/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 10:50:54,326 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 10:50:54,329 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 10:50:54,347 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 10:50:54,347 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 10:50:54,348 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 10:50:54,350 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 10:50:54,352 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 10:50:54,355 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 10:50:54,356 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 10:50:54,357 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 10:50:54,358 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 10:50:54,359 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 10:50:54,360 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 10:50:54,361 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 10:50:54,362 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 10:50:54,363 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 10:50:54,365 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 10:50:54,368 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 10:50:54,371 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 10:50:54,373 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 10:50:54,375 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 10:50:54,377 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 10:50:54,378 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 10:50:54,381 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 10:50:54,389 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 10:50:54,390 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 10:50:54,390 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 10:50:54,391 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 10:50:54,414 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 10:50:54,414 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 10:50:54,416 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 10:50:54,416 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 10:50:54,416 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 10:50:54,417 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 10:50:54,417 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 10:50:54,417 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 10:50:54,417 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 10:50:54,417 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 10:50:54,417 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 10:50:54,418 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 10:50:54,418 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 10:50:54,418 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 10:50:54,418 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 10:50:54,419 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 10:50:54,419 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 10:50:54,419 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 10:50:54,420 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 10:50:54,420 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 10:50:54,420 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 10:50:54,420 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 10:50:54,421 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 10:50:54,421 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 10:50:54,421 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 10:50:54,421 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 10:50:54,421 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:50:54,421 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 10:50:54,422 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 10:50:54,422 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 -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 10:50:54,737 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 10:50:54,753 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 10:50:54,756 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 10:50:54,758 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 10:50:54,759 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 10:50:54,760 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-07-20 10:50:54,832 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf96bddc1/eeb604aff03f43b2961535ff0094dc0c/FLAG7e52a9e08 [2020-07-20 10:50:55,294 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 10:50:55,294 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-07-20 10:50:55,301 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf96bddc1/eeb604aff03f43b2961535ff0094dc0c/FLAG7e52a9e08 [2020-07-20 10:50:55,644 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf96bddc1/eeb604aff03f43b2961535ff0094dc0c [2020-07-20 10:50:55,656 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 10:50:55,659 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 10:50:55,661 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 10:50:55,661 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 10:50:55,665 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 10:50:55,666 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:50:55" (1/1) ... [2020-07-20 10:50:55,669 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5e4a8101 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:55, skipping insertion in model container [2020-07-20 10:50:55,670 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:50:55" (1/1) ... [2020-07-20 10:50:55,680 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 10:50:55,701 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 10:50:55,888 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 10:50:55,896 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 10:50:55,914 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 10:50:55,929 INFO L208 MainTranslator]: Completed translation [2020-07-20 10:50:55,929 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:55 WrapperNode [2020-07-20 10:50:55,929 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 10:50:55,930 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 10:50:55,930 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 10:50:55,930 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 10:50:55,946 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:55" (1/1) ... [2020-07-20 10:50:55,949 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:55" (1/1) ... [2020-07-20 10:50:55,956 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:55" (1/1) ... [2020-07-20 10:50:55,957 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:55" (1/1) ... [2020-07-20 10:50:55,960 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:55" (1/1) ... [2020-07-20 10:50:55,962 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:55" (1/1) ... [2020-07-20 10:50:55,963 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:55" (1/1) ... [2020-07-20 10:50:55,966 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 10:50:55,966 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 10:50:55,967 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 10:50:55,967 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 10:50:55,968 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:55" (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 [2020-07-20 10:50:56,135 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 10:50:56,136 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 10:50:56,136 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-07-20 10:50:56,136 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-07-20 10:50:56,136 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 10:50:56,136 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 10:50:56,137 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-07-20 10:50:56,137 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-07-20 10:50:56,137 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 10:50:56,137 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 10:50:56,137 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 10:50:56,332 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 10:50:56,333 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 10:50:56,337 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:50:56 BoogieIcfgContainer [2020-07-20 10:50:56,338 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 10:50:56,339 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 10:50:56,339 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 10:50:56,344 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 10:50:56,344 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:50:55" (1/3) ... [2020-07-20 10:50:56,346 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4500adc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:50:56, skipping insertion in model container [2020-07-20 10:50:56,346 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:55" (2/3) ... [2020-07-20 10:50:56,347 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4500adc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:50:56, skipping insertion in model container [2020-07-20 10:50:56,347 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:50:56" (3/3) ... [2020-07-20 10:50:56,349 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-07-20 10:50:56,360 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 10:50:56,369 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-07-20 10:50:56,387 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-07-20 10:50:56,415 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 10:50:56,416 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 10:50:56,416 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 10:50:56,416 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 10:50:56,417 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 10:50:56,417 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 10:50:56,417 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 10:50:56,417 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 10:50:56,439 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-20 10:50:56,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 10:50:56,447 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:50:56,448 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:50:56,449 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:50:56,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:50:56,457 INFO L82 PathProgramCache]: Analyzing trace with hash -1662209305, now seen corresponding path program 1 times [2020-07-20 10:50:56,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:50:56,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [786795562] [2020-07-20 10:50:56,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:50:56,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:50:56,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 10:50:56,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:50:56,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:50:56,701 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 10:50:56,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [786795562] [2020-07-20 10:50:56,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 10:50:56,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 10:50:56,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591288850] [2020-07-20 10:50:56,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 10:50:56,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:50:56,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 10:50:56,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-07-20 10:50:56,732 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 7 states. [2020-07-20 10:50:56,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:50:56,890 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-07-20 10:50:56,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 10:50:56,893 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-07-20 10:50:56,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:50:56,904 INFO L225 Difference]: With dead ends: 34 [2020-07-20 10:50:56,905 INFO L226 Difference]: Without dead ends: 22 [2020-07-20 10:50:56,910 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-07-20 10:50:56,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-20 10:50:56,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-20 10:50:56,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 10:50:56,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-07-20 10:50:56,961 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 13 [2020-07-20 10:50:56,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:50:56,962 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-07-20 10:50:56,962 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 10:50:56,963 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-07-20 10:50:56,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 10:50:56,964 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:50:56,964 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:50:57,179 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:50:57,179 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:50:57,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:50:57,180 INFO L82 PathProgramCache]: Analyzing trace with hash -1078403623, now seen corresponding path program 1 times [2020-07-20 10:50:57,180 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:50:57,180 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1755116639] [2020-07-20 10:50:57,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:50:57,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 10:50:57,213 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 10:50:57,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 10:50:57,222 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 10:50:57,234 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 10:50:57,235 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 10:50:57,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:50:57,476 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 10:50:57 BoogieIcfgContainer [2020-07-20 10:50:57,477 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 10:50:57,480 INFO L168 Benchmark]: Toolchain (without parser) took 1821.08 ms. Allocated memory was 143.1 MB in the beginning and 201.9 MB in the end (delta: 58.7 MB). Free memory was 102.2 MB in the beginning and 130.6 MB in the end (delta: -28.4 MB). Peak memory consumption was 30.3 MB. Max. memory is 7.1 GB. [2020-07-20 10:50:57,481 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 143.1 MB. Free memory was 120.6 MB in the beginning and 120.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 10:50:57,482 INFO L168 Benchmark]: CACSL2BoogieTranslator took 269.02 ms. Allocated memory is still 143.1 MB. Free memory was 101.8 MB in the beginning and 92.8 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2020-07-20 10:50:57,483 INFO L168 Benchmark]: Boogie Preprocessor took 35.66 ms. Allocated memory is still 143.1 MB. Free memory was 92.8 MB in the beginning and 91.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-20 10:50:57,484 INFO L168 Benchmark]: RCFGBuilder took 371.56 ms. Allocated memory was 143.1 MB in the beginning and 201.9 MB in the end (delta: 58.7 MB). Free memory was 91.5 MB in the beginning and 169.7 MB in the end (delta: -78.2 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-20 10:50:57,485 INFO L168 Benchmark]: TraceAbstraction took 1137.65 ms. Allocated memory is still 201.9 MB. Free memory was 169.0 MB in the beginning and 130.6 MB in the end (delta: 38.4 MB). Peak memory consumption was 38.4 MB. Max. memory is 7.1 GB. [2020-07-20 10:50:57,490 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 143.1 MB. Free memory was 120.6 MB in the beginning and 120.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 269.02 ms. Allocated memory is still 143.1 MB. Free memory was 101.8 MB in the beginning and 92.8 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 35.66 ms. Allocated memory is still 143.1 MB. Free memory was 92.8 MB in the beginning and 91.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 371.56 ms. Allocated memory was 143.1 MB in the beginning and 201.9 MB in the end (delta: 58.7 MB). Free memory was 91.5 MB in the beginning and 169.7 MB in the end (delta: -78.2 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1137.65 ms. Allocated memory is still 201.9 MB. Free memory was 169.0 MB in the beginning and 130.6 MB in the end (delta: 38.4 MB). Peak memory consumption was 38.4 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) [L8] n-- VAL [\old(n)=4, n=3] [L9] CALL f2(n) VAL [\old(n)=3] [L14] COND FALSE !(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, 23 locations, 2 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.0s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 14 SDtfs, 3 SDslu, 48 SDs, 0 SdLazy, 28 SolverSat, 3 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=23occurred in iteration=0, 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, 29 NumberOfCodeBlocks, 29 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 12 ConstructedInterpolants, 0 QuantifiedInterpolants, 288 SizeOfPredicates, 3 NumberOfNonLiveVariables, 29 ConjunctsInSsa, 6 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...