./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/sum_2x3-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version f470102c Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/sum_2x3-1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 5417ea5971c5cfa3624e07fbe8bf33ef4632cb6f ...................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.25-f470102 [2019-11-28 17:30:20,079 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-28 17:30:20,081 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-28 17:30:20,094 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-28 17:30:20,095 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-28 17:30:20,096 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-28 17:30:20,097 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-28 17:30:20,099 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-28 17:30:20,101 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-28 17:30:20,102 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-28 17:30:20,103 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-28 17:30:20,104 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-28 17:30:20,105 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-28 17:30:20,106 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-28 17:30:20,107 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-28 17:30:20,108 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-28 17:30:20,111 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-28 17:30:20,115 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-28 17:30:20,117 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-28 17:30:20,118 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-28 17:30:20,120 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-28 17:30:20,121 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-28 17:30:20,122 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-28 17:30:20,123 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-28 17:30:20,126 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-28 17:30:20,126 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-28 17:30:20,126 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-28 17:30:20,127 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-28 17:30:20,128 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-28 17:30:20,129 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-28 17:30:20,129 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-28 17:30:20,130 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-28 17:30:20,131 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-28 17:30:20,131 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-28 17:30:20,132 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-28 17:30:20,133 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-28 17:30:20,133 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-28 17:30:20,134 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-28 17:30:20,134 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-28 17:30:20,135 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-28 17:30:20,136 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-28 17:30:20,137 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-28 17:30:20,151 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-28 17:30:20,151 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-28 17:30:20,153 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-28 17:30:20,153 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-28 17:30:20,153 INFO L138 SettingsManager]: * Use SBE=true [2019-11-28 17:30:20,153 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-28 17:30:20,154 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-28 17:30:20,154 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-28 17:30:20,154 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-28 17:30:20,155 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-28 17:30:20,155 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-28 17:30:20,155 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-28 17:30:20,155 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-28 17:30:20,158 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-28 17:30:20,158 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-28 17:30:20,158 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-28 17:30:20,158 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-28 17:30:20,159 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-28 17:30:20,159 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-28 17:30:20,159 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-28 17:30:20,160 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-28 17:30:20,160 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-28 17:30:20,160 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-28 17:30:20,161 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-28 17:30:20,161 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-28 17:30:20,161 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-28 17:30:20,161 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-28 17:30:20,161 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-28 17:30:20,162 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-11-28 17:30:20,162 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5417ea5971c5cfa3624e07fbe8bf33ef4632cb6f [2019-11-28 17:30:20,443 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-28 17:30:20,456 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-28 17:30:20,459 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-28 17:30:20,461 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-28 17:30:20,461 INFO L275 PluginConnector]: CDTParser initialized [2019-11-28 17:30:20,462 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/sum_2x3-1.c [2019-11-28 17:30:20,520 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bfe696698/f4bfeec94ae842ab868b00f8100baced/FLAGe246d7fd1 [2019-11-28 17:30:20,936 INFO L306 CDTParser]: Found 1 translation units. [2019-11-28 17:30:20,937 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/sum_2x3-1.c [2019-11-28 17:30:20,943 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bfe696698/f4bfeec94ae842ab868b00f8100baced/FLAGe246d7fd1 [2019-11-28 17:30:21,343 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bfe696698/f4bfeec94ae842ab868b00f8100baced [2019-11-28 17:30:21,346 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-28 17:30:21,348 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-28 17:30:21,349 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-28 17:30:21,349 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-28 17:30:21,354 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-28 17:30:21,354 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 05:30:21" (1/1) ... [2019-11-28 17:30:21,357 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1844f808 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:30:21, skipping insertion in model container [2019-11-28 17:30:21,357 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 05:30:21" (1/1) ... [2019-11-28 17:30:21,365 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-28 17:30:21,384 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-28 17:30:21,567 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-28 17:30:21,570 INFO L203 MainTranslator]: Completed pre-run [2019-11-28 17:30:21,582 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-28 17:30:21,593 INFO L208 MainTranslator]: Completed translation [2019-11-28 17:30:21,594 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:30:21 WrapperNode [2019-11-28 17:30:21,594 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-28 17:30:21,595 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-28 17:30:21,595 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-28 17:30:21,595 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-28 17:30:21,604 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:30:21" (1/1) ... [2019-11-28 17:30:21,609 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:30:21" (1/1) ... [2019-11-28 17:30:21,624 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-28 17:30:21,624 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-28 17:30:21,624 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-28 17:30:21,625 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-28 17:30:21,696 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:30:21" (1/1) ... [2019-11-28 17:30:21,696 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:30:21" (1/1) ... [2019-11-28 17:30:21,697 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:30:21" (1/1) ... [2019-11-28 17:30:21,697 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:30:21" (1/1) ... [2019-11-28 17:30:21,699 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:30:21" (1/1) ... [2019-11-28 17:30:21,700 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:30:21" (1/1) ... [2019-11-28 17:30:21,701 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:30:21" (1/1) ... [2019-11-28 17:30:21,701 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-28 17:30:21,702 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-28 17:30:21,702 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-28 17:30:21,702 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-28 17:30:21,703 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:30:21" (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 [2019-11-28 17:30:21,760 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-28 17:30:21,760 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-28 17:30:21,760 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2019-11-28 17:30:21,760 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2019-11-28 17:30:21,905 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-28 17:30:21,905 INFO L287 CfgBuilder]: Removed 4 assume(true) statements. [2019-11-28 17:30:21,907 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 05:30:21 BoogieIcfgContainer [2019-11-28 17:30:21,907 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-28 17:30:21,908 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-28 17:30:21,908 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-28 17:30:21,910 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-28 17:30:21,911 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 05:30:21" (1/3) ... [2019-11-28 17:30:21,911 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d262c91 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 05:30:21, skipping insertion in model container [2019-11-28 17:30:21,912 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:30:21" (2/3) ... [2019-11-28 17:30:21,912 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d262c91 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 05:30:21, skipping insertion in model container [2019-11-28 17:30:21,912 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 05:30:21" (3/3) ... [2019-11-28 17:30:21,914 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2019-11-28 17:30:21,923 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-28 17:30:21,929 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-28 17:30:21,941 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-28 17:30:21,965 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-28 17:30:21,965 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-28 17:30:21,965 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-28 17:30:21,965 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-28 17:30:21,966 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-28 17:30:21,966 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-28 17:30:21,966 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-28 17:30:21,966 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-28 17:30:21,983 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2019-11-28 17:30:21,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-28 17:30:21,989 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:30:21,990 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:30:21,990 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:30:21,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:30:21,996 INFO L82 PathProgramCache]: Analyzing trace with hash 389977641, now seen corresponding path program 1 times [2019-11-28 17:30:22,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:30:22,005 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [621502565] [2019-11-28 17:30:22,006 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:30:22,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:30:22,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:30:22,337 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-28 17:30:22,338 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [621502565] [2019-11-28 17:30:22,338 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-28 17:30:22,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-11-28 17:30:22,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526541953] [2019-11-28 17:30:22,344 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-28 17:30:22,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:30:22,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-28 17:30:22,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-11-28 17:30:22,357 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 7 states. [2019-11-28 17:30:22,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:30:22,490 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2019-11-28 17:30:22,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-28 17:30:22,492 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2019-11-28 17:30:22,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:30:22,502 INFO L225 Difference]: With dead ends: 24 [2019-11-28 17:30:22,503 INFO L226 Difference]: Without dead ends: 14 [2019-11-28 17:30:22,506 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-11-28 17:30:22,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-28 17:30:22,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-11-28 17:30:22,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-28 17:30:22,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-11-28 17:30:22,545 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2019-11-28 17:30:22,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:30:22,546 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-11-28 17:30:22,546 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-28 17:30:22,546 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-11-28 17:30:22,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-28 17:30:22,549 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:30:22,549 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:30:22,549 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:30:22,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:30:22,550 INFO L82 PathProgramCache]: Analyzing trace with hash -881029229, now seen corresponding path program 1 times [2019-11-28 17:30:22,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:30:22,551 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443416638] [2019-11-28 17:30:22,552 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:30:22,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:30:22,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:30:22,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:30:22,748 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-28 17:30:22,750 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443416638] [2019-11-28 17:30:22,750 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1447478176] [2019-11-28 17:30:22,750 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:30:22,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:30:22,791 INFO L264 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-28 17:30:22,800 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 17:30:22,859 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-28 17:30:22,860 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 17:30:22,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 9 [2019-11-28 17:30:22,861 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9492851] [2019-11-28 17:30:22,862 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-28 17:30:22,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:30:22,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-28 17:30:22,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2019-11-28 17:30:22,864 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 9 states. [2019-11-28 17:30:22,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:30:22,943 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2019-11-28 17:30:22,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-28 17:30:22,944 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2019-11-28 17:30:22,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:30:22,945 INFO L225 Difference]: With dead ends: 21 [2019-11-28 17:30:22,945 INFO L226 Difference]: Without dead ends: 17 [2019-11-28 17:30:22,946 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2019-11-28 17:30:22,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-28 17:30:22,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-11-28 17:30:22,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-28 17:30:22,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-11-28 17:30:22,952 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2019-11-28 17:30:22,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:30:22,953 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-11-28 17:30:22,953 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-28 17:30:22,953 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-11-28 17:30:22,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-28 17:30:22,954 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:30:22,955 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:30:23,157 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:30:23,158 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:30:23,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:30:23,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1824240471, now seen corresponding path program 2 times [2019-11-28 17:30:23,160 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:30:23,160 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1258453423] [2019-11-28 17:30:23,160 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:30:23,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-28 17:30:23,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-28 17:30:23,236 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-11-28 17:30:23,236 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-28 17:30:23,262 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 05:30:23 BoogieIcfgContainer [2019-11-28 17:30:23,263 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-28 17:30:23,263 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-28 17:30:23,263 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-28 17:30:23,264 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-28 17:30:23,264 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 05:30:21" (3/4) ... [2019-11-28 17:30:23,267 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-28 17:30:23,311 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2019-11-28 17:30:23,311 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-28 17:30:23,314 INFO L168 Benchmark]: Toolchain (without parser) took 1965.52 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 154.7 MB). Free memory was 960.4 MB in the beginning and 1.1 GB in the end (delta: -99.8 MB). Peak memory consumption was 54.9 MB. Max. memory is 11.5 GB. [2019-11-28 17:30:23,315 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 1.0 GB. Free memory is still 987.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-28 17:30:23,316 INFO L168 Benchmark]: CACSL2BoogieTranslator took 245.52 ms. Allocated memory is still 1.0 GB. Free memory was 960.4 MB in the beginning and 949.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2019-11-28 17:30:23,317 INFO L168 Benchmark]: Boogie Procedure Inliner took 29.00 ms. Allocated memory is still 1.0 GB. Free memory is still 949.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-28 17:30:23,318 INFO L168 Benchmark]: Boogie Preprocessor took 77.41 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 154.7 MB). Free memory was 949.6 MB in the beginning and 1.2 GB in the end (delta: -201.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 11.5 GB. [2019-11-28 17:30:23,319 INFO L168 Benchmark]: RCFGBuilder took 204.98 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 18.2 MB). Peak memory consumption was 18.2 MB. Max. memory is 11.5 GB. [2019-11-28 17:30:23,319 INFO L168 Benchmark]: TraceAbstraction took 1355.30 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 66.6 MB). Peak memory consumption was 66.6 MB. Max. memory is 11.5 GB. [2019-11-28 17:30:23,320 INFO L168 Benchmark]: Witness Printer took 48.04 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 6.5 MB). Peak memory consumption was 6.5 MB. Max. memory is 11.5 GB. [2019-11-28 17:30:23,325 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 1.0 GB. Free memory is still 987.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 245.52 ms. Allocated memory is still 1.0 GB. Free memory was 960.4 MB in the beginning and 949.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 29.00 ms. Allocated memory is still 1.0 GB. Free memory is still 949.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 77.41 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 154.7 MB). Free memory was 949.6 MB in the beginning and 1.2 GB in the end (delta: -201.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 11.5 GB. * RCFGBuilder took 204.98 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 18.2 MB). Peak memory consumption was 18.2 MB. Max. memory is 11.5 GB. * TraceAbstraction took 1355.30 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 66.6 MB). Peak memory consumption was 66.6 MB. Max. memory is 11.5 GB. * Witness Printer took 48.04 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 6.5 MB). Peak memory consumption was 6.5 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 2; [L13] int b = 3; [L14] CALL, EXPR sum(a, b) VAL [\old(m)=3, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=2, m=3, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=1, m=4, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=0] [L4] COND TRUE n <= 0 [L5] return m + n; VAL [\old(m)=5, \old(n)=0, \result=5, m=5, n=0] [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1, m=4, n=1, sum(n - 1, m + 1)=5] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=2, m=3, n=2, sum(n - 1, m + 1)=5] [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) [L14] int result = sum(a, b); [L15] COND TRUE result == a + b [L16] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 15 locations, 1 error locations. Result: UNSAFE, OverallTime: 1.2s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 18 SDtfs, 20 SDslu, 60 SDs, 0 SdLazy, 88 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred 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, 60 NumberOfCodeBlocks, 60 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 36 ConstructedInterpolants, 0 QuantifiedInterpolants, 1288 SizeOfPredicates, 3 NumberOfNonLiveVariables, 47 ConjunctsInSsa, 6 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, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...