/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_copy4_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:24:17,962 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:24:17,966 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:24:18,026 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-21 21:24:18,027 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-21 21:24:18,032 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-21 21:24:18,036 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-21 21:24:18,044 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-21 21:24:18,048 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-21 21:24:18,054 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-21 21:24:18,056 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-21 21:24:18,057 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2020-12-21 21:24:18,140 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:24:18,197 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:24:18,197 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:24:18,202 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:24:18,203 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:24:18,203 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:24:18,203 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:24:18,203 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:24:18,204 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:24:18,204 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:24:18,204 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:24:18,206 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:24:18,206 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:24:18,206 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:24:18,206 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:24:18,207 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:24:18,207 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:24:18,207 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:24:18,207 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:24:18,208 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:24:18,208 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:24:18,208 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:24:18,209 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:24:18,209 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:24:18,209 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:24:18,209 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:24:18,209 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:24:18,627 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:24:18,663 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:24:18,666 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:24:18,667 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:24:18,668 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:24:18,669 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_copy4_ground-1.i [2020-12-21 21:24:18,764 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c143a81bc/7a9fd906f6534933ac601dc3ce956855/FLAG43959612f [2020-12-21 21:24:19,485 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:24:19,485 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy4_ground-1.i [2020-12-21 21:24:19,493 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c143a81bc/7a9fd906f6534933ac601dc3ce956855/FLAG43959612f [2020-12-21 21:24:19,866 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c143a81bc/7a9fd906f6534933ac601dc3ce956855 [2020-12-21 21:24:19,870 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:24:19,873 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:24:19,877 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:24:19,878 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:24:19,882 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:24:19,884 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:24:19" (1/1) ... [2020-12-21 21:24:19,886 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7959fbab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:19, skipping insertion in model container [2020-12-21 21:24:19,887 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:24:19" (1/1) ... [2020-12-21 21:24:19,897 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:24:19,924 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:24:20,074 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy4_ground-1.i[816,829] [2020-12-21 21:24:20,095 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:24:20,105 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:24:20,120 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy4_ground-1.i[816,829] [2020-12-21 21:24:20,132 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:24:20,151 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:24:20,151 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20 WrapperNode [2020-12-21 21:24:20,151 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:24:20,153 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:24:20,153 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:24:20,153 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:24:20,163 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,172 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,202 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:24:20,203 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:24:20,203 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:24:20,203 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:24:20,214 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,214 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,217 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,218 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,226 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,232 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,234 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,237 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:24:20,238 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:24:20,238 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:24:20,239 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:24:20,239 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (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 [2020-12-21 21:24:20,343 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:24:20,343 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:24:20,344 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:24:20,344 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:24:20,344 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:24:20,344 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:24:20,344 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:24:20,789 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:24:20,789 INFO L299 CfgBuilder]: Removed 12 assume(true) statements. [2020-12-21 21:24:20,791 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:24:20 BoogieIcfgContainer [2020-12-21 21:24:20,792 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:24:20,794 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:24:20,794 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:24:20,798 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:24:20,798 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:24:19" (1/3) ... [2020-12-21 21:24:20,800 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11458242 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:24:20, skipping insertion in model container [2020-12-21 21:24:20,800 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (2/3) ... [2020-12-21 21:24:20,800 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11458242 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:24:20, skipping insertion in model container [2020-12-21 21:24:20,800 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:24:20" (3/3) ... [2020-12-21 21:24:20,802 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_copy4_ground-1.i [2020-12-21 21:24:20,811 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:24:20,818 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:24:20,847 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:24:20,880 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:24:20,880 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:24:20,880 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:24:20,881 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:24:20,881 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:24:20,881 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:24:20,881 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:24:20,881 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:24:20,919 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-12-21 21:24:20,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-21 21:24:20,932 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:20,934 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:20,937 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:20,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:20,955 INFO L82 PathProgramCache]: Analyzing trace with hash 1890477095, now seen corresponding path program 1 times [2020-12-21 21:24:20,970 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:20,970 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343935332] [2020-12-21 21:24:20,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:21,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:21,291 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:24:21,293 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343935332] [2020-12-21 21:24:21,294 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:24:21,294 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:24:21,295 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777917657] [2020-12-21 21:24:21,300 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:24:21,301 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:21,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:24:21,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:24:21,329 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2020-12-21 21:24:21,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:21,396 INFO L93 Difference]: Finished difference Result 52 states and 76 transitions. [2020-12-21 21:24:21,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:24:21,399 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2020-12-21 21:24:21,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:21,420 INFO L225 Difference]: With dead ends: 52 [2020-12-21 21:24:21,420 INFO L226 Difference]: Without dead ends: 25 [2020-12-21 21:24:21,423 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:24:21,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-12-21 21:24:21,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2020-12-21 21:24:21,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-21 21:24:21,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-12-21 21:24:21,472 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 15 [2020-12-21 21:24:21,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:21,473 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-12-21 21:24:21,473 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:24:21,473 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-12-21 21:24:21,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-21 21:24:21,475 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:21,475 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:21,476 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:24:21,477 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:21,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:21,482 INFO L82 PathProgramCache]: Analyzing trace with hash 1812867813, now seen corresponding path program 1 times [2020-12-21 21:24:21,482 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:21,483 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023971852] [2020-12-21 21:24:21,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:21,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:21,542 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:24:21,543 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023971852] [2020-12-21 21:24:21,543 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1985599194] [2020-12-21 21:24:21,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:21,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:21,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 2 conjunts are in the unsatisfiable core [2020-12-21 21:24:21,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:21,647 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:24:21,647 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-21 21:24:21,647 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2020-12-21 21:24:21,649 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970741081] [2020-12-21 21:24:21,649 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:24:21,650 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:21,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:24:21,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:21,651 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 3 states. [2020-12-21 21:24:21,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:21,738 INFO L93 Difference]: Finished difference Result 48 states and 60 transitions. [2020-12-21 21:24:21,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:24:21,742 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-12-21 21:24:21,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:21,744 INFO L225 Difference]: With dead ends: 48 [2020-12-21 21:24:21,744 INFO L226 Difference]: Without dead ends: 32 [2020-12-21 21:24:21,746 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:21,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-21 21:24:21,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2020-12-21 21:24:21,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-21 21:24:21,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2020-12-21 21:24:21,762 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 17 [2020-12-21 21:24:21,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:21,763 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2020-12-21 21:24:21,763 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:24:21,763 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2020-12-21 21:24:21,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-21 21:24:21,764 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:21,764 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:21,978 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:24:21,979 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:21,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:21,981 INFO L82 PathProgramCache]: Analyzing trace with hash -2029995939, now seen corresponding path program 1 times [2020-12-21 21:24:21,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:21,982 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306651771] [2020-12-21 21:24:21,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:22,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:22,092 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-21 21:24:22,092 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306651771] [2020-12-21 21:24:22,093 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409089832] [2020-12-21 21:24:22,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:22,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:22,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:24:22,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:22,228 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-21 21:24:22,229 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:22,229 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:24:22,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779421936] [2020-12-21 21:24:22,230 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:24:22,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:22,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:24:22,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:22,232 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 5 states. [2020-12-21 21:24:22,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:22,258 INFO L93 Difference]: Finished difference Result 54 states and 64 transitions. [2020-12-21 21:24:22,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:24:22,259 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2020-12-21 21:24:22,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:22,260 INFO L225 Difference]: With dead ends: 54 [2020-12-21 21:24:22,260 INFO L226 Difference]: Without dead ends: 31 [2020-12-21 21:24:22,261 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:22,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-21 21:24:22,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2020-12-21 21:24:22,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-21 21:24:22,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-12-21 21:24:22,268 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 25 [2020-12-21 21:24:22,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:22,268 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-12-21 21:24:22,269 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:24:22,269 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-12-21 21:24:22,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-21 21:24:22,270 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:22,270 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:22,483 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:22,484 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:22,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:22,486 INFO L82 PathProgramCache]: Analyzing trace with hash 2073930139, now seen corresponding path program 2 times [2020-12-21 21:24:22,487 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:22,487 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236704599] [2020-12-21 21:24:22,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:22,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:22,539 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-12-21 21:24:22,540 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236704599] [2020-12-21 21:24:22,540 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391584512] [2020-12-21 21:24:22,541 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:22,631 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:22,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:22,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:24:22,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:22,705 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-12-21 21:24:22,705 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:22,705 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:24:22,706 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018569632] [2020-12-21 21:24:22,706 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:24:22,707 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:22,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:24:22,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:22,708 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 5 states. [2020-12-21 21:24:22,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:22,798 INFO L93 Difference]: Finished difference Result 61 states and 73 transitions. [2020-12-21 21:24:22,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:24:22,799 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-12-21 21:24:22,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:22,800 INFO L225 Difference]: With dead ends: 61 [2020-12-21 21:24:22,800 INFO L226 Difference]: Without dead ends: 42 [2020-12-21 21:24:22,801 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:22,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-12-21 21:24:22,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 38. [2020-12-21 21:24:22,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-21 21:24:22,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-12-21 21:24:22,809 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 27 [2020-12-21 21:24:22,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:22,810 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-12-21 21:24:22,810 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:24:22,810 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-12-21 21:24:22,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-12-21 21:24:22,811 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:22,811 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:23,026 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:23,027 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:23,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:23,028 INFO L82 PathProgramCache]: Analyzing trace with hash -662535917, now seen corresponding path program 3 times [2020-12-21 21:24:23,029 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:23,030 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496801594] [2020-12-21 21:24:23,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:23,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:23,111 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-21 21:24:23,111 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496801594] [2020-12-21 21:24:23,111 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404292734] [2020-12-21 21:24:23,112 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:23,184 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-21 21:24:23,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:23,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:24:23,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:23,232 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-21 21:24:23,233 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:23,233 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-21 21:24:23,233 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226342749] [2020-12-21 21:24:23,234 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-21 21:24:23,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:23,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-21 21:24:23,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:24:23,235 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 6 states. [2020-12-21 21:24:23,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:23,256 INFO L93 Difference]: Finished difference Result 72 states and 82 transitions. [2020-12-21 21:24:23,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-21 21:24:23,257 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 35 [2020-12-21 21:24:23,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:23,258 INFO L225 Difference]: With dead ends: 72 [2020-12-21 21:24:23,258 INFO L226 Difference]: Without dead ends: 41 [2020-12-21 21:24:23,259 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:24:23,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-21 21:24:23,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2020-12-21 21:24:23,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-21 21:24:23,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2020-12-21 21:24:23,265 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 35 [2020-12-21 21:24:23,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:23,266 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2020-12-21 21:24:23,266 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-21 21:24:23,266 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2020-12-21 21:24:23,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-21 21:24:23,267 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:23,267 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:23,472 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:23,473 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:23,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:23,475 INFO L82 PathProgramCache]: Analyzing trace with hash 365526225, now seen corresponding path program 4 times [2020-12-21 21:24:23,475 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:23,476 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065547254] [2020-12-21 21:24:23,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:23,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:23,546 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-21 21:24:23,547 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065547254] [2020-12-21 21:24:23,547 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304873137] [2020-12-21 21:24:23,547 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:23,615 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:23,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:23,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:24:23,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:23,663 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-21 21:24:23,664 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:23,664 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-21 21:24:23,665 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205244297] [2020-12-21 21:24:23,665 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:24:23,665 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:23,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:24:23,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:24:23,666 INFO L87 Difference]: Start difference. First operand 40 states and 45 transitions. Second operand 7 states. [2020-12-21 21:24:23,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:23,691 INFO L93 Difference]: Finished difference Result 74 states and 84 transitions. [2020-12-21 21:24:23,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-21 21:24:23,692 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 37 [2020-12-21 21:24:23,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:23,693 INFO L225 Difference]: With dead ends: 74 [2020-12-21 21:24:23,693 INFO L226 Difference]: Without dead ends: 43 [2020-12-21 21:24:23,694 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:24:23,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-21 21:24:23,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2020-12-21 21:24:23,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-12-21 21:24:23,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-12-21 21:24:23,707 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 37 [2020-12-21 21:24:23,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:23,708 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-12-21 21:24:23,708 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:24:23,709 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-12-21 21:24:23,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-21 21:24:23,710 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:23,710 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:23,923 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:24:23,924 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:23,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:23,925 INFO L82 PathProgramCache]: Analyzing trace with hash 490766607, now seen corresponding path program 5 times [2020-12-21 21:24:23,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:23,926 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292785267] [2020-12-21 21:24:23,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:23,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:24,037 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-21 21:24:24,039 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292785267] [2020-12-21 21:24:24,039 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091616520] [2020-12-21 21:24:24,039 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:24,643 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2020-12-21 21:24:24,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:24,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:24:24,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:24,741 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-21 21:24:24,742 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:24,742 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 10 [2020-12-21 21:24:24,742 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031382143] [2020-12-21 21:24:24,743 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 21:24:24,743 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:24,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 21:24:24,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:24:24,744 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 10 states. [2020-12-21 21:24:24,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:24,894 INFO L93 Difference]: Finished difference Result 88 states and 102 transitions. [2020-12-21 21:24:24,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:24:24,898 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2020-12-21 21:24:24,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:24,899 INFO L225 Difference]: With dead ends: 88 [2020-12-21 21:24:24,899 INFO L226 Difference]: Without dead ends: 57 [2020-12-21 21:24:24,900 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:24:24,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-12-21 21:24:24,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 52. [2020-12-21 21:24:24,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-21 21:24:24,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-12-21 21:24:24,908 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 39 [2020-12-21 21:24:24,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:24,908 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-12-21 21:24:24,908 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 21:24:24,908 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-12-21 21:24:24,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-21 21:24:24,910 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:24,910 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:25,120 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:25,121 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:25,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:25,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1480545093, now seen corresponding path program 6 times [2020-12-21 21:24:25,123 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:25,123 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80186423] [2020-12-21 21:24:25,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:25,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:25,255 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:24:25,256 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80186423] [2020-12-21 21:24:25,256 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [879213456] [2020-12-21 21:24:25,256 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:25,434 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2020-12-21 21:24:25,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:25,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:24:25,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:25,531 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-12-21 21:24:25,532 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:25,532 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 12 [2020-12-21 21:24:25,532 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683340166] [2020-12-21 21:24:25,533 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:24:25,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:25,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:24:25,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:25,534 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 12 states. [2020-12-21 21:24:25,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:25,697 INFO L93 Difference]: Finished difference Result 106 states and 120 transitions. [2020-12-21 21:24:25,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:24:25,698 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 49 [2020-12-21 21:24:25,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:25,699 INFO L225 Difference]: With dead ends: 106 [2020-12-21 21:24:25,699 INFO L226 Difference]: Without dead ends: 67 [2020-12-21 21:24:25,700 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:25,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-12-21 21:24:25,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 62. [2020-12-21 21:24:25,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-12-21 21:24:25,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2020-12-21 21:24:25,708 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 49 [2020-12-21 21:24:25,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:25,709 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2020-12-21 21:24:25,709 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:24:25,709 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2020-12-21 21:24:25,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-12-21 21:24:25,711 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:25,711 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:25,912 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:25,913 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:25,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:25,914 INFO L82 PathProgramCache]: Analyzing trace with hash -352839173, now seen corresponding path program 7 times [2020-12-21 21:24:25,914 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:25,915 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1954985658] [2020-12-21 21:24:25,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:25,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:26,110 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:24:26,110 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1954985658] [2020-12-21 21:24:26,111 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657273142] [2020-12-21 21:24:26,111 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:26,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:26,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 21:24:26,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:26,319 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:24:26,319 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:26,319 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-21 21:24:26,322 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005891826] [2020-12-21 21:24:26,323 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 21:24:26,323 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:26,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 21:24:26,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:24:26,324 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand 10 states. [2020-12-21 21:24:26,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:26,364 INFO L93 Difference]: Finished difference Result 112 states and 122 transitions. [2020-12-21 21:24:26,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:24:26,365 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 59 [2020-12-21 21:24:26,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:26,366 INFO L225 Difference]: With dead ends: 112 [2020-12-21 21:24:26,366 INFO L226 Difference]: Without dead ends: 65 [2020-12-21 21:24:26,366 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:24:26,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-12-21 21:24:26,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2020-12-21 21:24:26,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-12-21 21:24:26,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2020-12-21 21:24:26,375 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 59 [2020-12-21 21:24:26,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:26,375 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2020-12-21 21:24:26,375 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 21:24:26,375 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2020-12-21 21:24:26,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-21 21:24:26,376 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:26,377 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:26,586 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:24:26,587 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:26,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:26,588 INFO L82 PathProgramCache]: Analyzing trace with hash -1382597703, now seen corresponding path program 8 times [2020-12-21 21:24:26,588 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:26,589 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1506839404] [2020-12-21 21:24:26,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:26,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:26,747 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:24:26,748 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1506839404] [2020-12-21 21:24:26,748 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [515056618] [2020-12-21 21:24:26,748 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:26,831 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:26,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:26,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:24:26,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:26,904 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:24:26,905 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:26,905 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 21:24:26,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941129357] [2020-12-21 21:24:26,906 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:24:26,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:26,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:24:26,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:24:26,907 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 11 states. [2020-12-21 21:24:26,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:26,946 INFO L93 Difference]: Finished difference Result 114 states and 124 transitions. [2020-12-21 21:24:26,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:24:26,947 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 61 [2020-12-21 21:24:26,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:26,948 INFO L225 Difference]: With dead ends: 114 [2020-12-21 21:24:26,948 INFO L226 Difference]: Without dead ends: 67 [2020-12-21 21:24:26,949 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:24:26,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-12-21 21:24:26,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2020-12-21 21:24:26,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-12-21 21:24:26,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2020-12-21 21:24:26,956 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 61 [2020-12-21 21:24:26,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:26,956 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2020-12-21 21:24:26,956 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:24:26,957 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2020-12-21 21:24:26,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-12-21 21:24:26,958 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:26,958 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:27,171 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:27,172 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:27,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:27,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1156900343, now seen corresponding path program 9 times [2020-12-21 21:24:27,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:27,185 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988041242] [2020-12-21 21:24:27,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:27,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:27,330 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:24:27,331 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988041242] [2020-12-21 21:24:27,331 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [866912247] [2020-12-21 21:24:27,331 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:27,547 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-12-21 21:24:27,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:27,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:24:27,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:27,674 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2020-12-21 21:24:27,674 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:27,674 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 16 [2020-12-21 21:24:27,675 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439434454] [2020-12-21 21:24:27,675 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-21 21:24:27,676 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:27,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-21 21:24:27,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:24:27,677 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 16 states. [2020-12-21 21:24:27,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:27,873 INFO L93 Difference]: Finished difference Result 128 states and 142 transitions. [2020-12-21 21:24:27,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-21 21:24:27,874 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 63 [2020-12-21 21:24:27,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:27,875 INFO L225 Difference]: With dead ends: 128 [2020-12-21 21:24:27,875 INFO L226 Difference]: Without dead ends: 81 [2020-12-21 21:24:27,876 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:24:27,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-12-21 21:24:27,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2020-12-21 21:24:27,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-12-21 21:24:27,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 81 transitions. [2020-12-21 21:24:27,898 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 81 transitions. Word has length 63 [2020-12-21 21:24:27,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:27,899 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 81 transitions. [2020-12-21 21:24:27,899 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-21 21:24:27,899 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 81 transitions. [2020-12-21 21:24:27,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-12-21 21:24:27,903 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:27,904 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:28,122 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:28,123 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:28,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:28,125 INFO L82 PathProgramCache]: Analyzing trace with hash 2005284397, now seen corresponding path program 10 times [2020-12-21 21:24:28,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:28,125 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867062121] [2020-12-21 21:24:28,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:28,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:28,324 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-21 21:24:28,325 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867062121] [2020-12-21 21:24:28,325 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1361696873] [2020-12-21 21:24:28,325 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:28,412 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:28,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:28,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 21:24:28,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:28,570 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2020-12-21 21:24:28,571 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:28,571 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 18 [2020-12-21 21:24:28,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654014174] [2020-12-21 21:24:28,571 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:24:28,572 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:28,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:24:28,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=213, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:24:28,573 INFO L87 Difference]: Start difference. First operand 76 states and 81 transitions. Second operand 18 states. [2020-12-21 21:24:28,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:28,783 INFO L93 Difference]: Finished difference Result 146 states and 160 transitions. [2020-12-21 21:24:28,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:24:28,784 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 73 [2020-12-21 21:24:28,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:28,785 INFO L225 Difference]: With dead ends: 146 [2020-12-21 21:24:28,785 INFO L226 Difference]: Without dead ends: 91 [2020-12-21 21:24:28,786 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=213, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:24:28,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-12-21 21:24:28,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 86. [2020-12-21 21:24:28,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-12-21 21:24:28,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 91 transitions. [2020-12-21 21:24:28,791 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 91 transitions. Word has length 73 [2020-12-21 21:24:28,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:28,792 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 91 transitions. [2020-12-21 21:24:28,792 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:24:28,792 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 91 transitions. [2020-12-21 21:24:28,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-12-21 21:24:28,793 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:28,793 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:29,007 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:24:29,008 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:29,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:29,009 INFO L82 PathProgramCache]: Analyzing trace with hash 1859910371, now seen corresponding path program 11 times [2020-12-21 21:24:29,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:29,009 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687317948] [2020-12-21 21:24:29,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:29,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:29,253 INFO L134 CoverageAnalysis]: Checked inductivity of 244 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-12-21 21:24:29,254 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [687317948] [2020-12-21 21:24:29,254 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085295968] [2020-12-21 21:24:29,254 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:15,202 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2020-12-21 21:26:15,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:26:15,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 21:26:15,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:26:15,484 INFO L134 CoverageAnalysis]: Checked inductivity of 244 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2020-12-21 21:26:15,485 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:26:15,485 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 20 [2020-12-21 21:26:15,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832923504] [2020-12-21 21:26:15,486 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-21 21:26:15,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:26:15,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-21 21:26:15,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=267, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:26:15,487 INFO L87 Difference]: Start difference. First operand 86 states and 91 transitions. Second operand 20 states. [2020-12-21 21:26:15,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:26:15,702 INFO L93 Difference]: Finished difference Result 164 states and 178 transitions. [2020-12-21 21:26:15,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-21 21:26:15,704 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 83 [2020-12-21 21:26:15,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:26:15,705 INFO L225 Difference]: With dead ends: 164 [2020-12-21 21:26:15,705 INFO L226 Difference]: Without dead ends: 101 [2020-12-21 21:26:15,706 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=113, Invalid=267, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:26:15,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-12-21 21:26:15,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 96. [2020-12-21 21:26:15,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-12-21 21:26:15,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 101 transitions. [2020-12-21 21:26:15,712 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 101 transitions. Word has length 83 [2020-12-21 21:26:15,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:26:15,712 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 101 transitions. [2020-12-21 21:26:15,712 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-21 21:26:15,712 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 101 transitions. [2020-12-21 21:26:15,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-12-21 21:26:15,713 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:26:15,713 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:26:15,927 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 21:26:15,928 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:26:15,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:26:15,929 INFO L82 PathProgramCache]: Analyzing trace with hash -2078895079, now seen corresponding path program 12 times [2020-12-21 21:26:15,929 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:26:15,930 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170756437] [2020-12-21 21:26:15,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:26:15,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:16,157 INFO L134 CoverageAnalysis]: Checked inductivity of 317 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:26:16,158 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170756437] [2020-12-21 21:26:16,159 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979025515] [2020-12-21 21:26:16,159 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:22,216 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2020-12-21 21:26:22,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:26:22,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 26 conjunts are in the unsatisfiable core [2020-12-21 21:26:22,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:26:22,325 INFO L134 CoverageAnalysis]: Checked inductivity of 317 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:26:22,325 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:26:22,326 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-21 21:26:22,326 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641158525] [2020-12-21 21:26:22,326 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 21:26:22,327 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:26:22,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 21:26:22,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:26:22,328 INFO L87 Difference]: Start difference. First operand 96 states and 101 transitions. Second operand 15 states. [2020-12-21 21:26:22,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:26:22,383 INFO L93 Difference]: Finished difference Result 170 states and 180 transitions. [2020-12-21 21:26:22,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-21 21:26:22,384 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 93 [2020-12-21 21:26:22,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:26:22,385 INFO L225 Difference]: With dead ends: 170 [2020-12-21 21:26:22,385 INFO L226 Difference]: Without dead ends: 99 [2020-12-21 21:26:22,386 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:26:22,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-12-21 21:26:22,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2020-12-21 21:26:22,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-12-21 21:26:22,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 103 transitions. [2020-12-21 21:26:22,391 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 103 transitions. Word has length 93 [2020-12-21 21:26:22,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:26:22,391 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 103 transitions. [2020-12-21 21:26:22,391 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 21:26:22,392 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 103 transitions. [2020-12-21 21:26:22,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-12-21 21:26:22,392 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:26:22,393 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:26:22,607 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 21:26:22,608 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:26:22,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:26:22,609 INFO L82 PathProgramCache]: Analyzing trace with hash 613140055, now seen corresponding path program 13 times [2020-12-21 21:26:22,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:26:22,610 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1959051470] [2020-12-21 21:26:22,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:26:22,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:22,784 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:26:22,785 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1959051470] [2020-12-21 21:26:22,785 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2095650223] [2020-12-21 21:26:22,785 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:22,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:22,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-21 21:26:22,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:26:23,019 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:26:23,020 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:26:23,020 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-21 21:26:23,020 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440502467] [2020-12-21 21:26:23,020 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-21 21:26:23,021 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:26:23,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-21 21:26:23,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:26:23,023 INFO L87 Difference]: Start difference. First operand 98 states and 103 transitions. Second operand 16 states. [2020-12-21 21:26:23,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:26:23,084 INFO L93 Difference]: Finished difference Result 172 states and 182 transitions. [2020-12-21 21:26:23,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-21 21:26:23,085 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 95 [2020-12-21 21:26:23,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:26:23,086 INFO L225 Difference]: With dead ends: 172 [2020-12-21 21:26:23,086 INFO L226 Difference]: Without dead ends: 101 [2020-12-21 21:26:23,090 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:26:23,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-12-21 21:26:23,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2020-12-21 21:26:23,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-12-21 21:26:23,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 105 transitions. [2020-12-21 21:26:23,099 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 105 transitions. Word has length 95 [2020-12-21 21:26:23,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:26:23,100 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 105 transitions. [2020-12-21 21:26:23,100 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-21 21:26:23,100 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 105 transitions. [2020-12-21 21:26:23,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-12-21 21:26:23,101 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:26:23,101 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:26:23,315 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:23,316 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:26:23,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:26:23,317 INFO L82 PathProgramCache]: Analyzing trace with hash 2088591637, now seen corresponding path program 14 times [2020-12-21 21:26:23,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:26:23,317 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202902292] [2020-12-21 21:26:23,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:26:23,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:23,516 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:26:23,517 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202902292] [2020-12-21 21:26:23,517 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593295476] [2020-12-21 21:26:23,517 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:23,628 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:26:23,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:26:23,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-21 21:26:23,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:26:23,762 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:26:23,762 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:26:23,762 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-21 21:26:23,763 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237339786] [2020-12-21 21:26:23,763 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-21 21:26:23,763 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:26:23,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-21 21:26:23,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:26:23,764 INFO L87 Difference]: Start difference. First operand 100 states and 105 transitions. Second operand 17 states. [2020-12-21 21:26:23,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:26:23,826 INFO L93 Difference]: Finished difference Result 174 states and 184 transitions. [2020-12-21 21:26:23,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-21 21:26:23,827 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 97 [2020-12-21 21:26:23,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:26:23,828 INFO L225 Difference]: With dead ends: 174 [2020-12-21 21:26:23,828 INFO L226 Difference]: Without dead ends: 103 [2020-12-21 21:26:23,829 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:26:23,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-12-21 21:26:23,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2020-12-21 21:26:23,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-12-21 21:26:23,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 107 transitions. [2020-12-21 21:26:23,833 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 107 transitions. Word has length 97 [2020-12-21 21:26:23,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:26:23,834 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 107 transitions. [2020-12-21 21:26:23,834 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-21 21:26:23,834 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 107 transitions. [2020-12-21 21:26:23,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-12-21 21:26:23,835 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:26:23,835 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:26:24,049 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-21 21:26:24,050 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:26:24,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:26:24,051 INFO L82 PathProgramCache]: Analyzing trace with hash -1636613037, now seen corresponding path program 15 times [2020-12-21 21:26:24,051 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:26:24,052 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695577338] [2020-12-21 21:26:24,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:26:24,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:24,274 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-21 21:26:24,275 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695577338] [2020-12-21 21:26:24,275 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1443851694] [2020-12-21 21:26:24,276 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:27,044 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2020-12-21 21:26:27,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:26:27,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:26:27,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:26:27,275 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 343 trivial. 0 not checked. [2020-12-21 21:26:27,275 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:26:27,276 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 10] total 25 [2020-12-21 21:26:27,276 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855423682] [2020-12-21 21:26:27,277 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-21 21:26:27,277 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:26:27,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-21 21:26:27,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-12-21 21:26:27,281 INFO L87 Difference]: Start difference. First operand 102 states and 107 transitions. Second operand 25 states. [2020-12-21 21:26:27,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:26:27,574 INFO L93 Difference]: Finished difference Result 188 states and 202 transitions. [2020-12-21 21:26:27,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-21 21:26:27,575 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 99 [2020-12-21 21:26:27,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:26:27,576 INFO L225 Difference]: With dead ends: 188 [2020-12-21 21:26:27,576 INFO L226 Difference]: Without dead ends: 117 [2020-12-21 21:26:27,577 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-12-21 21:26:27,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-12-21 21:26:27,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 112. [2020-12-21 21:26:27,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-12-21 21:26:27,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 117 transitions. [2020-12-21 21:26:27,582 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 117 transitions. Word has length 99 [2020-12-21 21:26:27,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:26:27,582 INFO L481 AbstractCegarLoop]: Abstraction has 112 states and 117 transitions. [2020-12-21 21:26:27,582 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-21 21:26:27,582 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 117 transitions. [2020-12-21 21:26:27,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-12-21 21:26:27,583 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:26:27,584 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:26:27,797 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 21:26:27,798 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:26:27,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:26:27,799 INFO L82 PathProgramCache]: Analyzing trace with hash -948989559, now seen corresponding path program 16 times [2020-12-21 21:26:27,799 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:26:27,800 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438397282] [2020-12-21 21:26:27,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:26:27,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:28,026 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-21 21:26:28,027 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438397282] [2020-12-21 21:26:28,027 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [854972750] [2020-12-21 21:26:28,027 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:26:28,133 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:26:28,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:26:28,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-21 21:26:28,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:26:28,292 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-21 21:26:28,292 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:26:28,293 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-21 21:26:28,293 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830154052] [2020-12-21 21:26:28,293 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-21 21:26:28,294 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:26:28,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-21 21:26:28,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:26:28,295 INFO L87 Difference]: Start difference. First operand 112 states and 117 transitions. Second operand 19 states. [2020-12-21 21:26:28,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:26:28,364 INFO L93 Difference]: Finished difference Result 194 states and 204 transitions. [2020-12-21 21:26:28,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:26:28,365 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 109 [2020-12-21 21:26:28,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:26:28,366 INFO L225 Difference]: With dead ends: 194 [2020-12-21 21:26:28,366 INFO L226 Difference]: Without dead ends: 115 [2020-12-21 21:26:28,367 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:26:28,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-12-21 21:26:28,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2020-12-21 21:26:28,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-12-21 21:26:28,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 119 transitions. [2020-12-21 21:26:28,373 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 119 transitions. Word has length 109 [2020-12-21 21:26:28,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:26:28,373 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 119 transitions. [2020-12-21 21:26:28,373 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-21 21:26:28,373 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 119 transitions. [2020-12-21 21:26:28,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-12-21 21:26:28,374 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:26:28,375 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:26:28,588 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-21 21:26:28,589 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:26:28,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:26:28,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1805350969, now seen corresponding path program 17 times [2020-12-21 21:26:28,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:26:28,590 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063336988] [2020-12-21 21:26:28,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:26:28,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:26:28,845 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-21 21:26:28,845 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063336988] [2020-12-21 21:26:28,846 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [131635951] [2020-12-21 21:26:28,846 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true