./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loops/nec20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9a8b2e8d Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -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/loops/nec20.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(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash b24dfa0dd4504b10530e4ddbc9574e106897fa2d ............................................................................................................................................................................................................................................................................................................................. 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 0.1.25-9a8b2e8 [2020-10-20 00:55:19,819 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-20 00:55:19,822 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-20 00:55:19,849 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-20 00:55:19,850 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-20 00:55:19,851 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-20 00:55:19,852 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-20 00:55:19,854 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-20 00:55:19,856 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-20 00:55:19,857 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-20 00:55:19,858 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-20 00:55:19,859 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-20 00:55:19,859 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-20 00:55:19,860 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-20 00:55:19,861 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-20 00:55:19,863 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-20 00:55:19,864 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-20 00:55:19,865 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-20 00:55:19,866 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-20 00:55:19,868 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-20 00:55:19,869 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-20 00:55:19,876 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-20 00:55:19,877 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-20 00:55:19,878 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-20 00:55:19,881 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-20 00:55:19,881 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-20 00:55:19,882 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-20 00:55:19,883 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-20 00:55:19,883 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-20 00:55:19,884 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-20 00:55:19,884 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-20 00:55:19,885 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-20 00:55:19,886 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-20 00:55:19,887 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-20 00:55:19,888 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-20 00:55:19,888 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-20 00:55:19,889 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-20 00:55:19,889 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-20 00:55:19,889 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-20 00:55:19,890 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-20 00:55:19,891 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-20 00:55:19,892 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-20 00:55:19,915 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-20 00:55:19,915 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-20 00:55:19,916 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-20 00:55:19,917 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-20 00:55:19,917 INFO L138 SettingsManager]: * Use SBE=true [2020-10-20 00:55:19,917 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-20 00:55:19,917 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-20 00:55:19,918 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-20 00:55:19,918 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-20 00:55:19,918 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-20 00:55:19,919 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-20 00:55:19,919 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-20 00:55:19,919 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-20 00:55:19,919 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-20 00:55:19,919 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-20 00:55:19,920 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-20 00:55:19,920 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-20 00:55:19,920 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-20 00:55:19,921 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-20 00:55:19,921 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-20 00:55:19,921 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-20 00:55:19,921 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-20 00:55:19,922 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-20 00:55:19,922 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-20 00:55:19,922 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-20 00:55:19,922 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-20 00:55:19,922 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-20 00:55:19,923 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-20 00:55:19,923 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-20 00:55:19,923 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(reach_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 -> b24dfa0dd4504b10530e4ddbc9574e106897fa2d [2020-10-20 00:55:20,166 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-20 00:55:20,184 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-20 00:55:20,190 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-20 00:55:20,191 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-20 00:55:20,193 INFO L275 PluginConnector]: CDTParser initialized [2020-10-20 00:55:20,194 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops/nec20.c [2020-10-20 00:55:20,271 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b6c629fe7/6ecb5331dd91445b9157a08501709f91/FLAG781cefbfc [2020-10-20 00:55:20,761 INFO L306 CDTParser]: Found 1 translation units. [2020-10-20 00:55:20,761 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops/nec20.c [2020-10-20 00:55:20,768 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b6c629fe7/6ecb5331dd91445b9157a08501709f91/FLAG781cefbfc [2020-10-20 00:55:21,150 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b6c629fe7/6ecb5331dd91445b9157a08501709f91 [2020-10-20 00:55:21,153 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-20 00:55:21,160 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-20 00:55:21,161 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-20 00:55:21,161 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-20 00:55:21,165 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-20 00:55:21,166 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 12:55:21" (1/1) ... [2020-10-20 00:55:21,169 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43d0a8f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:21, skipping insertion in model container [2020-10-20 00:55:21,169 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 12:55:21" (1/1) ... [2020-10-20 00:55:21,176 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-20 00:55:21,194 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-20 00:55:21,455 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 00:55:21,465 INFO L203 MainTranslator]: Completed pre-run [2020-10-20 00:55:21,503 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 00:55:21,523 INFO L208 MainTranslator]: Completed translation [2020-10-20 00:55:21,524 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:21 WrapperNode [2020-10-20 00:55:21,524 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-20 00:55:21,525 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-20 00:55:21,526 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-20 00:55:21,526 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-20 00:55:21,535 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:21" (1/1) ... [2020-10-20 00:55:21,547 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:21" (1/1) ... [2020-10-20 00:55:21,578 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-20 00:55:21,579 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-20 00:55:21,579 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-20 00:55:21,580 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-20 00:55:21,591 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:21" (1/1) ... [2020-10-20 00:55:21,592 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:21" (1/1) ... [2020-10-20 00:55:21,607 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:21" (1/1) ... [2020-10-20 00:55:21,609 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:21" (1/1) ... [2020-10-20 00:55:21,615 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:21" (1/1) ... [2020-10-20 00:55:21,628 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:21" (1/1) ... [2020-10-20 00:55:21,631 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:21" (1/1) ... [2020-10-20 00:55:21,633 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-20 00:55:21,634 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-20 00:55:21,634 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-20 00:55:21,635 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-20 00:55:21,635 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:21" (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 [2020-10-20 00:55:21,728 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-20 00:55:21,728 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-20 00:55:21,728 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-20 00:55:21,729 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-20 00:55:22,106 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-20 00:55:22,106 INFO L298 CfgBuilder]: Removed 9 assume(true) statements. [2020-10-20 00:55:22,108 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 12:55:22 BoogieIcfgContainer [2020-10-20 00:55:22,108 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-20 00:55:22,110 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-20 00:55:22,110 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-20 00:55:22,113 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-20 00:55:22,114 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.10 12:55:21" (1/3) ... [2020-10-20 00:55:22,114 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@640a6db6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 12:55:22, skipping insertion in model container [2020-10-20 00:55:22,115 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:21" (2/3) ... [2020-10-20 00:55:22,115 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@640a6db6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 12:55:22, skipping insertion in model container [2020-10-20 00:55:22,115 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 12:55:22" (3/3) ... [2020-10-20 00:55:22,117 INFO L111 eAbstractionObserver]: Analyzing ICFG nec20.c [2020-10-20 00:55:22,129 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-20 00:55:22,136 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-20 00:55:22,150 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-20 00:55:22,170 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-20 00:55:22,170 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-20 00:55:22,171 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-20 00:55:22,171 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-20 00:55:22,171 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-20 00:55:22,171 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-20 00:55:22,172 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-20 00:55:22,172 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-20 00:55:22,185 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-10-20 00:55:22,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-10-20 00:55:22,191 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:55:22,192 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:55:22,192 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:55:22,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:55:22,197 INFO L82 PathProgramCache]: Analyzing trace with hash -592064849, now seen corresponding path program 1 times [2020-10-20 00:55:22,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:55:22,208 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487220869] [2020-10-20 00:55:22,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:55:22,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:55:22,425 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:55:22,426 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487220869] [2020-10-20 00:55:22,427 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 00:55:22,428 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-20 00:55:22,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867447371] [2020-10-20 00:55:22,434 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-20 00:55:22,434 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:55:22,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-20 00:55:22,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-20 00:55:22,451 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 4 states. [2020-10-20 00:55:22,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:55:22,504 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2020-10-20 00:55:22,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-20 00:55:22,506 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-10-20 00:55:22,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:55:22,515 INFO L225 Difference]: With dead ends: 44 [2020-10-20 00:55:22,516 INFO L226 Difference]: Without dead ends: 18 [2020-10-20 00:55:22,519 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-20 00:55:22,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-10-20 00:55:22,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2020-10-20 00:55:22,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-10-20 00:55:22,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-10-20 00:55:22,559 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2020-10-20 00:55:22,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:55:22,559 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-10-20 00:55:22,559 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-20 00:55:22,559 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-10-20 00:55:22,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-10-20 00:55:22,560 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:55:22,560 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:55:22,560 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-20 00:55:22,561 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:55:22,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:55:22,561 INFO L82 PathProgramCache]: Analyzing trace with hash 1182942513, now seen corresponding path program 1 times [2020-10-20 00:55:22,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:55:22,562 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857247149] [2020-10-20 00:55:22,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:55:22,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:55:22,708 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:55:22,708 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857247149] [2020-10-20 00:55:22,709 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 00:55:22,709 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-20 00:55:22,709 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164175957] [2020-10-20 00:55:22,711 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-20 00:55:22,711 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:55:22,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-20 00:55:22,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-20 00:55:22,712 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 4 states. [2020-10-20 00:55:22,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:55:22,765 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-10-20 00:55:22,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-20 00:55:22,766 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-10-20 00:55:22,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:55:22,767 INFO L225 Difference]: With dead ends: 23 [2020-10-20 00:55:22,767 INFO L226 Difference]: Without dead ends: 19 [2020-10-20 00:55:22,768 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-20 00:55:22,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-10-20 00:55:22,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 11. [2020-10-20 00:55:22,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-10-20 00:55:22,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-10-20 00:55:22,772 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 9 [2020-10-20 00:55:22,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:55:22,773 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-10-20 00:55:22,773 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-20 00:55:22,773 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-10-20 00:55:22,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-10-20 00:55:22,774 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:55:22,774 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:55:22,775 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-20 00:55:22,775 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:55:22,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:55:22,775 INFO L82 PathProgramCache]: Analyzing trace with hash -1172475752, now seen corresponding path program 1 times [2020-10-20 00:55:22,776 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:55:22,776 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628206779] [2020-10-20 00:55:22,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:55:22,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 00:55:22,816 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 00:55:22,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 00:55:22,865 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 00:55:22,908 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 00:55:22,909 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-20 00:55:22,910 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-20 00:55:22,968 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.10 12:55:22 BoogieIcfgContainer [2020-10-20 00:55:22,968 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-20 00:55:22,969 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-20 00:55:22,969 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-20 00:55:22,969 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-20 00:55:22,970 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 12:55:22" (3/4) ... [2020-10-20 00:55:22,975 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-10-20 00:55:23,028 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-10-20 00:55:23,028 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-20 00:55:23,031 INFO L168 Benchmark]: Toolchain (without parser) took 1875.24 ms. Allocated memory was 40.9 MB in the beginning and 45.1 MB in the end (delta: 4.2 MB). Free memory was 19.8 MB in the beginning and 21.1 MB in the end (delta: -1.3 MB). Peak memory consumption was 2.9 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:23,032 INFO L168 Benchmark]: CDTParser took 0.68 ms. Allocated memory is still 30.9 MB. Free memory was 7.3 MB in the beginning and 7.3 MB in the end (delta: 43.6 kB). Peak memory consumption was 43.6 kB. Max. memory is 14.3 GB. [2020-10-20 00:55:23,033 INFO L168 Benchmark]: CACSL2BoogieTranslator took 363.18 ms. Allocated memory was 40.9 MB in the beginning and 41.4 MB in the end (delta: 524.3 kB). Free memory was 18.9 MB in the beginning and 19.3 MB in the end (delta: -395.1 kB). Peak memory consumption was 9.1 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:23,034 INFO L168 Benchmark]: Boogie Procedure Inliner took 53.33 ms. Allocated memory is still 41.4 MB. Free memory was 19.2 MB in the beginning and 17.6 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:23,035 INFO L168 Benchmark]: Boogie Preprocessor took 54.74 ms. Allocated memory is still 41.4 MB. Free memory was 17.6 MB in the beginning and 16.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:23,036 INFO L168 Benchmark]: RCFGBuilder took 474.43 ms. Allocated memory was 41.4 MB in the beginning and 42.5 MB in the end (delta: 1.0 MB). Free memory was 16.2 MB in the beginning and 17.9 MB in the end (delta: -1.7 MB). Peak memory consumption was 6.1 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:23,037 INFO L168 Benchmark]: TraceAbstraction took 858.75 ms. Allocated memory was 42.5 MB in the beginning and 45.1 MB in the end (delta: 2.6 MB). Free memory was 17.5 MB in the beginning and 23.6 MB in the end (delta: -6.1 MB). There was no memory consumed. Max. memory is 14.3 GB. [2020-10-20 00:55:23,038 INFO L168 Benchmark]: Witness Printer took 59.54 ms. Allocated memory is still 45.1 MB. Free memory was 23.6 MB in the beginning and 21.1 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.5 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:23,042 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.68 ms. Allocated memory is still 30.9 MB. Free memory was 7.3 MB in the beginning and 7.3 MB in the end (delta: 43.6 kB). Peak memory consumption was 43.6 kB. Max. memory is 14.3 GB. * CACSL2BoogieTranslator took 363.18 ms. Allocated memory was 40.9 MB in the beginning and 41.4 MB in the end (delta: 524.3 kB). Free memory was 18.9 MB in the beginning and 19.3 MB in the end (delta: -395.1 kB). Peak memory consumption was 9.1 MB. Max. memory is 14.3 GB. * Boogie Procedure Inliner took 53.33 ms. Allocated memory is still 41.4 MB. Free memory was 19.2 MB in the beginning and 17.6 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 14.3 GB. * Boogie Preprocessor took 54.74 ms. Allocated memory is still 41.4 MB. Free memory was 17.6 MB in the beginning and 16.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 14.3 GB. * RCFGBuilder took 474.43 ms. Allocated memory was 41.4 MB in the beginning and 42.5 MB in the end (delta: 1.0 MB). Free memory was 16.2 MB in the beginning and 17.9 MB in the end (delta: -1.7 MB). Peak memory consumption was 6.1 MB. Max. memory is 14.3 GB. * TraceAbstraction took 858.75 ms. Allocated memory was 42.5 MB in the beginning and 45.1 MB in the end (delta: 2.6 MB). Free memory was 17.5 MB in the beginning and 23.6 MB in the end (delta: -6.1 MB). There was no memory consumed. Max. memory is 14.3 GB. * Witness Printer took 59.54 ms. Allocated memory is still 45.1 MB. Free memory was 23.6 MB in the beginning and 21.1 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.5 MB. Max. memory is 14.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int b; VAL [b=0] [L15] _Bool k=__VERIFIER_nondet_bool(); [L16] unsigned int i,n,j; [L17] int a[1025]; VAL [b=0] [L19] COND TRUE \read(k) [L20] n=0 VAL [b=0] [L25] i=0 [L26] j=__VERIFIER_nondet_uint() [L27] COND FALSE !(j > 10000) VAL [b=0] [L30] COND TRUE i <= n [L31] i++ [L32] j= j +2 VAL [b=0] [L30] COND FALSE !(i <= n) VAL [b=0] [L35] a[i]=0 [L7] COND TRUE !(cond) VAL [b=0] [L3] __assert_fail("0", "nec20.c", 3, "reach_error") VAL [b=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.7s, OverallIterations: 3, TraceHistogramMax: 1, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 42 SDtfs, 27 SDslu, 35 SDs, 0 SdLazy, 26 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 13 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 28 NumberOfCodeBlocks, 28 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 16 ConstructedInterpolants, 0 QuantifiedInterpolants, 528 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...