./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-properties/alternating_list-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version f470102c Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/list-properties/alternating_list-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/bin/uautomizer --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 9c54128245d3ab9ad313da188c7be33f66027c6a ............................................................................................................................................................................................................................................................................................................................ 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 [2019-12-07 18:43:40,549 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-12-07 18:43:40,550 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-12-07 18:43:40,558 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-12-07 18:43:40,558 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-12-07 18:43:40,559 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-12-07 18:43:40,559 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-12-07 18:43:40,561 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-12-07 18:43:40,562 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-12-07 18:43:40,563 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-12-07 18:43:40,563 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-12-07 18:43:40,564 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-12-07 18:43:40,564 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-12-07 18:43:40,565 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-12-07 18:43:40,565 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-12-07 18:43:40,566 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-12-07 18:43:40,567 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-12-07 18:43:40,567 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-12-07 18:43:40,569 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-12-07 18:43:40,571 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-12-07 18:43:40,572 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-12-07 18:43:40,572 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-12-07 18:43:40,573 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-12-07 18:43:40,573 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-12-07 18:43:40,575 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-12-07 18:43:40,575 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-12-07 18:43:40,576 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-12-07 18:43:40,576 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-12-07 18:43:40,576 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-12-07 18:43:40,577 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-12-07 18:43:40,577 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-12-07 18:43:40,577 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-12-07 18:43:40,578 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-12-07 18:43:40,578 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-12-07 18:43:40,579 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-12-07 18:43:40,579 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-12-07 18:43:40,579 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-12-07 18:43:40,579 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-12-07 18:43:40,580 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-12-07 18:43:40,580 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-12-07 18:43:40,581 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-12-07 18:43:40,581 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-12-07 18:43:40,590 INFO L113 SettingsManager]: Loading preferences was successful [2019-12-07 18:43:40,590 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-12-07 18:43:40,591 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-12-07 18:43:40,591 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-12-07 18:43:40,591 INFO L138 SettingsManager]: * Use SBE=true [2019-12-07 18:43:40,591 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-12-07 18:43:40,591 INFO L138 SettingsManager]: * sizeof long=4 [2019-12-07 18:43:40,592 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-12-07 18:43:40,592 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-12-07 18:43:40,592 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-12-07 18:43:40,592 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-12-07 18:43:40,592 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-12-07 18:43:40,592 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-12-07 18:43:40,592 INFO L138 SettingsManager]: * sizeof long double=12 [2019-12-07 18:43:40,592 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-12-07 18:43:40,592 INFO L138 SettingsManager]: * Use constant arrays=true [2019-12-07 18:43:40,592 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-12-07 18:43:40,593 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-12-07 18:43:40,593 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-12-07 18:43:40,593 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-12-07 18:43:40,593 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-12-07 18:43:40,593 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-12-07 18:43:40,593 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-12-07 18:43:40,593 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-12-07 18:43:40,593 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-12-07 18:43:40,594 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-12-07 18:43:40,594 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-12-07 18:43:40,594 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-12-07 18:43:40,594 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-12-07 18:43:40,594 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 -> /tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/bin/uautomizer 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 -> 9c54128245d3ab9ad313da188c7be33f66027c6a [2019-12-07 18:43:40,695 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-07 18:43:40,704 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-07 18:43:40,706 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-07 18:43:40,707 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-07 18:43:40,707 INFO L275 PluginConnector]: CDTParser initialized [2019-12-07 18:43:40,708 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/bin/uautomizer/../../sv-benchmarks/c/list-properties/alternating_list-2.i [2019-12-07 18:43:40,749 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/bin/uautomizer/data/46908b224/92614367f3194fb8955cc02c85ac30ea/FLAG4aaf36c11 [2019-12-07 18:43:41,258 INFO L306 CDTParser]: Found 1 translation units. [2019-12-07 18:43:41,258 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/sv-benchmarks/c/list-properties/alternating_list-2.i [2019-12-07 18:43:41,268 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/bin/uautomizer/data/46908b224/92614367f3194fb8955cc02c85ac30ea/FLAG4aaf36c11 [2019-12-07 18:43:41,780 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/bin/uautomizer/data/46908b224/92614367f3194fb8955cc02c85ac30ea [2019-12-07 18:43:41,783 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-07 18:43:41,784 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-12-07 18:43:41,785 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-07 18:43:41,785 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-07 18:43:41,788 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-07 18:43:41,788 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 06:43:41" (1/1) ... [2019-12-07 18:43:41,790 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c131985 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 06:43:41, skipping insertion in model container [2019-12-07 18:43:41,790 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 06:43:41" (1/1) ... [2019-12-07 18:43:41,796 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-07 18:43:41,822 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-07 18:43:42,051 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 18:43:42,059 INFO L203 MainTranslator]: Completed pre-run [2019-12-07 18:43:42,097 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 18:43:42,138 INFO L208 MainTranslator]: Completed translation [2019-12-07 18:43:42,139 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 06:43:42 WrapperNode [2019-12-07 18:43:42,139 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-07 18:43:42,139 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-07 18:43:42,140 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-07 18:43:42,140 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-07 18:43:42,147 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 06:43:42" (1/1) ... [2019-12-07 18:43:42,157 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 06:43:42" (1/1) ... [2019-12-07 18:43:42,171 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-07 18:43:42,172 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-07 18:43:42,172 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-07 18:43:42,172 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-07 18:43:42,178 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 06:43:42" (1/1) ... [2019-12-07 18:43:42,178 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 06:43:42" (1/1) ... [2019-12-07 18:43:42,180 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 06:43:42" (1/1) ... [2019-12-07 18:43:42,181 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 06:43:42" (1/1) ... [2019-12-07 18:43:42,185 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 06:43:42" (1/1) ... [2019-12-07 18:43:42,189 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 06:43:42" (1/1) ... [2019-12-07 18:43:42,190 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 06:43:42" (1/1) ... [2019-12-07 18:43:42,192 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-07 18:43:42,192 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-07 18:43:42,192 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-07 18:43:42,192 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-07 18:43:42,193 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 06:43:42" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/bin/uautomizer/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 [2019-12-07 18:43:42,232 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-12-07 18:43:42,232 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-12-07 18:43:42,232 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-12-07 18:43:42,232 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2019-12-07 18:43:42,233 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2019-12-07 18:43:42,233 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-12-07 18:43:42,233 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-07 18:43:42,233 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-07 18:43:42,400 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-07 18:43:42,400 INFO L287 CfgBuilder]: Removed 11 assume(true) statements. [2019-12-07 18:43:42,401 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 06:43:42 BoogieIcfgContainer [2019-12-07 18:43:42,401 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-07 18:43:42,402 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-12-07 18:43:42,402 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-12-07 18:43:42,404 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-12-07 18:43:42,404 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 06:43:41" (1/3) ... [2019-12-07 18:43:42,405 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62b0dd21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 06:43:42, skipping insertion in model container [2019-12-07 18:43:42,405 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 06:43:42" (2/3) ... [2019-12-07 18:43:42,406 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62b0dd21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 06:43:42, skipping insertion in model container [2019-12-07 18:43:42,406 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 06:43:42" (3/3) ... [2019-12-07 18:43:42,407 INFO L109 eAbstractionObserver]: Analyzing ICFG alternating_list-2.i [2019-12-07 18:43:42,413 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-12-07 18:43:42,418 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-12-07 18:43:42,425 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-12-07 18:43:42,439 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-12-07 18:43:42,439 INFO L374 AbstractCegarLoop]: Hoare is true [2019-12-07 18:43:42,439 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-12-07 18:43:42,439 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-07 18:43:42,439 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-07 18:43:42,439 INFO L378 AbstractCegarLoop]: Difference is false [2019-12-07 18:43:42,439 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-07 18:43:42,440 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-12-07 18:43:42,448 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2019-12-07 18:43:42,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-12-07 18:43:42,452 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 18:43:42,453 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 18:43:42,453 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 18:43:42,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 18:43:42,456 INFO L82 PathProgramCache]: Analyzing trace with hash -1953862777, now seen corresponding path program 1 times [2019-12-07 18:43:42,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 18:43:42,462 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416162628] [2019-12-07 18:43:42,462 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 18:43:42,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 18:43:42,549 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 18:43:42,549 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416162628] [2019-12-07 18:43:42,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 18:43:42,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-12-07 18:43:42,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405671838] [2019-12-07 18:43:42,553 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-12-07 18:43:42,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 18:43:42,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-12-07 18:43:42,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-12-07 18:43:42,563 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 2 states. [2019-12-07 18:43:42,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 18:43:42,575 INFO L93 Difference]: Finished difference Result 44 states and 61 transitions. [2019-12-07 18:43:42,575 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-12-07 18:43:42,576 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2019-12-07 18:43:42,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 18:43:42,582 INFO L225 Difference]: With dead ends: 44 [2019-12-07 18:43:42,582 INFO L226 Difference]: Without dead ends: 19 [2019-12-07 18:43:42,584 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-12-07 18:43:42,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-12-07 18:43:42,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-12-07 18:43:42,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-12-07 18:43:42,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2019-12-07 18:43:42,608 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 11 [2019-12-07 18:43:42,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 18:43:42,608 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2019-12-07 18:43:42,608 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-12-07 18:43:42,609 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2019-12-07 18:43:42,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-12-07 18:43:42,609 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 18:43:42,609 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 18:43:42,609 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 18:43:42,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 18:43:42,610 INFO L82 PathProgramCache]: Analyzing trace with hash -1732890257, now seen corresponding path program 1 times [2019-12-07 18:43:42,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 18:43:42,610 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358592843] [2019-12-07 18:43:42,610 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 18:43:42,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 18:43:42,664 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 18:43:42,664 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358592843] [2019-12-07 18:43:42,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 18:43:42,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-12-07 18:43:42,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198961390] [2019-12-07 18:43:42,665 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-12-07 18:43:42,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 18:43:42,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-12-07 18:43:42,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-12-07 18:43:42,666 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand 5 states. [2019-12-07 18:43:42,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 18:43:42,731 INFO L93 Difference]: Finished difference Result 44 states and 54 transitions. [2019-12-07 18:43:42,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 18:43:42,732 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2019-12-07 18:43:42,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 18:43:42,733 INFO L225 Difference]: With dead ends: 44 [2019-12-07 18:43:42,733 INFO L226 Difference]: Without dead ends: 33 [2019-12-07 18:43:42,734 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-12-07 18:43:42,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-12-07 18:43:42,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 21. [2019-12-07 18:43:42,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-12-07 18:43:42,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-12-07 18:43:42,739 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 12 [2019-12-07 18:43:42,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 18:43:42,739 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-12-07 18:43:42,739 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-12-07 18:43:42,739 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-12-07 18:43:42,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-12-07 18:43:42,740 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 18:43:42,740 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 18:43:42,740 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 18:43:42,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 18:43:42,740 INFO L82 PathProgramCache]: Analyzing trace with hash 397665306, now seen corresponding path program 1 times [2019-12-07 18:43:42,741 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 18:43:42,741 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198549800] [2019-12-07 18:43:42,741 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 18:43:42,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 18:43:42,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 18:43:42,809 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 18:43:42,809 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-12-07 18:43:42,829 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.12 06:43:42 BoogieIcfgContainer [2019-12-07 18:43:42,829 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-12-07 18:43:42,829 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-12-07 18:43:42,829 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-12-07 18:43:42,830 INFO L275 PluginConnector]: Witness Printer initialized [2019-12-07 18:43:42,830 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 06:43:42" (3/4) ... [2019-12-07 18:43:42,831 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-12-07 18:43:42,864 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_bf902584-376f-486d-8bd2-2ab9b7be08b9/bin/uautomizer/witness.graphml [2019-12-07 18:43:42,864 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-12-07 18:43:42,866 INFO L168 Benchmark]: Toolchain (without parser) took 1081.60 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 93.3 MB). Free memory was 934.0 MB in the beginning and 994.9 MB in the end (delta: -60.8 MB). Peak memory consumption was 32.5 MB. Max. memory is 11.5 GB. [2019-12-07 18:43:42,866 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.0 GB. Free memory is still 955.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 18:43:42,866 INFO L168 Benchmark]: CACSL2BoogieTranslator took 354.44 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 93.3 MB). Free memory was 934.0 MB in the beginning and 1.1 GB in the end (delta: -136.4 MB). Peak memory consumption was 18.4 MB. Max. memory is 11.5 GB. [2019-12-07 18:43:42,867 INFO L168 Benchmark]: Boogie Procedure Inliner took 32.06 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2019-12-07 18:43:42,867 INFO L168 Benchmark]: Boogie Preprocessor took 20.09 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 18:43:42,867 INFO L168 Benchmark]: RCFGBuilder took 209.03 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 21.9 MB). Peak memory consumption was 21.9 MB. Max. memory is 11.5 GB. [2019-12-07 18:43:42,868 INFO L168 Benchmark]: TraceAbstraction took 427.57 ms. Allocated memory is still 1.1 GB. Free memory was 1.0 GB in the beginning and 994.9 MB in the end (delta: 48.3 MB). Peak memory consumption was 48.3 MB. Max. memory is 11.5 GB. [2019-12-07 18:43:42,868 INFO L168 Benchmark]: Witness Printer took 35.00 ms. Allocated memory is still 1.1 GB. Free memory is still 994.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 18:43:42,870 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.0 GB. Free memory is still 955.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 354.44 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 93.3 MB). Free memory was 934.0 MB in the beginning and 1.1 GB in the end (delta: -136.4 MB). Peak memory consumption was 18.4 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 32.06 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 20.09 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 209.03 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 21.9 MB). Peak memory consumption was 21.9 MB. Max. memory is 11.5 GB. * TraceAbstraction took 427.57 ms. Allocated memory is still 1.1 GB. Free memory was 1.0 GB in the beginning and 994.9 MB in the end (delta: 48.3 MB). Peak memory consumption was 48.3 MB. Max. memory is 11.5 GB. * Witness Printer took 35.00 ms. Allocated memory is still 1.1 GB. Free memory is still 994.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 562]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L521] int flag = 1; [L522] List a = (List) malloc(sizeof(struct node)); [L523] COND FALSE !(a == 0) [L524] List t; [L525] List p = a; [L526] COND TRUE __VERIFIER_nondet_int() [L527] COND TRUE \read(flag) [L528] p->h = 2 [L529] flag = 0 [L534] t = (List) malloc(sizeof(struct node)) [L535] COND FALSE !(t == 0) [L536] p->n = t [L537] EXPR p->n [L537] p = p->n [L526] COND FALSE !(__VERIFIER_nondet_int()) [L539] p->h = 3 [L540] p = a [L541] flag = 1 [L542] EXPR p->h [L542] COND TRUE p->h != 3 [L543] COND TRUE \read(flag) [L544] flag = 0 [L545] EXPR p->h [L545] COND TRUE p->h != 1 [L562] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 28 locations, 1 error locations. Result: UNSAFE, OverallTime: 0.3s, OverallIterations: 3, TraceHistogramMax: 2, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 50 SDtfs, 16 SDslu, 38 SDs, 0 SdLazy, 37 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, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=28occurred 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, 12 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 41 NumberOfCodeBlocks, 41 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 21 ConstructedInterpolants, 0 QuantifiedInterpolants, 507 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, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...