./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_sentinel.i.v+cfa-reducer.c --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_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/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_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_sentinel.i.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/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_04bdaba2-81f1-4b85-b226-f2e177df2300/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 6060f0df556deb332d160eff8a39bcf699b67887fb6a475da5cd3837f5257af8 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:43:26,773 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:43:26,776 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:43:26,823 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:43:26,823 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:43:26,825 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:43:26,828 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:43:26,831 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:43:26,834 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:43:26,836 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:43:26,837 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:43:26,839 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:43:26,840 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:43:26,841 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:43:26,843 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:43:26,845 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:43:26,853 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:43:26,855 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:43:26,862 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:43:26,865 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:43:26,877 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:43:26,879 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:43:26,881 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:43:26,890 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:43:26,895 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:43:26,896 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:43:26,896 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:43:26,897 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:43:26,898 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:43:26,899 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:43:26,899 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:43:26,900 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:43:26,902 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:43:26,903 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:43:26,905 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:43:26,905 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:43:26,906 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:43:26,907 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:43:26,907 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:43:26,909 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:43:26,910 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:43:26,911 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:43:26,951 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:43:26,952 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:43:26,952 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:43:26,952 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:43:26,953 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:43:26,953 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:43:26,954 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:43:26,954 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:43:26,954 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:43:26,955 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:43:26,955 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:43:26,955 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:43:26,956 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:43:26,956 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:43:26,956 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:43:26,957 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:43:26,957 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:43:26,957 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:43:26,958 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:43:26,959 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:43:26,959 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:43:26,959 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:43:26,959 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:43:26,960 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:43:26,960 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:43:26,961 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:43:26,961 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:43:26,961 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:43:26,962 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:43:26,962 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:43:26,962 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:43:26,963 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:43:26,971 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:43:26,971 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:43:26,971 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:43:26,972 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:43:26,973 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:43:26,974 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:43:26,974 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:43:26,974 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:43:26,975 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:43:26,975 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_04bdaba2-81f1-4b85-b226-f2e177df2300/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6060f0df556deb332d160eff8a39bcf699b67887fb6a475da5cd3837f5257af8 [2021-11-21 01:43:27,394 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:43:27,433 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:43:27,436 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:43:27,438 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:43:27,439 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:43:27,440 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-examples/standard_sentinel.i.v+cfa-reducer.c [2021-11-21 01:43:27,528 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/data/d051a9f7a/60f805737154412d9f02540a875ed9e2/FLAGb7879e986 [2021-11-21 01:43:28,048 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:43:28,048 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/sv-benchmarks/c/array-examples/standard_sentinel.i.v+cfa-reducer.c [2021-11-21 01:43:28,055 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/data/d051a9f7a/60f805737154412d9f02540a875ed9e2/FLAGb7879e986 [2021-11-21 01:43:28,400 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/data/d051a9f7a/60f805737154412d9f02540a875ed9e2 [2021-11-21 01:43:28,403 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:43:28,405 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:43:28,424 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:43:28,424 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:43:28,438 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:43:28,439 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:43:28" (1/1) ... [2021-11-21 01:43:28,440 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d136b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:43:28, skipping insertion in model container [2021-11-21 01:43:28,440 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:43:28" (1/1) ... [2021-11-21 01:43:28,450 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:43:28,470 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:43:28,673 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_04bdaba2-81f1-4b85-b226-f2e177df2300/sv-benchmarks/c/array-examples/standard_sentinel.i.v+cfa-reducer.c[991,1004] [2021-11-21 01:43:28,679 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:43:28,688 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:43:28,708 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_04bdaba2-81f1-4b85-b226-f2e177df2300/sv-benchmarks/c/array-examples/standard_sentinel.i.v+cfa-reducer.c[991,1004] [2021-11-21 01:43:28,711 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:43:28,726 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:43:28,727 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:43:28 WrapperNode [2021-11-21 01:43:28,727 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:43:28,728 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:43:28,728 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:43:28,729 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:43:28,738 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:43:28" (1/1) ... [2021-11-21 01:43:28,747 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:43:28" (1/1) ... [2021-11-21 01:43:28,770 INFO L137 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 68 [2021-11-21 01:43:28,771 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:43:28,772 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:43:28,772 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:43:28,772 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:43:28,782 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:43:28" (1/1) ... [2021-11-21 01:43:28,782 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:43:28" (1/1) ... [2021-11-21 01:43:28,785 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:43:28" (1/1) ... [2021-11-21 01:43:28,785 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:43:28" (1/1) ... [2021-11-21 01:43:28,792 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:43:28" (1/1) ... [2021-11-21 01:43:28,796 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:43:28" (1/1) ... [2021-11-21 01:43:28,798 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:43:28" (1/1) ... [2021-11-21 01:43:28,801 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:43:28,802 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:43:28,802 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:43:28,802 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:43:28,805 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:43:28" (1/1) ... [2021-11-21 01:43:28,815 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:43:28,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:43:28,845 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:43:28,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:43:28,888 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:43:28,888 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:43:28,888 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:43:28,888 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:43:28,889 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:43:28,889 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:43:28,889 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:43:28,889 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:43:28,978 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:43:28,980 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:43:29,204 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:43:29,227 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:43:29,227 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 01:43:29,230 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:43:29 BoogieIcfgContainer [2021-11-21 01:43:29,230 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:43:29,232 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:43:29,233 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:43:29,237 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:43:29,237 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:43:28" (1/3) ... [2021-11-21 01:43:29,238 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72412be1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:43:29, skipping insertion in model container [2021-11-21 01:43:29,238 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:43:28" (2/3) ... [2021-11-21 01:43:29,239 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72412be1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:43:29, skipping insertion in model container [2021-11-21 01:43:29,239 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:43:29" (3/3) ... [2021-11-21 01:43:29,241 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_sentinel.i.v+cfa-reducer.c [2021-11-21 01:43:29,248 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:43:29,248 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:43:29,306 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:43:29,315 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:43:29,315 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:43:29,333 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:29,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 01:43:29,339 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:43:29,340 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:43:29,341 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:43:29,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:43:29,348 INFO L85 PathProgramCache]: Analyzing trace with hash 272684364, now seen corresponding path program 1 times [2021-11-21 01:43:29,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:43:29,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552163614] [2021-11-21 01:43:29,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:43:29,362 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:43:29,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:43:29,608 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:43:29,609 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:43:29,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552163614] [2021-11-21 01:43:29,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1552163614] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:43:29,610 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:43:29,611 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:43:29,613 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186599373] [2021-11-21 01:43:29,614 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:43:29,619 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:43:29,619 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:43:29,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:43:29,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:43:29,655 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) 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) [2021-11-21 01:43:29,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:43:29,691 INFO L93 Difference]: Finished difference Result 21 states and 29 transitions. [2021-11-21 01:43:29,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:43:29,695 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 [2021-11-21 01:43:29,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:43:29,704 INFO L225 Difference]: With dead ends: 21 [2021-11-21 01:43:29,705 INFO L226 Difference]: Without dead ends: 10 [2021-11-21 01:43:29,708 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:43:29,714 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:43:29,721 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:43:29,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-21 01:43:29,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-11-21 01:43:29,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:29,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-11-21 01:43:29,803 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 8 [2021-11-21 01:43:29,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:43:29,803 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-11-21 01:43:29,804 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) [2021-11-21 01:43:29,804 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-11-21 01:43:29,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-21 01:43:29,805 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:43:29,805 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:43:29,806 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:43:29,806 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:43:29,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:43:29,808 INFO L85 PathProgramCache]: Analyzing trace with hash -2077770057, now seen corresponding path program 1 times [2021-11-21 01:43:29,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:43:29,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182189489] [2021-11-21 01:43:29,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:43:29,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:43:29,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:43:29,896 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:43:29,911 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:43:29,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182189489] [2021-11-21 01:43:29,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182189489] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:43:29,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [765660351] [2021-11-21 01:43:29,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:43:29,913 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:43:29,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:43:29,936 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:43:29,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:43:30,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:43:30,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:43:30,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:43:30,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:43:30,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:43:30,207 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:43:30,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [765660351] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:43:30,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [618716221] [2021-11-21 01:43:30,247 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:43:30,249 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:43:30,260 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:43:30,267 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:43:30,269 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:43:30,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:30,507 INFO L354 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2021-11-21 01:43:30,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 22 treesize of output 38 [2021-11-21 01:43:30,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:30,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:30,696 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:43:30,697 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:43:30,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:30,893 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 [2021-11-21 01:43:31,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:31,339 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:43:31,383 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:43:31,384 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 218 treesize of output 217 [2021-11-21 01:43:32,158 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 [2021-11-21 01:43:32,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:43:32,732 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:43:33,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [618716221] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:43:33,115 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:43:33,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 12 [2021-11-21 01:43:33,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080920594] [2021-11-21 01:43:33,117 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:43:33,118 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:43:33,119 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:43:33,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:43:33,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:43:33,120 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:33,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:43:33,173 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2021-11-21 01:43:33,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:43:33,173 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-21 01:43:33,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:43:33,174 INFO L225 Difference]: With dead ends: 15 [2021-11-21 01:43:33,174 INFO L226 Difference]: Without dead ends: 12 [2021-11-21 01:43:33,175 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:43:33,177 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 16 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:43:33,178 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 4 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:43:33,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-21 01:43:33,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-21 01:43:33,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:33,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-11-21 01:43:33,184 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 9 [2021-11-21 01:43:33,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:43:33,184 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-11-21 01:43:33,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:33,185 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-11-21 01:43:33,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 01:43:33,186 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:43:33,186 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:43:33,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:43:33,387 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:43:33,387 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:43:33,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:43:33,388 INFO L85 PathProgramCache]: Analyzing trace with hash 420679642, now seen corresponding path program 1 times [2021-11-21 01:43:33,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:43:33,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468970474] [2021-11-21 01:43:33,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:43:33,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:43:33,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:43:33,447 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:43:33,448 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:43:33,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468970474] [2021-11-21 01:43:33,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468970474] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:43:33,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494128281] [2021-11-21 01:43:33,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:43:33,451 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:43:33,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:43:33,452 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:43:33,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:43:33,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:43:33,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:43:33,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:43:33,556 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:43:33,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:43:33,609 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:43:33,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494128281] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:43:33,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [810146550] [2021-11-21 01:43:33,616 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:43:33,617 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:43:33,617 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:43:33,618 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:43:33,618 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:43:33,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:33,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:33,691 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:43:33,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:43:33,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:33,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2021-11-21 01:43:33,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:33,901 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 [2021-11-21 01:43:34,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:34,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:34,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:34,066 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:43:34,066 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 228 treesize of output 216 [2021-11-21 01:43:34,474 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 [2021-11-21 01:43:34,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:43:35,680 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:43:36,075 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:43:36,076 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:43:36,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-21 01:43:36,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165124321] [2021-11-21 01:43:36,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:43:36,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:43:36,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:43:36,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:43:36,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=128, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:43:36,079 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:36,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:43:36,116 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-11-21 01:43:36,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:43:36,117 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-21 01:43:36,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:43:36,118 INFO L225 Difference]: With dead ends: 24 [2021-11-21 01:43:36,118 INFO L226 Difference]: Without dead ends: 15 [2021-11-21 01:43:36,119 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=54, Invalid=128, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:43:36,121 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:43:36,121 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:43:36,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-21 01:43:36,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-21 01:43:36,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:36,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-11-21 01:43:36,128 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-11-21 01:43:36,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:43:36,129 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-11-21 01:43:36,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:36,129 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-11-21 01:43:36,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 01:43:36,130 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:43:36,130 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:43:36,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:43:36,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:43:36,352 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:43:36,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:43:36,352 INFO L85 PathProgramCache]: Analyzing trace with hash 55551983, now seen corresponding path program 2 times [2021-11-21 01:43:36,352 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:43:36,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811101437] [2021-11-21 01:43:36,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:43:36,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:43:36,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:43:36,477 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:43:36,477 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:43:36,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811101437] [2021-11-21 01:43:36,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [811101437] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:43:36,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [485191064] [2021-11-21 01:43:36,478 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:43:36,478 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:43:36,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:43:36,481 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:43:36,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:43:36,533 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:43:36,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:43:36,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:43:36,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:43:36,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:43:36,638 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:43:36,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 23 [2021-11-21 01:43:36,774 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:43:36,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:43:36,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2021-11-21 01:43:36,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 36 [2021-11-21 01:43:36,898 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:43:36,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [485191064] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:43:36,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1740142029] [2021-11-21 01:43:36,904 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:43:36,904 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:43:36,905 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:43:36,905 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:43:36,905 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:43:36,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:36,984 INFO L354 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2021-11-21 01:43:36,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 22 treesize of output 38 [2021-11-21 01:43:37,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:37,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:37,060 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:43:37,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:43:37,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:37,215 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 [2021-11-21 01:43:37,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:37,400 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:43:37,428 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:43:37,430 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 218 treesize of output 217 [2021-11-21 01:43:38,020 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 [2021-11-21 01:43:38,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:43:39,193 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:43:39,620 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:43:39,621 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:43:39,621 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 15 [2021-11-21 01:43:39,621 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763686251] [2021-11-21 01:43:39,621 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:43:39,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 01:43:39,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:43:39,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 01:43:39,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:43:39,623 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:39,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:43:39,829 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-11-21 01:43:39,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 01:43:39,830 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-21 01:43:39,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:43:39,830 INFO L225 Difference]: With dead ends: 31 [2021-11-21 01:43:39,830 INFO L226 Difference]: Without dead ends: 20 [2021-11-21 01:43:39,832 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=139, Invalid=617, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:43:39,833 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:43:39,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 16 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:43:39,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-21 01:43:39,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-21 01:43:39,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:39,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-21 01:43:39,842 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 14 [2021-11-21 01:43:39,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:43:39,842 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-21 01:43:39,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:39,843 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-21 01:43:39,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-21 01:43:39,843 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:43:39,844 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:43:39,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:43:40,044 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:43:40,045 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:43:40,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:43:40,045 INFO L85 PathProgramCache]: Analyzing trace with hash 960336160, now seen corresponding path program 3 times [2021-11-21 01:43:40,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:43:40,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055833859] [2021-11-21 01:43:40,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:43:40,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:43:40,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:43:40,143 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:43:40,143 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:43:40,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055833859] [2021-11-21 01:43:40,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055833859] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:43:40,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [708895373] [2021-11-21 01:43:40,145 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:43:40,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:43:40,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:43:40,159 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:43:40,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:43:40,210 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:43:40,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:43:40,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:43:40,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:43:40,263 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:43:40,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:43:40,373 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:43:40,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [708895373] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:43:40,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1625398762] [2021-11-21 01:43:40,378 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:43:40,378 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:43:40,378 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:43:40,379 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:43:40,379 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:43:40,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:40,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:40,444 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:43:40,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:43:40,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:40,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2021-11-21 01:43:40,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:40,625 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 [2021-11-21 01:43:40,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:40,749 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:43:40,775 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:43:40,776 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 218 treesize of output 217 [2021-11-21 01:43:41,290 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 [2021-11-21 01:43:41,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:43:42,347 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:43:42,780 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:43:42,780 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:43:42,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2021-11-21 01:43:42,780 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105980475] [2021-11-21 01:43:42,781 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:43:42,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 01:43:42,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:43:42,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 01:43:42,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=324, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:43:42,782 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:42,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:43:42,819 INFO L93 Difference]: Finished difference Result 40 states and 48 transitions. [2021-11-21 01:43:42,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:43:42,820 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-21 01:43:42,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:43:42,821 INFO L225 Difference]: With dead ends: 40 [2021-11-21 01:43:42,821 INFO L226 Difference]: Without dead ends: 27 [2021-11-21 01:43:42,821 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=138, Invalid=324, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:43:42,822 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:43:42,823 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:43:42,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-21 01:43:42,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-21 01:43:42,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:42,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-11-21 01:43:42,830 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 19 [2021-11-21 01:43:42,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:43:42,831 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-11-21 01:43:42,831 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:42,831 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-11-21 01:43:42,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 01:43:42,832 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:43:42,832 INFO L514 BasicCegarLoop]: trace histogram [12, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:43:42,858 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:43:43,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:43:43,033 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:43:43,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:43:43,034 INFO L85 PathProgramCache]: Analyzing trace with hash -1415055627, now seen corresponding path program 4 times [2021-11-21 01:43:43,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:43:43,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944293590] [2021-11-21 01:43:43,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:43:43,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:43:43,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:43:43,246 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:43:43,246 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:43:43,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944293590] [2021-11-21 01:43:43,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944293590] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:43:43,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741063383] [2021-11-21 01:43:43,247 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:43:43,247 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:43:43,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:43:43,254 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:43:43,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:43:43,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:43:43,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:43:43,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:43:43,403 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:43:43,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:43:43,772 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:43:43,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741063383] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:43:43,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [396207470] [2021-11-21 01:43:43,775 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:43:43,776 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:43:43,776 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:43:43,776 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:43:43,777 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:43:43,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:43,823 INFO L354 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2021-11-21 01:43:43,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 38 [2021-11-21 01:43:43,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:43,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:43,891 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:43:43,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:43:44,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:44,007 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 01:43:44,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:44,184 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:43:44,212 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:43:44,213 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 218 treesize of output 217 [2021-11-21 01:43:44,693 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 [2021-11-21 01:43:44,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:43:45,554 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:43:45,945 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:43:45,946 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:43:45,946 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 28 [2021-11-21 01:43:45,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336283161] [2021-11-21 01:43:45,946 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:43:45,947 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 01:43:45,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:43:45,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 01:43:45,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=821, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 01:43:45,949 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 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) [2021-11-21 01:43:46,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:43:46,026 INFO L93 Difference]: Finished difference Result 54 states and 69 transitions. [2021-11-21 01:43:46,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-21 01:43:46,027 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 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 26 [2021-11-21 01:43:46,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:43:46,028 INFO L225 Difference]: With dead ends: 54 [2021-11-21 01:43:46,028 INFO L226 Difference]: Without dead ends: 41 [2021-11-21 01:43:46,030 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=439, Invalid=821, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 01:43:46,031 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:43:46,032 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 35 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:43:46,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-21 01:43:46,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-21 01:43:46,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.05) internal successors, (42), 40 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:46,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2021-11-21 01:43:46,046 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 26 [2021-11-21 01:43:46,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:43:46,047 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2021-11-21 01:43:46,048 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 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) [2021-11-21 01:43:46,048 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2021-11-21 01:43:46,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-21 01:43:46,050 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:43:46,050 INFO L514 BasicCegarLoop]: trace histogram [26, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:43:46,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:43:46,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:43:46,256 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:43:46,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:43:46,256 INFO L85 PathProgramCache]: Analyzing trace with hash 410080405, now seen corresponding path program 5 times [2021-11-21 01:43:46,256 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:43:46,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041617870] [2021-11-21 01:43:46,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:43:46,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:43:46,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:43:46,891 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:43:46,891 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:43:46,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041617870] [2021-11-21 01:43:46,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041617870] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:43:46,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1503154295] [2021-11-21 01:43:46,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:43:46,893 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:43:46,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:43:46,894 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:43:46,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:43:46,949 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:43:46,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:43:46,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-21 01:43:46,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:43:47,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:43:47,296 INFO L354 Elim1Store]: treesize reduction 34, result has 57.0 percent of original size [2021-11-21 01:43:47,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 41 treesize of output 59 [2021-11-21 01:43:47,604 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2021-11-21 01:43:47,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:43:48,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 51 [2021-11-21 01:43:48,213 INFO L354 Elim1Store]: treesize reduction 16, result has 56.8 percent of original size [2021-11-21 01:43:48,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 90 treesize of output 98 [2021-11-21 01:43:48,308 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2021-11-21 01:43:48,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1503154295] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:43:48,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [237570127] [2021-11-21 01:43:48,313 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:43:48,313 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:43:48,314 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:43:48,314 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:43:48,314 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:43:48,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:48,374 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:43:48,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:43:48,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:48,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2021-11-21 01:43:48,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:48,509 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 [2021-11-21 01:43:48,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:48,684 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:43:48,715 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:43:48,715 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 218 treesize of output 217 [2021-11-21 01:43:49,227 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 [2021-11-21 01:43:49,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:43:50,226 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:43:50,796 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:43:50,796 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:43:50,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 11, 11] total 45 [2021-11-21 01:43:50,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046206215] [2021-11-21 01:43:50,797 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:43:50,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-21 01:43:50,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:43:50,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-21 01:43:50,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=523, Invalid=2129, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:43:50,801 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 45 states, 45 states have (on average 1.288888888888889) internal successors, (58), 45 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:51,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:43:51,458 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-11-21 01:43:51,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-21 01:43:51,459 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.288888888888889) internal successors, (58), 45 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-21 01:43:51,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:43:51,463 INFO L225 Difference]: With dead ends: 62 [2021-11-21 01:43:51,463 INFO L226 Difference]: Without dead ends: 48 [2021-11-21 01:43:51,466 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 94 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 916 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=576, Invalid=2616, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 01:43:51,467 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:43:51,468 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 39 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 152 Invalid, 0 Unknown, 53 Unchecked, 0.2s Time] [2021-11-21 01:43:51,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-21 01:43:51,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-11-21 01:43:51,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:51,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2021-11-21 01:43:51,499 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 40 [2021-11-21 01:43:51,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:43:51,500 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2021-11-21 01:43:51,501 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.288888888888889) internal successors, (58), 45 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:51,501 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2021-11-21 01:43:51,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-21 01:43:51,506 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:43:51,506 INFO L514 BasicCegarLoop]: trace histogram [27, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:43:51,545 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-21 01:43:51,723 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:43:51,723 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:43:51,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:43:51,724 INFO L85 PathProgramCache]: Analyzing trace with hash 1421567081, now seen corresponding path program 6 times [2021-11-21 01:43:51,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:43:51,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030391605] [2021-11-21 01:43:51,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:43:51,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:43:51,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:43:52,247 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 01:43:52,247 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:43:52,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030391605] [2021-11-21 01:43:52,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1030391605] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:43:52,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1897040194] [2021-11-21 01:43:52,248 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:43:52,248 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:43:52,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:43:52,249 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:43:52,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:43:52,332 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:43:52,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:43:52,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-21 01:43:52,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:43:52,473 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 01:43:52,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:43:53,877 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 01:43:53,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1897040194] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:43:53,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [159042170] [2021-11-21 01:43:53,880 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:43:53,881 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:43:53,881 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:43:53,881 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:43:53,881 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:43:53,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:53,939 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:43:53,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:43:54,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:54,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2021-11-21 01:43:54,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:54,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:43:54,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:54,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:54,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:43:54,294 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:43:54,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 228 treesize of output 216 [2021-11-21 01:43:54,646 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 [2021-11-21 01:43:54,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:43:55,643 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:43:56,132 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:43:56,132 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:43:56,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 58 [2021-11-21 01:43:56,133 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32428688] [2021-11-21 01:43:56,133 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:43:56,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-21 01:43:56,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:43:56,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-21 01:43:56,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1744, Invalid=2546, Unknown=0, NotChecked=0, Total=4290 [2021-11-21 01:43:56,139 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 59 states, 59 states have (on average 1.1355932203389831) internal successors, (67), 58 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:56,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:43:56,285 INFO L93 Difference]: Finished difference Result 96 states and 126 transitions. [2021-11-21 01:43:56,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-21 01:43:56,286 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.1355932203389831) internal successors, (67), 58 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-21 01:43:56,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:43:56,289 INFO L225 Difference]: With dead ends: 96 [2021-11-21 01:43:56,290 INFO L226 Difference]: Without dead ends: 77 [2021-11-21 01:43:56,293 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 700 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1744, Invalid=2546, Unknown=0, NotChecked=0, Total=4290 [2021-11-21 01:43:56,294 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:43:56,294 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:43:56,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-21 01:43:56,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-11-21 01:43:56,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.0263157894736843) internal successors, (78), 76 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:56,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2021-11-21 01:43:56,326 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 47 [2021-11-21 01:43:56,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:43:56,329 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2021-11-21 01:43:56,329 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.1355932203389831) internal successors, (67), 58 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:43:56,329 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2021-11-21 01:43:56,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-21 01:43:56,333 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:43:56,334 INFO L514 BasicCegarLoop]: trace histogram [56, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:43:56,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:43:56,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 01:43:56,554 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:43:56,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:43:56,555 INFO L85 PathProgramCache]: Analyzing trace with hash 1955363806, now seen corresponding path program 7 times [2021-11-21 01:43:56,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:43:56,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2068955037] [2021-11-21 01:43:56,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:43:56,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:43:56,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:43:58,326 INFO L134 CoverageAnalysis]: Checked inductivity of 1638 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 01:43:58,327 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:43:58,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2068955037] [2021-11-21 01:43:58,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2068955037] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:43:58,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1335837957] [2021-11-21 01:43:58,328 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:43:58,328 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:43:58,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:43:58,330 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:43:58,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:43:58,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:43:58,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-21 01:43:58,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:43:58,689 INFO L134 CoverageAnalysis]: Checked inductivity of 1638 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 01:43:58,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:44:03,053 INFO L134 CoverageAnalysis]: Checked inductivity of 1638 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 01:44:03,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1335837957] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:44:03,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1889800570] [2021-11-21 01:44:03,056 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:44:03,056 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:44:03,057 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:44:03,057 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:44:03,057 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:44:03,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:44:03,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:44:03,107 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:44:03,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:44:03,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:44:03,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2021-11-21 01:44:03,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:44:03,219 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 [2021-11-21 01:44:03,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:44:03,338 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:44:03,359 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:44:03,359 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 218 treesize of output 217 [2021-11-21 01:44:03,770 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 [2021-11-21 01:44:03,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:44:04,712 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:44:05,363 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:44:05,363 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:44:05,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 116 [2021-11-21 01:44:05,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199277512] [2021-11-21 01:44:05,364 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:44:05,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2021-11-21 01:44:05,365 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:44:05,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2021-11-21 01:44:05,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6819, Invalid=8433, Unknown=0, NotChecked=0, Total=15252 [2021-11-21 01:44:05,374 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand has 117 states, 117 states have (on average 1.0683760683760684) internal successors, (125), 116 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:44:05,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:44:05,655 INFO L93 Difference]: Finished difference Result 154 states and 213 transitions. [2021-11-21 01:44:05,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2021-11-21 01:44:05,656 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.0683760683760684) internal successors, (125), 116 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-21 01:44:05,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:44:05,658 INFO L225 Difference]: With dead ends: 154 [2021-11-21 01:44:05,658 INFO L226 Difference]: Without dead ends: 135 [2021-11-21 01:44:05,665 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1425 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=6819, Invalid=8433, Unknown=0, NotChecked=0, Total=15252 [2021-11-21 01:44:05,668 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:44:05,669 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 49 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:44:05,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-21 01:44:05,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-11-21 01:44:05,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 1.0149253731343284) internal successors, (136), 134 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:44:05,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2021-11-21 01:44:05,706 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 76 [2021-11-21 01:44:05,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:44:05,707 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2021-11-21 01:44:05,707 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 1.0683760683760684) internal successors, (125), 116 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:44:05,708 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2021-11-21 01:44:05,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-21 01:44:05,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:44:05,711 INFO L514 BasicCegarLoop]: trace histogram [114, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:44:05,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:44:05,939 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-21 01:44:05,939 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:44:05,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:44:05,940 INFO L85 PathProgramCache]: Analyzing trace with hash 633216958, now seen corresponding path program 8 times [2021-11-21 01:44:05,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:44:05,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169363515] [2021-11-21 01:44:05,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:44:05,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:44:06,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:44:11,694 INFO L134 CoverageAnalysis]: Checked inductivity of 6597 backedges. 0 proven. 6555 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 01:44:11,694 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:44:11,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169363515] [2021-11-21 01:44:11,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169363515] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:44:11,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [450210743] [2021-11-21 01:44:11,695 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:44:11,695 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:44:11,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:44:11,696 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:44:11,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:44:11,887 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-21 01:44:11,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:44:11,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-21 01:44:11,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:44:12,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:44:15,479 INFO L354 Elim1Store]: treesize reduction 116, result has 59.9 percent of original size [2021-11-21 01:44:15,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 88 treesize of output 212 [2021-11-21 01:44:16,635 INFO L134 CoverageAnalysis]: Checked inductivity of 6597 backedges. 0 proven. 269 refuted. 0 times theorem prover too weak. 6328 trivial. 0 not checked. [2021-11-21 01:44:16,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:44:21,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 119 treesize of output 107 [2021-11-21 01:44:22,156 INFO L354 Elim1Store]: treesize reduction 74, result has 63.2 percent of original size [2021-11-21 01:44:22,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 193 treesize of output 291 [2021-11-21 01:44:22,736 INFO L134 CoverageAnalysis]: Checked inductivity of 6597 backedges. 0 proven. 41 refuted. 1 times theorem prover too weak. 6555 trivial. 0 not checked. [2021-11-21 01:44:22,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [450210743] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:44:22,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [550268042] [2021-11-21 01:44:22,739 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:44:22,740 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:44:22,740 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:44:22,740 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:44:22,741 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:44:22,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:44:22,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:44:22,802 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:44:22,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:44:22,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:44:22,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2021-11-21 01:44:22,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:44:22,970 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 [2021-11-21 01:44:23,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:44:23,097 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:44:23,121 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 01:44:23,122 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 218 treesize of output 217 [2021-11-21 01:44:23,584 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 [2021-11-21 01:44:23,801 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 15 treesize of output 11 [2021-11-21 01:44:24,632 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:44:25,796 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:44:25,796 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:44:25,796 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [116, 19, 17] total 146 [2021-11-21 01:44:25,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924371754] [2021-11-21 01:44:25,797 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:44:25,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 146 states [2021-11-21 01:44:25,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:44:25,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2021-11-21 01:44:25,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7160, Invalid=16095, Unknown=1, NotChecked=0, Total=23256 [2021-11-21 01:44:25,806 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand has 146 states, 146 states have (on average 1.095890410958904) internal successors, (160), 146 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:44:34,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:44:34,955 INFO L93 Difference]: Finished difference Result 168 states and 176 transitions. [2021-11-21 01:44:34,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2021-11-21 01:44:34,956 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 146 states have (on average 1.095890410958904) internal successors, (160), 146 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 134 [2021-11-21 01:44:34,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:44:34,959 INFO L225 Difference]: With dead ends: 168 [2021-11-21 01:44:34,959 INFO L226 Difference]: Without dead ends: 148 [2021-11-21 01:44:34,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 363 SyntacticMatches, 2 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5380 ImplicationChecksByTransitivity, 22.6s TimeCoverageRelationStatistics Valid=7367, Invalid=19362, Unknown=3, NotChecked=0, Total=26732 [2021-11-21 01:44:34,964 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 31 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 160 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:44:34,964 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 56 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 303 Invalid, 0 Unknown, 160 Unchecked, 0.3s Time] [2021-11-21 01:44:34,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-21 01:44:34,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2021-11-21 01:44:34,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 147 states have (on average 1.0136054421768708) internal successors, (149), 147 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:44:34,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2021-11-21 01:44:34,993 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 134 [2021-11-21 01:44:34,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:44:34,994 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2021-11-21 01:44:34,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 146 states, 146 states have (on average 1.095890410958904) internal successors, (160), 146 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:44:34,994 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2021-11-21 01:44:34,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-21 01:44:34,997 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:44:34,997 INFO L514 BasicCegarLoop]: trace histogram [115, 13, 12, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:44:35,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:44:35,219 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:44:35,219 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:44:35,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:44:35,220 INFO L85 PathProgramCache]: Analyzing trace with hash 2070549627, now seen corresponding path program 9 times [2021-11-21 01:44:35,220 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:44:35,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368527158] [2021-11-21 01:44:35,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:44:35,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:44:35,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:44:41,487 INFO L134 CoverageAnalysis]: Checked inductivity of 6826 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-21 01:44:41,487 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:44:41,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368527158] [2021-11-21 01:44:41,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [368527158] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:44:41,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838603365] [2021-11-21 01:44:41,488 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:44:41,488 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:44:41,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:44:41,489 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:44:41,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:44:41,648 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:44:41,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:44:41,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 810 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-21 01:44:41,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:44:42,139 INFO L134 CoverageAnalysis]: Checked inductivity of 6826 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-21 01:44:42,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:45:00,171 INFO L134 CoverageAnalysis]: Checked inductivity of 6826 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-21 01:45:00,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838603365] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:45:00,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [745585018] [2021-11-21 01:45:00,174 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:45:00,174 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:45:00,175 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:45:00,175 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:45:00,175 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:45:00,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:45:00,218 INFO L354 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2021-11-21 01:45:00,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 38 [2021-11-21 01:45:00,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:45:00,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:45:00,281 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:45:00,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:45:00,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:45:00,422 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 [2021-11-21 01:45:00,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:45:00,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:45:00,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:45:00,536 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:45:00,537 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 228 treesize of output 216 [2021-11-21 01:45:00,788 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 [2021-11-21 01:45:00,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:45:01,890 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:45:02,805 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:45:02,805 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:45:02,805 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 234 [2021-11-21 01:45:02,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996384943] [2021-11-21 01:45:02,806 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:45:02,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 235 states [2021-11-21 01:45:02,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:45:02,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 235 interpolants. [2021-11-21 01:45:02,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27528, Invalid=30794, Unknown=0, NotChecked=0, Total=58322 [2021-11-21 01:45:02,825 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand has 235 states, 235 states have (on average 1.0340425531914894) internal successors, (243), 234 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:45:03,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:45:03,606 INFO L93 Difference]: Finished difference Result 296 states and 414 transitions. [2021-11-21 01:45:03,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 234 states. [2021-11-21 01:45:03,608 INFO L78 Accepts]: Start accepts. Automaton has has 235 states, 235 states have (on average 1.0340425531914894) internal successors, (243), 234 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 147 [2021-11-21 01:45:03,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:45:03,611 INFO L225 Difference]: With dead ends: 296 [2021-11-21 01:45:03,611 INFO L226 Difference]: Without dead ends: 265 [2021-11-21 01:45:03,616 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 316 SyntacticMatches, 0 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2900 ImplicationChecksByTransitivity, 24.3s TimeCoverageRelationStatistics Valid=27528, Invalid=30794, Unknown=0, NotChecked=0, Total=58322 [2021-11-21 01:45:03,618 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:45:03,618 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 35 Invalid, 365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:45:03,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-11-21 01:45:03,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 265. [2021-11-21 01:45:03,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 264 states have (on average 1.0075757575757576) internal successors, (266), 264 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:45:03,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 266 transitions. [2021-11-21 01:45:03,664 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 266 transitions. Word has length 147 [2021-11-21 01:45:03,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:45:03,664 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 266 transitions. [2021-11-21 01:45:03,665 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 235 states, 235 states have (on average 1.0340425531914894) internal successors, (243), 234 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:45:03,665 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 266 transitions. [2021-11-21 01:45:03,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2021-11-21 01:45:03,670 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:45:03,671 INFO L514 BasicCegarLoop]: trace histogram [232, 13, 12, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:45:03,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:45:03,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 01:45:03,887 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:45:03,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:45:03,888 INFO L85 PathProgramCache]: Analyzing trace with hash -1516090896, now seen corresponding path program 10 times [2021-11-21 01:45:03,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:45:03,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916580215] [2021-11-21 01:45:03,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:45:03,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:45:04,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:45:28,561 INFO L134 CoverageAnalysis]: Checked inductivity of 27184 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-21 01:45:28,561 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:45:28,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916580215] [2021-11-21 01:45:28,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916580215] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:45:28,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1000089548] [2021-11-21 01:45:28,562 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:45:28,563 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:45:28,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:45:28,564 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:45:28,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:45:28,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:45:28,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 1512 conjuncts, 234 conjunts are in the unsatisfiable core [2021-11-21 01:45:28,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:45:29,772 INFO L134 CoverageAnalysis]: Checked inductivity of 27184 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-21 01:45:29,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:46:32,076 INFO L134 CoverageAnalysis]: Checked inductivity of 27184 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-21 01:46:32,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1000089548] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:46:32,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1226355619] [2021-11-21 01:46:32,078 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:46:32,079 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:46:32,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:46:32,079 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:46:32,080 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:46:32,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:46:32,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:46:32,135 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:46:32,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:46:32,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:46:32,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2021-11-21 01:46:32,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:46:32,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 01:46:32,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:46:32,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:46:32,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:46:32,416 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:46:32,417 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 228 treesize of output 216 [2021-11-21 01:46:32,729 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 [2021-11-21 01:46:32,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:46:33,679 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:46:35,215 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:46:35,215 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:46:35,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [234, 234, 234] total 468 [2021-11-21 01:46:35,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98640619] [2021-11-21 01:46:35,216 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:46:35,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 469 states [2021-11-21 01:46:35,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:46:35,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 469 interpolants. [2021-11-21 01:46:35,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109779, Invalid=116321, Unknown=0, NotChecked=0, Total=226100 [2021-11-21 01:46:35,288 INFO L87 Difference]: Start difference. First operand 265 states and 266 transitions. Second operand has 469 states, 469 states have (on average 1.0170575692963753) internal successors, (477), 468 states have internal predecessors, (477), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:46:39,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:46:39,646 INFO L93 Difference]: Finished difference Result 530 states and 765 transitions. [2021-11-21 01:46:39,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 468 states. [2021-11-21 01:46:39,648 INFO L78 Accepts]: Start accepts. Automaton has has 469 states, 469 states have (on average 1.0170575692963753) internal successors, (477), 468 states have internal predecessors, (477), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 264 [2021-11-21 01:46:39,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:46:39,651 INFO L225 Difference]: With dead ends: 530 [2021-11-21 01:46:39,651 INFO L226 Difference]: Without dead ends: 499 [2021-11-21 01:46:39,665 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1024 GetRequests, 550 SyntacticMatches, 0 SemanticMatches, 474 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5825 ImplicationChecksByTransitivity, 86.6s TimeCoverageRelationStatistics Valid=109779, Invalid=116321, Unknown=0, NotChecked=0, Total=226100 [2021-11-21 01:46:39,666 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 477 mSolverCounterSat, 239 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 239 IncrementalHoareTripleChecker+Valid, 477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:46:39,666 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 63 Invalid, 716 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [239 Valid, 477 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:46:39,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 499 states. [2021-11-21 01:46:39,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 499 to 499. [2021-11-21 01:46:39,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 498 states have (on average 1.0040160642570282) internal successors, (500), 498 states have internal predecessors, (500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:46:39,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 500 transitions. [2021-11-21 01:46:39,728 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 500 transitions. Word has length 264 [2021-11-21 01:46:39,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:46:39,729 INFO L470 AbstractCegarLoop]: Abstraction has 499 states and 500 transitions. [2021-11-21 01:46:39,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 469 states, 469 states have (on average 1.0170575692963753) internal successors, (477), 468 states have internal predecessors, (477), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:46:39,730 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 500 transitions. [2021-11-21 01:46:39,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2021-11-21 01:46:39,741 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:46:39,741 INFO L514 BasicCegarLoop]: trace histogram [466, 13, 12, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:46:39,777 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 01:46:39,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:46:39,955 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:46:39,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:46:39,956 INFO L85 PathProgramCache]: Analyzing trace with hash 415258320, now seen corresponding path program 11 times [2021-11-21 01:46:39,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:46:39,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1078205405] [2021-11-21 01:46:39,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:46:39,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:46:41,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:47:56,789 INFO L134 CoverageAnalysis]: Checked inductivity of 108967 backedges. 0 proven. 108811 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-21 01:47:56,789 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:47:56,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1078205405] [2021-11-21 01:47:56,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1078205405] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:47:56,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410330826] [2021-11-21 01:47:56,789 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:47:56,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:56,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:47:56,791 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:47:56,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:47:57,595 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-21 01:47:57,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:47:57,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-21 01:47:57,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:47:58,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:48:13,818 INFO L354 Elim1Store]: treesize reduction 914, result has 8.3 percent of original size [2021-11-21 01:48:13,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 13 select indices, 13 select index equivalence classes, 0 disjoint index pairs (out of 78 index pairs), introduced 13 new quantified variables, introduced 78 case distinctions, treesize of input 134 treesize of output 133 [2021-11-21 01:48:15,101 INFO L134 CoverageAnalysis]: Checked inductivity of 108967 backedges. 0 proven. 2014 refuted. 0 times theorem prover too weak. 106953 trivial. 0 not checked. [2021-11-21 01:48:15,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:48:26,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 191 treesize of output 167 [2021-11-21 01:48:26,377 INFO L354 Elim1Store]: treesize reduction 770, result has 0.1 percent of original size [2021-11-21 01:48:26,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 319 treesize of output 273 [2021-11-21 01:48:27,199 INFO L134 CoverageAnalysis]: Checked inductivity of 108967 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 108811 trivial. 0 not checked. [2021-11-21 01:48:27,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410330826] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:48:27,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1897170215] [2021-11-21 01:48:27,201 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:48:27,201 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:48:27,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:48:27,202 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:48:27,202 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:48:27,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:27,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:27,255 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 01:48:27,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 01:48:27,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:27,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2021-11-21 01:48:27,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:27,367 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 [2021-11-21 01:48:27,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:27,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:27,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:48:27,494 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 01:48:27,494 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 228 treesize of output 216 [2021-11-21 01:48:27,698 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 [2021-11-21 01:48:27,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-21 01:48:28,623 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:48:31,513 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:48:31,513 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:48:31,513 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [468, 33, 29] total 524 [2021-11-21 01:48:31,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092892938] [2021-11-21 01:48:31,514 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:48:31,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 524 states [2021-11-21 01:48:31,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:48:31,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 524 interpolants. [2021-11-21 01:48:31,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111783, Invalid=169647, Unknown=0, NotChecked=0, Total=281430 [2021-11-21 01:48:31,540 INFO L87 Difference]: Start difference. First operand 499 states and 500 transitions. Second operand has 524 states, 524 states have (on average 1.0267175572519085) internal successors, (538), 524 states have internal predecessors, (538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:49:02,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:49:02,515 INFO L93 Difference]: Finished difference Result 570 states and 585 transitions. [2021-11-21 01:49:02,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 532 states. [2021-11-21 01:49:02,516 INFO L78 Accepts]: Start accepts. Automaton has has 524 states, 524 states have (on average 1.0267175572519085) internal successors, (538), 524 states have internal predecessors, (538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 498 [2021-11-21 01:49:02,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:49:02,521 INFO L225 Difference]: With dead ends: 570 [2021-11-21 01:49:02,521 INFO L226 Difference]: Without dead ends: 526 [2021-11-21 01:49:02,549 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1999 GetRequests, 1429 SyntacticMatches, 2 SemanticMatches, 568 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34571 ImplicationChecksByTransitivity, 129.5s TimeCoverageRelationStatistics Valid=113118, Invalid=211212, Unknown=0, NotChecked=0, Total=324330 [2021-11-21 01:49:02,550 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 183 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 1539 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 1698 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 1539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:49:02,550 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 72 Invalid, 1698 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 1539 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-21 01:49:02,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2021-11-21 01:49:02,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 526. [2021-11-21 01:49:02,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 526 states, 525 states have (on average 1.0038095238095237) internal successors, (527), 525 states have internal predecessors, (527), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:49:02,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 526 states to 526 states and 527 transitions. [2021-11-21 01:49:02,634 INFO L78 Accepts]: Start accepts. Automaton has 526 states and 527 transitions. Word has length 498 [2021-11-21 01:49:02,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:49:02,635 INFO L470 AbstractCegarLoop]: Abstraction has 526 states and 527 transitions. [2021-11-21 01:49:02,636 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 524 states, 524 states have (on average 1.0267175572519085) internal successors, (538), 524 states have internal predecessors, (538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:49:02,636 INFO L276 IsEmpty]: Start isEmpty. Operand 526 states and 527 transitions. [2021-11-21 01:49:02,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 526 [2021-11-21 01:49:02,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:49:02,653 INFO L514 BasicCegarLoop]: trace histogram [467, 26, 25, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:49:02,697 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 01:49:02,867 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 01:49:02,867 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:49:02,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:49:02,868 INFO L85 PathProgramCache]: Analyzing trace with hash -20598334, now seen corresponding path program 12 times [2021-11-21 01:49:02,868 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:49:02,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079806918] [2021-11-21 01:49:02,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:49:02,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:49:04,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:33,476 INFO L134 CoverageAnalysis]: Checked inductivity of 109928 backedges. 0 proven. 109278 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2021-11-21 01:50:33,476 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:33,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079806918] [2021-11-21 01:50:33,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079806918] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:33,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389307036] [2021-11-21 01:50:33,476 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:50:33,477 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:33,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:33,478 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:33,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_04bdaba2-81f1-4b85-b226-f2e177df2300/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 01:50:34,020 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:50:34,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:50:34,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 2987 conjuncts, 469 conjunts are in the unsatisfiable core [2021-11-21 01:50:34,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:35,422 INFO L134 CoverageAnalysis]: Checked inductivity of 109928 backedges. 0 proven. 109278 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2021-11-21 01:50:35,422 INFO L328 TraceCheckSpWp]: Computing backward predicates...