/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/id_o3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:09:03,735 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:09:03,738 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:09:03,754 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:09:03,754 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:09:03,756 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:09:03,758 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:09:03,760 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:09:03,763 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:09:03,764 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:09:03,765 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:09:03,767 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:09:03,768 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:09:03,769 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:09:03,771 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:09:03,772 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:09:03,774 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:09:03,775 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:09:03,778 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:09:03,781 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:09:03,783 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:09:03,785 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:09:03,787 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:09:03,788 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:09:03,795 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 11:09:03,820 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:09:03,822 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:09:03,823 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:09:03,824 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 [2020-07-21 11:09:03,842 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:09:03,842 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:09:03,844 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:09:03,844 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:09:03,845 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:09:03,845 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:09:03,845 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:09:03,845 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:09:03,845 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:09:03,845 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:09:03,846 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:09:03,846 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:09:03,846 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:09:03,846 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:09:03,846 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:09:03,847 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:09:03,847 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:09:03,847 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:09:03,847 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:09:03,847 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:09:03,848 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:09:03,848 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:09:03,848 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:09:03,848 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:09:03,849 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:09:03,849 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:09:03,849 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:09:03,849 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:09:03,849 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:09:03,850 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 [2020-07-21 11:09:04,231 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:09:04,253 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:09:04,258 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:09:04,260 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:09:04,261 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:09:04,262 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o3.c [2020-07-21 11:09:04,363 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4d05dd785/38343233a14248cb8c8cd341ec2fa4bb/FLAG5f675455e [2020-07-21 11:09:04,926 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:09:04,927 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o3.c [2020-07-21 11:09:04,936 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4d05dd785/38343233a14248cb8c8cd341ec2fa4bb/FLAG5f675455e [2020-07-21 11:09:05,278 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4d05dd785/38343233a14248cb8c8cd341ec2fa4bb [2020-07-21 11:09:05,290 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:09:05,294 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:09:05,296 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:09:05,296 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:09:05,301 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:09:05,302 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:09:05" (1/1) ... [2020-07-21 11:09:05,307 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@77f6cffd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:09:05, skipping insertion in model container [2020-07-21 11:09:05,307 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:09:05" (1/1) ... [2020-07-21 11:09:05,318 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:09:05,339 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:09:05,522 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:09:05,529 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:09:05,548 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:09:05,568 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:09:05,569 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:09:05 WrapperNode [2020-07-21 11:09:05,569 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:09:05,570 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:09:05,571 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:09:05,571 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:09:05,590 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:09:05" (1/1) ... [2020-07-21 11:09:05,591 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:09:05" (1/1) ... [2020-07-21 11:09:05,598 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:09:05" (1/1) ... [2020-07-21 11:09:05,599 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:09:05" (1/1) ... [2020-07-21 11:09:05,604 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:09:05" (1/1) ... [2020-07-21 11:09:05,607 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:09:05" (1/1) ... [2020-07-21 11:09:05,609 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:09:05" (1/1) ... [2020-07-21 11:09:05,611 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:09:05,612 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:09:05,612 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:09:05,612 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:09:05,613 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:09:05" (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 [2020-07-21 11:09:05,801 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:09:05,801 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:09:05,801 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 11:09:05,801 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:09:05,801 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 11:09:05,802 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:09:05,802 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 11:09:05,802 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:09:05,802 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:09:05,802 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:09:05,996 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:09:05,997 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 11:09:06,002 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:09:06 BoogieIcfgContainer [2020-07-21 11:09:06,003 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:09:06,004 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:09:06,005 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:09:06,009 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:09:06,010 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:09:05" (1/3) ... [2020-07-21 11:09:06,011 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b25b9f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:09:06, skipping insertion in model container [2020-07-21 11:09:06,012 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:09:05" (2/3) ... [2020-07-21 11:09:06,013 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b25b9f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:09:06, skipping insertion in model container [2020-07-21 11:09:06,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:09:06" (3/3) ... [2020-07-21 11:09:06,016 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o3.c [2020-07-21 11:09:06,030 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:09:06,039 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:09:06,058 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:09:06,092 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:09:06,092 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:09:06,092 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:09:06,093 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:09:06,093 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:09:06,093 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:09:06,093 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:09:06,094 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:09:06,116 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 11:09:06,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 11:09:06,123 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:09:06,124 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:09:06,125 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:09:06,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:09:06,133 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 11:09:06,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:09:06,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1615198818] [2020-07-21 11:09:06,144 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 [2020-07-21 11:09:06,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:09:06,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 11:09:06,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:09:06,392 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:09:06,392 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:09:06,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1615198818] [2020-07-21 11:09:06,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:09:06,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 11:09:06,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2663318] [2020-07-21 11:09:06,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 11:09:06,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:09:06,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 11:09:06,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 11:09:06,425 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 11:09:06,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:09:06,494 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-21 11:09:06,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 11:09:06,496 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 11:09:06,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:09:06,509 INFO L225 Difference]: With dead ends: 32 [2020-07-21 11:09:06,509 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 11:09:06,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 11:09:06,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 11:09:06,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 11:09:06,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 11:09:06,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 11:09:06,569 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 11:09:06,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:09:06,570 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 11:09:06,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 11:09:06,570 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 11:09:06,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 11:09:06,572 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:09:06,572 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:09:06,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:09:06,786 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:09:06,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:09:06,787 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 11:09:06,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:09:06,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [987554575] [2020-07-21 11:09:06,788 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 [2020-07-21 11:09:06,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:09:06,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 11:09:06,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:09:06,914 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 11:09:06,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:09:07,154 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 11:09:07,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [987554575] [2020-07-21 11:09:07,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:09:07,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 11:09:07,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19000716] [2020-07-21 11:09:07,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 11:09:07,159 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:09:07,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 11:09:07,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 11:09:07,160 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-21 11:09:07,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:09:07,231 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-21 11:09:07,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 11:09:07,232 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-21 11:09:07,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:09:07,234 INFO L225 Difference]: With dead ends: 30 [2020-07-21 11:09:07,234 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 11:09:07,236 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 11:09:07,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 11:09:07,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 11:09:07,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 11:09:07,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 11:09:07,245 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-21 11:09:07,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:09:07,246 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 11:09:07,246 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 11:09:07,246 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 11:09:07,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 11:09:07,248 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:09:07,248 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:09:07,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:09:07,464 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:09:07,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:09:07,464 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-21 11:09:07,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:09:07,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [360395832] [2020-07-21 11:09:07,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:09:07,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:09:07,501 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:09:07,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:09:07,516 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:09:07,540 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 11:09:07,540 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 11:09:07,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:09:07,792 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:09:07 BoogieIcfgContainer [2020-07-21 11:09:07,793 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 11:09:07,798 INFO L168 Benchmark]: Toolchain (without parser) took 2503.33 ms. Allocated memory was 144.2 MB in the beginning and 201.9 MB in the end (delta: 57.7 MB). Free memory was 102.0 MB in the beginning and 104.8 MB in the end (delta: -2.8 MB). Peak memory consumption was 54.9 MB. Max. memory is 7.1 GB. [2020-07-21 11:09:07,801 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 144.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 11:09:07,804 INFO L168 Benchmark]: CACSL2BoogieTranslator took 274.14 ms. Allocated memory is still 144.2 MB. Free memory was 101.6 MB in the beginning and 92.4 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-21 11:09:07,807 INFO L168 Benchmark]: Boogie Preprocessor took 40.70 ms. Allocated memory is still 144.2 MB. Free memory was 92.4 MB in the beginning and 91.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 11:09:07,809 INFO L168 Benchmark]: RCFGBuilder took 391.29 ms. Allocated memory was 144.2 MB in the beginning and 201.9 MB in the end (delta: 57.7 MB). Free memory was 91.0 MB in the beginning and 169.9 MB in the end (delta: -79.0 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-21 11:09:07,812 INFO L168 Benchmark]: TraceAbstraction took 1788.52 ms. Allocated memory is still 201.9 MB. Free memory was 169.9 MB in the beginning and 104.8 MB in the end (delta: 65.2 MB). Peak memory consumption was 65.2 MB. Max. memory is 7.1 GB. [2020-07-21 11:09:07,825 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 144.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 274.14 ms. Allocated memory is still 144.2 MB. Free memory was 101.6 MB in the beginning and 92.4 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 40.70 ms. Allocated memory is still 144.2 MB. Free memory was 92.4 MB in the beginning and 91.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 391.29 ms. Allocated memory was 144.2 MB in the beginning and 201.9 MB in the end (delta: 57.7 MB). Free memory was 91.0 MB in the beginning and 169.9 MB in the end (delta: -79.0 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1788.52 ms. Allocated memory is still 201.9 MB. Free memory was 169.9 MB in the beginning and 104.8 MB in the end (delta: 65.2 MB). Peak memory consumption was 65.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] unsigned int input = __VERIFIER_nondet_uint(); [L11] CALL, EXPR id(input) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] return 0; VAL [\old(x)=0, \result=0, x=0] [L6] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) VAL [id(input)=3, input=3] [L11] unsigned int result = id(input); [L12] COND TRUE result == 3 VAL [input=3, result=3] [L13] __VERIFIER_error() VAL [input=3, result=3] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.6s, OverallIterations: 3, TraceHistogramMax: 4, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 36 SDtfs, 2 SDslu, 164 SDs, 0 SdLazy, 32 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 49 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=2, 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, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 63 NumberOfCodeBlocks, 63 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 48 ConstructedInterpolants, 0 QuantifiedInterpolants, 1752 SizeOfPredicates, 2 NumberOfNonLiveVariables, 72 ConjunctsInSsa, 18 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 4/8 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...