/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/id2_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:08:06,247 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:08:06,250 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:08:06,290 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:08:06,292 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:08:06,293 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:08:06,294 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:08:06,302 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:08:06,303 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:08:06,304 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:08:06,307 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:08:06,308 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:08:06,309 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:08:06,309 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:08:06,314 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:08:06,317 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:08:06,318 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:08:06,319 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:08:06,323 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:08:06,326 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:08:06,327 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:08:06,328 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:08:06,333 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:08:06,335 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:08:06,339 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 18:08:06,340 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 18:08:06,340 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 18:08:06,341 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 18:08:06,341 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 18:08:06,344 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 18:08:06,344 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 18:08:06,345 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 18:08:06,346 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 18:08:06,346 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 18:08:06,349 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 18:08:06,349 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 18:08:06,350 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 18:08:06,350 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 18:08:06,350 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:08:06,351 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:08:06,352 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:08:06,353 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 18:08:06,397 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:08:06,397 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:08:06,399 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:08:06,399 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:08:06,399 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:08:06,399 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:08:06,400 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:08:06,400 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:08:06,400 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:08:06,400 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:08:06,400 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:08:06,400 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:08:06,401 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:08:06,401 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:08:06,401 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:08:06,401 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:08:06,401 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:08:06,402 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:08:06,404 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:08:06,404 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:08:06,404 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:08:06,404 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:08:06,405 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:08:06,405 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:08:06,405 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:08:06,405 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:08:06,405 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:08:06,405 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:08:06,406 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:08:06,406 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 18:08:06,730 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:08:06,752 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:08:06,758 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:08:06,760 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:08:06,761 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:08:06,761 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-08-21 18:08:06,822 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/06fc7a0e8/17b796682cb54e7eb5fcee240e336548/FLAG5252ac6a2 [2020-08-21 18:08:07,255 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:08:07,256 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-08-21 18:08:07,263 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/06fc7a0e8/17b796682cb54e7eb5fcee240e336548/FLAG5252ac6a2 [2020-08-21 18:08:07,642 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/06fc7a0e8/17b796682cb54e7eb5fcee240e336548 [2020-08-21 18:08:07,654 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:08:07,656 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:08:07,660 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:08:07,660 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:08:07,664 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:08:07,665 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:08:07" (1/1) ... [2020-08-21 18:08:07,668 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54f5b696 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:07, skipping insertion in model container [2020-08-21 18:08:07,668 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:08:07" (1/1) ... [2020-08-21 18:08:07,676 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:08:07,690 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:08:07,860 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:08:07,864 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:08:07,880 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:08:07,893 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:08:07,894 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:07 WrapperNode [2020-08-21 18:08:07,894 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:08:07,895 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:08:07,895 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:08:07,895 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:08:07,906 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:07" (1/1) ... [2020-08-21 18:08:07,906 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:07" (1/1) ... [2020-08-21 18:08:07,988 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:07" (1/1) ... [2020-08-21 18:08:07,989 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:07" (1/1) ... [2020-08-21 18:08:07,993 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:07" (1/1) ... [2020-08-21 18:08:07,995 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:07" (1/1) ... [2020-08-21 18:08:07,996 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:07" (1/1) ... [2020-08-21 18:08:07,997 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:08:07,998 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:08:07,998 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:08:07,998 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:08:07,999 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:07" (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 18:08:08,067 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:08:08,067 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:08:08,068 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-08-21 18:08:08,068 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-08-21 18:08:08,069 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:08:08,069 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 18:08:08,069 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:08:08,069 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-08-21 18:08:08,069 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-08-21 18:08:08,070 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:08:08,070 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:08:08,070 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:08:08,253 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:08:08,253 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 18:08:08,257 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:08:08 BoogieIcfgContainer [2020-08-21 18:08:08,258 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:08:08,259 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:08:08,259 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:08:08,262 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:08:08,263 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:08:07" (1/3) ... [2020-08-21 18:08:08,263 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44099e41 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:08:08, skipping insertion in model container [2020-08-21 18:08:08,264 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:08:07" (2/3) ... [2020-08-21 18:08:08,264 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44099e41 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:08:08, skipping insertion in model container [2020-08-21 18:08:08,264 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:08:08" (3/3) ... [2020-08-21 18:08:08,266 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2020-08-21 18:08:08,277 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:08:08,284 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:08:08,298 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:08:08,324 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:08:08,324 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:08:08,324 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:08:08,325 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:08:08,325 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:08:08,325 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:08:08,325 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:08:08,325 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:08:08,342 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-08-21 18:08:08,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 18:08:08,348 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:08,349 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:08,350 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:08,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:08,355 INFO L82 PathProgramCache]: Analyzing trace with hash -550894517, now seen corresponding path program 1 times [2020-08-21 18:08:08,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:08,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [356424630] [2020-08-21 18:08:08,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:08,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:08,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:08,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:08,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:08,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:08,723 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 18:08:08,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [356424630] [2020-08-21 18:08:08,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:08:08,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 18:08:08,731 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388204404] [2020-08-21 18:08:08,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:08:08,741 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:08,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:08:08,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:08:08,761 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2020-08-21 18:08:08,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:08,852 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-08-21 18:08:08,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:08:08,854 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 18:08:08,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:08,864 INFO L225 Difference]: With dead ends: 36 [2020-08-21 18:08:08,864 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 18:08:08,867 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:08:08,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 18:08:08,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 18:08:08,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 18:08:08,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-21 18:08:08,911 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 13 [2020-08-21 18:08:08,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:08,912 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-21 18:08:08,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:08:08,912 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-21 18:08:08,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 18:08:08,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:08,914 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:08,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:08:08,915 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:08,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:08,916 INFO L82 PathProgramCache]: Analyzing trace with hash 40504409, now seen corresponding path program 1 times [2020-08-21 18:08:08,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:08,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1823832012] [2020-08-21 18:08:08,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:08,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:08,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:08,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:08,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:08,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:09,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,041 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 18:08:09,042 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1823832012] [2020-08-21 18:08:09,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:08:09,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-21 18:08:09,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872558969] [2020-08-21 18:08:09,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 18:08:09,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:09,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 18:08:09,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:08:09,046 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2020-08-21 18:08:09,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:09,136 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2020-08-21 18:08:09,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 18:08:09,137 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-08-21 18:08:09,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:09,138 INFO L225 Difference]: With dead ends: 33 [2020-08-21 18:08:09,139 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 18:08:09,140 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:08:09,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 18:08:09,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-08-21 18:08:09,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 18:08:09,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-08-21 18:08:09,148 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 19 [2020-08-21 18:08:09,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:09,149 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-08-21 18:08:09,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 18:08:09,149 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-08-21 18:08:09,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 18:08:09,151 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:09,151 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:09,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:08:09,151 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:09,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:09,152 INFO L82 PathProgramCache]: Analyzing trace with hash 1029702107, now seen corresponding path program 1 times [2020-08-21 18:08:09,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:09,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1785180573] [2020-08-21 18:08:09,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:09,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:09,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:09,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:09,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:09,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,343 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 18:08:09,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1785180573] [2020-08-21 18:08:09,344 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:09,344 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 18:08:09,344 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277440079] [2020-08-21 18:08:09,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 18:08:09,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:09,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 18:08:09,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:08:09,346 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 8 states. [2020-08-21 18:08:09,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:09,443 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2020-08-21 18:08:09,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 18:08:09,444 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-08-21 18:08:09,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:09,446 INFO L225 Difference]: With dead ends: 39 [2020-08-21 18:08:09,446 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 18:08:09,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:08:09,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 18:08:09,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2020-08-21 18:08:09,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 18:08:09,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-21 18:08:09,456 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2020-08-21 18:08:09,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:09,456 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-21 18:08:09,456 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 18:08:09,457 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-21 18:08:09,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 18:08:09,458 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:09,458 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:09,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:08:09,459 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:09,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:09,460 INFO L82 PathProgramCache]: Analyzing trace with hash -559715991, now seen corresponding path program 1 times [2020-08-21 18:08:09,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:09,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1579525419] [2020-08-21 18:08:09,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:09,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:09,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:09,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:09,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:09,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:09,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,671 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:08:09,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1579525419] [2020-08-21 18:08:09,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:09,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 18:08:09,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295563982] [2020-08-21 18:08:09,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 18:08:09,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:09,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 18:08:09,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:08:09,674 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 9 states. [2020-08-21 18:08:09,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:09,765 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2020-08-21 18:08:09,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 18:08:09,766 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-21 18:08:09,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:09,767 INFO L225 Difference]: With dead ends: 45 [2020-08-21 18:08:09,767 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 18:08:09,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:08:09,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 18:08:09,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2020-08-21 18:08:09,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 18:08:09,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-08-21 18:08:09,776 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 31 [2020-08-21 18:08:09,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:09,776 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-08-21 18:08:09,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 18:08:09,777 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-08-21 18:08:09,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 18:08:09,778 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:09,778 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:09,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:08:09,778 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:09,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:09,779 INFO L82 PathProgramCache]: Analyzing trace with hash 2003326827, now seen corresponding path program 2 times [2020-08-21 18:08:09,779 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:09,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052520996] [2020-08-21 18:08:09,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:09,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:08:09,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:08:09,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:09,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:09,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:09,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:08:09,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:08:09,954 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-08-21 18:08:09,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052520996] [2020-08-21 18:08:09,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:08:09,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 18:08:09,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159856423] [2020-08-21 18:08:09,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 18:08:09,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:08:09,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 18:08:09,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:08:09,958 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 10 states. [2020-08-21 18:08:10,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:08:10,086 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-21 18:08:10,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 18:08:10,087 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2020-08-21 18:08:10,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:08:10,089 INFO L225 Difference]: With dead ends: 51 [2020-08-21 18:08:10,089 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 18:08:10,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-08-21 18:08:10,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 18:08:10,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 36. [2020-08-21 18:08:10,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 18:08:10,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-21 18:08:10,107 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 37 [2020-08-21 18:08:10,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:08:10,107 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-21 18:08:10,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 18:08:10,107 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-21 18:08:10,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 18:08:10,110 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:08:10,110 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:08:10,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 18:08:10,111 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:08:10,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:08:10,111 INFO L82 PathProgramCache]: Analyzing trace with hash 1197899385, now seen corresponding path program 2 times [2020-08-21 18:08:10,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:08:10,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [829030975] [2020-08-21 18:08:10,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:08:10,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 18:08:10,140 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 18:08:10,143 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 18:08:10,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 18:08:10,192 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 06:08:10 BoogieIcfgContainer [2020-08-21 18:08:10,192 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 18:08:10,195 INFO L168 Benchmark]: Toolchain (without parser) took 2538.67 ms. Allocated memory was 142.1 MB in the beginning and 232.3 MB in the end (delta: 90.2 MB). Free memory was 104.4 MB in the beginning and 136.9 MB in the end (delta: -32.5 MB). Peak memory consumption was 57.7 MB. Max. memory is 7.1 GB. [2020-08-21 18:08:10,196 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 142.1 MB. Free memory was 122.4 MB in the beginning and 122.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 18:08:10,200 INFO L168 Benchmark]: CACSL2BoogieTranslator took 234.72 ms. Allocated memory is still 142.1 MB. Free memory was 104.0 MB in the beginning and 94.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-08-21 18:08:10,202 INFO L168 Benchmark]: Boogie Preprocessor took 102.71 ms. Allocated memory was 142.1 MB in the beginning and 204.5 MB in the end (delta: 62.4 MB). Free memory was 94.5 MB in the beginning and 183.6 MB in the end (delta: -89.2 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. [2020-08-21 18:08:10,204 INFO L168 Benchmark]: RCFGBuilder took 259.97 ms. Allocated memory is still 204.5 MB. Free memory was 183.6 MB in the beginning and 171.1 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. [2020-08-21 18:08:10,206 INFO L168 Benchmark]: TraceAbstraction took 1933.62 ms. Allocated memory was 204.5 MB in the beginning and 232.3 MB in the end (delta: 27.8 MB). Free memory was 170.5 MB in the beginning and 136.9 MB in the end (delta: 33.6 MB). Peak memory consumption was 61.4 MB. Max. memory is 7.1 GB. [2020-08-21 18:08:10,211 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 142.1 MB. Free memory was 122.4 MB in the beginning and 122.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 234.72 ms. Allocated memory is still 142.1 MB. Free memory was 104.0 MB in the beginning and 94.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 102.71 ms. Allocated memory was 142.1 MB in the beginning and 204.5 MB in the end (delta: 62.4 MB). Free memory was 94.5 MB in the beginning and 183.6 MB in the end (delta: -89.2 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 259.97 ms. Allocated memory is still 204.5 MB. Free memory was 183.6 MB in the beginning and 171.1 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1933.62 ms. Allocated memory was 204.5 MB in the beginning and 232.3 MB in the end (delta: 27.8 MB). Free memory was 170.5 MB in the beginning and 136.9 MB in the end (delta: 33.6 MB). Peak memory consumption was 61.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 21]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L18] int input = 5; [L19] CALL, EXPR id(input) [L8] COND FALSE !(x==0) [L9] CALL, EXPR id2(x-1) [L13] COND FALSE !(x==0) [L14] CALL, EXPR id(x-1) [L8] COND FALSE !(x==0) [L9] CALL, EXPR id2(x-1) [L13] COND FALSE !(x==0) [L14] CALL, EXPR id(x-1) [L8] COND FALSE !(x==0) [L9] CALL, EXPR id2(x-1) [L13] COND TRUE x==0 [L13] return 0; [L9] RET, EXPR id2(x-1) [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) [L9] return id2(x-1) + 1; [L19] RET, EXPR id(input) [L19] int result = id(input); [L20] COND TRUE result == 5 [L21] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.8s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 92 SDtfs, 71 SDslu, 374 SDs, 0 SdLazy, 210 SolverSat, 8 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 85 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=36occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 26 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 168 NumberOfCodeBlocks, 168 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 120 ConstructedInterpolants, 0 QuantifiedInterpolants, 7200 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 2 PerfectInterpolantSequences, 17/34 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...