/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_copy5_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:24:19,103 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:24:19,106 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:24:19,163 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-21 21:24:19,164 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-21 21:24:19,168 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-21 21:24:19,173 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-21 21:24:19,181 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-21 21:24:19,185 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-21 21:24:19,191 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-21 21:24:19,193 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-21 21:24:19,195 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2020-12-21 21:24:19,262 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:24:19,289 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:24:19,289 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:24:19,291 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:24:19,291 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:24:19,292 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:24:19,292 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:24:19,292 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:24:19,292 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:24:19,293 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:24:19,293 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:24:19,293 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:24:19,293 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:24:19,294 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:24:19,294 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:24:19,294 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:24:19,294 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:24:19,294 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:24:19,295 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:24:19,295 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:24:19,295 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:24:19,295 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:24:19,295 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:24:19,296 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:24:19,296 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:24:19,296 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:24:19,296 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:24:19,678 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:24:19,708 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:24:19,712 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:24:19,714 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:24:19,715 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:24:19,716 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_copy5_ground-1.i [2020-12-21 21:24:19,806 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b3f23696/ac38d2e8006547e481d73ab261e9a70d/FLAGe245bd206 [2020-12-21 21:24:20,475 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:24:20,476 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy5_ground-1.i [2020-12-21 21:24:20,484 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b3f23696/ac38d2e8006547e481d73ab261e9a70d/FLAGe245bd206 [2020-12-21 21:24:20,859 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b3f23696/ac38d2e8006547e481d73ab261e9a70d [2020-12-21 21:24:20,862 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:24:20,865 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:24:20,866 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:24:20,867 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:24:20,872 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:24:20,873 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,874 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5ed46bfc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20, skipping insertion in model container [2020-12-21 21:24:20,875 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,883 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:24:20,902 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:24:21,069 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_copy5_ground-1.i[816,829] [2020-12-21 21:24:21,092 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:24:21,102 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:24:21,118 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_copy5_ground-1.i[816,829] [2020-12-21 21:24:21,131 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:24:21,150 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:24:21,151 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:21 WrapperNode [2020-12-21 21:24:21,151 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:24:21,152 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:24:21,153 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:24:21,153 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:24:21,163 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:21" (1/1) ... [2020-12-21 21:24:21,173 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:21" (1/1) ... [2020-12-21 21:24:21,200 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:24:21,202 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:24:21,202 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:24:21,202 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:24:21,218 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:21" (1/1) ... [2020-12-21 21:24:21,219 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:21" (1/1) ... [2020-12-21 21:24:21,225 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:21" (1/1) ... [2020-12-21 21:24:21,226 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:21" (1/1) ... [2020-12-21 21:24:21,247 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:21" (1/1) ... [2020-12-21 21:24:21,255 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:21" (1/1) ... [2020-12-21 21:24:21,260 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:21" (1/1) ... [2020-12-21 21:24:21,269 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:24:21,271 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:24:21,271 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:24:21,271 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:24:21,273 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:21" (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 21:24:21,403 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:24:21,404 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:24:21,404 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:24:21,404 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:24:21,404 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:24:21,405 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:24:21,405 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:24:21,897 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:24:21,898 INFO L299 CfgBuilder]: Removed 13 assume(true) statements. [2020-12-21 21:24:21,901 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:24:21 BoogieIcfgContainer [2020-12-21 21:24:21,901 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:24:21,906 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:24:21,906 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:24:21,910 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:24:21,911 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:24:20" (1/3) ... [2020-12-21 21:24:21,914 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7925d989 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:24:21, skipping insertion in model container [2020-12-21 21:24:21,914 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:21" (2/3) ... [2020-12-21 21:24:21,915 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7925d989 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:24:21, skipping insertion in model container [2020-12-21 21:24:21,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:24:21" (3/3) ... [2020-12-21 21:24:21,917 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_copy5_ground-1.i [2020-12-21 21:24:21,924 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:24:21,929 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:24:21,948 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:24:21,988 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:24:21,989 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:24:21,989 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:24:21,989 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:24:21,989 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:24:21,990 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:24:21,990 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:24:21,990 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:24:22,007 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states. [2020-12-21 21:24:22,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-21 21:24:22,015 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:22,016 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 21:24:22,016 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:22,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:22,025 INFO L82 PathProgramCache]: Analyzing trace with hash -18882701, now seen corresponding path program 1 times [2020-12-21 21:24:22,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:22,043 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780923871] [2020-12-21 21:24:22,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:22,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:22,321 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 21:24:22,322 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780923871] [2020-12-21 21:24:22,323 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:24:22,323 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:24:22,324 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183503826] [2020-12-21 21:24:22,330 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:24:22,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:22,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:24:22,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:24:22,350 INFO L87 Difference]: Start difference. First operand 30 states. Second operand 3 states. [2020-12-21 21:24:22,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:22,392 INFO L93 Difference]: Finished difference Result 58 states and 86 transitions. [2020-12-21 21:24:22,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:24:22,395 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-12-21 21:24:22,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:22,406 INFO L225 Difference]: With dead ends: 58 [2020-12-21 21:24:22,406 INFO L226 Difference]: Without dead ends: 28 [2020-12-21 21:24:22,410 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 21:24:22,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-21 21:24:22,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-12-21 21:24:22,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-21 21:24:22,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2020-12-21 21:24:22,451 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 17 [2020-12-21 21:24:22,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:22,452 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2020-12-21 21:24:22,452 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:24:22,452 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2020-12-21 21:24:22,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-21 21:24:22,453 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:22,453 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:22,454 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:24:22,454 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:22,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:22,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1592499797, now seen corresponding path program 1 times [2020-12-21 21:24:22,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:22,456 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2077899524] [2020-12-21 21:24:22,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:22,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:22,554 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 21:24:22,555 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2077899524] [2020-12-21 21:24:22,555 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [919640273] [2020-12-21 21:24:22,555 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 21:24:22,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:22,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 2 conjunts are in the unsatisfiable core [2020-12-21 21:24:22,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:22,679 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 21:24:22,680 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-21 21:24:22,680 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2020-12-21 21:24:22,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982487613] [2020-12-21 21:24:22,682 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:24:22,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:22,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:24:22,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:22,683 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand 3 states. [2020-12-21 21:24:22,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:22,761 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2020-12-21 21:24:22,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:24:22,763 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-12-21 21:24:22,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:22,765 INFO L225 Difference]: With dead ends: 56 [2020-12-21 21:24:22,767 INFO L226 Difference]: Without dead ends: 37 [2020-12-21 21:24:22,769 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 19 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 21:24:22,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-12-21 21:24:22,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 32. [2020-12-21 21:24:22,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-21 21:24:22,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2020-12-21 21:24:22,780 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 19 [2020-12-21 21:24:22,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:22,782 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2020-12-21 21:24:22,782 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:24:22,782 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2020-12-21 21:24:22,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-21 21:24:22,784 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:22,785 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, 1, 1, 1, 1] [2020-12-21 21:24:22,995 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:24:22,996 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:22,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:22,998 INFO L82 PathProgramCache]: Analyzing trace with hash 722749857, now seen corresponding path program 1 times [2020-12-21 21:24:22,999 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:22,999 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632378064] [2020-12-21 21:24:23,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:23,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:23,058 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-21 21:24:23,059 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632378064] [2020-12-21 21:24:23,059 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [426501121] [2020-12-21 21:24:23,060 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 21:24:23,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:23,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:24:23,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:23,260 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-21 21:24:23,261 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:23,261 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:24:23,261 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742970197] [2020-12-21 21:24:23,262 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:24:23,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:23,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:24:23,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:23,263 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand 5 states. [2020-12-21 21:24:23,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:23,293 INFO L93 Difference]: Finished difference Result 62 states and 74 transitions. [2020-12-21 21:24:23,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:24:23,294 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 29 [2020-12-21 21:24:23,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:23,295 INFO L225 Difference]: With dead ends: 62 [2020-12-21 21:24:23,295 INFO L226 Difference]: Without dead ends: 35 [2020-12-21 21:24:23,296 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 29 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 21:24:23,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-12-21 21:24:23,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2020-12-21 21:24:23,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-21 21:24:23,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2020-12-21 21:24:23,302 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 29 [2020-12-21 21:24:23,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:23,302 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2020-12-21 21:24:23,302 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:24:23,303 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2020-12-21 21:24:23,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-21 21:24:23,306 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:23,306 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, 1, 1, 1, 1] [2020-12-21 21:24:23,506 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:23,507 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:23,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:23,509 INFO L82 PathProgramCache]: Analyzing trace with hash -1187353633, now seen corresponding path program 2 times [2020-12-21 21:24:23,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:23,510 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501185429] [2020-12-21 21:24:23,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:23,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:23,570 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-12-21 21:24:23,571 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501185429] [2020-12-21 21:24:23,571 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31174163] [2020-12-21 21:24:23,571 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 21:24:23,676 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:23,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:23,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:24:23,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:23,743 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-21 21:24:23,744 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:23,744 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2020-12-21 21:24:23,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900168938] [2020-12-21 21:24:23,745 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:24:23,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:23,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:24:23,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:24:23,747 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand 7 states. [2020-12-21 21:24:23,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:23,912 INFO L93 Difference]: Finished difference Result 79 states and 96 transitions. [2020-12-21 21:24:23,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 21:24:23,913 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 31 [2020-12-21 21:24:23,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:23,918 INFO L225 Difference]: With dead ends: 79 [2020-12-21 21:24:23,918 INFO L226 Difference]: Without dead ends: 52 [2020-12-21 21:24:23,920 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:24:23,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-12-21 21:24:23,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 46. [2020-12-21 21:24:23,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-12-21 21:24:23,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2020-12-21 21:24:23,941 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 31 [2020-12-21 21:24:23,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:23,945 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2020-12-21 21:24:23,945 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:24:23,945 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2020-12-21 21:24:23,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-12-21 21:24:23,946 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:23,946 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1] [2020-12-21 21:24:24,151 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:24,152 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:24,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:24,153 INFO L82 PathProgramCache]: Analyzing trace with hash -1347184621, now seen corresponding path program 3 times [2020-12-21 21:24:24,154 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:24,154 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1429132893] [2020-12-21 21:24:24,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:24,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:24,278 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-12-21 21:24:24,279 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1429132893] [2020-12-21 21:24:24,280 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1080184983] [2020-12-21 21:24:24,280 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 21:24:24,379 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-21 21:24:24,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:24,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:24:24,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:24,455 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-21 21:24:24,456 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:24,456 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2020-12-21 21:24:24,456 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583839907] [2020-12-21 21:24:24,457 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-21 21:24:24,457 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:24,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-21 21:24:24,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:24:24,459 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand 9 states. [2020-12-21 21:24:24,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:24,614 INFO L93 Difference]: Finished difference Result 101 states and 118 transitions. [2020-12-21 21:24:24,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:24:24,615 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 43 [2020-12-21 21:24:24,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:24,616 INFO L225 Difference]: With dead ends: 101 [2020-12-21 21:24:24,616 INFO L226 Difference]: Without dead ends: 64 [2020-12-21 21:24:24,617 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:24:24,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-12-21 21:24:24,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 58. [2020-12-21 21:24:24,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-12-21 21:24:24,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 64 transitions. [2020-12-21 21:24:24,626 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 64 transitions. Word has length 43 [2020-12-21 21:24:24,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:24,626 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 64 transitions. [2020-12-21 21:24:24,626 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-21 21:24:24,627 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 64 transitions. [2020-12-21 21:24:24,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-12-21 21:24:24,628 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:24,628 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:24,841 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:24,842 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:24,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:24,843 INFO L82 PathProgramCache]: Analyzing trace with hash 604038727, now seen corresponding path program 4 times [2020-12-21 21:24:24,843 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:24,844 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1188098659] [2020-12-21 21:24:24,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:24,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:24,989 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-21 21:24:24,990 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1188098659] [2020-12-21 21:24:24,990 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1763686177] [2020-12-21 21:24:24,990 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 21:24:25,076 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:25,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:25,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:24:25,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:25,168 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-21 21:24:25,169 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:25,169 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-21 21:24:25,169 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213621481] [2020-12-21 21:24:25,170 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-21 21:24:25,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:25,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-21 21:24:25,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:24:25,171 INFO L87 Difference]: Start difference. First operand 58 states and 64 transitions. Second operand 8 states. [2020-12-21 21:24:25,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:25,205 INFO L93 Difference]: Finished difference Result 108 states and 120 transitions. [2020-12-21 21:24:25,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 21:24:25,206 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 55 [2020-12-21 21:24:25,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:25,207 INFO L225 Difference]: With dead ends: 108 [2020-12-21 21:24:25,207 INFO L226 Difference]: Without dead ends: 61 [2020-12-21 21:24:25,208 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:24:25,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-12-21 21:24:25,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2020-12-21 21:24:25,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-12-21 21:24:25,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 66 transitions. [2020-12-21 21:24:25,216 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 66 transitions. Word has length 55 [2020-12-21 21:24:25,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:25,216 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 66 transitions. [2020-12-21 21:24:25,216 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-21 21:24:25,216 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 66 transitions. [2020-12-21 21:24:25,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-21 21:24:25,218 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:25,218 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:25,432 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:24:25,433 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:25,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:25,434 INFO L82 PathProgramCache]: Analyzing trace with hash 1417844485, now seen corresponding path program 5 times [2020-12-21 21:24:25,435 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:25,435 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090895822] [2020-12-21 21:24:25,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:25,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:25,536 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-21 21:24:25,536 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090895822] [2020-12-21 21:24:25,536 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49087043] [2020-12-21 21:24:25,537 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 21:24:27,258 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-21 21:24:27,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:27,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:24:27,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:27,407 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2020-12-21 21:24:27,410 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:27,410 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 12 [2020-12-21 21:24:27,412 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006664805] [2020-12-21 21:24:27,414 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:24:27,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:27,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:24:27,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:27,415 INFO L87 Difference]: Start difference. First operand 60 states and 66 transitions. Second operand 12 states. [2020-12-21 21:24:27,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:27,621 INFO L93 Difference]: Finished difference Result 125 states and 142 transitions. [2020-12-21 21:24:27,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:24:27,622 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 57 [2020-12-21 21:24:27,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:27,623 INFO L225 Difference]: With dead ends: 125 [2020-12-21 21:24:27,623 INFO L226 Difference]: Without dead ends: 78 [2020-12-21 21:24:27,624 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 54 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 21:24:27,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-12-21 21:24:27,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 72. [2020-12-21 21:24:27,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-12-21 21:24:27,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 78 transitions. [2020-12-21 21:24:27,633 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 78 transitions. Word has length 57 [2020-12-21 21:24:27,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:27,633 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 78 transitions. [2020-12-21 21:24:27,633 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:24:27,633 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 78 transitions. [2020-12-21 21:24:27,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-12-21 21:24:27,634 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:27,635 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:27,848 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:27,849 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:27,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:27,850 INFO L82 PathProgramCache]: Analyzing trace with hash -371467719, now seen corresponding path program 6 times [2020-12-21 21:24:27,851 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:27,851 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1732740338] [2020-12-21 21:24:27,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:27,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:27,999 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2020-12-21 21:24:27,999 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1732740338] [2020-12-21 21:24:28,000 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1420427348] [2020-12-21 21:24:28,000 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 21:24:28,404 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-21 21:24:28,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:28,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:24:28,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:28,525 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-21 21:24:28,525 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:28,526 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 14 [2020-12-21 21:24:28,526 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628792200] [2020-12-21 21:24:28,527 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-21 21:24:28,527 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:28,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-21 21:24:28,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:24:28,528 INFO L87 Difference]: Start difference. First operand 72 states and 78 transitions. Second operand 14 states. [2020-12-21 21:24:28,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:28,743 INFO L93 Difference]: Finished difference Result 147 states and 164 transitions. [2020-12-21 21:24:28,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-21 21:24:28,743 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 69 [2020-12-21 21:24:28,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:28,747 INFO L225 Difference]: With dead ends: 147 [2020-12-21 21:24:28,748 INFO L226 Difference]: Without dead ends: 90 [2020-12-21 21:24:28,752 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:24:28,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-12-21 21:24:28,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2020-12-21 21:24:28,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-12-21 21:24:28,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2020-12-21 21:24:28,778 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 69 [2020-12-21 21:24:28,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:28,778 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2020-12-21 21:24:28,778 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-21 21:24:28,778 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2020-12-21 21:24:28,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-12-21 21:24:28,783 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:28,783 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:28,999 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:29,000 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:29,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:29,001 INFO L82 PathProgramCache]: Analyzing trace with hash -2082029715, now seen corresponding path program 7 times [2020-12-21 21:24:29,002 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:29,003 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290398036] [2020-12-21 21:24:29,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:29,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:29,234 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-12-21 21:24:29,235 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290398036] [2020-12-21 21:24:29,239 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1524284542] [2020-12-21 21:24:29,240 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 21:24:29,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:29,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:24:29,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:29,428 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-12-21 21:24:29,428 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:29,428 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 21:24:29,432 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504297070] [2020-12-21 21:24:29,433 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:24:29,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:29,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:24:29,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:24:29,434 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand 11 states. [2020-12-21 21:24:29,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:29,479 INFO L93 Difference]: Finished difference Result 154 states and 166 transitions. [2020-12-21 21:24:29,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:24:29,480 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 81 [2020-12-21 21:24:29,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:29,481 INFO L225 Difference]: With dead ends: 154 [2020-12-21 21:24:29,481 INFO L226 Difference]: Without dead ends: 87 [2020-12-21 21:24:29,482 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 81 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 21:24:29,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-12-21 21:24:29,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2020-12-21 21:24:29,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-12-21 21:24:29,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 92 transitions. [2020-12-21 21:24:29,489 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 92 transitions. Word has length 81 [2020-12-21 21:24:29,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:29,490 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 92 transitions. [2020-12-21 21:24:29,490 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:24:29,490 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 92 transitions. [2020-12-21 21:24:29,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-12-21 21:24:29,491 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:29,491 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:29,704 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:24:29,705 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:29,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:29,706 INFO L82 PathProgramCache]: Analyzing trace with hash 1792466603, now seen corresponding path program 8 times [2020-12-21 21:24:29,706 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:29,707 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271887206] [2020-12-21 21:24:29,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:29,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:29,874 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-12-21 21:24:29,875 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271887206] [2020-12-21 21:24:29,875 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [716940913] [2020-12-21 21:24:29,875 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 21:24:29,971 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:29,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:29,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:24:29,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:30,119 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-12-21 21:24:30,119 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:30,119 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-21 21:24:30,120 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48626902] [2020-12-21 21:24:30,120 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:24:30,120 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:30,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:24:30,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:30,121 INFO L87 Difference]: Start difference. First operand 86 states and 92 transitions. Second operand 12 states. [2020-12-21 21:24:30,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:30,164 INFO L93 Difference]: Finished difference Result 156 states and 168 transitions. [2020-12-21 21:24:30,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 21:24:30,164 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 83 [2020-12-21 21:24:30,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:30,165 INFO L225 Difference]: With dead ends: 156 [2020-12-21 21:24:30,165 INFO L226 Difference]: Without dead ends: 89 [2020-12-21 21:24:30,166 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:30,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-12-21 21:24:30,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2020-12-21 21:24:30,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-12-21 21:24:30,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 94 transitions. [2020-12-21 21:24:30,173 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 94 transitions. Word has length 83 [2020-12-21 21:24:30,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:30,174 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 94 transitions. [2020-12-21 21:24:30,174 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:24:30,174 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 94 transitions. [2020-12-21 21:24:30,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-12-21 21:24:30,175 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:30,175 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:30,388 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:30,389 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:30,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:30,390 INFO L82 PathProgramCache]: Analyzing trace with hash 1446782569, now seen corresponding path program 9 times [2020-12-21 21:24:30,390 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:30,390 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795180151] [2020-12-21 21:24:30,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:30,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:30,560 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-12-21 21:24:30,560 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795180151] [2020-12-21 21:24:30,561 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1281925314] [2020-12-21 21:24:30,561 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 21:24:31,502 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-21 21:24:31,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:31,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 21:24:31,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:31,674 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2020-12-21 21:24:31,674 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:31,674 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 18 [2020-12-21 21:24:31,675 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593228939] [2020-12-21 21:24:31,675 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:24:31,675 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:31,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:24:31,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=213, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:24:31,677 INFO L87 Difference]: Start difference. First operand 88 states and 94 transitions. Second operand 18 states. [2020-12-21 21:24:31,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:31,919 INFO L93 Difference]: Finished difference Result 173 states and 190 transitions. [2020-12-21 21:24:31,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:24:31,921 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 85 [2020-12-21 21:24:31,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:31,922 INFO L225 Difference]: With dead ends: 173 [2020-12-21 21:24:31,922 INFO L226 Difference]: Without dead ends: 106 [2020-12-21 21:24:31,923 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 80 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 21:24:31,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-12-21 21:24:31,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 100. [2020-12-21 21:24:31,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-12-21 21:24:31,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 106 transitions. [2020-12-21 21:24:31,932 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 106 transitions. Word has length 85 [2020-12-21 21:24:31,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:31,932 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 106 transitions. [2020-12-21 21:24:31,932 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:24:31,932 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 106 transitions. [2020-12-21 21:24:31,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-12-21 21:24:31,933 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:31,934 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:32,147 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:32,148 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:32,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:32,150 INFO L82 PathProgramCache]: Analyzing trace with hash -137686115, now seen corresponding path program 10 times [2020-12-21 21:24:32,150 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:32,151 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451895488] [2020-12-21 21:24:32,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:32,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:32,310 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2020-12-21 21:24:32,310 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451895488] [2020-12-21 21:24:32,310 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675671612] [2020-12-21 21:24:32,310 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 21:24:32,411 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:32,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:32,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 21:24:32,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:32,620 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked. [2020-12-21 21:24:32,621 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:32,621 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 20 [2020-12-21 21:24:32,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940289411] [2020-12-21 21:24:32,622 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-21 21:24:32,622 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:32,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-21 21:24:32,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=267, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:24:32,623 INFO L87 Difference]: Start difference. First operand 100 states and 106 transitions. Second operand 20 states. [2020-12-21 21:24:32,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:32,917 INFO L93 Difference]: Finished difference Result 195 states and 212 transitions. [2020-12-21 21:24:32,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-21 21:24:32,917 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 97 [2020-12-21 21:24:32,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:32,918 INFO L225 Difference]: With dead ends: 195 [2020-12-21 21:24:32,919 INFO L226 Difference]: Without dead ends: 118 [2020-12-21 21:24:32,919 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 91 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 21:24:32,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-12-21 21:24:32,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 112. [2020-12-21 21:24:32,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-12-21 21:24:32,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 118 transitions. [2020-12-21 21:24:32,927 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 118 transitions. Word has length 97 [2020-12-21 21:24:32,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:32,927 INFO L481 AbstractCegarLoop]: Abstraction has 112 states and 118 transitions. [2020-12-21 21:24:32,927 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-21 21:24:32,927 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 118 transitions. [2020-12-21 21:24:32,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-12-21 21:24:32,928 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:32,928 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:33,141 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:24:33,142 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:33,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:33,143 INFO L82 PathProgramCache]: Analyzing trace with hash 2116330193, now seen corresponding path program 11 times [2020-12-21 21:24:33,143 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:33,143 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [567859697] [2020-12-21 21:24:33,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:33,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:33,329 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2020-12-21 21:24:33,330 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [567859697] [2020-12-21 21:24:33,330 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268407015] [2020-12-21 21:24:33,330 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