./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/reducercommutativity/max60-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/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_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/reducercommutativity/max60-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/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_f8847bfe-7309-4de3-b727-49495fc51151/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 6dbb3c8dbc9ecf6e4f72a22b68126998e2267c3eb50185a59b3a9d03df64099d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:13:40,633 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:13:40,635 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:13:40,680 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:13:40,680 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:13:40,682 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:13:40,684 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:13:40,686 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:13:40,689 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:13:40,690 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:13:40,691 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:13:40,693 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:13:40,693 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:13:40,695 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:13:40,697 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:13:40,699 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:13:40,700 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:13:40,701 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:13:40,704 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:13:40,707 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:13:40,709 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:13:40,714 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:13:40,716 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:13:40,717 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:13:40,721 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:13:40,722 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:13:40,722 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:13:40,723 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:13:40,724 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:13:40,725 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:13:40,726 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:13:40,727 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:13:40,728 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:13:40,729 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:13:40,730 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:13:40,731 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:13:40,732 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:13:40,732 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:13:40,733 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:13:40,734 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:13:40,735 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:13:40,736 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:13:40,786 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:13:40,786 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:13:40,787 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:13:40,787 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:13:40,788 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:13:40,788 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:13:40,789 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:13:40,789 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:13:40,790 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:13:40,790 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:13:40,790 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:13:40,791 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:13:40,791 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:13:40,791 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:13:40,792 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:13:40,792 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:13:40,793 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:13:40,793 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:13:40,794 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:13:40,798 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:13:40,798 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:13:40,798 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:13:40,798 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:13:40,799 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:13:40,799 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:13:40,799 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:13:40,801 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:13:40,801 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:13:40,802 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:13:40,802 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:13:40,802 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:13:40,802 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:13:40,803 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:13:40,803 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:13:40,803 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:13:40,803 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:13:40,804 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:13:40,804 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:13:40,805 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:13:40,805 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:13:40,805 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:13:40,805 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_f8847bfe-7309-4de3-b727-49495fc51151/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6dbb3c8dbc9ecf6e4f72a22b68126998e2267c3eb50185a59b3a9d03df64099d [2021-11-20 23:13:41,140 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:13:41,170 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:13:41,172 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:13:41,173 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:13:41,174 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:13:41,176 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/reducercommutativity/max60-2.i [2021-11-20 23:13:41,246 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/data/22af46883/b0692f87986e4a0491a40f25d16cadb6/FLAG276634508 [2021-11-20 23:13:41,765 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:13:41,769 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/sv-benchmarks/c/reducercommutativity/max60-2.i [2021-11-20 23:13:41,777 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/data/22af46883/b0692f87986e4a0491a40f25d16cadb6/FLAG276634508 [2021-11-20 23:13:42,115 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/data/22af46883/b0692f87986e4a0491a40f25d16cadb6 [2021-11-20 23:13:42,117 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:13:42,118 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:13:42,120 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:13:42,120 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:13:42,137 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:13:42,138 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:13:42" (1/1) ... [2021-11-20 23:13:42,139 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4802e052 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:42, skipping insertion in model container [2021-11-20 23:13:42,139 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:13:42" (1/1) ... [2021-11-20 23:13:42,146 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:13:42,168 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:13:42,341 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_f8847bfe-7309-4de3-b727-49495fc51151/sv-benchmarks/c/reducercommutativity/max60-2.i[1290,1303] [2021-11-20 23:13:42,345 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:13:42,352 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:13:42,373 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_f8847bfe-7309-4de3-b727-49495fc51151/sv-benchmarks/c/reducercommutativity/max60-2.i[1290,1303] [2021-11-20 23:13:42,374 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:13:42,388 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:13:42,389 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:42 WrapperNode [2021-11-20 23:13:42,389 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:13:42,390 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:13:42,391 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:13:42,391 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:13:42,399 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:42" (1/1) ... [2021-11-20 23:13:42,406 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:42" (1/1) ... [2021-11-20 23:13:42,426 INFO L137 Inliner]: procedures = 16, calls = 23, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 67 [2021-11-20 23:13:42,427 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:13:42,428 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:13:42,428 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:13:42,428 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:13:42,436 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:42" (1/1) ... [2021-11-20 23:13:42,437 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:42" (1/1) ... [2021-11-20 23:13:42,440 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:42" (1/1) ... [2021-11-20 23:13:42,440 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:42" (1/1) ... [2021-11-20 23:13:42,447 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:42" (1/1) ... [2021-11-20 23:13:42,451 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:42" (1/1) ... [2021-11-20 23:13:42,453 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:42" (1/1) ... [2021-11-20 23:13:42,455 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:13:42,456 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:13:42,456 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:13:42,456 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:13:42,457 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:42" (1/1) ... [2021-11-20 23:13:42,470 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:13:42,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:42,491 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:13:42,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:13:42,548 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:13:42,548 INFO L130 BoogieDeclarations]: Found specification of procedure max [2021-11-20 23:13:42,549 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2021-11-20 23:13:42,549 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:13:42,549 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:13:42,549 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:13:42,549 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:13:42,550 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:13:42,550 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:13:42,550 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:13:42,608 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:13:42,609 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:13:42,776 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:13:42,851 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:13:42,851 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-20 23:13:42,854 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:13:42 BoogieIcfgContainer [2021-11-20 23:13:42,854 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:13:42,856 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:13:42,856 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:13:42,859 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:13:42,860 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:13:42" (1/3) ... [2021-11-20 23:13:42,860 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40036cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:13:42, skipping insertion in model container [2021-11-20 23:13:42,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:42" (2/3) ... [2021-11-20 23:13:42,861 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40036cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:13:42, skipping insertion in model container [2021-11-20 23:13:42,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:13:42" (3/3) ... [2021-11-20 23:13:42,868 INFO L111 eAbstractionObserver]: Analyzing ICFG max60-2.i [2021-11-20 23:13:42,873 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:13:42,873 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:13:42,923 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:13:42,930 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 23:13:42,931 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:13:42,955 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:13:42,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 23:13:42,960 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:42,961 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:42,962 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:42,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:42,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1438378950, now seen corresponding path program 1 times [2021-11-20 23:13:42,977 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:42,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1774370995] [2021-11-20 23:13:42,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:42,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:43,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:43,153 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:13:43,154 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:43,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1774370995] [2021-11-20 23:13:43,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1774370995] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:43,155 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:43,156 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:43,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146987302] [2021-11-20 23:13:43,159 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:43,163 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:13:43,163 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:43,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:13:43,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:13:43,192 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 23:13:43,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:43,237 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2021-11-20 23:13:43,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:13:43,246 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2021-11-20 23:13:43,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:43,253 INFO L225 Difference]: With dead ends: 33 [2021-11-20 23:13:43,262 INFO L226 Difference]: Without dead ends: 16 [2021-11-20 23:13:43,265 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:13:43,272 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:43,276 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:13:43,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-20 23:13:43,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-20 23:13:43,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:13:43,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-20 23:13:43,318 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 20 [2021-11-20 23:13:43,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:43,319 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-20 23:13:43,320 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 23:13:43,322 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-20 23:13:43,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-20 23:13:43,326 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:43,326 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:43,327 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:13:43,328 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:43,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:43,331 INFO L85 PathProgramCache]: Analyzing trace with hash -1900472846, now seen corresponding path program 1 times [2021-11-20 23:13:43,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:43,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [569466150] [2021-11-20 23:13:43,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:43,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:43,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:43,411 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:13:43,411 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:43,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [569466150] [2021-11-20 23:13:43,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [569466150] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:13:43,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528074487] [2021-11-20 23:13:43,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:43,412 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:43,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:43,414 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:13:43,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:13:43,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:43,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:13:43,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:13:43,696 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:13:43,696 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:13:43,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [528074487] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:43,697 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:13:43,697 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2021-11-20 23:13:43,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27934968] [2021-11-20 23:13:43,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:43,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:13:43,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:43,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:13:43,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:13:43,700 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 23:13:43,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:43,722 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2021-11-20 23:13:43,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:13:43,723 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2021-11-20 23:13:43,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:43,724 INFO L225 Difference]: With dead ends: 29 [2021-11-20 23:13:43,724 INFO L226 Difference]: Without dead ends: 17 [2021-11-20 23:13:43,725 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:13:43,726 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:43,727 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:13:43,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-20 23:13:43,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-20 23:13:43,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:13:43,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-11-20 23:13:43,733 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 21 [2021-11-20 23:13:43,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:43,734 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-11-20 23:13:43,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 23:13:43,734 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-11-20 23:13:43,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-20 23:13:43,735 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:43,736 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:43,770 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-20 23:13:43,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:43,963 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:43,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:43,964 INFO L85 PathProgramCache]: Analyzing trace with hash -1710545452, now seen corresponding path program 1 times [2021-11-20 23:13:43,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:43,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195271613] [2021-11-20 23:13:43,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:43,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:43,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:44,029 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:13:44,030 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:44,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195271613] [2021-11-20 23:13:44,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1195271613] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:13:44,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802833139] [2021-11-20 23:13:44,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:44,033 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:44,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:44,047 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:13:44,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:13:44,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:44,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:13:44,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:13:44,220 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:13:44,221 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:13:44,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802833139] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:44,224 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:13:44,224 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2021-11-20 23:13:44,224 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949791900] [2021-11-20 23:13:44,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:44,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:13:44,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:44,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:13:44,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:13:44,228 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 23:13:44,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:44,255 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2021-11-20 23:13:44,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:13:44,256 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-11-20 23:13:44,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:44,257 INFO L225 Difference]: With dead ends: 27 [2021-11-20 23:13:44,257 INFO L226 Difference]: Without dead ends: 18 [2021-11-20 23:13:44,259 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:13:44,264 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:44,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:13:44,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-20 23:13:44,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-20 23:13:44,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:13:44,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2021-11-20 23:13:44,283 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 24 [2021-11-20 23:13:44,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:44,285 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2021-11-20 23:13:44,285 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 23:13:44,285 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2021-11-20 23:13:44,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-20 23:13:44,287 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:44,287 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:44,326 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-20 23:13:44,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:44,510 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:44,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:44,510 INFO L85 PathProgramCache]: Analyzing trace with hash -1965911522, now seen corresponding path program 1 times [2021-11-20 23:13:44,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:44,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [967790419] [2021-11-20 23:13:44,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:44,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:44,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:44,566 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-20 23:13:44,567 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:44,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [967790419] [2021-11-20 23:13:44,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [967790419] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:13:44,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622251337] [2021-11-20 23:13:44,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:44,571 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:44,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:44,576 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:13:44,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:13:44,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:44,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:13:44,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:13:44,750 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-20 23:13:44,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:13:44,844 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-20 23:13:44,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [622251337] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:13:44,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1663624336] [2021-11-20 23:13:44,861 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:13:44,862 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:13:44,866 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:13:44,872 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:13:44,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:13:44,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:44,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:44,997 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:13:44,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:13:45,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:45,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-20 23:13:45,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:45,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:13:45,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:45,269 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:13:45,293 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:13:45,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2021-11-20 23:13:45,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:13:45,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:45,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:13:46,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:46,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-20 23:13:46,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:46,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:46,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:46,422 INFO L354 Elim1Store]: treesize reduction 65, result has 27.0 percent of original size [2021-11-20 23:13:46,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 62 [2021-11-20 23:13:46,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:46,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:13:46,599 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 13 treesize of output 9 [2021-11-20 23:13:47,175 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-20 23:13:47,364 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:13:48,032 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:13:48,032 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:13:48,032 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 4] total 7 [2021-11-20 23:13:48,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861200470] [2021-11-20 23:13:48,032 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:13:48,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:13:48,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:48,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:13:48,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-11-20 23:13:48,034 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-20 23:13:48,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:48,067 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2021-11-20 23:13:48,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:13:48,067 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 25 [2021-11-20 23:13:48,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:48,068 INFO L225 Difference]: With dead ends: 36 [2021-11-20 23:13:48,068 INFO L226 Difference]: Without dead ends: 21 [2021-11-20 23:13:48,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-11-20 23:13:48,070 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:48,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:13:48,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-20 23:13:48,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-20 23:13:48,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:13:48,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-20 23:13:48,075 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 25 [2021-11-20 23:13:48,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:48,075 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-20 23:13:48,076 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-20 23:13:48,076 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-20 23:13:48,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:13:48,077 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:48,077 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:48,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:13:48,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:48,292 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:48,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:48,292 INFO L85 PathProgramCache]: Analyzing trace with hash -275773198, now seen corresponding path program 2 times [2021-11-20 23:13:48,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:48,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537297940] [2021-11-20 23:13:48,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:48,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:48,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:48,350 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:13:48,351 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:48,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537297940] [2021-11-20 23:13:48,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [537297940] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:13:48,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1322915599] [2021-11-20 23:13:48,351 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:13:48,351 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:48,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:48,352 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:13:48,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:13:48,403 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:13:48,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:13:48,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:13:48,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:13:48,465 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:13:48,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:13:48,535 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:13:48,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1322915599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:13:48,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [84365101] [2021-11-20 23:13:48,538 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:13:48,539 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:13:48,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:13:48,539 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:13:48,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:13:48,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:48,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:48,574 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:13:48,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:13:48,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:48,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-20 23:13:48,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:48,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:13:48,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:48,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:48,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:48,758 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:13:48,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-20 23:13:48,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:13:49,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:49,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:13:49,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:49,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:49,477 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:13:49,478 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-20 23:13:49,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:49,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:49,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:49,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:49,549 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-20 23:13:49,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-20 23:13:49,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:49,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:13:49,664 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 13 treesize of output 9 [2021-11-20 23:13:50,090 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-20 23:13:50,246 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:13:50,688 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:13:50,688 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:13:50,688 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-20 23:13:50,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790128933] [2021-11-20 23:13:50,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:13:50,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:13:50,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:50,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:13:50,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-11-20 23:13:50,690 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:13:50,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:50,718 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2021-11-20 23:13:50,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:13:50,719 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 28 [2021-11-20 23:13:50,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:50,721 INFO L225 Difference]: With dead ends: 38 [2021-11-20 23:13:50,723 INFO L226 Difference]: Without dead ends: 24 [2021-11-20 23:13:50,723 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-11-20 23:13:50,725 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:50,725 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:13:50,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-20 23:13:50,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-20 23:13:50,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:13:50,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-11-20 23:13:50,737 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 28 [2021-11-20 23:13:50,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:50,740 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-11-20 23:13:50,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:13:50,741 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-11-20 23:13:50,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-20 23:13:50,742 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:50,742 INFO L514 BasicCegarLoop]: trace histogram [12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:50,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:13:50,970 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:50,971 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:50,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:50,971 INFO L85 PathProgramCache]: Analyzing trace with hash 1700893048, now seen corresponding path program 3 times [2021-11-20 23:13:50,971 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:50,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652590199] [2021-11-20 23:13:50,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:50,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:51,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:51,089 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-20 23:13:51,090 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:51,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652590199] [2021-11-20 23:13:51,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652590199] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:13:51,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260257055] [2021-11-20 23:13:51,090 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:13:51,091 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:51,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:51,092 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:13:51,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:13:51,158 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:13:51,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:13:51,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 23:13:51,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:13:51,249 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-20 23:13:51,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:13:51,350 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-20 23:13:51,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260257055] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:13:51,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [191005829] [2021-11-20 23:13:51,354 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:13:51,354 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:13:51,355 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:13:51,355 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:13:51,355 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:13:51,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:51,387 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:13:51,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:13:51,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:51,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:51,414 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:13:51,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:13:51,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:51,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:13:51,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:51,534 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:13:51,554 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:13:51,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2021-11-20 23:13:51,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:13:52,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:52,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:13:52,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:52,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:52,313 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:13:52,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-20 23:13:52,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:52,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:52,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:52,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:52,372 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-20 23:13:52,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-20 23:13:52,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:52,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:13:52,479 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 13 treesize of output 9 [2021-11-20 23:13:52,934 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-20 23:13:53,071 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:13:53,520 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:13:53,520 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:13:53,520 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 7] total 14 [2021-11-20 23:13:53,520 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363645572] [2021-11-20 23:13:53,520 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:13:53,521 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 23:13:53,521 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:53,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 23:13:53,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=580, Unknown=0, NotChecked=0, Total=702 [2021-11-20 23:13:53,522 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-20 23:13:53,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:53,593 INFO L93 Difference]: Finished difference Result 49 states and 63 transitions. [2021-11-20 23:13:53,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 23:13:53,593 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 37 [2021-11-20 23:13:53,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:53,594 INFO L225 Difference]: With dead ends: 49 [2021-11-20 23:13:53,594 INFO L226 Difference]: Without dead ends: 31 [2021-11-20 23:13:53,595 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=122, Invalid=580, Unknown=0, NotChecked=0, Total=702 [2021-11-20 23:13:53,596 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:53,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:13:53,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-20 23:13:53,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-20 23:13:53,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:13:53,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2021-11-20 23:13:53,609 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 37 [2021-11-20 23:13:53,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:53,610 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2021-11-20 23:13:53,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-20 23:13:53,611 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2021-11-20 23:13:53,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:13:53,612 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:53,612 INFO L514 BasicCegarLoop]: trace histogram [12, 10, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:53,633 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-20 23:13:53,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 23:13:53,834 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:53,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:53,834 INFO L85 PathProgramCache]: Analyzing trace with hash -1200915706, now seen corresponding path program 4 times [2021-11-20 23:13:53,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:53,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761292708] [2021-11-20 23:13:53,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:53,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:53,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:54,019 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-20 23:13:54,019 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:54,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761292708] [2021-11-20 23:13:54,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761292708] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:13:54,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210144293] [2021-11-20 23:13:54,020 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:13:54,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:54,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:54,021 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:13:54,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:13:54,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:54,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 23:13:54,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:13:54,164 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-20 23:13:54,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:13:54,394 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-20 23:13:54,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1210144293] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:13:54,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1423757069] [2021-11-20 23:13:54,398 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:13:54,398 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:13:54,398 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:13:54,399 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:13:54,399 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:13:54,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:54,424 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:13:54,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:13:54,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:54,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:54,459 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:13:54,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:13:54,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:54,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:13:54,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:54,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:54,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:54,590 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:13:54,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-20 23:13:54,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:13:54,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:54,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:13:55,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:55,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:55,211 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:13:55,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-20 23:13:55,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:55,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:55,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:55,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:55,297 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-20 23:13:55,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-20 23:13:55,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:55,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:13:55,452 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 13 treesize of output 9 [2021-11-20 23:13:55,823 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-20 23:13:55,973 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:13:56,536 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:13:56,536 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:13:56,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 25 [2021-11-20 23:13:56,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31754277] [2021-11-20 23:13:56,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:13:56,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-20 23:13:56,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:56,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-20 23:13:56,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=352, Invalid=1054, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 23:13:56,539 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 25 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-20 23:13:56,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:56,603 INFO L93 Difference]: Finished difference Result 62 states and 81 transitions. [2021-11-20 23:13:56,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 23:13:56,604 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 44 [2021-11-20 23:13:56,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:56,605 INFO L225 Difference]: With dead ends: 62 [2021-11-20 23:13:56,605 INFO L226 Difference]: Without dead ends: 43 [2021-11-20 23:13:56,606 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 508 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=352, Invalid=1054, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 23:13:56,607 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:56,608 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 48 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:13:56,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-20 23:13:56,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-11-20 23:13:56,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:13:56,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2021-11-20 23:13:56,614 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 44 [2021-11-20 23:13:56,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:56,614 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2021-11-20 23:13:56,615 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-20 23:13:56,615 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2021-11-20 23:13:56,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:13:56,616 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:56,616 INFO L514 BasicCegarLoop]: trace histogram [22, 12, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:56,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:13:56,830 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:56,831 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:56,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:56,831 INFO L85 PathProgramCache]: Analyzing trace with hash -1459782650, now seen corresponding path program 5 times [2021-11-20 23:13:56,831 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:56,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760618811] [2021-11-20 23:13:56,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:56,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:56,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:57,160 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-20 23:13:57,160 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:57,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760618811] [2021-11-20 23:13:57,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [760618811] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:13:57,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300838389] [2021-11-20 23:13:57,160 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:13:57,161 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:57,161 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:57,168 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:13:57,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:13:57,224 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:13:57,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:13:57,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 23:13:57,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:13:57,381 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 305 trivial. 0 not checked. [2021-11-20 23:13:57,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:13:57,547 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 305 trivial. 0 not checked. [2021-11-20 23:13:57,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1300838389] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:13:57,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1337964892] [2021-11-20 23:13:57,550 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:13:57,550 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:13:57,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:13:57,551 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:13:57,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:13:57,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:57,587 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:13:57,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:13:57,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:57,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:57,617 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:13:57,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:13:57,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:57,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:13:57,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:57,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:57,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:57,752 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:13:57,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-20 23:13:57,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:13:58,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:58,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:13:58,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:58,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-20 23:13:58,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:58,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:58,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:58,397 INFO L354 Elim1Store]: treesize reduction 65, result has 27.0 percent of original size [2021-11-20 23:13:58,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 62 [2021-11-20 23:13:58,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:13:58,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:13:58,552 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 13 treesize of output 9 [2021-11-20 23:13:59,002 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-20 23:13:59,203 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:13:59,731 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:13:59,732 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:13:59,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 7, 7] total 35 [2021-11-20 23:13:59,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303069057] [2021-11-20 23:13:59,732 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:13:59,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-20 23:13:59,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:59,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-20 23:13:59,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=416, Invalid=1840, Unknown=0, NotChecked=0, Total=2256 [2021-11-20 23:13:59,735 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 2 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:13:59,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:59,822 INFO L93 Difference]: Finished difference Result 69 states and 86 transitions. [2021-11-20 23:13:59,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-20 23:13:59,824 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 2 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 56 [2021-11-20 23:13:59,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:59,825 INFO L225 Difference]: With dead ends: 69 [2021-11-20 23:13:59,825 INFO L226 Difference]: Without dead ends: 50 [2021-11-20 23:13:59,827 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 710 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=416, Invalid=1840, Unknown=0, NotChecked=0, Total=2256 [2021-11-20 23:13:59,827 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:59,828 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 106 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:13:59,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-20 23:13:59,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-20 23:13:59,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 45 states have internal predecessors, (48), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:13:59,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-11-20 23:13:59,834 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 56 [2021-11-20 23:13:59,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:59,835 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-11-20 23:13:59,835 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 2 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:13:59,835 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-11-20 23:13:59,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-20 23:13:59,837 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:59,837 INFO L514 BasicCegarLoop]: trace histogram [30, 23, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:59,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:00,062 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:00,063 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:00,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:00,063 INFO L85 PathProgramCache]: Analyzing trace with hash 619420018, now seen corresponding path program 6 times [2021-11-20 23:14:00,063 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:00,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [484487744] [2021-11-20 23:14:00,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:00,063 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:00,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:00,522 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-20 23:14:00,522 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:00,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [484487744] [2021-11-20 23:14:00,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [484487744] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:00,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900096749] [2021-11-20 23:14:00,523 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:14:00,523 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:00,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:00,524 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:00,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:14:00,621 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:14:00,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:14:00,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-20 23:14:00,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:00,763 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-20 23:14:00,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:14:01,477 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-20 23:14:01,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900096749] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:14:01,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [477986898] [2021-11-20 23:14:01,479 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:14:01,480 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:14:01,480 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:14:01,480 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:14:01,480 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:14:01,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:01,503 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:14:01,504 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:14:01,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:01,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:01,536 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:14:01,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:14:01,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:01,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:14:01,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:01,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:01,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:01,684 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:14:01,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-20 23:14:01,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:14:02,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:02,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:14:02,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:02,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-20 23:14:02,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:02,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:02,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:02,368 INFO L354 Elim1Store]: treesize reduction 60, result has 32.6 percent of original size [2021-11-20 23:14:02,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 67 [2021-11-20 23:14:02,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:02,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:14:02,479 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 13 treesize of output 9 [2021-11-20 23:14:02,831 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-20 23:14:03,070 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:14:03,638 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:14:03,638 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:14:03,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 26] total 51 [2021-11-20 23:14:03,638 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326579019] [2021-11-20 23:14:03,639 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:14:03,639 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-20 23:14:03,639 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:03,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-20 23:14:03,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=2706, Unknown=0, NotChecked=0, Total=4032 [2021-11-20 23:14:03,642 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 51 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 51 states have internal predecessors, (65), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-20 23:14:03,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:03,735 INFO L93 Difference]: Finished difference Result 100 states and 132 transitions. [2021-11-20 23:14:03,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-20 23:14:03,736 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 51 states have internal predecessors, (65), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 75 [2021-11-20 23:14:03,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:03,737 INFO L225 Difference]: With dead ends: 100 [2021-11-20 23:14:03,737 INFO L226 Difference]: Without dead ends: 75 [2021-11-20 23:14:03,739 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 187 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1063 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1326, Invalid=2706, Unknown=0, NotChecked=0, Total=4032 [2021-11-20 23:14:03,740 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:03,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 84 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:14:03,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-20 23:14:03,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-20 23:14:03,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:14:03,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2021-11-20 23:14:03,748 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 75 [2021-11-20 23:14:03,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:03,748 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2021-11-20 23:14:03,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 51 states have internal predecessors, (65), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-20 23:14:03,749 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2021-11-20 23:14:03,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-20 23:14:03,751 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:03,751 INFO L514 BasicCegarLoop]: trace histogram [48, 30, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:03,788 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:03,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:03,979 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:03,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:03,979 INFO L85 PathProgramCache]: Analyzing trace with hash 1893724102, now seen corresponding path program 7 times [2021-11-20 23:14:03,979 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:03,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623869529] [2021-11-20 23:14:03,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:03,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:04,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:05,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1713 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-20 23:14:05,145 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:05,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623869529] [2021-11-20 23:14:05,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [623869529] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:05,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96540560] [2021-11-20 23:14:05,145 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:14:05,146 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:05,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:05,147 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:05,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:14:05,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:05,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-20 23:14:05,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:05,500 INFO L134 CoverageAnalysis]: Checked inductivity of 1713 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-20 23:14:05,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:14:06,163 INFO L134 CoverageAnalysis]: Checked inductivity of 1713 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-11-20 23:14:06,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96540560] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:14:06,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1998125262] [2021-11-20 23:14:06,166 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:14:06,166 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:14:06,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:14:06,166 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:14:06,166 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:14:06,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:06,189 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:14:06,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:14:06,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:06,211 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:14:06,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:14:06,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:06,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:14:06,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:06,361 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:14:06,383 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:14:06,384 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 186 treesize of output 185 [2021-11-20 23:14:06,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:14:06,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:06,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:14:07,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:07,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:07,060 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:14:07,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-20 23:14:07,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:07,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:07,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:07,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:07,154 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-20 23:14:07,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-20 23:14:07,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:07,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:14:07,248 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 13 treesize of output 9 [2021-11-20 23:14:07,609 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-20 23:14:07,878 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:14:08,688 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:14:08,688 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:14:08,688 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 51] total 63 [2021-11-20 23:14:08,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318146159] [2021-11-20 23:14:08,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:14:08,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-20 23:14:08,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:08,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-20 23:14:08,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2004, Invalid=3696, Unknown=0, NotChecked=0, Total=5700 [2021-11-20 23:14:08,693 INFO L87 Difference]: Start difference. First operand 75 states and 79 transitions. Second operand has 63 states, 63 states have (on average 1.2380952380952381) internal successors, (78), 63 states have internal predecessors, (78), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-20 23:14:08,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:08,782 INFO L93 Difference]: Finished difference Result 112 states and 131 transitions. [2021-11-20 23:14:08,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-20 23:14:08,783 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.2380952380952381) internal successors, (78), 63 states have internal predecessors, (78), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 100 [2021-11-20 23:14:08,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:08,784 INFO L225 Difference]: With dead ends: 112 [2021-11-20 23:14:08,784 INFO L226 Difference]: Without dead ends: 87 [2021-11-20 23:14:08,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 274 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1087 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2004, Invalid=3696, Unknown=0, NotChecked=0, Total=5700 [2021-11-20 23:14:08,788 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:08,788 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:14:08,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-20 23:14:08,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-11-20 23:14:08,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:14:08,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 91 transitions. [2021-11-20 23:14:08,797 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 91 transitions. Word has length 100 [2021-11-20 23:14:08,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:08,797 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 91 transitions. [2021-11-20 23:14:08,797 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.2380952380952381) internal successors, (78), 63 states have internal predecessors, (78), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-20 23:14:08,798 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 91 transitions. [2021-11-20 23:14:08,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-20 23:14:08,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:08,800 INFO L514 BasicCegarLoop]: trace histogram [60, 30, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:08,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:09,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-20 23:14:09,023 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:09,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:09,023 INFO L85 PathProgramCache]: Analyzing trace with hash 393932998, now seen corresponding path program 8 times [2021-11-20 23:14:09,023 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:09,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133050002] [2021-11-20 23:14:09,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:09,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:09,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:09,246 INFO L134 CoverageAnalysis]: Checked inductivity of 2367 backedges. 0 proven. 299 refuted. 0 times theorem prover too weak. 2068 trivial. 0 not checked. [2021-11-20 23:14:09,246 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:09,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133050002] [2021-11-20 23:14:09,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2133050002] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:09,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338918517] [2021-11-20 23:14:09,246 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:14:09,247 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:09,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:09,251 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:09,251 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:14:09,316 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:14:09,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:14:09,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:14:09,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:09,476 INFO L134 CoverageAnalysis]: Checked inductivity of 2367 backedges. 246 proven. 3 refuted. 0 times theorem prover too weak. 2118 trivial. 0 not checked. [2021-11-20 23:14:09,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:14:09,660 INFO L134 CoverageAnalysis]: Checked inductivity of 2367 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2364 trivial. 0 not checked. [2021-11-20 23:14:09,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338918517] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:14:09,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1002801525] [2021-11-20 23:14:09,662 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:14:09,662 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:14:09,662 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:14:09,662 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:14:09,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:14:09,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:09,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:09,685 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:14:09,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:14:09,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:09,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-20 23:14:09,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:09,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:14:09,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:09,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:09,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:09,817 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:14:09,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-20 23:14:09,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:14:10,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:10,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:14:10,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:10,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:10,372 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:14:10,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-20 23:14:10,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:10,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:10,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:10,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:10,450 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-20 23:14:10,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-20 23:14:10,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:10,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:14:10,580 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 13 treesize of output 9 [2021-11-20 23:14:10,920 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-20 23:14:11,146 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:14:11,577 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:14:11,577 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:14:11,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 5, 5] total 19 [2021-11-20 23:14:11,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979600368] [2021-11-20 23:14:11,578 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:14:11,578 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-20 23:14:11,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:11,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-20 23:14:11,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=836, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:14:11,580 INFO L87 Difference]: Start difference. First operand 87 states and 91 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:14:11,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:11,639 INFO L93 Difference]: Finished difference Result 116 states and 130 transitions. [2021-11-20 23:14:11,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-20 23:14:11,639 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 112 [2021-11-20 23:14:11,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:11,641 INFO L225 Difference]: With dead ends: 116 [2021-11-20 23:14:11,641 INFO L226 Difference]: Without dead ends: 92 [2021-11-20 23:14:11,642 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 317 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=156, Invalid=836, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:14:11,643 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:11,643 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 89 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:14:11,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-20 23:14:11,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-11-20 23:14:11,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 87 states have (on average 1.0344827586206897) internal successors, (90), 87 states have internal predecessors, (90), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:14:11,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 96 transitions. [2021-11-20 23:14:11,652 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 96 transitions. Word has length 112 [2021-11-20 23:14:11,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:11,652 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 96 transitions. [2021-11-20 23:14:11,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:14:11,653 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 96 transitions. [2021-11-20 23:14:11,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-20 23:14:11,655 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:11,655 INFO L514 BasicCegarLoop]: trace histogram [60, 33, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:11,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:11,878 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:11,879 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:11,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:11,879 INFO L85 PathProgramCache]: Analyzing trace with hash -1383726976, now seen corresponding path program 9 times [2021-11-20 23:14:11,879 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:11,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147044529] [2021-11-20 23:14:11,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:11,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:11,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:12,093 INFO L134 CoverageAnalysis]: Checked inductivity of 2487 backedges. 0 proven. 356 refuted. 0 times theorem prover too weak. 2131 trivial. 0 not checked. [2021-11-20 23:14:12,094 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:12,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [147044529] [2021-11-20 23:14:12,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [147044529] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:12,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1936984079] [2021-11-20 23:14:12,095 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:14:12,095 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:12,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:12,098 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:12,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:14:12,256 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:14:12,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:14:12,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 628 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-20 23:14:12,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:12,447 INFO L134 CoverageAnalysis]: Checked inductivity of 2487 backedges. 290 proven. 66 refuted. 0 times theorem prover too weak. 2131 trivial. 0 not checked. [2021-11-20 23:14:12,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:14:12,795 INFO L134 CoverageAnalysis]: Checked inductivity of 2487 backedges. 0 proven. 356 refuted. 0 times theorem prover too weak. 2131 trivial. 0 not checked. [2021-11-20 23:14:12,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1936984079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:14:12,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1937667399] [2021-11-20 23:14:12,797 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:14:12,797 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:14:12,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:14:12,798 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:14:12,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:14:12,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:12,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:12,829 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:14:12,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:14:12,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:12,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-20 23:14:12,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:12,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:14:12,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:12,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:12,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:12,988 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:14:12,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-20 23:14:13,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:14:13,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:13,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:14:13,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:13,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:13,497 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:14:13,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-20 23:14:13,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:13,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:13,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:13,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:13,554 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-20 23:14:13,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-20 23:14:13,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:13,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:14:13,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:14:14,043 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-20 23:14:14,311 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:14:14,878 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:14:14,878 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:14:14,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2021-11-20 23:14:14,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305956418] [2021-11-20 23:14:14,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:14:14,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-20 23:14:14,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:14,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-20 23:14:14,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=1157, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:14:14,881 INFO L87 Difference]: Start difference. First operand 92 states and 96 transitions. Second operand has 27 states, 27 states have (on average 1.6296296296296295) internal successors, (44), 27 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 23:14:14,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:14,942 INFO L93 Difference]: Finished difference Result 134 states and 156 transitions. [2021-11-20 23:14:14,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-20 23:14:14,942 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.6296296296296295) internal successors, (44), 27 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 119 [2021-11-20 23:14:14,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:14,944 INFO L225 Difference]: With dead ends: 134 [2021-11-20 23:14:14,944 INFO L226 Difference]: Without dead ends: 105 [2021-11-20 23:14:14,945 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=403, Invalid=1157, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:14:14,946 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:14,946 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 67 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:14:14,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-20 23:14:14,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2021-11-20 23:14:14,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.03) internal successors, (103), 100 states have internal predecessors, (103), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:14:14,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 109 transitions. [2021-11-20 23:14:14,955 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 109 transitions. Word has length 119 [2021-11-20 23:14:14,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:14,955 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 109 transitions. [2021-11-20 23:14:14,956 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.6296296296296295) internal successors, (44), 27 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 23:14:14,956 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 109 transitions. [2021-11-20 23:14:14,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-20 23:14:14,958 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:14,958 INFO L514 BasicCegarLoop]: trace histogram [72, 60, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:14,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:15,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 23:14:15,187 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:15,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:15,187 INFO L85 PathProgramCache]: Analyzing trace with hash 1657193606, now seen corresponding path program 10 times [2021-11-20 23:14:15,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:15,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636712222] [2021-11-20 23:14:15,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:15,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:15,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:15,629 INFO L134 CoverageAnalysis]: Checked inductivity of 4632 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 3080 trivial. 0 not checked. [2021-11-20 23:14:15,629 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:15,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636712222] [2021-11-20 23:14:15,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1636712222] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:15,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893413634] [2021-11-20 23:14:15,629 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:14:15,629 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:15,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:15,630 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:15,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 23:14:15,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:15,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 784 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:14:15,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:16,076 INFO L134 CoverageAnalysis]: Checked inductivity of 4632 backedges. 1252 proven. 300 refuted. 0 times theorem prover too weak. 3080 trivial. 0 not checked. [2021-11-20 23:14:16,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:14:17,039 INFO L134 CoverageAnalysis]: Checked inductivity of 4632 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 3080 trivial. 0 not checked. [2021-11-20 23:14:17,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893413634] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:14:17,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [356559118] [2021-11-20 23:14:17,041 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:14:17,041 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:14:17,042 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:14:17,042 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:14:17,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:14:17,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,089 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:14:17,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:14:17,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,121 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:14:17,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:14:17,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:14:17,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,253 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:14:17,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-20 23:14:17,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:14:17,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:14:17,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,815 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:14:17,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-20 23:14:17,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,859 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-20 23:14:17,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-20 23:14:17,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:17,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:14:17,962 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 13 treesize of output 9 [2021-11-20 23:14:18,267 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-20 23:14:18,516 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:14:18,997 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:14:18,997 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:14:18,997 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2021-11-20 23:14:18,997 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810457797] [2021-11-20 23:14:18,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:14:18,998 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-20 23:14:18,998 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:18,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-20 23:14:19,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1429, Invalid=2861, Unknown=0, NotChecked=0, Total=4290 [2021-11-20 23:14:19,000 INFO L87 Difference]: Start difference. First operand 105 states and 109 transitions. Second operand has 53 states, 53 states have (on average 1.320754716981132) internal successors, (70), 53 states have internal predecessors, (70), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 23:14:19,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:19,080 INFO L93 Difference]: Finished difference Result 173 states and 208 transitions. [2021-11-20 23:14:19,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-20 23:14:19,080 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.320754716981132) internal successors, (70), 53 states have internal predecessors, (70), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 158 [2021-11-20 23:14:19,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:19,081 INFO L225 Difference]: With dead ends: 173 [2021-11-20 23:14:19,081 INFO L226 Difference]: Without dead ends: 131 [2021-11-20 23:14:19,083 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 435 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1106 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1429, Invalid=2861, Unknown=0, NotChecked=0, Total=4290 [2021-11-20 23:14:19,084 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:19,084 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:14:19,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-20 23:14:19,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2021-11-20 23:14:19,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.0238095238095237) internal successors, (129), 126 states have internal predecessors, (129), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:14:19,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 135 transitions. [2021-11-20 23:14:19,093 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 135 transitions. Word has length 158 [2021-11-20 23:14:19,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:19,093 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 135 transitions. [2021-11-20 23:14:19,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.320754716981132) internal successors, (70), 53 states have internal predecessors, (70), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 23:14:19,093 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 135 transitions. [2021-11-20 23:14:19,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2021-11-20 23:14:19,096 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:19,097 INFO L514 BasicCegarLoop]: trace histogram [150, 60, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:19,125 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:19,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-20 23:14:19,318 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:19,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:19,319 INFO L85 PathProgramCache]: Analyzing trace with hash 864031814, now seen corresponding path program 11 times [2021-11-20 23:14:19,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:19,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318491155] [2021-11-20 23:14:19,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:19,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:19,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:20,580 INFO L134 CoverageAnalysis]: Checked inductivity of 13485 backedges. 0 proven. 6479 refuted. 0 times theorem prover too weak. 7006 trivial. 0 not checked. [2021-11-20 23:14:20,580 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:20,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318491155] [2021-11-20 23:14:20,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1318491155] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:20,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [558045153] [2021-11-20 23:14:20,580 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:14:20,580 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:20,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:20,581 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:20,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-20 23:14:20,822 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 23:14:20,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:14:20,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:14:20,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:21,291 INFO L134 CoverageAnalysis]: Checked inductivity of 13485 backedges. 5206 proven. 21 refuted. 0 times theorem prover too weak. 8258 trivial. 0 not checked. [2021-11-20 23:14:21,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:14:21,779 INFO L134 CoverageAnalysis]: Checked inductivity of 13485 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 13464 trivial. 0 not checked. [2021-11-20 23:14:21,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [558045153] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:14:21,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [456035969] [2021-11-20 23:14:21,781 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:14:21,781 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:14:21,782 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:14:21,782 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:14:21,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:14:21,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:21,804 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:14:21,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:14:21,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:21,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:21,836 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:14:21,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:14:21,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:21,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:14:21,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:21,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:21,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:21,970 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:14:21,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-20 23:14:22,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:14:22,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:22,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:14:22,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:22,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:22,589 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:14:22,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-20 23:14:22,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:22,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:22,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:22,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:22,648 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-20 23:14:22,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-20 23:14:22,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:22,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:14:22,762 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 13 treesize of output 9 [2021-11-20 23:14:23,231 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-20 23:14:23,511 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:14:24,455 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:14:24,456 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:14:24,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 9, 9] total 67 [2021-11-20 23:14:24,456 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797514885] [2021-11-20 23:14:24,456 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:14:24,457 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-20 23:14:24,457 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:24,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-20 23:14:24,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1551, Invalid=4769, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 23:14:24,459 INFO L87 Difference]: Start difference. First operand 131 states and 135 transitions. Second operand has 67 states, 67 states have (on average 1.2686567164179106) internal successors, (85), 67 states have internal predecessors, (85), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:14:24,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:24,540 INFO L93 Difference]: Finished difference Result 208 states and 226 transitions. [2021-11-20 23:14:24,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-20 23:14:24,541 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.2686567164179106) internal successors, (85), 67 states have internal predecessors, (85), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 236 [2021-11-20 23:14:24,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:24,543 INFO L225 Difference]: With dead ends: 208 [2021-11-20 23:14:24,543 INFO L226 Difference]: Without dead ends: 140 [2021-11-20 23:14:24,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 759 GetRequests, 681 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1630 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1551, Invalid=4769, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 23:14:24,573 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:24,574 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:14:24,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-20 23:14:24,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2021-11-20 23:14:24,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 135 states have (on average 1.0222222222222221) internal successors, (138), 135 states have internal predecessors, (138), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:14:24,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 144 transitions. [2021-11-20 23:14:24,591 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 144 transitions. Word has length 236 [2021-11-20 23:14:24,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:24,592 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 144 transitions. [2021-11-20 23:14:24,592 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.2686567164179106) internal successors, (85), 67 states have internal predecessors, (85), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:14:24,592 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 144 transitions. [2021-11-20 23:14:24,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2021-11-20 23:14:24,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:24,596 INFO L514 BasicCegarLoop]: trace histogram [153, 60, 14, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:24,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:24,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:24,819 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:24,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:24,819 INFO L85 PathProgramCache]: Analyzing trace with hash -1563318656, now seen corresponding path program 12 times [2021-11-20 23:14:24,819 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:24,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2137044069] [2021-11-20 23:14:24,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:24,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:24,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:26,253 INFO L134 CoverageAnalysis]: Checked inductivity of 14031 backedges. 0 proven. 6736 refuted. 0 times theorem prover too weak. 7295 trivial. 0 not checked. [2021-11-20 23:14:26,254 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:26,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2137044069] [2021-11-20 23:14:26,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2137044069] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:26,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417044237] [2021-11-20 23:14:26,254 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:14:26,254 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:26,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:26,255 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:26,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-20 23:14:26,496 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:14:26,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:14:26,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 1140 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-20 23:14:26,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:26,911 INFO L134 CoverageAnalysis]: Checked inductivity of 14031 backedges. 5410 proven. 1326 refuted. 0 times theorem prover too weak. 7295 trivial. 0 not checked. [2021-11-20 23:14:26,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:14:27,607 INFO L134 CoverageAnalysis]: Checked inductivity of 14031 backedges. 0 proven. 6736 refuted. 0 times theorem prover too weak. 7295 trivial. 0 not checked. [2021-11-20 23:14:27,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [417044237] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:14:27,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [153234108] [2021-11-20 23:14:27,610 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:14:27,610 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:14:27,610 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:14:27,611 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:14:27,611 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:14:27,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:27,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:27,660 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:14:27,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:14:27,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:27,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-20 23:14:27,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:27,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:14:27,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:27,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:27,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:27,783 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:14:27,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-20 23:14:27,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:14:28,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:28,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:14:28,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:28,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-20 23:14:28,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:28,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:28,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:28,464 INFO L354 Elim1Store]: treesize reduction 60, result has 32.6 percent of original size [2021-11-20 23:14:28,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 67 [2021-11-20 23:14:28,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:28,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:14:28,598 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 13 treesize of output 9 [2021-11-20 23:14:29,074 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-20 23:14:29,368 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:14:30,218 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:14:30,218 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:14:30,218 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 63 [2021-11-20 23:14:30,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439681110] [2021-11-20 23:14:30,219 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:14:30,219 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-20 23:14:30,219 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:30,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-20 23:14:30,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2004, Invalid=3696, Unknown=0, NotChecked=0, Total=5700 [2021-11-20 23:14:30,222 INFO L87 Difference]: Start difference. First operand 140 states and 144 transitions. Second operand has 63 states, 63 states have (on average 1.2857142857142858) internal successors, (81), 63 states have internal predecessors, (81), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 23:14:30,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:30,320 INFO L93 Difference]: Finished difference Result 226 states and 244 transitions. [2021-11-20 23:14:30,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-20 23:14:30,321 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.2857142857142858) internal successors, (81), 63 states have internal predecessors, (81), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 247 [2021-11-20 23:14:30,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:30,322 INFO L225 Difference]: With dead ends: 226 [2021-11-20 23:14:30,323 INFO L226 Difference]: Without dead ends: 149 [2021-11-20 23:14:30,324 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 793 GetRequests, 718 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1045 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2004, Invalid=3696, Unknown=0, NotChecked=0, Total=5700 [2021-11-20 23:14:30,325 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:30,325 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 111 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:14:30,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-20 23:14:30,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2021-11-20 23:14:30,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:14:30,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 153 transitions. [2021-11-20 23:14:30,354 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 153 transitions. Word has length 247 [2021-11-20 23:14:30,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:30,355 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 153 transitions. [2021-11-20 23:14:30,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.2857142857142858) internal successors, (81), 63 states have internal predecessors, (81), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 23:14:30,355 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 153 transitions. [2021-11-20 23:14:30,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2021-11-20 23:14:30,357 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:30,357 INFO L514 BasicCegarLoop]: trace histogram [180, 60, 14, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:30,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:30,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-20 23:14:30,579 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:30,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:30,579 INFO L85 PathProgramCache]: Analyzing trace with hash 282334982, now seen corresponding path program 13 times [2021-11-20 23:14:30,579 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:30,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985567286] [2021-11-20 23:14:30,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:30,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:30,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:31,043 INFO L134 CoverageAnalysis]: Checked inductivity of 18594 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 18489 trivial. 0 not checked. [2021-11-20 23:14:31,044 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:31,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985567286] [2021-11-20 23:14:31,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1985567286] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:31,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2015202164] [2021-11-20 23:14:31,044 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:14:31,045 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:31,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:31,046 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:31,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-20 23:14:31,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:31,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 1248 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 23:14:31,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:14:31,822 INFO L134 CoverageAnalysis]: Checked inductivity of 18594 backedges. 7446 proven. 105 refuted. 0 times theorem prover too weak. 11043 trivial. 0 not checked. [2021-11-20 23:14:31,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:14:32,373 INFO L134 CoverageAnalysis]: Checked inductivity of 18594 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 18489 trivial. 0 not checked. [2021-11-20 23:14:32,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2015202164] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:14:32,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [302968875] [2021-11-20 23:14:32,375 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:14:32,375 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:14:32,375 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:14:32,376 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:14:32,376 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:14:32,402 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:32,410 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:14:32,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:14:32,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:32,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:32,431 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:14:32,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:14:32,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:32,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:14:32,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:32,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:32,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:32,535 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:14:32,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-20 23:14:32,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:14:32,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:32,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:14:33,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:33,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-20 23:14:33,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:33,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:33,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:33,147 INFO L354 Elim1Store]: treesize reduction 60, result has 32.6 percent of original size [2021-11-20 23:14:33,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 67 [2021-11-20 23:14:33,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:14:33,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:14:33,264 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 13 treesize of output 9 [2021-11-20 23:14:33,596 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-20 23:14:33,724 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:14:34,343 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:14:34,343 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:14:34,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2021-11-20 23:14:34,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871180157] [2021-11-20 23:14:34,343 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:14:34,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-20 23:14:34,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:14:34,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-20 23:14:34,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=580, Invalid=1490, Unknown=0, NotChecked=0, Total=2070 [2021-11-20 23:14:34,345 INFO L87 Difference]: Start difference. First operand 149 states and 153 transitions. Second operand has 33 states, 33 states have (on average 1.4242424242424243) internal successors, (47), 33 states have internal predecessors, (47), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-20 23:14:34,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:14:34,390 INFO L93 Difference]: Finished difference Result 233 states and 253 transitions. [2021-11-20 23:14:34,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-20 23:14:34,390 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.4242424242424243) internal successors, (47), 33 states have internal predecessors, (47), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 274 [2021-11-20 23:14:34,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:14:34,392 INFO L225 Difference]: With dead ends: 233 [2021-11-20 23:14:34,392 INFO L226 Difference]: Without dead ends: 165 [2021-11-20 23:14:34,393 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 837 GetRequests, 793 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 680 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=580, Invalid=1490, Unknown=0, NotChecked=0, Total=2070 [2021-11-20 23:14:34,393 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:14:34,393 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 67 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:14:34,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-11-20 23:14:34,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2021-11-20 23:14:34,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 160 states have (on average 1.01875) internal successors, (163), 160 states have internal predecessors, (163), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:14:34,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 169 transitions. [2021-11-20 23:14:34,400 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 169 transitions. Word has length 274 [2021-11-20 23:14:34,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:14:34,400 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 169 transitions. [2021-11-20 23:14:34,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.4242424242424243) internal successors, (47), 33 states have internal predecessors, (47), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-20 23:14:34,401 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 169 transitions. [2021-11-20 23:14:34,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2021-11-20 23:14:34,402 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:14:34,402 INFO L514 BasicCegarLoop]: trace histogram [180, 60, 30, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:14:34,428 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-20 23:14:34,614 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-20 23:14:34,615 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:14:34,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:14:34,615 INFO L85 PathProgramCache]: Analyzing trace with hash -364246778, now seen corresponding path program 14 times [2021-11-20 23:14:34,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:14:34,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646279965] [2021-11-20 23:14:34,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:14:34,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:14:34,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:14:35,336 INFO L134 CoverageAnalysis]: Checked inductivity of 18954 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 18489 trivial. 0 not checked. [2021-11-20 23:14:35,336 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:14:35,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646279965] [2021-11-20 23:14:35,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [646279965] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:14:35,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489149148] [2021-11-20 23:14:35,337 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:14:35,337 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:14:35,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:14:35,338 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:14:35,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-20 23:15:11,844 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-20 23:15:11,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:15:11,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:15:11,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:15:12,305 INFO L134 CoverageAnalysis]: Checked inductivity of 18954 backedges. 7446 proven. 465 refuted. 0 times theorem prover too weak. 11043 trivial. 0 not checked. [2021-11-20 23:15:12,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:15:13,505 INFO L134 CoverageAnalysis]: Checked inductivity of 18954 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 18489 trivial. 0 not checked. [2021-11-20 23:15:13,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489149148] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:15:13,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1718778929] [2021-11-20 23:15:13,507 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:15:13,508 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:15:13,508 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:15:13,508 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:15:13,508 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:15:13,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:15:13,533 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:15:13,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-20 23:15:13,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:15:13,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:15:13,569 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:15:13,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:15:13,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:15:13,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:15:13,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:15:13,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:15:13,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:15:13,698 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:15:13,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 196 treesize of output 184 [2021-11-20 23:15:13,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:15:14,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:15:14,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:15:14,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:15:14,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-20 23:15:14,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:15:14,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:15:14,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:15:14,320 INFO L354 Elim1Store]: treesize reduction 65, result has 27.0 percent of original size [2021-11-20 23:15:14,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 62 [2021-11-20 23:15:14,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:15:14,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:15:14,430 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 13 treesize of output 9 [2021-11-20 23:15:14,771 INFO L197 IcfgInterpreter]: Interpreting procedure max with input of size 15 for LOIs [2021-11-20 23:15:15,044 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:15:15,687 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:15:15,687 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:15:15,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 62 [2021-11-20 23:15:15,688 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105000915] [2021-11-20 23:15:15,688 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:15:15,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-20 23:15:15,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:15:15,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-20 23:15:15,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1943, Invalid=3607, Unknown=0, NotChecked=0, Total=5550 [2021-11-20 23:15:15,690 INFO L87 Difference]: Start difference. First operand 165 states and 169 transitions. Second operand has 62 states, 62 states have (on average 1.2419354838709677) internal successors, (77), 62 states have internal predecessors, (77), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-20 23:15:15,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:15:15,782 INFO L93 Difference]: Finished difference Result 262 states and 295 transitions. [2021-11-20 23:15:15,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-20 23:15:15,783 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.2419354838709677) internal successors, (77), 62 states have internal predecessors, (77), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 290 [2021-11-20 23:15:15,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:15:15,785 INFO L225 Difference]: With dead ends: 262 [2021-11-20 23:15:15,785 INFO L226 Difference]: Without dead ends: 194 [2021-11-20 23:15:15,786 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 901 GetRequests, 827 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1314 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1943, Invalid=3607, Unknown=0, NotChecked=0, Total=5550 [2021-11-20 23:15:15,787 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:15:15,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:15:15,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-11-20 23:15:15,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 194. [2021-11-20 23:15:15,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 189 states have (on average 1.0158730158730158) internal successors, (192), 189 states have internal predecessors, (192), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:15:15,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 198 transitions. [2021-11-20 23:15:15,797 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 198 transitions. Word has length 290 [2021-11-20 23:15:15,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:15:15,798 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 198 transitions. [2021-11-20 23:15:15,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.2419354838709677) internal successors, (77), 62 states have internal predecessors, (77), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-20 23:15:15,798 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 198 transitions. [2021-11-20 23:15:15,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 320 [2021-11-20 23:15:15,824 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:15:15,825 INFO L514 BasicCegarLoop]: trace histogram [180, 60, 59, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:15:15,875 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-20 23:15:16,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f8847bfe-7309-4de3-b727-49495fc51151/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-20 23:15:16,033 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:15:16,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:15:16,035 INFO L85 PathProgramCache]: Analyzing trace with hash -789159112, now seen corresponding path program 15 times [2021-11-20 23:15:16,035 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:15:16,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651634475] [2021-11-20 23:15:16,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:15:16,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms