./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 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/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_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/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 0.2.0-7b2dab5 [2020-12-09 05:12:36,743 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 05:12:36,745 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 05:12:36,767 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 05:12:36,767 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 05:12:36,768 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 05:12:36,769 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 05:12:36,771 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 05:12:36,772 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 05:12:36,773 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 05:12:36,774 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 05:12:36,775 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 05:12:36,775 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 05:12:36,776 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 05:12:36,777 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 05:12:36,778 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 05:12:36,778 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 05:12:36,779 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 05:12:36,780 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 05:12:36,782 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 05:12:36,784 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 05:12:36,785 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 05:12:36,786 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 05:12:36,787 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 05:12:36,789 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 05:12:36,789 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 05:12:36,790 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 05:12:36,790 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 05:12:36,791 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 05:12:36,792 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 05:12:36,792 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 05:12:36,793 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 05:12:36,793 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 05:12:36,794 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 05:12:36,795 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 05:12:36,795 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 05:12:36,795 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 05:12:36,796 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 05:12:36,796 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 05:12:36,797 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 05:12:36,797 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 05:12:36,798 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-09 05:12:36,822 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 05:12:36,822 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 05:12:36,822 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 05:12:36,823 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 05:12:36,823 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 05:12:36,823 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 05:12:36,823 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 05:12:36,823 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 05:12:36,823 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 05:12:36,823 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 05:12:36,823 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 05:12:36,824 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 05:12:36,824 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 05:12:36,824 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 05:12:36,824 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 05:12:36,825 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 05:12:36,825 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 05:12:36,825 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 05:12:36,825 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 05:12:36,825 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 05:12:36,825 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 05:12:36,825 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 05:12:36,826 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 05:12:36,826 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 05:12:36,826 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 05:12:36,826 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 05:12:36,826 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 05:12:36,826 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 05:12:36,826 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 05:12:36,826 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 05:12:36,826 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 05:12:36,827 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 05:12:36,827 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 05:12:36,827 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 05:12:36,827 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 05:12:36,827 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 05:12:36,827 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 05:12:36,827 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 05:12:36,827 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 05:12:36,827 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_860fca31-a163-42be-bdea-ad46b5a100c5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 [2020-12-09 05:12:37,013 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 05:12:37,034 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 05:12:37,036 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 05:12:37,037 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 05:12:37,038 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 05:12:37,038 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/../../sv-benchmarks/c/loops/string-2.i [2020-12-09 05:12:37,084 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/data/d220f5e96/a1a5977904bb40428c61fa11be166e3f/FLAG6ca3488cb [2020-12-09 05:12:37,451 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 05:12:37,452 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/sv-benchmarks/c/loops/string-2.i [2020-12-09 05:12:37,458 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/data/d220f5e96/a1a5977904bb40428c61fa11be166e3f/FLAG6ca3488cb [2020-12-09 05:12:37,467 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/data/d220f5e96/a1a5977904bb40428c61fa11be166e3f [2020-12-09 05:12:37,469 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 05:12:37,470 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 05:12:37,471 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 05:12:37,471 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 05:12:37,473 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 05:12:37,474 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:12:37" (1/1) ... [2020-12-09 05:12:37,475 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@323bd683 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:37, skipping insertion in model container [2020-12-09 05:12:37,475 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:12:37" (1/1) ... [2020-12-09 05:12:37,486 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 05:12:37,501 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 05:12:37,594 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/sv-benchmarks/c/loops/string-2.i[896,909] [2020-12-09 05:12:37,609 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 05:12:37,614 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 05:12:37,626 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/sv-benchmarks/c/loops/string-2.i[896,909] [2020-12-09 05:12:37,636 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 05:12:37,648 INFO L208 MainTranslator]: Completed translation [2020-12-09 05:12:37,649 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:37 WrapperNode [2020-12-09 05:12:37,649 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 05:12:37,650 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 05:12:37,650 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 05:12:37,650 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 05:12:37,658 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:37" (1/1) ... [2020-12-09 05:12:37,665 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:37" (1/1) ... [2020-12-09 05:12:37,684 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 05:12:37,685 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 05:12:37,685 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 05:12:37,686 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 05:12:37,692 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:37" (1/1) ... [2020-12-09 05:12:37,692 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:37" (1/1) ... [2020-12-09 05:12:37,695 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:37" (1/1) ... [2020-12-09 05:12:37,695 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:37" (1/1) ... [2020-12-09 05:12:37,700 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:37" (1/1) ... [2020-12-09 05:12:37,705 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:37" (1/1) ... [2020-12-09 05:12:37,707 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:37" (1/1) ... [2020-12-09 05:12:37,709 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 05:12:37,710 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 05:12:37,710 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 05:12:37,710 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 05:12:37,711 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:37" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/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 [2020-12-09 05:12:37,761 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-09 05:12:37,761 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 05:12:37,761 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-09 05:12:37,762 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 05:12:37,762 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 05:12:37,762 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-09 05:12:37,762 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-09 05:12:38,022 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 05:12:38,022 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2020-12-09 05:12:38,023 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:12:38 BoogieIcfgContainer [2020-12-09 05:12:38,024 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 05:12:38,025 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 05:12:38,025 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 05:12:38,028 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 05:12:38,028 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 05:12:37" (1/3) ... [2020-12-09 05:12:38,028 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66f4b8af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:12:38, skipping insertion in model container [2020-12-09 05:12:38,029 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:37" (2/3) ... [2020-12-09 05:12:38,029 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66f4b8af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:12:38, skipping insertion in model container [2020-12-09 05:12:38,029 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:12:38" (3/3) ... [2020-12-09 05:12:38,030 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-12-09 05:12:38,040 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 05:12:38,042 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-09 05:12:38,050 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-09 05:12:38,069 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 05:12:38,069 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 05:12:38,069 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 05:12:38,069 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 05:12:38,069 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 05:12:38,069 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 05:12:38,069 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 05:12:38,069 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 05:12:38,078 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-12-09 05:12:38,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-09 05:12:38,082 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 05:12:38,082 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 05:12:38,083 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 05:12:38,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 05:12:38,087 INFO L82 PathProgramCache]: Analyzing trace with hash -731561975, now seen corresponding path program 1 times [2020-12-09 05:12:38,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 05:12:38,101 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971797185] [2020-12-09 05:12:38,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 05:12:38,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:38,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 05:12:38,229 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971797185] [2020-12-09 05:12:38,230 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 05:12:38,230 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 05:12:38,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415485414] [2020-12-09 05:12:38,233 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 05:12:38,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 05:12:38,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 05:12:38,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 05:12:38,244 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 3 states. [2020-12-09 05:12:38,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 05:12:38,277 INFO L93 Difference]: Finished difference Result 43 states and 65 transitions. [2020-12-09 05:12:38,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 05:12:38,278 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-12-09 05:12:38,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 05:12:38,284 INFO L225 Difference]: With dead ends: 43 [2020-12-09 05:12:38,284 INFO L226 Difference]: Without dead ends: 21 [2020-12-09 05:12:38,286 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 [2020-12-09 05:12:38,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-09 05:12:38,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 17. [2020-12-09 05:12:38,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-09 05:12:38,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2020-12-09 05:12:38,307 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 12 [2020-12-09 05:12:38,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 05:12:38,307 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2020-12-09 05:12:38,307 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 05:12:38,308 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2020-12-09 05:12:38,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-09 05:12:38,308 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 05:12:38,308 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 05:12:38,308 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 05:12:38,309 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 05:12:38,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 05:12:38,309 INFO L82 PathProgramCache]: Analyzing trace with hash -1445692596, now seen corresponding path program 1 times [2020-12-09 05:12:38,309 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 05:12:38,310 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391265157] [2020-12-09 05:12:38,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 05:12:38,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:38,346 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 05:12:38,346 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391265157] [2020-12-09 05:12:38,346 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2088207230] [2020-12-09 05:12:38,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/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 [2020-12-09 05:12:38,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:38,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-09 05:12:38,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:38,427 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 05:12:38,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 05:12:38,456 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 05:12:38,456 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [851803669] [2020-12-09 05:12:38,473 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-12-09 05:12:38,474 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 05:12:38,477 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 05:12:38,481 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 05:12:38,481 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 05:12:39,089 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 05:12:39,893 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 05:12:39,893 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 05:12:39,893 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2020-12-09 05:12:39,894 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645143649] [2020-12-09 05:12:39,894 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-09 05:12:39,895 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 05:12:39,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-09 05:12:39,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-12-09 05:12:39,896 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand 7 states. [2020-12-09 05:12:39,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 05:12:39,929 INFO L93 Difference]: Finished difference Result 41 states and 54 transitions. [2020-12-09 05:12:39,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 05:12:39,929 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-12-09 05:12:39,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 05:12:39,930 INFO L225 Difference]: With dead ends: 41 [2020-12-09 05:12:39,930 INFO L226 Difference]: Without dead ends: 27 [2020-12-09 05:12:39,931 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-12-09 05:12:39,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-09 05:12:39,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2020-12-09 05:12:39,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-09 05:12:39,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-12-09 05:12:39,934 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 16 [2020-12-09 05:12:39,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 05:12:39,934 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-12-09 05:12:39,934 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-09 05:12:39,934 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-12-09 05:12:39,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-09 05:12:39,935 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 05:12:39,935 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 05:12:40,136 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-09 05:12:40,137 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 05:12:40,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 05:12:40,139 INFO L82 PathProgramCache]: Analyzing trace with hash 1675646815, now seen corresponding path program 2 times [2020-12-09 05:12:40,139 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 05:12:40,140 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453470046] [2020-12-09 05:12:40,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 05:12:40,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:40,232 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-09 05:12:40,232 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453470046] [2020-12-09 05:12:40,232 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075471399] [2020-12-09 05:12:40,232 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/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 [2020-12-09 05:12:40,281 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-09 05:12:40,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 05:12:40,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 05:12:40,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:40,311 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-09 05:12:40,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 05:12:40,336 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-09 05:12:40,336 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1002845147] [2020-12-09 05:12:40,338 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-12-09 05:12:40,338 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 05:12:40,339 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 05:12:40,339 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 05:12:40,339 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 05:12:40,705 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 05:12:41,439 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 05:12:41,439 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 05:12:41,439 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 7 [2020-12-09 05:12:41,439 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472820729] [2020-12-09 05:12:41,439 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-09 05:12:41,440 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 05:12:41,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-09 05:12:41,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2020-12-09 05:12:41,440 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 8 states. [2020-12-09 05:12:41,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 05:12:41,465 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2020-12-09 05:12:41,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-09 05:12:41,465 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-12-09 05:12:41,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 05:12:41,466 INFO L225 Difference]: With dead ends: 46 [2020-12-09 05:12:41,466 INFO L226 Difference]: Without dead ends: 29 [2020-12-09 05:12:41,466 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2020-12-09 05:12:41,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-12-09 05:12:41,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2020-12-09 05:12:41,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-09 05:12:41,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-12-09 05:12:41,469 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 22 [2020-12-09 05:12:41,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 05:12:41,469 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-12-09 05:12:41,469 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-09 05:12:41,469 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-12-09 05:12:41,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-09 05:12:41,470 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 05:12:41,470 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 05:12:41,671 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 05:12:41,672 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 05:12:41,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 05:12:41,673 INFO L82 PathProgramCache]: Analyzing trace with hash 159019788, now seen corresponding path program 3 times [2020-12-09 05:12:41,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 05:12:41,674 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140199512] [2020-12-09 05:12:41,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 05:12:41,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 05:12:41,748 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 05:12:41,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 05:12:41,775 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 05:12:41,793 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-09 05:12:41,793 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 05:12:41,793 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-12-09 05:12:41,817 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 05:12:41 BoogieIcfgContainer [2020-12-09 05:12:41,817 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 05:12:41,818 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 05:12:41,818 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 05:12:41,818 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 05:12:41,818 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:12:38" (3/4) ... [2020-12-09 05:12:41,820 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-12-09 05:12:41,820 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 05:12:41,821 INFO L168 Benchmark]: Toolchain (without parser) took 4350.78 ms. Allocated memory was 100.7 MB in the beginning and 169.9 MB in the end (delta: 69.2 MB). Free memory was 57.2 MB in the beginning and 137.2 MB in the end (delta: -80.0 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 05:12:41,821 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 100.7 MB. Free memory is still 73.4 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 05:12:41,822 INFO L168 Benchmark]: CACSL2BoogieTranslator took 178.33 ms. Allocated memory is still 100.7 MB. Free memory was 57.0 MB in the beginning and 78.5 MB in the end (delta: -21.5 MB). Peak memory consumption was 5.1 MB. Max. memory is 16.1 GB. [2020-12-09 05:12:41,822 INFO L168 Benchmark]: Boogie Procedure Inliner took 34.58 ms. Allocated memory is still 100.7 MB. Free memory was 78.5 MB in the beginning and 76.8 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 05:12:41,822 INFO L168 Benchmark]: Boogie Preprocessor took 23.79 ms. Allocated memory is still 100.7 MB. Free memory was 76.8 MB in the beginning and 75.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 05:12:41,823 INFO L168 Benchmark]: RCFGBuilder took 313.88 ms. Allocated memory is still 100.7 MB. Free memory was 75.4 MB in the beginning and 51.8 MB in the end (delta: 23.7 MB). Peak memory consumption was 23.1 MB. Max. memory is 16.1 GB. [2020-12-09 05:12:41,823 INFO L168 Benchmark]: TraceAbstraction took 3792.34 ms. Allocated memory was 100.7 MB in the beginning and 169.9 MB in the end (delta: 69.2 MB). Free memory was 51.2 MB in the beginning and 137.2 MB in the end (delta: -86.0 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 05:12:41,823 INFO L168 Benchmark]: Witness Printer took 2.71 ms. Allocated memory is still 169.9 MB. Free memory is still 137.2 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 05:12:41,825 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 100.7 MB. Free memory is still 73.4 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 178.33 ms. Allocated memory is still 100.7 MB. Free memory was 57.0 MB in the beginning and 78.5 MB in the end (delta: -21.5 MB). Peak memory consumption was 5.1 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 34.58 ms. Allocated memory is still 100.7 MB. Free memory was 78.5 MB in the beginning and 76.8 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 23.79 ms. Allocated memory is still 100.7 MB. Free memory was 76.8 MB in the beginning and 75.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 313.88 ms. Allocated memory is still 100.7 MB. Free memory was 75.4 MB in the beginning and 51.8 MB in the end (delta: 23.7 MB). Peak memory consumption was 23.1 MB. Max. memory is 16.1 GB. * TraceAbstraction took 3792.34 ms. Allocated memory was 100.7 MB in the beginning and 169.9 MB in the end (delta: 69.2 MB). Free memory was 51.2 MB in the beginning and 137.2 MB in the end (delta: -86.0 MB). There was no memory consumed. Max. memory is 16.1 GB. * Witness Printer took 2.71 ms. Allocated memory is still 169.9 MB. Free memory is still 137.2 MB. There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 20]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is 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_860fca31-a163-42be-bdea-ad46b5a100c5/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 [2020-12-09 05:12:43,838 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 05:12:43,857 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 05:12:43,859 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 05:12:43,859 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 05:12:43,860 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 05:12:43,861 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/../../sv-benchmarks/c/loops/string-2.i [2020-12-09 05:12:43,901 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/data/28b50cd0e/f262669d09644bfc9865458c71216ffe/FLAG1c1881a3e [2020-12-09 05:12:44,330 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 05:12:44,331 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/sv-benchmarks/c/loops/string-2.i [2020-12-09 05:12:44,337 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/data/28b50cd0e/f262669d09644bfc9865458c71216ffe/FLAG1c1881a3e [2020-12-09 05:12:44,347 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/data/28b50cd0e/f262669d09644bfc9865458c71216ffe [2020-12-09 05:12:44,349 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 05:12:44,350 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 05:12:44,351 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 05:12:44,351 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 05:12:44,353 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 05:12:44,354 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:12:44" (1/1) ... [2020-12-09 05:12:44,355 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@188e68e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:44, skipping insertion in model container [2020-12-09 05:12:44,355 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:12:44" (1/1) ... [2020-12-09 05:12:44,360 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 05:12:44,372 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 05:12:44,464 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/sv-benchmarks/c/loops/string-2.i[896,909] [2020-12-09 05:12:44,480 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 05:12:44,487 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 05:12:44,504 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/sv-benchmarks/c/loops/string-2.i[896,909] [2020-12-09 05:12:44,521 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 05:12:44,535 INFO L208 MainTranslator]: Completed translation [2020-12-09 05:12:44,535 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:44 WrapperNode [2020-12-09 05:12:44,536 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 05:12:44,537 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 05:12:44,537 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 05:12:44,537 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 05:12:44,544 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:44" (1/1) ... [2020-12-09 05:12:44,553 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:44" (1/1) ... [2020-12-09 05:12:44,573 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 05:12:44,574 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 05:12:44,574 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 05:12:44,575 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 05:12:44,583 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:44" (1/1) ... [2020-12-09 05:12:44,583 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:44" (1/1) ... [2020-12-09 05:12:44,586 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:44" (1/1) ... [2020-12-09 05:12:44,586 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:44" (1/1) ... [2020-12-09 05:12:44,593 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:44" (1/1) ... [2020-12-09 05:12:44,598 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:44" (1/1) ... [2020-12-09 05:12:44,600 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:44" (1/1) ... [2020-12-09 05:12:44,602 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 05:12:44,603 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 05:12:44,603 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 05:12:44,603 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 05:12:44,604 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:44" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/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 [2020-12-09 05:12:44,670 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2020-12-09 05:12:44,671 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2020-12-09 05:12:44,671 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 05:12:44,671 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 05:12:44,671 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 05:12:44,672 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2020-12-09 05:12:44,672 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-09 05:12:44,974 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 05:12:44,974 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2020-12-09 05:12:44,976 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:12:44 BoogieIcfgContainer [2020-12-09 05:12:44,976 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 05:12:44,978 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 05:12:44,978 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 05:12:44,981 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 05:12:44,981 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 05:12:44" (1/3) ... [2020-12-09 05:12:44,982 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@107e4461 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:12:44, skipping insertion in model container [2020-12-09 05:12:44,982 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:12:44" (2/3) ... [2020-12-09 05:12:44,982 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@107e4461 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:12:44, skipping insertion in model container [2020-12-09 05:12:44,983 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:12:44" (3/3) ... [2020-12-09 05:12:44,984 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-12-09 05:12:44,998 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 05:12:45,001 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-09 05:12:45,011 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-09 05:12:45,034 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 05:12:45,034 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 05:12:45,034 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 05:12:45,034 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 05:12:45,034 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 05:12:45,034 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 05:12:45,035 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 05:12:45,035 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 05:12:45,046 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-12-09 05:12:45,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-09 05:12:45,051 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 05:12:45,052 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 05:12:45,052 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 05:12:45,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 05:12:45,057 INFO L82 PathProgramCache]: Analyzing trace with hash 374782792, now seen corresponding path program 1 times [2020-12-09 05:12:45,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-09 05:12:45,069 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1376169802] [2020-12-09 05:12:45,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/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 [2020-12-09 05:12:45,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:45,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 1 conjunts are in the unsatisfiable core [2020-12-09 05:12:45,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:45,172 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 05:12:45,172 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-12-09 05:12:45,173 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1376169802] [2020-12-09 05:12:45,173 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 05:12:45,173 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 05:12:45,174 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241068903] [2020-12-09 05:12:45,177 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-09 05:12:45,177 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-09 05:12:45,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-09 05:12:45,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-09 05:12:45,191 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2020-12-09 05:12:45,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 05:12:45,202 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2020-12-09 05:12:45,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-09 05:12:45,203 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 16 [2020-12-09 05:12:45,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 05:12:45,208 INFO L225 Difference]: With dead ends: 48 [2020-12-09 05:12:45,208 INFO L226 Difference]: Without dead ends: 22 [2020-12-09 05:12:45,210 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-09 05:12:45,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-09 05:12:45,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-12-09 05:12:45,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-09 05:12:45,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2020-12-09 05:12:45,231 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2020-12-09 05:12:45,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 05:12:45,231 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2020-12-09 05:12:45,232 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-09 05:12:45,232 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2020-12-09 05:12:45,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-09 05:12:45,232 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 05:12:45,232 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 05:12:45,433 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 mathsat -unsat_core_generation=3 [2020-12-09 05:12:45,435 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 05:12:45,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 05:12:45,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1602331574, now seen corresponding path program 1 times [2020-12-09 05:12:45,439 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-09 05:12:45,440 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2065059656] [2020-12-09 05:12:45,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/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 [2020-12-09 05:12:45,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:45,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 2 conjunts are in the unsatisfiable core [2020-12-09 05:12:45,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:45,642 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 05:12:45,642 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-12-09 05:12:45,643 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2065059656] [2020-12-09 05:12:45,643 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 05:12:45,643 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-09 05:12:45,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127665506] [2020-12-09 05:12:45,644 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 05:12:45,644 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-09 05:12:45,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 05:12:45,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 05:12:45,645 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand 3 states. [2020-12-09 05:12:45,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 05:12:45,690 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2020-12-09 05:12:45,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 05:12:45,690 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-12-09 05:12:45,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 05:12:45,692 INFO L225 Difference]: With dead ends: 50 [2020-12-09 05:12:45,692 INFO L226 Difference]: Without dead ends: 32 [2020-12-09 05:12:45,693 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 05:12:45,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-09 05:12:45,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2020-12-09 05:12:45,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-09 05:12:45,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-12-09 05:12:45,699 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 18 [2020-12-09 05:12:45,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 05:12:45,699 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-12-09 05:12:45,699 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 05:12:45,699 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-12-09 05:12:45,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-09 05:12:45,700 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 05:12:45,700 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, 1, 1] [2020-12-09 05:12:45,901 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 mathsat -unsat_core_generation=3 [2020-12-09 05:12:45,902 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 05:12:45,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 05:12:45,904 INFO L82 PathProgramCache]: Analyzing trace with hash 177830358, now seen corresponding path program 1 times [2020-12-09 05:12:45,906 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-09 05:12:45,907 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1694781671] [2020-12-09 05:12:45,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/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 [2020-12-09 05:12:46,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:46,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-09 05:12:46,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:46,107 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 05:12:46,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 05:12:46,133 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 05:12:46,134 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1694781671] [2020-12-09 05:12:46,134 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [370089133] [2020-12-09 05:12:46,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt [2020-12-09 05:12:46,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:46,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-09 05:12:46,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:46,204 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 05:12:46,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 05:12:46,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 05:12:46,217 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701750128] [2020-12-09 05:12:46,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/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 [2020-12-09 05:12:46,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:46,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-09 05:12:46,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:46,272 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 05:12:46,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 05:12:46,288 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 05:12:46,288 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2020-12-09 05:12:46,288 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2020-12-09 05:12:46,289 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206601604] [2020-12-09 05:12:46,289 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-09 05:12:46,290 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-09 05:12:46,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-09 05:12:46,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-12-09 05:12:46,291 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 6 states. [2020-12-09 05:12:46,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 05:12:46,441 INFO L93 Difference]: Finished difference Result 79 states and 98 transitions. [2020-12-09 05:12:46,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 05:12:46,442 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-12-09 05:12:46,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 05:12:46,443 INFO L225 Difference]: With dead ends: 79 [2020-12-09 05:12:46,443 INFO L226 Difference]: Without dead ends: 60 [2020-12-09 05:12:46,443 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-12-09 05:12:46,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-12-09 05:12:46,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 36. [2020-12-09 05:12:46,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-09 05:12:46,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-12-09 05:12:46,448 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 22 [2020-12-09 05:12:46,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 05:12:46,448 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-12-09 05:12:46,448 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-09 05:12:46,448 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-12-09 05:12:46,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-12-09 05:12:46,449 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 05:12:46,449 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 05:12:47,050 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 mathsat -unsat_core_generation=3,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,5 cvc4 --incremental --print-success --lang smt [2020-12-09 05:12:47,052 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 05:12:47,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 05:12:47,053 INFO L82 PathProgramCache]: Analyzing trace with hash -583604682, now seen corresponding path program 2 times [2020-12-09 05:12:47,054 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-09 05:12:47,054 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1583020593] [2020-12-09 05:12:47,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/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 [2020-12-09 05:12:47,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:47,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 05:12:47,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:47,175 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-09 05:12:47,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 05:12:47,267 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-09 05:12:47,267 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1583020593] [2020-12-09 05:12:47,267 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1445438157] [2020-12-09 05:12:47,267 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/cvc4 Starting monitored process 8 with cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --incremental --print-success --lang smt [2020-12-09 05:12:47,334 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2020-12-09 05:12:47,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 05:12:47,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-09 05:12:47,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:47,410 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2020-12-09 05:12:47,410 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-12-09 05:12:47,411 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2020-12-09 05:12:47,411 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7, 7] total 15 [2020-12-09 05:12:47,411 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788340312] [2020-12-09 05:12:47,411 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-09 05:12:47,412 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-09 05:12:47,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-09 05:12:47,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-12-09 05:12:47,413 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 5 states. [2020-12-09 05:12:47,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 05:12:47,464 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-12-09 05:12:47,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-09 05:12:47,465 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2020-12-09 05:12:47,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 05:12:47,466 INFO L225 Difference]: With dead ends: 48 [2020-12-09 05:12:47,466 INFO L226 Difference]: Without dead ends: 38 [2020-12-09 05:12:47,467 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2020-12-09 05:12:47,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-12-09 05:12:47,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-12-09 05:12:47,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-09 05:12:47,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-12-09 05:12:47,472 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 34 [2020-12-09 05:12:47,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 05:12:47,472 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-12-09 05:12:47,473 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-09 05:12:47,473 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-12-09 05:12:47,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-09 05:12:47,474 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 05:12:47,474 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 05:12:47,875 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 mathsat -unsat_core_generation=3,8 cvc4 --incremental --print-success --lang smt [2020-12-09 05:12:47,877 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 05:12:47,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 05:12:47,878 INFO L82 PathProgramCache]: Analyzing trace with hash 1829932657, now seen corresponding path program 1 times [2020-12-09 05:12:47,879 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-09 05:12:47,880 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1215586688] [2020-12-09 05:12:47,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/mathsat Starting monitored process 9 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with mathsat -unsat_core_generation=3 [2020-12-09 05:12:47,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:47,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 05:12:47,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:48,030 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-09 05:12:48,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 05:12:48,106 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-09 05:12:48,106 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1215586688] [2020-12-09 05:12:48,106 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1089424829] [2020-12-09 05:12:48,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/cvc4 Starting monitored process 10 with cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --incremental --print-success --lang smt [2020-12-09 05:12:48,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:48,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 05:12:48,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:48,210 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-09 05:12:48,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 05:12:48,236 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-09 05:12:48,236 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1131636284] [2020-12-09 05:12:48,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 05:12:48,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:48,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-09 05:12:48,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:48,388 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-09 05:12:48,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 05:12:48,418 INFO L398 QuantifierPusher]: Applying distributivity to a DISJUNCTION[3, 2, 2, 1] term [2020-12-09 05:12:48,418 INFO L639 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-12-09 05:12:48,503 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-12-09 05:12:48,503 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 5 imperfect interpolant sequences. [2020-12-09 05:12:48,504 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7, 7, 7, 7, 8] total 19 [2020-12-09 05:12:48,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377723551] [2020-12-09 05:12:48,504 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 05:12:48,504 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-09 05:12:48,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 05:12:48,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2020-12-09 05:12:48,505 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 4 states. [2020-12-09 05:12:48,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 05:12:48,633 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2020-12-09 05:12:48,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-09 05:12:48,633 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 36 [2020-12-09 05:12:48,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 05:12:48,634 INFO L225 Difference]: With dead ends: 43 [2020-12-09 05:12:48,634 INFO L226 Difference]: Without dead ends: 39 [2020-12-09 05:12:48,635 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 192 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2020-12-09 05:12:48,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-12-09 05:12:48,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-12-09 05:12:48,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-09 05:12:48,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2020-12-09 05:12:48,638 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 36 [2020-12-09 05:12:48,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 05:12:48,638 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2020-12-09 05:12:48,638 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 05:12:48,638 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2020-12-09 05:12:48,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-12-09 05:12:48,639 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 05:12:48,639 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 05:12:49,241 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 mathsat -unsat_core_generation=3,10 cvc4 --incremental --print-success --lang smt,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 05:12:49,243 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 05:12:49,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 05:12:49,245 INFO L82 PathProgramCache]: Analyzing trace with hash 1974004308, now seen corresponding path program 1 times [2020-12-09 05:12:49,246 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-09 05:12:49,246 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2104783124] [2020-12-09 05:12:49,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/mathsat Starting monitored process 12 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with mathsat -unsat_core_generation=3 [2020-12-09 05:12:49,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:49,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 05:12:49,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:49,344 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-12-09 05:12:49,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 05:12:49,413 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-12-09 05:12:49,414 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2104783124] [2020-12-09 05:12:49,414 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [788183120] [2020-12-09 05:12:49,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/cvc4 Starting monitored process 13 with cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --incremental --print-success --lang smt [2020-12-09 05:12:49,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:49,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 05:12:49,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:49,524 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-12-09 05:12:49,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 05:12:49,548 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-12-09 05:12:49,548 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217521439] [2020-12-09 05:12:49,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 05:12:49,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:49,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-09 05:12:49,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:49,635 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-12-09 05:12:49,635 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-12-09 05:12:49,636 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 4 imperfect interpolant sequences. [2020-12-09 05:12:49,636 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7, 7, 7, 7] total 14 [2020-12-09 05:12:49,636 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20938767] [2020-12-09 05:12:49,636 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 05:12:49,637 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-09 05:12:49,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 05:12:49,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2020-12-09 05:12:49,637 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand 4 states. [2020-12-09 05:12:49,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 05:12:49,685 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-12-09 05:12:49,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-09 05:12:49,685 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 38 [2020-12-09 05:12:49,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 05:12:49,686 INFO L225 Difference]: With dead ends: 54 [2020-12-09 05:12:49,686 INFO L226 Difference]: Without dead ends: 41 [2020-12-09 05:12:49,686 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 170 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2020-12-09 05:12:49,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-09 05:12:49,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-12-09 05:12:49,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-09 05:12:49,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2020-12-09 05:12:49,691 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 38 [2020-12-09 05:12:49,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 05:12:49,691 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2020-12-09 05:12:49,691 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 05:12:49,691 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2020-12-09 05:12:49,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-12-09 05:12:49,692 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 05:12:49,692 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 05:12:50,294 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 cvc4 --incremental --print-success --lang smt,12 mathsat -unsat_core_generation=3 [2020-12-09 05:12:50,295 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 05:12:50,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 05:12:50,296 INFO L82 PathProgramCache]: Analyzing trace with hash 420019641, now seen corresponding path program 1 times [2020-12-09 05:12:50,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-09 05:12:50,298 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [678017610] [2020-12-09 05:12:50,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/mathsat Starting monitored process 15 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with mathsat -unsat_core_generation=3 [2020-12-09 05:12:50,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:50,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 05:12:50,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:50,412 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-09 05:12:50,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 05:12:50,483 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-09 05:12:50,483 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [678017610] [2020-12-09 05:12:50,483 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [122673629] [2020-12-09 05:12:50,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/cvc4 Starting monitored process 16 with cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --incremental --print-success --lang smt [2020-12-09 05:12:50,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:50,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 05:12:50,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:50,581 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-09 05:12:50,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 05:12:50,608 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-09 05:12:50,608 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852317358] [2020-12-09 05:12:50,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 05:12:50,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 05:12:50,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 05:12:50,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 05:12:50,671 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-09 05:12:50,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 05:12:50,693 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-09 05:12:50,693 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2020-12-09 05:12:50,694 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 12 [2020-12-09 05:12:50,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528659515] [2020-12-09 05:12:50,694 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-09 05:12:50,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-09 05:12:50,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-09 05:12:50,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2020-12-09 05:12:50,695 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand 12 states. [2020-12-09 05:12:50,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 05:12:50,978 INFO L93 Difference]: Finished difference Result 102 states and 118 transitions. [2020-12-09 05:12:50,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-09 05:12:50,978 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-12-09 05:12:50,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 05:12:50,979 INFO L225 Difference]: With dead ends: 102 [2020-12-09 05:12:50,979 INFO L226 Difference]: Without dead ends: 72 [2020-12-09 05:12:50,979 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 224 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2020-12-09 05:12:50,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-12-09 05:12:50,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 45. [2020-12-09 05:12:50,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-12-09 05:12:50,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2020-12-09 05:12:50,983 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 40 [2020-12-09 05:12:50,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 05:12:50,983 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2020-12-09 05:12:50,983 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-09 05:12:50,983 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2020-12-09 05:12:50,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-12-09 05:12:50,984 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 05:12:50,984 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] [2020-12-09 05:12:51,585 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 cvc4 --incremental --print-success --lang smt,15 mathsat -unsat_core_generation=3,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 05:12:51,586 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 05:12:51,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 05:12:51,587 INFO L82 PathProgramCache]: Analyzing trace with hash -512239655, now seen corresponding path program 2 times [2020-12-09 05:12:51,588 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-09 05:12:51,589 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [992534945] [2020-12-09 05:12:51,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/mathsat Starting monitored process 18 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with mathsat -unsat_core_generation=3 [2020-12-09 05:12:51,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 05:12:51,714 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 05:12:51,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 05:12:51,801 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 05:12:51,844 INFO L173 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2020-12-09 05:12:51,844 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 05:12:52,044 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 mathsat -unsat_core_generation=3 [2020-12-09 05:12:52,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 05:12:52 BoogieIcfgContainer [2020-12-09 05:12:52,102 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 05:12:52,103 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 05:12:52,103 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 05:12:52,103 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 05:12:52,103 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:12:44" (3/4) ... [2020-12-09 05:12:52,104 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-09 05:12:52,142 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_860fca31-a163-42be-bdea-ad46b5a100c5/bin/utaipan/witness.graphml [2020-12-09 05:12:52,143 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 05:12:52,144 INFO L168 Benchmark]: Toolchain (without parser) took 7793.12 ms. Allocated memory was 58.7 MB in the beginning and 92.3 MB in the end (delta: 33.6 MB). Free memory was 40.1 MB in the beginning and 34.0 MB in the end (delta: 6.1 MB). Peak memory consumption was 38.2 MB. Max. memory is 16.1 GB. [2020-12-09 05:12:52,145 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 58.7 MB. Free memory was 41.3 MB in the beginning and 41.2 MB in the end (delta: 84.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 05:12:52,145 INFO L168 Benchmark]: CACSL2BoogieTranslator took 185.08 ms. Allocated memory is still 58.7 MB. Free memory was 40.0 MB in the beginning and 41.8 MB in the end (delta: -1.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-09 05:12:52,146 INFO L168 Benchmark]: Boogie Procedure Inliner took 37.13 ms. Allocated memory is still 58.7 MB. Free memory was 41.7 MB in the beginning and 40.0 MB in the end (delta: 1.7 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 05:12:52,146 INFO L168 Benchmark]: Boogie Preprocessor took 28.21 ms. Allocated memory is still 58.7 MB. Free memory was 40.0 MB in the beginning and 38.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 05:12:52,147 INFO L168 Benchmark]: RCFGBuilder took 372.75 ms. Allocated memory was 58.7 MB in the beginning and 75.5 MB in the end (delta: 16.8 MB). Free memory was 38.5 MB in the beginning and 53.0 MB in the end (delta: -14.5 MB). Peak memory consumption was 16.2 MB. Max. memory is 16.1 GB. [2020-12-09 05:12:52,147 INFO L168 Benchmark]: TraceAbstraction took 7124.53 ms. Allocated memory was 75.5 MB in the beginning and 92.3 MB in the end (delta: 16.8 MB). Free memory was 52.4 MB in the beginning and 38.2 MB in the end (delta: 14.1 MB). Peak memory consumption was 29.3 MB. Max. memory is 16.1 GB. [2020-12-09 05:12:52,148 INFO L168 Benchmark]: Witness Printer took 40.19 ms. Allocated memory is still 92.3 MB. Free memory was 38.2 MB in the beginning and 34.0 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-12-09 05:12:52,150 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 58.7 MB. Free memory was 41.3 MB in the beginning and 41.2 MB in the end (delta: 84.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 185.08 ms. Allocated memory is still 58.7 MB. Free memory was 40.0 MB in the beginning and 41.8 MB in the end (delta: -1.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 37.13 ms. Allocated memory is still 58.7 MB. Free memory was 41.7 MB in the beginning and 40.0 MB in the end (delta: 1.7 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 28.21 ms. Allocated memory is still 58.7 MB. Free memory was 40.0 MB in the beginning and 38.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 372.75 ms. Allocated memory was 58.7 MB in the beginning and 75.5 MB in the end (delta: 16.8 MB). Free memory was 38.5 MB in the beginning and 53.0 MB in the end (delta: -14.5 MB). Peak memory consumption was 16.2 MB. Max. memory is 16.1 GB. * TraceAbstraction took 7124.53 ms. Allocated memory was 75.5 MB in the beginning and 92.3 MB in the end (delta: 16.8 MB). Free memory was 52.4 MB in the beginning and 38.2 MB in the end (delta: 14.1 MB). Peak memory consumption was 29.3 MB. Max. memory is 16.1 GB. * Witness Printer took 40.19 ms. Allocated memory is still 92.3 MB. Free memory was 38.2 MB in the beginning and 34.0 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 20]: a call to reach_error is reachable a call to reach_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)<