/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/gcd01-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-89f541c [2020-08-27 21:47:59,110 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-27 21:47:59,114 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-27 21:47:59,140 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-27 21:47:59,141 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-27 21:47:59,142 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-27 21:47:59,145 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-27 21:47:59,148 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-27 21:47:59,156 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-27 21:47:59,159 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-27 21:47:59,160 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-27 21:47:59,161 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-27 21:47:59,162 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-27 21:47:59,163 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-27 21:47:59,167 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-27 21:47:59,168 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-27 21:47:59,170 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-27 21:47:59,174 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-27 21:47:59,177 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-27 21:47:59,181 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-27 21:47:59,184 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-27 21:47:59,186 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-27 21:47:59,188 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-27 21:47:59,188 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-27 21:47:59,201 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-27 21:47:59,218 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-27 21:47:59,219 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-27 21:47:59,220 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-27 21:47:59,221 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-27 21:47:59,271 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-27 21:47:59,271 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-27 21:47:59,273 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-27 21:47:59,274 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-27 21:47:59,274 INFO L138 SettingsManager]: * Use SBE=true [2020-08-27 21:47:59,274 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-27 21:47:59,275 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-27 21:47:59,275 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-27 21:47:59,275 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-27 21:47:59,275 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-27 21:47:59,276 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-27 21:47:59,276 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-27 21:47:59,277 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-27 21:47:59,277 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-27 21:47:59,277 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-27 21:47:59,278 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-27 21:47:59,278 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-27 21:47:59,278 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-27 21:47:59,278 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-27 21:47:59,279 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-27 21:47:59,279 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-27 21:47:59,279 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-27 21:47:59,279 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-27 21:47:59,279 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-27 21:47:59,280 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-27 21:47:59,280 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-27 21:47:59,280 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-27 21:47:59,280 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-27 21:47:59,280 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-27 21:47:59,281 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false [2020-08-27 21:47:59,717 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-27 21:47:59,739 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-27 21:47:59,743 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-27 21:47:59,745 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-27 21:47:59,745 INFO L275 PluginConnector]: CDTParser initialized [2020-08-27 21:47:59,747 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/gcd01-1.c [2020-08-27 21:47:59,825 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/23019052e/fdf7de015ab64d3bb5fa556c8db2beb3/FLAG64a13d77f [2020-08-27 21:48:00,399 INFO L306 CDTParser]: Found 1 translation units. [2020-08-27 21:48:00,400 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/gcd01-1.c [2020-08-27 21:48:00,409 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/23019052e/fdf7de015ab64d3bb5fa556c8db2beb3/FLAG64a13d77f [2020-08-27 21:48:00,735 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/23019052e/fdf7de015ab64d3bb5fa556c8db2beb3 [2020-08-27 21:48:00,749 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-27 21:48:00,751 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-27 21:48:00,752 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-27 21:48:00,752 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-27 21:48:00,755 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-27 21:48:00,756 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.08 09:48:00" (1/1) ... [2020-08-27 21:48:00,760 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30fa97df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:48:00, skipping insertion in model container [2020-08-27 21:48:00,761 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.08 09:48:00" (1/1) ... [2020-08-27 21:48:00,770 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-27 21:48:00,793 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-27 21:48:00,987 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-27 21:48:00,992 INFO L203 MainTranslator]: Completed pre-run [2020-08-27 21:48:01,015 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-27 21:48:01,030 INFO L208 MainTranslator]: Completed translation [2020-08-27 21:48:01,031 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:48:01 WrapperNode [2020-08-27 21:48:01,031 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-27 21:48:01,032 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-27 21:48:01,032 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-27 21:48:01,033 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-27 21:48:01,048 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:48:01" (1/1) ... [2020-08-27 21:48:01,049 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:48:01" (1/1) ... [2020-08-27 21:48:01,147 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:48:01" (1/1) ... [2020-08-27 21:48:01,148 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:48:01" (1/1) ... [2020-08-27 21:48:01,152 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:48:01" (1/1) ... [2020-08-27 21:48:01,155 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:48:01" (1/1) ... [2020-08-27 21:48:01,156 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:48:01" (1/1) ... [2020-08-27 21:48:01,158 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-27 21:48:01,159 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-27 21:48:01,159 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-27 21:48:01,160 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-27 21:48:01,161 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:48:01" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-27 21:48:01,236 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-27 21:48:01,237 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-27 21:48:01,237 INFO L138 BoogieDeclarations]: Found implementation of procedure gcd [2020-08-27 21:48:01,237 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-27 21:48:01,237 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-27 21:48:01,238 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-27 21:48:01,238 INFO L130 BoogieDeclarations]: Found specification of procedure gcd [2020-08-27 21:48:01,238 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-27 21:48:01,238 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-27 21:48:01,238 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-27 21:48:01,467 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-27 21:48:01,467 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-27 21:48:01,472 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 09:48:01 BoogieIcfgContainer [2020-08-27 21:48:01,473 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-27 21:48:01,474 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-27 21:48:01,474 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-27 21:48:01,479 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-27 21:48:01,479 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.08 09:48:00" (1/3) ... [2020-08-27 21:48:01,480 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1302ae26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.08 09:48:01, skipping insertion in model container [2020-08-27 21:48:01,481 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:48:01" (2/3) ... [2020-08-27 21:48:01,481 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1302ae26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.08 09:48:01, skipping insertion in model container [2020-08-27 21:48:01,481 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 09:48:01" (3/3) ... [2020-08-27 21:48:01,484 INFO L109 eAbstractionObserver]: Analyzing ICFG gcd01-1.c [2020-08-27 21:48:01,497 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-27 21:48:01,511 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-27 21:48:01,538 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-27 21:48:01,577 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-27 21:48:01,578 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-27 21:48:01,578 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-27 21:48:01,578 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-27 21:48:01,578 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-27 21:48:01,579 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-27 21:48:01,579 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-27 21:48:01,579 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-27 21:48:01,606 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-08-27 21:48:01,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-27 21:48:01,615 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:48:01,616 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:48:01,617 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:48:01,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:48:01,627 INFO L82 PathProgramCache]: Analyzing trace with hash -1001932622, now seen corresponding path program 1 times [2020-08-27 21:48:01,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:48:01,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1437089747] [2020-08-27 21:48:01,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:48:01,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:01,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:48:01,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:01,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-27 21:48:01,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:01,944 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:48:01,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1437089747] [2020-08-27 21:48:01,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:48:01,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-27 21:48:01,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296590379] [2020-08-27 21:48:01,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-27 21:48:01,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:48:01,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-27 21:48:01,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-27 21:48:01,979 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 6 states. [2020-08-27 21:48:02,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:48:02,126 INFO L93 Difference]: Finished difference Result 40 states and 49 transitions. [2020-08-27 21:48:02,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-27 21:48:02,128 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-27 21:48:02,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:48:02,142 INFO L225 Difference]: With dead ends: 40 [2020-08-27 21:48:02,143 INFO L226 Difference]: Without dead ends: 24 [2020-08-27 21:48:02,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-27 21:48:02,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-27 21:48:02,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-27 21:48:02,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-27 21:48:02,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-08-27 21:48:02,210 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 15 [2020-08-27 21:48:02,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:48:02,211 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-08-27 21:48:02,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-27 21:48:02,211 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-08-27 21:48:02,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-27 21:48:02,213 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:48:02,214 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:48:02,214 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-27 21:48:02,214 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:48:02,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:48:02,215 INFO L82 PathProgramCache]: Analyzing trace with hash -423841111, now seen corresponding path program 1 times [2020-08-27 21:48:02,215 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:48:02,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [688659409] [2020-08-27 21:48:02,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:48:02,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:02,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:48:02,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:02,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-27 21:48:02,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:02,338 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:48:02,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [688659409] [2020-08-27 21:48:02,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:48:02,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-27 21:48:02,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754101929] [2020-08-27 21:48:02,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-27 21:48:02,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:48:02,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-27 21:48:02,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-27 21:48:02,343 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 7 states. [2020-08-27 21:48:02,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:48:02,434 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2020-08-27 21:48:02,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-27 21:48:02,435 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-27 21:48:02,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:48:02,436 INFO L225 Difference]: With dead ends: 30 [2020-08-27 21:48:02,436 INFO L226 Difference]: Without dead ends: 26 [2020-08-27 21:48:02,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-27 21:48:02,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-27 21:48:02,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2020-08-27 21:48:02,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-27 21:48:02,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-08-27 21:48:02,446 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 16 [2020-08-27 21:48:02,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:48:02,447 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-08-27 21:48:02,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-27 21:48:02,447 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-08-27 21:48:02,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-27 21:48:02,450 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:48:02,450 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:48:02,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-27 21:48:02,451 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:48:02,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:48:02,451 INFO L82 PathProgramCache]: Analyzing trace with hash -1280495258, now seen corresponding path program 1 times [2020-08-27 21:48:02,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:48:02,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089184965] [2020-08-27 21:48:02,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:48:02,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:02,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:48:02,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:02,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-27 21:48:02,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:02,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-08-27 21:48:02,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:02,662 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-27 21:48:02,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089184965] [2020-08-27 21:48:02,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:48:02,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-27 21:48:02,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957009953] [2020-08-27 21:48:02,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-27 21:48:02,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:48:02,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-27 21:48:02,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-27 21:48:02,665 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 7 states. [2020-08-27 21:48:02,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:48:02,824 INFO L93 Difference]: Finished difference Result 36 states and 45 transitions. [2020-08-27 21:48:02,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-27 21:48:02,824 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-08-27 21:48:02,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:48:02,826 INFO L225 Difference]: With dead ends: 36 [2020-08-27 21:48:02,826 INFO L226 Difference]: Without dead ends: 28 [2020-08-27 21:48:02,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-08-27 21:48:02,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-27 21:48:02,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-08-27 21:48:02,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-27 21:48:02,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2020-08-27 21:48:02,836 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 23 [2020-08-27 21:48:02,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:48:02,836 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2020-08-27 21:48:02,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-27 21:48:02,837 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2020-08-27 21:48:02,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-27 21:48:02,838 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:48:02,838 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:48:02,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-27 21:48:02,839 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:48:02,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:48:02,839 INFO L82 PathProgramCache]: Analyzing trace with hash 1668712292, now seen corresponding path program 1 times [2020-08-27 21:48:02,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:48:02,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [114168534] [2020-08-27 21:48:02,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:48:02,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:02,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:48:02,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:02,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-27 21:48:02,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:02,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-08-27 21:48:02,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:02,968 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-27 21:48:02,969 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [114168534] [2020-08-27 21:48:02,969 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:48:02,969 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-27 21:48:02,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404584078] [2020-08-27 21:48:02,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-27 21:48:02,970 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:48:02,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-27 21:48:02,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-27 21:48:02,971 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand 8 states. [2020-08-27 21:48:03,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:48:03,113 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-27 21:48:03,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-27 21:48:03,113 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-27 21:48:03,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:48:03,114 INFO L225 Difference]: With dead ends: 36 [2020-08-27 21:48:03,115 INFO L226 Difference]: Without dead ends: 26 [2020-08-27 21:48:03,116 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2020-08-27 21:48:03,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-27 21:48:03,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2020-08-27 21:48:03,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-27 21:48:03,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2020-08-27 21:48:03,123 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 23 [2020-08-27 21:48:03,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:48:03,123 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2020-08-27 21:48:03,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-27 21:48:03,123 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2020-08-27 21:48:03,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-27 21:48:03,125 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:48:03,125 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:48:03,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-27 21:48:03,125 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:48:03,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:48:03,126 INFO L82 PathProgramCache]: Analyzing trace with hash -1139697511, now seen corresponding path program 1 times [2020-08-27 21:48:03,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:48:03,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2134562186] [2020-08-27 21:48:03,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:48:03,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:03,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:48:03,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:03,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-27 21:48:03,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:03,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-08-27 21:48:03,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:03,236 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-27 21:48:03,236 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2134562186] [2020-08-27 21:48:03,236 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:48:03,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-27 21:48:03,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246525597] [2020-08-27 21:48:03,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-27 21:48:03,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:48:03,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-27 21:48:03,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-27 21:48:03,238 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 7 states. [2020-08-27 21:48:03,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:48:03,291 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2020-08-27 21:48:03,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-27 21:48:03,292 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-27 21:48:03,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:48:03,293 INFO L225 Difference]: With dead ends: 31 [2020-08-27 21:48:03,293 INFO L226 Difference]: Without dead ends: 27 [2020-08-27 21:48:03,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-08-27 21:48:03,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-27 21:48:03,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2020-08-27 21:48:03,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-27 21:48:03,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-27 21:48:03,300 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 24 [2020-08-27 21:48:03,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:48:03,300 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-27 21:48:03,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-27 21:48:03,301 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-27 21:48:03,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-27 21:48:03,302 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:48:03,302 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:48:03,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-27 21:48:03,303 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:48:03,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:48:03,303 INFO L82 PathProgramCache]: Analyzing trace with hash 99153721, now seen corresponding path program 1 times [2020-08-27 21:48:03,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:48:03,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [270797772] [2020-08-27 21:48:03,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:48:03,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:03,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:48:03,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:03,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-27 21:48:03,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:03,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-08-27 21:48:03,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:03,414 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-27 21:48:03,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [270797772] [2020-08-27 21:48:03,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:48:03,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-27 21:48:03,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667137113] [2020-08-27 21:48:03,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-27 21:48:03,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:48:03,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-27 21:48:03,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-27 21:48:03,417 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 8 states. [2020-08-27 21:48:03,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:48:03,495 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-27 21:48:03,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-27 21:48:03,496 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-27 21:48:03,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:48:03,497 INFO L225 Difference]: With dead ends: 34 [2020-08-27 21:48:03,498 INFO L226 Difference]: Without dead ends: 30 [2020-08-27 21:48:03,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-27 21:48:03,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-27 21:48:03,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-27 21:48:03,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-27 21:48:03,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2020-08-27 21:48:03,505 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 24 [2020-08-27 21:48:03,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:48:03,506 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2020-08-27 21:48:03,506 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-27 21:48:03,506 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2020-08-27 21:48:03,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-27 21:48:03,507 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:48:03,508 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:48:03,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-27 21:48:03,508 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:48:03,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:48:03,508 INFO L82 PathProgramCache]: Analyzing trace with hash 10057033, now seen corresponding path program 1 times [2020-08-27 21:48:03,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:48:03,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282240530] [2020-08-27 21:48:03,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:48:03,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:03,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:48:03,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:03,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-27 21:48:03,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:03,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-08-27 21:48:03,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:03,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-08-27 21:48:03,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:48:03,692 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-08-27 21:48:03,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [282240530] [2020-08-27 21:48:03,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:48:03,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-27 21:48:03,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729342327] [2020-08-27 21:48:03,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-27 21:48:03,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:48:03,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-27 21:48:03,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-27 21:48:03,699 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand 8 states. [2020-08-27 21:48:03,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:48:03,776 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2020-08-27 21:48:03,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-27 21:48:03,776 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2020-08-27 21:48:03,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:48:03,777 INFO L225 Difference]: With dead ends: 30 [2020-08-27 21:48:03,777 INFO L226 Difference]: Without dead ends: 0 [2020-08-27 21:48:03,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2020-08-27 21:48:03,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-27 21:48:03,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-27 21:48:03,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-27 21:48:03,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-27 21:48:03,781 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 32 [2020-08-27 21:48:03,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:48:03,781 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-27 21:48:03,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-27 21:48:03,782 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-27 21:48:03,782 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-27 21:48:03,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-27 21:48:03,786 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-27 21:48:03,894 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-27 21:48:03,894 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-27 21:48:03,894 INFO L268 CegarLoopResult]: For program point gcdFINAL(lines 15 26) no Hoare annotation was computed. [2020-08-27 21:48:03,895 INFO L268 CegarLoopResult]: For program point gcdEXIT(lines 15 26) no Hoare annotation was computed. [2020-08-27 21:48:03,895 INFO L264 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (= gcd_~y2 |gcd_#in~y2|) (<= (+ gcd_~y1 1) gcd_~y2) (= gcd_~y1 |gcd_#in~y1|) (<= 1 gcd_~y1)) [2020-08-27 21:48:03,895 INFO L268 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-08-27 21:48:03,895 INFO L271 CegarLoopResult]: At program point gcdENTRY(lines 15 26) the Hoare annotation is: true [2020-08-27 21:48:03,897 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (and (<= 1 gcd_~y2) (<= (+ gcd_~y2 1) gcd_~y1) (= gcd_~y2 |gcd_#in~y2|) (= gcd_~y1 |gcd_#in~y1|)) [2020-08-27 21:48:03,897 INFO L268 CegarLoopResult]: For program point L22(lines 22 24) no Hoare annotation was computed. [2020-08-27 21:48:03,897 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-08-27 21:48:03,897 INFO L268 CegarLoopResult]: For program point L19(lines 19 21) no Hoare annotation was computed. [2020-08-27 21:48:03,897 INFO L268 CegarLoopResult]: For program point L16(lines 16 18) no Hoare annotation was computed. [2020-08-27 21:48:03,898 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-27 21:48:03,898 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-27 21:48:03,898 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-27 21:48:03,898 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-27 21:48:03,898 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-08-27 21:48:03,899 INFO L268 CegarLoopResult]: For program point L30(lines 30 32) no Hoare annotation was computed. [2020-08-27 21:48:03,899 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 28 43) the Hoare annotation is: true [2020-08-27 21:48:03,899 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 28 43) no Hoare annotation was computed. [2020-08-27 21:48:03,899 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-08-27 21:48:03,899 INFO L268 CegarLoopResult]: For program point L38(lines 38 42) no Hoare annotation was computed. [2020-08-27 21:48:03,899 INFO L264 CegarLoopResult]: At program point L37(line 37) the Hoare annotation is: (and (<= 1 main_~n~0) (<= 1 main_~m~0)) [2020-08-27 21:48:03,900 INFO L268 CegarLoopResult]: For program point L38-1(lines 28 43) no Hoare annotation was computed. [2020-08-27 21:48:03,900 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-08-27 21:48:03,900 INFO L268 CegarLoopResult]: For program point L34(lines 34 36) no Hoare annotation was computed. [2020-08-27 21:48:03,910 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.08 09:48:03 BoogieIcfgContainer [2020-08-27 21:48:03,910 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-27 21:48:03,916 INFO L168 Benchmark]: Toolchain (without parser) took 3161.94 ms. Allocated memory was 148.4 MB in the beginning and 234.4 MB in the end (delta: 86.0 MB). Free memory was 104.1 MB in the beginning and 93.8 MB in the end (delta: 10.3 MB). Peak memory consumption was 96.3 MB. Max. memory is 7.1 GB. [2020-08-27 21:48:03,922 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 148.4 MB. Free memory was 122.9 MB in the beginning and 122.6 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-27 21:48:03,923 INFO L168 Benchmark]: CACSL2BoogieTranslator took 280.20 ms. Allocated memory is still 148.4 MB. Free memory was 103.9 MB in the beginning and 94.4 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-08-27 21:48:03,924 INFO L168 Benchmark]: Boogie Preprocessor took 126.47 ms. Allocated memory was 148.4 MB in the beginning and 205.0 MB in the end (delta: 56.6 MB). Free memory was 94.4 MB in the beginning and 183.1 MB in the end (delta: -88.7 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-08-27 21:48:03,924 INFO L168 Benchmark]: RCFGBuilder took 313.75 ms. Allocated memory is still 205.0 MB. Free memory was 183.1 MB in the beginning and 169.8 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. [2020-08-27 21:48:03,925 INFO L168 Benchmark]: TraceAbstraction took 2436.24 ms. Allocated memory was 205.0 MB in the beginning and 234.4 MB in the end (delta: 29.4 MB). Free memory was 169.1 MB in the beginning and 93.8 MB in the end (delta: 75.3 MB). Peak memory consumption was 104.7 MB. Max. memory is 7.1 GB. [2020-08-27 21:48:03,938 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 148.4 MB. Free memory was 122.9 MB in the beginning and 122.6 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 280.20 ms. Allocated memory is still 148.4 MB. Free memory was 103.9 MB in the beginning and 94.4 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 126.47 ms. Allocated memory was 148.4 MB in the beginning and 205.0 MB in the end (delta: 56.6 MB). Free memory was 94.4 MB in the beginning and 183.1 MB in the end (delta: -88.7 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 313.75 ms. Allocated memory is still 205.0 MB. Free memory was 183.1 MB in the beginning and 169.8 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2436.24 ms. Allocated memory was 205.0 MB in the beginning and 234.4 MB in the end (delta: 29.4 MB). Free memory was 169.1 MB in the beginning and 93.8 MB in the end (delta: 75.3 MB). Peak memory consumption was 104.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2.2s, OverallIterations: 7, TraceHistogramMax: 3, AutomataDifference: 0.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 138 SDtfs, 103 SDslu, 517 SDs, 0 SdLazy, 330 SolverSat, 21 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 115 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=30occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 14 PreInvPairs, 14 NumberOfFragments, 42 HoareAnnotationTreeSize, 14 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 8 FomulaSimplificationsInter, 10 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 157 NumberOfCodeBlocks, 157 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 150 ConstructedInterpolants, 0 QuantifiedInterpolants, 7192 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 7 PerfectInterpolantSequences, 34/34 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...