/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-programs/copysome1-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 22:10:13,978 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 22:10:13,982 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 22:10:14,024 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-21 22:10:14,024 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-21 22:10:14,026 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-21 22:10:14,028 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-21 22:10:14,031 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-21 22:10:14,034 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-21 22:10:14,035 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-21 22:10:14,037 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-21 22:10:14,039 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-21 22:10:14,040 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-21 22:10:14,041 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-21 22:10:14,043 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-21 22:10:14,044 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-21 22:10:14,046 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-21 22:10:14,048 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-21 22:10:14,050 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-21 22:10:14,053 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-21 22:10:14,055 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-21 22:10:14,063 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-21 22:10:14,065 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-21 22:10:14,066 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-21 22:10:14,100 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-21 22:10:14,105 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-21 22:10:14,106 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-21 22:10:14,108 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-21 22:10:14,109 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-21 22:10:14,111 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-21 22:10:14,111 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-21 22:10:14,112 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-21 22:10:14,112 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-21 22:10:14,113 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-21 22:10:14,114 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-21 22:10:14,115 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-21 22:10:14,116 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 22:10:14,146 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 22:10:14,147 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 22:10:14,149 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 22:10:14,149 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 22:10:14,149 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 22:10:14,150 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 22:10:14,150 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 22:10:14,150 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 22:10:14,150 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 22:10:14,151 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 22:10:14,151 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 22:10:14,151 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 22:10:14,151 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 22:10:14,152 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 22:10:14,152 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 22:10:14,152 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 22:10:14,152 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 22:10:14,153 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 22:10:14,153 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 22:10:14,153 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 22:10:14,153 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 22:10:14,154 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 22:10:14,154 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 22:10:14,154 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 22:10:14,154 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 22:10:14,155 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 22:10:14,535 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 22:10:14,561 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 22:10:14,564 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 22:10:14,566 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 22:10:14,567 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 22:10:14,568 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-programs/copysome1-1.i [2020-12-21 22:10:14,644 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a60c13723/98548305d92d40cab40d18bfcc3fee86/FLAG3acfaba75 [2020-12-21 22:10:15,289 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 22:10:15,289 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-programs/copysome1-1.i [2020-12-21 22:10:15,304 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a60c13723/98548305d92d40cab40d18bfcc3fee86/FLAG3acfaba75 [2020-12-21 22:10:15,691 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a60c13723/98548305d92d40cab40d18bfcc3fee86 [2020-12-21 22:10:15,695 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 22:10:15,699 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 22:10:15,704 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 22:10:15,704 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 22:10:15,710 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 22:10:15,712 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 10:10:15" (1/1) ... [2020-12-21 22:10:15,714 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5a377cff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:15, skipping insertion in model container [2020-12-21 22:10:15,714 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 10:10:15" (1/1) ... [2020-12-21 22:10:15,725 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 22:10:15,747 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 22:10:15,939 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-programs/copysome1-1.i[806,819] [2020-12-21 22:10:15,959 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 22:10:15,969 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 22:10:15,985 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-programs/copysome1-1.i[806,819] [2020-12-21 22:10:15,995 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 22:10:16,021 INFO L208 MainTranslator]: Completed translation [2020-12-21 22:10:16,022 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16 WrapperNode [2020-12-21 22:10:16,022 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 22:10:16,024 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 22:10:16,024 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 22:10:16,025 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 22:10:16,035 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:16,046 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:16,073 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 22:10:16,074 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 22:10:16,074 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 22:10:16,074 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 22:10:16,087 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:16,088 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:16,090 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:16,091 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:16,098 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:16,104 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:16,106 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:16,109 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 22:10:16,110 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 22:10:16,110 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 22:10:16,110 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 22:10:16,112 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (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 22:10:16,245 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 22:10:16,246 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 22:10:16,246 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 22:10:16,247 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 22:10:16,247 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 22:10:16,247 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 22:10:16,248 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 22:10:16,582 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 22:10:16,582 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-21 22:10:16,584 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 10:10:16 BoogieIcfgContainer [2020-12-21 22:10:16,584 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 22:10:16,587 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 22:10:16,587 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 22:10:16,592 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 22:10:16,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 10:10:15" (1/3) ... [2020-12-21 22:10:16,593 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@412c8633 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 10:10:16, skipping insertion in model container [2020-12-21 22:10:16,594 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (2/3) ... [2020-12-21 22:10:16,595 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@412c8633 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 10:10:16, skipping insertion in model container [2020-12-21 22:10:16,595 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 10:10:16" (3/3) ... [2020-12-21 22:10:16,597 INFO L111 eAbstractionObserver]: Analyzing ICFG copysome1-1.i [2020-12-21 22:10:16,606 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 22:10:16,613 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 22:10:16,638 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 22:10:16,672 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 22:10:16,673 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 22:10:16,673 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 22:10:16,673 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 22:10:16,673 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 22:10:16,673 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 22:10:16,674 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 22:10:16,674 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 22:10:16,694 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-12-21 22:10:16,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-21 22:10:16,702 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:16,703 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:16,704 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:16,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:16,714 INFO L82 PathProgramCache]: Analyzing trace with hash -2060710478, now seen corresponding path program 1 times [2020-12-21 22:10:16,728 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:16,728 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106646452] [2020-12-21 22:10:16,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:16,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:16,931 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 22:10:16,932 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106646452] [2020-12-21 22:10:16,934 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 22:10:16,934 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-21 22:10:16,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143775409] [2020-12-21 22:10:16,941 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-21 22:10:16,942 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:16,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-21 22:10:16,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-21 22:10:16,963 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-12-21 22:10:16,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:16,986 INFO L93 Difference]: Finished difference Result 36 states and 50 transitions. [2020-12-21 22:10:16,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-21 22:10:16,988 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-12-21 22:10:16,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:16,999 INFO L225 Difference]: With dead ends: 36 [2020-12-21 22:10:16,999 INFO L226 Difference]: Without dead ends: 16 [2020-12-21 22:10:17,005 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-21 22:10:17,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-21 22:10:17,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-12-21 22:10:17,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-21 22:10:17,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2020-12-21 22:10:17,063 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 10 [2020-12-21 22:10:17,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:17,063 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2020-12-21 22:10:17,064 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-21 22:10:17,064 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2020-12-21 22:10:17,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-21 22:10:17,066 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:17,066 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:17,067 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 22:10:17,068 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:17,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:17,074 INFO L82 PathProgramCache]: Analyzing trace with hash 1919336157, now seen corresponding path program 1 times [2020-12-21 22:10:17,074 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:17,075 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20655439] [2020-12-21 22:10:17,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:17,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:17,178 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 22:10:17,179 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20655439] [2020-12-21 22:10:17,179 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 22:10:17,179 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 22:10:17,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877556575] [2020-12-21 22:10:17,185 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 22:10:17,185 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:17,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 22:10:17,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 22:10:17,189 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand 3 states. [2020-12-21 22:10:17,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:17,292 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2020-12-21 22:10:17,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 22:10:17,293 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-12-21 22:10:17,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:17,294 INFO L225 Difference]: With dead ends: 33 [2020-12-21 22:10:17,294 INFO L226 Difference]: Without dead ends: 21 [2020-12-21 22:10:17,298 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 22:10:17,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-21 22:10:17,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-12-21 22:10:17,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-21 22:10:17,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2020-12-21 22:10:17,316 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 10 [2020-12-21 22:10:17,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:17,317 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2020-12-21 22:10:17,317 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 22:10:17,318 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2020-12-21 22:10:17,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-21 22:10:17,322 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:17,322 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:17,323 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-21 22:10:17,323 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:17,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:17,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1458340319, now seen corresponding path program 1 times [2020-12-21 22:10:17,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:17,325 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687686986] [2020-12-21 22:10:17,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:17,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:17,426 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 22:10:17,427 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [687686986] [2020-12-21 22:10:17,427 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [630229395] [2020-12-21 22:10:17,427 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 22:10:17,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:17,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 22:10:17,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:17,697 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 22:10:17,698 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:17,699 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 22:10:17,700 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311357317] [2020-12-21 22:10:17,701 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 22:10:17,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:17,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 22:10:17,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 22:10:17,708 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 5 states. [2020-12-21 22:10:17,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:17,795 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2020-12-21 22:10:17,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 22:10:17,796 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-12-21 22:10:17,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:17,797 INFO L225 Difference]: With dead ends: 39 [2020-12-21 22:10:17,798 INFO L226 Difference]: Without dead ends: 26 [2020-12-21 22:10:17,799 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 15 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 22:10:17,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-21 22:10:17,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2020-12-21 22:10:17,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-21 22:10:17,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2020-12-21 22:10:17,805 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 15 [2020-12-21 22:10:17,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:17,805 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2020-12-21 22:10:17,805 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 22:10:17,806 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2020-12-21 22:10:17,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-12-21 22:10:17,806 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:17,807 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:18,020 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-21 22:10:18,021 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:18,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:18,023 INFO L82 PathProgramCache]: Analyzing trace with hash -2030845279, now seen corresponding path program 2 times [2020-12-21 22:10:18,023 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:18,024 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [823674646] [2020-12-21 22:10:18,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:18,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:18,113 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 22:10:18,114 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [823674646] [2020-12-21 22:10:18,114 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130185480] [2020-12-21 22:10:18,114 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 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 22:10:18,187 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 22:10:18,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:18,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 22:10:18,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:18,234 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 22:10:18,235 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:18,235 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-21 22:10:18,235 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663268781] [2020-12-21 22:10:18,236 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-21 22:10:18,236 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:18,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-21 22:10:18,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 22:10:18,238 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand 6 states. [2020-12-21 22:10:18,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:18,307 INFO L93 Difference]: Finished difference Result 47 states and 60 transitions. [2020-12-21 22:10:18,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-21 22:10:18,307 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-12-21 22:10:18,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:18,308 INFO L225 Difference]: With dead ends: 47 [2020-12-21 22:10:18,308 INFO L226 Difference]: Without dead ends: 31 [2020-12-21 22:10:18,309 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 20 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 22:10:18,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-21 22:10:18,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-12-21 22:10:18,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-21 22:10:18,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-12-21 22:10:18,316 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 20 [2020-12-21 22:10:18,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:18,316 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-12-21 22:10:18,316 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-21 22:10:18,317 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-12-21 22:10:18,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-21 22:10:18,318 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:18,318 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:18,532 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:18,533 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:18,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:18,535 INFO L82 PathProgramCache]: Analyzing trace with hash -224231843, now seen corresponding path program 3 times [2020-12-21 22:10:18,535 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:18,536 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218840289] [2020-12-21 22:10:18,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:18,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:18,643 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-21 22:10:18,644 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218840289] [2020-12-21 22:10:18,645 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805271549] [2020-12-21 22:10:18,645 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 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 22:10:18,722 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-21 22:10:18,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:18,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 22:10:18,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:18,787 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-21 22:10:18,787 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:18,788 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-21 22:10:18,788 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560151671] [2020-12-21 22:10:18,788 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 22:10:18,789 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:18,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 22:10:18,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 22:10:18,790 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 7 states. [2020-12-21 22:10:18,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:18,875 INFO L93 Difference]: Finished difference Result 55 states and 70 transitions. [2020-12-21 22:10:18,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-21 22:10:18,876 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-12-21 22:10:18,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:18,877 INFO L225 Difference]: With dead ends: 55 [2020-12-21 22:10:18,877 INFO L226 Difference]: Without dead ends: 36 [2020-12-21 22:10:18,878 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 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 22:10:18,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-21 22:10:18,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2020-12-21 22:10:18,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-21 22:10:18,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2020-12-21 22:10:18,885 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 25 [2020-12-21 22:10:18,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:18,885 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2020-12-21 22:10:18,886 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 22:10:18,886 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2020-12-21 22:10:18,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-21 22:10:18,887 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:18,887 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:19,100 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:19,101 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:19,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:19,103 INFO L82 PathProgramCache]: Analyzing trace with hash -736833947, now seen corresponding path program 4 times [2020-12-21 22:10:19,103 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:19,104 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713721456] [2020-12-21 22:10:19,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:19,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:19,191 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-12-21 22:10:19,191 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713721456] [2020-12-21 22:10:19,191 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975369391] [2020-12-21 22:10:19,192 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 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 22:10:19,279 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 22:10:19,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:19,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 22:10:19,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:19,366 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-12-21 22:10:19,367 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:19,367 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-21 22:10:19,367 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186742730] [2020-12-21 22:10:19,367 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-21 22:10:19,368 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:19,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-21 22:10:19,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 22:10:19,369 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand 8 states. [2020-12-21 22:10:19,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:19,447 INFO L93 Difference]: Finished difference Result 63 states and 80 transitions. [2020-12-21 22:10:19,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 22:10:19,447 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 30 [2020-12-21 22:10:19,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:19,448 INFO L225 Difference]: With dead ends: 63 [2020-12-21 22:10:19,448 INFO L226 Difference]: Without dead ends: 41 [2020-12-21 22:10:19,449 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 30 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 22:10:19,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-21 22:10:19,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-12-21 22:10:19,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-21 22:10:19,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-12-21 22:10:19,455 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 30 [2020-12-21 22:10:19,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:19,455 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-12-21 22:10:19,455 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-21 22:10:19,456 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-12-21 22:10:19,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-12-21 22:10:19,457 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:19,457 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:19,671 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:19,672 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:19,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:19,673 INFO L82 PathProgramCache]: Analyzing trace with hash 1407538841, now seen corresponding path program 5 times [2020-12-21 22:10:19,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:19,674 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [982916058] [2020-12-21 22:10:19,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:19,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:19,815 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2020-12-21 22:10:19,816 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [982916058] [2020-12-21 22:10:19,816 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801555323] [2020-12-21 22:10:19,816 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 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 22:10:20,035 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-21 22:10:20,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:20,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 22:10:20,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:20,097 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2020-12-21 22:10:20,098 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:20,098 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-21 22:10:20,098 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301783640] [2020-12-21 22:10:20,098 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-21 22:10:20,099 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:20,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-21 22:10:20,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 22:10:20,100 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 9 states. [2020-12-21 22:10:20,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:20,200 INFO L93 Difference]: Finished difference Result 71 states and 90 transitions. [2020-12-21 22:10:20,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-21 22:10:20,201 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2020-12-21 22:10:20,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:20,202 INFO L225 Difference]: With dead ends: 71 [2020-12-21 22:10:20,202 INFO L226 Difference]: Without dead ends: 46 [2020-12-21 22:10:20,203 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 22:10:20,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-21 22:10:20,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2020-12-21 22:10:20,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-12-21 22:10:20,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2020-12-21 22:10:20,209 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 35 [2020-12-21 22:10:20,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:20,210 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2020-12-21 22:10:20,210 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-21 22:10:20,210 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2020-12-21 22:10:20,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-12-21 22:10:20,211 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:20,211 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:20,424 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-12-21 22:10:20,424 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:20,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:20,425 INFO L82 PathProgramCache]: Analyzing trace with hash 968499753, now seen corresponding path program 6 times [2020-12-21 22:10:20,426 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:20,426 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540704942] [2020-12-21 22:10:20,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:20,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:20,552 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2020-12-21 22:10:20,553 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540704942] [2020-12-21 22:10:20,553 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735038983] [2020-12-21 22:10:20,553 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 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 22:10:20,815 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-21 22:10:20,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:20,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 22:10:20,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:20,913 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 22:10:20,914 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:20,914 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-21 22:10:20,914 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416018384] [2020-12-21 22:10:20,915 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 22:10:20,915 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:20,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 22:10:20,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 22:10:20,916 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand 10 states. [2020-12-21 22:10:21,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:21,036 INFO L93 Difference]: Finished difference Result 79 states and 100 transitions. [2020-12-21 22:10:21,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 22:10:21,037 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 40 [2020-12-21 22:10:21,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:21,038 INFO L225 Difference]: With dead ends: 79 [2020-12-21 22:10:21,038 INFO L226 Difference]: Without dead ends: 51 [2020-12-21 22:10:21,038 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 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 22:10:21,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-12-21 22:10:21,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-12-21 22:10:21,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-12-21 22:10:21,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 58 transitions. [2020-12-21 22:10:21,046 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 58 transitions. Word has length 40 [2020-12-21 22:10:21,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:21,046 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 58 transitions. [2020-12-21 22:10:21,046 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 22:10:21,046 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 58 transitions. [2020-12-21 22:10:21,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-21 22:10:21,048 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:21,048 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:21,263 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:21,264 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:21,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:21,265 INFO L82 PathProgramCache]: Analyzing trace with hash -1016346923, now seen corresponding path program 7 times [2020-12-21 22:10:21,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:21,266 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987903200] [2020-12-21 22:10:21,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:21,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:21,406 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-12-21 22:10:21,407 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987903200] [2020-12-21 22:10:21,407 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [854676488] [2020-12-21 22:10:21,407 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 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 22:10:21,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:21,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 22:10:21,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:21,547 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-12-21 22:10:21,547 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:21,548 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 22:10:21,548 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501185429] [2020-12-21 22:10:21,548 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 22:10:21,549 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:21,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 22:10:21,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 22:10:21,550 INFO L87 Difference]: Start difference. First operand 48 states and 58 transitions. Second operand 11 states. [2020-12-21 22:10:21,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:21,668 INFO L93 Difference]: Finished difference Result 87 states and 110 transitions. [2020-12-21 22:10:21,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 22:10:21,669 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-12-21 22:10:21,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:21,670 INFO L225 Difference]: With dead ends: 87 [2020-12-21 22:10:21,670 INFO L226 Difference]: Without dead ends: 56 [2020-12-21 22:10:21,671 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 45 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 22:10:21,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-21 22:10:21,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2020-12-21 22:10:21,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-21 22:10:21,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 64 transitions. [2020-12-21 22:10:21,677 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 64 transitions. Word has length 45 [2020-12-21 22:10:21,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:21,678 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 64 transitions. [2020-12-21 22:10:21,678 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 22:10:21,678 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 64 transitions. [2020-12-21 22:10:21,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-12-21 22:10:21,679 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:21,680 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:21,893 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:21,894 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:21,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:21,895 INFO L82 PathProgramCache]: Analyzing trace with hash -1143734803, now seen corresponding path program 8 times [2020-12-21 22:10:21,895 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:21,896 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444490952] [2020-12-21 22:10:21,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:21,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:22,096 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2020-12-21 22:10:22,097 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444490952] [2020-12-21 22:10:22,097 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [289345649] [2020-12-21 22:10:22,097 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 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 22:10:22,179 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 22:10:22,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:22,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 22:10:22,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:22,267 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2020-12-21 22:10:22,268 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:22,268 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-21 22:10:22,268 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701404633] [2020-12-21 22:10:22,269 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 22:10:22,269 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:22,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 22:10:22,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 22:10:22,270 INFO L87 Difference]: Start difference. First operand 53 states and 64 transitions. Second operand 12 states. [2020-12-21 22:10:22,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:22,397 INFO L93 Difference]: Finished difference Result 95 states and 120 transitions. [2020-12-21 22:10:22,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 22:10:22,398 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 50 [2020-12-21 22:10:22,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:22,400 INFO L225 Difference]: With dead ends: 95 [2020-12-21 22:10:22,400 INFO L226 Difference]: Without dead ends: 61 [2020-12-21 22:10:22,402 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 50 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 22:10:22,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-12-21 22:10:22,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-12-21 22:10:22,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-12-21 22:10:22,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 70 transitions. [2020-12-21 22:10:22,418 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 70 transitions. Word has length 50 [2020-12-21 22:10:22,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:22,418 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 70 transitions. [2020-12-21 22:10:22,419 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 22:10:22,419 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 70 transitions. [2020-12-21 22:10:22,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-12-21 22:10:22,420 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:22,420 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:22,634 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-12-21 22:10:22,635 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:22,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:22,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1908772625, now seen corresponding path program 9 times [2020-12-21 22:10:22,636 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:22,637 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889491971] [2020-12-21 22:10:22,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:22,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:22,768 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2020-12-21 22:10:22,769 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889491971] [2020-12-21 22:10:22,769 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [629068641] [2020-12-21 22:10:22,769 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 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 22:10:24,576 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-12-21 22:10:24,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:24,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-21 22:10:24,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:24,665 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2020-12-21 22:10:24,665 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:24,665 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-21 22:10:24,666 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045328089] [2020-12-21 22:10:24,666 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-21 22:10:24,666 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:24,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-21 22:10:24,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 22:10:24,667 INFO L87 Difference]: Start difference. First operand 58 states and 70 transitions. Second operand 13 states. [2020-12-21 22:10:24,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:24,798 INFO L93 Difference]: Finished difference Result 103 states and 130 transitions. [2020-12-21 22:10:24,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 22:10:24,799 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 55 [2020-12-21 22:10:24,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:24,800 INFO L225 Difference]: With dead ends: 103 [2020-12-21 22:10:24,800 INFO L226 Difference]: Without dead ends: 66 [2020-12-21 22:10:24,801 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 22:10:24,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-21 22:10:24,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 63. [2020-12-21 22:10:24,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-12-21 22:10:24,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2020-12-21 22:10:24,809 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 55 [2020-12-21 22:10:24,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:24,810 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2020-12-21 22:10:24,810 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-21 22:10:24,810 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2020-12-21 22:10:24,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-12-21 22:10:24,811 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:24,811 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:25,025 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:25,026 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:25,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:25,027 INFO L82 PathProgramCache]: Analyzing trace with hash -967663183, now seen corresponding path program 10 times [2020-12-21 22:10:25,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:25,028 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906836535] [2020-12-21 22:10:25,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:25,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:25,222 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-12-21 22:10:25,223 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906836535] [2020-12-21 22:10:25,223 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [644672619] [2020-12-21 22:10:25,223 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 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 22:10:25,378 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 22:10:25,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:25,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-21 22:10:25,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:25,453 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-12-21 22:10:25,454 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:25,454 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-21 22:10:25,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31408326] [2020-12-21 22:10:25,455 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-21 22:10:25,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:25,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-21 22:10:25,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 22:10:25,456 INFO L87 Difference]: Start difference. First operand 63 states and 76 transitions. Second operand 14 states. [2020-12-21 22:10:25,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:25,617 INFO L93 Difference]: Finished difference Result 111 states and 140 transitions. [2020-12-21 22:10:25,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-21 22:10:25,618 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 60 [2020-12-21 22:10:25,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:25,619 INFO L225 Difference]: With dead ends: 111 [2020-12-21 22:10:25,619 INFO L226 Difference]: Without dead ends: 71 [2020-12-21 22:10:25,619 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 22:10:25,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-12-21 22:10:25,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-12-21 22:10:25,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-21 22:10:25,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 82 transitions. [2020-12-21 22:10:25,625 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 82 transitions. Word has length 60 [2020-12-21 22:10:25,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:25,625 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 82 transitions. [2020-12-21 22:10:25,625 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-21 22:10:25,625 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 82 transitions. [2020-12-21 22:10:25,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-12-21 22:10:25,626 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:25,627 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:25,840 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:25,841 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:25,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:25,842 INFO L82 PathProgramCache]: Analyzing trace with hash -2055049395, now seen corresponding path program 11 times [2020-12-21 22:10:25,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:25,843 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562702933] [2020-12-21 22:10:25,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:25,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:26,040 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2020-12-21 22:10:26,041 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562702933] [2020-12-21 22:10:26,041 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1721202497] [2020-12-21 22:10:26,041 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 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 22:10:55,360 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-12-21 22:10:55,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:55,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 22:10:55,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:55,477 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2020-12-21 22:10:55,477 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:55,492 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-21 22:10:55,493 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280205236] [2020-12-21 22:10:55,496 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 22:10:55,497 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:55,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 22:10:55,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 22:10:55,498 INFO L87 Difference]: Start difference. First operand 68 states and 82 transitions. Second operand 15 states. [2020-12-21 22:10:55,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:55,658 INFO L93 Difference]: Finished difference Result 119 states and 150 transitions. [2020-12-21 22:10:55,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-21 22:10:55,659 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 65 [2020-12-21 22:10:55,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:55,660 INFO L225 Difference]: With dead ends: 119 [2020-12-21 22:10:55,660 INFO L226 Difference]: Without dead ends: 76 [2020-12-21 22:10:55,661 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 22:10:55,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-12-21 22:10:55,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 73. [2020-12-21 22:10:55,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-12-21 22:10:55,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 88 transitions. [2020-12-21 22:10:55,680 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 88 transitions. Word has length 65 [2020-12-21 22:10:55,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:55,681 INFO L481 AbstractCegarLoop]: Abstraction has 73 states and 88 transitions. [2020-12-21 22:10:55,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 22:10:55,681 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 88 transitions. [2020-12-21 22:10:55,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-12-21 22:10:55,685 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:55,685 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:55,886 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 22:10:55,886 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:55,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:55,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1898335605, now seen corresponding path program 12 times [2020-12-21 22:10:55,887 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:55,888 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806277429] [2020-12-21 22:10:55,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:55,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:56,065 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2020-12-21 22:10:56,066 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [806277429] [2020-12-21 22:10:56,066 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401538328] [2020-12-21 22:10:56,066 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 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 22:11:07,521 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-21 22:11:07,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:11:07,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 33 conjunts are in the unsatisfiable core [2020-12-21 22:11:07,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:11:07,683 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 23 proven. 210 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-21 22:11:07,683 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:11:07,683 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17] total 18 [2020-12-21 22:11:07,684 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732190230] [2020-12-21 22:11:07,684 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 22:11:07,684 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:11:07,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 22:11:07,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 22:11:07,686 INFO L87 Difference]: Start difference. First operand 73 states and 88 transitions. Second operand 18 states. [2020-12-21 22:11:07,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:11:07,874 INFO L93 Difference]: Finished difference Result 129 states and 164 transitions. [2020-12-21 22:11:07,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 22:11:07,874 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 70 [2020-12-21 22:11:07,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:11:07,875 INFO L225 Difference]: With dead ends: 129 [2020-12-21 22:11:07,875 INFO L226 Difference]: Without dead ends: 83 [2020-12-21 22:11:07,876 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 22:11:07,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-12-21 22:11:07,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2020-12-21 22:11:07,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-12-21 22:11:07,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 100 transitions. [2020-12-21 22:11:07,880 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 100 transitions. Word has length 70 [2020-12-21 22:11:07,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:11:07,881 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 100 transitions. [2020-12-21 22:11:07,881 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 22:11:07,881 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 100 transitions. [2020-12-21 22:11:07,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-12-21 22:11:07,882 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:11:07,882 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:11:08,097 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 22:11:08,098 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:11:08,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:11:08,099 INFO L82 PathProgramCache]: Analyzing trace with hash -1002487495, now seen corresponding path program 13 times [2020-12-21 22:11:08,099 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:11:08,099 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393369215] [2020-12-21 22:11:08,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:11:08,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:11:08,338 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2020-12-21 22:11:08,339 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393369215] [2020-12-21 22:11:08,339 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1179098521] [2020-12-21 22:11:08,339 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 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 22:11:08,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:11:08,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 22:11:08,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:11:08,566 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2020-12-21 22:11:08,567 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:11:08,567 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-21 22:11:08,567 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777932325] [2020-12-21 22:11:08,568 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 22:11:08,569 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:11:08,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 22:11:08,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 22:11:08,572 INFO L87 Difference]: Start difference. First operand 83 states and 100 transitions. Second operand 18 states. [2020-12-21 22:11:08,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:11:08,786 INFO L93 Difference]: Finished difference Result 143 states and 180 transitions. [2020-12-21 22:11:08,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 22:11:08,786 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 80 [2020-12-21 22:11:08,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:11:08,787 INFO L225 Difference]: With dead ends: 143 [2020-12-21 22:11:08,787 INFO L226 Difference]: Without dead ends: 91 [2020-12-21 22:11:08,788 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 22:11:08,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-12-21 22:11:08,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-12-21 22:11:08,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-12-21 22:11:08,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 106 transitions. [2020-12-21 22:11:08,793 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 106 transitions. Word has length 80 [2020-12-21 22:11:08,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:11:08,793 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 106 transitions. [2020-12-21 22:11:08,793 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 22:11:08,793 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 106 transitions. [2020-12-21 22:11:08,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-12-21 22:11:08,794 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:11:08,794 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:11:09,005 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-12-21 22:11:09,006 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:11:09,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:11:09,007 INFO L82 PathProgramCache]: Analyzing trace with hash -1385924667, now seen corresponding path program 14 times [2020-12-21 22:11:09,007 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:11:09,008 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [334707627] [2020-12-21 22:11:09,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:11:09,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:11:09,239 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2020-12-21 22:11:09,240 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [334707627] [2020-12-21 22:11:09,240 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569920258] [2020-12-21 22:11:09,240 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 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 22:11:09,332 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 22:11:09,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:11:09,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-21 22:11:09,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:11:09,436 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2020-12-21 22:11:09,437 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:11:09,437 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-21 22:11:09,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586519173] [2020-12-21 22:11:09,438 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-21 22:11:09,438 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:11:09,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-21 22:11:09,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 22:11:09,439 INFO L87 Difference]: Start difference. First operand 88 states and 106 transitions. Second operand 19 states. [2020-12-21 22:11:09,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:11:09,651 INFO L93 Difference]: Finished difference Result 151 states and 190 transitions. [2020-12-21 22:11:09,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 22:11:09,651 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 85 [2020-12-21 22:11:09,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:11:09,652 INFO L225 Difference]: With dead ends: 151 [2020-12-21 22:11:09,652 INFO L226 Difference]: Without dead ends: 96 [2020-12-21 22:11:09,653 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 85 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 22:11:09,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-12-21 22:11:09,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 93. [2020-12-21 22:11:09,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-12-21 22:11:09,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 112 transitions. [2020-12-21 22:11:09,658 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 112 transitions. Word has length 85 [2020-12-21 22:11:09,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:11:09,658 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 112 transitions. [2020-12-21 22:11:09,658 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-21 22:11:09,658 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 112 transitions. [2020-12-21 22:11:09,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-12-21 22:11:09,659 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:11:09,659 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:11:09,873 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:11:09,874 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:11:09,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:11:09,875 INFO L82 PathProgramCache]: Analyzing trace with hash -74597123, now seen corresponding path program 15 times [2020-12-21 22:11:09,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:11:09,875 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730690728] [2020-12-21 22:11:09,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:11:09,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:11:10,149 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2020-12-21 22:11:10,149 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730690728] [2020-12-21 22:11:10,150 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152082092] [2020-12-21 22:11:10,150 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 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 22:11:44,035 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2020-12-21 22:11:44,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:11:44,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-21 22:11:44,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:11:44,177 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2020-12-21 22:11:44,178 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:11:44,178 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-21 22:11:44,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107848718] [2020-12-21 22:11:44,178 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-21 22:11:44,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:11:44,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-21 22:11:44,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 22:11:44,180 INFO L87 Difference]: Start difference. First operand 93 states and 112 transitions. Second operand 20 states. [2020-12-21 22:11:44,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:11:44,419 INFO L93 Difference]: Finished difference Result 159 states and 200 transitions. [2020-12-21 22:11:44,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-21 22:11:44,419 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 90 [2020-12-21 22:11:44,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:11:44,420 INFO L225 Difference]: With dead ends: 159 [2020-12-21 22:11:44,420 INFO L226 Difference]: Without dead ends: 101 [2020-12-21 22:11:44,423 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 22:11:44,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-12-21 22:11:44,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 98. [2020-12-21 22:11:44,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-12-21 22:11:44,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 118 transitions. [2020-12-21 22:11:44,430 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 118 transitions. Word has length 90 [2020-12-21 22:11:44,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:11:44,430 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 118 transitions. [2020-12-21 22:11:44,430 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-21 22:11:44,430 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 118 transitions. [2020-12-21 22:11:44,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-12-21 22:11:44,431 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:11:44,431 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:11:44,632 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 22:11:44,632 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:11:44,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:11:44,633 INFO L82 PathProgramCache]: Analyzing trace with hash 2024349697, now seen corresponding path program 16 times [2020-12-21 22:11:44,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:11:44,634 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862716764] [2020-12-21 22:11:44,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:11:44,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:11:44,894 INFO L134 CoverageAnalysis]: Checked inductivity of 714 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2020-12-21 22:11:44,894 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862716764] [2020-12-21 22:11:44,895 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259270754] [2020-12-21 22:11:44,895 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 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 22:11:45,287 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 22:11:45,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:11:45,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-21 22:11:45,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:11:45,414 INFO L134 CoverageAnalysis]: Checked inductivity of 714 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2020-12-21 22:11:45,415 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:11:45,415 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-21 22:11:45,415 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643758029] [2020-12-21 22:11:45,416 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-21 22:11:45,416 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:11:45,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-21 22:11:45,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 22:11:45,417 INFO L87 Difference]: Start difference. First operand 98 states and 118 transitions. Second operand 21 states. [2020-12-21 22:11:45,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:11:45,626 INFO L93 Difference]: Finished difference Result 167 states and 210 transitions. [2020-12-21 22:11:45,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-21 22:11:45,627 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 95 [2020-12-21 22:11:45,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:11:45,628 INFO L225 Difference]: With dead ends: 167 [2020-12-21 22:11:45,628 INFO L226 Difference]: Without dead ends: 106 [2020-12-21 22:11:45,629 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 22:11:45,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-12-21 22:11:45,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 103. [2020-12-21 22:11:45,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-12-21 22:11:45,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 124 transitions. [2020-12-21 22:11:45,634 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 124 transitions. Word has length 95 [2020-12-21 22:11:45,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:11:45,634 INFO L481 AbstractCegarLoop]: Abstraction has 103 states and 124 transitions. [2020-12-21 22:11:45,634 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-21 22:11:45,634 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 124 transitions. [2020-12-21 22:11:45,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-12-21 22:11:45,635 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:11:45,635 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:11:45,845 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-21 22:11:45,846 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:11:45,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:11:45,847 INFO L82 PathProgramCache]: Analyzing trace with hash -889061183, now seen corresponding path program 17 times [2020-12-21 22:11:45,847 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:11:45,847 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770048690] [2020-12-21 22:11:45,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:11:45,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:11:46,163 INFO L134 CoverageAnalysis]: Checked inductivity of 801 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2020-12-21 22:11:46,164 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770048690] [2020-12-21 22:11:46,164 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [404498154] [2020-12-21 22:11:46,164 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 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