./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/afterrec-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/afterrec-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 e8f83f4c04fbac90273b8f8e733ac05d1463068f ......................................................................................................................................................................................................................................................................................................................................... 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 17:28:29,245 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-28 17:28:29,248 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-28 17:28:29,269 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-28 17:28:29,269 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-28 17:28:29,271 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-28 17:28:29,273 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-28 17:28:29,283 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-28 17:28:29,288 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-28 17:28:29,292 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-28 17:28:29,294 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-28 17:28:29,296 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-28 17:28:29,296 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-28 17:28:29,299 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-28 17:28:29,300 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-28 17:28:29,302 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-28 17:28:29,303 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-28 17:28:29,304 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-28 17:28:29,307 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-28 17:28:29,311 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-28 17:28:29,316 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-28 17:28:29,320 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-28 17:28:29,322 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-28 17:28:29,324 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-28 17:28:29,326 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-28 17:28:29,327 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-28 17:28:29,327 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-28 17:28:29,329 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-28 17:28:29,329 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-28 17:28:29,330 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-28 17:28:29,331 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-28 17:28:29,332 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-28 17:28:29,332 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-28 17:28:29,334 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-28 17:28:29,335 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-28 17:28:29,336 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-28 17:28:29,337 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-28 17:28:29,337 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-28 17:28:29,338 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-28 17:28:29,339 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-28 17:28:29,341 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-28 17:28:29,342 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-28 17:28:29,376 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-28 17:28:29,377 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-28 17:28:29,378 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-28 17:28:29,380 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-28 17:28:29,382 INFO L138 SettingsManager]: * Use SBE=true [2019-11-28 17:28:29,383 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-28 17:28:29,383 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-28 17:28:29,383 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-28 17:28:29,384 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-28 17:28:29,384 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-28 17:28:29,384 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-28 17:28:29,384 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-28 17:28:29,385 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-28 17:28:29,385 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-28 17:28:29,386 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-28 17:28:29,387 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-28 17:28:29,387 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-28 17:28:29,387 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-28 17:28:29,387 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-28 17:28:29,388 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-28 17:28:29,388 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-28 17:28:29,388 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-28 17:28:29,389 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-28 17:28:29,389 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-28 17:28:29,390 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-28 17:28:29,390 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-28 17:28:29,390 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-28 17:28:29,390 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-28 17:28:29,391 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-11-28 17:28:29,391 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 -> e8f83f4c04fbac90273b8f8e733ac05d1463068f [2019-11-28 17:28:29,730 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-28 17:28:29,749 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-28 17:28:29,753 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-28 17:28:29,754 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-28 17:28:29,755 INFO L275 PluginConnector]: CDTParser initialized [2019-11-28 17:28:29,756 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/afterrec-1.c [2019-11-28 17:28:29,823 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72bcf3aa4/7e745d890455496eb6d772d01f796f06/FLAGa83276cf4 [2019-11-28 17:28:30,261 INFO L306 CDTParser]: Found 1 translation units. [2019-11-28 17:28:30,262 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/afterrec-1.c [2019-11-28 17:28:30,268 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72bcf3aa4/7e745d890455496eb6d772d01f796f06/FLAGa83276cf4 [2019-11-28 17:28:30,627 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72bcf3aa4/7e745d890455496eb6d772d01f796f06 [2019-11-28 17:28:30,631 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-28 17:28:30,633 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-28 17:28:30,635 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-28 17:28:30,635 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-28 17:28:30,640 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-28 17:28:30,641 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 05:28:30" (1/1) ... [2019-11-28 17:28:30,644 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@560d1413 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:30, skipping insertion in model container [2019-11-28 17:28:30,644 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 05:28:30" (1/1) ... [2019-11-28 17:28:30,655 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-28 17:28:30,674 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-28 17:28:30,882 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-28 17:28:30,890 INFO L203 MainTranslator]: Completed pre-run [2019-11-28 17:28:30,907 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-28 17:28:30,925 INFO L208 MainTranslator]: Completed translation [2019-11-28 17:28:30,925 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:30 WrapperNode [2019-11-28 17:28:30,926 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-28 17:28:30,927 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-28 17:28:30,927 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-28 17:28:30,928 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-28 17:28:30,938 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:30" (1/1) ... [2019-11-28 17:28:30,946 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:30" (1/1) ... [2019-11-28 17:28:30,969 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-28 17:28:30,970 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-28 17:28:30,970 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-28 17:28:30,971 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-28 17:28:31,041 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:30" (1/1) ... [2019-11-28 17:28:31,042 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:30" (1/1) ... [2019-11-28 17:28:31,042 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:30" (1/1) ... [2019-11-28 17:28:31,042 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:30" (1/1) ... [2019-11-28 17:28:31,045 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:30" (1/1) ... [2019-11-28 17:28:31,047 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:30" (1/1) ... [2019-11-28 17:28:31,048 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:30" (1/1) ... [2019-11-28 17:28:31,049 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-28 17:28:31,050 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-28 17:28:31,050 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-28 17:28:31,050 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-28 17:28:31,052 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:30" (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 17:28:31,123 INFO L130 BoogieDeclarations]: Found specification of procedure f [2019-11-28 17:28:31,124 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2019-11-28 17:28:31,124 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-28 17:28:31,125 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-28 17:28:31,283 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-28 17:28:31,283 INFO L287 CfgBuilder]: Removed 4 assume(true) statements. [2019-11-28 17:28:31,284 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 05:28:31 BoogieIcfgContainer [2019-11-28 17:28:31,285 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-28 17:28:31,286 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-28 17:28:31,286 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-28 17:28:31,289 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-28 17:28:31,290 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 05:28:30" (1/3) ... [2019-11-28 17:28:31,291 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4586578a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 05:28:31, skipping insertion in model container [2019-11-28 17:28:31,291 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:30" (2/3) ... [2019-11-28 17:28:31,292 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4586578a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 05:28:31, skipping insertion in model container [2019-11-28 17:28:31,292 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 05:28:31" (3/3) ... [2019-11-28 17:28:31,294 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec-1.c [2019-11-28 17:28:31,303 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-28 17:28:31,309 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-28 17:28:31,323 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-28 17:28:31,355 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-28 17:28:31,355 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-28 17:28:31,356 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-28 17:28:31,358 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-28 17:28:31,358 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-28 17:28:31,359 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-28 17:28:31,359 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-28 17:28:31,359 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-28 17:28:31,376 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2019-11-28 17:28:31,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-28 17:28:31,381 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:28:31,382 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:28:31,382 INFO L410 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:28:31,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:28:31,388 INFO L82 PathProgramCache]: Analyzing trace with hash 1875137816, now seen corresponding path program 1 times [2019-11-28 17:28:31,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:28:31,395 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615023458] [2019-11-28 17:28:31,396 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:28:31,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:28:31,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:28:31,776 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-28 17:28:31,777 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615023458] [2019-11-28 17:28:31,778 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [850237042] [2019-11-28 17:28:31,779 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 17:28:31,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:28:31,808 INFO L264 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-28 17:28:31,814 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 17:28:31,869 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-28 17:28:31,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 17:28:31,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2019-11-28 17:28:31,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240198324] [2019-11-28 17:28:31,878 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-28 17:28:31,879 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:28:31,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-28 17:28:31,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-11-28 17:28:31,892 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 8 states. [2019-11-28 17:28:32,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:28:32,015 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2019-11-28 17:28:32,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-28 17:28:32,018 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2019-11-28 17:28:32,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:28:32,028 INFO L225 Difference]: With dead ends: 19 [2019-11-28 17:28:32,029 INFO L226 Difference]: Without dead ends: 12 [2019-11-28 17:28:32,035 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2019-11-28 17:28:32,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-11-28 17:28:32,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-11-28 17:28:32,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-11-28 17:28:32,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-11-28 17:28:32,076 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-11-28 17:28:32,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:28:32,076 INFO L462 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-11-28 17:28:32,077 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-28 17:28:32,077 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-11-28 17:28:32,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-28 17:28:32,078 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:28:32,078 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2019-11-28 17:28:32,283 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:28:32,284 INFO L410 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:28:32,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:28:32,285 INFO L82 PathProgramCache]: Analyzing trace with hash -1932067944, now seen corresponding path program 2 times [2019-11-28 17:28:32,286 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:28:32,287 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [101742920] [2019-11-28 17:28:32,287 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:28:32,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:28:32,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:28:32,382 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-28 17:28:32,388 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [101742920] [2019-11-28 17:28:32,389 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [955549547] [2019-11-28 17:28:32,389 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:28:32,433 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-28 17:28:32,434 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-28 17:28:32,435 INFO L264 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-28 17:28:32,438 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 17:28:32,463 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-28 17:28:32,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-28 17:28:32,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 8 [2019-11-28 17:28:32,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961193858] [2019-11-28 17:28:32,466 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-28 17:28:32,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:28:32,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-28 17:28:32,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-11-28 17:28:32,469 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 8 states. [2019-11-28 17:28:32,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:28:32,581 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2019-11-28 17:28:32,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-28 17:28:32,581 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2019-11-28 17:28:32,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:28:32,582 INFO L225 Difference]: With dead ends: 23 [2019-11-28 17:28:32,582 INFO L226 Difference]: Without dead ends: 14 [2019-11-28 17:28:32,583 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2019-11-28 17:28:32,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-28 17:28:32,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-11-28 17:28:32,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-28 17:28:32,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 13 transitions. [2019-11-28 17:28:32,589 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 13 transitions. Word has length 16 [2019-11-28 17:28:32,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:28:32,589 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 13 transitions. [2019-11-28 17:28:32,589 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-28 17:28:32,590 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 13 transitions. [2019-11-28 17:28:32,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-28 17:28:32,591 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:28:32,591 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2019-11-28 17:28:32,794 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:28:32,795 INFO L410 AbstractCegarLoop]: === Iteration 3 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:28:32,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:28:32,795 INFO L82 PathProgramCache]: Analyzing trace with hash -1336844716, now seen corresponding path program 3 times [2019-11-28 17:28:32,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:28:32,796 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [85863774] [2019-11-28 17:28:32,796 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:28:32,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-28 17:28:32,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-28 17:28:32,836 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-11-28 17:28:32,836 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-28 17:28:32,859 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 05:28:32 BoogieIcfgContainer [2019-11-28 17:28:32,859 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-28 17:28:32,860 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-28 17:28:32,860 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-28 17:28:32,860 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-28 17:28:32,861 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 05:28:31" (3/4) ... [2019-11-28 17:28:32,866 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-28 17:28:32,911 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2019-11-28 17:28:32,912 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-28 17:28:32,914 INFO L168 Benchmark]: Toolchain (without parser) took 2280.41 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 149.4 MB). Free memory was 955.0 MB in the beginning and 1.1 GB in the end (delta: -101.9 MB). Peak memory consumption was 47.6 MB. Max. memory is 11.5 GB. [2019-11-28 17:28:32,915 INFO L168 Benchmark]: CDTParser took 0.72 ms. Allocated memory is still 1.0 GB. Free memory is still 981.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-28 17:28:32,916 INFO L168 Benchmark]: CACSL2BoogieTranslator took 291.57 ms. Allocated memory is still 1.0 GB. Free memory was 955.0 MB in the beginning and 944.3 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2019-11-28 17:28:32,916 INFO L168 Benchmark]: Boogie Procedure Inliner took 43.10 ms. Allocated memory is still 1.0 GB. Free memory is still 944.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-28 17:28:32,917 INFO L168 Benchmark]: Boogie Preprocessor took 79.60 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 149.4 MB). Free memory was 944.3 MB in the beginning and 1.1 GB in the end (delta: -201.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 11.5 GB. [2019-11-28 17:28:32,918 INFO L168 Benchmark]: RCFGBuilder took 234.84 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: 19.4 MB). Peak memory consumption was 19.4 MB. Max. memory is 11.5 GB. [2019-11-28 17:28:32,919 INFO L168 Benchmark]: TraceAbstraction took 1573.47 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: 69.8 MB). Peak memory consumption was 69.8 MB. Max. memory is 11.5 GB. [2019-11-28 17:28:32,919 INFO L168 Benchmark]: Witness Printer took 52.23 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-28 17:28:32,923 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.72 ms. Allocated memory is still 1.0 GB. Free memory is still 981.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 291.57 ms. Allocated memory is still 1.0 GB. Free memory was 955.0 MB in the beginning and 944.3 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 43.10 ms. Allocated memory is still 1.0 GB. Free memory is still 944.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 79.60 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 149.4 MB). Free memory was 944.3 MB in the beginning and 1.1 GB in the end (delta: -201.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 234.84 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: 19.4 MB). Peak memory consumption was 19.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 1573.47 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: 69.8 MB). Peak memory consumption was 69.8 MB. Max. memory is 11.5 GB. * Witness Printer took 52.23 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 7]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] CALL f(4) VAL [\old(n)=4] [L4] COND FALSE !(n<3) [L5] n-- VAL [\old(n)=4, n=3] [L6] CALL f(n) VAL [\old(n)=3] [L4] COND FALSE !(n<3) [L5] n-- VAL [\old(n)=3, n=2] [L6] CALL f(n) VAL [\old(n)=2] [L4] COND TRUE n<3 VAL [\old(n)=2, n=2] [L6] RET f(n) VAL [\old(n)=3, n=2] [L7] __VERIFIER_error() VAL [\old(n)=3, n=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 12 locations, 1 error locations. Result: UNSAFE, OverallTime: 1.4s, OverallIterations: 3, TraceHistogramMax: 4, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 12 SDtfs, 22 SDslu, 22 SDs, 0 SdLazy, 53 SolverSat, 13 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 52 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=14occurred 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, 65 NumberOfCodeBlocks, 65 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 48 ConstructedInterpolants, 0 QuantifiedInterpolants, 1308 SizeOfPredicates, 6 NumberOfNonLiveVariables, 62 ConjunctsInSsa, 15 ConjunctsInUnsatCore, 4 InterpolantComputations, 1 PerfectInterpolantSequences, 24/34 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...