/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.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-267fbe0 [2020-07-17 17:07:12,326 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-17 17:07:12,329 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-17 17:07:12,346 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-17 17:07:12,347 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-17 17:07:12,348 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-17 17:07:12,350 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-17 17:07:12,360 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-17 17:07:12,363 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-17 17:07:12,367 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-17 17:07:12,369 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-17 17:07:12,371 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-17 17:07:12,371 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-17 17:07:12,373 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-17 17:07:12,375 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-17 17:07:12,376 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-17 17:07:12,378 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-17 17:07:12,378 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-17 17:07:12,380 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-17 17:07:12,384 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-17 17:07:12,389 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-17 17:07:12,392 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-17 17:07:12,393 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-17 17:07:12,394 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-17 17:07:12,396 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-17 17:07:12,397 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-17 17:07:12,397 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-17 17:07:12,399 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-17 17:07:12,400 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-17 17:07:12,400 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-17 17:07:12,401 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-17 17:07:12,402 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-17 17:07:12,403 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-17 17:07:12,403 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-17 17:07:12,405 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-17 17:07:12,405 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-17 17:07:12,405 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-17 17:07:12,406 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-17 17:07:12,406 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-17 17:07:12,407 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-17 17:07:12,408 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-17 17:07:12,409 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-07-17 17:07:12,432 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-17 17:07:12,432 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-17 17:07:12,434 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-17 17:07:12,434 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-17 17:07:12,434 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-17 17:07:12,434 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-17 17:07:12,434 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-17 17:07:12,435 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-17 17:07:12,435 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-17 17:07:12,435 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-17 17:07:12,436 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-17 17:07:12,436 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-17 17:07:12,436 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-17 17:07:12,436 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-17 17:07:12,437 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-17 17:07:12,437 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-07-17 17:07:12,437 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-17 17:07:12,437 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-17 17:07:12,438 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-17 17:07:12,438 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-17 17:07:12,438 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-07-17 17:07:12,438 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-17 17:07:12,438 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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: Use separate solver for trace checks -> true [2020-07-17 17:07:12,714 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-17 17:07:12,730 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-17 17:07:12,733 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-17 17:07:12,735 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-17 17:07:12,735 INFO L275 PluginConnector]: CDTParser initialized [2020-07-17 17:07:12,736 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-07-17 17:07:12,818 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98aa8977f/442f93aa775f4ab9be5bef6084548b13/FLAGcfd7c6890 [2020-07-17 17:07:13,260 INFO L306 CDTParser]: Found 1 translation units. [2020-07-17 17:07:13,261 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-07-17 17:07:13,267 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98aa8977f/442f93aa775f4ab9be5bef6084548b13/FLAGcfd7c6890 [2020-07-17 17:07:13,631 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98aa8977f/442f93aa775f4ab9be5bef6084548b13 [2020-07-17 17:07:13,639 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-17 17:07:13,641 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-17 17:07:13,642 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-17 17:07:13,642 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-17 17:07:13,646 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-17 17:07:13,647 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 05:07:13" (1/1) ... [2020-07-17 17:07:13,650 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4933b86b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:07:13, skipping insertion in model container [2020-07-17 17:07:13,650 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 05:07:13" (1/1) ... [2020-07-17 17:07:13,657 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-17 17:07:13,669 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-17 17:07:13,818 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 17:07:13,823 INFO L203 MainTranslator]: Completed pre-run [2020-07-17 17:07:13,835 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 17:07:13,848 INFO L208 MainTranslator]: Completed translation [2020-07-17 17:07:13,848 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:07:13 WrapperNode [2020-07-17 17:07:13,848 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-17 17:07:13,849 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-17 17:07:13,849 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-17 17:07:13,849 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-17 17:07:13,859 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:07:13" (1/1) ... [2020-07-17 17:07:13,859 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:07:13" (1/1) ... [2020-07-17 17:07:13,863 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:07:13" (1/1) ... [2020-07-17 17:07:13,863 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:07:13" (1/1) ... [2020-07-17 17:07:13,866 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:07:13" (1/1) ... [2020-07-17 17:07:13,868 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:07:13" (1/1) ... [2020-07-17 17:07:13,869 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:07:13" (1/1) ... [2020-07-17 17:07:13,870 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-17 17:07:13,870 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-17 17:07:13,871 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-17 17:07:13,871 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-17 17:07:13,872 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:07:13" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-17 17:07:14,013 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-17 17:07:14,013 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-17 17:07:14,013 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-07-17 17:07:14,014 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-07-17 17:07:14,014 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-17 17:07:14,014 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-17 17:07:14,014 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-07-17 17:07:14,014 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-07-17 17:07:14,014 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-17 17:07:14,014 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-17 17:07:14,014 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-17 17:07:14,165 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-17 17:07:14,165 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-17 17:07:14,169 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 05:07:14 BoogieIcfgContainer [2020-07-17 17:07:14,170 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-17 17:07:14,171 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-17 17:07:14,171 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-17 17:07:14,174 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-17 17:07:14,175 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.07 05:07:13" (1/3) ... [2020-07-17 17:07:14,176 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47ccf9be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 05:07:14, skipping insertion in model container [2020-07-17 17:07:14,176 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:07:13" (2/3) ... [2020-07-17 17:07:14,176 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47ccf9be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 05:07:14, skipping insertion in model container [2020-07-17 17:07:14,177 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 05:07:14" (3/3) ... [2020-07-17 17:07:14,178 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-07-17 17:07:14,188 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-07-17 17:07:14,195 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-07-17 17:07:14,210 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-07-17 17:07:14,232 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-17 17:07:14,232 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-17 17:07:14,232 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-07-17 17:07:14,232 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-17 17:07:14,233 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-17 17:07:14,233 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-17 17:07:14,233 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-17 17:07:14,233 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-17 17:07:14,252 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-17 17:07:14,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-17 17:07:14,262 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:07:14,263 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 17:07:14,263 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:07:14,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:07:14,270 INFO L82 PathProgramCache]: Analyzing trace with hash 1612791331, now seen corresponding path program 1 times [2020-07-17 17:07:14,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:07:14,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1031310418] [2020-07-17 17:07:14,280 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:07:14,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:07:14,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:07:14,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:07:14,549 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 17:07:14,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1031310418] [2020-07-17 17:07:14,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 17:07:14,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-17 17:07:14,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876943771] [2020-07-17 17:07:14,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-17 17:07:14,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 17:07:14,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-17 17:07:14,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-17 17:07:14,575 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 8 states. [2020-07-17 17:07:14,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 17:07:14,780 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2020-07-17 17:07:14,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-17 17:07:14,782 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2020-07-17 17:07:14,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 17:07:14,792 INFO L225 Difference]: With dead ends: 43 [2020-07-17 17:07:14,792 INFO L226 Difference]: Without dead ends: 31 [2020-07-17 17:07:14,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2020-07-17 17:07:14,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-17 17:07:14,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-17 17:07:14,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-17 17:07:14,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-07-17 17:07:14,846 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 16 [2020-07-17 17:07:14,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 17:07:14,847 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-07-17 17:07:14,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-17 17:07:14,847 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-07-17 17:07:14,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-17 17:07:14,848 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:07:14,848 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 17:07:14,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-17 17:07:14,849 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:07:14,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:07:14,850 INFO L82 PathProgramCache]: Analyzing trace with hash 107301256, now seen corresponding path program 1 times [2020-07-17 17:07:14,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:07:14,851 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [681757659] [2020-07-17 17:07:14,851 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:07:14,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-17 17:07:14,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-17 17:07:14,910 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-17 17:07:14,911 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-17 17:07:14,912 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-17 17:07:14,937 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.07 05:07:14 BoogieIcfgContainer [2020-07-17 17:07:14,938 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-17 17:07:14,941 INFO L168 Benchmark]: Toolchain (without parser) took 1299.46 ms. Allocated memory was 145.8 MB in the beginning and 203.4 MB in the end (delta: 57.7 MB). Free memory was 103.6 MB in the beginning and 127.1 MB in the end (delta: -23.5 MB). Peak memory consumption was 34.2 MB. Max. memory is 7.1 GB. [2020-07-17 17:07:14,942 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 145.8 MB. Free memory was 122.2 MB in the beginning and 122.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-17 17:07:14,943 INFO L168 Benchmark]: CACSL2BoogieTranslator took 206.66 ms. Allocated memory is still 145.8 MB. Free memory was 103.2 MB in the beginning and 94.3 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. [2020-07-17 17:07:14,944 INFO L168 Benchmark]: Boogie Preprocessor took 21.02 ms. Allocated memory is still 145.8 MB. Free memory was 94.3 MB in the beginning and 93.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-17 17:07:14,945 INFO L168 Benchmark]: RCFGBuilder took 299.30 ms. Allocated memory was 145.8 MB in the beginning and 203.4 MB in the end (delta: 57.7 MB). Free memory was 93.0 MB in the beginning and 171.2 MB in the end (delta: -78.3 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-17 17:07:14,946 INFO L168 Benchmark]: TraceAbstraction took 767.05 ms. Allocated memory is still 203.4 MB. Free memory was 170.6 MB in the beginning and 127.1 MB in the end (delta: 43.5 MB). Peak memory consumption was 43.5 MB. Max. memory is 7.1 GB. [2020-07-17 17:07:14,950 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 145.8 MB. Free memory was 122.2 MB in the beginning and 122.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 206.66 ms. Allocated memory is still 145.8 MB. Free memory was 103.2 MB in the beginning and 94.3 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 21.02 ms. Allocated memory is still 145.8 MB. Free memory was 94.3 MB in the beginning and 93.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 299.30 ms. Allocated memory was 145.8 MB in the beginning and 203.4 MB in the end (delta: 57.7 MB). Free memory was 93.0 MB in the beginning and 171.2 MB in the end (delta: -78.3 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 767.05 ms. Allocated memory is still 203.4 MB. Free memory was 170.6 MB in the beginning and 127.1 MB in the end (delta: 43.5 MB). Peak memory consumption was 43.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 17]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L21] CALL f(4) VAL [\old(n)=4] [L7] COND FALSE !(n<3) VAL [\old(n)=4, n=4] [L8] n-- VAL [\old(n)=4, n=3] [L9] CALL f2(n) VAL [\old(n)=3] [L14] COND FALSE !(n<3) VAL [\old(n)=3, n=3] [L15] n-- VAL [\old(n)=3, n=2] [L16] CALL f(n) VAL [\old(n)=2] [L7] COND TRUE n<3 VAL [\old(n)=2, n=2] [L16] RET f(n) VAL [\old(n)=3, n=2] [L17] __VERIFIER_error() VAL [\old(n)=3, n=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 29 locations, 2 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.6s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 17 SDtfs, 11 SDslu, 92 SDs, 0 SdLazy, 56 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=31occurred in iteration=1, 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, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.1s InterpolantComputationTime, 38 NumberOfCodeBlocks, 38 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 15 ConstructedInterpolants, 0 QuantifiedInterpolants, 495 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 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...