./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_allDiff2_ground.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_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/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_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_allDiff2_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/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_6fc7c22c-875c-45ad-991c-c4c82d97ba36/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 45c2395b28f523380bfcff26ce2efb02406d69c6cc122ac9297e3f35ef9c7306 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:49:45,762 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:49:45,768 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:49:45,837 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:49:45,840 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:49:45,846 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:49:45,849 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:49:45,855 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:49:45,858 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:49:45,868 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:49:45,869 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:49:45,872 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:49:45,872 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:49:45,876 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:49:45,880 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:49:45,888 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:49:45,889 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:49:45,893 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:49:45,898 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:49:45,904 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:49:45,910 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:49:45,912 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:49:45,916 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:49:45,918 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:49:45,926 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:49:45,926 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:49:45,927 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:49:45,930 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:49:45,930 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:49:45,932 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:49:45,932 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:49:45,933 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:49:45,934 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:49:45,935 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:49:45,937 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:49:45,937 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:49:45,938 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:49:45,938 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:49:45,939 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:49:45,940 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:49:45,941 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:49:45,942 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:49:45,978 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:49:45,978 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:49:45,979 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:49:45,979 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:49:45,980 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:49:45,980 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:49:45,981 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:49:45,981 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:49:45,981 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:49:45,982 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:49:45,982 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:49:45,982 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:49:45,983 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:49:45,983 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:49:45,983 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:49:45,984 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:49:45,984 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:49:45,984 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:49:45,985 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:49:45,986 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:49:45,986 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:49:45,986 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:49:45,987 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:49:45,987 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:49:45,987 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:49:45,988 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:49:45,988 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:49:45,988 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:49:45,989 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:49:45,989 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:49:45,989 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:49:45,989 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:49:45,990 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:49:45,990 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:49:45,990 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:49:45,991 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:49:45,991 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:49:45,991 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:49:45,992 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:49:45,992 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:49:45,992 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:49:45,993 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_6fc7c22c-875c-45ad-991c-c4c82d97ba36/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 45c2395b28f523380bfcff26ce2efb02406d69c6cc122ac9297e3f35ef9c7306 [2021-11-20 23:49:46,321 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:49:46,348 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:49:46,351 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:49:46,353 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:49:46,354 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:49:46,355 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-examples/standard_allDiff2_ground.i [2021-11-20 23:49:46,444 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/data/0b04105da/48d1cfa2e2954dcfbe94476f96aa373a/FLAGce01360c7 [2021-11-20 23:49:47,003 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:49:47,004 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/sv-benchmarks/c/array-examples/standard_allDiff2_ground.i [2021-11-20 23:49:47,015 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/data/0b04105da/48d1cfa2e2954dcfbe94476f96aa373a/FLAGce01360c7 [2021-11-20 23:49:47,341 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/data/0b04105da/48d1cfa2e2954dcfbe94476f96aa373a [2021-11-20 23:49:47,343 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:49:47,345 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:49:47,354 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:49:47,354 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:49:47,358 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:49:47,359 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:49:47" (1/1) ... [2021-11-20 23:49:47,363 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f480c60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:47, skipping insertion in model container [2021-11-20 23:49:47,364 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:49:47" (1/1) ... [2021-11-20 23:49:47,378 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:49:47,397 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:49:47,616 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_6fc7c22c-875c-45ad-991c-c4c82d97ba36/sv-benchmarks/c/array-examples/standard_allDiff2_ground.i[817,830] [2021-11-20 23:49:47,643 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:49:47,652 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:49:47,665 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_6fc7c22c-875c-45ad-991c-c4c82d97ba36/sv-benchmarks/c/array-examples/standard_allDiff2_ground.i[817,830] [2021-11-20 23:49:47,675 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:49:47,691 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:49:47,691 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:47 WrapperNode [2021-11-20 23:49:47,691 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:49:47,693 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:49:47,693 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:49:47,693 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:49:47,700 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:47" (1/1) ... [2021-11-20 23:49:47,709 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:47" (1/1) ... [2021-11-20 23:49:47,740 INFO L137 Inliner]: procedures = 16, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 83 [2021-11-20 23:49:47,741 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:49:47,742 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:49:47,743 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:49:47,743 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:49:47,751 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:47" (1/1) ... [2021-11-20 23:49:47,752 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:47" (1/1) ... [2021-11-20 23:49:47,769 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:47" (1/1) ... [2021-11-20 23:49:47,774 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:47" (1/1) ... [2021-11-20 23:49:47,781 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:47" (1/1) ... [2021-11-20 23:49:47,791 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:47" (1/1) ... [2021-11-20 23:49:47,793 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:47" (1/1) ... [2021-11-20 23:49:47,796 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:49:47,797 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:49:47,798 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:49:47,798 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:49:47,799 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:47" (1/1) ... [2021-11-20 23:49:47,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:49:47,838 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:47,854 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:49:47,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:49:47,898 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:49:47,900 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:49:47,900 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:49:47,900 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:49:47,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:49:47,901 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:49:47,901 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:49:47,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:49:47,980 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:49:47,981 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:49:48,161 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:49:48,215 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:49:48,215 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-20 23:49:48,220 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:49:48 BoogieIcfgContainer [2021-11-20 23:49:48,220 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:49:48,224 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:49:48,225 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:49:48,255 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:49:48,255 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:49:47" (1/3) ... [2021-11-20 23:49:48,256 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7bdb8608 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:49:48, skipping insertion in model container [2021-11-20 23:49:48,256 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:47" (2/3) ... [2021-11-20 23:49:48,257 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7bdb8608 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:49:48, skipping insertion in model container [2021-11-20 23:49:48,257 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:49:48" (3/3) ... [2021-11-20 23:49:48,258 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_allDiff2_ground.i [2021-11-20 23:49:48,265 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:49:48,265 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:49:48,379 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:49:48,388 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 [2021-11-20 23:49:48,388 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:49:48,406 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 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) [2021-11-20 23:49:48,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-20 23:49:48,424 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:48,425 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:48,426 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:48,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:48,432 INFO L85 PathProgramCache]: Analyzing trace with hash -1443804038, now seen corresponding path program 1 times [2021-11-20 23:49:48,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:48,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438117086] [2021-11-20 23:49:48,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:48,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:48,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:48,708 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:49:48,709 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:48,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438117086] [2021-11-20 23:49:48,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438117086] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:48,711 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:49:48,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:49:48,713 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792040390] [2021-11-20 23:49:48,714 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:48,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:48,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:48,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:48,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:49:48,777 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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) [2021-11-20 23:49:48,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:48,872 INFO L93 Difference]: Finished difference Result 25 states and 37 transitions. [2021-11-20 23:49:48,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:48,876 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-20 23:49:48,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:48,886 INFO L225 Difference]: With dead ends: 25 [2021-11-20 23:49:48,886 INFO L226 Difference]: Without dead ends: 12 [2021-11-20 23:49:48,890 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 [2021-11-20 23:49:48,902 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:48,904 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:49:48,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-20 23:49:48,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-20 23:49:48,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:48,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 16 transitions. [2021-11-20 23:49:48,949 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 16 transitions. Word has length 8 [2021-11-20 23:49:48,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:48,950 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 16 transitions. [2021-11-20 23:49:48,950 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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) [2021-11-20 23:49:48,951 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 16 transitions. [2021-11-20 23:49:48,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 23:49:48,953 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:48,953 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:48,953 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:49:48,955 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:48,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:48,962 INFO L85 PathProgramCache]: Analyzing trace with hash 322298903, now seen corresponding path program 1 times [2021-11-20 23:49:48,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:48,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175346047] [2021-11-20 23:49:48,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:48,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:48,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:49,056 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:49:49,056 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:49,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1175346047] [2021-11-20 23:49:49,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1175346047] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:49,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1799370449] [2021-11-20 23:49:49,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:49,059 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:49,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:49,067 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:49,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:49:49,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:49,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:49:49,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:49,258 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:49:49,258 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:49:49,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1799370449] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:49,259 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:49:49,259 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3] total 5 [2021-11-20 23:49:49,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697053310] [2021-11-20 23:49:49,261 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:49,262 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:49:49,262 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:49,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:49:49,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:49:49,264 INFO L87 Difference]: Start difference. First operand 12 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 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) [2021-11-20 23:49:49,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:49,315 INFO L93 Difference]: Finished difference Result 21 states and 28 transitions. [2021-11-20 23:49:49,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:49:49,317 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-20 23:49:49,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:49,320 INFO L225 Difference]: With dead ends: 21 [2021-11-20 23:49:49,320 INFO L226 Difference]: Without dead ends: 14 [2021-11-20 23:49:49,321 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:49:49,328 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 3 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:49,329 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 17 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:49:49,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-20 23:49:49,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2021-11-20 23:49:49,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 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) [2021-11-20 23:49:49,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 17 transitions. [2021-11-20 23:49:49,340 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 17 transitions. Word has length 9 [2021-11-20 23:49:49,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:49,340 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 17 transitions. [2021-11-20 23:49:49,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 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) [2021-11-20 23:49:49,341 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 17 transitions. [2021-11-20 23:49:49,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-20 23:49:49,342 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:49,342 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:49,392 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:49,555 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:49,556 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:49,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:49,556 INFO L85 PathProgramCache]: Analyzing trace with hash 537647847, now seen corresponding path program 1 times [2021-11-20 23:49:49,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:49,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783870757] [2021-11-20 23:49:49,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:49,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:49,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:49,650 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:49:49,650 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:49,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783870757] [2021-11-20 23:49:49,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [783870757] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:49,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [486415966] [2021-11-20 23:49:49,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:49,651 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:49,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:49,655 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:49,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:49:49,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:49,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:49:49,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:49,809 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:49:49,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:49:49,874 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:49:49,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [486415966] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:49:49,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1906415024] [2021-11-20 23:49:49,917 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:49:49,918 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:49:49,938 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:49:49,945 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:49:49,945 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:49:50,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:50,105 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:49:50,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:49:50,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:50,167 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:49:50,168 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:49:50,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:50,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:49:50,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:50,541 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:49:50,576 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:49:50,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2021-11-20 23:49:51,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:49:51,317 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:49:51,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1906415024] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:51,425 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:49:51,425 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 9 [2021-11-20 23:49:51,428 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390291270] [2021-11-20 23:49:51,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:51,429 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:49:51,429 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:51,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:49:51,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-20 23:49:51,431 INFO L87 Difference]: Start difference. First operand 13 states and 17 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:51,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:51,502 INFO L93 Difference]: Finished difference Result 24 states and 33 transitions. [2021-11-20 23:49:51,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:49:51,503 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-20 23:49:51,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:51,504 INFO L225 Difference]: With dead ends: 24 [2021-11-20 23:49:51,504 INFO L226 Difference]: Without dead ends: 15 [2021-11-20 23:49:51,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-20 23:49:51,517 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 11 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:51,519 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 12 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:49:51,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-20 23:49:51,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2021-11-20 23:49:51,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 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) [2021-11-20 23:49:51,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 18 transitions. [2021-11-20 23:49:51,525 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 18 transitions. Word has length 11 [2021-11-20 23:49:51,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:51,526 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 18 transitions. [2021-11-20 23:49:51,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:51,526 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 18 transitions. [2021-11-20 23:49:51,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 23:49:51,527 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:51,527 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:51,573 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:51,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:51,756 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:51,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:51,756 INFO L85 PathProgramCache]: Analyzing trace with hash 1838473358, now seen corresponding path program 1 times [2021-11-20 23:49:51,757 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:51,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175571253] [2021-11-20 23:49:51,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:51,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:51,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:51,798 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:49:51,798 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:51,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [175571253] [2021-11-20 23:49:51,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [175571253] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:51,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813371494] [2021-11-20 23:49:51,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:51,799 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:51,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:51,801 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:51,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:49:51,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:51,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:49:51,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:51,899 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:49:51,899 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:49:51,956 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:49:51,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1813371494] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:49:51,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [804745622] [2021-11-20 23:49:51,960 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:49:51,960 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:49:51,961 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:49:51,961 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:49:51,961 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:49:51,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:52,012 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:49:52,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:49:52,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:52,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-20 23:49:52,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:52,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:49:52,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:52,323 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:49:52,352 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:49:52,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2021-11-20 23:49:52,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:49:53,869 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:49:54,400 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:49:54,401 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:49:54,401 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-20 23:49:54,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934374218] [2021-11-20 23:49:54,401 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:49:54,402 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:49:54,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:54,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:49:54,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=146, Unknown=0, NotChecked=0, Total=210 [2021-11-20 23:49:54,403 INFO L87 Difference]: Start difference. First operand 14 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-11-20 23:49:54,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:54,475 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2021-11-20 23:49:54,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:49:54,476 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 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 12 [2021-11-20 23:49:54,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:54,477 INFO L225 Difference]: With dead ends: 46 [2021-11-20 23:49:54,477 INFO L226 Difference]: Without dead ends: 35 [2021-11-20 23:49:54,478 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=64, Invalid=146, Unknown=0, NotChecked=0, Total=210 [2021-11-20 23:49:54,481 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 37 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:54,483 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 24 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:49:54,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-20 23:49:54,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 17. [2021-11-20 23:49:54,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:54,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-11-20 23:49:54,497 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 12 [2021-11-20 23:49:54,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:54,498 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-11-20 23:49:54,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-11-20 23:49:54,499 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-11-20 23:49:54,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-20 23:49:54,500 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:54,500 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:54,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:54,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:54,720 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:54,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:54,720 INFO L85 PathProgramCache]: Analyzing trace with hash 179221003, now seen corresponding path program 2 times [2021-11-20 23:49:54,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:54,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548841237] [2021-11-20 23:49:54,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:54,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:54,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:54,789 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:49:54,789 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:54,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548841237] [2021-11-20 23:49:54,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [548841237] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:54,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308130215] [2021-11-20 23:49:54,790 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:49:54,790 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:54,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:54,796 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:54,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:49:54,868 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:49:54,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:49:54,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:49:54,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:54,908 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:49:54,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:49:54,952 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:49:54,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1308130215] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:49:54,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1583870379] [2021-11-20 23:49:54,956 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:49:54,956 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:49:54,956 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:49:54,957 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:49:54,957 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:49:54,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:54,990 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:49:54,991 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:49:55,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:55,033 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:49:55,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:49:55,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:55,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:49:55,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:55,219 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:49:55,245 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:49:55,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2021-11-20 23:49:55,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:49:56,695 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:49:57,236 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:49:57,236 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:49:57,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-20 23:49:57,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865394582] [2021-11-20 23:49:57,237 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:49:57,237 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 23:49:57,237 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:57,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 23:49:57,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2021-11-20 23:49:57,238 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:57,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:57,330 INFO L93 Difference]: Finished difference Result 32 states and 43 transitions. [2021-11-20 23:49:57,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-20 23:49:57,331 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-20 23:49:57,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:57,332 INFO L225 Difference]: With dead ends: 32 [2021-11-20 23:49:57,332 INFO L226 Difference]: Without dead ends: 23 [2021-11-20 23:49:57,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=258, Unknown=0, NotChecked=0, Total=342 [2021-11-20 23:49:57,334 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 12 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:57,334 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 29 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:49:57,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-20 23:49:57,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-20 23:49:57,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 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) [2021-11-20 23:49:57,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 30 transitions. [2021-11-20 23:49:57,342 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 30 transitions. Word has length 15 [2021-11-20 23:49:57,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:57,342 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 30 transitions. [2021-11-20 23:49:57,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:49:57,342 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 30 transitions. [2021-11-20 23:49:57,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-20 23:49:57,344 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:57,344 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:57,390 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:57,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:57,571 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:57,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:57,572 INFO L85 PathProgramCache]: Analyzing trace with hash -973540485, now seen corresponding path program 3 times [2021-11-20 23:49:57,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:57,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924190529] [2021-11-20 23:49:57,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:57,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:57,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:57,692 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-20 23:49:57,692 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:57,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924190529] [2021-11-20 23:49:57,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1924190529] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:57,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1959631724] [2021-11-20 23:49:57,693 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:49:57,694 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:57,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:57,696 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:57,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:49:57,766 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:49:57,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:49:57,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-20 23:49:57,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:57,843 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:49:57,843 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:49:57,948 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:49:57,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1959631724] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:49:57,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1819807996] [2021-11-20 23:49:57,952 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:49:57,953 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:49:57,953 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:49:57,954 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:49:57,954 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:49:57,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:57,993 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:49:57,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:49:58,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:58,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:58,047 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:49:58,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:49:58,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:58,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:49:58,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:58,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:58,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:58,290 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:49:58,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 202 treesize of output 190 [2021-11-20 23:49:58,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:49:59,592 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:50:00,058 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:50:00,058 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:50:00,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8] total 14 [2021-11-20 23:50:00,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225928225] [2021-11-20 23:50:00,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:50:00,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 23:50:00,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:00,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 23:50:00,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=339, Unknown=0, NotChecked=0, Total=462 [2021-11-20 23:50:00,061 INFO L87 Difference]: Start difference. First operand 23 states and 30 transitions. Second operand has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 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) [2021-11-20 23:50:00,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:00,283 INFO L93 Difference]: Finished difference Result 65 states and 97 transitions. [2021-11-20 23:50:00,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-20 23:50:00,284 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 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 21 [2021-11-20 23:50:00,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:00,285 INFO L225 Difference]: With dead ends: 65 [2021-11-20 23:50:00,285 INFO L226 Difference]: Without dead ends: 42 [2021-11-20 23:50:00,286 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=177, Invalid=579, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:50:00,287 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 47 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:00,287 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 23 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:50:00,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-20 23:50:00,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-11-20 23:50:00,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.3414634146341464) internal successors, (55), 41 states have internal predecessors, (55), 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) [2021-11-20 23:50:00,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 55 transitions. [2021-11-20 23:50:00,301 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 55 transitions. Word has length 21 [2021-11-20 23:50:00,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:00,301 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 55 transitions. [2021-11-20 23:50:00,301 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 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) [2021-11-20 23:50:00,302 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 55 transitions. [2021-11-20 23:50:00,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 23:50:00,303 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:00,303 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:00,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:00,530 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:00,531 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:00,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:00,531 INFO L85 PathProgramCache]: Analyzing trace with hash -720959426, now seen corresponding path program 4 times [2021-11-20 23:50:00,531 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:00,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821127448] [2021-11-20 23:50:00,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:00,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:00,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:00,718 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-20 23:50:00,718 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:00,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821127448] [2021-11-20 23:50:00,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821127448] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:00,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [616652721] [2021-11-20 23:50:00,719 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:50:00,719 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:00,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:00,724 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:00,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:50:00,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:00,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-20 23:50:00,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:00,943 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-20 23:50:00,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:50:01,256 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-20 23:50:01,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [616652721] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:50:01,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1885232568] [2021-11-20 23:50:01,259 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:50:01,259 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:50:01,260 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:50:01,260 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:50:01,260 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:50:01,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:01,312 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:50:01,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:50:01,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:01,354 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 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-20 23:50:01,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:01,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:50:01,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:01,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:01,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:01,517 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:50:01,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 202 treesize of output 190 [2021-11-20 23:50:01,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:50:02,841 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:50:03,366 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:50:03,366 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:50:03,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2021-11-20 23:50:03,367 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162158201] [2021-11-20 23:50:03,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:50:03,368 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-20 23:50:03,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:03,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-20 23:50:03,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=796, Unknown=0, NotChecked=0, Total=1190 [2021-11-20 23:50:03,370 INFO L87 Difference]: Start difference. First operand 42 states and 55 transitions. Second operand has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 26 states have internal predecessors, (37), 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) [2021-11-20 23:50:03,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:03,717 INFO L93 Difference]: Finished difference Result 201 states and 278 transitions. [2021-11-20 23:50:03,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-20 23:50:03,718 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-20 23:50:03,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:03,720 INFO L225 Difference]: With dead ends: 201 [2021-11-20 23:50:03,721 INFO L226 Difference]: Without dead ends: 172 [2021-11-20 23:50:03,722 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=394, Invalid=796, Unknown=0, NotChecked=0, Total=1190 [2021-11-20 23:50:03,723 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 482 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 482 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:03,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [482 Valid, 96 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:50:03,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-11-20 23:50:03,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 55. [2021-11-20 23:50:03,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2592592592592593) internal successors, (68), 54 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:03,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 68 transitions. [2021-11-20 23:50:03,742 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 68 transitions. Word has length 40 [2021-11-20 23:50:03,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:03,742 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 68 transitions. [2021-11-20 23:50:03,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 26 states have internal predecessors, (37), 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) [2021-11-20 23:50:03,743 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 68 transitions. [2021-11-20 23:50:03,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-20 23:50:03,745 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:03,745 INFO L514 BasicCegarLoop]: trace histogram [24, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:03,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:03,960 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:03,961 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:03,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:03,961 INFO L85 PathProgramCache]: Analyzing trace with hash -818477541, now seen corresponding path program 5 times [2021-11-20 23:50:03,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:03,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519824527] [2021-11-20 23:50:03,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:03,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:04,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:04,534 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-20 23:50:04,535 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:04,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519824527] [2021-11-20 23:50:04,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519824527] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:04,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2108251624] [2021-11-20 23:50:04,535 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:50:04,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:04,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:04,537 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:04,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:50:04,589 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:50:04,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:50:04,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-20 23:50:04,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:04,772 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 390 trivial. 0 not checked. [2021-11-20 23:50:04,772 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:50:04,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2108251624] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:04,772 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:50:04,772 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [26] total 30 [2021-11-20 23:50:04,773 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334299674] [2021-11-20 23:50:04,773 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:04,773 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:50:04,773 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:04,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:50:04,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=510, Unknown=0, NotChecked=0, Total=870 [2021-11-20 23:50:04,774 INFO L87 Difference]: Start difference. First operand 55 states and 68 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:04,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:04,869 INFO L93 Difference]: Finished difference Result 96 states and 136 transitions. [2021-11-20 23:50:04,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:50:04,870 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-20 23:50:04,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:04,871 INFO L225 Difference]: With dead ends: 96 [2021-11-20 23:50:04,871 INFO L226 Difference]: Without dead ends: 89 [2021-11-20 23:50:04,872 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2021-11-20 23:50:04,873 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 2 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:04,874 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 17 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:50:04,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-20 23:50:04,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 56. [2021-11-20 23:50:04,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.2727272727272727) internal successors, (70), 55 states have internal predecessors, (70), 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) [2021-11-20 23:50:04,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2021-11-20 23:50:04,892 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 53 [2021-11-20 23:50:04,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:04,892 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2021-11-20 23:50:04,892 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:50:04,893 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2021-11-20 23:50:04,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-20 23:50:04,895 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:04,895 INFO L514 BasicCegarLoop]: trace histogram [24, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:04,941 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:05,115 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:05,115 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:05,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:05,116 INFO L85 PathProgramCache]: Analyzing trace with hash -1546708006, now seen corresponding path program 6 times [2021-11-20 23:50:05,116 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:05,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409180737] [2021-11-20 23:50:05,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:05,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:05,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:05,553 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-20 23:50:05,553 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:05,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409180737] [2021-11-20 23:50:05,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409180737] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:05,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580466672] [2021-11-20 23:50:05,554 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:50:05,554 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:05,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:05,562 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:05,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:50:05,656 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:50:05,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:50:05,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-20 23:50:05,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:05,818 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2021-11-20 23:50:05,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:50:06,255 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2021-11-20 23:50:06,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580466672] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:50:06,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1239068822] [2021-11-20 23:50:06,258 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:50:06,258 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:50:06,259 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:50:06,259 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:50:06,259 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:50:06,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:06,306 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:50:06,307 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:50:06,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:06,344 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:50:06,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:50:06,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:06,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:50:06,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:06,552 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:50:06,576 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:50:06,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2021-11-20 23:50:06,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:50:07,965 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:50:08,559 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:50:08,560 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:50:08,560 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 14, 14] total 39 [2021-11-20 23:50:08,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336372150] [2021-11-20 23:50:08,560 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:50:08,561 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-20 23:50:08,561 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:08,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-20 23:50:08,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=748, Invalid=1414, Unknown=0, NotChecked=0, Total=2162 [2021-11-20 23:50:08,564 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 39 states have internal predecessors, (86), 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) [2021-11-20 23:50:09,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:09,699 INFO L93 Difference]: Finished difference Result 224 states and 338 transitions. [2021-11-20 23:50:09,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-20 23:50:09,702 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 39 states have internal predecessors, (86), 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 54 [2021-11-20 23:50:09,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:09,707 INFO L225 Difference]: With dead ends: 224 [2021-11-20 23:50:09,708 INFO L226 Difference]: Without dead ends: 169 [2021-11-20 23:50:09,712 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 879 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1448, Invalid=3664, Unknown=0, NotChecked=0, Total=5112 [2021-11-20 23:50:09,715 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 281 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:09,716 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 23 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:50:09,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-20 23:50:09,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 118. [2021-11-20 23:50:09,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.3418803418803418) internal successors, (157), 117 states have internal predecessors, (157), 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) [2021-11-20 23:50:09,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 157 transitions. [2021-11-20 23:50:09,788 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 157 transitions. Word has length 54 [2021-11-20 23:50:09,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:09,789 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 157 transitions. [2021-11-20 23:50:09,789 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 39 states have internal predecessors, (86), 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) [2021-11-20 23:50:09,789 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 157 transitions. [2021-11-20 23:50:09,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-20 23:50:09,802 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:09,803 INFO L514 BasicCegarLoop]: trace histogram [36, 35, 35, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:09,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:10,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:10,019 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:10,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:10,020 INFO L85 PathProgramCache]: Analyzing trace with hash -267468214, now seen corresponding path program 7 times [2021-11-20 23:50:10,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:10,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870621944] [2021-11-20 23:50:10,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:10,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:10,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:10,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2021-11-20 23:50:10,932 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:10,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870621944] [2021-11-20 23:50:10,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870621944] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:10,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191226420] [2021-11-20 23:50:10,932 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:50:10,932 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:10,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:10,933 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:10,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:50:11,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:11,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 23:50:11,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:11,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2021-11-20 23:50:11,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:50:13,621 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2021-11-20 23:50:13,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1191226420] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:50:13,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1548152047] [2021-11-20 23:50:13,624 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:50:13,625 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:50:13,625 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:50:13,625 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:50:13,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:50:13,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,685 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:50:13,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:50:13,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-20 23:50:13,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:50:13,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,894 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:50:13,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 202 treesize of output 190 [2021-11-20 23:50:14,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:50:15,049 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:50:15,792 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:50:15,792 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:50:15,792 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 76 [2021-11-20 23:50:15,793 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778833673] [2021-11-20 23:50:15,793 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:50:15,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-20 23:50:15,794 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:15,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-20 23:50:15,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2969, Invalid=4171, Unknown=0, NotChecked=0, Total=7140 [2021-11-20 23:50:15,798 INFO L87 Difference]: Start difference. First operand 118 states and 157 transitions. Second operand has 77 states, 77 states have (on average 1.12987012987013) internal successors, (87), 76 states have internal predecessors, (87), 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) [2021-11-20 23:50:17,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:17,074 INFO L93 Difference]: Finished difference Result 655 states and 922 transitions. [2021-11-20 23:50:17,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-20 23:50:17,075 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 1.12987012987013) internal successors, (87), 76 states have internal predecessors, (87), 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 116 [2021-11-20 23:50:17,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:17,080 INFO L225 Difference]: With dead ends: 655 [2021-11-20 23:50:17,080 INFO L226 Difference]: Without dead ends: 575 [2021-11-20 23:50:17,084 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 301 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1032 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2969, Invalid=4171, Unknown=0, NotChecked=0, Total=7140 [2021-11-20 23:50:17,085 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 1608 mSDsluCounter, 328 mSDsCounter, 0 mSdLazyCounter, 427 mSolverCounterSat, 308 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1608 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 735 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 308 IncrementalHoareTripleChecker+Valid, 427 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:17,085 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1608 Valid, 252 Invalid, 735 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [308 Valid, 427 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:50:17,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-20 23:50:17,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 156. [2021-11-20 23:50:17,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 155 states have (on average 1.2580645161290323) internal successors, (195), 155 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) [2021-11-20 23:50:17,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 195 transitions. [2021-11-20 23:50:17,132 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 195 transitions. Word has length 116 [2021-11-20 23:50:17,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:17,133 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 195 transitions. [2021-11-20 23:50:17,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 1.12987012987013) internal successors, (87), 76 states have internal predecessors, (87), 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) [2021-11-20 23:50:17,133 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 195 transitions. [2021-11-20 23:50:17,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-20 23:50:17,155 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:17,156 INFO L514 BasicCegarLoop]: trace histogram [74, 35, 35, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:17,197 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:17,356 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-20 23:50:17,357 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:17,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:17,357 INFO L85 PathProgramCache]: Analyzing trace with hash -2007331030, now seen corresponding path program 8 times [2021-11-20 23:50:17,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:17,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135719394] [2021-11-20 23:50:17,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:17,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:17,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:20,127 INFO L134 CoverageAnalysis]: Checked inductivity of 4071 backedges. 0 proven. 2775 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2021-11-20 23:50:20,128 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:20,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135719394] [2021-11-20 23:50:20,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135719394] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:20,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1095183998] [2021-11-20 23:50:20,128 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:50:20,128 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:20,128 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:20,129 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:20,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:50:20,205 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:50:20,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:50:20,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 23:50:20,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:20,693 INFO L134 CoverageAnalysis]: Checked inductivity of 4071 backedges. 105 proven. 1 refuted. 0 times theorem prover too weak. 3965 trivial. 0 not checked. [2021-11-20 23:50:20,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:50:21,168 INFO L134 CoverageAnalysis]: Checked inductivity of 4071 backedges. 105 proven. 1 refuted. 0 times theorem prover too weak. 3965 trivial. 0 not checked. [2021-11-20 23:50:21,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1095183998] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:50:21,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [691936288] [2021-11-20 23:50:21,171 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:50:21,171 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:50:21,171 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:50:21,172 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:50:21,172 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:50:21,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:21,205 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:50:21,205 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:50:21,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:21,236 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:50:21,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:50:21,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:21,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:50:21,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:21,380 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:50:21,411 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:50:21,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2021-11-20 23:50:21,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:50:22,566 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:50:23,441 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:50:23,442 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:50:23,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 6, 6] total 84 [2021-11-20 23:50:23,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322648346] [2021-11-20 23:50:23,443 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:50:23,443 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-20 23:50:23,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:23,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-20 23:50:23,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3220, Invalid=5152, Unknown=0, NotChecked=0, Total=8372 [2021-11-20 23:50:23,449 INFO L87 Difference]: Start difference. First operand 156 states and 195 transitions. Second operand has 84 states, 84 states have (on average 1.1904761904761905) internal successors, (100), 84 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) [2021-11-20 23:50:50,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:50,938 INFO L93 Difference]: Finished difference Result 4022 states and 6120 transitions. [2021-11-20 23:50:50,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 451 states. [2021-11-20 23:50:50,938 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.1904761904761905) internal successors, (100), 84 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 154 [2021-11-20 23:50:50,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:50,968 INFO L225 Difference]: With dead ends: 4022 [2021-11-20 23:50:50,969 INFO L226 Difference]: Without dead ends: 3867 [2021-11-20 23:50:51,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 908 GetRequests, 446 SyntacticMatches, 0 SemanticMatches, 462 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74985 ImplicationChecksByTransitivity, 23.8s TimeCoverageRelationStatistics Valid=45635, Invalid=169197, Unknown=0, NotChecked=0, Total=214832 [2021-11-20 23:50:51,003 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 1277 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 442 mSolverCounterSat, 2949 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1277 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 3391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2949 IncrementalHoareTripleChecker+Valid, 442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:51,003 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1277 Valid, 47 Invalid, 3391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2949 Valid, 442 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-20 23:50:51,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3867 states. [2021-11-20 23:50:51,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3867 to 387. [2021-11-20 23:50:51,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 386 states have (on average 1.5932642487046633) internal successors, (615), 386 states have internal predecessors, (615), 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) [2021-11-20 23:50:51,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 615 transitions. [2021-11-20 23:50:51,303 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 615 transitions. Word has length 154 [2021-11-20 23:50:51,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:51,303 INFO L470 AbstractCegarLoop]: Abstraction has 387 states and 615 transitions. [2021-11-20 23:50:51,303 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.1904761904761905) internal successors, (100), 84 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) [2021-11-20 23:50:51,303 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 615 transitions. [2021-11-20 23:50:51,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2021-11-20 23:50:51,310 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:51,311 INFO L514 BasicCegarLoop]: trace histogram [151, 76, 75, 75, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:51,350 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-11-20 23:50:51,539 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:51,539 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:51,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:51,540 INFO L85 PathProgramCache]: Analyzing trace with hash 1046550603, now seen corresponding path program 9 times [2021-11-20 23:50:51,540 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:51,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1189717770] [2021-11-20 23:50:51,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:51,540 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:51,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:54,700 INFO L134 CoverageAnalysis]: Checked inductivity of 31201 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 28275 trivial. 0 not checked. [2021-11-20 23:50:54,700 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:54,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1189717770] [2021-11-20 23:50:54,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1189717770] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:54,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298875617] [2021-11-20 23:50:54,701 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:50:54,701 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:54,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:54,712 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:54,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:50:55,218 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:50:55,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:50:55,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 1791 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-20 23:50:55,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:56,276 INFO L134 CoverageAnalysis]: Checked inductivity of 31201 backedges. 0 proven. 28045 refuted. 0 times theorem prover too weak. 3156 trivial. 0 not checked. [2021-11-20 23:50:56,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:51:04,141 INFO L134 CoverageAnalysis]: Checked inductivity of 31201 backedges. 0 proven. 28045 refuted. 0 times theorem prover too weak. 3156 trivial. 0 not checked. [2021-11-20 23:51:04,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298875617] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:51:04,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1085403571] [2021-11-20 23:51:04,145 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:51:04,145 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:51:04,145 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:51:04,146 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:51:04,146 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:51:04,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:04,192 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:51:04,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:51:04,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:04,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-20 23:51:04,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:04,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:51:04,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:04,380 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:51:04,418 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:51:04,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2021-11-20 23:51:04,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:51:05,766 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:51:06,594 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:51:06,594 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:51:06,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 79, 79] total 156 [2021-11-20 23:51:06,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556832171] [2021-11-20 23:51:06,595 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:51:06,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 156 states [2021-11-20 23:51:06,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:06,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2021-11-20 23:51:06,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11980, Invalid=14752, Unknown=0, NotChecked=0, Total=26732 [2021-11-20 23:51:06,606 INFO L87 Difference]: Start difference. First operand 387 states and 615 transitions. Second operand has 156 states, 156 states have (on average 3.4871794871794872) internal successors, (544), 156 states have internal predecessors, (544), 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) [2021-11-20 23:51:37,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:37,357 INFO L93 Difference]: Finished difference Result 34751 states and 60711 transitions. [2021-11-20 23:51:37,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 232 states. [2021-11-20 23:51:37,358 INFO L78 Accepts]: Start accepts. Automaton has has 156 states, 156 states have (on average 3.4871794871794872) internal successors, (544), 156 states have internal predecessors, (544), 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 385 [2021-11-20 23:51:37,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:37,561 INFO L225 Difference]: With dead ends: 34751 [2021-11-20 23:51:37,561 INFO L226 Difference]: Without dead ends: 34365 [2021-11-20 23:51:37,683 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1308 GetRequests, 1069 SyntacticMatches, 0 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8055 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=18140, Invalid=39700, Unknown=0, NotChecked=0, Total=57840 [2021-11-20 23:51:37,685 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 588 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 725 mSolverCounterSat, 593 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 588 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 1318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 593 IncrementalHoareTripleChecker+Valid, 725 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:37,686 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [588 Valid, 53 Invalid, 1318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [593 Valid, 725 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-20 23:51:37,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34365 states. [2021-11-20 23:51:40,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34365 to 618. [2021-11-20 23:51:40,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 618 states, 617 states have (on average 1.4959481361426257) internal successors, (923), 617 states have internal predecessors, (923), 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) [2021-11-20 23:51:40,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 618 states to 618 states and 923 transitions. [2021-11-20 23:51:40,147 INFO L78 Accepts]: Start accepts. Automaton has 618 states and 923 transitions. Word has length 385 [2021-11-20 23:51:40,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:40,148 INFO L470 AbstractCegarLoop]: Abstraction has 618 states and 923 transitions. [2021-11-20 23:51:40,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 156 states, 156 states have (on average 3.4871794871794872) internal successors, (544), 156 states have internal predecessors, (544), 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) [2021-11-20 23:51:40,149 INFO L276 IsEmpty]: Start isEmpty. Operand 618 states and 923 transitions. [2021-11-20 23:51:40,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 617 [2021-11-20 23:51:40,170 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:40,170 INFO L514 BasicCegarLoop]: trace histogram [153, 152, 152, 151, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:51:40,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 23:51:40,395 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 23:51:40,395 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:40,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:40,396 INFO L85 PathProgramCache]: Analyzing trace with hash 1410044638, now seen corresponding path program 10 times [2021-11-20 23:51:40,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:40,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [73189399] [2021-11-20 23:51:40,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:40,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:40,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:50,850 INFO L134 CoverageAnalysis]: Checked inductivity of 69162 backedges. 0 proven. 11781 refuted. 0 times theorem prover too weak. 57381 trivial. 0 not checked. [2021-11-20 23:51:50,850 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:50,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [73189399] [2021-11-20 23:51:50,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [73189399] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:51:50,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1058869243] [2021-11-20 23:51:50,851 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:51:50,851 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:51:50,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:51:50,876 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:51:50,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 23:51:51,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:51,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 2792 conjuncts, 155 conjunts are in the unsatisfiable core [2021-11-20 23:51:51,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:51:52,780 INFO L134 CoverageAnalysis]: Checked inductivity of 69162 backedges. 0 proven. 11781 refuted. 0 times theorem prover too weak. 57381 trivial. 0 not checked. [2021-11-20 23:51:52,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:52:21,493 INFO L134 CoverageAnalysis]: Checked inductivity of 69162 backedges. 0 proven. 11781 refuted. 0 times theorem prover too weak. 57381 trivial. 0 not checked. [2021-11-20 23:52:21,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1058869243] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:52:21,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1725268298] [2021-11-20 23:52:21,495 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:52:21,495 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:52:21,496 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:52:21,496 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:52:21,496 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:52:21,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:21,538 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:52:21,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:52:21,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:21,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:21,581 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:52:21,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:52:21,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:21,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:52:21,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:21,696 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:52:21,718 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:52:21,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2021-11-20 23:52:22,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:52:23,004 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:52:24,461 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:52:24,461 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:52:24,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [155, 155, 155] total 310 [2021-11-20 23:52:24,462 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984637644] [2021-11-20 23:52:24,462 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:52:24,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 311 states [2021-11-20 23:52:24,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:52:24,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 311 interpolants. [2021-11-20 23:52:24,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48248, Invalid=53194, Unknown=0, NotChecked=0, Total=101442 [2021-11-20 23:52:24,482 INFO L87 Difference]: Start difference. First operand 618 states and 923 transitions. Second operand has 311 states, 311 states have (on average 1.0321543408360128) internal successors, (321), 310 states have internal predecessors, (321), 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) [2021-11-20 23:55:28,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:55:28,909 INFO L93 Difference]: Finished difference Result 59544 states and 103441 transitions. [2021-11-20 23:55:28,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 310 states. [2021-11-20 23:55:28,925 INFO L78 Accepts]: Start accepts. Automaton has has 311 states, 311 states have (on average 1.0321543408360128) internal successors, (321), 310 states have internal predecessors, (321), 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 616 [2021-11-20 23:55:28,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:55:29,120 INFO L225 Difference]: With dead ends: 59544 [2021-11-20 23:55:29,121 INFO L226 Difference]: Without dead ends: 59081 [2021-11-20 23:55:29,151 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2001 GetRequests, 1684 SyntacticMatches, 0 SemanticMatches, 317 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4308 ImplicationChecksByTransitivity, 38.1s TimeCoverageRelationStatistics Valid=48248, Invalid=53194, Unknown=0, NotChecked=0, Total=101442 [2021-11-20 23:55:29,153 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 11178 mSDsluCounter, 1280 mSDsCounter, 0 mSdLazyCounter, 1724 mSolverCounterSat, 1968 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11178 SdHoareTripleChecker+Valid, 966 SdHoareTripleChecker+Invalid, 3692 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1968 IncrementalHoareTripleChecker+Valid, 1724 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:55:29,153 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11178 Valid, 966 Invalid, 3692 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1968 Valid, 1724 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-11-20 23:55:29,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59081 states. [2021-11-20 23:55:32,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59081 to 773. [2021-11-20 23:55:32,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 773 states, 772 states have (on average 1.3963730569948187) internal successors, (1078), 772 states have internal predecessors, (1078), 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) [2021-11-20 23:55:32,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 773 states to 773 states and 1078 transitions. [2021-11-20 23:55:32,513 INFO L78 Accepts]: Start accepts. Automaton has 773 states and 1078 transitions. Word has length 616 [2021-11-20 23:55:32,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:55:32,513 INFO L470 AbstractCegarLoop]: Abstraction has 773 states and 1078 transitions. [2021-11-20 23:55:32,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 311 states, 311 states have (on average 1.0321543408360128) internal successors, (321), 310 states have internal predecessors, (321), 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) [2021-11-20 23:55:32,514 INFO L276 IsEmpty]: Start isEmpty. Operand 773 states and 1078 transitions. [2021-11-20 23:55:32,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 772 [2021-11-20 23:55:32,523 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:55:32,523 INFO L514 BasicCegarLoop]: trace histogram [308, 152, 152, 151, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:55:32,565 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-20 23:55:32,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-20 23:55:32,751 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:55:32,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:55:32,752 INFO L85 PathProgramCache]: Analyzing trace with hash 847092571, now seen corresponding path program 11 times [2021-11-20 23:55:32,752 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:55:32,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237272173] [2021-11-20 23:55:32,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:55:32,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:55:34,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:56:10,990 INFO L134 CoverageAnalysis]: Checked inductivity of 104967 backedges. 0 proven. 47586 refuted. 0 times theorem prover too weak. 57381 trivial. 0 not checked. [2021-11-20 23:56:10,990 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:56:10,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237272173] [2021-11-20 23:56:10,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237272173] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:56:10,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [707355526] [2021-11-20 23:56:10,991 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:56:10,991 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:56:10,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:56:10,992 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:56:10,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc7c22c-875c-45ad-991c-c4c82d97ba36/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-20 23:56:11,201 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 23:56:11,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:56:11,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 23:56:11,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:56:13,344 INFO L134 CoverageAnalysis]: Checked inductivity of 104967 backedges. 1642 proven. 10 refuted. 0 times theorem prover too weak. 103315 trivial. 0 not checked. [2021-11-20 23:56:13,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:56:15,893 INFO L134 CoverageAnalysis]: Checked inductivity of 104967 backedges. 1642 proven. 10 refuted. 0 times theorem prover too weak. 103315 trivial. 0 not checked. [2021-11-20 23:56:15,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [707355526] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:56:15,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1137515537] [2021-11-20 23:56:15,897 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:56:15,897 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:56:15,897 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:56:15,898 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:56:15,898 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:56:15,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:56:15,930 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:56:15,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:56:15,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:56:15,971 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:56:15,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:56:16,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:56:16,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:56:16,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:56:16,130 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:56:16,151 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:56:16,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 192 treesize of output 191 [2021-11-20 23:56:16,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:56:17,358 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:56:19,464 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:56:19,464 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:56:19,465 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [310, 9, 9] total 324 [2021-11-20 23:56:19,465 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243669028] [2021-11-20 23:56:19,465 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:56:19,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 324 states [2021-11-20 23:56:19,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:56:19,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 324 interpolants. [2021-11-20 23:56:19,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50182, Invalid=59710, Unknown=0, NotChecked=0, Total=109892 [2021-11-20 23:56:19,495 INFO L87 Difference]: Start difference. First operand 773 states and 1078 transitions. Second operand has 324 states, 324 states have (on average 1.0493827160493827) internal successors, (340), 324 states have internal predecessors, (340), 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)