./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_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:18,068 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-03 12:30:18,095 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-03 12:30:18,160 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-03 12:30:18,161 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-03 12:30:18,170 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-03 12:30:18,172 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-03 12:30:18,174 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-03 12:30:18,177 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-03 12:30:18,178 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-03 12:30:18,180 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-03 12:30:18,181 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-03 12:30:18,182 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-03 12:30:18,184 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-03 12:30:18,185 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-03 12:30:18,187 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-03 12:30:18,188 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-03 12:30:18,189 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-03 12:30:18,192 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-03 12:30:18,194 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-03 12:30:18,196 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-03 12:30:18,198 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-03 12:30:18,200 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-03 12:30:18,201 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-03 12:30:18,205 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-03 12:30:18,206 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-03 12:30:18,206 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-03 12:30:18,208 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-03 12:30:18,208 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-03 12:30:18,210 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-03 12:30:18,211 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-03 12:30:18,212 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-03 12:30:18,213 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-03 12:30:18,214 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-03 12:30:18,216 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-03 12:30:18,216 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-03 12:30:18,217 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-03 12:30:18,218 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-03 12:30:18,218 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-03 12:30:18,220 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-03 12:30:18,221 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-03 12:30:18,221 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-03 12:30:18,248 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-03 12:30:18,249 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-03 12:30:18,249 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-03 12:30:18,250 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-03 12:30:18,250 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-03 12:30:18,250 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-03 12:30:18,251 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-03 12:30:18,251 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-03 12:30:18,251 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-03 12:30:18,251 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-03 12:30:18,252 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-03 12:30:18,252 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-03 12:30:18,252 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-03 12:30:18,252 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-03 12:30:18,253 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-03 12:30:18,253 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-03 12:30:18,254 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-03 12:30:18,254 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-03 12:30:18,254 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-03 12:30:18,255 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-03 12:30:18,255 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-03 12:30:18,255 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-03 12:30:18,255 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-03 12:30:18,256 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-03 12:30:18,256 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-03 12:30:18,256 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-03 12:30:18,256 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-03 12:30:18,256 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-03 12:30:18,257 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-03 12:30:18,257 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-03 12:30:18,257 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-03 12:30:18,258 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-03 12:30:18,258 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-03 12:30:18,258 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-03 12:30:18,258 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-03 12:30:18,259 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-03 12:30:18,259 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-03 12:30:18,259 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-03 12:30:18,259 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-03 12:30:18,260 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_09d6de1e-6af6-477c-848a-f927301fb704/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 [2020-12-03 12:30:18,526 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-03 12:30:18,561 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-03 12:30:18,564 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-03 12:30:18,566 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-03 12:30:18,567 INFO L275 PluginConnector]: CDTParser initialized [2020-12-03 12:30:18,567 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/../../sv-benchmarks/c/loops/string-2.i [2020-12-03 12:30:18,670 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/data/34ca072d2/65de810123184456a32348722364b79b/FLAG3b656791a [2020-12-03 12:30:19,181 INFO L306 CDTParser]: Found 1 translation units. [2020-12-03 12:30:19,186 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/sv-benchmarks/c/loops/string-2.i [2020-12-03 12:30:19,195 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/data/34ca072d2/65de810123184456a32348722364b79b/FLAG3b656791a [2020-12-03 12:30:19,531 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/data/34ca072d2/65de810123184456a32348722364b79b [2020-12-03 12:30:19,534 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-03 12:30:19,535 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-03 12:30:19,537 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-03 12:30:19,537 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-03 12:30:19,540 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-03 12:30:19,541 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:19,542 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2732f2f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19, skipping insertion in model container [2020-12-03 12:30:19,543 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:19,549 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-03 12:30:19,578 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-03 12:30:19,711 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_09d6de1e-6af6-477c-848a-f927301fb704/sv-benchmarks/c/loops/string-2.i[896,909] [2020-12-03 12:30:19,733 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:30:19,754 INFO L203 MainTranslator]: Completed pre-run [2020-12-03 12:30:19,777 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_09d6de1e-6af6-477c-848a-f927301fb704/sv-benchmarks/c/loops/string-2.i[896,909] [2020-12-03 12:30:19,788 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:30:19,802 INFO L208 MainTranslator]: Completed translation [2020-12-03 12:30:19,803 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19 WrapperNode [2020-12-03 12:30:19,803 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-03 12:30:19,804 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-03 12:30:19,804 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-03 12:30:19,805 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-03 12:30:19,813 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:19,821 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:19,843 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-03 12:30:19,844 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-03 12:30:19,844 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-03 12:30:19,844 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-03 12:30:19,852 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:19,853 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:19,855 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:19,856 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:19,864 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:19,870 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:19,871 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:19,885 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-03 12:30:19,886 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-03 12:30:19,886 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-03 12:30:19,886 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-03 12:30:19,887 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:20,013 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-03 12:30:20,013 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-03 12:30:20,013 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-03 12:30:20,013 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-03 12:30:20,013 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-03 12:30:20,014 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-03 12:30:20,014 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-03 12:30:20,447 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-03 12:30:20,453 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2020-12-03 12:30:20,455 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:30:20 BoogieIcfgContainer [2020-12-03 12:30:20,456 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-03 12:30:20,457 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-03 12:30:20,458 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-03 12:30:20,474 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-03 12:30:20,474 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.12 12:30:19" (1/3) ... [2020-12-03 12:30:20,475 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@525fd5ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:30:20, skipping insertion in model container [2020-12-03 12:30:20,475 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (2/3) ... [2020-12-03 12:30:20,476 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@525fd5ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:30:20, skipping insertion in model container [2020-12-03 12:30:20,476 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:30:20" (3/3) ... [2020-12-03 12:30:20,477 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-12-03 12:30:20,489 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-03 12:30:20,493 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-03 12:30:20,507 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-03 12:30:20,548 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-03 12:30:20,548 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-03 12:30:20,549 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-03 12:30:20,549 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-03 12:30:20,549 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-03 12:30:20,549 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-03 12:30:20,550 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-03 12:30:20,550 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-03 12:30:20,566 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-12-03 12:30:20,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-03 12:30:20,573 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:20,573 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:30:20,611 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:20,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:20,619 INFO L82 PathProgramCache]: Analyzing trace with hash -731561975, now seen corresponding path program 1 times [2020-12-03 12:30:20,644 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:20,645 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1781331504] [2020-12-03 12:30:20,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:20,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:20,809 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:30:20,810 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1781331504] [2020-12-03 12:30:20,811 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:30:20,811 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-03 12:30:20,812 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733306428] [2020-12-03 12:30:20,816 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-03 12:30:20,816 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:20,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-03 12:30:20,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:30:20,831 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 3 states. [2020-12-03 12:30:20,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:20,876 INFO L93 Difference]: Finished difference Result 43 states and 65 transitions. [2020-12-03 12:30:20,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-03 12:30:20,878 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-12-03 12:30:20,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:20,887 INFO L225 Difference]: With dead ends: 43 [2020-12-03 12:30:20,887 INFO L226 Difference]: Without dead ends: 21 [2020-12-03 12:30:20,889 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 [2020-12-03 12:30:20,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-03 12:30:20,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 17. [2020-12-03 12:30:20,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-03 12:30:20,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2020-12-03 12:30:20,923 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 12 [2020-12-03 12:30:20,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:20,923 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2020-12-03 12:30:20,924 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-03 12:30:20,924 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2020-12-03 12:30:20,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-03 12:30:20,924 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:20,924 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:30:20,925 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-03 12:30:20,925 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:20,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:20,926 INFO L82 PathProgramCache]: Analyzing trace with hash -1445692596, now seen corresponding path program 1 times [2020-12-03 12:30:20,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:20,927 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [869364744] [2020-12-03 12:30:20,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:20,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:20,977 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-03 12:30:20,978 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [869364744] [2020-12-03 12:30:20,978 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1255787229] [2020-12-03 12:30:20,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:21,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:21,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-03 12:30:21,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:21,132 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-03 12:30:21,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:21,197 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-03 12:30:21,197 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1689591161] [2020-12-03 12:30:21,219 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-12-03 12:30:21,219 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:30:21,223 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:30:21,229 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:30:21,230 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:30:22,444 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-03 12:30:22,600 WARN L197 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 56 [2020-12-03 12:30:22,946 WARN L197 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2020-12-03 12:30:23,510 WARN L197 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 47 [2020-12-03 12:30:23,695 WARN L197 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 60 [2020-12-03 12:30:23,697 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-03 12:30:23,697 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:30:23,698 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2020-12-03 12:30:23,699 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479546370] [2020-12-03 12:30:23,701 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-03 12:30:23,701 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:23,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-03 12:30:23,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-12-03 12:30:23,707 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand 7 states. [2020-12-03 12:30:23,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:23,779 INFO L93 Difference]: Finished difference Result 41 states and 54 transitions. [2020-12-03 12:30:23,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-03 12:30:23,779 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-12-03 12:30:23,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:23,782 INFO L225 Difference]: With dead ends: 41 [2020-12-03 12:30:23,782 INFO L226 Difference]: Without dead ends: 27 [2020-12-03 12:30:23,784 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-12-03 12:30:23,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-03 12:30:23,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2020-12-03 12:30:23,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-03 12:30:23,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-12-03 12:30:23,794 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 16 [2020-12-03 12:30:23,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:23,795 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-12-03 12:30:23,805 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-03 12:30:23,806 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-12-03 12:30:23,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-03 12:30:23,807 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:23,807 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:30:24,009 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-03 12:30:24,010 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:24,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:24,010 INFO L82 PathProgramCache]: Analyzing trace with hash 1675646815, now seen corresponding path program 2 times [2020-12-03 12:30:24,011 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:24,011 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306766659] [2020-12-03 12:30:24,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:24,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:24,143 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-03 12:30:24,144 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306766659] [2020-12-03 12:30:24,145 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [890282764] [2020-12-03 12:30:24,145 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:24,247 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-03 12:30:24,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-03 12:30:24,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-03 12:30:24,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:24,297 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-03 12:30:24,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:24,343 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-03 12:30:24,344 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1920490816] [2020-12-03 12:30:24,348 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-12-03 12:30:24,349 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:30:24,349 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:30:24,349 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:30:24,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:30:24,981 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-03 12:30:25,134 WARN L197 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 56 [2020-12-03 12:30:25,265 WARN L197 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 30 [2020-12-03 12:30:25,397 WARN L197 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2020-12-03 12:30:25,539 WARN L197 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2020-12-03 12:30:26,248 WARN L197 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 60 [2020-12-03 12:30:26,248 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-03 12:30:26,249 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:30:26,249 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 7 [2020-12-03 12:30:26,249 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298797230] [2020-12-03 12:30:26,249 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-03 12:30:26,249 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:26,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-03 12:30:26,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2020-12-03 12:30:26,250 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 8 states. [2020-12-03 12:30:26,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:26,298 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2020-12-03 12:30:26,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-03 12:30:26,299 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-12-03 12:30:26,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:26,300 INFO L225 Difference]: With dead ends: 46 [2020-12-03 12:30:26,300 INFO L226 Difference]: Without dead ends: 29 [2020-12-03 12:30:26,300 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2020-12-03 12:30:26,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-12-03 12:30:26,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2020-12-03 12:30:26,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-03 12:30:26,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-12-03 12:30:26,305 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 22 [2020-12-03 12:30:26,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:26,305 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-12-03 12:30:26,305 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-03 12:30:26,305 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-12-03 12:30:26,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-03 12:30:26,306 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:26,306 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:30:26,533 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:30:26,534 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:26,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:26,534 INFO L82 PathProgramCache]: Analyzing trace with hash 159019788, now seen corresponding path program 3 times [2020-12-03 12:30:26,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:26,535 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662547529] [2020-12-03 12:30:26,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:26,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-03 12:30:26,607 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-03 12:30:26,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-03 12:30:26,677 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-03 12:30:26,707 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-03 12:30:26,708 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-03 12:30:26,708 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-12-03 12:30:26,753 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.12 12:30:26 BoogieIcfgContainer [2020-12-03 12:30:26,753 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-03 12:30:26,754 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-03 12:30:26,754 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-03 12:30:26,754 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-03 12:30:26,755 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:30:20" (3/4) ... [2020-12-03 12:30:26,757 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-12-03 12:30:26,758 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-03 12:30:26,759 INFO L168 Benchmark]: Toolchain (without parser) took 7223.35 ms. Allocated memory was 81.8 MB in the beginning and 144.7 MB in the end (delta: 62.9 MB). Free memory was 46.4 MB in the beginning and 77.8 MB in the end (delta: -31.4 MB). Peak memory consumption was 31.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:26,759 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 81.8 MB. Free memory is still 62.5 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:30:26,760 INFO L168 Benchmark]: CACSL2BoogieTranslator took 266.83 ms. Allocated memory was 81.8 MB in the beginning and 119.5 MB in the end (delta: 37.7 MB). Free memory was 46.2 MB in the beginning and 96.0 MB in the end (delta: -49.8 MB). Peak memory consumption was 3.5 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:26,760 INFO L168 Benchmark]: Boogie Procedure Inliner took 38.67 ms. Allocated memory is still 119.5 MB. Free memory was 96.0 MB in the beginning and 94.2 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:26,761 INFO L168 Benchmark]: Boogie Preprocessor took 41.80 ms. Allocated memory is still 119.5 MB. Free memory was 94.2 MB in the beginning and 92.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:26,761 INFO L168 Benchmark]: RCFGBuilder took 569.77 ms. Allocated memory is still 119.5 MB. Free memory was 92.9 MB in the beginning and 69.0 MB in the end (delta: 23.9 MB). Peak memory consumption was 23.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:26,762 INFO L168 Benchmark]: TraceAbstraction took 6295.85 ms. Allocated memory was 119.5 MB in the beginning and 144.7 MB in the end (delta: 25.2 MB). Free memory was 68.7 MB in the beginning and 77.8 MB in the end (delta: -9.1 MB). Peak memory consumption was 19.0 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:26,762 INFO L168 Benchmark]: Witness Printer took 4.18 ms. Allocated memory is still 144.7 MB. Free memory is still 77.8 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:30:26,765 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 81.8 MB. Free memory is still 62.5 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 266.83 ms. Allocated memory was 81.8 MB in the beginning and 119.5 MB in the end (delta: 37.7 MB). Free memory was 46.2 MB in the beginning and 96.0 MB in the end (delta: -49.8 MB). Peak memory consumption was 3.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 38.67 ms. Allocated memory is still 119.5 MB. Free memory was 96.0 MB in the beginning and 94.2 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 41.80 ms. Allocated memory is still 119.5 MB. Free memory was 94.2 MB in the beginning and 92.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 569.77 ms. Allocated memory is still 119.5 MB. Free memory was 92.9 MB in the beginning and 69.0 MB in the end (delta: 23.9 MB). Peak memory consumption was 23.1 MB. Max. memory is 16.1 GB. * TraceAbstraction took 6295.85 ms. Allocated memory was 119.5 MB in the beginning and 144.7 MB in the end (delta: 25.2 MB). Free memory was 68.7 MB in the beginning and 77.8 MB in the end (delta: -9.1 MB). Peak memory consumption was 19.0 MB. Max. memory is 16.1 GB. * Witness Printer took 4.18 ms. Allocated memory is still 144.7 MB. Free memory is still 77.8 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_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:29,966 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-03 12:30:29,990 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-03 12:30:29,992 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-03 12:30:29,994 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-03 12:30:29,994 INFO L275 PluginConnector]: CDTParser initialized [2020-12-03 12:30:29,996 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/../../sv-benchmarks/c/loops/string-2.i [2020-12-03 12:30:30,059 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/data/ebc2d908b/1882febe2f9c40f4a9c2fad4bfb85953/FLAG3e8f21606 [2020-12-03 12:30:30,651 INFO L306 CDTParser]: Found 1 translation units. [2020-12-03 12:30:30,652 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/sv-benchmarks/c/loops/string-2.i [2020-12-03 12:30:30,658 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/data/ebc2d908b/1882febe2f9c40f4a9c2fad4bfb85953/FLAG3e8f21606 [2020-12-03 12:30:30,975 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/data/ebc2d908b/1882febe2f9c40f4a9c2fad4bfb85953 [2020-12-03 12:30:30,977 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-03 12:30:30,978 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-03 12:30:30,979 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-03 12:30:30,980 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-03 12:30:30,983 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-03 12:30:30,984 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:30:30" (1/1) ... [2020-12-03 12:30:30,986 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@600d2147 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:30, skipping insertion in model container [2020-12-03 12:30:30,986 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:30:30" (1/1) ... [2020-12-03 12:30:31,007 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-03 12:30:31,025 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-03 12:30:31,177 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_09d6de1e-6af6-477c-848a-f927301fb704/sv-benchmarks/c/loops/string-2.i[896,909] [2020-12-03 12:30:31,220 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:30:31,239 INFO L203 MainTranslator]: Completed pre-run [2020-12-03 12:30:31,260 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_09d6de1e-6af6-477c-848a-f927301fb704/sv-benchmarks/c/loops/string-2.i[896,909] [2020-12-03 12:30:31,294 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:30:31,313 INFO L208 MainTranslator]: Completed translation [2020-12-03 12:30:31,314 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:31 WrapperNode [2020-12-03 12:30:31,315 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-03 12:30:31,316 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-03 12:30:31,316 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-03 12:30:31,316 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-03 12:30:31,324 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:31" (1/1) ... [2020-12-03 12:30:31,345 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:31" (1/1) ... [2020-12-03 12:30:31,378 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-03 12:30:31,379 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-03 12:30:31,380 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-03 12:30:31,380 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-03 12:30:31,388 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:31" (1/1) ... [2020-12-03 12:30:31,389 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:31" (1/1) ... [2020-12-03 12:30:31,398 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:31" (1/1) ... [2020-12-03 12:30:31,398 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:31" (1/1) ... [2020-12-03 12:30:31,416 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:31" (1/1) ... [2020-12-03 12:30:31,428 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:31" (1/1) ... [2020-12-03 12:30:31,430 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:31" (1/1) ... [2020-12-03 12:30:31,436 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-03 12:30:31,439 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-03 12:30:31,440 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-03 12:30:31,440 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-03 12:30:31,441 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:31" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:31,525 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2020-12-03 12:30:31,528 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2020-12-03 12:30:31,528 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-03 12:30:31,528 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-03 12:30:31,528 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-03 12:30:31,528 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2020-12-03 12:30:31,529 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-03 12:30:32,021 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-03 12:30:32,021 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2020-12-03 12:30:32,023 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:30:32 BoogieIcfgContainer [2020-12-03 12:30:32,023 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-03 12:30:32,024 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-03 12:30:32,024 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-03 12:30:32,027 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-03 12:30:32,027 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.12 12:30:30" (1/3) ... [2020-12-03 12:30:32,028 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62df3cb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:30:32, skipping insertion in model container [2020-12-03 12:30:32,028 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:31" (2/3) ... [2020-12-03 12:30:32,029 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62df3cb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:30:32, skipping insertion in model container [2020-12-03 12:30:32,029 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:30:32" (3/3) ... [2020-12-03 12:30:32,030 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-12-03 12:30:32,044 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-03 12:30:32,047 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-03 12:30:32,058 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-03 12:30:32,090 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-03 12:30:32,090 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-03 12:30:32,090 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-03 12:30:32,090 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-03 12:30:32,091 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-03 12:30:32,091 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-03 12:30:32,091 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-03 12:30:32,091 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-03 12:30:32,104 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-12-03 12:30:32,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-03 12:30:32,110 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:32,110 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:30:32,111 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:32,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:32,118 INFO L82 PathProgramCache]: Analyzing trace with hash 374782792, now seen corresponding path program 1 times [2020-12-03 12:30:32,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-03 12:30:32,132 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1268986002] [2020-12-03 12:30:32,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:32,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:32,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 1 conjunts are in the unsatisfiable core [2020-12-03 12:30:32,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:32,333 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:30:32,334 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-12-03 12:30:32,335 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1268986002] [2020-12-03 12:30:32,336 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:30:32,336 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-03 12:30:32,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014430814] [2020-12-03 12:30:32,341 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-03 12:30:32,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-03 12:30:32,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-03 12:30:32,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-03 12:30:32,358 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2020-12-03 12:30:32,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:32,376 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2020-12-03 12:30:32,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-03 12:30:32,377 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 16 [2020-12-03 12:30:32,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:32,386 INFO L225 Difference]: With dead ends: 48 [2020-12-03 12:30:32,386 INFO L226 Difference]: Without dead ends: 22 [2020-12-03 12:30:32,389 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 [2020-12-03 12:30:32,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-03 12:30:32,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-12-03 12:30:32,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-03 12:30:32,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2020-12-03 12:30:32,422 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2020-12-03 12:30:32,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:32,422 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2020-12-03 12:30:32,422 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-03 12:30:32,422 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2020-12-03 12:30:32,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-03 12:30:32,426 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:32,426 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:30:32,627 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 mathsat -unsat_core_generation=3 [2020-12-03 12:30:32,627 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:32,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:32,628 INFO L82 PathProgramCache]: Analyzing trace with hash 1602331574, now seen corresponding path program 1 times [2020-12-03 12:30:32,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-03 12:30:32,629 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [169045302] [2020-12-03 12:30:32,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:32,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:32,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 2 conjunts are in the unsatisfiable core [2020-12-03 12:30:32,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:32,746 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:30:32,747 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-12-03 12:30:32,747 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [169045302] [2020-12-03 12:30:32,747 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:30:32,748 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-03 12:30:32,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082449354] [2020-12-03 12:30:32,749 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-03 12:30:32,749 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-03 12:30:32,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-03 12:30:32,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:30:32,751 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand 3 states. [2020-12-03 12:30:32,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:32,853 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2020-12-03 12:30:32,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-03 12:30:32,855 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-12-03 12:30:32,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:32,857 INFO L225 Difference]: With dead ends: 50 [2020-12-03 12:30:32,857 INFO L226 Difference]: Without dead ends: 32 [2020-12-03 12:30:32,858 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 [2020-12-03 12:30:32,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-03 12:30:32,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2020-12-03 12:30:32,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-03 12:30:32,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-12-03 12:30:32,874 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 18 [2020-12-03 12:30:32,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:32,876 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-12-03 12:30:32,879 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-03 12:30:32,879 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-12-03 12:30:32,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-03 12:30:32,880 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:32,881 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] [2020-12-03 12:30:33,092 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 mathsat -unsat_core_generation=3 [2020-12-03 12:30:33,092 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:33,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:33,093 INFO L82 PathProgramCache]: Analyzing trace with hash 177830358, now seen corresponding path program 1 times [2020-12-03 12:30:33,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-03 12:30:33,094 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [635914671] [2020-12-03 12:30:33,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:33,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:33,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-03 12:30:33,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:33,207 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-03 12:30:33,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:33,258 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-03 12:30:33,258 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [635914671] [2020-12-03 12:30:33,258 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [313485735] [2020-12-03 12:30:33,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:33,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:33,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-03 12:30:33,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:33,439 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-03 12:30:33,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:33,494 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-03 12:30:33,495 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900569512] [2020-12-03 12:30:33,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:33,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:33,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-03 12:30:33,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:33,609 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-03 12:30:33,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:33,663 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-03 12:30:33,663 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2020-12-03 12:30:33,663 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2020-12-03 12:30:33,664 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479322734] [2020-12-03 12:30:33,664 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-03 12:30:33,665 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-03 12:30:33,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-03 12:30:33,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-12-03 12:30:33,666 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 6 states. [2020-12-03 12:30:33,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:33,932 INFO L93 Difference]: Finished difference Result 79 states and 98 transitions. [2020-12-03 12:30:33,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-03 12:30:33,934 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-12-03 12:30:33,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:33,935 INFO L225 Difference]: With dead ends: 79 [2020-12-03 12:30:33,935 INFO L226 Difference]: Without dead ends: 60 [2020-12-03 12:30:33,936 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 [2020-12-03 12:30:33,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-12-03 12:30:33,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 36. [2020-12-03 12:30:33,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-03 12:30:33,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-12-03 12:30:33,951 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 22 [2020-12-03 12:30:33,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:33,952 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-12-03 12:30:33,952 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-03 12:30:33,952 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-12-03 12:30:33,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-12-03 12:30:33,954 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:33,955 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] [2020-12-03 12:30:34,556 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 [2020-12-03 12:30:34,557 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:34,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:34,557 INFO L82 PathProgramCache]: Analyzing trace with hash -583604682, now seen corresponding path program 2 times [2020-12-03 12:30:34,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-03 12:30:34,558 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [121614698] [2020-12-03 12:30:34,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:34,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:34,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-03 12:30:34,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:34,715 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-03 12:30:34,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:34,863 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-03 12:30:34,864 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [121614698] [2020-12-03 12:30:34,864 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1805291861] [2020-12-03 12:30:34,864 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:34,980 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2020-12-03 12:30:34,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-03 12:30:34,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-03 12:30:34,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:35,105 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2020-12-03 12:30:35,105 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-12-03 12:30:35,105 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2020-12-03 12:30:35,105 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7, 7] total 15 [2020-12-03 12:30:35,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395342989] [2020-12-03 12:30:35,106 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-03 12:30:35,106 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-03 12:30:35,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-03 12:30:35,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-12-03 12:30:35,108 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 5 states. [2020-12-03 12:30:35,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:35,188 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-12-03 12:30:35,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-03 12:30:35,188 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2020-12-03 12:30:35,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:35,190 INFO L225 Difference]: With dead ends: 48 [2020-12-03 12:30:35,190 INFO L226 Difference]: Without dead ends: 38 [2020-12-03 12:30:35,190 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2020-12-03 12:30:35,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-12-03 12:30:35,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-12-03 12:30:35,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-03 12:30:35,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-12-03 12:30:35,196 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 34 [2020-12-03 12:30:35,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:35,197 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-12-03 12:30:35,197 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-03 12:30:35,197 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-12-03 12:30:35,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-03 12:30:35,198 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:35,199 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] [2020-12-03 12:30:35,599 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 mathsat -unsat_core_generation=3,8 cvc4 --incremental --print-success --lang smt [2020-12-03 12:30:35,600 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:35,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:35,600 INFO L82 PathProgramCache]: Analyzing trace with hash 1829932657, now seen corresponding path program 1 times [2020-12-03 12:30:35,600 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-03 12:30:35,601 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1130479838] [2020-12-03 12:30:35,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:35,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:35,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-03 12:30:35,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:35,747 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-03 12:30:35,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:35,912 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-03 12:30:35,913 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1130479838] [2020-12-03 12:30:35,913 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1492545954] [2020-12-03 12:30:35,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:36,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:36,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-03 12:30:36,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:36,089 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-03 12:30:36,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:36,151 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-03 12:30:36,152 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710258701] [2020-12-03 12:30:36,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:36,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:36,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-03 12:30:36,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:36,436 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-03 12:30:36,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:36,493 INFO L398 QuantifierPusher]: Applying distributivity to a DISJUNCTION[3, 2, 2, 1] term [2020-12-03 12:30:36,494 INFO L639 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-12-03 12:30:36,634 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-12-03 12:30:36,634 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 5 imperfect interpolant sequences. [2020-12-03 12:30:36,635 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7, 7, 7, 7, 8] total 19 [2020-12-03 12:30:36,635 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355022078] [2020-12-03 12:30:36,635 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-03 12:30:36,636 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-03 12:30:36,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-03 12:30:36,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2020-12-03 12:30:36,637 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 4 states. [2020-12-03 12:30:36,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:36,830 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2020-12-03 12:30:36,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-03 12:30:36,832 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 36 [2020-12-03 12:30:36,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:36,832 INFO L225 Difference]: With dead ends: 43 [2020-12-03 12:30:36,833 INFO L226 Difference]: Without dead ends: 39 [2020-12-03 12:30:36,833 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 192 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2020-12-03 12:30:36,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-12-03 12:30:36,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-12-03 12:30:36,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-03 12:30:36,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2020-12-03 12:30:36,839 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 36 [2020-12-03 12:30:36,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:36,839 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2020-12-03 12:30:36,839 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-03 12:30:36,840 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2020-12-03 12:30:36,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-12-03 12:30:36,841 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:36,841 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] [2020-12-03 12:30:37,456 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 [2020-12-03 12:30:37,456 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:37,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:37,457 INFO L82 PathProgramCache]: Analyzing trace with hash 1974004308, now seen corresponding path program 1 times [2020-12-03 12:30:37,457 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-03 12:30:37,458 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1370283158] [2020-12-03 12:30:37,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:37,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:37,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-03 12:30:37,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:37,634 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-12-03 12:30:37,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:37,751 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-12-03 12:30:37,752 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1370283158] [2020-12-03 12:30:37,752 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1497099482] [2020-12-03 12:30:37,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:37,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:37,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-03 12:30:37,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:38,005 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-12-03 12:30:38,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:38,063 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-12-03 12:30:38,064 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2136521554] [2020-12-03 12:30:38,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:38,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:38,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-03 12:30:38,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:38,227 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-12-03 12:30:38,227 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-12-03 12:30:38,227 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 4 imperfect interpolant sequences. [2020-12-03 12:30:38,228 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7, 7, 7, 7] total 14 [2020-12-03 12:30:38,228 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592002106] [2020-12-03 12:30:38,229 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-03 12:30:38,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-03 12:30:38,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-03 12:30:38,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2020-12-03 12:30:38,231 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand 4 states. [2020-12-03 12:30:38,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:38,303 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-12-03 12:30:38,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-03 12:30:38,304 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 38 [2020-12-03 12:30:38,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:38,309 INFO L225 Difference]: With dead ends: 54 [2020-12-03 12:30:38,309 INFO L226 Difference]: Without dead ends: 41 [2020-12-03 12:30:38,310 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 170 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2020-12-03 12:30:38,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-03 12:30:38,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-12-03 12:30:38,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-03 12:30:38,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2020-12-03 12:30:38,325 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 38 [2020-12-03 12:30:38,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:38,327 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2020-12-03 12:30:38,327 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-03 12:30:38,327 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2020-12-03 12:30:38,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-12-03 12:30:38,328 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:38,329 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] [2020-12-03 12:30:38,958 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 [2020-12-03 12:30:38,958 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:38,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:38,958 INFO L82 PathProgramCache]: Analyzing trace with hash 420019641, now seen corresponding path program 1 times [2020-12-03 12:30:38,959 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-03 12:30:38,959 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1513493107] [2020-12-03 12:30:38,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:39,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:39,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-03 12:30:39,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:39,116 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-03 12:30:39,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:39,230 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-03 12:30:39,230 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1513493107] [2020-12-03 12:30:39,230 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1502386789] [2020-12-03 12:30:39,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:39,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:39,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-03 12:30:39,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:39,412 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-03 12:30:39,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:39,454 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-03 12:30:39,454 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289087881] [2020-12-03 12:30:39,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:39,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:39,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-03 12:30:39,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:39,570 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-03 12:30:39,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:39,613 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-03 12:30:39,613 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2020-12-03 12:30:39,614 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 12 [2020-12-03 12:30:39,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008802346] [2020-12-03 12:30:39,615 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-03 12:30:39,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-03 12:30:39,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-03 12:30:39,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2020-12-03 12:30:39,617 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand 12 states. [2020-12-03 12:30:40,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:40,018 INFO L93 Difference]: Finished difference Result 102 states and 118 transitions. [2020-12-03 12:30:40,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-03 12:30:40,019 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-12-03 12:30:40,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:40,020 INFO L225 Difference]: With dead ends: 102 [2020-12-03 12:30:40,020 INFO L226 Difference]: Without dead ends: 72 [2020-12-03 12:30:40,021 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 224 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2020-12-03 12:30:40,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-12-03 12:30:40,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 45. [2020-12-03 12:30:40,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-12-03 12:30:40,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2020-12-03 12:30:40,026 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 40 [2020-12-03 12:30:40,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:40,027 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2020-12-03 12:30:40,027 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-03 12:30:40,027 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2020-12-03 12:30:40,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-12-03 12:30:40,028 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:40,028 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] [2020-12-03 12:30:40,631 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 [2020-12-03 12:30:40,631 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:40,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:40,632 INFO L82 PathProgramCache]: Analyzing trace with hash -512239655, now seen corresponding path program 2 times [2020-12-03 12:30:40,632 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-03 12:30:40,633 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1519569371] [2020-12-03 12:30:40,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/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 [2020-12-03 12:30:40,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-03 12:30:40,813 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-03 12:30:40,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-03 12:30:40,935 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-03 12:30:40,995 INFO L173 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2020-12-03 12:30:40,995 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-03 12:30:41,214 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 mathsat -unsat_core_generation=3 [2020-12-03 12:30:41,269 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.12 12:30:41 BoogieIcfgContainer [2020-12-03 12:30:41,281 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-03 12:30:41,282 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-03 12:30:41,282 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-03 12:30:41,282 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-03 12:30:41,282 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:30:32" (3/4) ... [2020-12-03 12:30:41,285 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-03 12:30:41,404 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_09d6de1e-6af6-477c-848a-f927301fb704/bin/utaipan/witness.graphml [2020-12-03 12:30:41,404 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-03 12:30:41,406 INFO L168 Benchmark]: Toolchain (without parser) took 10426.85 ms. Allocated memory was 69.2 MB in the beginning and 100.7 MB in the end (delta: 31.5 MB). Free memory was 51.3 MB in the beginning and 78.8 MB in the end (delta: -27.5 MB). Peak memory consumption was 58.6 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:41,410 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 69.2 MB. Free memory is still 50.6 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:30:41,410 INFO L168 Benchmark]: CACSL2BoogieTranslator took 335.76 ms. Allocated memory is still 69.2 MB. Free memory was 51.2 MB in the beginning and 40.2 MB in the end (delta: 11.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:41,412 INFO L168 Benchmark]: Boogie Procedure Inliner took 62.17 ms. Allocated memory is still 69.2 MB. Free memory was 40.2 MB in the beginning and 38.6 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:41,413 INFO L168 Benchmark]: Boogie Preprocessor took 58.72 ms. Allocated memory is still 69.2 MB. Free memory was 38.6 MB in the beginning and 37.1 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:41,413 INFO L168 Benchmark]: RCFGBuilder took 584.09 ms. Allocated memory is still 69.2 MB. Free memory was 37.1 MB in the beginning and 40.4 MB in the end (delta: -3.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:41,414 INFO L168 Benchmark]: TraceAbstraction took 9256.67 ms. Allocated memory was 69.2 MB in the beginning and 100.7 MB in the end (delta: 31.5 MB). Free memory was 39.9 MB in the beginning and 28.1 MB in the end (delta: 11.9 MB). Peak memory consumption was 43.9 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:41,414 INFO L168 Benchmark]: Witness Printer took 122.93 ms. Allocated memory is still 100.7 MB. Free memory was 28.1 MB in the beginning and 78.8 MB in the end (delta: -50.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:41,416 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 69.2 MB. Free memory is still 50.6 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 335.76 ms. Allocated memory is still 69.2 MB. Free memory was 51.2 MB in the beginning and 40.2 MB in the end (delta: 11.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 62.17 ms. Allocated memory is still 69.2 MB. Free memory was 40.2 MB in the beginning and 38.6 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 58.72 ms. Allocated memory is still 69.2 MB. Free memory was 38.6 MB in the beginning and 37.1 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 584.09 ms. Allocated memory is still 69.2 MB. Free memory was 37.1 MB in the beginning and 40.4 MB in the end (delta: -3.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 9256.67 ms. Allocated memory was 69.2 MB in the beginning and 100.7 MB in the end (delta: 31.5 MB). Free memory was 39.9 MB in the beginning and 28.1 MB in the end (delta: 11.9 MB). Peak memory consumption was 43.9 MB. Max. memory is 16.1 GB. * Witness Printer took 122.93 ms. Allocated memory is still 100.7 MB. Free memory was 28.1 MB in the beginning and 78.8 MB in the end (delta: -50.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 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)<