./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/array_2-2-simple.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/array_2-2-simple.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P --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 c189c1cb91ea61745da6126e2d9c114f6ae511079741dc75bc227de256009336 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:26:57,887 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:26:57,890 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:26:57,929 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:26:57,930 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:26:57,932 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:26:57,934 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:26:57,936 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:26:57,939 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:26:57,940 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:26:57,941 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:26:57,943 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:26:57,944 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:26:57,945 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:26:57,947 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:26:57,949 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:26:57,950 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:26:57,951 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:26:57,961 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:26:57,966 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:26:57,968 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:26:57,972 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:26:57,974 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:26:57,975 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:26:57,979 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:26:57,980 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:26:57,980 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:26:57,981 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:26:57,982 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:26:57,983 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:26:57,984 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:26:57,985 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:26:57,986 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:26:57,987 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:26:57,988 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:26:57,989 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:26:57,990 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:26:57,990 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:26:57,991 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:26:57,992 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:26:57,993 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:26:57,995 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:26:58,039 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:26:58,040 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:26:58,041 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:26:58,041 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:26:58,049 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:26:58,050 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:26:58,050 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:26:58,050 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:26:58,051 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:26:58,051 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:26:58,052 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:26:58,052 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:26:58,052 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:26:58,053 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:26:58,053 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:26:58,053 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:26:58,053 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:26:58,054 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:26:58,055 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:26:58,055 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:26:58,055 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:26:58,055 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:26:58,056 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:26:58,056 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:26:58,056 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:26:58,056 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:26:58,058 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:26:58,058 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:26:58,059 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:26:58,059 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:26:58,059 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:26:58,059 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:26:58,060 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:26:58,060 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:26:58,060 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:26:58,061 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:26:58,061 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:26:58,061 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:26:58,061 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:26:58,061 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:26:58,062 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:26:58,062 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c189c1cb91ea61745da6126e2d9c114f6ae511079741dc75bc227de256009336 [2021-11-21 01:26:58,435 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:26:58,470 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:26:58,473 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:26:58,474 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:26:58,476 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:26:58,477 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/loop-acceleration/array_2-2-simple.i [2021-11-21 01:26:58,547 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/data/5cbf445c1/65a6768035144496a6d30eef0d2ab4a2/FLAG8adfbbb3f [2021-11-21 01:26:59,053 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:26:59,053 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/sv-benchmarks/c/loop-acceleration/array_2-2-simple.i [2021-11-21 01:26:59,065 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/data/5cbf445c1/65a6768035144496a6d30eef0d2ab4a2/FLAG8adfbbb3f [2021-11-21 01:26:59,400 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/data/5cbf445c1/65a6768035144496a6d30eef0d2ab4a2 [2021-11-21 01:26:59,402 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:26:59,404 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:26:59,408 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:26:59,408 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:26:59,413 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:26:59,413 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:26:59" (1/1) ... [2021-11-21 01:26:59,416 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f826279 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:59, skipping insertion in model container [2021-11-21 01:26:59,417 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:26:59" (1/1) ... [2021-11-21 01:26:59,425 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:26:59,442 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:26:59,615 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/sv-benchmarks/c/loop-acceleration/array_2-2-simple.i[809,822] [2021-11-21 01:26:59,630 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:26:59,639 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:26:59,669 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/sv-benchmarks/c/loop-acceleration/array_2-2-simple.i[809,822] [2021-11-21 01:26:59,675 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:26:59,689 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:26:59,689 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:59 WrapperNode [2021-11-21 01:26:59,689 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:26:59,691 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:26:59,691 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:26:59,691 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:26:59,699 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:59" (1/1) ... [2021-11-21 01:26:59,711 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:59" (1/1) ... [2021-11-21 01:26:59,730 INFO L137 Inliner]: procedures = 16, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 44 [2021-11-21 01:26:59,730 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:26:59,731 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:26:59,732 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:26:59,732 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:26:59,740 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:59" (1/1) ... [2021-11-21 01:26:59,741 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:59" (1/1) ... [2021-11-21 01:26:59,743 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:59" (1/1) ... [2021-11-21 01:26:59,743 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:59" (1/1) ... [2021-11-21 01:26:59,748 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:59" (1/1) ... [2021-11-21 01:26:59,752 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:59" (1/1) ... [2021-11-21 01:26:59,753 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:59" (1/1) ... [2021-11-21 01:26:59,755 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:26:59,756 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:26:59,756 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:26:59,756 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:26:59,757 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:59" (1/1) ... [2021-11-21 01:26:59,769 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:26:59,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:59,791 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:26:59,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:26:59,828 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:26:59,829 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:26:59,829 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2021-11-21 01:26:59,829 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:26:59,829 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:26:59,830 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:26:59,830 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:26:59,830 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:26:59,830 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:26:59,905 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:26:59,908 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:27:00,093 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:27:00,124 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:27:00,126 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 01:27:00,129 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:27:00 BoogieIcfgContainer [2021-11-21 01:27:00,129 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:27:00,132 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:27:00,132 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:27:00,136 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:27:00,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:26:59" (1/3) ... [2021-11-21 01:27:00,137 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b4effb0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:27:00, skipping insertion in model container [2021-11-21 01:27:00,138 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:59" (2/3) ... [2021-11-21 01:27:00,138 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b4effb0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:27:00, skipping insertion in model container [2021-11-21 01:27:00,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:27:00" (3/3) ... [2021-11-21 01:27:00,144 INFO L111 eAbstractionObserver]: Analyzing ICFG array_2-2-simple.i [2021-11-21 01:27:00,150 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:27:00,151 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:27:00,220 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:27:00,232 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:27:00,232 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:27:00,256 INFO L276 IsEmpty]: Start isEmpty. Operand has 7 states, 5 states have (on average 1.6) 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) [2021-11-21 01:27:00,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-21 01:27:00,262 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:00,263 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-21 01:27:00,263 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:00,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:00,271 INFO L85 PathProgramCache]: Analyzing trace with hash 1941830, now seen corresponding path program 1 times [2021-11-21 01:27:00,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:00,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653103680] [2021-11-21 01:27:00,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:00,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:00,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:00,599 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:00,600 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:00,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653103680] [2021-11-21 01:27:00,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1653103680] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:27:00,601 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:27:00,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:27:00,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240610752] [2021-11-21 01:27:00,604 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:27:00,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:27:00,609 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:00,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:27:00,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:27:00,683 INFO L87 Difference]: Start difference. First operand has 7 states, 5 states have (on average 1.6) 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) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:00,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:00,711 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2021-11-21 01:27:00,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:27:00,713 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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 4 [2021-11-21 01:27:00,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:00,721 INFO L225 Difference]: With dead ends: 13 [2021-11-21 01:27:00,721 INFO L226 Difference]: Without dead ends: 6 [2021-11-21 01:27:00,724 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:27:00,729 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:00,730 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:27:00,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2021-11-21 01:27:00,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2021-11-21 01:27:00,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 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) [2021-11-21 01:27:00,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2021-11-21 01:27:00,773 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2021-11-21 01:27:00,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:00,774 INFO L470 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2021-11-21 01:27:00,774 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:00,774 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2021-11-21 01:27:00,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 01:27:00,775 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:00,775 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 01:27:00,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:27:00,776 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:00,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:00,777 INFO L85 PathProgramCache]: Analyzing trace with hash 60064071, now seen corresponding path program 1 times [2021-11-21 01:27:00,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:00,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718746774] [2021-11-21 01:27:00,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:00,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:00,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:00,870 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:00,871 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:00,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718746774] [2021-11-21 01:27:00,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1718746774] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:00,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2001508348] [2021-11-21 01:27:00,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:00,872 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:00,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:00,879 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:00,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:27:00,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:00,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:27:00,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:01,032 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:01,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:01,067 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:01,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2001508348] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:01,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [805456338] [2021-11-21 01:27:01,090 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 01:27:01,090 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:01,095 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:01,102 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:01,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:01,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:01,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:01,308 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:27:01,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-21 01:27:01,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:01,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:01,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:01,402 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:01,474 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:27:01,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 01:27:01,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:01,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:01,547 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:01,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 5 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:27:01,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:01,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:01,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 48 [2021-11-21 01:27:01,953 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-21 01:27:01,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 257 treesize of output 246 [2021-11-21 01:27:02,690 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:02,703 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:27:02,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 01:27:02,958 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:03,092 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:03,092 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:03,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-21 01:27:03,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426565964] [2021-11-21 01:27:03,094 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:03,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:27:03,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:03,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:27:03,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:27:03,098 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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) [2021-11-21 01:27:03,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:03,119 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2021-11-21 01:27:03,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:27:03,120 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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) Word has length 5 [2021-11-21 01:27:03,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:03,121 INFO L225 Difference]: With dead ends: 12 [2021-11-21 01:27:03,121 INFO L226 Difference]: Without dead ends: 9 [2021-11-21 01:27:03,122 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:27:03,129 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:03,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:27:03,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-21 01:27:03,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-21 01:27:03,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:03,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2021-11-21 01:27:03,137 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2021-11-21 01:27:03,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:03,138 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2021-11-21 01:27:03,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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) [2021-11-21 01:27:03,138 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2021-11-21 01:27:03,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 01:27:03,140 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:03,140 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2021-11-21 01:27:03,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:03,362 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:03,362 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:03,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:03,363 INFO L85 PathProgramCache]: Analyzing trace with hash -1764353658, now seen corresponding path program 2 times [2021-11-21 01:27:03,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:03,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [116967089] [2021-11-21 01:27:03,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:03,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:03,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:03,432 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:03,433 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:03,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [116967089] [2021-11-21 01:27:03,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [116967089] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:03,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1103196254] [2021-11-21 01:27:03,434 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:27:03,434 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:03,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:03,435 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:03,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:27:03,483 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:27:03,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:27:03,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:27:03,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:03,518 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:03,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:03,594 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:03,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1103196254] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:03,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [327875200] [2021-11-21 01:27:03,598 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 01:27:03,598 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:03,598 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:03,598 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:03,599 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:03,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:03,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:03,630 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:03,640 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-21 01:27:03,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:27:03,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:03,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:03,691 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:27:03,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-21 01:27:03,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:03,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:03,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:03,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:03,771 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:27:03,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 01:27:03,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:03,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:03,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 48 [2021-11-21 01:27:04,069 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-21 01:27:04,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 257 treesize of output 246 [2021-11-21 01:27:04,674 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:04,685 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:27:04,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 01:27:04,922 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:05,051 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:05,052 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:05,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-21 01:27:05,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282588338] [2021-11-21 01:27:05,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:05,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:27:05,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:05,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:27:05,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2021-11-21 01:27:05,053 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:05,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:05,085 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2021-11-21 01:27:05,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:27:05,086 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-21 01:27:05,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:05,087 INFO L225 Difference]: With dead ends: 18 [2021-11-21 01:27:05,087 INFO L226 Difference]: Without dead ends: 15 [2021-11-21 01:27:05,088 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2021-11-21 01:27:05,089 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:05,089 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:27:05,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-21 01:27:05,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-21 01:27:05,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 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) [2021-11-21 01:27:05,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2021-11-21 01:27:05,094 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 8 [2021-11-21 01:27:05,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:05,094 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2021-11-21 01:27:05,095 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:05,095 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2021-11-21 01:27:05,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 01:27:05,096 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:05,096 INFO L514 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1] [2021-11-21 01:27:05,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:05,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:05,322 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:05,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:05,323 INFO L85 PathProgramCache]: Analyzing trace with hash 193090022, now seen corresponding path program 3 times [2021-11-21 01:27:05,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:05,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843322246] [2021-11-21 01:27:05,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:05,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:05,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:05,520 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:05,520 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:05,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843322246] [2021-11-21 01:27:05,520 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843322246] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:05,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915964353] [2021-11-21 01:27:05,521 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:27:05,521 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:05,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:05,522 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:05,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:27:05,566 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:27:05,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:27:05,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:27:05,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:05,630 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:05,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:05,875 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:05,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1915964353] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:05,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [105048570] [2021-11-21 01:27:05,877 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 01:27:05,878 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:05,878 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:05,878 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:05,878 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:05,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:05,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:05,932 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:27:05,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-21 01:27:05,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:05,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:05,971 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:05,981 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-21 01:27:05,981 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:27:06,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:06,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:06,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:06,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:06,049 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:27:06,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 01:27:06,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:06,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:06,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 48 [2021-11-21 01:27:06,278 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-21 01:27:06,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 261 treesize of output 248 [2021-11-21 01:27:06,845 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:06,854 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:27:06,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 01:27:07,058 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:07,206 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:07,206 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:07,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-21 01:27:07,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440017722] [2021-11-21 01:27:07,206 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:07,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 01:27:07,207 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:07,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 01:27:07,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:27:07,208 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:07,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:07,259 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2021-11-21 01:27:07,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-21 01:27:07,260 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-21 01:27:07,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:07,261 INFO L225 Difference]: With dead ends: 30 [2021-11-21 01:27:07,261 INFO L226 Difference]: Without dead ends: 27 [2021-11-21 01:27:07,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:27:07,263 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:07,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 4 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:27:07,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-21 01:27:07,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-21 01:27:07,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 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) [2021-11-21 01:27:07,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2021-11-21 01:27:07,269 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 14 [2021-11-21 01:27:07,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:07,270 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2021-11-21 01:27:07,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:07,270 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2021-11-21 01:27:07,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 01:27:07,271 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:07,271 INFO L514 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1] [2021-11-21 01:27:07,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:07,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:07,489 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:07,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:07,489 INFO L85 PathProgramCache]: Analyzing trace with hash 1874160294, now seen corresponding path program 4 times [2021-11-21 01:27:07,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:07,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308475590] [2021-11-21 01:27:07,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:07,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:07,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:07,925 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:07,925 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:07,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308475590] [2021-11-21 01:27:07,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308475590] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:07,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052060615] [2021-11-21 01:27:07,925 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:27:07,925 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:07,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:07,926 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:07,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:27:07,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:07,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 01:27:07,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:08,074 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:08,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:08,933 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:08,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2052060615] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:08,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [913334178] [2021-11-21 01:27:08,936 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 01:27:08,936 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:08,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:08,936 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:08,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:08,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:08,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:08,985 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:27:08,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-21 01:27:09,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:09,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:09,021 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:09,031 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-21 01:27:09,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:27:09,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:09,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:09,110 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:27:09,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 01:27:09,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:09,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:09,209 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 48 [2021-11-21 01:27:09,366 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-21 01:27:09,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 261 treesize of output 248 [2021-11-21 01:27:09,936 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:09,944 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:27:09,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 01:27:10,124 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:10,289 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:10,290 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:10,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2021-11-21 01:27:10,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756842552] [2021-11-21 01:27:10,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:10,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-21 01:27:10,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:10,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-21 01:27:10,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1185, Invalid=1467, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:27:10,294 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:10,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:10,388 INFO L93 Difference]: Finished difference Result 54 states and 77 transitions. [2021-11-21 01:27:10,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-21 01:27:10,389 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-21 01:27:10,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:10,390 INFO L225 Difference]: With dead ends: 54 [2021-11-21 01:27:10,390 INFO L226 Difference]: Without dead ends: 51 [2021-11-21 01:27:10,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1185, Invalid=1467, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:27:10,393 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:10,393 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:27:10,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-21 01:27:10,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-21 01:27:10,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:10,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2021-11-21 01:27:10,402 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 26 [2021-11-21 01:27:10,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:10,402 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2021-11-21 01:27:10,403 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:10,403 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2021-11-21 01:27:10,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-21 01:27:10,404 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:10,405 INFO L514 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1] [2021-11-21 01:27:10,449 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:10,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:10,619 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:10,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:10,619 INFO L85 PathProgramCache]: Analyzing trace with hash -1326564314, now seen corresponding path program 5 times [2021-11-21 01:27:10,619 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:10,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693864238] [2021-11-21 01:27:10,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:10,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:10,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:11,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:11,688 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:11,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693864238] [2021-11-21 01:27:11,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [693864238] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:11,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122903052] [2021-11-21 01:27:11,688 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:27:11,688 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:11,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:11,689 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:11,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:27:13,187 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-21 01:27:13,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:27:13,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-21 01:27:13,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:13,399 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:13,399 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:16,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:16,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122903052] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:16,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1306135970] [2021-11-21 01:27:16,251 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 01:27:16,251 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:16,252 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:16,252 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:16,252 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:16,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:16,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:16,301 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:27:16,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-21 01:27:16,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:16,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:16,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:16,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:16,377 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:27:16,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 01:27:16,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:16,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:16,413 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:16,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 5 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:27:16,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:16,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:16,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 48 [2021-11-21 01:27:16,620 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-21 01:27:16,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 257 treesize of output 246 [2021-11-21 01:27:17,138 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:17,158 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:27:17,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 01:27:17,348 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:17,523 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:17,523 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:17,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 96 [2021-11-21 01:27:17,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703788340] [2021-11-21 01:27:17,524 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:17,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-21 01:27:17,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:17,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-21 01:27:17,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4665, Invalid=5235, Unknown=0, NotChecked=0, Total=9900 [2021-11-21 01:27:17,540 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:17,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:17,849 INFO L93 Difference]: Finished difference Result 102 states and 149 transitions. [2021-11-21 01:27:17,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-21 01:27:17,852 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 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 50 [2021-11-21 01:27:17,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:17,865 INFO L225 Difference]: With dead ends: 102 [2021-11-21 01:27:17,866 INFO L226 Difference]: Without dead ends: 99 [2021-11-21 01:27:17,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=4665, Invalid=5235, Unknown=0, NotChecked=0, Total=9900 [2021-11-21 01:27:17,873 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:17,874 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:27:17,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-21 01:27:17,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-11-21 01:27:17,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.010204081632653) internal successors, (99), 98 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:17,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2021-11-21 01:27:17,903 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 50 [2021-11-21 01:27:17,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:17,904 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2021-11-21 01:27:17,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:17,904 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2021-11-21 01:27:17,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-21 01:27:17,910 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:17,910 INFO L514 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1] [2021-11-21 01:27:17,937 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-21 01:27:18,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 01:27:18,115 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:18,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:18,115 INFO L85 PathProgramCache]: Analyzing trace with hash 1575640870, now seen corresponding path program 6 times [2021-11-21 01:27:18,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:18,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272796807] [2021-11-21 01:27:18,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:18,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:18,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:21,532 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:21,532 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:21,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272796807] [2021-11-21 01:27:21,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272796807] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:21,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175684817] [2021-11-21 01:27:21,533 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:27:21,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:21,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:21,534 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:21,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:27:21,701 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:27:21,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:27:21,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 614 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-21 01:27:21,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:22,045 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:22,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:27:31,477 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:31,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [175684817] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:27:31,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [473557219] [2021-11-21 01:27:31,479 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 01:27:31,480 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:27:31,480 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:27:31,480 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:27:31,480 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:27:31,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:31,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:31,535 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:27:31,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 01:27:31,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:31,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:31,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-21 01:27:31,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:31,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:31,605 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:31,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 5 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:27:31,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:31,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:27:31,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 61 treesize of output 58 [2021-11-21 01:27:31,841 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-21 01:27:31,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 274 treesize of output 261 [2021-11-21 01:27:32,455 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:27:32,464 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:27:32,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 01:27:32,656 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:32,945 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:27:32,945 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:32,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 192 [2021-11-21 01:27:32,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459279408] [2021-11-21 01:27:32,945 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:27:32,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2021-11-21 01:27:32,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:32,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2021-11-21 01:27:32,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18537, Invalid=19683, Unknown=0, NotChecked=0, Total=38220 [2021-11-21 01:27:32,966 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:33,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:27:33,523 INFO L93 Difference]: Finished difference Result 198 states and 293 transitions. [2021-11-21 01:27:33,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2021-11-21 01:27:33,524 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 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 98 [2021-11-21 01:27:33,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:27:33,527 INFO L225 Difference]: With dead ends: 198 [2021-11-21 01:27:33,527 INFO L226 Difference]: Without dead ends: 195 [2021-11-21 01:27:33,531 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1231 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=18537, Invalid=19683, Unknown=0, NotChecked=0, Total=38220 [2021-11-21 01:27:33,532 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:27:33,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:27:33,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-11-21 01:27:33,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2021-11-21 01:27:33,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 1.0051546391752577) internal successors, (195), 194 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:33,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2021-11-21 01:27:33,554 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 98 [2021-11-21 01:27:33,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:27:33,554 INFO L470 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2021-11-21 01:27:33,555 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:27:33,555 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2021-11-21 01:27:33,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-11-21 01:27:33,559 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:27:33,559 INFO L514 BasicCegarLoop]: trace histogram [190, 1, 1, 1, 1] [2021-11-21 01:27:33,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:27:33,774 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:33,775 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:27:33,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:27:33,775 INFO L85 PathProgramCache]: Analyzing trace with hash 1544332582, now seen corresponding path program 7 times [2021-11-21 01:27:33,775 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:27:33,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41172031] [2021-11-21 01:27:33,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:27:33,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:27:34,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:46,321 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:46,321 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:27:46,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41172031] [2021-11-21 01:27:46,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41172031] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:27:46,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1011585308] [2021-11-21 01:27:46,321 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:27:46,322 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:27:46,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:27:46,322 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:27:46,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:27:46,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:27:46,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 1190 conjuncts, 192 conjunts are in the unsatisfiable core [2021-11-21 01:27:46,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:27:47,258 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:27:47,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:28:25,434 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:25,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1011585308] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:28:25,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1652664913] [2021-11-21 01:28:25,436 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 01:28:25,436 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:28:25,437 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:28:25,437 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:28:25,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:28:25,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:25,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:25,457 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:28:25,466 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-21 01:28:25,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:28:25,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:25,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:25,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:25,523 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:28:25,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 01:28:25,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:25,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:25,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-21 01:28:25,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:25,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:25,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 48 [2021-11-21 01:28:25,751 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-21 01:28:25,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 261 treesize of output 248 [2021-11-21 01:28:26,372 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:28:26,381 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:28:26,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 01:28:26,588 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:28:27,072 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:28:27,072 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:28:27,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [192, 192, 192] total 384 [2021-11-21 01:28:27,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582592359] [2021-11-21 01:28:27,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:28:27,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 385 states [2021-11-21 01:28:27,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:27,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 385 interpolants. [2021-11-21 01:28:27,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73929, Invalid=76227, Unknown=0, NotChecked=0, Total=150156 [2021-11-21 01:28:27,112 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand has 385 states, 385 states have (on average 1.0077922077922077) internal successors, (388), 384 states have internal predecessors, (388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:29,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:29,320 INFO L93 Difference]: Finished difference Result 390 states and 581 transitions. [2021-11-21 01:28:29,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2021-11-21 01:28:29,321 INFO L78 Accepts]: Start accepts. Automaton has has 385 states, 385 states have (on average 1.0077922077922077) internal successors, (388), 384 states have internal predecessors, (388), 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 194 [2021-11-21 01:28:29,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:29,325 INFO L225 Difference]: With dead ends: 390 [2021-11-21 01:28:29,326 INFO L226 Difference]: Without dead ends: 387 [2021-11-21 01:28:29,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 772 GetRequests, 386 SyntacticMatches, 0 SemanticMatches, 386 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2479 ImplicationChecksByTransitivity, 49.5s TimeCoverageRelationStatistics Valid=73929, Invalid=76227, Unknown=0, NotChecked=0, Total=150156 [2021-11-21 01:28:29,334 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 200 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 593 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 200 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:29,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 593 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [200 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:28:29,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2021-11-21 01:28:29,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 387. [2021-11-21 01:28:29,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 386 states have (on average 1.0025906735751295) internal successors, (387), 386 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:29,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 387 transitions. [2021-11-21 01:28:29,375 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 387 transitions. Word has length 194 [2021-11-21 01:28:29,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:29,376 INFO L470 AbstractCegarLoop]: Abstraction has 387 states and 387 transitions. [2021-11-21 01:28:29,378 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 385 states, 385 states have (on average 1.0077922077922077) internal successors, (388), 384 states have internal predecessors, (388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:29,378 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 387 transitions. [2021-11-21 01:28:29,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2021-11-21 01:28:29,390 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:29,390 INFO L514 BasicCegarLoop]: trace histogram [382, 1, 1, 1, 1] [2021-11-21 01:28:29,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:28:29,610 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:29,610 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:29,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:29,611 INFO L85 PathProgramCache]: Analyzing trace with hash -1191628506, now seen corresponding path program 8 times [2021-11-21 01:28:29,611 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:29,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864857412] [2021-11-21 01:28:29,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:29,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:30,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:19,302 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:29:19,302 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:29:19,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864857412] [2021-11-21 01:29:19,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864857412] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:29:19,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963657917] [2021-11-21 01:29:19,303 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:29:19,303 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:19,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:29:19,323 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:29:19,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_504d2769-b03a-4d61-94c3-8924b19244ef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process