./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/array_3-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/array_3-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba --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 42bdab47928922c9249a376933fe7b7a33d855d426cfe04eb271066ef5c44d0a --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-b5237d8 [2022-11-22 02:01:52,767 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 02:01:52,768 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 02:01:52,788 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 02:01:52,788 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 02:01:52,789 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 02:01:52,791 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 02:01:52,792 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 02:01:52,794 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 02:01:52,795 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 02:01:52,796 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 02:01:52,797 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 02:01:52,798 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 02:01:52,799 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 02:01:52,800 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 02:01:52,801 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 02:01:52,802 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 02:01:52,803 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 02:01:52,805 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 02:01:52,806 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 02:01:52,808 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 02:01:52,809 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 02:01:52,810 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 02:01:52,811 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 02:01:52,815 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 02:01:52,815 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 02:01:52,816 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 02:01:52,817 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 02:01:52,817 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 02:01:52,818 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 02:01:52,818 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 02:01:52,819 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 02:01:52,820 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 02:01:52,821 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 02:01:52,822 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 02:01:52,822 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 02:01:52,828 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 02:01:52,829 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 02:01:52,829 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 02:01:52,831 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 02:01:52,833 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 02:01:52,834 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 02:01:52,859 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 02:01:52,859 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 02:01:52,860 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 02:01:52,860 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 02:01:52,861 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 02:01:52,861 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 02:01:52,861 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 02:01:52,861 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 02:01:52,861 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 02:01:52,862 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 02:01:52,862 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 02:01:52,862 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 02:01:52,862 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 02:01:52,862 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 02:01:52,862 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 02:01:52,863 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 02:01:52,863 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 02:01:52,863 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 02:01:52,864 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 02:01:52,864 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 02:01:52,864 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 02:01:52,864 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 02:01:52,864 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 02:01:52,865 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 02:01:52,865 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 02:01:52,865 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 02:01:52,865 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 02:01:52,865 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 02:01:52,866 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 02:01:52,866 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 02:01:52,866 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 02:01:52,866 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 02:01:52,866 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:01:52,868 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 02:01:52,868 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 02:01:52,868 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 02:01:52,868 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 02:01:52,868 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 02:01:52,868 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 02:01:52,869 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 02:01:52,869 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 02:01:52,869 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 42bdab47928922c9249a376933fe7b7a33d855d426cfe04eb271066ef5c44d0a [2022-11-22 02:01:53,111 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 02:01:53,134 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 02:01:53,136 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 02:01:53,138 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 02:01:53,138 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 02:01:53,140 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/loop-acceleration/array_3-2.i [2022-11-22 02:01:56,276 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 02:01:56,489 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 02:01:56,490 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/sv-benchmarks/c/loop-acceleration/array_3-2.i [2022-11-22 02:01:56,496 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/data/9ab81b789/a23e437e467c47e8b1e0358ea7c6bcde/FLAG52a626f2a [2022-11-22 02:01:56,514 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/data/9ab81b789/a23e437e467c47e8b1e0358ea7c6bcde [2022-11-22 02:01:56,521 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 02:01:56,523 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 02:01:56,527 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 02:01:56,527 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 02:01:56,531 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 02:01:56,532 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:01:56" (1/1) ... [2022-11-22 02:01:56,534 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@649e0cb7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:01:56, skipping insertion in model container [2022-11-22 02:01:56,534 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:01:56" (1/1) ... [2022-11-22 02:01:56,542 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 02:01:56,563 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 02:01:56,751 WARN L237 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_53833fc5-d87a-4957-9438-6eaabe2f118e/sv-benchmarks/c/loop-acceleration/array_3-2.i[809,822] [2022-11-22 02:01:56,768 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:01:56,779 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 02:01:56,794 WARN L237 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_53833fc5-d87a-4957-9438-6eaabe2f118e/sv-benchmarks/c/loop-acceleration/array_3-2.i[809,822] [2022-11-22 02:01:56,802 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:01:56,818 INFO L208 MainTranslator]: Completed translation [2022-11-22 02:01:56,819 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:01:56 WrapperNode [2022-11-22 02:01:56,819 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 02:01:56,820 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 02:01:56,820 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 02:01:56,821 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 02:01:56,829 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:01:56" (1/1) ... [2022-11-22 02:01:56,836 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:01:56" (1/1) ... [2022-11-22 02:01:56,857 INFO L138 Inliner]: procedures = 16, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 47 [2022-11-22 02:01:56,858 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 02:01:56,859 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 02:01:56,860 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 02:01:56,860 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 02:01:56,868 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:01:56" (1/1) ... [2022-11-22 02:01:56,868 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:01:56" (1/1) ... [2022-11-22 02:01:56,870 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:01:56" (1/1) ... [2022-11-22 02:01:56,871 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:01:56" (1/1) ... [2022-11-22 02:01:56,875 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:01:56" (1/1) ... [2022-11-22 02:01:56,878 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:01:56" (1/1) ... [2022-11-22 02:01:56,879 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:01:56" (1/1) ... [2022-11-22 02:01:56,880 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:01:56" (1/1) ... [2022-11-22 02:01:56,882 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 02:01:56,883 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 02:01:56,883 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 02:01:56,883 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 02:01:56,884 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:01:56" (1/1) ... [2022-11-22 02:01:56,899 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:01:56,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:01:56,931 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 02:01:56,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 02:01:56,986 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 02:01:56,986 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 02:01:56,986 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-22 02:01:56,986 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-22 02:01:56,987 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 02:01:56,987 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 02:01:56,987 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-22 02:01:56,987 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-22 02:01:57,069 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 02:01:57,071 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 02:01:57,263 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 02:01:57,294 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 02:01:57,295 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-22 02:01:57,297 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:01:57 BoogieIcfgContainer [2022-11-22 02:01:57,298 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 02:01:57,300 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 02:01:57,300 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 02:01:57,304 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 02:01:57,304 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 02:01:56" (1/3) ... [2022-11-22 02:01:57,305 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c6bdd8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:01:57, skipping insertion in model container [2022-11-22 02:01:57,305 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:01:56" (2/3) ... [2022-11-22 02:01:57,306 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c6bdd8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:01:57, skipping insertion in model container [2022-11-22 02:01:57,306 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:01:57" (3/3) ... [2022-11-22 02:01:57,307 INFO L112 eAbstractionObserver]: Analyzing ICFG array_3-2.i [2022-11-22 02:01:57,327 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 02:01:57,327 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 02:01:57,376 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 02:01:57,383 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@4ff54e7b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 02:01:57,384 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 02:01:57,388 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 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) [2022-11-22 02:01:57,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-22 02:01:57,394 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:01:57,395 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-22 02:01:57,396 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:01:57,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:01:57,402 INFO L85 PathProgramCache]: Analyzing trace with hash -1804998677, now seen corresponding path program 1 times [2022-11-22 02:01:57,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:01:57,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [158301057] [2022-11-22 02:01:57,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:01:57,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:01:57,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:57,594 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:57,595 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:01:57,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [158301057] [2022-11-22 02:01:57,596 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [158301057] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:01:57,597 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:01:57,598 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 02:01:57,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496431210] [2022-11-22 02:01:57,600 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:01:57,604 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-22 02:01:57,606 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:01:57,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-22 02:01:57,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 02:01:57,653 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 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) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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) [2022-11-22 02:01:57,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:01:57,716 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2022-11-22 02:01:57,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-22 02:01:57,719 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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 6 [2022-11-22 02:01:57,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:01:57,727 INFO L225 Difference]: With dead ends: 16 [2022-11-22 02:01:57,738 INFO L226 Difference]: Without dead ends: 8 [2022-11-22 02:01:57,741 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 02:01:57,744 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:01:57,745 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:01:57,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2022-11-22 02:01:57,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2022-11-22 02:01:57,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) 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) [2022-11-22 02:01:57,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2022-11-22 02:01:57,796 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2022-11-22 02:01:57,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:01:57,796 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2022-11-22 02:01:57,797 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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) [2022-11-22 02:01:57,797 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2022-11-22 02:01:57,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-22 02:01:57,797 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:01:57,797 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:01:57,798 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-22 02:01:57,798 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:01:57,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:01:57,799 INFO L85 PathProgramCache]: Analyzing trace with hash -99384387, now seen corresponding path program 1 times [2022-11-22 02:01:57,799 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:01:57,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619194542] [2022-11-22 02:01:57,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:01:57,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:01:57,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:57,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:57,959 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:01:57,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619194542] [2022-11-22 02:01:57,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619194542] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:01:57,960 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:01:57,960 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 02:01:57,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276144717] [2022-11-22 02:01:57,961 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:01:57,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-22 02:01:57,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:01:57,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-22 02:01:57,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 02:01:57,965 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. 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) [2022-11-22 02:01:58,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:01:58,006 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2022-11-22 02:01:58,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 02:01:58,006 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 [2022-11-22 02:01:58,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:01:58,007 INFO L225 Difference]: With dead ends: 21 [2022-11-22 02:01:58,007 INFO L226 Difference]: Without dead ends: 15 [2022-11-22 02:01:58,007 INFO L412 NwaCegarLoop]: 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 [2022-11-22 02:01:58,009 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:01:58,010 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 6 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:01:58,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-22 02:01:58,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 9. [2022-11-22 02:01:58,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 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) [2022-11-22 02:01:58,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2022-11-22 02:01:58,013 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 7 [2022-11-22 02:01:58,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:01:58,014 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2022-11-22 02:01:58,014 INFO L496 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) [2022-11-22 02:01:58,014 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2022-11-22 02:01:58,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-22 02:01:58,015 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:01:58,015 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:01:58,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-22 02:01:58,015 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:01:58,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:01:58,016 INFO L85 PathProgramCache]: Analyzing trace with hash -1507211673, now seen corresponding path program 1 times [2022-11-22 02:01:58,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:01:58,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214180128] [2022-11-22 02:01:58,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:01:58,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:01:58,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:58,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:58,146 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:01:58,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214180128] [2022-11-22 02:01:58,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [214180128] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:01:58,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474663047] [2022-11-22 02:01:58,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:01:58,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:01:58,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:01:58,151 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:01:58,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 02:01:58,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:58,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-22 02:01:58,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:01:58,268 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:58,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:01:58,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:58,311 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474663047] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:01:58,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1011121232] [2022-11-22 02:01:58,336 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-22 02:01:58,336 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:01:58,340 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:01:58,345 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:01:58,346 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:01:58,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:01:58,482 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 02:01:58,486 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:01:58,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:01:58,520 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:01:58,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:01:58,588 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:01:58,721 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:01:58,723 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:01:58,754 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:01:58,755 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:01:58,921 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:01:59,021 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:01:59,183 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1011121232] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:01:59,185 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:01:59,185 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3, 3] total 11 [2022-11-22 02:01:59,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374211388] [2022-11-22 02:01:59,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:01:59,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-22 02:01:59,188 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:01:59,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-22 02:01:59,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=73, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:01:59,189 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 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) [2022-11-22 02:01:59,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:01:59,237 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2022-11-22 02:01:59,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 02:01:59,238 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 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 8 [2022-11-22 02:01:59,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:01:59,238 INFO L225 Difference]: With dead ends: 15 [2022-11-22 02:01:59,239 INFO L226 Difference]: Without dead ends: 11 [2022-11-22 02:01:59,242 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=73, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:01:59,246 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 9 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:01:59,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 5 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:01:59,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2022-11-22 02:01:59,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2022-11-22 02:01:59,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 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) [2022-11-22 02:01:59,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2022-11-22 02:01:59,257 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2022-11-22 02:01:59,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:01:59,259 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2022-11-22 02:01:59,259 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 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) [2022-11-22 02:01:59,259 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2022-11-22 02:01:59,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-22 02:01:59,260 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:01:59,260 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:01:59,267 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-22 02:01:59,465 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:01:59,465 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:01:59,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:01:59,466 INFO L85 PathProgramCache]: Analyzing trace with hash -320276660, now seen corresponding path program 1 times [2022-11-22 02:01:59,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:01:59,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552995021] [2022-11-22 02:01:59,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:01:59,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:01:59,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:59,576 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:01:59,576 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:01:59,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552995021] [2022-11-22 02:01:59,576 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [552995021] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:01:59,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [534380663] [2022-11-22 02:01:59,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:01:59,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:01:59,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:01:59,578 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:01:59,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 02:01:59,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:59,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-22 02:01:59,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:01:59,646 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:01:59,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:01:59,662 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:01:59,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [534380663] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:01:59,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1317687895] [2022-11-22 02:01:59,665 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-22 02:01:59,665 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:01:59,665 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:01:59,665 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:01:59,666 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:01:59,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:01:59,699 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 02:01:59,699 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:01:59,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:01:59,711 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:01:59,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:01:59,737 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:01:59,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:01:59,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:01:59,811 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:01:59,812 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:01:59,863 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:00,050 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:00,155 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '235#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:00,155 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:00,160 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:00,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-22 02:02:00,160 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751121894] [2022-11-22 02:02:00,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:00,162 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-22 02:02:00,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:00,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-22 02:02:00,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-22 02:02:00,163 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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) [2022-11-22 02:02:00,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:00,220 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2022-11-22 02:02:00,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:02:00,221 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 10 [2022-11-22 02:02:00,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:00,224 INFO L225 Difference]: With dead ends: 40 [2022-11-22 02:02:00,224 INFO L226 Difference]: Without dead ends: 32 [2022-11-22 02:02:00,227 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-22 02:02:00,229 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:00,231 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 15 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:02:00,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-22 02:02:00,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 14. [2022-11-22 02:02:00,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 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) [2022-11-22 02:02:00,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-11-22 02:02:00,240 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2022-11-22 02:02:00,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:00,240 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-11-22 02:02:00,240 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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) [2022-11-22 02:02:00,240 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-11-22 02:02:00,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-22 02:02:00,241 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:00,242 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:00,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 02:02:00,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:00,447 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:00,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:00,447 INFO L85 PathProgramCache]: Analyzing trace with hash 1870426530, now seen corresponding path program 2 times [2022-11-22 02:02:00,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:00,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [498213893] [2022-11-22 02:02:00,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:00,448 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:00,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:00,647 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:02:00,648 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:00,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [498213893] [2022-11-22 02:02:00,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [498213893] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:00,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1847804307] [2022-11-22 02:02:00,648 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:02:00,649 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:00,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:00,650 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:00,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 02:02:00,706 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-22 02:02:00,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:02:00,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-22 02:02:00,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:02:00,731 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:02:00,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:02:00,755 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:02:00,755 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1847804307] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:02:00,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [956433178] [2022-11-22 02:02:00,757 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-22 02:02:00,757 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:02:00,758 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:02:00,758 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:02:00,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:02:00,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:00,787 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 02:02:00,787 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:00,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:00,798 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:00,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:00,818 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:00,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:00,888 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:02:00,913 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:02:00,914 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:01,004 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:01,091 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:01,245 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '392#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:01,246 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:01,246 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:01,246 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2022-11-22 02:02:01,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765505273] [2022-11-22 02:02:01,246 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:01,247 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 02:02:01,248 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:01,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 02:02:01,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:02:01,249 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 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) [2022-11-22 02:02:01,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:01,329 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2022-11-22 02:02:01,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-22 02:02:01,329 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 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 13 [2022-11-22 02:02:01,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:01,331 INFO L225 Difference]: With dead ends: 28 [2022-11-22 02:02:01,331 INFO L226 Difference]: Without dead ends: 20 [2022-11-22 02:02:01,331 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2022-11-22 02:02:01,332 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:01,333 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 19 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:02:01,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-22 02:02:01,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-22 02:02:01,342 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) [2022-11-22 02:02:01,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-11-22 02:02:01,343 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 13 [2022-11-22 02:02:01,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:01,343 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-11-22 02:02:01,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 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) [2022-11-22 02:02:01,344 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-11-22 02:02:01,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-22 02:02:01,345 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:01,345 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:01,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 02:02:01,550 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:01,550 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:01,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:01,551 INFO L85 PathProgramCache]: Analyzing trace with hash -11023279, now seen corresponding path program 3 times [2022-11-22 02:02:01,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:01,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [868213116] [2022-11-22 02:02:01,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:01,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:01,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:01,650 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-22 02:02:01,650 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:01,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [868213116] [2022-11-22 02:02:01,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [868213116] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:01,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1555285917] [2022-11-22 02:02:01,651 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:02:01,651 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:01,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:01,652 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:01,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 02:02:01,722 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:02:01,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:02:01,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-22 02:02:01,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:02:01,742 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-22 02:02:01,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:02:01,804 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-22 02:02:01,804 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1555285917] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:02:01,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [991407009] [2022-11-22 02:02:01,807 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-22 02:02:01,807 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:02:01,807 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:02:01,808 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:02:01,808 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:02:01,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:01,856 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 02:02:01,856 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:01,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:01,870 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:01,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:01,892 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:01,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:01,938 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:02:01,962 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:02:01,962 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:02,038 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:02,150 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:02,321 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '590#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:02,321 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:02,321 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:02,321 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-22 02:02:02,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212663095] [2022-11-22 02:02:02,322 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:02,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-22 02:02:02,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:02,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-22 02:02:02,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2022-11-22 02:02:02,323 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 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) [2022-11-22 02:02:02,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:02,439 INFO L93 Difference]: Finished difference Result 76 states and 83 transitions. [2022-11-22 02:02:02,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-22 02:02:02,440 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 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 [2022-11-22 02:02:02,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:02,442 INFO L225 Difference]: With dead ends: 76 [2022-11-22 02:02:02,442 INFO L226 Difference]: Without dead ends: 62 [2022-11-22 02:02:02,443 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 42 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2022-11-22 02:02:02,443 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 63 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:02,444 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 24 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:02:02,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-22 02:02:02,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 26. [2022-11-22 02:02:02,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 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) [2022-11-22 02:02:02,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2022-11-22 02:02:02,452 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 19 [2022-11-22 02:02:02,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:02,452 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2022-11-22 02:02:02,453 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 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) [2022-11-22 02:02:02,453 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2022-11-22 02:02:02,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-22 02:02:02,453 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:02,454 INFO L195 NwaCegarLoop]: trace histogram [10, 5, 4, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:02,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 02:02:02,659 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-22 02:02:02,659 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:02,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:02,660 INFO L85 PathProgramCache]: Analyzing trace with hash -1846920175, now seen corresponding path program 4 times [2022-11-22 02:02:02,660 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:02,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073459012] [2022-11-22 02:02:02,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:02,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:02,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:02,928 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-22 02:02:02,928 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:02,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073459012] [2022-11-22 02:02:02,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073459012] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:02,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412560479] [2022-11-22 02:02:02,929 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:02:02,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:02,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:02,930 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:02,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 02:02:03,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:03,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 02:02:03,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:02:03,055 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-22 02:02:03,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:02:03,267 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-22 02:02:03,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412560479] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:02:03,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1301988405] [2022-11-22 02:02:03,272 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-22 02:02:03,273 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:02:03,273 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:02:03,273 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:02:03,273 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:02:03,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:03,299 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-22 02:02:03,299 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:03,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:03,324 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 02:02:03,325 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:03,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:03,348 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:03,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:03,390 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:02:03,412 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:02:03,412 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:03,512 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:03,644 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:03,843 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '907#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:03,843 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:03,843 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:03,843 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-11-22 02:02:03,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344043481] [2022-11-22 02:02:03,843 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:03,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-22 02:02:03,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:03,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-22 02:02:03,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2022-11-22 02:02:03,845 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 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) [2022-11-22 02:02:04,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:04,072 INFO L93 Difference]: Finished difference Result 160 states and 173 transitions. [2022-11-22 02:02:04,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-22 02:02:04,072 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 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 25 [2022-11-22 02:02:04,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:04,073 INFO L225 Difference]: With dead ends: 160 [2022-11-22 02:02:04,073 INFO L226 Difference]: Without dead ends: 146 [2022-11-22 02:02:04,074 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 54 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2022-11-22 02:02:04,075 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 219 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:04,075 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [219 Valid, 66 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:02:04,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-11-22 02:02:04,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 38. [2022-11-22 02:02:04,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 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) [2022-11-22 02:02:04,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2022-11-22 02:02:04,086 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 25 [2022-11-22 02:02:04,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:04,086 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2022-11-22 02:02:04,086 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 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) [2022-11-22 02:02:04,087 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2022-11-22 02:02:04,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-22 02:02:04,087 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:04,088 INFO L195 NwaCegarLoop]: trace histogram [22, 5, 4, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:04,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 02:02:04,292 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:04,293 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:04,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:04,293 INFO L85 PathProgramCache]: Analyzing trace with hash -385700975, now seen corresponding path program 5 times [2022-11-22 02:02:04,293 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:04,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [312223167] [2022-11-22 02:02:04,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:04,294 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:04,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:05,003 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-22 02:02:05,003 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:05,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [312223167] [2022-11-22 02:02:05,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [312223167] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:05,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133732576] [2022-11-22 02:02:05,003 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:02:05,004 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:05,004 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:05,005 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:05,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 02:02:05,121 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-22 02:02:05,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:02:05,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-22 02:02:05,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:02:05,169 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-22 02:02:05,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:02:05,332 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-22 02:02:05,333 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [133732576] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:02:05,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1124583876] [2022-11-22 02:02:05,335 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-22 02:02:05,335 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:02:05,335 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:02:05,336 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:02:05,336 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:02:05,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:05,365 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 02:02:05,365 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:05,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:05,378 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:05,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:05,399 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:05,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:05,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:05,458 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:02:05,459 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:05,517 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:05,579 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:05,871 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1436#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:05,871 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:05,872 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:05,872 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 8, 8] total 33 [2022-11-22 02:02:05,872 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504212440] [2022-11-22 02:02:05,872 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:05,872 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-22 02:02:05,872 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:05,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-22 02:02:05,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=781, Unknown=0, NotChecked=0, Total=1260 [2022-11-22 02:02:05,873 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 states have internal predecessors, (58), 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) [2022-11-22 02:02:06,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:06,613 INFO L93 Difference]: Finished difference Result 154 states and 185 transitions. [2022-11-22 02:02:06,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-22 02:02:06,614 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 states have internal predecessors, (58), 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 37 [2022-11-22 02:02:06,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:06,615 INFO L225 Difference]: With dead ends: 154 [2022-11-22 02:02:06,615 INFO L226 Difference]: Without dead ends: 92 [2022-11-22 02:02:06,617 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 94 SyntacticMatches, 5 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1151, Invalid=2389, Unknown=0, NotChecked=0, Total=3540 [2022-11-22 02:02:06,618 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 213 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:06,618 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 36 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:02:06,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-11-22 02:02:06,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2022-11-22 02:02:06,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.021978021978022) internal successors, (93), 91 states have internal predecessors, (93), 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) [2022-11-22 02:02:06,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2022-11-22 02:02:06,660 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 37 [2022-11-22 02:02:06,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:06,661 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2022-11-22 02:02:06,661 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 states have internal predecessors, (58), 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) [2022-11-22 02:02:06,661 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2022-11-22 02:02:06,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-11-22 02:02:06,663 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:06,663 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:06,675 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 02:02:06,875 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:06,876 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:06,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:06,876 INFO L85 PathProgramCache]: Analyzing trace with hash -1548067895, now seen corresponding path program 6 times [2022-11-22 02:02:06,876 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:06,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051035630] [2022-11-22 02:02:06,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:06,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:06,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:08,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-22 02:02:08,134 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:08,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051035630] [2022-11-22 02:02:08,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1051035630] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:08,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [155352306] [2022-11-22 02:02:08,135 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:02:08,135 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:08,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:08,136 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:08,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 02:02:08,342 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:02:08,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:02:08,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 440 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 02:02:08,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:02:08,431 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-22 02:02:08,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:02:09,713 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-22 02:02:09,714 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [155352306] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:02:09,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [50235332] [2022-11-22 02:02:09,716 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-22 02:02:09,716 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:02:09,717 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:02:09,717 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:02:09,717 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:02:09,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:09,753 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 02:02:09,753 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:09,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:09,765 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:09,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:09,781 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:09,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:09,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:09,838 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:02:09,838 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:09,875 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:09,936 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:11,023 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2455#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:11,023 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:11,023 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:11,023 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 60 [2022-11-22 02:02:11,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566817106] [2022-11-22 02:02:11,024 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:11,024 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-22 02:02:11,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:11,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-22 02:02:11,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1839, Invalid=2193, Unknown=0, NotChecked=0, Total=4032 [2022-11-22 02:02:11,027 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 states have internal predecessors, (68), 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) [2022-11-22 02:02:11,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:11,686 INFO L93 Difference]: Finished difference Result 364 states and 395 transitions. [2022-11-22 02:02:11,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-22 02:02:11,687 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 states have internal predecessors, (68), 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 91 [2022-11-22 02:02:11,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:11,688 INFO L225 Difference]: With dead ends: 364 [2022-11-22 02:02:11,688 INFO L226 Difference]: Without dead ends: 302 [2022-11-22 02:02:11,690 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 210 SyntacticMatches, 29 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2896 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1839, Invalid=2193, Unknown=0, NotChecked=0, Total=4032 [2022-11-22 02:02:11,691 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 514 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 514 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:11,691 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [514 Valid, 111 Invalid, 412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:02:11,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2022-11-22 02:02:11,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 122. [2022-11-22 02:02:11,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0165289256198347) internal successors, (123), 121 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) [2022-11-22 02:02:11,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2022-11-22 02:02:11,724 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 91 [2022-11-22 02:02:11,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:11,724 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2022-11-22 02:02:11,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 states have internal predecessors, (68), 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) [2022-11-22 02:02:11,725 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2022-11-22 02:02:11,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-22 02:02:11,727 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:11,727 INFO L195 NwaCegarLoop]: trace histogram [58, 29, 28, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:11,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 02:02:11,933 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:11,933 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:11,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:11,934 INFO L85 PathProgramCache]: Analyzing trace with hash -1453217143, now seen corresponding path program 7 times [2022-11-22 02:02:11,934 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:11,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789928165] [2022-11-22 02:02:11,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:11,934 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:12,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:15,310 INFO L134 CoverageAnalysis]: Checked inductivity of 2523 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-22 02:02:15,310 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:15,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789928165] [2022-11-22 02:02:15,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789928165] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:15,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81086123] [2022-11-22 02:02:15,310 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:02:15,311 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:15,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:15,315 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:15,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 02:02:15,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:15,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 710 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-22 02:02:15,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:02:15,684 INFO L134 CoverageAnalysis]: Checked inductivity of 2523 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-22 02:02:15,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:02:20,100 INFO L134 CoverageAnalysis]: Checked inductivity of 2523 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-22 02:02:20,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81086123] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:02:20,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [842321144] [2022-11-22 02:02:20,102 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-22 02:02:20,102 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:02:20,102 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:02:20,102 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:02:20,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:02:20,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:20,128 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-22 02:02:20,128 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:20,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:20,151 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 02:02:20,152 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:20,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:20,168 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:20,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:02:20,215 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:02:20,244 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:02:20,244 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:20,320 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:02:20,444 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:22,331 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4020#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:22,331 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:22,331 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:22,331 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 120 [2022-11-22 02:02:22,331 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689597015] [2022-11-22 02:02:22,331 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:22,332 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2022-11-22 02:02:22,332 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:22,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2022-11-22 02:02:22,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7269, Invalid=7983, Unknown=0, NotChecked=0, Total=15252 [2022-11-22 02:02:22,340 INFO L87 Difference]: Start difference. First operand 122 states and 123 transitions. Second operand has 121 states, 121 states have (on average 1.0578512396694215) internal successors, (128), 120 states have internal predecessors, (128), 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) [2022-11-22 02:02:26,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:26,139 INFO L93 Difference]: Finished difference Result 784 states and 845 transitions. [2022-11-22 02:02:26,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2022-11-22 02:02:26,140 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 1.0578512396694215) internal successors, (128), 120 states have internal predecessors, (128), 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 121 [2022-11-22 02:02:26,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:26,142 INFO L225 Difference]: With dead ends: 784 [2022-11-22 02:02:26,143 INFO L226 Difference]: Without dead ends: 722 [2022-11-22 02:02:26,147 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 270 SyntacticMatches, 29 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5896 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=7269, Invalid=7983, Unknown=0, NotChecked=0, Total=15252 [2022-11-22 02:02:26,147 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2261 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 646 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2261 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 1104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 646 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:26,148 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2261 Valid, 288 Invalid, 1104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [646 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-22 02:02:26,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 722 states. [2022-11-22 02:02:26,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 722 to 182. [2022-11-22 02:02:26,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 181 states have (on average 1.011049723756906) internal successors, (183), 181 states have internal predecessors, (183), 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) [2022-11-22 02:02:26,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 183 transitions. [2022-11-22 02:02:26,192 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 183 transitions. Word has length 121 [2022-11-22 02:02:26,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:26,192 INFO L495 AbstractCegarLoop]: Abstraction has 182 states and 183 transitions. [2022-11-22 02:02:26,193 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 1.0578512396694215) internal successors, (128), 120 states have internal predecessors, (128), 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) [2022-11-22 02:02:26,193 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 183 transitions. [2022-11-22 02:02:26,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2022-11-22 02:02:26,196 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:26,196 INFO L195 NwaCegarLoop]: trace histogram [118, 29, 28, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:26,212 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 02:02:26,404 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-22 02:02:26,404 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:26,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:26,405 INFO L85 PathProgramCache]: Analyzing trace with hash 346642441, now seen corresponding path program 8 times [2022-11-22 02:02:26,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:26,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368894906] [2022-11-22 02:02:26,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:26,405 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:26,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:37,302 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 7021 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-22 02:02:37,302 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:37,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368894906] [2022-11-22 02:02:37,302 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368894906] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:37,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1229676285] [2022-11-22 02:02:37,303 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:02:37,303 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:37,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:37,310 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:37,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 02:07:56,534 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2022-11-22 02:07:56,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:07:56,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 692 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-22 02:07:56,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:56,841 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 7021 trivial. 0 not checked. [2022-11-22 02:07:56,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:08:00,921 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 7021 trivial. 0 not checked. [2022-11-22 02:08:00,921 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1229676285] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:08:00,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [372332277] [2022-11-22 02:08:00,927 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-22 02:08:00,928 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:08:00,928 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:08:00,928 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:08:00,929 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:08:00,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:00,963 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 02:08:00,964 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:08:00,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:00,974 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:08:00,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:00,996 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:08:01,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:08:01,049 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:08:01,076 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:08:01,077 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:08:01,176 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:08:01,317 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:08:05,827 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6637#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:08:05,827 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:08:05,827 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:08:05,828 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [120, 32, 32] total 153 [2022-11-22 02:08:05,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159710872] [2022-11-22 02:08:05,828 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:08:05,829 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 153 states [2022-11-22 02:08:05,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:08:05,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2022-11-22 02:08:05,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11339, Invalid=12841, Unknown=0, NotChecked=0, Total=24180 [2022-11-22 02:08:05,841 INFO L87 Difference]: Start difference. First operand 182 states and 183 transitions. Second operand has 153 states, 153 states have (on average 1.6339869281045751) internal successors, (250), 153 states have internal predecessors, (250), 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) [2022-11-22 02:08:22,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:08:22,536 INFO L93 Difference]: Finished difference Result 754 states and 905 transitions. [2022-11-22 02:08:22,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 270 states. [2022-11-22 02:08:22,537 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 153 states have (on average 1.6339869281045751) internal successors, (250), 153 states have internal predecessors, (250), 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 181 [2022-11-22 02:08:22,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:08:22,540 INFO L225 Difference]: With dead ends: 754 [2022-11-22 02:08:22,540 INFO L226 Difference]: Without dead ends: 452 [2022-11-22 02:08:22,551 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 781 GetRequests, 478 SyntacticMatches, 29 SemanticMatches, 274 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14015 ImplicationChecksByTransitivity, 23.4s TimeCoverageRelationStatistics Valid=26219, Invalid=49681, Unknown=0, NotChecked=0, Total=75900 [2022-11-22 02:08:22,552 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1236 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 1018 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1236 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 1601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1018 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:08:22,553 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1236 Valid, 143 Invalid, 1601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1018 Valid, 583 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-22 02:08:22,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2022-11-22 02:08:22,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 452. [2022-11-22 02:08:22,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 451 states have (on average 1.0044345898004434) internal successors, (453), 451 states have internal predecessors, (453), 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) [2022-11-22 02:08:22,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 453 transitions. [2022-11-22 02:08:22,939 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 453 transitions. Word has length 181 [2022-11-22 02:08:22,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:08:22,939 INFO L495 AbstractCegarLoop]: Abstraction has 452 states and 453 transitions. [2022-11-22 02:08:22,940 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 153 states, 153 states have (on average 1.6339869281045751) internal successors, (250), 153 states have internal predecessors, (250), 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) [2022-11-22 02:08:22,940 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 453 transitions. [2022-11-22 02:08:22,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 452 [2022-11-22 02:08:22,950 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:08:22,950 INFO L195 NwaCegarLoop]: trace histogram [149, 148, 148, 1, 1, 1, 1, 1, 1] [2022-11-22 02:08:22,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 02:08:23,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-22 02:08:23,167 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:08:23,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:08:23,167 INFO L85 PathProgramCache]: Analyzing trace with hash -1051002591, now seen corresponding path program 9 times [2022-11-22 02:08:23,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:08:23,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962767122] [2022-11-22 02:08:23,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:08:23,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:08:23,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:08:43,748 INFO L134 CoverageAnalysis]: Checked inductivity of 33078 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-22 02:08:43,748 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:08:43,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962767122] [2022-11-22 02:08:43,749 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1962767122] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:08:43,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582656655] [2022-11-22 02:08:43,749 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:08:43,749 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:08:43,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:08:43,750 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:08:43,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 02:08:44,506 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:08:44,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:08:44,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 2120 conjuncts, 150 conjunts are in the unsatisfiable core [2022-11-22 02:08:44,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:08:44,912 INFO L134 CoverageAnalysis]: Checked inductivity of 33078 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-22 02:08:44,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:09:14,675 INFO L134 CoverageAnalysis]: Checked inductivity of 33078 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-22 02:09:14,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1582656655] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:09:14,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [909471756] [2022-11-22 02:09:14,678 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-22 02:09:14,678 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:09:14,678 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:09:14,679 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:09:14,679 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:09:14,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:09:14,709 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-22 02:09:14,710 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:09:14,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:09:14,736 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 02:09:14,736 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:09:14,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:09:14,760 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:09:14,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:09:14,808 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-22 02:09:14,838 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-22 02:09:14,839 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:09:14,913 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:09:14,982 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:09:37,623 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11712#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:09:37,623 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:09:37,623 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:09:37,624 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [150, 150, 150] total 300 [2022-11-22 02:09:37,624 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683813272] [2022-11-22 02:09:37,625 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:09:37,626 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 301 states [2022-11-22 02:09:37,626 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:09:37,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 301 interpolants. [2022-11-22 02:09:37,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45159, Invalid=46953, Unknown=0, NotChecked=0, Total=92112 [2022-11-22 02:09:37,654 INFO L87 Difference]: Start difference. First operand 452 states and 453 transitions. Second operand has 301 states, 301 states have (on average 1.0232558139534884) internal successors, (308), 300 states have internal predecessors, (308), 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) [2022-11-22 02:10:49,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:10:49,781 INFO L93 Difference]: Finished difference Result 1804 states and 1955 transitions. [2022-11-22 02:10:49,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 300 states. [2022-11-22 02:10:49,792 INFO L78 Accepts]: Start accepts. Automaton has has 301 states, 301 states have (on average 1.0232558139534884) internal successors, (308), 300 states have internal predecessors, (308), 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 451 [2022-11-22 02:10:49,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:10:49,797 INFO L225 Difference]: With dead ends: 1804 [2022-11-22 02:10:49,798 INFO L226 Difference]: Without dead ends: 1502 [2022-11-22 02:10:49,803 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1501 GetRequests, 1050 SyntacticMatches, 149 SemanticMatches, 302 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68536 ImplicationChecksByTransitivity, 62.0s TimeCoverageRelationStatistics Valid=45159, Invalid=46953, Unknown=0, NotChecked=0, Total=92112 [2022-11-22 02:10:49,804 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4664 mSDsluCounter, 465 mSDsCounter, 0 mSdLazyCounter, 1058 mSolverCounterSat, 1810 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4664 SdHoareTripleChecker+Valid, 468 SdHoareTripleChecker+Invalid, 2868 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1810 IncrementalHoareTripleChecker+Valid, 1058 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:10:49,804 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4664 Valid, 468 Invalid, 2868 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1810 Valid, 1058 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-22 02:10:49,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1502 states. [2022-11-22 02:10:50,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1502 to 602. [2022-11-22 02:10:50,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 602 states, 601 states have (on average 1.0033277870216306) internal successors, (603), 601 states have internal predecessors, (603), 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) [2022-11-22 02:10:50,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 602 states to 602 states and 603 transitions. [2022-11-22 02:10:50,224 INFO L78 Accepts]: Start accepts. Automaton has 602 states and 603 transitions. Word has length 451 [2022-11-22 02:10:50,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:10:50,225 INFO L495 AbstractCegarLoop]: Abstraction has 602 states and 603 transitions. [2022-11-22 02:10:50,225 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 301 states, 301 states have (on average 1.0232558139534884) internal successors, (308), 300 states have internal predecessors, (308), 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) [2022-11-22 02:10:50,226 INFO L276 IsEmpty]: Start isEmpty. Operand 602 states and 603 transitions. [2022-11-22 02:10:50,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 602 [2022-11-22 02:10:50,241 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:10:50,242 INFO L195 NwaCegarLoop]: trace histogram [298, 149, 148, 1, 1, 1, 1, 1, 1] [2022-11-22 02:10:50,252 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 02:10:50,451 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:10:50,451 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:10:50,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:10:50,452 INFO L85 PathProgramCache]: Analyzing trace with hash -281697567, now seen corresponding path program 10 times [2022-11-22 02:10:50,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:10:50,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [203359055] [2022-11-22 02:10:50,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:10:50,452 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:10:51,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:12:02,240 INFO L134 CoverageAnalysis]: Checked inductivity of 66603 backedges. 0 proven. 44551 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-22 02:12:02,240 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:12:02,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [203359055] [2022-11-22 02:12:02,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [203359055] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:12:02,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [799140784] [2022-11-22 02:12:02,241 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:12:02,241 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:12:02,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:12:02,247 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:12:02,266 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53833fc5-d87a-4957-9438-6eaabe2f118e/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 02:12:03,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:12:03,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 3470 conjuncts, 300 conjunts are in the unsatisfiable core [2022-11-22 02:12:03,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:12:04,115 INFO L134 CoverageAnalysis]: Checked inductivity of 66603 backedges. 0 proven. 44551 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-22 02:12:04,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:14:15,372 INFO L134 CoverageAnalysis]: Checked inductivity of 66603 backedges. 0 proven. 44551 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-22 02:14:15,372 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [799140784] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:14:15,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1997387451] [2022-11-22 02:14:15,374 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-22 02:14:15,374 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:14:15,374 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:14:15,375 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:14:15,375 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:14:15,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:14:15,400 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-22 02:14:15,401 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:14:15,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:14:15,413 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:14:15,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:14:15,435 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:14:15,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:14:15,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-22 02:14:15,500 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-22 02:14:15,501 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:14:15,545 INFO L350 Elim1Store]: Elim1 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 [2022-11-22 02:14:15,622 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:15:05,284 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19517#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:15:05,285 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:15:05,285 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:15:05,285 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [300, 300, 300] total 600 [2022-11-22 02:15:05,286 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338822805] [2022-11-22 02:15:05,286 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:15:05,288 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 601 states [2022-11-22 02:15:05,289 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:15:05,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 601 interpolants. [2022-11-22 02:15:05,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180309, Invalid=183903, Unknown=0, NotChecked=0, Total=364212 [2022-11-22 02:15:05,334 INFO L87 Difference]: Start difference. First operand 602 states and 603 transitions. Second operand has 601 states, 601 states have (on average 1.0116472545757071) internal successors, (608), 600 states have internal predecessors, (608), 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)