/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 true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_15x0-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:08:29,528 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:08:29,531 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:08:29,554 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:08:29,554 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:08:29,555 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:08:29,556 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:08:29,558 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:08:29,560 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:08:29,560 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:08:29,561 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:08:29,562 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:08:29,563 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:08:29,563 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:08:29,567 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:08:29,568 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:08:29,569 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:08:29,570 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:08:29,572 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:08:29,573 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:08:29,575 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:08:29,576 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:08:29,577 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:08:29,577 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:08:29,580 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 18:08:29,580 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 18:08:29,580 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 18:08:29,581 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 18:08:29,582 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 18:08:29,582 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 18:08:29,587 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:08:29,588 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:08:29,589 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:08:29,590 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 [2020-08-21 18:08:29,611 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:08:29,612 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:08:29,613 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:08:29,613 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:08:29,613 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:08:29,613 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:08:29,614 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:08:29,614 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:08:29,614 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:08:29,614 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:08:29,614 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:08:29,615 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:08:29,615 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:08:29,615 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:08:29,615 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:08:29,615 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:08:29,615 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:08:29,616 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:08:29,616 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:08:29,616 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:08:29,616 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:08:29,616 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:08:29,617 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:08:29,617 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:08:29,617 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:08:29,617 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:08:29,617 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:08:29,618 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:08:29,618 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:08:29,618 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 -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; [2020-08-21 18:08:29,927 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:08:29,940 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:08:29,946 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:08:29,947 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:08:29,948 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:08:29,949 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_15x0-2.c [2020-08-21 18:08:30,008 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf76b1aa6/10a2c3031aca4e8bb07ec682fc16b324/FLAG1c86e5a7b [2020-08-21 18:08:30,440 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:08:30,441 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/sum_15x0-2.c [2020-08-21 18:08:30,447 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf76b1aa6/10a2c3031aca4e8bb07ec682fc16b324/FLAG1c86e5a7b [2020-08-21 18:08:30,469 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf76b1aa6/10a2c3031aca4e8bb07ec682fc16b324 [2020-08-21 18:08:30,480 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:08:30,482 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:08:30,487 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:08:30,487 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:08:30,491 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:08:30,492 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:08:30" (1/1) ... [2020-08-21 18:08:30,496 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42e65116 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:30, skipping insertion in model container [2020-08-21 18:08:30,496 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:08:30" (1/1) ... [2020-08-21 18:08:30,505 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:08:30,528 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:08:30,736 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:08:30,740 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:08:30,756 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:08:30,771 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:08:30,771 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:30 WrapperNode [2020-08-21 18:08:30,772 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:08:30,772 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:08:30,772 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:08:30,773 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:08:30,786 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:30" (1/1) ... [2020-08-21 18:08:30,787 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:30" (1/1) ... [2020-08-21 18:08:30,792 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:30" (1/1) ... [2020-08-21 18:08:30,792 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:30" (1/1) ... [2020-08-21 18:08:30,796 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:30" (1/1) ... [2020-08-21 18:08:30,798 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:30" (1/1) ... [2020-08-21 18:08:30,799 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:30" (1/1) ... [2020-08-21 18:08:30,800 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:08:30,801 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:08:30,801 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:08:30,801 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:08:30,802 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:30" (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 [2020-08-21 18:08:30,945 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:08:30,945 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:08:30,945 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-08-21 18:08:30,945 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:08:30,946 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:08:30,946 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-08-21 18:08:30,946 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:08:30,946 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:08:30,946 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:08:31,124 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:08:31,125 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 18:08:31,129 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:08:31 BoogieIcfgContainer [2020-08-21 18:08:31,129 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:08:31,131 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:08:31,131 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:08:31,134 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:08:31,135 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:08:30" (1/3) ... [2020-08-21 18:08:31,136 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56cffb69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:08:31, skipping insertion in model container [2020-08-21 18:08:31,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:30" (2/3) ... [2020-08-21 18:08:31,136 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56cffb69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:08:31, skipping insertion in model container [2020-08-21 18:08:31,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:08:31" (3/3) ... [2020-08-21 18:08:31,138 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_15x0-2.c [2020-08-21 18:08:31,149 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:08:31,156 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:08:31,172 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:08:31,199 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:08:31,199 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:08:31,199 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:08:31,200 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:08:31,200 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:08:31,200 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:08:31,200 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:08:31,201 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:08:31,226 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-21 18:08:31,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 18:08:31,235 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:31,236 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:31,236 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:31,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:31,255 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-08-21 18:08:31,281 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:31,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250425279] [2020-08-21 18:08:31,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:31,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:31,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:31,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:31,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:31,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:31,567 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:08:31,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250425279] [2020-08-21 18:08:31,569 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:08:31,569 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 18:08:31,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942279284] [2020-08-21 18:08:31,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:08:31,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:31,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:08:31,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:08:31,588 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-21 18:08:31,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:31,678 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-21 18:08:31,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:08:31,680 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 18:08:31,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:31,691 INFO L225 Difference]: With dead ends: 30 [2020-08-21 18:08:31,691 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 18:08:31,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:08:31,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 18:08:31,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 18:08:31,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 18:08:31,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-21 18:08:31,737 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-21 18:08:31,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:31,737 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-21 18:08:31,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:08:31,738 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-21 18:08:31,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 18:08:31,740 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:31,740 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:31,741 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:08:31,741 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:31,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:31,741 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-08-21 18:08:31,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:31,742 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1518192872] [2020-08-21 18:08:31,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:31,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:31,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:31,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:31,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:31,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:31,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:31,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:31,861 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 18:08:31,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1518192872] [2020-08-21 18:08:31,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:31,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 18:08:31,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204580349] [2020-08-21 18:08:31,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 18:08:31,865 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:31,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 18:08:31,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:08:31,866 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2020-08-21 18:08:31,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:31,924 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-21 18:08:31,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 18:08:31,925 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-21 18:08:31,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:31,926 INFO L225 Difference]: With dead ends: 25 [2020-08-21 18:08:31,926 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 18:08:31,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:08:31,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 18:08:31,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 18:08:31,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 18:08:31,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 18:08:31,935 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-21 18:08:31,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:31,935 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 18:08:31,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 18:08:31,936 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 18:08:31,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 18:08:31,937 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:31,937 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:31,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:08:31,938 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:31,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:31,938 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-08-21 18:08:31,939 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:31,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [228177973] [2020-08-21 18:08:31,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:31,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:31,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:31,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:31,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:32,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:32,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:32,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,096 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-21 18:08:32,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [228177973] [2020-08-21 18:08:32,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:32,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 18:08:32,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674833868] [2020-08-21 18:08:32,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 18:08:32,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:32,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 18:08:32,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:08:32,099 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2020-08-21 18:08:32,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:32,161 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-21 18:08:32,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 18:08:32,162 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-08-21 18:08:32,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:32,163 INFO L225 Difference]: With dead ends: 28 [2020-08-21 18:08:32,163 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 18:08:32,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:08:32,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 18:08:32,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 18:08:32,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 18:08:32,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-21 18:08:32,171 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-21 18:08:32,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:32,172 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-21 18:08:32,172 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 18:08:32,172 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-21 18:08:32,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 18:08:32,174 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:32,174 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:32,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:08:32,174 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:32,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:32,175 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2020-08-21 18:08:32,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:32,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [851094052] [2020-08-21 18:08:32,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:32,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:32,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:32,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:32,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:32,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:32,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,367 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-08-21 18:08:32,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [851094052] [2020-08-21 18:08:32,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:32,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 18:08:32,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016993974] [2020-08-21 18:08:32,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 18:08:32,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:32,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 18:08:32,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:08:32,370 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2020-08-21 18:08:32,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:32,465 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-08-21 18:08:32,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 18:08:32,465 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-08-21 18:08:32,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:32,467 INFO L225 Difference]: With dead ends: 31 [2020-08-21 18:08:32,467 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 18:08:32,468 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:08:32,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 18:08:32,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 18:08:32,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 18:08:32,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 18:08:32,475 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-08-21 18:08:32,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:32,475 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 18:08:32,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 18:08:32,476 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 18:08:32,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 18:08:32,477 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:32,477 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:32,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:08:32,478 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:32,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:32,478 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2020-08-21 18:08:32,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:32,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [519809990] [2020-08-21 18:08:32,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:32,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:32,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:32,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:32,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:32,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:32,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:32,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,678 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-08-21 18:08:32,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [519809990] [2020-08-21 18:08:32,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:32,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 18:08:32,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036202995] [2020-08-21 18:08:32,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 18:08:32,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:32,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 18:08:32,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:08:32,681 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2020-08-21 18:08:32,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:32,778 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-08-21 18:08:32,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 18:08:32,779 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2020-08-21 18:08:32,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:32,780 INFO L225 Difference]: With dead ends: 34 [2020-08-21 18:08:32,781 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 18:08:32,781 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:08:32,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 18:08:32,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 18:08:32,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 18:08:32,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-21 18:08:32,788 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-08-21 18:08:32,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:32,789 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-21 18:08:32,789 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 18:08:32,789 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-21 18:08:32,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 18:08:32,791 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:32,791 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:32,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 18:08:32,792 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:32,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:32,792 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2020-08-21 18:08:32,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:32,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [804034045] [2020-08-21 18:08:32,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:32,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:32,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:32,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:32,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:32,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:32,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:32,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:32,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:32,988 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-08-21 18:08:32,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [804034045] [2020-08-21 18:08:32,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:32,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 18:08:32,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702269999] [2020-08-21 18:08:32,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 18:08:32,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:32,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 18:08:32,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:08:32,991 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2020-08-21 18:08:33,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:33,103 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-08-21 18:08:33,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 18:08:33,104 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2020-08-21 18:08:33,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:33,105 INFO L225 Difference]: With dead ends: 37 [2020-08-21 18:08:33,106 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 18:08:33,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:08:33,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 18:08:33,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 18:08:33,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 18:08:33,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 18:08:33,113 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-08-21 18:08:33,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:33,113 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 18:08:33,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 18:08:33,114 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 18:08:33,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 18:08:33,115 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:33,116 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:33,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 18:08:33,116 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:33,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:33,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2020-08-21 18:08:33,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:33,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1138361797] [2020-08-21 18:08:33,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:33,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:33,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:33,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,355 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-08-21 18:08:33,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1138361797] [2020-08-21 18:08:33,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:33,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 18:08:33,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234285731] [2020-08-21 18:08:33,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 18:08:33,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:33,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 18:08:33,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:08:33,359 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 18:08:33,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:33,464 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-08-21 18:08:33,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 18:08:33,465 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-08-21 18:08:33,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:33,466 INFO L225 Difference]: With dead ends: 40 [2020-08-21 18:08:33,467 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 18:08:33,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=110, Invalid=196, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:08:33,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 18:08:33,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 18:08:33,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 18:08:33,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-08-21 18:08:33,474 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-08-21 18:08:33,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:33,474 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-08-21 18:08:33,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 18:08:33,475 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-08-21 18:08:33,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 18:08:33,476 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:33,476 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:33,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 18:08:33,476 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:33,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:33,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2020-08-21 18:08:33,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:33,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911453051] [2020-08-21 18:08:33,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:33,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:33,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:33,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,719 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-08-21 18:08:33,720 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911453051] [2020-08-21 18:08:33,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:33,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 18:08:33,721 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326184417] [2020-08-21 18:08:33,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 18:08:33,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:33,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 18:08:33,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:08:33,722 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2020-08-21 18:08:33,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:33,841 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-08-21 18:08:33,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 18:08:33,842 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2020-08-21 18:08:33,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:33,843 INFO L225 Difference]: With dead ends: 43 [2020-08-21 18:08:33,843 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 18:08:33,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=137, Invalid=243, Unknown=0, NotChecked=0, Total=380 [2020-08-21 18:08:33,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 18:08:33,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 18:08:33,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 18:08:33,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 18:08:33,851 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-08-21 18:08:33,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:33,852 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 18:08:33,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 18:08:33,852 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 18:08:33,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-21 18:08:33,853 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:33,853 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:33,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 18:08:33,854 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:33,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:33,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2020-08-21 18:08:33,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:33,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698528735] [2020-08-21 18:08:33,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:33,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:33,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:33,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:33,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:33,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,143 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-08-21 18:08:34,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698528735] [2020-08-21 18:08:34,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:34,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 18:08:34,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191333050] [2020-08-21 18:08:34,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 18:08:34,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:34,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 18:08:34,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:08:34,146 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2020-08-21 18:08:34,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:34,274 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-08-21 18:08:34,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 18:08:34,275 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2020-08-21 18:08:34,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:34,277 INFO L225 Difference]: With dead ends: 46 [2020-08-21 18:08:34,277 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 18:08:34,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2020-08-21 18:08:34,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 18:08:34,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 18:08:34,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 18:08:34,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-08-21 18:08:34,284 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-08-21 18:08:34,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:34,285 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-08-21 18:08:34,285 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 18:08:34,285 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-08-21 18:08:34,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-21 18:08:34,286 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:34,286 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:34,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 18:08:34,287 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:34,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:34,287 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2020-08-21 18:08:34,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:34,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410443090] [2020-08-21 18:08:34,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:34,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:34,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:34,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,603 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-08-21 18:08:34,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410443090] [2020-08-21 18:08:34,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:34,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 18:08:34,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429748059] [2020-08-21 18:08:34,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 18:08:34,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:34,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 18:08:34,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:08:34,608 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2020-08-21 18:08:34,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:34,770 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-21 18:08:34,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 18:08:34,770 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2020-08-21 18:08:34,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:34,772 INFO L225 Difference]: With dead ends: 49 [2020-08-21 18:08:34,772 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 18:08:34,773 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2020-08-21 18:08:34,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 18:08:34,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 18:08:34,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 18:08:34,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-21 18:08:34,779 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-08-21 18:08:34,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:34,780 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-21 18:08:34,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 18:08:34,780 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-21 18:08:34,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-21 18:08:34,781 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:34,781 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:34,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 18:08:34,782 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:34,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:34,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2020-08-21 18:08:34,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:34,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [946314487] [2020-08-21 18:08:34,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:34,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:34,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:34,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:34,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:34,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,153 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-08-21 18:08:35,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [946314487] [2020-08-21 18:08:35,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:35,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 18:08:35,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503865359] [2020-08-21 18:08:35,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 18:08:35,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:35,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 18:08:35,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210 [2020-08-21 18:08:35,157 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2020-08-21 18:08:35,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:35,349 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-08-21 18:08:35,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 18:08:35,349 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2020-08-21 18:08:35,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:35,350 INFO L225 Difference]: With dead ends: 52 [2020-08-21 18:08:35,351 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 18:08:35,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=236, Invalid=414, Unknown=0, NotChecked=0, Total=650 [2020-08-21 18:08:35,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 18:08:35,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 18:08:35,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 18:08:35,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-08-21 18:08:35,368 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-08-21 18:08:35,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:35,368 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-08-21 18:08:35,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 18:08:35,371 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-08-21 18:08:35,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-21 18:08:35,372 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:35,372 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:35,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 18:08:35,372 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:35,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:35,373 INFO L82 PathProgramCache]: Analyzing trace with hash -2010530748, now seen corresponding path program 11 times [2020-08-21 18:08:35,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:35,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1555057776] [2020-08-21 18:08:35,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:35,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:35,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:35,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:35,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:35,804 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-08-21 18:08:35,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1555057776] [2020-08-21 18:08:35,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:35,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 18:08:35,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215044396] [2020-08-21 18:08:35,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 18:08:35,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:35,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 18:08:35,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:08:35,806 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2020-08-21 18:08:36,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:36,008 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-08-21 18:08:36,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 18:08:36,008 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2020-08-21 18:08:36,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:36,009 INFO L225 Difference]: With dead ends: 55 [2020-08-21 18:08:36,009 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 18:08:36,011 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=275, Invalid=481, Unknown=0, NotChecked=0, Total=756 [2020-08-21 18:08:36,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 18:08:36,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 18:08:36,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 18:08:36,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-21 18:08:36,017 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2020-08-21 18:08:36,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:36,017 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-21 18:08:36,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 18:08:36,018 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-21 18:08:36,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-21 18:08:36,019 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:36,019 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:36,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 18:08:36,019 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:36,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:36,020 INFO L82 PathProgramCache]: Analyzing trace with hash -986521316, now seen corresponding path program 12 times [2020-08-21 18:08:36,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:36,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [826033733] [2020-08-21 18:08:36,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:36,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:36,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:36,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,490 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-08-21 18:08:36,491 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [826033733] [2020-08-21 18:08:36,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:36,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 18:08:36,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528989479] [2020-08-21 18:08:36,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 18:08:36,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:36,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 18:08:36,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=163, Unknown=0, NotChecked=0, Total=272 [2020-08-21 18:08:36,494 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2020-08-21 18:08:36,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:36,718 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2020-08-21 18:08:36,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 18:08:36,719 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2020-08-21 18:08:36,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:36,720 INFO L225 Difference]: With dead ends: 58 [2020-08-21 18:08:36,720 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 18:08:36,723 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=317, Invalid=553, Unknown=0, NotChecked=0, Total=870 [2020-08-21 18:08:36,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 18:08:36,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 18:08:36,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 18:08:36,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-08-21 18:08:36,735 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2020-08-21 18:08:36,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:36,736 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-08-21 18:08:36,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 18:08:36,737 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-08-21 18:08:36,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-21 18:08:36,738 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:36,739 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:36,739 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 18:08:36,739 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:36,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:36,740 INFO L82 PathProgramCache]: Analyzing trace with hash 1073897604, now seen corresponding path program 13 times [2020-08-21 18:08:36,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:36,742 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [773290366] [2020-08-21 18:08:36,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:36,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:36,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:36,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:36,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:36,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,393 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-08-21 18:08:37,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [773290366] [2020-08-21 18:08:37,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:37,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 18:08:37,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31704907] [2020-08-21 18:08:37,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 18:08:37,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:37,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 18:08:37,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:08:37,396 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2020-08-21 18:08:37,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:37,631 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-08-21 18:08:37,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 18:08:37,631 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2020-08-21 18:08:37,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:37,633 INFO L225 Difference]: With dead ends: 61 [2020-08-21 18:08:37,633 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 18:08:37,634 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=362, Invalid=630, Unknown=0, NotChecked=0, Total=992 [2020-08-21 18:08:37,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 18:08:37,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 18:08:37,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 18:08:37,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-21 18:08:37,644 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2020-08-21 18:08:37,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:37,648 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-21 18:08:37,649 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 18:08:37,649 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-21 18:08:37,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-08-21 18:08:37,650 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:37,650 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:37,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 18:08:37,650 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:37,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:37,652 INFO L82 PathProgramCache]: Analyzing trace with hash -1572648100, now seen corresponding path program 14 times [2020-08-21 18:08:37,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:37,652 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [457889121] [2020-08-21 18:08:37,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:37,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:37,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:37,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:37,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:37,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:38,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:38,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:38,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:38,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:38,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:38,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:38,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:38,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:38,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:38,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:38,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:38,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:38,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:38,286 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-08-21 18:08:38,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [457889121] [2020-08-21 18:08:38,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:38,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 18:08:38,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132263808] [2020-08-21 18:08:38,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 18:08:38,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:38,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 18:08:38,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=202, Unknown=0, NotChecked=0, Total=342 [2020-08-21 18:08:38,289 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2020-08-21 18:08:38,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:38,513 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-08-21 18:08:38,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 18:08:38,513 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2020-08-21 18:08:38,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:38,514 INFO L225 Difference]: With dead ends: 64 [2020-08-21 18:08:38,514 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 18:08:38,516 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=410, Invalid=712, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 18:08:38,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 18:08:38,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-08-21 18:08:38,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-21 18:08:38,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-08-21 18:08:38,521 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2020-08-21 18:08:38,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:38,522 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-08-21 18:08:38,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 18:08:38,522 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-08-21 18:08:38,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-08-21 18:08:38,523 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:38,523 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:38,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 18:08:38,524 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:38,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:38,524 INFO L82 PathProgramCache]: Analyzing trace with hash 1584030916, now seen corresponding path program 15 times [2020-08-21 18:08:38,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:38,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [986591671] [2020-08-21 18:08:38,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:38,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 18:08:38,552 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 18:08:38,552 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 18:08:38,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 18:08:38,583 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 06:08:38 BoogieIcfgContainer [2020-08-21 18:08:38,583 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 18:08:38,586 INFO L168 Benchmark]: Toolchain (without parser) took 8103.65 ms. Allocated memory was 139.5 MB in the beginning and 328.2 MB in the end (delta: 188.7 MB). Free memory was 101.4 MB in the beginning and 224.9 MB in the end (delta: -123.6 MB). Peak memory consumption was 65.2 MB. Max. memory is 7.1 GB. [2020-08-21 18:08:38,587 INFO L168 Benchmark]: CDTParser took 4.34 ms. Allocated memory is still 139.5 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 18:08:38,588 INFO L168 Benchmark]: CACSL2BoogieTranslator took 285.22 ms. Allocated memory is still 139.5 MB. Free memory was 101.1 MB in the beginning and 91.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-21 18:08:38,589 INFO L168 Benchmark]: Boogie Preprocessor took 28.03 ms. Allocated memory is still 139.5 MB. Free memory was 91.8 MB in the beginning and 90.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-08-21 18:08:38,589 INFO L168 Benchmark]: RCFGBuilder took 328.55 ms. Allocated memory was 139.5 MB in the beginning and 204.5 MB in the end (delta: 65.0 MB). Free memory was 90.4 MB in the beginning and 172.3 MB in the end (delta: -81.8 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-08-21 18:08:38,590 INFO L168 Benchmark]: TraceAbstraction took 7452.62 ms. Allocated memory was 204.5 MB in the beginning and 328.2 MB in the end (delta: 123.7 MB). Free memory was 171.6 MB in the beginning and 224.9 MB in the end (delta: -53.3 MB). Peak memory consumption was 70.4 MB. Max. memory is 7.1 GB. [2020-08-21 18:08:38,593 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 4.34 ms. Allocated memory is still 139.5 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 285.22 ms. Allocated memory is still 139.5 MB. Free memory was 101.1 MB in the beginning and 91.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 28.03 ms. Allocated memory is still 139.5 MB. Free memory was 91.8 MB in the beginning and 90.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 328.55 ms. Allocated memory was 139.5 MB in the beginning and 204.5 MB in the end (delta: 65.0 MB). Free memory was 90.4 MB in the beginning and 172.3 MB in the end (delta: -81.8 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7452.62 ms. Allocated memory was 204.5 MB in the beginning and 328.2 MB in the end (delta: 123.7 MB). Free memory was 171.6 MB in the beginning and 224.9 MB in the end (delta: -53.3 MB). Peak memory consumption was 70.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 15; [L13] int b = 0; [L14] CALL, EXPR sum(a, b) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND TRUE n <= 0 [L5] return m + n; [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) [L14] int result = sum(a, b); [L15] COND TRUE result == a + b [L16] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 7.3s, OverallIterations: 16, TraceHistogramMax: 16, AutomataDifference: 2.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 183 SDtfs, 318 SDslu, 711 SDs, 0 SdLazy, 522 SolverSat, 33 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 555 GetRequests, 285 SyntacticMatches, 0 SemanticMatches, 270 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1015 ImplicationChecksByTransitivity, 2.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 15 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 4.3s InterpolantComputationTime, 928 NumberOfCodeBlocks, 928 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 810 ConstructedInterpolants, 0 QuantifiedInterpolants, 133800 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 15 InterpolantComputations, 1 PerfectInterpolantSequences, 1575/3150 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 incorrect! Received shutdown request...