./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_sentinel-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_sentinel-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7 --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 590a845a219659d0ad58521e10c3551f2ec7e80ca70e994a8616abe765f6f296 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:33:21,729 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:33:21,731 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:33:21,763 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:33:21,764 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:33:21,765 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:33:21,767 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:33:21,769 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:33:21,771 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:33:21,772 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:33:21,773 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:33:21,774 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:33:21,775 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:33:21,776 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:33:21,777 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:33:21,779 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:33:21,780 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:33:21,781 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:33:21,783 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:33:21,785 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:33:21,787 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:33:21,795 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:33:21,796 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:33:21,797 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:33:21,800 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:33:21,801 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:33:21,801 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:33:21,802 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:33:21,803 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:33:21,804 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:33:21,805 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:33:21,805 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:33:21,806 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:33:21,807 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:33:21,808 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:33:21,809 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:33:21,817 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:33:21,818 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:33:21,818 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:33:21,819 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:33:21,819 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:33:21,820 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:33:21,866 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:33:21,866 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:33:21,867 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:33:21,867 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:33:21,867 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:33:21,867 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:33:21,868 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:33:21,868 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:33:21,868 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:33:21,868 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:33:21,868 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:33:21,869 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:33:21,869 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:33:21,869 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:33:21,869 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:33:21,869 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:33:21,870 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:33:21,870 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:33:21,870 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:33:21,871 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:33:21,871 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:33:21,871 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:33:21,871 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:33:21,871 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:33:21,872 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:33:21,872 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:33:21,872 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:33:21,872 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:33:21,872 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:33:21,872 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:33:21,873 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:33:21,873 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:33:21,873 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:33:21,873 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:33:21,874 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:33:21,874 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:33:21,874 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:33:21,874 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:33:21,874 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:33:21,874 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:33:21,875 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:33:21,875 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_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 590a845a219659d0ad58521e10c3551f2ec7e80ca70e994a8616abe765f6f296 [2021-11-25 20:33:22,117 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:33:22,145 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:33:22,148 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:33:22,149 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:33:22,150 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:33:22,151 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-examples/standard_sentinel-2.i [2021-11-25 20:33:22,229 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/data/59bae89d7/36e87975320a4a66be38a9c6486270dd/FLAG27725b6ca [2021-11-25 20:33:22,636 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:33:22,636 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/sv-benchmarks/c/array-examples/standard_sentinel-2.i [2021-11-25 20:33:22,642 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/data/59bae89d7/36e87975320a4a66be38a9c6486270dd/FLAG27725b6ca [2021-11-25 20:33:23,049 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/data/59bae89d7/36e87975320a4a66be38a9c6486270dd [2021-11-25 20:33:23,051 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:33:23,052 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:33:23,054 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:33:23,054 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:33:23,058 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:33:23,058 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:33:23" (1/1) ... [2021-11-25 20:33:23,059 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2bce4211 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:33:23, skipping insertion in model container [2021-11-25 20:33:23,059 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:33:23" (1/1) ... [2021-11-25 20:33:23,065 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:33:23,078 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:33:23,237 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/sv-benchmarks/c/array-examples/standard_sentinel-2.i[852,865] [2021-11-25 20:33:23,259 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:33:23,264 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:33:23,275 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/sv-benchmarks/c/array-examples/standard_sentinel-2.i[852,865] [2021-11-25 20:33:23,280 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:33:23,293 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:33:23,294 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:33:23 WrapperNode [2021-11-25 20:33:23,294 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:33:23,295 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:33:23,295 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:33:23,295 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:33:23,303 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:33:23" (1/1) ... [2021-11-25 20:33:23,310 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:33:23" (1/1) ... [2021-11-25 20:33:23,328 INFO L137 Inliner]: procedures = 16, calls = 13, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 50 [2021-11-25 20:33:23,329 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:33:23,330 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:33:23,330 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:33:23,330 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:33:23,338 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:33:23" (1/1) ... [2021-11-25 20:33:23,338 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:33:23" (1/1) ... [2021-11-25 20:33:23,340 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:33:23" (1/1) ... [2021-11-25 20:33:23,340 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:33:23" (1/1) ... [2021-11-25 20:33:23,345 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:33:23" (1/1) ... [2021-11-25 20:33:23,349 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:33:23" (1/1) ... [2021-11-25 20:33:23,350 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:33:23" (1/1) ... [2021-11-25 20:33:23,352 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:33:23,353 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:33:23,353 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:33:23,353 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:33:23,354 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:33:23" (1/1) ... [2021-11-25 20:33:23,362 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:33:23,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:23,403 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:33:23,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:33:23,449 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:33:23,449 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:33:23,449 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 20:33:23,449 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 20:33:23,450 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:33:23,450 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:33:23,450 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 20:33:23,450 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 20:33:23,520 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:33:23,522 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:33:23,634 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:33:23,654 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:33:23,654 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 20:33:23,656 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:33:23 BoogieIcfgContainer [2021-11-25 20:33:23,657 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:33:23,659 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:33:23,659 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:33:23,663 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:33:23,663 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:33:23" (1/3) ... [2021-11-25 20:33:23,664 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@574955df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:33:23, skipping insertion in model container [2021-11-25 20:33:23,664 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:33:23" (2/3) ... [2021-11-25 20:33:23,665 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@574955df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:33:23, skipping insertion in model container [2021-11-25 20:33:23,665 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:33:23" (3/3) ... [2021-11-25 20:33:23,666 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_sentinel-2.i [2021-11-25 20:33:23,671 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:33:23,672 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:33:23,717 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:33:23,724 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 20:33:23,724 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:33:23,739 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:23,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 20:33:23,751 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:23,751 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:23,752 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:23,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:23,758 INFO L85 PathProgramCache]: Analyzing trace with hash -2083082669, now seen corresponding path program 1 times [2021-11-25 20:33:23,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:23,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698933156] [2021-11-25 20:33:23,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:23,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:23,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:23,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:33:23,919 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:23,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698933156] [2021-11-25 20:33:23,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1698933156] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:33:23,920 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:33:23,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:33:23,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756703268] [2021-11-25 20:33:23,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:33:23,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:33:23,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:23,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:33:23,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:33:23,958 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:24,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:24,017 INFO L93 Difference]: Finished difference Result 23 states and 31 transitions. [2021-11-25 20:33:24,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:33:24,019 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 20:33:24,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:24,041 INFO L225 Difference]: With dead ends: 23 [2021-11-25 20:33:24,041 INFO L226 Difference]: Without dead ends: 10 [2021-11-25 20:33:24,044 INFO L932 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 [2021-11-25 20:33:24,048 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:24,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:33:24,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-25 20:33:24,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-11-25 20:33:24,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:24,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-11-25 20:33:24,135 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 7 [2021-11-25 20:33:24,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:24,135 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-11-25 20:33:24,136 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:24,136 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-11-25 20:33:24,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 20:33:24,137 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:24,137 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:24,137 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:33:24,138 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:24,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:24,139 INFO L85 PathProgramCache]: Analyzing trace with hash -1530730876, now seen corresponding path program 1 times [2021-11-25 20:33:24,139 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:24,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003520259] [2021-11-25 20:33:24,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:24,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:24,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:24,252 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:33:24,252 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:24,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003520259] [2021-11-25 20:33:24,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2003520259] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:24,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1741430745] [2021-11-25 20:33:24,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:24,254 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:24,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:24,258 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:24,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:33:24,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:24,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:33:24,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:24,380 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:33:24,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:24,416 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:33:24,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1741430745] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:24,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [967417336] [2021-11-25 20:33:24,449 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:33:24,449 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:24,459 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:24,465 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:24,466 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:24,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:24,643 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:33:24,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:33:24,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:24,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:33:24,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:24,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:33:24,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:24,908 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:24,938 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:33:24,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2021-11-25 20:33:25,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:25,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:33:25,270 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:25,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [967417336] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:33:25,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:25,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 11 [2021-11-25 20:33:25,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142355541] [2021-11-25 20:33:25,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:33:25,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:33:25,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:25,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:33:25,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2021-11-25 20:33:25,532 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:25,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:25,576 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2021-11-25 20:33:25,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:33:25,576 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 20:33:25,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:25,577 INFO L225 Difference]: With dead ends: 16 [2021-11-25 20:33:25,577 INFO L226 Difference]: Without dead ends: 12 [2021-11-25 20:33:25,578 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2021-11-25 20:33:25,579 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 13 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:25,580 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 4 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:33:25,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-25 20:33:25,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-25 20:33:25,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:25,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-11-25 20:33:25,584 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 9 [2021-11-25 20:33:25,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:25,585 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-11-25 20:33:25,585 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:25,585 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-11-25 20:33:25,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 20:33:25,586 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:25,586 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:25,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:25,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:25,810 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:25,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:25,810 INFO L85 PathProgramCache]: Analyzing trace with hash -2104881793, now seen corresponding path program 1 times [2021-11-25 20:33:25,811 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:25,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210132242] [2021-11-25 20:33:25,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:25,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:25,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:25,878 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:33:25,879 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:25,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210132242] [2021-11-25 20:33:25,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1210132242] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:25,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378362930] [2021-11-25 20:33:25,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:25,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:25,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:25,881 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:25,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:33:25,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:25,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:33:25,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:25,949 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:33:25,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:25,983 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:33:25,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1378362930] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:25,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1445529754] [2021-11-25 20:33:25,987 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:33:25,987 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:25,987 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:25,988 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:25,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:26,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:26,026 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:33:26,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:33:26,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:26,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:33:26,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:26,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:33:26,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:26,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:26,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:26,161 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:33:26,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-25 20:33:26,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:26,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:33:26,324 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:26,590 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '222#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~marker~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start_main_~pos~0#1| 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~pos~0#1|) (= (ite (<= |ULTIMATE.start_main_~i~1#1| |ULTIMATE.start_main_~pos~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~marker~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_main_~marker~0#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:26,590 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:26,591 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:26,591 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2021-11-25 20:33:26,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41628642] [2021-11-25 20:33:26,591 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:26,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:33:26,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:26,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:33:26,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:33:26,593 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:26,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:26,608 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-11-25 20:33:26,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:33:26,609 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 20:33:26,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:26,609 INFO L225 Difference]: With dead ends: 24 [2021-11-25 20:33:26,609 INFO L226 Difference]: Without dead ends: 15 [2021-11-25 20:33:26,610 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:33:26,611 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:26,612 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:33:26,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-25 20:33:26,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-25 20:33:26,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:26,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-11-25 20:33:26,617 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-11-25 20:33:26,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:26,617 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-11-25 20:33:26,617 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:26,618 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-11-25 20:33:26,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 20:33:26,618 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:26,619 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:26,652 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:26,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:26,834 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:26,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:26,835 INFO L85 PathProgramCache]: Analyzing trace with hash -1572801813, now seen corresponding path program 2 times [2021-11-25 20:33:26,835 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:26,835 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1905439056] [2021-11-25 20:33:26,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:26,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:26,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:26,955 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:33:26,956 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:26,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1905439056] [2021-11-25 20:33:26,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1905439056] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:26,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [751013056] [2021-11-25 20:33:26,956 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:33:26,957 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:26,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:26,958 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:26,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:33:27,012 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:33:27,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:33:27,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 20:33:27,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:27,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:33:27,078 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:33:27,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 23 [2021-11-25 20:33:27,209 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:33:27,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:27,314 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:33:27,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [751013056] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:27,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [331704608] [2021-11-25 20:33:27,317 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:33:27,318 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:27,318 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:27,318 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:27,319 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:27,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:27,366 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:33:27,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:33:27,378 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:27,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:33:27,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:27,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:33:27,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:27,475 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:27,500 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:33:27,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2021-11-25 20:33:27,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:27,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:33:27,707 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:28,011 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '376#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~marker~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start_main_~pos~0#1| 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~pos~0#1|) (= (ite (<= |ULTIMATE.start_main_~i~1#1| |ULTIMATE.start_main_~pos~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~marker~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_main_~marker~0#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:28,011 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:28,011 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:28,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 14 [2021-11-25 20:33:28,011 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853010546] [2021-11-25 20:33:28,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:28,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:33:28,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:28,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:33:28,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2021-11-25 20:33:28,013 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:28,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:28,208 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-11-25 20:33:28,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 20:33:28,209 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 20:33:28,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:28,210 INFO L225 Difference]: With dead ends: 33 [2021-11-25 20:33:28,210 INFO L226 Difference]: Without dead ends: 20 [2021-11-25 20:33:28,211 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=538, Unknown=0, NotChecked=0, Total=650 [2021-11-25 20:33:28,212 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:28,212 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 23 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:33:28,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-25 20:33:28,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-25 20:33:28,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:28,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-25 20:33:28,217 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 14 [2021-11-25 20:33:28,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:28,221 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-25 20:33:28,221 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:28,221 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-25 20:33:28,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 20:33:28,223 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:28,223 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:28,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:28,438 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:28,438 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:28,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:28,438 INFO L85 PathProgramCache]: Analyzing trace with hash 534146613, now seen corresponding path program 3 times [2021-11-25 20:33:28,439 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:28,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [288549968] [2021-11-25 20:33:28,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:28,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:28,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:28,520 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:33:28,520 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:28,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [288549968] [2021-11-25 20:33:28,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [288549968] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:28,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101540405] [2021-11-25 20:33:28,521 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:33:28,522 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:28,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:28,523 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:28,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:33:28,583 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:33:28,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:33:28,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 20:33:28,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:28,624 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:33:28,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:28,729 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:33:28,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101540405] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:28,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1408380706] [2021-11-25 20:33:28,734 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:33:28,734 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:28,735 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:28,735 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:28,735 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:28,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:28,767 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:33:28,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:33:28,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:28,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:33:28,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:28,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:33:28,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:28,878 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:28,905 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:33:28,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2021-11-25 20:33:28,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:29,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:33:29,074 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:29,332 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '590#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~marker~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start_main_~pos~0#1| 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~pos~0#1|) (= (ite (<= |ULTIMATE.start_main_~i~1#1| |ULTIMATE.start_main_~pos~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~marker~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_main_~marker~0#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:29,332 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:29,333 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:29,333 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2021-11-25 20:33:29,333 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713140310] [2021-11-25 20:33:29,333 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:29,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:33:29,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:29,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:33:29,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=297, Unknown=0, NotChecked=0, Total=420 [2021-11-25 20:33:29,335 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 14 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:29,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:29,369 INFO L93 Difference]: Finished difference Result 40 states and 48 transitions. [2021-11-25 20:33:29,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 20:33:29,369 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-25 20:33:29,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:29,370 INFO L225 Difference]: With dead ends: 40 [2021-11-25 20:33:29,370 INFO L226 Difference]: Without dead ends: 27 [2021-11-25 20:33:29,371 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=123, Invalid=297, Unknown=0, NotChecked=0, Total=420 [2021-11-25 20:33:29,372 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:29,372 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:33:29,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-25 20:33:29,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-25 20:33:29,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:29,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-11-25 20:33:29,379 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 19 [2021-11-25 20:33:29,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:29,379 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-11-25 20:33:29,379 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:29,380 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-11-25 20:33:29,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 20:33:29,380 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:29,382 INFO L514 BasicCegarLoop]: trace histogram [12, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:29,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:29,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:29,600 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:29,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:29,600 INFO L85 PathProgramCache]: Analyzing trace with hash -1218646879, now seen corresponding path program 4 times [2021-11-25 20:33:29,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:29,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112354054] [2021-11-25 20:33:29,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:29,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:29,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:29,775 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:33:29,776 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:29,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112354054] [2021-11-25 20:33:29,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112354054] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:29,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522712749] [2021-11-25 20:33:29,776 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:33:29,777 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:29,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:29,778 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:29,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:33:29,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:29,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:33:29,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:29,912 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:33:29,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:30,217 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:33:30,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1522712749] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:30,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [647424263] [2021-11-25 20:33:30,219 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:33:30,219 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:30,220 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:30,220 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:30,220 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:30,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:30,250 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:33:30,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 20:33:30,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:30,272 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:33:30,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:33:30,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:30,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:33:30,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:30,352 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:30,374 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:33:30,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2021-11-25 20:33:30,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:30,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:33:30,569 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:30,847 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '880#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~marker~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start_main_~pos~0#1| 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~pos~0#1|) (= (ite (<= |ULTIMATE.start_main_~i~1#1| |ULTIMATE.start_main_~pos~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~marker~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_main_~marker~0#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:30,848 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:30,848 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:30,848 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2021-11-25 20:33:30,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815320096] [2021-11-25 20:33:30,848 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:30,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 20:33:30,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:30,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 20:33:30,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=410, Invalid=780, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 20:33:30,850 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:30,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:30,919 INFO L93 Difference]: Finished difference Result 54 states and 69 transitions. [2021-11-25 20:33:30,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 20:33:30,919 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-25 20:33:30,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:30,921 INFO L225 Difference]: With dead ends: 54 [2021-11-25 20:33:30,922 INFO L226 Difference]: Without dead ends: 41 [2021-11-25 20:33:30,926 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 262 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=410, Invalid=780, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 20:33:30,929 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:30,929 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 49 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:33:30,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-25 20:33:30,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-25 20:33:30,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.05) internal successors, (42), 40 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:30,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2021-11-25 20:33:30,944 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 26 [2021-11-25 20:33:30,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:30,945 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2021-11-25 20:33:30,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:30,945 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2021-11-25 20:33:30,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 20:33:30,947 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:30,947 INFO L514 BasicCegarLoop]: trace histogram [26, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:30,988 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:31,161 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:31,162 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:31,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:31,162 INFO L85 PathProgramCache]: Analyzing trace with hash 1074687521, now seen corresponding path program 5 times [2021-11-25 20:33:31,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:31,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959078768] [2021-11-25 20:33:31,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:31,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:31,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:31,619 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:33:31,620 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:31,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959078768] [2021-11-25 20:33:31,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959078768] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:31,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147968757] [2021-11-25 20:33:31,620 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:33:31,620 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:31,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:31,626 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:31,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:33:31,716 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:33:31,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:33:31,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 20:33:31,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:31,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:33:32,037 INFO L354 Elim1Store]: treesize reduction 39, result has 55.7 percent of original size [2021-11-25 20:33:32,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 44 treesize of output 63 [2021-11-25 20:33:32,273 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2021-11-25 20:33:32,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:32,723 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2021-11-25 20:33:32,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [147968757] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:32,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1879095536] [2021-11-25 20:33:32,725 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:33:32,726 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:32,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:32,726 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:32,726 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:32,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:32,750 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:33:32,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 20:33:32,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:32,772 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:33:32,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:33:32,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:32,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:33:32,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:32,869 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:32,890 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:33:32,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2021-11-25 20:33:32,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:32,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:33:33,057 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:33,468 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1326#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~marker~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start_main_~pos~0#1| 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~pos~0#1|) (= (ite (<= |ULTIMATE.start_main_~i~1#1| |ULTIMATE.start_main_~pos~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~marker~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_main_~marker~0#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:33,468 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:33,468 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:33,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 10, 10] total 44 [2021-11-25 20:33:33,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786079522] [2021-11-25 20:33:33,469 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:33,470 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-25 20:33:33,470 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:33,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-25 20:33:33,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=514, Invalid=2036, Unknown=0, NotChecked=0, Total=2550 [2021-11-25 20:33:33,472 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 44 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 44 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:34,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:34,109 INFO L93 Difference]: Finished difference Result 67 states and 72 transitions. [2021-11-25 20:33:34,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-25 20:33:34,110 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 44 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-25 20:33:34,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:34,110 INFO L225 Difference]: With dead ends: 67 [2021-11-25 20:33:34,111 INFO L226 Difference]: Without dead ends: 48 [2021-11-25 20:33:34,113 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 876 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=622, Invalid=3038, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 20:33:34,113 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 27 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:34,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 35 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 137 Invalid, 0 Unknown, 27 Unchecked, 0.1s Time] [2021-11-25 20:33:34,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-25 20:33:34,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-11-25 20:33:34,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:34,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2021-11-25 20:33:34,123 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 40 [2021-11-25 20:33:34,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:34,124 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2021-11-25 20:33:34,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 44 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:34,124 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2021-11-25 20:33:34,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-25 20:33:34,126 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:34,126 INFO L514 BasicCegarLoop]: trace histogram [27, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:34,159 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:34,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:34,354 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:34,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:34,354 INFO L85 PathProgramCache]: Analyzing trace with hash -1838786906, now seen corresponding path program 6 times [2021-11-25 20:33:34,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:34,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311146858] [2021-11-25 20:33:34,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:34,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:34,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:34,771 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:33:34,772 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:34,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311146858] [2021-11-25 20:33:34,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311146858] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:34,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914334177] [2021-11-25 20:33:34,772 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:33:34,772 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:34,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:34,778 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:34,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:33:34,889 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:33:34,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:33:34,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 20:33:34,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:34,985 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:33:34,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:35,912 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:33:35,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914334177] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:35,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1636829644] [2021-11-25 20:33:35,914 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:33:35,914 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:35,914 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:35,915 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:35,915 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:35,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:35,949 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:33:35,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:33:35,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:35,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:33:35,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:35,981 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:33:36,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:36,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:36,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:36,048 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:33:36,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-25 20:33:36,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:36,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:33:36,168 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:36,440 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1876#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~marker~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start_main_~pos~0#1| 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~pos~0#1|) (= (ite (<= |ULTIMATE.start_main_~i~1#1| |ULTIMATE.start_main_~pos~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~marker~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_main_~marker~0#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:36,441 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:36,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:36,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2021-11-25 20:33:36,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076752624] [2021-11-25 20:33:36,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:36,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-25 20:33:36,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:36,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-25 20:33:36,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1685, Invalid=2475, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 20:33:36,446 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 58 states, 58 states have (on average 1.1206896551724137) internal successors, (65), 57 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:36,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:36,561 INFO L93 Difference]: Finished difference Result 96 states and 126 transitions. [2021-11-25 20:33:36,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-25 20:33:36,562 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.1206896551724137) internal successors, (65), 57 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-25 20:33:36,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:36,566 INFO L225 Difference]: With dead ends: 96 [2021-11-25 20:33:36,567 INFO L226 Difference]: Without dead ends: 77 [2021-11-25 20:33:36,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 577 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1685, Invalid=2475, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 20:33:36,569 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:36,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:33:36,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-25 20:33:36,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-11-25 20:33:36,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.0263157894736843) internal successors, (78), 76 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:36,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2021-11-25 20:33:36,598 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 47 [2021-11-25 20:33:36,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:36,600 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2021-11-25 20:33:36,600 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.1206896551724137) internal successors, (65), 57 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:36,600 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2021-11-25 20:33:36,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-25 20:33:36,606 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:36,607 INFO L514 BasicCegarLoop]: trace histogram [56, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:36,644 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:36,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:36,814 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:36,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:36,814 INFO L85 PathProgramCache]: Analyzing trace with hash -385874286, now seen corresponding path program 7 times [2021-11-25 20:33:36,814 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:36,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406363421] [2021-11-25 20:33:36,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:36,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:36,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:38,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1638 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:33:38,332 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:38,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406363421] [2021-11-25 20:33:38,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406363421] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:38,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1035549619] [2021-11-25 20:33:38,333 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:33:38,333 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:38,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:38,335 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:38,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:33:38,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:38,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 593 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-25 20:33:38,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:38,709 INFO L134 CoverageAnalysis]: Checked inductivity of 1638 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:33:38,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:42,107 INFO L134 CoverageAnalysis]: Checked inductivity of 1638 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:33:42,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1035549619] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:42,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1661039906] [2021-11-25 20:33:42,109 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:33:42,109 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:42,110 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:42,110 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:42,110 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:42,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:42,136 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:33:42,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 20:33:42,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:42,170 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:33:42,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:33:42,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:42,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:33:42,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:42,274 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:33:42,296 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:33:42,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2021-11-25 20:33:42,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:42,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:33:42,438 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:42,848 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2757#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~marker~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start_main_~pos~0#1| 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~pos~0#1|) (= (ite (<= |ULTIMATE.start_main_~i~1#1| |ULTIMATE.start_main_~pos~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~marker~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_main_~marker~0#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:42,848 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:42,849 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:42,849 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 115 [2021-11-25 20:33:42,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577818129] [2021-11-25 20:33:42,849 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:42,850 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2021-11-25 20:33:42,850 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:42,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2021-11-25 20:33:42,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6702, Invalid=8304, Unknown=0, NotChecked=0, Total=15006 [2021-11-25 20:33:42,857 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand has 116 states, 116 states have (on average 1.0603448275862069) internal successors, (123), 115 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:43,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:43,075 INFO L93 Difference]: Finished difference Result 154 states and 213 transitions. [2021-11-25 20:33:43,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2021-11-25 20:33:43,076 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 1.0603448275862069) internal successors, (123), 115 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-25 20:33:43,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:43,078 INFO L225 Difference]: With dead ends: 154 [2021-11-25 20:33:43,078 INFO L226 Difference]: Without dead ends: 135 [2021-11-25 20:33:43,083 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 163 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1186 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=6702, Invalid=8304, Unknown=0, NotChecked=0, Total=15006 [2021-11-25 20:33:43,086 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:43,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:33:43,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-25 20:33:43,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-11-25 20:33:43,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 1.0149253731343284) internal successors, (136), 134 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:43,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2021-11-25 20:33:43,125 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 76 [2021-11-25 20:33:43,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:43,126 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2021-11-25 20:33:43,127 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 116 states have (on average 1.0603448275862069) internal successors, (123), 115 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:43,127 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2021-11-25 20:33:43,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-25 20:33:43,144 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:43,144 INFO L514 BasicCegarLoop]: trace histogram [114, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:43,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:43,361 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-25 20:33:43,361 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:43,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:43,362 INFO L85 PathProgramCache]: Analyzing trace with hash 1903206162, now seen corresponding path program 8 times [2021-11-25 20:33:43,362 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:43,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219127623] [2021-11-25 20:33:43,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:43,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:43,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:33:48,030 INFO L134 CoverageAnalysis]: Checked inductivity of 6597 backedges. 0 proven. 6555 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:33:48,030 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:33:48,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219127623] [2021-11-25 20:33:48,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1219127623] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:33:48,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435280822] [2021-11-25 20:33:48,030 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:33:48,031 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:48,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:33:48,032 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:33:48,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:33:48,290 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-25 20:33:48,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:33:48,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-25 20:33:48,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:33:48,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:33:50,150 INFO L354 Elim1Store]: treesize reduction 156, result has 44.9 percent of original size [2021-11-25 20:33:50,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 74 treesize of output 153 [2021-11-25 20:33:50,717 INFO L134 CoverageAnalysis]: Checked inductivity of 6597 backedges. 0 proven. 381 refuted. 0 times theorem prover too weak. 6216 trivial. 0 not checked. [2021-11-25 20:33:50,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:33:52,840 INFO L134 CoverageAnalysis]: Checked inductivity of 6597 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 6555 trivial. 0 not checked. [2021-11-25 20:33:52,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1435280822] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:33:52,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1356529676] [2021-11-25 20:33:52,842 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:33:52,842 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:33:52,843 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:33:52,843 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:33:52,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:33:52,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:52,886 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:33:52,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:33:52,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:52,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:33:52,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:52,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:33:52,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:52,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:52,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:33:52,983 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:33:52,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-25 20:33:53,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:33:53,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:33:53,096 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:33:53,906 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4249#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~marker~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start_main_~pos~0#1| 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~pos~0#1|) (= (ite (<= |ULTIMATE.start_main_~i~1#1| |ULTIMATE.start_main_~pos~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~marker~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_main_~marker~0#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:33:53,906 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:33:53,907 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:33:53,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [116, 19, 16] total 147 [2021-11-25 20:33:53,907 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898803110] [2021-11-25 20:33:53,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:33:53,908 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 147 states [2021-11-25 20:33:53,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:33:53,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2021-11-25 20:33:53,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7360, Invalid=16202, Unknown=0, NotChecked=0, Total=23562 [2021-11-25 20:33:53,914 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand has 147 states, 147 states have (on average 1.1088435374149659) internal successors, (163), 147 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:56,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:33:56,738 INFO L93 Difference]: Finished difference Result 171 states and 179 transitions. [2021-11-25 20:33:56,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 143 states. [2021-11-25 20:33:56,739 INFO L78 Accepts]: Start accepts. Automaton has has 147 states, 147 states have (on average 1.1088435374149659) internal successors, (163), 147 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 134 [2021-11-25 20:33:56,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:33:56,740 INFO L225 Difference]: With dead ends: 171 [2021-11-25 20:33:56,740 INFO L226 Difference]: Without dead ends: 148 [2021-11-25 20:33:56,743 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 363 SyntacticMatches, 1 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5441 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=7578, Invalid=20144, Unknown=0, NotChecked=0, Total=27722 [2021-11-25 20:33:56,744 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 36 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 335 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 161 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:33:56,744 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 38 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 335 Invalid, 0 Unknown, 161 Unchecked, 0.2s Time] [2021-11-25 20:33:56,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-25 20:33:56,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2021-11-25 20:33:56,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 147 states have (on average 1.0136054421768708) internal successors, (149), 147 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:56,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2021-11-25 20:33:56,771 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 134 [2021-11-25 20:33:56,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:33:56,772 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2021-11-25 20:33:56,773 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 147 states, 147 states have (on average 1.1088435374149659) internal successors, (163), 147 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:33:56,773 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2021-11-25 20:33:56,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-25 20:33:56,774 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:33:56,775 INFO L514 BasicCegarLoop]: trace histogram [115, 13, 12, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:33:56,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:33:56,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:33:56,993 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:33:56,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:33:56,994 INFO L85 PathProgramCache]: Analyzing trace with hash -1600793016, now seen corresponding path program 9 times [2021-11-25 20:33:56,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:33:56,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155937629] [2021-11-25 20:33:56,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:33:56,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:33:57,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:34:01,704 INFO L134 CoverageAnalysis]: Checked inductivity of 6826 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-25 20:34:01,705 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:34:01,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155937629] [2021-11-25 20:34:01,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1155937629] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:34:01,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873077518] [2021-11-25 20:34:01,705 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:34:01,706 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:34:01,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:34:01,709 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:34:01,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:34:02,029 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:34:02,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:34:02,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 1154 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-25 20:34:02,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:34:02,377 INFO L134 CoverageAnalysis]: Checked inductivity of 6826 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-25 20:34:02,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:34:15,444 INFO L134 CoverageAnalysis]: Checked inductivity of 6826 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-25 20:34:15,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1873077518] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:34:15,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [415715301] [2021-11-25 20:34:15,447 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:34:15,447 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:34:15,447 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:34:15,447 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:34:15,447 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:34:15,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:15,467 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:34:15,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 20:34:15,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:15,486 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:34:15,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:34:15,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:15,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:34:15,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:15,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:15,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:34:15,590 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:34:15,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-25 20:34:15,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:34:15,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:34:15,717 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:34:16,379 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5976#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~marker~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start_main_~pos~0#1| 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~pos~0#1|) (= (ite (<= |ULTIMATE.start_main_~i~1#1| |ULTIMATE.start_main_~pos~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~marker~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_main_~marker~0#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:34:16,379 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:34:16,379 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:34:16,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 233 [2021-11-25 20:34:16,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326243417] [2021-11-25 20:34:16,379 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:34:16,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 234 states [2021-11-25 20:34:16,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:34:16,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 234 interpolants. [2021-11-25 20:34:16,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27293, Invalid=30547, Unknown=0, NotChecked=0, Total=57840 [2021-11-25 20:34:16,393 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand has 234 states, 234 states have (on average 1.0299145299145298) internal successors, (241), 233 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:34:16,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:34:16,918 INFO L93 Difference]: Finished difference Result 296 states and 414 transitions. [2021-11-25 20:34:16,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 234 states. [2021-11-25 20:34:16,918 INFO L78 Accepts]: Start accepts. Automaton has has 234 states, 234 states have (on average 1.0299145299145298) internal successors, (241), 233 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 147 [2021-11-25 20:34:16,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:34:16,920 INFO L225 Difference]: With dead ends: 296 [2021-11-25 20:34:16,920 INFO L226 Difference]: Without dead ends: 265 [2021-11-25 20:34:16,925 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 317 SyntacticMatches, 0 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2425 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=27293, Invalid=30547, Unknown=0, NotChecked=0, Total=57840 [2021-11-25 20:34:16,925 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 363 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:34:16,926 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 49 Invalid, 363 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:34:16,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-11-25 20:34:16,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 265. [2021-11-25 20:34:16,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 264 states have (on average 1.0075757575757576) internal successors, (266), 264 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:34:16,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 266 transitions. [2021-11-25 20:34:16,953 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 266 transitions. Word has length 147 [2021-11-25 20:34:16,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:34:16,953 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 266 transitions. [2021-11-25 20:34:16,954 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 234 states, 234 states have (on average 1.0299145299145298) internal successors, (241), 233 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:34:16,954 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 266 transitions. [2021-11-25 20:34:16,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2021-11-25 20:34:16,958 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:34:16,958 INFO L514 BasicCegarLoop]: trace histogram [232, 13, 12, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:34:16,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:34:17,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:34:17,174 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:34:17,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:34:17,174 INFO L85 PathProgramCache]: Analyzing trace with hash -1527935436, now seen corresponding path program 10 times [2021-11-25 20:34:17,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:34:17,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507412940] [2021-11-25 20:34:17,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:34:17,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:34:17,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:34:35,511 INFO L134 CoverageAnalysis]: Checked inductivity of 27184 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-25 20:34:35,512 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:34:35,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507412940] [2021-11-25 20:34:35,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [507412940] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:34:35,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933001462] [2021-11-25 20:34:35,512 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:34:35,512 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:34:35,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:34:35,514 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:34:35,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:34:36,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:34:36,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 2207 conjuncts, 234 conjunts are in the unsatisfiable core [2021-11-25 20:34:36,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:34:36,556 INFO L134 CoverageAnalysis]: Checked inductivity of 27184 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-25 20:34:36,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:35:28,905 INFO L134 CoverageAnalysis]: Checked inductivity of 27184 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-25 20:35:28,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [933001462] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:35:28,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2013391773] [2021-11-25 20:35:28,907 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:35:28,907 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:35:28,908 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:35:28,908 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:35:28,908 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:35:28,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:28,944 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:35:28,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 20:35:28,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:28,966 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:35:28,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:35:28,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:28,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:35:29,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:29,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:29,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:35:29,044 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 20:35:29,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-25 20:35:29,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:35:29,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:35:29,138 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:35:30,271 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9095#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~marker~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start_main_~pos~0#1| 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~pos~0#1|) (= (ite (<= |ULTIMATE.start_main_~i~1#1| |ULTIMATE.start_main_~pos~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~marker~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_main_~marker~0#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:35:30,272 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:35:30,272 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:35:30,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [234, 234, 234] total 467 [2021-11-25 20:35:30,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620893876] [2021-11-25 20:35:30,272 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:35:30,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 468 states [2021-11-25 20:35:30,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:35:30,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 468 interpolants. [2021-11-25 20:35:30,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109310, Invalid=115840, Unknown=0, NotChecked=0, Total=225150 [2021-11-25 20:35:30,297 INFO L87 Difference]: Start difference. First operand 265 states and 266 transitions. Second operand has 468 states, 468 states have (on average 1.014957264957265) internal successors, (475), 467 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:35:33,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:35:33,266 INFO L93 Difference]: Finished difference Result 530 states and 765 transitions. [2021-11-25 20:35:33,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 468 states. [2021-11-25 20:35:33,273 INFO L78 Accepts]: Start accepts. Automaton has has 468 states, 468 states have (on average 1.014957264957265) internal successors, (475), 467 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 264 [2021-11-25 20:35:33,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:35:33,284 INFO L225 Difference]: With dead ends: 530 [2021-11-25 20:35:33,284 INFO L226 Difference]: Without dead ends: 499 [2021-11-25 20:35:33,295 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1024 GetRequests, 551 SyntacticMatches, 0 SemanticMatches, 473 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4882 ImplicationChecksByTransitivity, 70.1s TimeCoverageRelationStatistics Valid=109310, Invalid=115840, Unknown=0, NotChecked=0, Total=225150 [2021-11-25 20:35:33,296 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 476 mSolverCounterSat, 239 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 715 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 239 IncrementalHoareTripleChecker+Valid, 476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:35:33,296 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 715 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [239 Valid, 476 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:35:33,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 499 states. [2021-11-25 20:35:33,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 499 to 499. [2021-11-25 20:35:33,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 498 states have (on average 1.0040160642570282) internal successors, (500), 498 states have internal predecessors, (500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:35:33,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 500 transitions. [2021-11-25 20:35:33,345 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 500 transitions. Word has length 264 [2021-11-25 20:35:33,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:35:33,346 INFO L470 AbstractCegarLoop]: Abstraction has 499 states and 500 transitions. [2021-11-25 20:35:33,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 468 states, 468 states have (on average 1.014957264957265) internal successors, (475), 467 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:35:33,347 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 500 transitions. [2021-11-25 20:35:33,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2021-11-25 20:35:33,357 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:35:33,358 INFO L514 BasicCegarLoop]: trace histogram [466, 13, 12, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:35:33,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:35:33,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 20:35:33,575 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:35:33,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:35:33,576 INFO L85 PathProgramCache]: Analyzing trace with hash 1124680372, now seen corresponding path program 11 times [2021-11-25 20:35:33,577 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:35:33,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [592284923] [2021-11-25 20:35:33,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:35:33,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:35:35,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:45,242 INFO L134 CoverageAnalysis]: Checked inductivity of 108967 backedges. 0 proven. 108811 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-25 20:36:45,242 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:45,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [592284923] [2021-11-25 20:36:45,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [592284923] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:45,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [291805390] [2021-11-25 20:36:45,243 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:36:45,243 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:45,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:45,261 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:45,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:36:46,603 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-25 20:36:46,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:36:46,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-25 20:36:46,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:47,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:37:01,659 INFO L354 Elim1Store]: treesize reduction 946, result has 8.4 percent of original size [2021-11-25 20:37:01,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 13 select indices, 13 select index equivalence classes, 0 disjoint index pairs (out of 78 index pairs), introduced 13 new quantified variables, introduced 78 case distinctions, treesize of input 137 treesize of output 137 [2021-11-25 20:37:02,883 INFO L134 CoverageAnalysis]: Checked inductivity of 108967 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 108811 trivial. 0 not checked. [2021-11-25 20:37:02,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:13,116 INFO L134 CoverageAnalysis]: Checked inductivity of 108967 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 108811 trivial. 0 not checked. [2021-11-25 20:37:13,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [291805390] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:13,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1407604250] [2021-11-25 20:37:13,118 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:37:13,119 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:13,119 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:13,119 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:13,119 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:13,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:13,148 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:37:13,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:37:13,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:13,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:37:13,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:13,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:37:13,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:13,213 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:37:13,233 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:37:13,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2021-11-25 20:37:13,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:37:13,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:37:13,389 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:15,742 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14606#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~marker~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start_main_~pos~0#1| 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~pos~0#1|) (= (ite (<= |ULTIMATE.start_main_~i~1#1| |ULTIMATE.start_main_~pos~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~marker~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_main_~marker~0#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:37:15,742 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:15,742 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:15,742 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [468, 28, 28] total 520 [2021-11-25 20:37:15,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921529970] [2021-11-25 20:37:15,743 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:15,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 520 states [2021-11-25 20:37:15,745 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:15,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 520 interpolants. [2021-11-25 20:37:15,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110361, Invalid=166841, Unknown=0, NotChecked=0, Total=277202 [2021-11-25 20:37:15,773 INFO L87 Difference]: Start difference. First operand 499 states and 500 transitions. Second operand has 520 states, 520 states have (on average 1.0288461538461537) internal successors, (535), 520 states have internal predecessors, (535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:43,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:43,052 INFO L93 Difference]: Finished difference Result 583 states and 598 transitions. [2021-11-25 20:37:43,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 531 states. [2021-11-25 20:37:43,053 INFO L78 Accepts]: Start accepts. Automaton has has 520 states, 520 states have (on average 1.0288461538461537) internal successors, (535), 520 states have internal predecessors, (535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 498 [2021-11-25 20:37:43,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:43,057 INFO L225 Difference]: With dead ends: 583 [2021-11-25 20:37:43,057 INFO L226 Difference]: Without dead ends: 526 [2021-11-25 20:37:43,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1998 GetRequests, 1434 SyntacticMatches, 1 SemanticMatches, 563 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30023 ImplicationChecksByTransitivity, 118.1s TimeCoverageRelationStatistics Valid=111591, Invalid=207069, Unknown=0, NotChecked=0, Total=318660 [2021-11-25 20:37:43,080 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 243 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 1508 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 1616 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 1508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:43,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [243 Valid, 85 Invalid, 1616 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 1508 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 20:37:43,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2021-11-25 20:37:43,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 526. [2021-11-25 20:37:43,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 526 states, 525 states have (on average 1.0038095238095237) internal successors, (527), 525 states have internal predecessors, (527), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:43,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 526 states to 526 states and 527 transitions. [2021-11-25 20:37:43,132 INFO L78 Accepts]: Start accepts. Automaton has 526 states and 527 transitions. Word has length 498 [2021-11-25 20:37:43,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:43,133 INFO L470 AbstractCegarLoop]: Abstraction has 526 states and 527 transitions. [2021-11-25 20:37:43,134 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 520 states, 520 states have (on average 1.0288461538461537) internal successors, (535), 520 states have internal predecessors, (535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:43,134 INFO L276 IsEmpty]: Start isEmpty. Operand 526 states and 527 transitions. [2021-11-25 20:37:43,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 526 [2021-11-25 20:37:43,147 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:43,147 INFO L514 BasicCegarLoop]: trace histogram [467, 26, 25, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:37:43,187 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:43,361 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 20:37:43,362 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:37:43,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:43,362 INFO L85 PathProgramCache]: Analyzing trace with hash 1740019079, now seen corresponding path program 12 times [2021-11-25 20:37:43,362 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:43,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843116333] [2021-11-25 20:37:43,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:43,362 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:44,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:54,503 INFO L134 CoverageAnalysis]: Checked inductivity of 109928 backedges. 0 proven. 109278 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2021-11-25 20:38:54,504 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:54,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843116333] [2021-11-25 20:38:54,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843116333] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:54,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100061071] [2021-11-25 20:38:54,504 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:38:54,504 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:54,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:54,508 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:54,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:38:55,406 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:38:55,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:55,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 4387 conjuncts, 469 conjunts are in the unsatisfiable core [2021-11-25 20:38:55,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:56,407 INFO L134 CoverageAnalysis]: Checked inductivity of 109928 backedges. 0 proven. 109278 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2021-11-25 20:38:56,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:42:30,550 INFO L134 CoverageAnalysis]: Checked inductivity of 109928 backedges. 0 proven. 109278 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2021-11-25 20:42:30,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2100061071] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:42:30,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [199202239] [2021-11-25 20:42:30,553 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:42:30,553 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:42:30,553 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:42:30,553 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:42:30,554 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:42:30,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:30,579 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 20:42:30,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 20:42:30,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:30,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:42:30,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:30,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:42:30,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:30,637 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:42:30,655 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 20:42:30,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2021-11-25 20:42:30,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:42:30,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:42:30,816 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:42:32,914 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20881#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~marker~0#1| 2147483648)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start_main_~pos~0#1| 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~pos~0#1|) (= (ite (<= |ULTIMATE.start_main_~i~1#1| |ULTIMATE.start_main_~pos~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~marker~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= |ULTIMATE.start_main_~marker~0#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:42:32,914 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:42:32,914 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:42:32,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [469, 469, 469] total 937 [2021-11-25 20:42:32,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400049390] [2021-11-25 20:42:32,915 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:42:32,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 938 states [2021-11-25 20:42:32,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:42:33,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 938 interpolants. [2021-11-25 20:42:33,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=439485, Invalid=452595, Unknown=0, NotChecked=0, Total=892080 [2021-11-25 20:42:33,138 INFO L87 Difference]: Start difference. First operand 526 states and 527 transitions. Second operand has 938 states, 938 states have (on average 1.007462686567164) internal successors, (945), 937 states have internal predecessors, (945), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:57,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:57,444 INFO L93 Difference]: Finished difference Result 1052 states and 1522 transitions. [2021-11-25 20:42:57,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 938 states. [2021-11-25 20:42:57,445 INFO L78 Accepts]: Start accepts. Automaton has has 938 states, 938 states have (on average 1.007462686567164) internal successors, (945), 937 states have internal predecessors, (945), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 525 [2021-11-25 20:42:57,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:57,451 INFO L225 Difference]: With dead ends: 1052 [2021-11-25 20:42:57,452 INFO L226 Difference]: Without dead ends: 995 [2021-11-25 20:42:57,512 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2042 GetRequests, 1099 SyntacticMatches, 0 SemanticMatches, 943 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9817 ImplicationChecksByTransitivity, 284.0s TimeCoverageRelationStatistics Valid=439485, Invalid=452595, Unknown=0, NotChecked=0, Total=892080 [2021-11-25 20:42:57,513 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 949 mSolverCounterSat, 474 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 1423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 474 IncrementalHoareTripleChecker+Valid, 949 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:57,513 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 77 Invalid, 1423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [474 Valid, 949 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:42:57,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 995 states. [2021-11-25 20:42:57,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 995 to 995. [2021-11-25 20:42:57,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 995 states, 994 states have (on average 1.0020120724346075) internal successors, (996), 994 states have internal predecessors, (996), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:57,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 995 states to 995 states and 996 transitions. [2021-11-25 20:42:57,700 INFO L78 Accepts]: Start accepts. Automaton has 995 states and 996 transitions. Word has length 525 [2021-11-25 20:42:57,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:42:57,701 INFO L470 AbstractCegarLoop]: Abstraction has 995 states and 996 transitions. [2021-11-25 20:42:57,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 938 states, 938 states have (on average 1.007462686567164) internal successors, (945), 937 states have internal predecessors, (945), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:57,703 INFO L276 IsEmpty]: Start isEmpty. Operand 995 states and 996 transitions. [2021-11-25 20:42:57,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 995 [2021-11-25 20:42:57,712 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:42:57,713 INFO L514 BasicCegarLoop]: trace histogram [936, 26, 25, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:42:57,755 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:42:57,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f796c8e1-5f33-4347-bf63-97de672416d0/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:42:57,937 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:42:57,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:42:57,938 INFO L85 PathProgramCache]: Analyzing trace with hash -15260045, now seen corresponding path program 13 times [2021-11-25 20:42:57,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:42:57,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879525590] [2021-11-25 20:42:57,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:57,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:43:03,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat