/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=DEEPEST --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_10x0-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 20:33:35,021 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 20:33:35,049 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 20:33:35,050 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 20:33:35,052 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 20:33:35,054 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 20:33:35,056 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 20:33:35,057 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 20:33:35,058 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 20:33:35,059 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 20:33:35,059 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 20:33:35,060 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 20:33:35,061 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 20:33:35,063 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 20:33:35,063 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 20:33:35,064 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 20:33:35,066 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 20:33:35,069 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 20:33:35,070 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 20:33:35,072 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 20:33:35,073 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 20:33:35,074 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 20:33:35,076 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 20:33:35,089 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 20:33:35,090 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 20:33:35,090 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 20:33:35,092 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 20:33:35,137 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 20:33:35,138 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 20:33:35,139 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 20:33:35,140 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 20:33:35,140 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 20:33:35,140 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 20:33:35,140 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 20:33:35,141 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 20:33:35,141 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 20:33:35,141 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 20:33:35,142 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 20:33:35,142 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 20:33:35,142 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 20:33:35,143 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 20:33:35,143 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 20:33:35,143 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 20:33:35,144 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 20:33:35,144 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 20:33:35,144 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 20:33:35,144 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 20:33:35,144 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 20:33:35,144 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:33:35,145 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 20:33:35,145 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 20:33:35,145 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 20:33:35,145 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 20:33:35,145 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 20:33:35,146 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 20:33:35,146 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 20:33:35,146 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=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; [2020-08-21 20:33:35,482 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 20:33:35,495 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 20:33:35,498 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 20:33:35,500 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 20:33:35,500 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 20:33:35,501 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_10x0-2.c [2020-08-21 20:33:35,568 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8f82f0694/43b24c39f7594c7280f1e76da3a77aa9/FLAG498d66e66 [2020-08-21 20:33:35,970 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 20:33:35,971 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/sum_10x0-2.c [2020-08-21 20:33:35,977 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8f82f0694/43b24c39f7594c7280f1e76da3a77aa9/FLAG498d66e66 [2020-08-21 20:33:36,350 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8f82f0694/43b24c39f7594c7280f1e76da3a77aa9 [2020-08-21 20:33:36,359 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 20:33:36,360 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 20:33:36,363 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 20:33:36,363 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 20:33:36,367 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 20:33:36,368 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:33:36" (1/1) ... [2020-08-21 20:33:36,371 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d98017f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:36, skipping insertion in model container [2020-08-21 20:33:36,372 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:33:36" (1/1) ... [2020-08-21 20:33:36,381 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 20:33:36,397 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 20:33:36,566 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:33:36,571 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 20:33:36,588 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:33:36,604 INFO L208 MainTranslator]: Completed translation [2020-08-21 20:33:36,604 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:36 WrapperNode [2020-08-21 20:33:36,605 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 20:33:36,605 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 20:33:36,606 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 20:33:36,606 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 20:33:36,620 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:36" (1/1) ... [2020-08-21 20:33:36,621 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:36" (1/1) ... [2020-08-21 20:33:36,625 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:36" (1/1) ... [2020-08-21 20:33:36,626 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:36" (1/1) ... [2020-08-21 20:33:36,629 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:36" (1/1) ... [2020-08-21 20:33:36,631 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:36" (1/1) ... [2020-08-21 20:33:36,632 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:36" (1/1) ... [2020-08-21 20:33:36,634 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 20:33:36,635 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 20:33:36,635 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 20:33:36,635 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 20:33:36,636 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:36" (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 20:33:36,788 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 20:33:36,788 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 20:33:36,788 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-08-21 20:33:36,788 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 20:33:36,789 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 20:33:36,789 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-08-21 20:33:36,789 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 20:33:36,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 20:33:36,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 20:33:36,964 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 20:33:36,965 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 20:33:36,968 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:33:36 BoogieIcfgContainer [2020-08-21 20:33:36,968 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 20:33:36,970 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 20:33:36,970 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 20:33:36,973 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 20:33:36,974 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 08:33:36" (1/3) ... [2020-08-21 20:33:36,975 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f72dd24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:33:36, skipping insertion in model container [2020-08-21 20:33:36,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:36" (2/3) ... [2020-08-21 20:33:36,975 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f72dd24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:33:36, skipping insertion in model container [2020-08-21 20:33:36,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:33:36" (3/3) ... [2020-08-21 20:33:36,977 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_10x0-2.c [2020-08-21 20:33:36,985 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 20:33:36,993 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 20:33:37,007 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 20:33:37,032 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 20:33:37,032 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 20:33:37,032 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 20:33:37,033 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 20:33:37,033 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 20:33:37,033 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 20:33:37,033 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 20:33:37,033 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 20:33:37,050 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-21 20:33:37,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 20:33:37,055 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:37,056 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:37,057 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:37,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:37,063 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-08-21 20:33:37,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:37,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [532060294] [2020-08-21 20:33:37,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:37,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:37,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:37,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:37,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:37,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:37,332 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 20:33:37,333 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [532060294] [2020-08-21 20:33:37,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:33:37,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 20:33:37,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373976158] [2020-08-21 20:33:37,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:33:37,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:37,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:33:37,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:33:37,364 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-21 20:33:37,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:37,467 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-21 20:33:37,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 20:33:37,469 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 20:33:37,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:37,481 INFO L225 Difference]: With dead ends: 30 [2020-08-21 20:33:37,481 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 20:33:37,485 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 20:33:37,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 20:33:37,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 20:33:37,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 20:33:37,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-21 20:33:37,541 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-21 20:33:37,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:37,541 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-21 20:33:37,542 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:33:37,542 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-21 20:33:37,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 20:33:37,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:37,544 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 20:33:37,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 20:33:37,545 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:37,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:37,545 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-08-21 20:33:37,546 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:37,546 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1693347791] [2020-08-21 20:33:37,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:37,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:37,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:37,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:37,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:37,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:37,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:37,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:37,682 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 20:33:37,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1693347791] [2020-08-21 20:33:37,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:37,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 20:33:37,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429181706] [2020-08-21 20:33:37,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 20:33:37,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:37,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 20:33:37,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:33:37,687 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2020-08-21 20:33:37,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:37,754 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-21 20:33:37,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:33:37,754 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-21 20:33:37,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:37,756 INFO L225 Difference]: With dead ends: 25 [2020-08-21 20:33:37,756 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 20:33:37,758 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 20:33:37,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 20:33:37,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 20:33:37,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 20:33:37,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 20:33:37,765 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-21 20:33:37,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:37,766 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 20:33:37,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 20:33:37,766 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 20:33:37,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 20:33:37,767 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:37,768 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 20:33:37,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 20:33:37,768 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:37,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:37,769 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-08-21 20:33:37,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:37,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [953555582] [2020-08-21 20:33:37,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:37,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:37,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:37,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:37,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:37,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:37,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:37,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:37,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:37,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:37,962 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 20:33:37,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [953555582] [2020-08-21 20:33:37,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:37,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 20:33:37,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888589112] [2020-08-21 20:33:37,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 20:33:37,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:37,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 20:33:37,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:33:37,965 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2020-08-21 20:33:38,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:38,039 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-21 20:33:38,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 20:33:38,040 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-08-21 20:33:38,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:38,042 INFO L225 Difference]: With dead ends: 28 [2020-08-21 20:33:38,042 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 20:33:38,043 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 20:33:38,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 20:33:38,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 20:33:38,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 20:33:38,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-21 20:33:38,055 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-21 20:33:38,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:38,055 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-21 20:33:38,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 20:33:38,056 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-21 20:33:38,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 20:33:38,058 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:38,058 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 20:33:38,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 20:33:38,060 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:38,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:38,060 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2020-08-21 20:33:38,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:38,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [503308189] [2020-08-21 20:33:38,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:38,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:38,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:38,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:38,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:38,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:38,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,278 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 20:33:38,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [503308189] [2020-08-21 20:33:38,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:38,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 20:33:38,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313971526] [2020-08-21 20:33:38,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:33:38,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:38,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:33:38,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:33:38,284 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2020-08-21 20:33:38,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:38,369 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-08-21 20:33:38,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 20:33:38,370 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-08-21 20:33:38,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:38,371 INFO L225 Difference]: With dead ends: 31 [2020-08-21 20:33:38,371 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 20:33:38,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:33:38,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 20:33:38,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 20:33:38,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 20:33:38,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 20:33:38,380 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-08-21 20:33:38,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:38,380 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 20:33:38,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:33:38,381 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 20:33:38,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 20:33:38,382 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:38,382 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 20:33:38,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 20:33:38,383 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:38,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:38,383 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2020-08-21 20:33:38,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:38,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [907559971] [2020-08-21 20:33:38,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:38,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:38,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:38,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:38,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:38,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:38,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:38,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,551 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 20:33:38,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [907559971] [2020-08-21 20:33:38,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:38,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:33:38,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430783905] [2020-08-21 20:33:38,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:33:38,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:38,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:33:38,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:33:38,554 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2020-08-21 20:33:38,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:38,643 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-08-21 20:33:38,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:33:38,644 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2020-08-21 20:33:38,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:38,645 INFO L225 Difference]: With dead ends: 34 [2020-08-21 20:33:38,645 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 20:33:38,646 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:33:38,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 20:33:38,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 20:33:38,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 20:33:38,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-21 20:33:38,653 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-08-21 20:33:38,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:38,654 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-21 20:33:38,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:33:38,654 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-21 20:33:38,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 20:33:38,656 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:38,656 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 20:33:38,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 20:33:38,656 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:38,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:38,657 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2020-08-21 20:33:38,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:38,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785188693] [2020-08-21 20:33:38,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:38,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:38,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:38,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,722 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:38,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:38,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:38,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:38,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:38,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,837 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 20:33:38,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785188693] [2020-08-21 20:33:38,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:38,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 20:33:38,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495302879] [2020-08-21 20:33:38,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:33:38,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:38,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:33:38,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:33:38,840 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2020-08-21 20:33:38,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:38,937 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-08-21 20:33:38,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:33:38,937 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2020-08-21 20:33:38,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:38,939 INFO L225 Difference]: With dead ends: 37 [2020-08-21 20:33:38,939 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 20:33:38,940 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 20:33:38,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 20:33:38,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 20:33:38,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 20:33:38,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 20:33:38,948 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-08-21 20:33:38,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:38,949 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 20:33:38,949 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:33:38,949 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 20:33:38,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 20:33:38,951 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:38,951 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 20:33:38,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 20:33:38,952 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:38,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:38,952 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2020-08-21 20:33:38,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:38,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1221685565] [2020-08-21 20:33:38,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:38,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:38,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:38,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:38,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,179 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 20:33:39,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1221685565] [2020-08-21 20:33:39,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:39,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 20:33:39,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308585460] [2020-08-21 20:33:39,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 20:33:39,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:39,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 20:33:39,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:33:39,181 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 20:33:39,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:39,286 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-08-21 20:33:39,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 20:33:39,286 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-08-21 20:33:39,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:39,288 INFO L225 Difference]: With dead ends: 40 [2020-08-21 20:33:39,288 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 20:33:39,289 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 20:33:39,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 20:33:39,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 20:33:39,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 20:33:39,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-08-21 20:33:39,296 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-08-21 20:33:39,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:39,296 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-08-21 20:33:39,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 20:33:39,296 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-08-21 20:33:39,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 20:33:39,297 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:39,298 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 20:33:39,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 20:33:39,298 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:39,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:39,299 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2020-08-21 20:33:39,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:39,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1033147038] [2020-08-21 20:33:39,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:39,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:39,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:39,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,536 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 20:33:39,537 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1033147038] [2020-08-21 20:33:39,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:39,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 20:33:39,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609964369] [2020-08-21 20:33:39,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 20:33:39,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:39,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 20:33:39,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:33:39,539 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2020-08-21 20:33:39,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:39,656 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-08-21 20:33:39,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 20:33:39,656 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2020-08-21 20:33:39,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:39,658 INFO L225 Difference]: With dead ends: 43 [2020-08-21 20:33:39,658 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 20:33:39,659 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 20:33:39,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 20:33:39,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 20:33:39,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 20:33:39,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 20:33:39,665 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-08-21 20:33:39,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:39,666 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 20:33:39,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 20:33:39,666 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 20:33:39,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-21 20:33:39,667 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:39,668 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 20:33:39,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 20:33:39,668 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:39,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:39,669 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2020-08-21 20:33:39,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:39,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [754488346] [2020-08-21 20:33:39,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:39,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:39,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:39,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,966 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 20:33:39,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [754488346] [2020-08-21 20:33:39,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:39,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 20:33:39,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902489709] [2020-08-21 20:33:39,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 20:33:39,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:39,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 20:33:39,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:33:39,969 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2020-08-21 20:33:40,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:40,113 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-08-21 20:33:40,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 20:33:40,114 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2020-08-21 20:33:40,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:40,115 INFO L225 Difference]: With dead ends: 46 [2020-08-21 20:33:40,115 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 20:33:40,117 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:33:40,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 20:33:40,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 20:33:40,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 20:33:40,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-08-21 20:33:40,124 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-08-21 20:33:40,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:40,124 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-08-21 20:33:40,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 20:33:40,124 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-08-21 20:33:40,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-21 20:33:40,126 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:40,126 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 20:33:40,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 20:33:40,126 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:40,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:40,127 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2020-08-21 20:33:40,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:40,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2081094445] [2020-08-21 20:33:40,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:40,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:40,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:40,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,528 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 20:33:40,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2081094445] [2020-08-21 20:33:40,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:40,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 20:33:40,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615894459] [2020-08-21 20:33:40,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 20:33:40,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:40,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 20:33:40,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:33:40,532 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2020-08-21 20:33:40,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:40,674 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-21 20:33:40,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 20:33:40,675 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2020-08-21 20:33:40,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:40,676 INFO L225 Difference]: With dead ends: 49 [2020-08-21 20:33:40,676 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 20:33:40,677 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 20:33:40,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 20:33:40,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 20:33:40,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 20:33:40,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-21 20:33:40,683 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-08-21 20:33:40,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:40,684 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-21 20:33:40,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 20:33:40,684 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-21 20:33:40,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-21 20:33:40,686 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:40,686 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 20:33:40,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 20:33:40,686 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:40,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:40,687 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2020-08-21 20:33:40,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:40,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763416616] [2020-08-21 20:33:40,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:40,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 20:33:40,713 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 20:33:40,713 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 20:33:40,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 20:33:40,766 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 08:33:40 BoogieIcfgContainer [2020-08-21 20:33:40,766 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 20:33:40,771 INFO L168 Benchmark]: Toolchain (without parser) took 4407.40 ms. Allocated memory was 141.0 MB in the beginning and 281.5 MB in the end (delta: 140.5 MB). Free memory was 104.5 MB in the beginning and 192.4 MB in the end (delta: -88.0 MB). Peak memory consumption was 52.6 MB. Max. memory is 7.1 GB. [2020-08-21 20:33:40,772 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 141.0 MB. Free memory was 122.6 MB in the beginning and 122.4 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 20:33:40,773 INFO L168 Benchmark]: CACSL2BoogieTranslator took 242.23 ms. Allocated memory is still 141.0 MB. Free memory was 104.2 MB in the beginning and 94.9 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-21 20:33:40,777 INFO L168 Benchmark]: Boogie Preprocessor took 28.76 ms. Allocated memory is still 141.0 MB. Free memory was 94.9 MB in the beginning and 93.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-08-21 20:33:40,778 INFO L168 Benchmark]: RCFGBuilder took 334.15 ms. Allocated memory was 141.0 MB in the beginning and 203.4 MB in the end (delta: 62.4 MB). Free memory was 93.6 MB in the beginning and 171.4 MB in the end (delta: -77.8 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-08-21 20:33:40,779 INFO L168 Benchmark]: TraceAbstraction took 3796.23 ms. Allocated memory was 203.4 MB in the beginning and 281.5 MB in the end (delta: 78.1 MB). Free memory was 171.4 MB in the beginning and 192.4 MB in the end (delta: -21.0 MB). Peak memory consumption was 57.1 MB. Max. memory is 7.1 GB. [2020-08-21 20:33:40,789 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 141.0 MB. Free memory was 122.6 MB in the beginning and 122.4 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 242.23 ms. Allocated memory is still 141.0 MB. Free memory was 104.2 MB in the beginning and 94.9 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 28.76 ms. Allocated memory is still 141.0 MB. Free memory was 94.9 MB in the beginning and 93.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 334.15 ms. Allocated memory was 141.0 MB in the beginning and 203.4 MB in the end (delta: 62.4 MB). Free memory was 93.6 MB in the beginning and 171.4 MB in the end (delta: -77.8 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3796.23 ms. Allocated memory was 203.4 MB in the beginning and 281.5 MB in the end (delta: 78.1 MB). Free memory was 171.4 MB in the beginning and 192.4 MB in the end (delta: -21.0 MB). Peak memory consumption was 57.1 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 = 10; [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 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); [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: 3.6s, OverallIterations: 11, TraceHistogramMax: 11, AutomataDifference: 1.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 123 SDtfs, 163 SDslu, 394 SDs, 0 SdLazy, 296 SolverSat, 18 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 270 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 1.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=45occurred in iteration=10, 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, 10 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 2.0s InterpolantComputationTime, 473 NumberOfCodeBlocks, 473 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 390 ConstructedInterpolants, 0 QuantifiedInterpolants, 43800 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 10 InterpolantComputations, 1 PerfectInterpolantSequences, 450/900 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...