./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/string-2.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_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. 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 [2020-11-30 01:36:16,640 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-30 01:36:16,642 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-30 01:36:16,697 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-30 01:36:16,697 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-30 01:36:16,699 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-30 01:36:16,701 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-30 01:36:16,704 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-30 01:36:16,707 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-30 01:36:16,708 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-30 01:36:16,710 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-30 01:36:16,712 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-30 01:36:16,713 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-30 01:36:16,714 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-30 01:36:16,716 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-30 01:36:16,718 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-30 01:36:16,719 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-30 01:36:16,721 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-30 01:36:16,723 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-30 01:36:16,726 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-30 01:36:16,728 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-30 01:36:16,733 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-30 01:36:16,738 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-30 01:36:16,740 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-30 01:36:16,745 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-30 01:36:16,749 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-30 01:36:16,749 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-30 01:36:16,751 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-30 01:36:16,752 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-30 01:36:16,754 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-30 01:36:16,754 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-30 01:36:16,755 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-30 01:36:16,758 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-30 01:36:16,759 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-30 01:36:16,761 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-30 01:36:16,761 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-30 01:36:16,762 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-30 01:36:16,763 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-30 01:36:16,763 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-30 01:36:16,764 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-30 01:36:16,765 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-30 01:36:16,769 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-30 01:36:16,802 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-30 01:36:16,802 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-30 01:36:16,803 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-30 01:36:16,804 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-30 01:36:16,804 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-30 01:36:16,804 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-30 01:36:16,804 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-30 01:36:16,805 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-30 01:36:16,805 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-30 01:36:16,805 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-30 01:36:16,805 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-30 01:36:16,806 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-30 01:36:16,806 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-30 01:36:16,806 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-30 01:36:16,806 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-30 01:36:16,807 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-30 01:36:16,807 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-30 01:36:16,808 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-30 01:36:16,808 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-30 01:36:16,808 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-30 01:36:16,808 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-30 01:36:16,809 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-30 01:36:16,809 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-30 01:36:16,809 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-30 01:36:16,809 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-30 01:36:16,810 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-30 01:36:16,810 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-30 01:36:16,810 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-30 01:36:16,810 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-30 01:36:16,811 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-30 01:36:16,811 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-30 01:36:16,811 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 01:36:16,811 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-30 01:36:16,812 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-30 01:36:16,812 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-30 01:36:16,812 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-30 01:36:16,812 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-30 01:36:16,813 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-30 01:36:16,813 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-30 01:36:16,813 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-30 01:36:16,813 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 [2020-11-30 01:36:17,066 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-30 01:36:17,106 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-30 01:36:17,111 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-30 01:36:17,112 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-30 01:36:17,113 INFO L275 PluginConnector]: CDTParser initialized [2020-11-30 01:36:17,114 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/../../sv-benchmarks/c/loops/string-2.i [2020-11-30 01:36:17,220 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/data/9336cb4f3/6c0a33a2e286494e8c6a503322d63234/FLAG1783e0d3d [2020-11-30 01:36:17,754 INFO L306 CDTParser]: Found 1 translation units. [2020-11-30 01:36:17,755 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/sv-benchmarks/c/loops/string-2.i [2020-11-30 01:36:17,761 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/data/9336cb4f3/6c0a33a2e286494e8c6a503322d63234/FLAG1783e0d3d [2020-11-30 01:36:18,146 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/data/9336cb4f3/6c0a33a2e286494e8c6a503322d63234 [2020-11-30 01:36:18,151 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-30 01:36:18,152 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-30 01:36:18,154 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-30 01:36:18,154 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-30 01:36:18,157 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-30 01:36:18,158 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 01:36:18" (1/1) ... [2020-11-30 01:36:18,160 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3004dd3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:18, skipping insertion in model container [2020-11-30 01:36:18,161 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 01:36:18" (1/1) ... [2020-11-30 01:36:18,168 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-30 01:36:18,185 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-30 01:36:18,427 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 01:36:18,434 INFO L203 MainTranslator]: Completed pre-run [2020-11-30 01:36:18,484 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 01:36:18,512 INFO L208 MainTranslator]: Completed translation [2020-11-30 01:36:18,512 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:18 WrapperNode [2020-11-30 01:36:18,512 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-30 01:36:18,513 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-30 01:36:18,514 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-30 01:36:18,514 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-30 01:36:18,522 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:18" (1/1) ... [2020-11-30 01:36:18,531 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:18" (1/1) ... [2020-11-30 01:36:18,553 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-30 01:36:18,554 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-30 01:36:18,554 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-30 01:36:18,555 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-30 01:36:18,562 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:18" (1/1) ... [2020-11-30 01:36:18,562 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:18" (1/1) ... [2020-11-30 01:36:18,565 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:18" (1/1) ... [2020-11-30 01:36:18,565 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:18" (1/1) ... [2020-11-30 01:36:18,572 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:18" (1/1) ... [2020-11-30 01:36:18,581 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:18" (1/1) ... [2020-11-30 01:36:18,583 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:18" (1/1) ... [2020-11-30 01:36:18,585 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-30 01:36:18,586 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-30 01:36:18,587 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-30 01:36:18,587 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-30 01:36:18,588 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:18" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/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 [2020-11-30 01:36:18,653 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-30 01:36:18,653 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-30 01:36:18,654 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-30 01:36:18,654 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-30 01:36:18,654 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-30 01:36:18,654 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-30 01:36:18,654 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-30 01:36:19,183 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-30 01:36:19,183 INFO L298 CfgBuilder]: Removed 13 assume(true) statements. [2020-11-30 01:36:19,185 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:36:19 BoogieIcfgContainer [2020-11-30 01:36:19,186 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-30 01:36:19,187 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-30 01:36:19,187 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-30 01:36:19,197 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-30 01:36:19,197 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.11 01:36:18" (1/3) ... [2020-11-30 01:36:19,198 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e67e380 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 01:36:19, skipping insertion in model container [2020-11-30 01:36:19,199 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:18" (2/3) ... [2020-11-30 01:36:19,200 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e67e380 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 01:36:19, skipping insertion in model container [2020-11-30 01:36:19,200 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:36:19" (3/3) ... [2020-11-30 01:36:19,201 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-11-30 01:36:19,213 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-30 01:36:19,219 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-30 01:36:19,233 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-30 01:36:19,258 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-30 01:36:19,258 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-30 01:36:19,258 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-30 01:36:19,258 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-30 01:36:19,258 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-30 01:36:19,258 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-30 01:36:19,258 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-30 01:36:19,258 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-30 01:36:19,268 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-11-30 01:36:19,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-30 01:36:19,273 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:36:19,274 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 01:36:19,274 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:36:19,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:36:19,280 INFO L82 PathProgramCache]: Analyzing trace with hash 137572861, now seen corresponding path program 1 times [2020-11-30 01:36:19,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:36:19,290 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020987033] [2020-11-30 01:36:19,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:36:19,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:19,441 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:36:19,442 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020987033] [2020-11-30 01:36:19,442 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 01:36:19,443 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-30 01:36:19,443 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820345776] [2020-11-30 01:36:19,448 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-30 01:36:19,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:36:19,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 01:36:19,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 01:36:19,464 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 3 states. [2020-11-30 01:36:19,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:36:19,518 INFO L93 Difference]: Finished difference Result 47 states and 72 transitions. [2020-11-30 01:36:19,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 01:36:19,519 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-11-30 01:36:19,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:36:19,527 INFO L225 Difference]: With dead ends: 47 [2020-11-30 01:36:19,527 INFO L226 Difference]: Without dead ends: 23 [2020-11-30 01:36:19,530 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 01:36:19,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-11-30 01:36:19,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 18. [2020-11-30 01:36:19,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-11-30 01:36:19,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2020-11-30 01:36:19,577 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 13 [2020-11-30 01:36:19,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:36:19,577 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2020-11-30 01:36:19,578 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-30 01:36:19,578 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2020-11-30 01:36:19,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-11-30 01:36:19,579 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:36:19,580 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 01:36:19,580 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-30 01:36:19,580 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:36:19,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:36:19,584 INFO L82 PathProgramCache]: Analyzing trace with hash 78315596, now seen corresponding path program 1 times [2020-11-30 01:36:19,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:36:19,585 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759684884] [2020-11-30 01:36:19,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:36:19,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:19,664 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-30 01:36:19,664 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759684884] [2020-11-30 01:36:19,664 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445085417] [2020-11-30 01:36:19,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/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 [2020-11-30 01:36:19,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:19,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-30 01:36:19,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:36:19,817 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-30 01:36:19,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:36:19,847 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-30 01:36:19,848 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [101662905] [2020-11-30 01:36:19,875 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-11-30 01:36:19,875 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 01:36:19,880 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 01:36:19,888 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 01:36:19,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 01:36:21,174 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 01:36:21,391 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 58 [2020-11-30 01:36:21,618 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2020-11-30 01:36:21,756 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2020-11-30 01:36:21,910 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 39 [2020-11-30 01:36:22,092 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 44 [2020-11-30 01:36:22,287 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 43 [2020-11-30 01:36:22,504 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 45 [2020-11-30 01:36:22,744 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 49 [2020-11-30 01:36:22,990 WARN L193 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 48 [2020-11-30 01:36:23,177 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 49 [2020-11-30 01:36:23,461 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-11-30 01:36:23,464 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 01:36:23,464 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 01:36:23,464 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2020-11-30 01:36:23,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644385713] [2020-11-30 01:36:23,465 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-30 01:36:23,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:36:23,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-30 01:36:23,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-11-30 01:36:23,466 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 7 states. [2020-11-30 01:36:23,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:36:23,549 INFO L93 Difference]: Finished difference Result 44 states and 57 transitions. [2020-11-30 01:36:23,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-30 01:36:23,549 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-11-30 01:36:23,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:36:23,550 INFO L225 Difference]: With dead ends: 44 [2020-11-30 01:36:23,550 INFO L226 Difference]: Without dead ends: 29 [2020-11-30 01:36:23,552 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-11-30 01:36:23,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-11-30 01:36:23,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 24. [2020-11-30 01:36:23,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-30 01:36:23,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2020-11-30 01:36:23,557 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 17 [2020-11-30 01:36:23,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:36:23,557 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2020-11-30 01:36:23,557 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-30 01:36:23,557 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2020-11-30 01:36:23,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-11-30 01:36:23,558 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:36:23,558 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 01:36:23,766 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-11-30 01:36:23,766 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:36:23,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:36:23,767 INFO L82 PathProgramCache]: Analyzing trace with hash 971216999, now seen corresponding path program 2 times [2020-11-30 01:36:23,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:36:23,767 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851899953] [2020-11-30 01:36:23,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:36:23,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:23,897 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-30 01:36:23,897 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851899953] [2020-11-30 01:36:23,898 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1829070337] [2020-11-30 01:36:23,898 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:36:23,964 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-30 01:36:23,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 01:36:23,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-30 01:36:23,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:36:24,005 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-30 01:36:24,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:36:24,029 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-30 01:36:24,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [353056310] [2020-11-30 01:36:24,036 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-11-30 01:36:24,037 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 01:36:24,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 01:36:24,038 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 01:36:24,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 01:36:24,755 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 01:36:24,958 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 58 [2020-11-30 01:36:25,075 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 30 [2020-11-30 01:36:25,188 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2020-11-30 01:36:25,317 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2020-11-30 01:36:25,492 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 39 [2020-11-30 01:36:25,652 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 44 [2020-11-30 01:36:25,788 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 43 [2020-11-30 01:36:26,014 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 45 [2020-11-30 01:36:26,187 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 49 [2020-11-30 01:36:26,330 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 48 [2020-11-30 01:36:26,481 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 49 [2020-11-30 01:36:26,686 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 62 [2020-11-30 01:36:26,687 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 01:36:26,687 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 01:36:26,688 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 7 [2020-11-30 01:36:26,688 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072847107] [2020-11-30 01:36:26,688 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-30 01:36:26,689 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:36:26,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-30 01:36:26,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2020-11-30 01:36:26,690 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 8 states. [2020-11-30 01:36:26,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:36:26,769 INFO L93 Difference]: Finished difference Result 49 states and 58 transitions. [2020-11-30 01:36:26,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-30 01:36:26,770 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-11-30 01:36:26,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:36:26,771 INFO L225 Difference]: With dead ends: 49 [2020-11-30 01:36:26,771 INFO L226 Difference]: Without dead ends: 31 [2020-11-30 01:36:26,772 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2020-11-30 01:36:26,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-11-30 01:36:26,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2020-11-30 01:36:26,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-30 01:36:26,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-11-30 01:36:26,776 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 23 [2020-11-30 01:36:26,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:36:26,777 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-11-30 01:36:26,777 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-30 01:36:26,777 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-11-30 01:36:26,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-11-30 01:36:26,778 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:36:26,778 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 01:36:26,978 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:36:26,982 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:36:26,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:36:26,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1292619764, now seen corresponding path program 3 times [2020-11-30 01:36:26,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:36:26,982 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127213926] [2020-11-30 01:36:26,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:36:27,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 01:36:27,053 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 01:36:27,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 01:36:27,109 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 01:36:27,140 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-30 01:36:27,140 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-30 01:36:27,141 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2020-11-30 01:36:27,184 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.11 01:36:27 BoogieIcfgContainer [2020-11-30 01:36:27,185 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-30 01:36:27,185 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-30 01:36:27,185 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-30 01:36:27,186 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-30 01:36:27,186 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:36:19" (3/4) ... [2020-11-30 01:36:27,189 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-11-30 01:36:27,189 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-30 01:36:27,190 INFO L168 Benchmark]: Toolchain (without parser) took 9037.75 ms. Allocated memory was 81.8 MB in the beginning and 176.2 MB in the end (delta: 94.4 MB). Free memory was 51.2 MB in the beginning and 76.2 MB in the end (delta: -25.0 MB). Peak memory consumption was 70.7 MB. Max. memory is 16.1 GB. [2020-11-30 01:36:27,191 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 81.8 MB. Free memory was 52.5 MB in the beginning and 52.5 MB in the end (delta: 30.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:36:27,191 INFO L168 Benchmark]: CACSL2BoogieTranslator took 358.75 ms. Allocated memory was 81.8 MB in the beginning and 100.7 MB in the end (delta: 18.9 MB). Free memory was 51.0 MB in the beginning and 76.8 MB in the end (delta: -25.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-30 01:36:27,192 INFO L168 Benchmark]: Boogie Procedure Inliner took 40.02 ms. Allocated memory is still 100.7 MB. Free memory was 76.8 MB in the beginning and 75.1 MB in the end (delta: 1.7 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:36:27,193 INFO L168 Benchmark]: Boogie Preprocessor took 31.51 ms. Allocated memory is still 100.7 MB. Free memory was 75.1 MB in the beginning and 73.6 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 01:36:27,193 INFO L168 Benchmark]: RCFGBuilder took 599.46 ms. Allocated memory is still 100.7 MB. Free memory was 73.6 MB in the beginning and 77.6 MB in the end (delta: -4.0 MB). Peak memory consumption was 25.2 MB. Max. memory is 16.1 GB. [2020-11-30 01:36:27,200 INFO L168 Benchmark]: TraceAbstraction took 7997.44 ms. Allocated memory was 100.7 MB in the beginning and 176.2 MB in the end (delta: 75.5 MB). Free memory was 77.1 MB in the beginning and 76.2 MB in the end (delta: 836.7 kB). Peak memory consumption was 77.9 MB. Max. memory is 16.1 GB. [2020-11-30 01:36:27,201 INFO L168 Benchmark]: Witness Printer took 4.15 ms. Allocated memory is still 176.2 MB. Free memory is still 76.2 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:36:27,203 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 81.8 MB. Free memory was 52.5 MB in the beginning and 52.5 MB in the end (delta: 30.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 358.75 ms. Allocated memory was 81.8 MB in the beginning and 100.7 MB in the end (delta: 18.9 MB). Free memory was 51.0 MB in the beginning and 76.8 MB in the end (delta: -25.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 40.02 ms. Allocated memory is still 100.7 MB. Free memory was 76.8 MB in the beginning and 75.1 MB in the end (delta: 1.7 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 31.51 ms. Allocated memory is still 100.7 MB. Free memory was 75.1 MB in the beginning and 73.6 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 599.46 ms. Allocated memory is still 100.7 MB. Free memory was 73.6 MB in the beginning and 77.6 MB in the end (delta: -4.0 MB). Peak memory consumption was 25.2 MB. Max. memory is 16.1 GB. * TraceAbstraction took 7997.44 ms. Allocated memory was 100.7 MB in the beginning and 176.2 MB in the end (delta: 75.5 MB). Free memory was 77.1 MB in the beginning and 76.2 MB in the end (delta: 836.7 kB). Peak memory consumption was 77.9 MB. Max. memory is 16.1 GB. * Witness Printer took 4.15 ms. Allocated memory is still 176.2 MB. Free memory is still 76.2 MB. There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 12]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 69. Possible FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND FALSE !(i<5) [L37] EXPR string_A[5 -1] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND FALSE !(i<5) [L41] EXPR string_B[5 -1] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 [L44] EXPR string_A[nc_A] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 [L48] EXPR string_B[nc_B] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 [L55] COND FALSE !((inc_B-1)< main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan 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 -> Taipan 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 -> 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 [2020-11-30 01:36:30,240 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-30 01:36:30,272 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-30 01:36:30,274 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-30 01:36:30,276 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-30 01:36:30,276 INFO L275 PluginConnector]: CDTParser initialized [2020-11-30 01:36:30,277 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/../../sv-benchmarks/c/loops/string-2.i [2020-11-30 01:36:30,355 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/data/5a798b202/ffa1bf4a5b2641349fd10fdffab4a403/FLAG61fb036b3 [2020-11-30 01:36:30,846 INFO L306 CDTParser]: Found 1 translation units. [2020-11-30 01:36:30,847 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/sv-benchmarks/c/loops/string-2.i [2020-11-30 01:36:30,856 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/data/5a798b202/ffa1bf4a5b2641349fd10fdffab4a403/FLAG61fb036b3 [2020-11-30 01:36:31,248 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/data/5a798b202/ffa1bf4a5b2641349fd10fdffab4a403 [2020-11-30 01:36:31,250 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-30 01:36:31,252 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-30 01:36:31,253 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-30 01:36:31,254 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-30 01:36:31,257 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-30 01:36:31,258 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 01:36:31" (1/1) ... [2020-11-30 01:36:31,261 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46cda29f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:31, skipping insertion in model container [2020-11-30 01:36:31,266 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 01:36:31" (1/1) ... [2020-11-30 01:36:31,272 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-30 01:36:31,286 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-30 01:36:31,439 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 01:36:31,450 INFO L203 MainTranslator]: Completed pre-run [2020-11-30 01:36:31,523 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 01:36:31,538 INFO L208 MainTranslator]: Completed translation [2020-11-30 01:36:31,538 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:31 WrapperNode [2020-11-30 01:36:31,538 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-30 01:36:31,540 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-30 01:36:31,540 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-30 01:36:31,540 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-30 01:36:31,548 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:31" (1/1) ... [2020-11-30 01:36:31,557 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:31" (1/1) ... [2020-11-30 01:36:31,588 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-30 01:36:31,589 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-30 01:36:31,589 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-30 01:36:31,589 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-30 01:36:31,595 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:31" (1/1) ... [2020-11-30 01:36:31,596 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:31" (1/1) ... [2020-11-30 01:36:31,599 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:31" (1/1) ... [2020-11-30 01:36:31,599 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:31" (1/1) ... [2020-11-30 01:36:31,607 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:31" (1/1) ... [2020-11-30 01:36:31,612 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:31" (1/1) ... [2020-11-30 01:36:31,614 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:31" (1/1) ... [2020-11-30 01:36:31,617 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-30 01:36:31,618 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-30 01:36:31,618 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-30 01:36:31,618 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-30 01:36:31,619 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:31" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/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 [2020-11-30 01:36:31,678 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2020-11-30 01:36:31,678 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2020-11-30 01:36:31,679 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-30 01:36:31,679 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-30 01:36:31,679 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-30 01:36:31,679 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2020-11-30 01:36:31,679 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-30 01:36:32,280 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-30 01:36:32,281 INFO L298 CfgBuilder]: Removed 13 assume(true) statements. [2020-11-30 01:36:32,282 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:36:32 BoogieIcfgContainer [2020-11-30 01:36:32,282 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-30 01:36:32,286 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-30 01:36:32,286 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-30 01:36:32,289 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-30 01:36:32,289 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.11 01:36:31" (1/3) ... [2020-11-30 01:36:32,290 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b342961 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 01:36:32, skipping insertion in model container [2020-11-30 01:36:32,290 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:36:31" (2/3) ... [2020-11-30 01:36:32,291 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b342961 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 01:36:32, skipping insertion in model container [2020-11-30 01:36:32,291 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:36:32" (3/3) ... [2020-11-30 01:36:32,293 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-11-30 01:36:32,304 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-30 01:36:32,309 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-30 01:36:32,322 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-30 01:36:32,363 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-30 01:36:32,364 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-30 01:36:32,364 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-30 01:36:32,364 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-30 01:36:32,365 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-30 01:36:32,365 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-30 01:36:32,365 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-30 01:36:32,365 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-30 01:36:32,381 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-11-30 01:36:32,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-30 01:36:32,387 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:36:32,387 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 01:36:32,388 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:36:32,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:36:32,394 INFO L82 PathProgramCache]: Analyzing trace with hash -610986519, now seen corresponding path program 1 times [2020-11-30 01:36:32,407 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-11-30 01:36:32,408 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1408549447] [2020-11-30 01:36:32,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/mathsat Starting monitored process 2 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with mathsat -unsat_core_generation=3 [2020-11-30 01:36:32,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:32,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 1 conjunts are in the unsatisfiable core [2020-11-30 01:36:32,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:36:32,541 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:36:32,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:36:32,551 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:36:32,552 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1408549447] [2020-11-30 01:36:32,554 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2020-11-30 01:36:32,554 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2020-11-30 01:36:32,564 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109157021] [2020-11-30 01:36:32,568 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-11-30 01:36:32,568 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-11-30 01:36:32,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-11-30 01:36:32,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-30 01:36:32,588 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2020-11-30 01:36:32,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:36:32,624 INFO L93 Difference]: Finished difference Result 53 states and 81 transitions. [2020-11-30 01:36:32,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-11-30 01:36:32,626 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 18 [2020-11-30 01:36:32,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:36:32,636 INFO L225 Difference]: With dead ends: 53 [2020-11-30 01:36:32,636 INFO L226 Difference]: Without dead ends: 24 [2020-11-30 01:36:32,639 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-30 01:36:32,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-30 01:36:32,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-11-30 01:36:32,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-30 01:36:32,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-11-30 01:36:32,678 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 18 [2020-11-30 01:36:32,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:36:32,678 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-11-30 01:36:32,679 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-11-30 01:36:32,679 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-11-30 01:36:32,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-11-30 01:36:32,680 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:36:32,680 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 01:36:32,900 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 mathsat -unsat_core_generation=3 [2020-11-30 01:36:32,903 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:36:32,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:36:32,904 INFO L82 PathProgramCache]: Analyzing trace with hash -2052613417, now seen corresponding path program 1 times [2020-11-30 01:36:32,904 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-11-30 01:36:32,905 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [645278414] [2020-11-30 01:36:32,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/mathsat Starting monitored process 3 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with mathsat -unsat_core_generation=3 [2020-11-30 01:36:32,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:32,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 2 conjunts are in the unsatisfiable core [2020-11-30 01:36:32,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:36:33,008 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:36:33,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:36:33,032 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:36:33,032 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [645278414] [2020-11-30 01:36:33,033 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2020-11-30 01:36:33,033 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2020-11-30 01:36:33,033 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414696161] [2020-11-30 01:36:33,034 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-30 01:36:33,035 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-11-30 01:36:33,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-30 01:36:33,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-11-30 01:36:33,036 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 4 states. [2020-11-30 01:36:33,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:36:33,173 INFO L93 Difference]: Finished difference Result 66 states and 81 transitions. [2020-11-30 01:36:33,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-30 01:36:33,174 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-11-30 01:36:33,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:36:33,177 INFO L225 Difference]: With dead ends: 66 [2020-11-30 01:36:33,177 INFO L226 Difference]: Without dead ends: 46 [2020-11-30 01:36:33,178 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-11-30 01:36:33,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-11-30 01:36:33,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 30. [2020-11-30 01:36:33,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-11-30 01:36:33,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-11-30 01:36:33,185 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 20 [2020-11-30 01:36:33,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:36:33,186 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-11-30 01:36:33,186 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-30 01:36:33,186 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-11-30 01:36:33,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-11-30 01:36:33,187 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:36:33,187 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 01:36:33,399 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 mathsat -unsat_core_generation=3 [2020-11-30 01:36:33,400 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:36:33,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:36:33,400 INFO L82 PathProgramCache]: Analyzing trace with hash -326197737, now seen corresponding path program 1 times [2020-11-30 01:36:33,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-11-30 01:36:33,405 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1300090854] [2020-11-30 01:36:33,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/mathsat Starting monitored process 4 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with mathsat -unsat_core_generation=3 [2020-11-30 01:36:33,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:33,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-30 01:36:33,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:36:33,535 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-30 01:36:33,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:36:33,687 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-30 01:36:33,687 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1300090854] [2020-11-30 01:36:33,687 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1226064837] [2020-11-30 01:36:33,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2020-11-30 01:36:33,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:33,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-30 01:36:33,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:36:33,829 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-30 01:36:33,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:36:33,916 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-30 01:36:33,916 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122891600] [2020-11-30 01:36:33,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:36:33,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:33,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-30 01:36:33,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:36:34,060 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-11-30 01:36:34,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:36:34,080 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-11-30 01:36:34,190 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-11-30 01:36:34,190 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2020-11-30 01:36:34,190 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [5, 6, 5, 5] total 14 [2020-11-30 01:36:34,191 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178266731] [2020-11-30 01:36:34,191 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-30 01:36:34,191 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-11-30 01:36:34,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-30 01:36:34,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2020-11-30 01:36:34,192 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 7 states. [2020-11-30 01:36:34,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:36:34,521 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2020-11-30 01:36:34,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-30 01:36:34,522 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2020-11-30 01:36:34,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:36:34,523 INFO L225 Difference]: With dead ends: 47 [2020-11-30 01:36:34,523 INFO L226 Difference]: Without dead ends: 33 [2020-11-30 01:36:34,524 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 148 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2020-11-30 01:36:34,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-11-30 01:36:34,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-11-30 01:36:34,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-11-30 01:36:34,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2020-11-30 01:36:34,529 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 28 [2020-11-30 01:36:34,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:36:34,529 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2020-11-30 01:36:34,530 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-30 01:36:34,530 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2020-11-30 01:36:34,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-11-30 01:36:34,530 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:36:34,531 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 01:36:35,146 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 mathsat -unsat_core_generation=3,5 cvc4 --incremental --print-success --lang smt --rewrite-divk,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:36:35,146 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:36:35,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:36:35,147 INFO L82 PathProgramCache]: Analyzing trace with hash 133280437, now seen corresponding path program 1 times [2020-11-30 01:36:35,147 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-11-30 01:36:35,147 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [855260968] [2020-11-30 01:36:35,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/mathsat Starting monitored process 7 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with mathsat -unsat_core_generation=3 [2020-11-30 01:36:35,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:35,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-30 01:36:35,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:36:35,247 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-11-30 01:36:35,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:36:35,358 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-11-30 01:36:35,358 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [855260968] [2020-11-30 01:36:35,358 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1725607470] [2020-11-30 01:36:35,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/cvc4 Starting monitored process 8 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2020-11-30 01:36:35,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:35,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-30 01:36:35,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:36:35,495 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-11-30 01:36:35,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:36:35,536 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-11-30 01:36:35,536 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [261946277] [2020-11-30 01:36:35,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:36:35,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:35,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-30 01:36:35,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:36:35,657 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-30 01:36:35,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:36:35,702 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-30 01:36:35,703 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2020-11-30 01:36:35,703 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 6, 5, 5] total 13 [2020-11-30 01:36:35,703 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147489206] [2020-11-30 01:36:35,704 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-30 01:36:35,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-11-30 01:36:35,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-30 01:36:35,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2020-11-30 01:36:35,705 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand 6 states. [2020-11-30 01:36:35,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:36:35,802 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-11-30 01:36:35,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-30 01:36:35,804 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2020-11-30 01:36:35,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:36:35,805 INFO L225 Difference]: With dead ends: 50 [2020-11-30 01:36:35,805 INFO L226 Difference]: Without dead ends: 35 [2020-11-30 01:36:35,806 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 174 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2020-11-30 01:36:35,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-11-30 01:36:35,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-11-30 01:36:35,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-11-30 01:36:35,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2020-11-30 01:36:35,818 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 32 [2020-11-30 01:36:35,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:36:35,818 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2020-11-30 01:36:35,818 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-30 01:36:35,818 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2020-11-30 01:36:35,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-11-30 01:36:35,819 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:36:35,820 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 01:36:36,431 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,7 mathsat -unsat_core_generation=3,8 cvc4 --incremental --print-success --lang smt --rewrite-divk [2020-11-30 01:36:36,432 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:36:36,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:36:36,433 INFO L82 PathProgramCache]: Analyzing trace with hash -2061676326, now seen corresponding path program 1 times [2020-11-30 01:36:36,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-11-30 01:36:36,433 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1711256276] [2020-11-30 01:36:36,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/mathsat Starting monitored process 10 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with mathsat -unsat_core_generation=3 [2020-11-30 01:36:36,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:36,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-30 01:36:36,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:36:36,547 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-30 01:36:36,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:36:36,680 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-30 01:36:36,681 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1711256276] [2020-11-30 01:36:36,681 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1257894011] [2020-11-30 01:36:36,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/cvc4 Starting monitored process 11 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2020-11-30 01:36:36,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:36,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-30 01:36:36,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:36:36,830 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-30 01:36:36,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:36:36,864 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-30 01:36:36,865 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148528580] [2020-11-30 01:36:36,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:36:36,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:36:36,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-30 01:36:36,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:36:36,949 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-30 01:36:36,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:36:36,954 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-30 01:36:36,954 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2020-11-30 01:36:36,955 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 5, 5, 5, 5] total 10 [2020-11-30 01:36:36,955 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152719549] [2020-11-30 01:36:36,956 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-30 01:36:36,956 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-11-30 01:36:36,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-30 01:36:36,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2020-11-30 01:36:36,957 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand 10 states. [2020-11-30 01:36:37,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:36:37,390 INFO L93 Difference]: Finished difference Result 108 states and 128 transitions. [2020-11-30 01:36:37,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-30 01:36:37,391 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 34 [2020-11-30 01:36:37,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:36:37,392 INFO L225 Difference]: With dead ends: 108 [2020-11-30 01:36:37,393 INFO L226 Difference]: Without dead ends: 80 [2020-11-30 01:36:37,393 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 189 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2020-11-30 01:36:37,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-11-30 01:36:37,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 47. [2020-11-30 01:36:37,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-11-30 01:36:37,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 52 transitions. [2020-11-30 01:36:37,403 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 52 transitions. Word has length 34 [2020-11-30 01:36:37,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:36:37,404 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 52 transitions. [2020-11-30 01:36:37,404 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-30 01:36:37,404 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 52 transitions. [2020-11-30 01:36:37,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-11-30 01:36:37,405 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:36:37,406 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 01:36:38,028 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 mathsat -unsat_core_generation=3,11 cvc4 --incremental --print-success --lang smt --rewrite-divk [2020-11-30 01:36:38,028 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:36:38,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:36:38,029 INFO L82 PathProgramCache]: Analyzing trace with hash 1658933818, now seen corresponding path program 2 times [2020-11-30 01:36:38,029 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-11-30 01:36:38,030 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1891578156] [2020-11-30 01:36:38,030 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/mathsat Starting monitored process 13 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with mathsat -unsat_core_generation=3 [2020-11-30 01:36:38,164 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-30 01:36:38,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-11-30 01:36:38,165 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 01:36:38,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 01:36:38,307 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 01:36:38,385 INFO L173 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2020-11-30 01:36:38,385 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-30 01:36:38,595 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 mathsat -unsat_core_generation=3 [2020-11-30 01:36:38,667 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.11 01:36:38 BoogieIcfgContainer [2020-11-30 01:36:38,670 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-30 01:36:38,671 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-30 01:36:38,671 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-30 01:36:38,671 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-30 01:36:38,672 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:36:32" (3/4) ... [2020-11-30 01:36:38,674 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-30 01:36:38,763 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_51d7d575-62a7-4ddf-9b87-f0558bfdcb03/bin/utaipan/witness.graphml [2020-11-30 01:36:38,764 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-30 01:36:38,766 INFO L168 Benchmark]: Toolchain (without parser) took 7512.87 ms. Allocated memory was 58.7 MB in the beginning and 96.5 MB in the end (delta: 37.7 MB). Free memory was 37.8 MB in the beginning and 74.7 MB in the end (delta: -36.8 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:36:38,766 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 58.7 MB. Free memory was 41.3 MB in the beginning and 41.3 MB in the end (delta: 44.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:36:38,767 INFO L168 Benchmark]: CACSL2BoogieTranslator took 285.30 ms. Allocated memory is still 58.7 MB. Free memory was 37.7 MB in the beginning and 41.6 MB in the end (delta: -3.9 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-30 01:36:38,767 INFO L168 Benchmark]: Boogie Procedure Inliner took 48.65 ms. Allocated memory is still 58.7 MB. Free memory was 41.6 MB in the beginning and 39.9 MB in the end (delta: 1.7 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:36:38,768 INFO L168 Benchmark]: Boogie Preprocessor took 28.17 ms. Allocated memory is still 58.7 MB. Free memory was 39.9 MB in the beginning and 38.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-11-30 01:36:38,769 INFO L168 Benchmark]: RCFGBuilder took 664.76 ms. Allocated memory was 58.7 MB in the beginning and 79.7 MB in the end (delta: 21.0 MB). Free memory was 38.4 MB in the beginning and 57.6 MB in the end (delta: -19.1 MB). Peak memory consumption was 13.7 MB. Max. memory is 16.1 GB. [2020-11-30 01:36:38,770 INFO L168 Benchmark]: TraceAbstraction took 6384.78 ms. Allocated memory was 79.7 MB in the beginning and 96.5 MB in the end (delta: 16.8 MB). Free memory was 57.2 MB in the beginning and 77.9 MB in the end (delta: -20.8 MB). Peak memory consumption was 45.4 MB. Max. memory is 16.1 GB. [2020-11-30 01:36:38,770 INFO L168 Benchmark]: Witness Printer took 92.90 ms. Allocated memory is still 96.5 MB. Free memory was 77.9 MB in the beginning and 74.7 MB in the end (delta: 3.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 01:36:38,775 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 58.7 MB. Free memory was 41.3 MB in the beginning and 41.3 MB in the end (delta: 44.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 285.30 ms. Allocated memory is still 58.7 MB. Free memory was 37.7 MB in the beginning and 41.6 MB in the end (delta: -3.9 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 48.65 ms. Allocated memory is still 58.7 MB. Free memory was 41.6 MB in the beginning and 39.9 MB in the end (delta: 1.7 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 28.17 ms. Allocated memory is still 58.7 MB. Free memory was 39.9 MB in the beginning and 38.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * RCFGBuilder took 664.76 ms. Allocated memory was 58.7 MB in the beginning and 79.7 MB in the end (delta: 21.0 MB). Free memory was 38.4 MB in the beginning and 57.6 MB in the end (delta: -19.1 MB). Peak memory consumption was 13.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 6384.78 ms. Allocated memory was 79.7 MB in the beginning and 96.5 MB in the end (delta: 16.8 MB). Free memory was 57.2 MB in the beginning and 77.9 MB in the end (delta: -20.8 MB). Peak memory consumption was 45.4 MB. Max. memory is 16.1 GB. * Witness Printer took 92.90 ms. Allocated memory is still 96.5 MB. Free memory was 77.9 MB in the beginning and 74.7 MB in the end (delta: 3.3 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: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND FALSE !(i<5) [L37] EXPR string_A[5 -1] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND FALSE !(i<5) [L41] EXPR string_B[5 -1] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 [L44] EXPR string_A[nc_A] [L44] COND TRUE string_A[nc_A]!='\0' [L45] nc_A++ [L44] EXPR string_A[nc_A] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 [L48] EXPR string_B[nc_B] [L48] COND TRUE string_B[nc_B]!='\0' [L49] nc_B++ [L48] EXPR string_B[nc_B] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 [L55] COND TRUE (inc_B-1)<