of original size 57 [2021-05-02 23:15:31,119 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-02 23:15:31,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:31,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:15:31,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:31,214 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:15:31,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 23:15:31,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 23:15:31,422 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:15:31,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [373532055] [2021-05-02 23:15:31,423 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [373532055] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:15:31,423 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:15:31,423 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-02 23:15:31,423 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787674619] [2021-05-02 23:15:31,423 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 23:15:31,423 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:15:31,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 23:15:31,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 23:15:31,425 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:32,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:15:32,012 INFO L93 Difference]: Finished difference Result 43 states and 47 transitions. [2021-05-02 23:15:32,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 23:15:32,013 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 23:15:32,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:15:32,014 INFO L225 Difference]: With dead ends: 43 [2021-05-02 23:15:32,014 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 23:15:32,015 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 484.7ms TimeCoverageRelationStatistics Valid=108, Invalid=704, Unknown=0, NotChecked=0, Total=812 [2021-05-02 23:15:32,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 23:15:32,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-02 23:15:32,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:32,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2021-05-02 23:15:32,024 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 29 [2021-05-02 23:15:32,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:15:32,024 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2021-05-02 23:15:32,024 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:32,024 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2021-05-02 23:15:32,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 23:15:32,025 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:15:32,025 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:15:32,025 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-02 23:15:32,026 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:15:32,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:15:32,026 INFO L82 PathProgramCache]: Analyzing trace with hash 110192489, now seen corresponding path program 4 times [2021-05-02 23:15:32,026 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:15:32,026 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [823306221] [2021-05-02 23:15:32,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:15:32,035 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (< v_main_~i~0_65 4) (<= v_main_~i~0_65 7)) InVars {main_~i~0=v_main_~i~0_65} OutVars{main_~i~0=v_main_~i~0_65} AuxVars[] AssignedVars[] [2021-05-02 23:15:32,039 WARN L240 tifierPushTermWalker]: treesize reduction 25, result has 69.5 percent of original size [2021-05-02 23:15:32,041 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:32,048 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:15:32,076 WARN L245 tifierPushTermWalker]: treesize reduction 25, result has 69.5 percent of original size 57 [2021-05-02 23:15:32,096 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (<= 4 v_main_~i~0_67) (<= v_main_~i~0_67 7)) InVars {main_~i~0=v_main_~i~0_67} OutVars{main_~i~0=v_main_~i~0_67} AuxVars[] AssignedVars[] [2021-05-02 23:15:32,100 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-02 23:15:32,102 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:32,107 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:32,121 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-02 23:15:32,123 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-02 23:15:32,147 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-02 23:15:32,162 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-02 23:15:32,167 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (<= 4 v_main_~i~0_69) (<= v_main_~i~0_69 8)) InVars {main_~i~0=v_main_~i~0_69} OutVars{main_~i~0=v_main_~i~0_69} AuxVars[] AssignedVars[] [2021-05-02 23:15:32,170 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-02 23:15:32,184 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:32,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:32,203 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-02 23:15:32,205 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-02 23:15:32,219 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-02 23:15:32,237 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_71 4) InVars {main_~i~0=v_main_~i~0_71} OutVars{main_~i~0=v_main_~i~0_71} AuxVars[] AssignedVars[] [2021-05-02 23:15:32,240 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.4 percent of original size [2021-05-02 23:15:32,242 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:32,248 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:15:32,270 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.4 percent of original size 57 [2021-05-02 23:15:32,286 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-02 23:15:32,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:32,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:15:32,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:32,351 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:15:32,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 23:15:32,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 23:15:32,588 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:15:32,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [823306221] [2021-05-02 23:15:32,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [823306221] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:15:32,589 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:15:32,589 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-02 23:15:32,589 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104093316] [2021-05-02 23:15:32,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 23:15:32,590 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:15:32,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 23:15:32,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=293, Unknown=0, NotChecked=0, Total=342 [2021-05-02 23:15:32,591 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:33,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:15:33,153 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2021-05-02 23:15:33,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 23:15:33,154 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 23:15:33,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:15:33,155 INFO L225 Difference]: With dead ends: 46 [2021-05-02 23:15:33,155 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 23:15:33,155 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 529.0ms TimeCoverageRelationStatistics Valid=114, Invalid=816, Unknown=0, NotChecked=0, Total=930 [2021-05-02 23:15:33,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 23:15:33,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-05-02 23:15:33,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:33,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2021-05-02 23:15:33,163 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 32 [2021-05-02 23:15:33,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:15:33,163 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2021-05-02 23:15:33,164 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:33,164 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2021-05-02 23:15:33,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 23:15:33,165 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:15:33,165 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:15:33,165 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-02 23:15:33,165 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:15:33,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:15:33,166 INFO L82 PathProgramCache]: Analyzing trace with hash 418877134, now seen corresponding path program 5 times [2021-05-02 23:15:33,166 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:15:33,166 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2091279635] [2021-05-02 23:15:33,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:15:33,176 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (<= v_main_~i~0_82 7) (< v_main_~i~0_82 4)) InVars {main_~i~0=v_main_~i~0_82} OutVars{main_~i~0=v_main_~i~0_82} AuxVars[] AssignedVars[] [2021-05-02 23:15:33,179 WARN L240 tifierPushTermWalker]: treesize reduction 25, result has 69.5 percent of original size [2021-05-02 23:15:33,192 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:33,200 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:15:33,212 WARN L245 tifierPushTermWalker]: treesize reduction 25, result has 69.5 percent of original size 57 [2021-05-02 23:15:33,231 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (<= v_main_~i~0_84 7) (<= 4 v_main_~i~0_84)) InVars {main_~i~0=v_main_~i~0_84} OutVars{main_~i~0=v_main_~i~0_84} AuxVars[] AssignedVars[] [2021-05-02 23:15:33,234 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-02 23:15:33,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:33,241 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:33,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-02 23:15:33,265 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-02 23:15:33,295 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-02 23:15:33,310 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-02 23:15:33,313 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (<= 4 v_main_~i~0_86) (<= v_main_~i~0_86 8)) InVars {main_~i~0=v_main_~i~0_86} OutVars{main_~i~0=v_main_~i~0_86} AuxVars[] AssignedVars[] [2021-05-02 23:15:33,316 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-02 23:15:33,318 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:33,320 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:33,332 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-02 23:15:33,337 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-02 23:15:33,364 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-02 23:15:33,387 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_88 4) InVars {main_~i~0=v_main_~i~0_88} OutVars{main_~i~0=v_main_~i~0_88} AuxVars[] AssignedVars[] [2021-05-02 23:15:33,391 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.4 percent of original size [2021-05-02 23:15:33,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:15:33,400 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:15:33,423 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.4 percent of original size 57 [2021-05-02 23:15:33,438 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-02 23:15:33,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:33,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:15:33,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:15:33,489 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:15:33,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 23:15:33,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 23:15:33,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 23:15:33,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 23:15:33,722 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:15:33,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2091279635] [2021-05-02 23:15:33,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2091279635] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:15:33,722 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:15:33,723 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-02 23:15:33,723 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150437204] [2021-05-02 23:15:33,723 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 23:15:33,723 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:15:33,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 23:15:33,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-05-02 23:15:33,724 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:34,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:15:34,196 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2021-05-02 23:15:34,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 23:15:34,196 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 23:15:34,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:15:34,197 INFO L225 Difference]: With dead ends: 43 [2021-05-02 23:15:34,197 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 23:15:34,198 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 15 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 508.3ms TimeCoverageRelationStatistics Valid=108, Invalid=704, Unknown=0, NotChecked=0, Total=812 [2021-05-02 23:15:34,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 23:15:34,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 23:15:34,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 23:15:34,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 23:15:34,199 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 35 [2021-05-02 23:15:34,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:15:34,199 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 23:15:34,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:15:34,199 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 23:15:34,199 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 23:15:34,200 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-02 23:15:34,202 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-02 23:15:34,469 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 30 [2021-05-02 23:15:34,677 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 32 [2021-05-02 23:15:34,898 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 34 [2021-05-02 23:15:34,902 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 12) no Hoare annotation was computed. [2021-05-02 23:15:34,902 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 12) no Hoare annotation was computed. [2021-05-02 23:15:34,902 INFO L198 CegarLoopUtils]: For program point L12-1(line 12) no Hoare annotation was computed. [2021-05-02 23:15:34,902 INFO L201 CegarLoopUtils]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2021-05-02 23:15:34,902 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string0.offset| |old(#t~string0.offset)|) (= |old(#length)| |#length|) (= |#t~string1.base| |old(#t~string1.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string0.base| |old(#t~string0.base)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|) (= |#t~string1.offset| |old(#t~string1.offset)|)) [2021-05-02 23:15:34,902 INFO L201 CegarLoopUtils]: At program point ULTIMATE.initEXIT(line -1) the Hoare annotation is: true [2021-05-02 23:15:34,903 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startEXIT(line -1) the Hoare annotation is: true [2021-05-02 23:15:34,903 INFO L201 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: true [2021-05-02 23:15:34,903 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-02 23:15:34,903 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startFINAL(line -1) the Hoare annotation is: true [2021-05-02 23:15:34,903 INFO L201 CegarLoopUtils]: At program point mainENTRY(lines 22 29) the Hoare annotation is: true [2021-05-02 23:15:34,903 INFO L194 CegarLoopUtils]: At program point L25(lines 25 26) the Hoare annotation is: (let ((.cse0 (= 6 main_~sn~0))) (or (and (= main_~i~0 8) .cse0) (and (= main_~i~0 4) .cse0) (and (= main_~sn~0 4) (= main_~i~0 3)) (and (= 7 main_~i~0) .cse0) (and (= main_~i~0 2) (= 2 main_~sn~0)) (and (= main_~sn~0 0) (= main_~i~0 1)) (and (= main_~i~0 6) .cse0) (and (= 5 main_~i~0) .cse0))) [2021-05-02 23:15:34,903 INFO L201 CegarLoopUtils]: At program point mainEXIT(lines 22 29) the Hoare annotation is: true [2021-05-02 23:15:34,903 INFO L194 CegarLoopUtils]: At program point L24-2(lines 24 27) the Hoare annotation is: (let ((.cse0 (= 6 main_~sn~0))) (or (and (< main_~i~0 5) (<= 4 main_~i~0) .cse0) (and (= 7 main_~i~0) .cse0) (= main_~i~0 8) (and (= main_~i~0 1) (= 2 main_~sn~0)) (and .cse0 (= main_~i~0 3)) (and (= main_~sn~0 4) (= main_~i~0 2)) (and (= main_~i~0 6) .cse0) (and (= 5 main_~i~0) .cse0))) [2021-05-02 23:15:34,903 INFO L194 CegarLoopUtils]: At program point L24-3(lines 24 27) the Hoare annotation is: (let ((.cse0 (= 6 main_~sn~0))) (or (and (= main_~i~0 8) .cse0) (and (= main_~i~0 4) .cse0) (and (= main_~sn~0 4) (= main_~i~0 3)) (and (= 7 main_~i~0) .cse0) (and (= main_~i~0 2) (= 2 main_~sn~0)) (and (= main_~sn~0 0) (= main_~i~0 1)) (and (= main_~i~0 6) .cse0) (and (= 5 main_~i~0) .cse0) (= main_~i~0 9))) [2021-05-02 23:15:34,904 INFO L194 CegarLoopUtils]: At program point L24-4(lines 24 27) the Hoare annotation is: (= main_~i~0 9) [2021-05-02 23:15:34,904 INFO L201 CegarLoopUtils]: At program point mainFINAL(lines 22 29) the Hoare annotation is: true [2021-05-02 23:15:34,904 INFO L194 CegarLoopUtils]: At program point L16(line 16) the Hoare annotation is: (or (not (= main_~i~0 9)) (and (= __VERIFIER_assert_~cond 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond)) (forall ((v_main_~sn~0_57 Int)) (not (= |__VERIFIER_assert_#in~cond| (ite (or (= 16 v_main_~sn~0_57) (= v_main_~sn~0_57 0)) 1 0))))) [2021-05-02 23:15:34,904 INFO L194 CegarLoopUtils]: At program point L15(lines 15 17) the Hoare annotation is: (or (not (= main_~i~0 9)) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (forall ((v_main_~sn~0_57 Int)) (not (= |__VERIFIER_assert_#in~cond| (ite (or (= 16 v_main_~sn~0_57) (= v_main_~sn~0_57 0)) 1 0))))) [2021-05-02 23:15:34,904 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 14 19) the Hoare annotation is: true [2021-05-02 23:15:34,904 INFO L201 CegarLoopUtils]: At program point L15-2(lines 14 19) the Hoare annotation is: true [2021-05-02 23:15:34,904 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertEXIT(lines 14 19) the Hoare annotation is: true [2021-05-02 23:15:34,905 INFO L194 CegarLoopUtils]: At program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 16) the Hoare annotation is: (or (not (= main_~i~0 9)) (forall ((v_main_~sn~0_57 Int)) (not (= |__VERIFIER_assert_#in~cond| (ite (or (= 16 v_main_~sn~0_57) (= v_main_~sn~0_57 0)) 1 0))))) [2021-05-02 23:15:34,920 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 11:15:34 BoogieIcfgContainer [2021-05-02 23:15:34,920 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 23:15:34,921 INFO L168 Benchmark]: Toolchain (without parser) took 8375.80 ms. Allocated memory was 185.6 MB in the beginning and 306.2 MB in the end (delta: 120.6 MB). Free memory was 151.2 MB in the beginning and 207.9 MB in the end (delta: -56.7 MB). Peak memory consumption was 163.0 MB. Max. memory is 8.0 GB. [2021-05-02 23:15:34,921 INFO L168 Benchmark]: CDTParser took 0.15 ms. Allocated memory is still 185.6 MB. Free memory is still 168.0 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 23:15:34,921 INFO L168 Benchmark]: CACSL2BoogieTranslator took 287.55 ms. Allocated memory is still 185.6 MB. Free memory was 150.9 MB in the beginning and 169.1 MB in the end (delta: -18.1 MB). Peak memory consumption was 10.9 MB. Max. memory is 8.0 GB. [2021-05-02 23:15:34,921 INFO L168 Benchmark]: Boogie Preprocessor took 45.13 ms. Allocated memory is still 185.6 MB. Free memory was 169.1 MB in the beginning and 167.5 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 23:15:34,921 INFO L168 Benchmark]: RCFGBuilder took 429.03 ms. Allocated memory is still 185.6 MB. Free memory was 167.5 MB in the beginning and 154.6 MB in the end (delta: 12.9 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-05-02 23:15:34,922 INFO L168 Benchmark]: TraceAbstraction took 7605.23 ms. Allocated memory was 185.6 MB in the beginning and 306.2 MB in the end (delta: 120.6 MB). Free memory was 154.2 MB in the beginning and 207.9 MB in the end (delta: -53.6 MB). Peak memory consumption was 165.7 MB. Max. memory is 8.0 GB. [2021-05-02 23:15:34,922 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15 ms. Allocated memory is still 185.6 MB. Free memory is still 168.0 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 287.55 ms. Allocated memory is still 185.6 MB. Free memory was 150.9 MB in the beginning and 169.1 MB in the end (delta: -18.1 MB). Peak memory consumption was 10.9 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 45.13 ms. Allocated memory is still 185.6 MB. Free memory was 169.1 MB in the beginning and 167.5 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 8.0 GB. * RCFGBuilder took 429.03 ms. Allocated memory is still 185.6 MB. Free memory was 167.5 MB in the beginning and 154.6 MB in the end (delta: 12.9 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 7605.23 ms. Allocated memory was 185.6 MB in the beginning and 306.2 MB in the end (delta: 120.6 MB). Free memory was 154.2 MB in the beginning and 207.9 MB in the end (delta: -53.6 MB). Peak memory consumption was 165.7 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 16]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6833.3ms, OverallIterations: 9, TraceHistogramMax: 8, EmptinessCheckTime: 16.3ms, AutomataDifference: 2694.3ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 700.9ms, InitialAbstractionConstructionTime: 25.5ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 97 SDtfs, 185 SDslu, 282 SDs, 0 SdLazy, 1359 SolverSat, 90 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 808.6ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 241 GetRequests, 95 SyntacticMatches, 14 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 2409.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=37occurred in iteration=8, InterpolantAutomatonStates: 80, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 86.7ms AutomataMinimizationTime, 9 MinimizatonAttempts, 10 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 20 LocationsWithAnnotation, 74 PreInvPairs, 122 NumberOfFragments, 280 HoareAnnotationTreeSize, 74 FomulaSimplifications, 14038 FormulaSimplificationTreeSizeReduction, 123.9ms HoareSimplificationTime, 20 FomulaSimplificationsInter, 1028 FormulaSimplificationTreeSizeReductionInter, 561.5ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: No data available, 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: ((((((((i == 8 && 6 == sn) || (i == 4 && 6 == sn)) || (sn == 4 && i == 3)) || (7 == i && 6 == sn)) || (i == 2 && 2 == sn)) || (sn == 0 && i == 1)) || (i == 6 && 6 == sn)) || (5 == i && 6 == sn)) || i == 9 - ProcedureContractResult [Line: 22]: Procedure Contract for main Derived contract for procedure main: 1 - ProcedureContractResult [Line: 14]: Procedure Contract for __VERIFIER_assert Derived contract for procedure __VERIFIER_assert: 1 RESULT: Ultimate proved your program to be correct! Received shutdown request...