./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-ext2-properties/simple_and_skiplist_2lvl-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/list-ext2-properties/simple_and_skiplist_2lvl-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer --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 997512b29ff7fdf1190aebf9d039045a1841d533 .................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.2.0-a4ecdab [2020-11-29 23:28:30,754 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-29 23:28:30,757 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-29 23:28:30,807 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-29 23:28:30,808 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-29 23:28:30,814 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-29 23:28:30,818 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-29 23:28:30,822 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-29 23:28:30,825 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-29 23:28:30,833 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-29 23:28:30,834 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-29 23:28:30,836 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-29 23:28:30,837 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-29 23:28:30,840 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-29 23:28:30,842 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-29 23:28:30,843 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-29 23:28:30,844 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-29 23:28:30,846 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-29 23:28:30,852 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-29 23:28:30,862 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-29 23:28:30,864 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-29 23:28:30,865 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-29 23:28:30,867 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-29 23:28:30,868 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-29 23:28:30,871 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-29 23:28:30,872 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-29 23:28:30,872 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-29 23:28:30,874 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-29 23:28:30,875 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-29 23:28:30,876 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-29 23:28:30,876 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-29 23:28:30,877 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-29 23:28:30,879 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-29 23:28:30,880 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-29 23:28:30,881 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-29 23:28:30,882 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-29 23:28:30,882 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-29 23:28:30,883 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-29 23:28:30,883 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-29 23:28:30,884 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-29 23:28:30,884 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-29 23:28:30,887 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-29 23:28:30,927 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-29 23:28:30,927 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-29 23:28:30,928 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-29 23:28:30,928 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-29 23:28:30,928 INFO L138 SettingsManager]: * Use SBE=true [2020-11-29 23:28:30,928 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-29 23:28:30,929 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-29 23:28:30,929 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-29 23:28:30,929 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-29 23:28:30,929 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-29 23:28:30,929 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-29 23:28:30,930 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-29 23:28:30,930 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-29 23:28:30,930 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-29 23:28:30,930 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-29 23:28:30,930 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-29 23:28:30,930 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-29 23:28:30,931 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-29 23:28:30,931 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-29 23:28:30,931 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-29 23:28:30,931 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-29 23:28:30,932 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-29 23:28:30,932 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-29 23:28:30,932 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-29 23:28:30,932 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-29 23:28:30,932 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-29 23:28:30,933 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-29 23:28:30,933 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-29 23:28:30,933 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-29 23:28:30,933 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 997512b29ff7fdf1190aebf9d039045a1841d533 [2020-11-29 23:28:31,221 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-29 23:28:31,259 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-29 23:28:31,262 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-29 23:28:31,263 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-29 23:28:31,264 INFO L275 PluginConnector]: CDTParser initialized [2020-11-29 23:28:31,265 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer/../../sv-benchmarks/c/list-ext2-properties/simple_and_skiplist_2lvl-1.i [2020-11-29 23:28:31,339 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer/data/eabc847f1/16f83e24c0ec4e3a904d62954140c570/FLAG52bb342ea [2020-11-29 23:28:31,869 INFO L306 CDTParser]: Found 1 translation units. [2020-11-29 23:28:31,869 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/sv-benchmarks/c/list-ext2-properties/simple_and_skiplist_2lvl-1.i [2020-11-29 23:28:31,893 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer/data/eabc847f1/16f83e24c0ec4e3a904d62954140c570/FLAG52bb342ea [2020-11-29 23:28:32,133 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer/data/eabc847f1/16f83e24c0ec4e3a904d62954140c570 [2020-11-29 23:28:32,135 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-29 23:28:32,137 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-29 23:28:32,140 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-29 23:28:32,140 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-29 23:28:32,143 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-29 23:28:32,143 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 11:28:32" (1/1) ... [2020-11-29 23:28:32,145 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32480d43 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:28:32, skipping insertion in model container [2020-11-29 23:28:32,145 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 11:28:32" (1/1) ... [2020-11-29 23:28:32,151 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-29 23:28:32,196 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-29 23:28:32,614 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 23:28:32,626 INFO L203 MainTranslator]: Completed pre-run [2020-11-29 23:28:32,677 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 23:28:32,730 INFO L208 MainTranslator]: Completed translation [2020-11-29 23:28:32,730 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:28:32 WrapperNode [2020-11-29 23:28:32,731 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-29 23:28:32,732 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-29 23:28:32,732 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-29 23:28:32,732 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-29 23:28:32,740 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:28:32" (1/1) ... [2020-11-29 23:28:32,775 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:28:32" (1/1) ... [2020-11-29 23:28:32,811 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-29 23:28:32,812 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-29 23:28:32,812 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-29 23:28:32,813 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-29 23:28:32,821 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:28:32" (1/1) ... [2020-11-29 23:28:32,821 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:28:32" (1/1) ... [2020-11-29 23:28:32,825 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:28:32" (1/1) ... [2020-11-29 23:28:32,826 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:28:32" (1/1) ... [2020-11-29 23:28:32,836 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:28:32" (1/1) ... [2020-11-29 23:28:32,841 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:28:32" (1/1) ... [2020-11-29 23:28:32,845 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:28:32" (1/1) ... [2020-11-29 23:28:32,855 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-29 23:28:32,856 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-29 23:28:32,856 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-29 23:28:32,856 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-29 23:28:32,864 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:28:32" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/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 [2020-11-29 23:28:32,956 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-29 23:28:32,956 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-29 23:28:32,957 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-11-29 23:28:32,958 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-11-29 23:28:32,958 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-29 23:28:32,958 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-11-29 23:28:32,959 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-29 23:28:32,959 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-29 23:28:32,959 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-29 23:28:32,960 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-29 23:28:33,598 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-29 23:28:33,598 INFO L298 CfgBuilder]: Removed 22 assume(true) statements. [2020-11-29 23:28:33,602 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 11:28:33 BoogieIcfgContainer [2020-11-29 23:28:33,603 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-29 23:28:33,605 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-29 23:28:33,605 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-29 23:28:33,610 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-29 23:28:33,610 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.11 11:28:32" (1/3) ... [2020-11-29 23:28:33,611 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a430ca0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 11:28:33, skipping insertion in model container [2020-11-29 23:28:33,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:28:32" (2/3) ... [2020-11-29 23:28:33,611 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a430ca0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 11:28:33, skipping insertion in model container [2020-11-29 23:28:33,612 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 11:28:33" (3/3) ... [2020-11-29 23:28:33,613 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_and_skiplist_2lvl-1.i [2020-11-29 23:28:33,629 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-29 23:28:33,633 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-29 23:28:33,645 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-29 23:28:33,680 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-29 23:28:33,680 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-29 23:28:33,681 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-29 23:28:33,681 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-29 23:28:33,681 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-29 23:28:33,681 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-29 23:28:33,681 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-29 23:28:33,681 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-29 23:28:33,693 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2020-11-29 23:28:33,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-11-29 23:28:33,698 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:28:33,699 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 23:28:33,699 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:28:33,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:28:33,704 INFO L82 PathProgramCache]: Analyzing trace with hash 220216549, now seen corresponding path program 1 times [2020-11-29 23:28:33,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 23:28:33,713 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270429359] [2020-11-29 23:28:33,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 23:28:33,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:28:33,843 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 23:28:33,844 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270429359] [2020-11-29 23:28:33,845 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 23:28:33,845 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-29 23:28:33,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585930708] [2020-11-29 23:28:33,850 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-11-29 23:28:33,850 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 23:28:33,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-11-29 23:28:33,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-29 23:28:33,865 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 2 states. [2020-11-29 23:28:33,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:28:33,883 INFO L93 Difference]: Finished difference Result 69 states and 101 transitions. [2020-11-29 23:28:33,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-11-29 23:28:33,884 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-11-29 23:28:33,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:28:33,892 INFO L225 Difference]: With dead ends: 69 [2020-11-29 23:28:33,892 INFO L226 Difference]: Without dead ends: 16 [2020-11-29 23:28:33,895 INFO L677 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 [2020-11-29 23:28:33,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-11-29 23:28:33,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-11-29 23:28:33,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-11-29 23:28:33,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2020-11-29 23:28:33,925 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2020-11-29 23:28:33,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:28:33,926 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2020-11-29 23:28:33,926 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-11-29 23:28:33,926 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2020-11-29 23:28:33,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-11-29 23:28:33,927 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:28:33,927 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 23:28:33,927 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-29 23:28:33,928 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:28:33,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:28:33,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1936219756, now seen corresponding path program 1 times [2020-11-29 23:28:33,929 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 23:28:33,929 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1078061890] [2020-11-29 23:28:33,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 23:28:33,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:28:34,030 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 23:28:34,031 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1078061890] [2020-11-29 23:28:34,031 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 23:28:34,031 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-29 23:28:34,031 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631067485] [2020-11-29 23:28:34,033 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-29 23:28:34,033 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 23:28:34,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-29 23:28:34,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-29 23:28:34,034 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 5 states. [2020-11-29 23:28:34,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:28:34,184 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2020-11-29 23:28:34,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-29 23:28:34,184 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-11-29 23:28:34,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:28:34,185 INFO L225 Difference]: With dead ends: 35 [2020-11-29 23:28:34,185 INFO L226 Difference]: Without dead ends: 31 [2020-11-29 23:28:34,186 INFO L677 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 [2020-11-29 23:28:34,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-11-29 23:28:34,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 21. [2020-11-29 23:28:34,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-11-29 23:28:34,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-11-29 23:28:34,195 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 12 [2020-11-29 23:28:34,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:28:34,195 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-11-29 23:28:34,195 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-29 23:28:34,195 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-11-29 23:28:34,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-11-29 23:28:34,196 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:28:34,196 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 23:28:34,196 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-29 23:28:34,197 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:28:34,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:28:34,197 INFO L82 PathProgramCache]: Analyzing trace with hash -1496568487, now seen corresponding path program 1 times [2020-11-29 23:28:34,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 23:28:34,198 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815945297] [2020-11-29 23:28:34,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 23:28:34,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:28:34,401 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 23:28:34,402 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815945297] [2020-11-29 23:28:34,402 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323564791] [2020-11-29 23:28:34,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer/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 [2020-11-29 23:28:34,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:28:34,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 19 conjunts are in the unsatisfiable core [2020-11-29 23:28:34,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 23:28:34,576 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2020-11-29 23:28:34,577 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 23:28:34,590 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 23:28:34,593 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2020-11-29 23:28:34,593 INFO L545 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2020-11-29 23:28:34,605 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 23:28:34,606 INFO L545 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 23:28:34,606 INFO L244 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:26, output treesize:18 [2020-11-29 23:28:34,659 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2020-11-29 23:28:34,659 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 23:28:34,667 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 23:28:34,671 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2020-11-29 23:28:34,671 INFO L545 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2020-11-29 23:28:34,677 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 23:28:34,678 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 23:28:34,678 INFO L244 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:29, output treesize:7 [2020-11-29 23:28:34,680 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 23:28:34,680 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 23:28:34,681 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2020-11-29 23:28:34,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706095674] [2020-11-29 23:28:34,681 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-29 23:28:34,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 23:28:34,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-29 23:28:34,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-11-29 23:28:34,682 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 6 states. [2020-11-29 23:28:34,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:28:34,783 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2020-11-29 23:28:34,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-29 23:28:34,785 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-11-29 23:28:34,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:28:34,786 INFO L225 Difference]: With dead ends: 39 [2020-11-29 23:28:34,786 INFO L226 Difference]: Without dead ends: 27 [2020-11-29 23:28:34,787 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-11-29 23:28:34,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-11-29 23:28:34,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 18. [2020-11-29 23:28:34,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-11-29 23:28:34,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-11-29 23:28:34,790 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 15 [2020-11-29 23:28:34,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:28:34,791 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-11-29 23:28:34,791 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-29 23:28:34,791 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-11-29 23:28:34,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-11-29 23:28:34,794 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:28:34,794 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 23:28:34,995 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-29 23:28:34,995 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:28:34,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:28:34,995 INFO L82 PathProgramCache]: Analyzing trace with hash -2013732869, now seen corresponding path program 1 times [2020-11-29 23:28:34,996 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 23:28:34,996 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [282387653] [2020-11-29 23:28:34,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 23:28:35,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 23:28:35,040 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 23:28:35,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 23:28:35,104 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 23:28:35,139 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 23:28:35,140 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-29 23:28:35,140 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-29 23:28:35,186 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 29.11 11:28:35 BoogieIcfgContainer [2020-11-29 23:28:35,186 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-29 23:28:35,187 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-29 23:28:35,187 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-29 23:28:35,187 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-29 23:28:35,188 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 11:28:33" (3/4) ... [2020-11-29 23:28:35,189 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-29 23:28:35,235 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_91d1488a-fc50-40c8-a002-63430de66307/bin/uautomizer/witness.graphml [2020-11-29 23:28:35,236 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-29 23:28:35,245 INFO L168 Benchmark]: Toolchain (without parser) took 3107.86 ms. Allocated memory was 90.2 MB in the beginning and 109.1 MB in the end (delta: 18.9 MB). Free memory was 53.4 MB in the beginning and 78.3 MB in the end (delta: -24.8 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 23:28:35,246 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 90.2 MB. Free memory was 71.0 MB in the beginning and 70.9 MB in the end (delta: 65.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 23:28:35,247 INFO L168 Benchmark]: CACSL2BoogieTranslator took 591.38 ms. Allocated memory is still 90.2 MB. Free memory was 53.3 MB in the beginning and 53.7 MB in the end (delta: -421.6 kB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2020-11-29 23:28:35,247 INFO L168 Benchmark]: Boogie Procedure Inliner took 79.85 ms. Allocated memory is still 90.2 MB. Free memory was 53.7 MB in the beginning and 51.3 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-29 23:28:35,248 INFO L168 Benchmark]: Boogie Preprocessor took 43.07 ms. Allocated memory is still 90.2 MB. Free memory was 51.3 MB in the beginning and 49.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-29 23:28:35,249 INFO L168 Benchmark]: RCFGBuilder took 746.60 ms. Allocated memory was 90.2 MB in the beginning and 109.1 MB in the end (delta: 18.9 MB). Free memory was 49.2 MB in the beginning and 69.9 MB in the end (delta: -20.8 MB). Peak memory consumption was 21.1 MB. Max. memory is 16.1 GB. [2020-11-29 23:28:35,249 INFO L168 Benchmark]: TraceAbstraction took 1581.76 ms. Allocated memory is still 109.1 MB. Free memory was 69.3 MB in the beginning and 81.2 MB in the end (delta: -11.8 MB). Peak memory consumption was 37.2 MB. Max. memory is 16.1 GB. [2020-11-29 23:28:35,250 INFO L168 Benchmark]: Witness Printer took 56.64 ms. Allocated memory is still 109.1 MB. Free memory was 81.2 MB in the beginning and 78.3 MB in the end (delta: 2.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-29 23:28:35,254 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 90.2 MB. Free memory was 71.0 MB in the beginning and 70.9 MB in the end (delta: 65.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 591.38 ms. Allocated memory is still 90.2 MB. Free memory was 53.3 MB in the beginning and 53.7 MB in the end (delta: -421.6 kB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 79.85 ms. Allocated memory is still 90.2 MB. Free memory was 53.7 MB in the beginning and 51.3 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 43.07 ms. Allocated memory is still 90.2 MB. Free memory was 51.3 MB in the beginning and 49.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 746.60 ms. Allocated memory was 90.2 MB in the beginning and 109.1 MB in the end (delta: 18.9 MB). Free memory was 49.2 MB in the beginning and 69.9 MB in the end (delta: -20.8 MB). Peak memory consumption was 21.1 MB. Max. memory is 16.1 GB. * TraceAbstraction took 1581.76 ms. Allocated memory is still 109.1 MB. Free memory was 69.3 MB in the beginning and 81.2 MB in the end (delta: -11.8 MB). Peak memory consumption was 37.2 MB. Max. memory is 16.1 GB. * Witness Printer took 56.64 ms. Allocated memory is still 109.1 MB. Free memory was 81.2 MB in the beginning and 78.3 MB in the end (delta: 2.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 12]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L596] List a = (List) malloc(sizeof(struct node)); [L597] COND FALSE !(a == 0) [L598] List t; [L599] List p = a; [L600] a->h = 2 [L601] COND TRUE __VERIFIER_nondet_int() [L602] p->h = 1 [L603] t = (List) malloc(sizeof(struct node)) [L604] COND FALSE !(t == 0) [L605] p->n = t [L606] EXPR p->n [L606] p = p->n [L601] COND FALSE !(__VERIFIER_nondet_int()) [L608] p->h = 2 [L609] p->n = 0 [L610] p = a [L611] COND TRUE p!=0 [L612] EXPR p->h [L612] COND TRUE p->h != 2 [L12] COND FALSE !(0) [L12] __assert_fail ("0", "simple_and_skiplist_2lvl-1.c", 3, __extension__ __PRETTY_FUNCTION__) - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 40 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.4s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 74 SDtfs, 47 SDslu, 62 SDs, 0 SdLazy, 59 SolverSat, 12 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 31 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=40occurred 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, 3 MinimizatonAttempts, 19 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 69 NumberOfCodeBlocks, 69 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 49 ConstructedInterpolants, 0 QuantifiedInterpolants, 3699 SizeOfPredicates, 7 NumberOfNonLiveVariables, 74 ConjunctsInSsa, 19 ConjunctsInUnsatCore, 4 InterpolantComputations, 2 PerfectInterpolantSequences, 2/4 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...