./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-cav19/array_init_nondet_vars.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/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_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-cav19/array_init_nondet_vars.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/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_ab9206c4-6005-4101-9b85-32fec0b057c6/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 b36a429fc2ac304c1da00c90b438bd7c9bbfb7e9d7c6704fc9e7805ab1ca424f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:10:54,638 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:10:54,640 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:10:54,698 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:10:54,699 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:10:54,700 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:10:54,702 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:10:54,704 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:10:54,706 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:10:54,708 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:10:54,709 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:10:54,711 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:10:54,711 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:10:54,713 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:10:54,714 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:10:54,716 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:10:54,717 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:10:54,718 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:10:54,721 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:10:54,723 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:10:54,726 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:10:54,729 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:10:54,730 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:10:54,731 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:10:54,735 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:10:54,736 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:10:54,736 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:10:54,738 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:10:54,738 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:10:54,740 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:10:54,740 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:10:54,741 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:10:54,742 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:10:54,743 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:10:54,744 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:10:54,745 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:10:54,746 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:10:54,746 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:10:54,747 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:10:54,748 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:10:54,749 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:10:54,750 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:10:54,781 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:10:54,781 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:10:54,782 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:10:54,782 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:10:54,783 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:10:54,783 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:10:54,783 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:10:54,783 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:10:54,784 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:10:54,784 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:10:54,784 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:10:54,784 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:10:54,785 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:10:54,785 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:10:54,785 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:10:54,785 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:10:54,786 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:10:54,786 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:10:54,787 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:10:54,787 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:10:54,787 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:10:54,788 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:10:54,788 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:10:54,788 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:10:54,788 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:10:54,793 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:10:54,795 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:10:54,795 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:10:54,795 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:10:54,796 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:10:54,796 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:10:54,796 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:10:54,797 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:10:54,797 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:10:54,797 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:10:54,798 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:10:54,798 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:10:54,798 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:10:54,798 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:10:54,799 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:10:54,799 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:10:54,799 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_ab9206c4-6005-4101-9b85-32fec0b057c6/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b36a429fc2ac304c1da00c90b438bd7c9bbfb7e9d7c6704fc9e7805ab1ca424f [2021-11-21 00:10:55,100 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:10:55,127 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:10:55,129 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:10:55,130 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:10:55,131 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:10:55,133 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-cav19/array_init_nondet_vars.c [2021-11-21 00:10:55,211 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/data/f71676f3a/0099276343544e71aea67e929b122c0c/FLAG3269e40ee [2021-11-21 00:10:55,667 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:10:55,668 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/sv-benchmarks/c/array-cav19/array_init_nondet_vars.c [2021-11-21 00:10:55,674 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/data/f71676f3a/0099276343544e71aea67e929b122c0c/FLAG3269e40ee [2021-11-21 00:10:55,690 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/data/f71676f3a/0099276343544e71aea67e929b122c0c [2021-11-21 00:10:55,693 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:10:55,694 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:10:55,696 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:10:55,696 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:10:55,699 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:10:55,700 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:10:55" (1/1) ... [2021-11-21 00:10:55,701 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28d1ff33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:10:55, skipping insertion in model container [2021-11-21 00:10:55,702 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:10:55" (1/1) ... [2021-11-21 00:10:55,708 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:10:55,720 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:10:55,903 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_ab9206c4-6005-4101-9b85-32fec0b057c6/sv-benchmarks/c/array-cav19/array_init_nondet_vars.c[413,426] [2021-11-21 00:10:55,920 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:10:55,927 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:10:55,938 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_ab9206c4-6005-4101-9b85-32fec0b057c6/sv-benchmarks/c/array-cav19/array_init_nondet_vars.c[413,426] [2021-11-21 00:10:55,943 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:10:55,956 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:10:55,956 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:10:55 WrapperNode [2021-11-21 00:10:55,956 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:10:55,957 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:10:55,957 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:10:55,958 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:10:55,965 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:10:55" (1/1) ... [2021-11-21 00:10:55,971 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:10:55" (1/1) ... [2021-11-21 00:10:55,989 INFO L137 Inliner]: procedures = 15, calls = 16, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 55 [2021-11-21 00:10:55,989 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:10:55,990 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:10:55,990 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:10:55,990 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:10:55,998 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:10:55" (1/1) ... [2021-11-21 00:10:55,999 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:10:55" (1/1) ... [2021-11-21 00:10:56,000 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:10:55" (1/1) ... [2021-11-21 00:10:56,001 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:10:55" (1/1) ... [2021-11-21 00:10:56,005 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:10:55" (1/1) ... [2021-11-21 00:10:56,009 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:10:55" (1/1) ... [2021-11-21 00:10:56,010 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:10:55" (1/1) ... [2021-11-21 00:10:56,012 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:10:56,013 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:10:56,013 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:10:56,013 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:10:56,014 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:10:55" (1/1) ... [2021-11-21 00:10:56,022 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:10:56,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:10:56,050 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:10:56,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:10:56,088 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:10:56,089 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 00:10:56,089 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 00:10:56,089 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:10:56,089 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 00:10:56,089 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 00:10:56,089 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:10:56,090 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:10:56,090 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 00:10:56,090 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 00:10:56,161 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:10:56,163 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:10:56,337 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:10:56,378 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:10:56,378 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 00:10:56,398 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:10:56 BoogieIcfgContainer [2021-11-21 00:10:56,399 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:10:56,400 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:10:56,400 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:10:56,403 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:10:56,404 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:10:55" (1/3) ... [2021-11-21 00:10:56,404 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ac75249 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:10:56, skipping insertion in model container [2021-11-21 00:10:56,405 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:10:55" (2/3) ... [2021-11-21 00:10:56,405 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ac75249 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:10:56, skipping insertion in model container [2021-11-21 00:10:56,405 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:10:56" (3/3) ... [2021-11-21 00:10:56,406 INFO L111 eAbstractionObserver]: Analyzing ICFG array_init_nondet_vars.c [2021-11-21 00:10:56,411 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:10:56,411 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:10:56,466 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:10:56,474 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:10:56,474 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:10:56,490 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 10 states have (on average 1.4) 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) [2021-11-21 00:10:56,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 00:10:56,495 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:10:56,496 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:10:56,496 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:10:56,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:10:56,502 INFO L85 PathProgramCache]: Analyzing trace with hash 1661147299, now seen corresponding path program 1 times [2021-11-21 00:10:56,511 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:10:56,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112419358] [2021-11-21 00:10:56,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:10:56,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:10:56,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:10:56,698 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 00:10:56,698 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:10:56,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112419358] [2021-11-21 00:10:56,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112419358] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:10:56,699 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:10:56,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:10:56,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703175164] [2021-11-21 00:10:56,702 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:10:56,706 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:10:56,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:10:56,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:10:56,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:10:56,754 INFO L87 Difference]: Start difference. First operand has 16 states, 10 states have (on average 1.4) 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) Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 00:10:56,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:10:56,821 INFO L93 Difference]: Finished difference Result 32 states and 41 transitions. [2021-11-21 00:10:56,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:10:56,829 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2021-11-21 00:10:56,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:10:56,835 INFO L225 Difference]: With dead ends: 32 [2021-11-21 00:10:56,835 INFO L226 Difference]: Without dead ends: 23 [2021-11-21 00:10:56,838 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:10:56,842 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 8 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:10:56,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 25 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:10:56,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-21 00:10:56,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 16. [2021-11-21 00:10:56,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 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) [2021-11-21 00:10:56,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-11-21 00:10:56,886 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 13 [2021-11-21 00:10:56,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:10:56,887 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-11-21 00:10:56,887 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 00:10:56,888 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-11-21 00:10:56,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 00:10:56,889 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:10:56,889 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:10:56,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:10:56,890 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:10:56,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:10:56,891 INFO L85 PathProgramCache]: Analyzing trace with hash -279186300, now seen corresponding path program 1 times [2021-11-21 00:10:56,891 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:10:56,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056252693] [2021-11-21 00:10:56,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:10:56,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:10:56,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:10:57,123 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:10:57,123 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:10:57,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056252693] [2021-11-21 00:10:57,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2056252693] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:10:57,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6964066] [2021-11-21 00:10:57,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:10:57,125 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:10:57,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:10:57,127 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:10:57,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:10:57,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:10:57,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 00:10:57,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:10:57,590 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 29 treesize of output 25 [2021-11-21 00:10:57,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:10:57,809 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:10:57,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:10:57,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:10:57,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:10:58,120 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:10:58,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6964066] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:10:58,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1245222736] [2021-11-21 00:10:58,151 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 00:10:58,151 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:10:58,157 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:10:58,163 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:10:58,163 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:10:58,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:10:58,653 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:10:58,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:10:58,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:10:58,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:10:59,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:10:59,921 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 35 treesize of output 37 [2021-11-21 00:11:02,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:02,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:02,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:02,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:02,415 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:11:02,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:11:02,948 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 20 treesize of output 16 [2021-11-21 00:11:03,542 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:11:03,568 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:11:04,235 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:11:04,235 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:11:04,235 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2021-11-21 00:11:04,236 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506714189] [2021-11-21 00:11:04,236 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:11:04,236 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 00:11:04,237 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:11:04,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 00:11:04,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=666, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:11:04,239 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 12 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-21 00:11:04,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:11:04,466 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2021-11-21 00:11:04,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:11:04,471 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 12 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 18 [2021-11-21 00:11:04,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:11:04,473 INFO L225 Difference]: With dead ends: 37 [2021-11-21 00:11:04,473 INFO L226 Difference]: Without dead ends: 35 [2021-11-21 00:11:04,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=160, Invalid=1030, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 00:11:04,475 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 55 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:11:04,476 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 88 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:11:04,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-21 00:11:04,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 21. [2021-11-21 00:11:04,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:11:04,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-11-21 00:11:04,483 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 18 [2021-11-21 00:11:04,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:11:04,484 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-11-21 00:11:04,484 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 12 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-21 00:11:04,484 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-11-21 00:11:04,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-21 00:11:04,485 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:11:04,485 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:11:04,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:11:04,703 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:11:04,704 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:11:04,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:11:04,704 INFO L85 PathProgramCache]: Analyzing trace with hash 2118100484, now seen corresponding path program 1 times [2021-11-21 00:11:04,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:11:04,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715010552] [2021-11-21 00:11:04,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:04,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:11:04,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:04,804 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 00:11:04,804 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:11:04,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715010552] [2021-11-21 00:11:04,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715010552] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:11:04,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2027589623] [2021-11-21 00:11:04,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:04,807 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:11:04,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:11:04,812 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:11:04,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:11:04,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:04,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:11:04,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:11:04,937 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 00:11:04,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:11:04,985 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 00:11:04,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2027589623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:11:04,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [405521651] [2021-11-21 00:11:04,988 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:11:04,988 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:11:04,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:11:04,989 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:11:04,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:11:05,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:05,349 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:11:05,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:11:05,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:05,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:11:06,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:06,457 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 35 treesize of output 37 [2021-11-21 00:11:08,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:08,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:08,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:08,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:08,781 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:11:08,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:11:09,331 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 20 treesize of output 16 [2021-11-21 00:11:10,707 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:11:10,723 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:11:11,267 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:11:11,268 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:11:11,268 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2021-11-21 00:11:11,268 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950870503] [2021-11-21 00:11:11,268 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:11:11,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 00:11:11,269 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:11:11,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 00:11:11,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=393, Unknown=0, NotChecked=0, Total=462 [2021-11-21 00:11:11,270 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-21 00:11:11,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:11:11,330 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2021-11-21 00:11:11,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:11:11,331 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 21 [2021-11-21 00:11:11,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:11:11,332 INFO L225 Difference]: With dead ends: 40 [2021-11-21 00:11:11,332 INFO L226 Difference]: Without dead ends: 31 [2021-11-21 00:11:11,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-11-21 00:11:11,334 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 12 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:11:11,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 49 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:11:11,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-21 00:11:11,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 19. [2021-11-21 00:11:11,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:11:11,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2021-11-21 00:11:11,341 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 21 [2021-11-21 00:11:11,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:11:11,341 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2021-11-21 00:11:11,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-21 00:11:11,342 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2021-11-21 00:11:11,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 00:11:11,342 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:11:11,343 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:11:11,376 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:11:11,569 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:11:11,569 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:11:11,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:11:11,570 INFO L85 PathProgramCache]: Analyzing trace with hash -1891214013, now seen corresponding path program 2 times [2021-11-21 00:11:11,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:11:11,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588274317] [2021-11-21 00:11:11,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:11,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:11:11,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:11,721 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 00:11:11,721 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:11:11,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588274317] [2021-11-21 00:11:11,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588274317] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:11:11,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [21502799] [2021-11-21 00:11:11,722 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:11:11,722 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:11:11,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:11:11,723 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:11:11,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:11:11,763 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 00:11:11,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:11:11,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-21 00:11:11,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:11:11,861 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 23 treesize of output 19 [2021-11-21 00:11:12,015 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:11:12,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:11:12,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:11:12,119 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:11:12,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:11:17,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [21502799] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:11:17,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1929851046] [2021-11-21 00:11:17,242 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-21 00:11:17,242 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:11:17,243 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:11:17,243 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:11:17,243 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:11:17,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:17,641 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:11:17,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:11:17,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:17,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:11:18,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:18,790 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 35 treesize of output 37 [2021-11-21 00:11:21,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:21,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:21,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:21,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:21,176 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:11:21,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:11:21,612 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 20 treesize of output 16 [2021-11-21 00:11:22,364 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:11:22,383 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:11:23,242 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:11:23,243 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:11:23,243 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-11-21 00:11:23,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462910262] [2021-11-21 00:11:23,243 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:11:23,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 00:11:23,243 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:11:23,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 00:11:23,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=933, Unknown=3, NotChecked=0, Total=1056 [2021-11-21 00:11:23,244 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 15 states have internal predecessors, (22), 5 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (7), 7 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-21 00:11:23,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:11:23,541 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2021-11-21 00:11:23,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 00:11:23,542 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 15 states have internal predecessors, (22), 5 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (7), 7 states have call predecessors, (7), 5 states have call successors, (7) Word has length 23 [2021-11-21 00:11:23,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:11:23,542 INFO L225 Difference]: With dead ends: 31 [2021-11-21 00:11:23,543 INFO L226 Difference]: Without dead ends: 29 [2021-11-21 00:11:23,544 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=213, Invalid=1424, Unknown=3, NotChecked=0, Total=1640 [2021-11-21 00:11:23,545 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 36 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 8 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:11:23,545 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 83 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 157 Invalid, 0 Unknown, 8 Unchecked, 0.1s Time] [2021-11-21 00:11:23,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-21 00:11:23,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 23. [2021-11-21 00:11:23,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:11:23,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2021-11-21 00:11:23,551 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 23 [2021-11-21 00:11:23,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:11:23,552 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2021-11-21 00:11:23,552 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 15 states have internal predecessors, (22), 5 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (7), 7 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-21 00:11:23,552 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2021-11-21 00:11:23,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 00:11:23,553 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:11:23,554 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:11:23,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:11:23,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:11:23,781 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:11:23,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:11:23,782 INFO L85 PathProgramCache]: Analyzing trace with hash 229839077, now seen corresponding path program 2 times [2021-11-21 00:11:23,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:11:23,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770124287] [2021-11-21 00:11:23,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:23,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:11:23,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:23,966 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 00:11:23,966 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:11:23,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770124287] [2021-11-21 00:11:23,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1770124287] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:11:23,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872208843] [2021-11-21 00:11:23,967 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:11:23,967 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:11:23,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:11:23,983 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:11:23,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:11:24,031 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 00:11:24,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:11:24,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-21 00:11:24,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:11:24,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 25 [2021-11-21 00:11:24,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:11:24,376 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 00:11:24,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:11:24,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:11:24,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:11:24,638 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 00:11:24,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872208843] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:11:24,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1683797118] [2021-11-21 00:11:24,642 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:11:24,642 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:11:24,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:11:24,643 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:11:24,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:11:25,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:25,041 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:11:25,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:11:25,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:25,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:11:26,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:26,203 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 31 treesize of output 33 [2021-11-21 00:11:27,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:27,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:27,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:27,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:27,508 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:11:27,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:11:28,151 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 20 treesize of output 16 [2021-11-21 00:11:29,231 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:11:29,248 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:11:29,950 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:11:29,950 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:11:29,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2021-11-21 00:11:29,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874767357] [2021-11-21 00:11:29,950 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:11:29,951 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 00:11:29,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:11:29,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 00:11:29,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-21 00:11:29,952 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 20 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 16 states have internal predecessors, (32), 5 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (7), 7 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-21 00:11:30,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:11:30,370 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2021-11-21 00:11:30,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 00:11:30,371 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 16 states have internal predecessors, (32), 5 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (7), 7 states have call predecessors, (7), 5 states have call successors, (7) Word has length 26 [2021-11-21 00:11:30,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:11:30,372 INFO L225 Difference]: With dead ends: 48 [2021-11-21 00:11:30,372 INFO L226 Difference]: Without dead ends: 46 [2021-11-21 00:11:30,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 55 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 414 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=216, Invalid=1506, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 00:11:30,374 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 60 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:11:30,374 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 127 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:11:30,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-21 00:11:30,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 29. [2021-11-21 00:11:30,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-21 00:11:30,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2021-11-21 00:11:30,383 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 26 [2021-11-21 00:11:30,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:11:30,383 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2021-11-21 00:11:30,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 16 states have internal predecessors, (32), 5 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (7), 7 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-21 00:11:30,384 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2021-11-21 00:11:30,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-21 00:11:30,389 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:11:30,389 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:11:30,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:11:30,609 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:11:30,609 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:11:30,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:11:30,609 INFO L85 PathProgramCache]: Analyzing trace with hash 963584515, now seen corresponding path program 3 times [2021-11-21 00:11:30,609 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:11:30,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632092351] [2021-11-21 00:11:30,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:30,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:11:30,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:30,695 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:11:30,695 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:11:30,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632092351] [2021-11-21 00:11:30,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1632092351] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:11:30,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [174724705] [2021-11-21 00:11:30,696 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:11:30,696 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:11:30,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:11:30,701 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:11:30,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:11:30,753 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:11:30,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:11:30,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:11:30,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:11:30,854 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:11:30,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:11:30,924 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:11:30,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [174724705] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:11:30,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [61604456] [2021-11-21 00:11:30,928 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:11:30,928 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:11:30,929 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:11:30,929 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:11:30,929 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:11:31,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:31,166 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:11:31,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:11:31,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:31,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:31,220 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:11:31,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:11:32,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:32,235 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 35 treesize of output 37 [2021-11-21 00:11:34,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:34,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:34,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:34,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:34,710 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:11:34,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:11:35,190 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 20 treesize of output 16 [2021-11-21 00:11:36,370 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:11:36,384 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:11:36,997 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:11:36,998 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:11:36,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2021-11-21 00:11:36,998 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994771694] [2021-11-21 00:11:36,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:11:36,998 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 00:11:36,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:11:36,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 00:11:36,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=514, Unknown=0, NotChecked=0, Total=600 [2021-11-21 00:11:37,000 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 4 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-21 00:11:37,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:11:37,081 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2021-11-21 00:11:37,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:11:37,082 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 4 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 29 [2021-11-21 00:11:37,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:11:37,083 INFO L225 Difference]: With dead ends: 51 [2021-11-21 00:11:37,083 INFO L226 Difference]: Without dead ends: 39 [2021-11-21 00:11:37,084 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=103, Invalid=599, Unknown=0, NotChecked=0, Total=702 [2021-11-21 00:11:37,085 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 23 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:11:37,085 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 68 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:11:37,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-21 00:11:37,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 26. [2021-11-21 00:11:37,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-21 00:11:37,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-11-21 00:11:37,092 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 29 [2021-11-21 00:11:37,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:11:37,093 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-11-21 00:11:37,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 4 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-21 00:11:37,093 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-11-21 00:11:37,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-21 00:11:37,094 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:11:37,094 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:11:37,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:11:37,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 00:11:37,297 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:11:37,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:11:37,297 INFO L85 PathProgramCache]: Analyzing trace with hash -1882961244, now seen corresponding path program 4 times [2021-11-21 00:11:37,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:11:37,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533504565] [2021-11-21 00:11:37,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:37,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:11:37,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:37,534 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 3 proven. 17 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 00:11:37,534 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:11:37,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533504565] [2021-11-21 00:11:37,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533504565] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:11:37,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138823408] [2021-11-21 00:11:37,535 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:11:37,535 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:11:37,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:11:37,536 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:11:37,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:11:37,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:37,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-21 00:11:37,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:11:37,730 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 23 treesize of output 19 [2021-11-21 00:11:37,877 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:11:37,877 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:11:37,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:11:38,024 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 9 proven. 17 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 00:11:38,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:11:52,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1138823408] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:11:52,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [988866594] [2021-11-21 00:11:52,210 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:11:52,210 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:11:52,210 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:11:52,210 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:11:52,210 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:11:52,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:52,464 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:11:52,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:11:52,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:52,509 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:11:52,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:11:53,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:53,446 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 35 treesize of output 37 [2021-11-21 00:11:55,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:55,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:55,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:55,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:55,357 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:11:55,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:11:55,739 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 20 treesize of output 16 [2021-11-21 00:11:56,801 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:11:56,817 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:11:57,678 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:11:57,678 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:11:57,678 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-11-21 00:11:57,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283171798] [2021-11-21 00:11:57,679 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:11:57,679 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 00:11:57,679 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:11:57,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 00:11:57,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1250, Unknown=7, NotChecked=0, Total=1406 [2021-11-21 00:11:57,680 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 24 states, 22 states have (on average 1.4545454545454546) internal successors, (32), 20 states have internal predecessors, (32), 7 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-21 00:11:58,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:11:58,097 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-11-21 00:11:58,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 00:11:58,098 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.4545454545454546) internal successors, (32), 20 states have internal predecessors, (32), 7 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) Word has length 31 [2021-11-21 00:11:58,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:11:58,099 INFO L225 Difference]: With dead ends: 39 [2021-11-21 00:11:58,099 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 00:11:58,100 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 649 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=282, Invalid=1967, Unknown=7, NotChecked=0, Total=2256 [2021-11-21 00:11:58,101 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 52 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 22 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:11:58,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 112 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 228 Invalid, 0 Unknown, 22 Unchecked, 0.2s Time] [2021-11-21 00:11:58,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 00:11:58,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 31. [2021-11-21 00:11:58,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-21 00:11:58,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-11-21 00:11:58,109 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 31 [2021-11-21 00:11:58,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:11:58,109 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-11-21 00:11:58,109 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 1.4545454545454546) internal successors, (32), 20 states have internal predecessors, (32), 7 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-21 00:11:58,110 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-11-21 00:11:58,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-21 00:11:58,111 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:11:58,111 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:11:58,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:11:58,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:11:58,317 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:11:58,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:11:58,317 INFO L85 PathProgramCache]: Analyzing trace with hash 1274944484, now seen corresponding path program 5 times [2021-11-21 00:11:58,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:11:58,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256453262] [2021-11-21 00:11:58,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:11:58,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:11:58,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:11:58,676 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 00:11:58,676 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:11:58,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256453262] [2021-11-21 00:11:58,677 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256453262] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:11:58,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852293482] [2021-11-21 00:11:58,677 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:11:58,677 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:11:58,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:11:58,678 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:11:58,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:11:58,720 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 00:11:58,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:11:58,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 00:11:58,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:11:58,901 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 39 treesize of output 35 [2021-11-21 00:11:59,144 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-11-21 00:11:59,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 71 treesize of output 50 [2021-11-21 00:11:59,178 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 00:11:59,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:11:59,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 30 [2021-11-21 00:11:59,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 47 [2021-11-21 00:11:59,711 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 7 proven. 18 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 00:11:59,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1852293482] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:11:59,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [534643944] [2021-11-21 00:11:59,713 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:11:59,713 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:11:59,713 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:11:59,713 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:11:59,713 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:11:59,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:11:59,970 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:11:59,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:11:59,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:00,019 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:12:00,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:12:00,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:00,884 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 35 treesize of output 37 [2021-11-21 00:12:03,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:03,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:03,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:03,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:03,013 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:12:03,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:12:03,366 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 20 treesize of output 16 [2021-11-21 00:12:04,405 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:12:04,421 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:12:05,351 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:12:05,351 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:12:05,351 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 33 [2021-11-21 00:12:05,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894581686] [2021-11-21 00:12:05,352 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:12:05,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-21 00:12:05,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:12:05,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-21 00:12:05,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=1774, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 00:12:05,354 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 33 states, 31 states have (on average 1.7096774193548387) internal successors, (53), 27 states have internal predecessors, (53), 11 states have call successors, (12), 1 states have call predecessors, (12), 2 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-21 00:12:06,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:12:06,017 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2021-11-21 00:12:06,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-21 00:12:06,017 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 1.7096774193548387) internal successors, (53), 27 states have internal predecessors, (53), 11 states have call successors, (12), 1 states have call predecessors, (12), 2 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) Word has length 34 [2021-11-21 00:12:06,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:12:06,018 INFO L225 Difference]: With dead ends: 46 [2021-11-21 00:12:06,018 INFO L226 Difference]: Without dead ends: 34 [2021-11-21 00:12:06,020 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1048 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=391, Invalid=3031, Unknown=0, NotChecked=0, Total=3422 [2021-11-21 00:12:06,021 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 16 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:12:06,021 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 119 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 144 Invalid, 0 Unknown, 47 Unchecked, 0.1s Time] [2021-11-21 00:12:06,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-21 00:12:06,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-21 00:12:06,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 00:12:06,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-11-21 00:12:06,030 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 34 [2021-11-21 00:12:06,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:12:06,030 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-11-21 00:12:06,031 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 1.7096774193548387) internal successors, (53), 27 states have internal predecessors, (53), 11 states have call successors, (12), 1 states have call predecessors, (12), 2 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-21 00:12:06,031 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-11-21 00:12:06,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-21 00:12:06,032 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:12:06,033 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:12:06,079 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:12:06,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:12:06,255 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:12:06,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:12:06,256 INFO L85 PathProgramCache]: Analyzing trace with hash 148186787, now seen corresponding path program 6 times [2021-11-21 00:12:06,256 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:12:06,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324154208] [2021-11-21 00:12:06,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:12:06,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:12:06,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:12:06,635 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 4 proven. 33 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 00:12:06,635 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:12:06,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324154208] [2021-11-21 00:12:06,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1324154208] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:12:06,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345677922] [2021-11-21 00:12:06,636 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:12:06,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:12:06,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:12:06,641 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:12:06,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:12:06,700 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:12:06,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:12:06,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-21 00:12:06,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:12:06,969 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 23 treesize of output 19 [2021-11-21 00:12:07,178 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:12:07,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:12:07,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:12:07,381 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 12 proven. 33 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 00:12:07,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:12:09,520 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (<= 5 (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~#a~0#1.base|) (+ |c_ULTIMATE.start_main_~#a~0#1.offset| (* |c_ULTIMATE.start_main_~i~0#1| 4)) (+ |c_ULTIMATE.start_main_~i~0#1| |c_ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ |c_ULTIMATE.start_main_~#a~0#1.offset| 12)))) is different from false [2021-11-21 00:12:09,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345677922] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:12:09,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [829369543] [2021-11-21 00:12:09,532 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:12:09,532 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:12:09,532 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:12:09,533 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:12:09,533 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:12:09,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:09,802 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:12:09,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:12:09,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:09,850 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:12:09,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:12:10,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:10,884 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 31 treesize of output 33 [2021-11-21 00:12:12,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:12,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:12,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:12,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:12,435 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:12:12,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:12:13,164 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 20 treesize of output 16 [2021-11-21 00:12:14,496 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:12:14,517 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:12:15,649 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:12:15,650 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:12:15,650 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 28 [2021-11-21 00:12:15,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164909134] [2021-11-21 00:12:15,650 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:12:15,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-21 00:12:15,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:12:15,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-21 00:12:15,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1720, Unknown=1, NotChecked=84, Total=1980 [2021-11-21 00:12:15,653 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 28 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 24 states have internal predecessors, (43), 10 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-21 00:12:17,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:12:17,411 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2021-11-21 00:12:17,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-21 00:12:17,412 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 24 states have internal predecessors, (43), 10 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) Word has length 39 [2021-11-21 00:12:17,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:12:17,413 INFO L225 Difference]: With dead ends: 74 [2021-11-21 00:12:17,413 INFO L226 Difference]: Without dead ends: 72 [2021-11-21 00:12:17,416 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1602 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=690, Invalid=4863, Unknown=1, NotChecked=146, Total=5700 [2021-11-21 00:12:17,417 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 138 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 422 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 603 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:12:17,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 151 Invalid, 603 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 422 Invalid, 0 Unknown, 29 Unchecked, 0.4s Time] [2021-11-21 00:12:17,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-21 00:12:17,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 40. [2021-11-21 00:12:17,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 29 states have internal predecessors, (30), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-21 00:12:17,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-11-21 00:12:17,429 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 39 [2021-11-21 00:12:17,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:12:17,429 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-11-21 00:12:17,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 24 states have internal predecessors, (43), 10 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-21 00:12:17,430 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-11-21 00:12:17,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-21 00:12:17,432 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:12:17,432 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:12:17,462 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:12:17,645 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:12:17,645 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:12:17,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:12:17,646 INFO L85 PathProgramCache]: Analyzing trace with hash -588297339, now seen corresponding path program 7 times [2021-11-21 00:12:17,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:12:17,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191134498] [2021-11-21 00:12:17,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:12:17,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:12:17,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:12:17,910 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 5 proven. 40 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 00:12:17,911 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:12:17,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191134498] [2021-11-21 00:12:17,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191134498] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:12:17,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840383113] [2021-11-21 00:12:17,911 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:12:17,911 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:12:17,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:12:17,912 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:12:17,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:12:17,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:12:17,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-21 00:12:17,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:12:18,201 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 29 treesize of output 25 [2021-11-21 00:12:18,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:12:18,435 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 5 proven. 40 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 00:12:18,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:12:18,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:12:18,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:12:18,768 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 5 proven. 40 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 00:12:18,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1840383113] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:12:18,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1978540216] [2021-11-21 00:12:18,771 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:12:18,771 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:12:18,771 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:12:18,772 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:12:18,772 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:12:19,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:19,077 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:12:19,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:12:19,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:19,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:12:20,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:20,280 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 35 treesize of output 37 [2021-11-21 00:12:22,390 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:22,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:22,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:22,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:22,400 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:12:22,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:12:22,779 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 20 treesize of output 16 [2021-11-21 00:12:23,973 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:12:23,988 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:12:24,793 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:12:24,793 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:12:24,793 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2021-11-21 00:12:24,793 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618707054] [2021-11-21 00:12:24,793 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:12:24,794 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-21 00:12:24,794 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:12:24,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-21 00:12:24,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1423, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 00:12:24,795 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 28 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 24 states have internal predecessors, (52), 9 states have call successors, (10), 1 states have call predecessors, (10), 2 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2021-11-21 00:12:25,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:12:25,544 INFO L93 Difference]: Finished difference Result 70 states and 76 transitions. [2021-11-21 00:12:25,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 00:12:25,545 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 24 states have internal predecessors, (52), 9 states have call successors, (10), 1 states have call predecessors, (10), 2 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) Word has length 42 [2021-11-21 00:12:25,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:12:25,546 INFO L225 Difference]: With dead ends: 70 [2021-11-21 00:12:25,546 INFO L226 Difference]: Without dead ends: 68 [2021-11-21 00:12:25,547 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 99 SyntacticMatches, 3 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 781 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=316, Invalid=2764, Unknown=0, NotChecked=0, Total=3080 [2021-11-21 00:12:25,548 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 67 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 492 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:12:25,548 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 223 Invalid, 572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 492 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:12:25,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-21 00:12:25,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 45. [2021-11-21 00:12:25,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-21 00:12:25,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2021-11-21 00:12:25,559 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 42 [2021-11-21 00:12:25,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:12:25,559 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2021-11-21 00:12:25,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 24 states have internal predecessors, (52), 9 states have call successors, (10), 1 states have call predecessors, (10), 2 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2021-11-21 00:12:25,560 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2021-11-21 00:12:25,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-21 00:12:25,561 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:12:25,561 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:12:25,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:12:25,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 00:12:25,784 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:12:25,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:12:25,785 INFO L85 PathProgramCache]: Analyzing trace with hash 1801020259, now seen corresponding path program 8 times [2021-11-21 00:12:25,785 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:12:25,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468127142] [2021-11-21 00:12:25,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:12:25,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:12:25,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:12:25,912 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 16 proven. 32 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 00:12:25,912 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:12:25,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468127142] [2021-11-21 00:12:25,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468127142] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:12:25,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1875459733] [2021-11-21 00:12:25,912 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:12:25,913 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:12:25,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:12:25,914 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:12:25,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:12:25,994 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-21 00:12:25,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:12:25,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:12:25,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:12:26,210 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 26 proven. 22 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 00:12:26,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:12:26,328 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 26 proven. 22 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 00:12:26,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1875459733] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:12:26,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2119646326] [2021-11-21 00:12:26,331 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:12:26,331 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:12:26,332 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:12:26,332 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:12:26,332 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:12:26,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:26,581 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:12:26,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:12:26,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:26,629 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:12:26,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:12:27,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:27,606 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 31 treesize of output 33 [2021-11-21 00:12:28,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:28,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:28,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:28,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:28,994 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:12:28,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:12:29,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:12:30,858 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:12:30,878 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:12:31,749 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:12:31,750 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:12:31,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2021-11-21 00:12:31,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758581162] [2021-11-21 00:12:31,750 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:12:31,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 00:12:31,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:12:31,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 00:12:31,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:12:31,752 INFO L87 Difference]: Start difference. First operand 45 states and 50 transitions. Second operand has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 6 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-21 00:12:31,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:12:31,931 INFO L93 Difference]: Finished difference Result 73 states and 79 transitions. [2021-11-21 00:12:31,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 00:12:31,932 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 6 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) Word has length 45 [2021-11-21 00:12:31,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:12:31,933 INFO L225 Difference]: With dead ends: 73 [2021-11-21 00:12:31,933 INFO L226 Difference]: Without dead ends: 55 [2021-11-21 00:12:31,934 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=178, Invalid=1012, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 00:12:31,935 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 39 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:12:31,935 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 99 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:12:31,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-21 00:12:31,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 42. [2021-11-21 00:12:31,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-21 00:12:31,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2021-11-21 00:12:31,947 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 45 [2021-11-21 00:12:31,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:12:31,947 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2021-11-21 00:12:31,948 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 6 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-21 00:12:31,948 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2021-11-21 00:12:31,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-21 00:12:31,949 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:12:31,950 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 5, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:12:31,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:12:32,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:12:32,157 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:12:32,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:12:32,157 INFO L85 PathProgramCache]: Analyzing trace with hash 506144580, now seen corresponding path program 9 times [2021-11-21 00:12:32,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:12:32,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818749501] [2021-11-21 00:12:32,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:12:32,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:12:32,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:12:32,447 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 5 proven. 55 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:12:32,448 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:12:32,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818749501] [2021-11-21 00:12:32,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1818749501] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:12:32,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596557260] [2021-11-21 00:12:32,448 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:12:32,448 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:12:32,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:12:32,449 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:12:32,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:12:32,521 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:12:32,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:12:32,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-21 00:12:32,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:12:32,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:12:32,927 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:12:32,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:12:33,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:12:33,219 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 15 proven. 55 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 00:12:33,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:12:47,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596557260] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:12:47,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [878896924] [2021-11-21 00:12:47,461 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:12:47,461 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:12:47,461 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:12:47,461 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:12:47,462 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:12:47,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:47,763 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:12:47,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:12:47,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:47,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:12:48,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:48,827 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 35 treesize of output 37 [2021-11-21 00:12:50,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:50,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:50,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:50,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:51,001 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:12:51,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:12:51,404 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 20 treesize of output 16 [2021-11-21 00:12:52,617 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:12:52,632 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:12:53,486 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:12:53,486 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:12:53,486 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 31 [2021-11-21 00:12:53,486 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206579584] [2021-11-21 00:12:53,486 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:12:53,486 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-21 00:12:53,487 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:12:53,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-21 00:12:53,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1793, Unknown=5, NotChecked=0, Total=1980 [2021-11-21 00:12:53,488 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 31 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 27 states have internal predecessors, (52), 11 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-21 00:12:54,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:12:54,217 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2021-11-21 00:12:54,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 00:12:54,218 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 27 states have internal predecessors, (52), 11 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) Word has length 47 [2021-11-21 00:12:54,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:12:54,219 INFO L225 Difference]: With dead ends: 55 [2021-11-21 00:12:54,219 INFO L226 Difference]: Without dead ends: 53 [2021-11-21 00:12:54,221 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 961 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=385, Invalid=3032, Unknown=5, NotChecked=0, Total=3422 [2021-11-21 00:12:54,221 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 62 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 553 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 646 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 553 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:12:54,222 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 220 Invalid, 646 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 553 Invalid, 0 Unknown, 18 Unchecked, 0.4s Time] [2021-11-21 00:12:54,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-21 00:12:54,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 47. [2021-11-21 00:12:54,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-21 00:12:54,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2021-11-21 00:12:54,233 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 47 [2021-11-21 00:12:54,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:12:54,233 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2021-11-21 00:12:54,234 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 27 states have internal predecessors, (52), 11 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-21 00:12:54,234 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2021-11-21 00:12:54,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-21 00:12:54,235 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:12:54,236 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:12:54,265 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:12:54,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:12:54,441 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:12:54,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:12:54,442 INFO L85 PathProgramCache]: Analyzing trace with hash -1071482044, now seen corresponding path program 10 times [2021-11-21 00:12:54,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:12:54,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016538301] [2021-11-21 00:12:54,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:12:54,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:12:54,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:12:54,759 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 6 proven. 65 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:12:54,759 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:12:54,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016538301] [2021-11-21 00:12:54,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1016538301] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:12:54,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523188518] [2021-11-21 00:12:54,759 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:12:54,759 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:12:54,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:12:54,761 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:12:54,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:12:54,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:12:54,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-21 00:12:54,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:12:55,265 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 29 treesize of output 25 [2021-11-21 00:12:55,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:12:55,658 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 6 proven. 65 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:12:55,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:12:55,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:12:55,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:12:56,000 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 6 proven. 65 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:12:56,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523188518] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:12:56,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [29861502] [2021-11-21 00:12:56,003 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:12:56,003 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:12:56,003 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:12:56,004 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:12:56,004 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:12:56,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:56,279 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:12:56,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:12:56,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:56,336 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:12:56,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:12:57,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:57,328 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 35 treesize of output 37 [2021-11-21 00:12:59,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:59,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:59,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:59,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:12:59,297 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:12:59,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:12:59,707 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 20 treesize of output 16 [2021-11-21 00:13:00,811 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:13:00,829 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:01,831 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:01,831 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:01,831 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2021-11-21 00:13:01,832 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626278184] [2021-11-21 00:13:01,832 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:01,832 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-21 00:13:01,833 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:01,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-21 00:13:01,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1740, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 00:13:01,834 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand has 32 states, 31 states have (on average 2.0) internal successors, (62), 28 states have internal predecessors, (62), 11 states have call successors, (12), 1 states have call predecessors, (12), 2 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-21 00:13:02,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:02,633 INFO L93 Difference]: Finished difference Result 81 states and 87 transitions. [2021-11-21 00:13:02,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-21 00:13:02,633 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.0) internal successors, (62), 28 states have internal predecessors, (62), 11 states have call successors, (12), 1 states have call predecessors, (12), 2 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) Word has length 50 [2021-11-21 00:13:02,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:02,634 INFO L225 Difference]: With dead ends: 81 [2021-11-21 00:13:02,634 INFO L226 Difference]: Without dead ends: 79 [2021-11-21 00:13:02,635 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 121 SyntacticMatches, 3 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1008 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=366, Invalid=3540, Unknown=0, NotChecked=0, Total=3906 [2021-11-21 00:13:02,636 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 82 mSDsluCounter, 335 mSDsCounter, 0 mSdLazyCounter, 849 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 951 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 849 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:02,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 329 Invalid, 951 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 849 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:13:02,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-21 00:13:02,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 53. [2021-11-21 00:13:02,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 states have internal predecessors, (42), 8 states have call successors, (8), 5 states have call predecessors, (8), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-21 00:13:02,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2021-11-21 00:13:02,645 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 50 [2021-11-21 00:13:02,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:02,646 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2021-11-21 00:13:02,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.0) internal successors, (62), 28 states have internal predecessors, (62), 11 states have call successors, (12), 1 states have call predecessors, (12), 2 states have return successors, (13), 13 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-21 00:13:02,646 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2021-11-21 00:13:02,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-21 00:13:02,647 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:02,647 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:02,670 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:02,849 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 00:13:02,849 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:02,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:02,850 INFO L85 PathProgramCache]: Analyzing trace with hash -319117500, now seen corresponding path program 11 times [2021-11-21 00:13:02,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:02,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673491285] [2021-11-21 00:13:02,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:02,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:02,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:03,004 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 27 proven. 48 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 00:13:03,004 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:03,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1673491285] [2021-11-21 00:13:03,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1673491285] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:03,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1921816680] [2021-11-21 00:13:03,005 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:13:03,005 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:03,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:03,006 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:03,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:13:03,086 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-21 00:13:03,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:03,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 00:13:03,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:03,346 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 40 proven. 35 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 00:13:03,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:03,507 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 40 proven. 35 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 00:13:03,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1921816680] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:03,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [877166226] [2021-11-21 00:13:03,509 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:13:03,509 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:03,510 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:03,510 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:03,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:03,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:03,793 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:03,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:13:03,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:03,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:13:04,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:04,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-21 00:13:06,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:06,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:06,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:06,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:06,384 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:13:06,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:13:07,037 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 20 treesize of output 16 [2021-11-21 00:13:08,313 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:13:08,330 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:09,275 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:09,275 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:09,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2021-11-21 00:13:09,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100745464] [2021-11-21 00:13:09,276 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:09,276 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 00:13:09,276 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:09,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 00:13:09,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=961, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:13:09,277 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand has 22 states, 22 states have (on average 2.590909090909091) internal successors, (57), 22 states have internal predecessors, (57), 7 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-21 00:13:09,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:09,462 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2021-11-21 00:13:09,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 00:13:09,462 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.590909090909091) internal successors, (57), 22 states have internal predecessors, (57), 7 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 53 [2021-11-21 00:13:09,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:09,463 INFO L225 Difference]: With dead ends: 84 [2021-11-21 00:13:09,463 INFO L226 Difference]: Without dead ends: 63 [2021-11-21 00:13:09,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=226, Invalid=1256, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 00:13:09,465 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 56 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:09,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 95 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:09,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-21 00:13:09,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 50. [2021-11-21 00:13:09,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 8 states have call successors, (8), 5 states have call predecessors, (8), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-21 00:13:09,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-11-21 00:13:09,477 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 53 [2021-11-21 00:13:09,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:09,477 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-11-21 00:13:09,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.590909090909091) internal successors, (57), 22 states have internal predecessors, (57), 7 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-21 00:13:09,478 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-11-21 00:13:09,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-21 00:13:09,479 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:09,480 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 6, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:09,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:09,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:09,689 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:09,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:09,689 INFO L85 PathProgramCache]: Analyzing trace with hash -1067309053, now seen corresponding path program 12 times [2021-11-21 00:13:09,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:09,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093837351] [2021-11-21 00:13:09,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:09,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:09,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:10,042 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 6 proven. 83 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-21 00:13:10,042 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:10,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093837351] [2021-11-21 00:13:10,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2093837351] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:10,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [740337727] [2021-11-21 00:13:10,043 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:13:10,043 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:10,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:10,044 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:10,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 00:13:10,101 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:13:10,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:10,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-21 00:13:10,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:10,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:13:10,664 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:13:10,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:13:10,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:13:10,986 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 18 proven. 83 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:13:10,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:13,092 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (<= 7 (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~#a~0#1.base|) (+ |c_ULTIMATE.start_main_~#a~0#1.offset| (* |c_ULTIMATE.start_main_~i~0#1| 4)) (+ |c_ULTIMATE.start_main_~i~0#1| |c_ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ |c_ULTIMATE.start_main_~#a~0#1.offset| 20)))) is different from false [2021-11-21 00:13:13,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [740337727] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:13,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2052283394] [2021-11-21 00:13:13,101 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:13:13,101 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:13,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:13,101 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:13,101 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:13,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:13,344 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:13:13,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:13:13,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:13,390 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:13,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:13:14,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:14,394 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 35 treesize of output 37 [2021-11-21 00:13:16,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:16,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:16,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:16,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:16,295 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:13:16,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:13:16,703 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 20 treesize of output 16 [2021-11-21 00:13:17,821 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:13:17,836 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:18,772 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:18,772 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:13:18,772 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 35 [2021-11-21 00:13:18,772 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976670909] [2021-11-21 00:13:18,773 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:18,773 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-21 00:13:18,773 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:18,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-21 00:13:18,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=2066, Unknown=1, NotChecked=92, Total=2352 [2021-11-21 00:13:18,774 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 35 states, 34 states have (on average 1.8235294117647058) internal successors, (62), 31 states have internal predecessors, (62), 13 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (15), 15 states have call predecessors, (15), 13 states have call successors, (15) [2021-11-21 00:13:19,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:19,456 INFO L93 Difference]: Finished difference Result 63 states and 66 transitions. [2021-11-21 00:13:19,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-21 00:13:19,457 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.8235294117647058) internal successors, (62), 31 states have internal predecessors, (62), 13 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (15), 15 states have call predecessors, (15), 13 states have call successors, (15) Word has length 55 [2021-11-21 00:13:19,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:19,458 INFO L225 Difference]: With dead ends: 63 [2021-11-21 00:13:19,459 INFO L226 Difference]: Without dead ends: 61 [2021-11-21 00:13:19,460 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1108 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=421, Invalid=3614, Unknown=1, NotChecked=124, Total=4160 [2021-11-21 00:13:19,461 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 86 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 647 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 782 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:19,461 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 214 Invalid, 782 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 647 Invalid, 0 Unknown, 43 Unchecked, 0.3s Time] [2021-11-21 00:13:19,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-21 00:13:19,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 55. [2021-11-21 00:13:19,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 40 states have (on average 1.05) internal successors, (42), 40 states have internal predecessors, (42), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-21 00:13:19,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2021-11-21 00:13:19,471 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 55 [2021-11-21 00:13:19,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:19,472 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2021-11-21 00:13:19,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.8235294117647058) internal successors, (62), 31 states have internal predecessors, (62), 13 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (15), 15 states have call predecessors, (15), 13 states have call successors, (15) [2021-11-21 00:13:19,472 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2021-11-21 00:13:19,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-21 00:13:19,473 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:19,474 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:19,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:19,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 00:13:19,692 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:19,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:19,692 INFO L85 PathProgramCache]: Analyzing trace with hash -555594203, now seen corresponding path program 13 times [2021-11-21 00:13:19,692 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:19,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1449045112] [2021-11-21 00:13:19,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:19,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:19,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:19,980 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 7 proven. 96 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-21 00:13:19,980 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:19,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1449045112] [2021-11-21 00:13:19,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1449045112] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:19,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906609347] [2021-11-21 00:13:19,980 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:13:19,980 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:19,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:19,985 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:20,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 00:13:20,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:20,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-21 00:13:20,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:20,405 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 29 treesize of output 25 [2021-11-21 00:13:20,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:13:20,743 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 7 proven. 96 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-21 00:13:20,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:20,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:13:20,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:13:21,098 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 7 proven. 96 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-21 00:13:21,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906609347] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:21,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1083446310] [2021-11-21 00:13:21,100 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:13:21,100 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:21,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:21,101 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:21,101 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:21,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:21,408 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:21,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:13:21,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:21,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:13:22,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:22,366 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 31 treesize of output 33 [2021-11-21 00:13:23,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:23,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:23,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:23,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:23,640 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:13:23,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:13:24,286 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 20 treesize of output 16 [2021-11-21 00:13:25,421 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:13:25,437 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:26,346 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:26,346 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:26,347 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2021-11-21 00:13:26,347 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325936170] [2021-11-21 00:13:26,347 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:26,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-21 00:13:26,348 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:26,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-21 00:13:26,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=2089, Unknown=0, NotChecked=0, Total=2256 [2021-11-21 00:13:26,349 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 36 states, 35 states have (on average 2.057142857142857) internal successors, (72), 32 states have internal predecessors, (72), 13 states have call successors, (14), 1 states have call predecessors, (14), 2 states have return successors, (15), 15 states have call predecessors, (15), 13 states have call successors, (15) [2021-11-21 00:13:27,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:27,236 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2021-11-21 00:13:27,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-21 00:13:27,237 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 2.057142857142857) internal successors, (72), 32 states have internal predecessors, (72), 13 states have call successors, (14), 1 states have call predecessors, (14), 2 states have return successors, (15), 15 states have call predecessors, (15), 13 states have call successors, (15) Word has length 58 [2021-11-21 00:13:27,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:27,238 INFO L225 Difference]: With dead ends: 92 [2021-11-21 00:13:27,238 INFO L226 Difference]: Without dead ends: 90 [2021-11-21 00:13:27,239 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 143 SyntacticMatches, 3 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1264 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=416, Invalid=4414, Unknown=0, NotChecked=0, Total=4830 [2021-11-21 00:13:27,240 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 95 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 820 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 947 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:27,240 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 289 Invalid, 947 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 820 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:13:27,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-21 00:13:27,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 61. [2021-11-21 00:13:27,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 45 states have internal predecessors, (48), 9 states have call successors, (9), 6 states have call predecessors, (9), 6 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-21 00:13:27,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2021-11-21 00:13:27,253 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 58 [2021-11-21 00:13:27,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:27,253 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2021-11-21 00:13:27,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 2.057142857142857) internal successors, (72), 32 states have internal predecessors, (72), 13 states have call successors, (14), 1 states have call predecessors, (14), 2 states have return successors, (15), 15 states have call predecessors, (15), 13 states have call successors, (15) [2021-11-21 00:13:27,254 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2021-11-21 00:13:27,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-21 00:13:27,254 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:27,255 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:27,276 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:27,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 00:13:27,457 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:27,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:27,457 INFO L85 PathProgramCache]: Analyzing trace with hash 1102568643, now seen corresponding path program 14 times [2021-11-21 00:13:27,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:27,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44344237] [2021-11-21 00:13:27,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:27,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:27,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:27,594 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 41 proven. 67 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 00:13:27,594 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:27,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44344237] [2021-11-21 00:13:27,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [44344237] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:27,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1633716659] [2021-11-21 00:13:27,594 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:13:27,595 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:27,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:27,595 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:27,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 00:13:27,690 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-21 00:13:27,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:27,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 00:13:27,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:27,933 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 57 proven. 51 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 00:13:27,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:28,066 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 57 proven. 51 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 00:13:28,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1633716659] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:28,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1899479854] [2021-11-21 00:13:28,067 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:13:28,067 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:28,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:28,068 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:28,068 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:28,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:28,312 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:28,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:13:28,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:28,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:13:29,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:29,281 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 35 treesize of output 37 [2021-11-21 00:13:31,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:31,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:31,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:31,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:31,176 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:13:31,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:13:31,581 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 20 treesize of output 16 [2021-11-21 00:13:32,673 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:13:32,691 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:33,415 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:33,415 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:33,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2021-11-21 00:13:33,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136400999] [2021-11-21 00:13:33,415 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:33,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 00:13:33,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:33,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 00:13:33,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1138, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 00:13:33,417 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 8 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-21 00:13:33,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:33,622 INFO L93 Difference]: Finished difference Result 95 states and 101 transitions. [2021-11-21 00:13:33,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 00:13:33,622 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 8 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 61 [2021-11-21 00:13:33,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:33,623 INFO L225 Difference]: With dead ends: 95 [2021-11-21 00:13:33,623 INFO L226 Difference]: Without dead ends: 71 [2021-11-21 00:13:33,625 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 578 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=281, Invalid=1525, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 00:13:33,626 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 49 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:33,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 105 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:33,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-21 00:13:33,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 58. [2021-11-21 00:13:33,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 9 states have call successors, (9), 6 states have call predecessors, (9), 6 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-21 00:13:33,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2021-11-21 00:13:33,646 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 61 [2021-11-21 00:13:33,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:33,646 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2021-11-21 00:13:33,647 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.6) internal successors, (65), 25 states have internal predecessors, (65), 8 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-21 00:13:33,647 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2021-11-21 00:13:33,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-21 00:13:33,648 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:33,648 INFO L514 BasicCegarLoop]: trace histogram [9, 7, 7, 7, 7, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:33,685 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:33,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 00:13:33,865 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:33,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:33,865 INFO L85 PathProgramCache]: Analyzing trace with hash -909849628, now seen corresponding path program 15 times [2021-11-21 00:13:33,865 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:33,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971434815] [2021-11-21 00:13:33,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:33,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:33,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:34,210 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 7 proven. 117 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 00:13:34,210 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:34,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971434815] [2021-11-21 00:13:34,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971434815] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:34,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1224480390] [2021-11-21 00:13:34,211 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:13:34,211 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:34,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:34,211 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:34,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 00:13:34,263 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:13:34,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:34,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-21 00:13:34,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:34,648 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 23 treesize of output 19 [2021-11-21 00:13:34,817 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:13:34,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:13:35,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:13:35,154 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-21 00:13:35,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:43,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1224480390] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:43,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1886853293] [2021-11-21 00:13:43,428 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:13:43,428 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:43,428 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:43,428 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:43,428 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:43,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:43,669 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:13:43,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:13:43,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:43,723 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:43,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:13:44,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:44,623 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 31 treesize of output 33 [2021-11-21 00:13:46,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:46,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:46,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:46,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:46,074 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:13:46,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:13:46,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:13:47,958 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:13:47,979 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:49,081 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:49,081 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:13:49,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 39 [2021-11-21 00:13:49,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898579875] [2021-11-21 00:13:49,081 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:49,082 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-21 00:13:49,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:49,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-21 00:13:49,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=2532, Unknown=4, NotChecked=0, Total=2756 [2021-11-21 00:13:49,084 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand has 39 states, 38 states have (on average 1.894736842105263) internal successors, (72), 35 states have internal predecessors, (72), 15 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (17), 17 states have call predecessors, (17), 15 states have call successors, (17) [2021-11-21 00:13:50,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:50,576 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2021-11-21 00:13:50,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-21 00:13:50,577 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.894736842105263) internal successors, (72), 35 states have internal predecessors, (72), 15 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (17), 17 states have call predecessors, (17), 15 states have call successors, (17) Word has length 63 [2021-11-21 00:13:50,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:50,578 INFO L225 Difference]: With dead ends: 92 [2021-11-21 00:13:50,578 INFO L226 Difference]: Without dead ends: 90 [2021-11-21 00:13:50,579 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2021 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=716, Invalid=6252, Unknown=4, NotChecked=0, Total=6972 [2021-11-21 00:13:50,579 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 110 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 842 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 1042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 842 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:50,580 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 271 Invalid, 1042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 842 Invalid, 0 Unknown, 55 Unchecked, 0.5s Time] [2021-11-21 00:13:50,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-21 00:13:50,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 64. [2021-11-21 00:13:50,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 47 states have internal predecessors, (48), 10 states have call successors, (10), 7 states have call predecessors, (10), 7 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-21 00:13:50,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2021-11-21 00:13:50,596 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 63 [2021-11-21 00:13:50,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:50,596 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2021-11-21 00:13:50,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.894736842105263) internal successors, (72), 35 states have internal predecessors, (72), 15 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (17), 17 states have call predecessors, (17), 15 states have call successors, (17) [2021-11-21 00:13:50,597 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2021-11-21 00:13:50,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-21 00:13:50,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:50,598 INFO L514 BasicCegarLoop]: trace histogram [9, 7, 7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:50,624 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:50,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 00:13:50,798 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:13:50,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:50,799 INFO L85 PathProgramCache]: Analyzing trace with hash 213848740, now seen corresponding path program 16 times [2021-11-21 00:13:50,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:50,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479246376] [2021-11-21 00:13:50,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:50,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:50,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:51,203 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 8 proven. 133 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 00:13:51,203 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:51,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479246376] [2021-11-21 00:13:51,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479246376] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:51,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [85024724] [2021-11-21 00:13:51,203 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:13:51,203 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:51,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:51,205 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:51,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 00:13:51,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:51,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-21 00:13:51,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:51,775 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 29 treesize of output 25 [2021-11-21 00:13:52,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:13:52,271 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 8 proven. 133 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 00:13:52,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:52,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:13:52,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:13:52,663 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 8 proven. 133 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 00:13:52,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [85024724] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:52,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1961039626] [2021-11-21 00:13:52,665 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:13:52,665 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:52,666 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:52,666 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:52,666 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:52,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:52,960 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:13:52,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:13:52,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:53,030 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:13:53,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:13:54,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:54,104 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 31 treesize of output 33 [2021-11-21 00:13:55,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:55,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:55,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:55,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:55,726 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:13:55,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:13:56,451 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 20 treesize of output 16 [2021-11-21 00:13:57,698 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:13:57,717 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:58,884 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:58,884 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:58,884 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2021-11-21 00:13:58,885 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262073414] [2021-11-21 00:13:58,885 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:58,885 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-21 00:13:58,885 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:58,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-21 00:13:58,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=2470, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 00:13:58,887 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand has 40 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 36 states have internal predecessors, (82), 15 states have call successors, (16), 1 states have call predecessors, (16), 2 states have return successors, (17), 17 states have call predecessors, (17), 15 states have call successors, (17) [2021-11-21 00:14:00,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:00,521 INFO L93 Difference]: Finished difference Result 103 states and 109 transitions. [2021-11-21 00:14:00,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-21 00:14:00,522 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 36 states have internal predecessors, (82), 15 states have call successors, (16), 1 states have call predecessors, (16), 2 states have return successors, (17), 17 states have call predecessors, (17), 15 states have call successors, (17) Word has length 66 [2021-11-21 00:14:00,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:00,523 INFO L225 Difference]: With dead ends: 103 [2021-11-21 00:14:00,523 INFO L226 Difference]: Without dead ends: 101 [2021-11-21 00:14:00,525 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 165 SyntacticMatches, 3 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1549 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=466, Invalid=5386, Unknown=0, NotChecked=0, Total=5852 [2021-11-21 00:14:00,526 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 91 mSDsluCounter, 541 mSDsCounter, 0 mSdLazyCounter, 1460 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 534 SdHoareTripleChecker+Invalid, 1593 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 1460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:00,526 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 534 Invalid, 1593 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 1460 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-21 00:14:00,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-21 00:14:00,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 69. [2021-11-21 00:14:00,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 51 states have (on average 1.0588235294117647) internal successors, (54), 51 states have internal predecessors, (54), 10 states have call successors, (10), 7 states have call predecessors, (10), 7 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-21 00:14:00,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 74 transitions. [2021-11-21 00:14:00,542 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 74 transitions. Word has length 66 [2021-11-21 00:14:00,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:00,543 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 74 transitions. [2021-11-21 00:14:00,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 36 states have internal predecessors, (82), 15 states have call successors, (16), 1 states have call predecessors, (16), 2 states have return successors, (17), 17 states have call predecessors, (17), 15 states have call successors, (17) [2021-11-21 00:14:00,544 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 74 transitions. [2021-11-21 00:14:00,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-21 00:14:00,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:00,545 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:00,571 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-21 00:14:00,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:00,749 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:14:00,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:00,750 INFO L85 PathProgramCache]: Analyzing trace with hash 1336824804, now seen corresponding path program 17 times [2021-11-21 00:14:00,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:00,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935760756] [2021-11-21 00:14:00,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:00,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:00,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:00,948 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 58 proven. 89 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-21 00:14:00,948 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:00,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935760756] [2021-11-21 00:14:00,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [935760756] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:00,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168677498] [2021-11-21 00:14:00,949 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:14:00,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:00,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:00,950 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:00,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 00:14:01,176 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-21 00:14:01,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:14:01,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-21 00:14:01,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:01,542 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 77 proven. 70 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-21 00:14:01,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:14:01,715 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 77 proven. 70 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-21 00:14:01,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168677498] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:14:01,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1021075369] [2021-11-21 00:14:01,717 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:14:01,717 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:14:01,717 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:14:01,717 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:14:01,718 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:14:01,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:01,977 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:14:01,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:14:02,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:02,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:14:03,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:03,004 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 35 treesize of output 37 [2021-11-21 00:14:05,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:05,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:05,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:05,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:05,234 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:14:05,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:14:05,757 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 20 treesize of output 16 [2021-11-21 00:14:07,140 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:14:07,159 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:08,028 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:08,029 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:14:08,029 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2021-11-21 00:14:08,029 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990591254] [2021-11-21 00:14:08,029 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:08,030 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-21 00:14:08,030 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:08,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-21 00:14:08,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1329, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 00:14:08,031 INFO L87 Difference]: Start difference. First operand 69 states and 74 transitions. Second operand has 28 states, 28 states have (on average 2.607142857142857) internal successors, (73), 28 states have internal predecessors, (73), 9 states have call successors, (10), 1 states have call predecessors, (10), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-21 00:14:08,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:08,304 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2021-11-21 00:14:08,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 00:14:08,304 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.607142857142857) internal successors, (73), 28 states have internal predecessors, (73), 9 states have call successors, (10), 1 states have call predecessors, (10), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 69 [2021-11-21 00:14:08,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:08,305 INFO L225 Difference]: With dead ends: 106 [2021-11-21 00:14:08,305 INFO L226 Difference]: Without dead ends: 79 [2021-11-21 00:14:08,306 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 689 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=343, Invalid=1819, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 00:14:08,307 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 78 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:08,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 144 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:14:08,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-21 00:14:08,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 66. [2021-11-21 00:14:08,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 48 states have internal predecessors, (50), 10 states have call successors, (10), 7 states have call predecessors, (10), 7 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-21 00:14:08,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2021-11-21 00:14:08,322 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 69 [2021-11-21 00:14:08,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:08,323 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2021-11-21 00:14:08,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.607142857142857) internal successors, (73), 28 states have internal predecessors, (73), 9 states have call successors, (10), 1 states have call predecessors, (10), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-21 00:14:08,323 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2021-11-21 00:14:08,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-21 00:14:08,324 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:08,324 INFO L514 BasicCegarLoop]: trace histogram [10, 8, 8, 8, 8, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:08,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-21 00:14:08,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2021-11-21 00:14:08,529 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:14:08,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:08,530 INFO L85 PathProgramCache]: Analyzing trace with hash -18652829, now seen corresponding path program 18 times [2021-11-21 00:14:08,530 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:08,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499517912] [2021-11-21 00:14:08,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:08,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:08,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:08,983 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 8 proven. 157 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-21 00:14:08,984 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:08,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499517912] [2021-11-21 00:14:08,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499517912] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:08,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [832016208] [2021-11-21 00:14:08,984 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:14:08,984 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:08,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:08,985 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:08,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 00:14:09,062 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:14:09,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:14:09,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-21 00:14:09,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:09,582 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 23 treesize of output 19 [2021-11-21 00:14:09,807 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:14:09,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:14:10,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:14:10,220 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 24 proven. 157 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 00:14:10,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:14:12,349 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (<= 9 (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~#a~0#1.base|) (+ |c_ULTIMATE.start_main_~#a~0#1.offset| (* |c_ULTIMATE.start_main_~i~0#1| 4)) (+ |c_ULTIMATE.start_main_~i~0#1| |c_ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ |c_ULTIMATE.start_main_~#a~0#1.offset| 28)))) is different from false [2021-11-21 00:14:12,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [832016208] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:12,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [419344896] [2021-11-21 00:14:12,358 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:14:12,358 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:14:12,358 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:14:12,358 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:14:12,358 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:14:12,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:12,664 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:14:12,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:14:12,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:12,730 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:14:12,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:14:13,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:13,764 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 31 treesize of output 33 [2021-11-21 00:14:15,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:15,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:15,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:15,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:15,241 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:14:15,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:14:16,034 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 20 treesize of output 16 [2021-11-21 00:14:17,147 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:14:17,162 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:18,282 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:18,282 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:14:18,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 43 [2021-11-21 00:14:18,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805879013] [2021-11-21 00:14:18,282 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:18,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-21 00:14:18,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:18,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-21 00:14:18,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=2854, Unknown=1, NotChecked=108, Total=3192 [2021-11-21 00:14:18,283 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand has 43 states, 42 states have (on average 1.9523809523809523) internal successors, (82), 39 states have internal predecessors, (82), 17 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (19), 19 states have call predecessors, (19), 17 states have call successors, (19) [2021-11-21 00:14:19,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:19,471 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2021-11-21 00:14:19,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-21 00:14:19,472 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.9523809523809523) internal successors, (82), 39 states have internal predecessors, (82), 17 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (19), 19 states have call predecessors, (19), 17 states have call successors, (19) Word has length 71 [2021-11-21 00:14:19,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:19,474 INFO L225 Difference]: With dead ends: 102 [2021-11-21 00:14:19,474 INFO L226 Difference]: Without dead ends: 100 [2021-11-21 00:14:19,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 138 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1797 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=531, Invalid=5952, Unknown=1, NotChecked=158, Total=6642 [2021-11-21 00:14:19,475 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 96 mSDsluCounter, 506 mSDsCounter, 0 mSdLazyCounter, 1052 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 508 SdHoareTripleChecker+Invalid, 1192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 1052 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:19,476 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 508 Invalid, 1192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 1052 Invalid, 0 Unknown, 60 Unchecked, 0.6s Time] [2021-11-21 00:14:19,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-21 00:14:19,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 74. [2021-11-21 00:14:19,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 11 states have call successors, (11), 8 states have call predecessors, (11), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 00:14:19,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 79 transitions. [2021-11-21 00:14:19,491 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 79 transitions. Word has length 71 [2021-11-21 00:14:19,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:19,492 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 79 transitions. [2021-11-21 00:14:19,492 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 1.9523809523809523) internal successors, (82), 39 states have internal predecessors, (82), 17 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (19), 19 states have call predecessors, (19), 17 states have call successors, (19) [2021-11-21 00:14:19,492 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 79 transitions. [2021-11-21 00:14:19,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-21 00:14:19,493 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:19,493 INFO L514 BasicCegarLoop]: trace histogram [10, 8, 8, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:19,518 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-11-21 00:14:19,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-21 00:14:19,705 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:14:19,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:19,705 INFO L85 PathProgramCache]: Analyzing trace with hash -1630136123, now seen corresponding path program 19 times [2021-11-21 00:14:19,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:19,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798132834] [2021-11-21 00:14:19,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:19,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:19,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:20,248 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 9 proven. 176 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-21 00:14:20,248 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:20,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798132834] [2021-11-21 00:14:20,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1798132834] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:20,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731038342] [2021-11-21 00:14:20,249 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:14:20,249 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:20,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:20,250 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:20,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-21 00:14:20,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:20,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-21 00:14:20,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:20,898 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 29 treesize of output 25 [2021-11-21 00:14:21,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:14:21,457 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 9 proven. 176 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-21 00:14:21,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:14:21,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:14:21,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:14:21,952 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 9 proven. 176 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-21 00:14:21,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731038342] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:14:21,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1214820518] [2021-11-21 00:14:21,954 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:14:21,954 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:14:21,954 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:14:21,955 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:14:21,955 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:14:22,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:22,251 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:14:22,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:14:22,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:22,311 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:14:22,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:14:23,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:23,216 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 35 treesize of output 37 [2021-11-21 00:14:25,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:25,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:25,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:25,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:25,163 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:14:25,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:14:25,594 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 20 treesize of output 16 [2021-11-21 00:14:26,826 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:14:26,843 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:27,915 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:27,916 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:14:27,916 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2021-11-21 00:14:27,916 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536167034] [2021-11-21 00:14:27,916 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:27,916 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-21 00:14:27,916 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:27,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-21 00:14:27,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=2883, Unknown=0, NotChecked=0, Total=3080 [2021-11-21 00:14:27,917 INFO L87 Difference]: Start difference. First operand 74 states and 79 transitions. Second operand has 44 states, 43 states have (on average 2.13953488372093) internal successors, (92), 40 states have internal predecessors, (92), 17 states have call successors, (18), 1 states have call predecessors, (18), 2 states have return successors, (19), 19 states have call predecessors, (19), 17 states have call successors, (19) [2021-11-21 00:14:29,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:29,376 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2021-11-21 00:14:29,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-21 00:14:29,376 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 2.13953488372093) internal successors, (92), 40 states have internal predecessors, (92), 17 states have call successors, (18), 1 states have call predecessors, (18), 2 states have return successors, (19), 19 states have call predecessors, (19), 17 states have call successors, (19) Word has length 74 [2021-11-21 00:14:29,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:29,378 INFO L225 Difference]: With dead ends: 116 [2021-11-21 00:14:29,378 INFO L226 Difference]: Without dead ends: 114 [2021-11-21 00:14:29,379 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 187 SyntacticMatches, 3 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1863 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=516, Invalid=6456, Unknown=0, NotChecked=0, Total=6972 [2021-11-21 00:14:29,380 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 150 mSDsluCounter, 527 mSDsCounter, 0 mSdLazyCounter, 1435 mSolverCounterSat, 208 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 531 SdHoareTripleChecker+Invalid, 1643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 208 IncrementalHoareTripleChecker+Valid, 1435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:29,380 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 531 Invalid, 1643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [208 Valid, 1435 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 00:14:29,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-21 00:14:29,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 77. [2021-11-21 00:14:29,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 57 states have (on average 1.0526315789473684) internal successors, (60), 57 states have internal predecessors, (60), 11 states have call successors, (11), 8 states have call predecessors, (11), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 00:14:29,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2021-11-21 00:14:29,400 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 74 [2021-11-21 00:14:29,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:29,400 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2021-11-21 00:14:29,401 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 2.13953488372093) internal successors, (92), 40 states have internal predecessors, (92), 17 states have call successors, (18), 1 states have call predecessors, (18), 2 states have return successors, (19), 19 states have call predecessors, (19), 17 states have call successors, (19) [2021-11-21 00:14:29,401 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2021-11-21 00:14:29,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-21 00:14:29,402 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:29,402 INFO L514 BasicCegarLoop]: trace histogram [11, 9, 9, 9, 9, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:29,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-21 00:14:29,629 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:29,629 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:14:29,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:29,629 INFO L85 PathProgramCache]: Analyzing trace with hash 590180868, now seen corresponding path program 20 times [2021-11-21 00:14:29,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:29,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674868040] [2021-11-21 00:14:29,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:29,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:29,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:30,109 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 8 proven. 184 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-21 00:14:30,109 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:30,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674868040] [2021-11-21 00:14:30,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674868040] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:30,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1454328639] [2021-11-21 00:14:30,109 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:14:30,110 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:30,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:30,111 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:30,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-21 00:14:30,327 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-21 00:14:30,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:14:30,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-21 00:14:30,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:30,756 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 23 treesize of output 19 [2021-11-21 00:14:30,969 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:14:30,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 42 [2021-11-21 00:14:31,187 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:14:31,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:14:31,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:14:31,639 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 43 proven. 181 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 00:14:31,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:14:41,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1454328639] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:41,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [899514059] [2021-11-21 00:14:41,896 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:14:41,896 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:14:41,896 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:14:41,896 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:14:41,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:14:42,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:42,188 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:14:42,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:14:42,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:42,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:14:43,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:43,281 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 31 treesize of output 33 [2021-11-21 00:14:44,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:44,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:44,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:44,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:44,728 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:14:44,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:14:45,442 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 20 treesize of output 16 [2021-11-21 00:14:46,735 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:14:46,752 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:47,827 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:47,828 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:14:47,828 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 45 [2021-11-21 00:14:47,828 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377257448] [2021-11-21 00:14:47,828 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:47,828 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-21 00:14:47,828 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:47,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-21 00:14:47,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=3159, Unknown=5, NotChecked=0, Total=3422 [2021-11-21 00:14:47,829 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand has 45 states, 44 states have (on average 1.9545454545454546) internal successors, (86), 41 states have internal predecessors, (86), 19 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (21), 21 states have call predecessors, (21), 19 states have call successors, (21) [2021-11-21 00:14:49,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:49,001 INFO L93 Difference]: Finished difference Result 103 states and 107 transitions. [2021-11-21 00:14:49,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-21 00:14:49,002 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 1.9545454545454546) internal successors, (86), 41 states have internal predecessors, (86), 19 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (21), 21 states have call predecessors, (21), 19 states have call successors, (21) Word has length 76 [2021-11-21 00:14:49,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:49,003 INFO L225 Difference]: With dead ends: 103 [2021-11-21 00:14:49,003 INFO L226 Difference]: Without dead ends: 101 [2021-11-21 00:14:49,004 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 139 SyntacticMatches, 5 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1705 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=511, Invalid=5336, Unknown=5, NotChecked=0, Total=5852 [2021-11-21 00:14:49,005 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 79 mSDsluCounter, 559 mSDsCounter, 0 mSdLazyCounter, 1355 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 523 SdHoareTripleChecker+Invalid, 1541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 1355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 54 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:49,005 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 523 Invalid, 1541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 1355 Invalid, 0 Unknown, 54 Unchecked, 0.7s Time] [2021-11-21 00:14:49,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-21 00:14:49,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 79. [2021-11-21 00:14:49,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 00:14:49,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 83 transitions. [2021-11-21 00:14:49,026 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 83 transitions. Word has length 76 [2021-11-21 00:14:49,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:49,027 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 83 transitions. [2021-11-21 00:14:49,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 44 states have (on average 1.9545454545454546) internal successors, (86), 41 states have internal predecessors, (86), 19 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (21), 21 states have call predecessors, (21), 19 states have call successors, (21) [2021-11-21 00:14:49,027 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 83 transitions. [2021-11-21 00:14:49,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-21 00:14:49,028 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:49,029 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:49,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-21 00:14:49,245 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:49,245 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:14:49,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:49,245 INFO L85 PathProgramCache]: Analyzing trace with hash -184512989, now seen corresponding path program 21 times [2021-11-21 00:14:49,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:49,246 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775650300] [2021-11-21 00:14:49,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:49,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:49,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:49,503 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 78 proven. 114 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-21 00:14:49,504 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:49,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775650300] [2021-11-21 00:14:49,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [775650300] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:49,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013917437] [2021-11-21 00:14:49,504 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:14:49,504 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:49,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:49,505 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:49,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-21 00:14:49,576 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:14:49,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:14:49,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-21 00:14:49,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:50,089 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 100 proven. 92 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-21 00:14:50,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:14:50,303 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 100 proven. 92 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-21 00:14:50,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2013917437] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:14:50,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1560859542] [2021-11-21 00:14:50,305 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:14:50,305 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:14:50,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:14:50,306 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:14:50,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:14:50,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:50,575 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:14:50,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:14:50,620 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:50,649 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:14:50,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:14:51,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:51,710 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 35 treesize of output 37 [2021-11-21 00:14:53,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:53,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:53,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:53,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:53,651 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:14:53,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:14:54,039 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 20 treesize of output 16 [2021-11-21 00:14:55,199 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:14:55,217 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:56,094 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:56,094 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:14:56,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2021-11-21 00:14:56,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20896925] [2021-11-21 00:14:56,095 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:56,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-21 00:14:56,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:56,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-21 00:14:56,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=1534, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 00:14:56,096 INFO L87 Difference]: Start difference. First operand 79 states and 83 transitions. Second operand has 31 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 31 states have internal predecessors, (81), 10 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-21 00:14:56,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:56,313 INFO L93 Difference]: Finished difference Result 119 states and 124 transitions. [2021-11-21 00:14:56,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-21 00:14:56,314 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 31 states have internal predecessors, (81), 10 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) Word has length 77 [2021-11-21 00:14:56,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:56,314 INFO L225 Difference]: With dead ends: 119 [2021-11-21 00:14:56,315 INFO L226 Difference]: Without dead ends: 89 [2021-11-21 00:14:56,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 208 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 808 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=412, Invalid=2138, Unknown=0, NotChecked=0, Total=2550 [2021-11-21 00:14:56,316 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 83 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:56,317 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 107 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:14:56,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-21 00:14:56,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 76. [2021-11-21 00:14:56,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 states have internal predecessors, (57), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 00:14:56,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 79 transitions. [2021-11-21 00:14:56,334 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 79 transitions. Word has length 77 [2021-11-21 00:14:56,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:56,334 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 79 transitions. [2021-11-21 00:14:56,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.6129032258064515) internal successors, (81), 31 states have internal predecessors, (81), 10 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-21 00:14:56,335 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 79 transitions. [2021-11-21 00:14:56,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-21 00:14:56,335 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:56,336 INFO L514 BasicCegarLoop]: trace histogram [11, 9, 9, 9, 9, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:14:56,372 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-21 00:14:56,549 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-21 00:14:56,549 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:14:56,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:56,549 INFO L85 PathProgramCache]: Analyzing trace with hash -1512359804, now seen corresponding path program 22 times [2021-11-21 00:14:56,549 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:56,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190715800] [2021-11-21 00:14:56,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:56,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:56,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:57,047 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 9 proven. 203 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-21 00:14:57,047 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:57,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190715800] [2021-11-21 00:14:57,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1190715800] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:57,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [368651339] [2021-11-21 00:14:57,047 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:14:57,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:57,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:57,049 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:57,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-21 00:14:57,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:57,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-21 00:14:57,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:57,843 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 23 treesize of output 19 [2021-11-21 00:14:58,057 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:14:58,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:14:58,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:14:58,609 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 27 proven. 203 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-21 00:14:58,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:15:16,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [368651339] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:15:16,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1395929746] [2021-11-21 00:15:16,935 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:15:16,935 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:15:16,935 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:15:16,936 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:15:16,936 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:15:17,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:17,235 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:15:17,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:15:17,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:17,295 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:15:17,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:15:18,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:18,273 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 35 treesize of output 37 [2021-11-21 00:15:20,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:20,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:20,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:20,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:20,090 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:15:20,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:15:20,486 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 20 treesize of output 16 [2021-11-21 00:15:21,754 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:15:21,774 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:15:23,126 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:15:23,127 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:15:23,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 47 [2021-11-21 00:15:23,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106204279] [2021-11-21 00:15:23,135 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:15:23,135 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-21 00:15:23,135 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:15:23,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-21 00:15:23,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=3395, Unknown=7, NotChecked=0, Total=3660 [2021-11-21 00:15:23,136 INFO L87 Difference]: Start difference. First operand 76 states and 79 transitions. Second operand has 47 states, 46 states have (on average 2.0) internal successors, (92), 43 states have internal predecessors, (92), 19 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (21), 21 states have call predecessors, (21), 19 states have call successors, (21) [2021-11-21 00:15:24,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:15:24,670 INFO L93 Difference]: Finished difference Result 87 states and 90 transitions. [2021-11-21 00:15:24,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-21 00:15:24,671 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 2.0) internal successors, (92), 43 states have internal predecessors, (92), 19 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (21), 21 states have call predecessors, (21), 19 states have call successors, (21) Word has length 79 [2021-11-21 00:15:24,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:15:24,672 INFO L225 Difference]: With dead ends: 87 [2021-11-21 00:15:24,672 INFO L226 Difference]: Without dead ends: 85 [2021-11-21 00:15:24,673 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 159 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1890 ImplicationChecksByTransitivity, 21.5s TimeCoverageRelationStatistics Valid=605, Invalid=6194, Unknown=7, NotChecked=0, Total=6806 [2021-11-21 00:15:24,674 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 97 mSDsluCounter, 548 mSDsCounter, 0 mSdLazyCounter, 1264 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 519 SdHoareTripleChecker+Invalid, 1459 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 1264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 70 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:15:24,674 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 519 Invalid, 1459 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 1264 Invalid, 0 Unknown, 70 Unchecked, 0.8s Time] [2021-11-21 00:15:24,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-21 00:15:24,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2021-11-21 00:15:24,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 00:15:24,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2021-11-21 00:15:24,701 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 79 [2021-11-21 00:15:24,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:15:24,702 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2021-11-21 00:15:24,703 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 2.0) internal successors, (92), 43 states have internal predecessors, (92), 19 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (21), 21 states have call predecessors, (21), 19 states have call successors, (21) [2021-11-21 00:15:24,703 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2021-11-21 00:15:24,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-21 00:15:24,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:15:24,704 INFO L514 BasicCegarLoop]: trace histogram [11, 9, 9, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:15:24,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-21 00:15:24,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:15:24,929 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:15:24,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:15:24,929 INFO L85 PathProgramCache]: Analyzing trace with hash -498474492, now seen corresponding path program 23 times [2021-11-21 00:15:24,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:15:24,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835586168] [2021-11-21 00:15:24,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:15:24,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:15:24,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:15:25,414 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 10 proven. 225 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-21 00:15:25,414 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:15:25,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835586168] [2021-11-21 00:15:25,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1835586168] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:15:25,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [243852308] [2021-11-21 00:15:25,414 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:15:25,414 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:15:25,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:15:25,415 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:15:25,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-21 00:15:25,587 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-21 00:15:25,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:15:25,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-21 00:15:25,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:15:26,167 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 39 treesize of output 35 [2021-11-21 00:15:27,106 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-11-21 00:15:27,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 71 treesize of output 50 [2021-11-21 00:15:27,148 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 102 proven. 133 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-21 00:15:27,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:15:28,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 30 [2021-11-21 00:15:28,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 47 [2021-11-21 00:15:28,926 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 94 proven. 141 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-21 00:15:28,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [243852308] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:15:28,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715354227] [2021-11-21 00:15:28,927 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:15:28,928 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:15:28,928 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:15:28,928 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:15:28,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:15:29,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:29,145 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:15:29,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:15:29,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:29,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:15:30,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:30,128 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 31 treesize of output 33 [2021-11-21 00:15:31,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:31,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:31,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:31,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:31,614 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:15:31,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:15:32,357 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 20 treesize of output 16 [2021-11-21 00:15:33,748 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:15:33,765 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:15:34,930 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:15:34,930 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:15:34,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 67 [2021-11-21 00:15:34,930 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865295376] [2021-11-21 00:15:34,930 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:15:34,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-21 00:15:34,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:15:34,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-21 00:15:34,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=550, Invalid=5612, Unknown=0, NotChecked=0, Total=6162 [2021-11-21 00:15:34,932 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand has 67 states, 66 states have (on average 2.1515151515151514) internal successors, (142), 62 states have internal predecessors, (142), 28 states have call successors, (29), 1 states have call predecessors, (29), 2 states have return successors, (30), 30 states have call predecessors, (30), 28 states have call successors, (30) [2021-11-21 00:15:38,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:15:38,019 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2021-11-21 00:15:38,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-21 00:15:38,020 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 2.1515151515151514) internal successors, (142), 62 states have internal predecessors, (142), 28 states have call successors, (29), 1 states have call predecessors, (29), 2 states have return successors, (30), 30 states have call predecessors, (30), 28 states have call successors, (30) Word has length 82 [2021-11-21 00:15:38,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:15:38,021 INFO L225 Difference]: With dead ends: 112 [2021-11-21 00:15:38,021 INFO L226 Difference]: Without dead ends: 82 [2021-11-21 00:15:38,023 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 201 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3878 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=1190, Invalid=12150, Unknown=0, NotChecked=0, Total=13340 [2021-11-21 00:15:38,023 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 7 mSDsluCounter, 519 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 521 SdHoareTripleChecker+Invalid, 629 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:15:38,024 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 521 Invalid, 629 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 514 Invalid, 0 Unknown, 81 Unchecked, 0.3s Time] [2021-11-21 00:15:38,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-21 00:15:38,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-11-21 00:15:38,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 60 states have internal predecessors, (62), 12 states have call successors, (12), 9 states have call predecessors, (12), 9 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 00:15:38,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-11-21 00:15:38,041 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 82 [2021-11-21 00:15:38,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:15:38,041 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-11-21 00:15:38,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 2.1515151515151514) internal successors, (142), 62 states have internal predecessors, (142), 28 states have call successors, (29), 1 states have call predecessors, (29), 2 states have return successors, (30), 30 states have call predecessors, (30), 28 states have call successors, (30) [2021-11-21 00:15:38,042 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-11-21 00:15:38,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-21 00:15:38,042 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:15:38,042 INFO L514 BasicCegarLoop]: trace histogram [12, 10, 10, 10, 10, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:15:38,068 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-21 00:15:38,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-21 00:15:38,243 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:15:38,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:15:38,244 INFO L85 PathProgramCache]: Analyzing trace with hash -53554493, now seen corresponding path program 24 times [2021-11-21 00:15:38,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:15:38,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [6338569] [2021-11-21 00:15:38,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:15:38,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:15:38,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:15:38,816 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 10 proven. 255 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-21 00:15:38,816 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:15:38,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [6338569] [2021-11-21 00:15:38,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [6338569] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:15:38,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [192509591] [2021-11-21 00:15:38,817 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:15:38,817 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:15:38,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:15:38,818 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:15:38,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-21 00:15:38,901 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:15:38,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:15:38,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-21 00:15:38,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:15:39,549 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 23 treesize of output 19 [2021-11-21 00:15:39,775 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:15:39,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:15:40,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:15:40,452 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 30 proven. 255 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-21 00:15:40,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:15:52,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [192509591] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:15:52,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1893770175] [2021-11-21 00:15:52,877 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:15:52,877 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:15:52,877 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:15:52,877 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:15:52,877 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:15:53,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:53,159 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:15:53,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:15:53,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:53,217 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:15:53,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:15:54,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:54,313 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 35 treesize of output 37 [2021-11-21 00:15:56,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:56,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:56,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:56,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:56,641 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:15:56,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:15:57,090 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 20 treesize of output 16 [2021-11-21 00:15:58,358 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:15:58,379 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:15:59,794 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:15:59,794 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:15:59,794 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 51 [2021-11-21 00:15:59,794 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311007388] [2021-11-21 00:15:59,794 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:15:59,795 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-21 00:15:59,795 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:15:59,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-21 00:15:59,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=3878, Unknown=5, NotChecked=0, Total=4160 [2021-11-21 00:15:59,796 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 51 states, 50 states have (on average 2.04) internal successors, (102), 47 states have internal predecessors, (102), 21 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (23), 23 states have call predecessors, (23), 21 states have call successors, (23) [2021-11-21 00:16:01,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:16:01,493 INFO L93 Difference]: Finished difference Result 95 states and 98 transitions. [2021-11-21 00:16:01,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-21 00:16:01,493 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 2.04) internal successors, (102), 47 states have internal predecessors, (102), 21 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (23), 23 states have call predecessors, (23), 21 states have call successors, (23) Word has length 87 [2021-11-21 00:16:01,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:16:01,496 INFO L225 Difference]: With dead ends: 95 [2021-11-21 00:16:01,496 INFO L226 Difference]: Without dead ends: 93 [2021-11-21 00:16:01,497 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 175 SyntacticMatches, 2 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2192 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=644, Invalid=7183, Unknown=5, NotChecked=0, Total=7832 [2021-11-21 00:16:01,497 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 94 mSDsluCounter, 573 mSDsCounter, 0 mSdLazyCounter, 1669 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 572 SdHoareTripleChecker+Invalid, 1843 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 1669 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:16:01,498 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 572 Invalid, 1843 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 1669 Invalid, 0 Unknown, 53 Unchecked, 1.0s Time] [2021-11-21 00:16:01,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-21 00:16:01,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 87. [2021-11-21 00:16:01,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 64 states have (on average 1.03125) internal successors, (66), 64 states have internal predecessors, (66), 12 states have call successors, (12), 10 states have call predecessors, (12), 10 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 00:16:01,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2021-11-21 00:16:01,515 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 87 [2021-11-21 00:16:01,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:16:01,515 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2021-11-21 00:16:01,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 2.04) internal successors, (102), 47 states have internal predecessors, (102), 21 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (23), 23 states have call predecessors, (23), 21 states have call successors, (23) [2021-11-21 00:16:01,516 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2021-11-21 00:16:01,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-21 00:16:01,516 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:16:01,517 INFO L514 BasicCegarLoop]: trace histogram [12, 10, 10, 10, 10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:16:01,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-21 00:16:01,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-21 00:16:01,729 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:16:01,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:16:01,729 INFO L85 PathProgramCache]: Analyzing trace with hash -2003522715, now seen corresponding path program 25 times [2021-11-21 00:16:01,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:16:01,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255628600] [2021-11-21 00:16:01,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:16:01,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:16:01,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:16:02,357 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 11 proven. 280 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-21 00:16:02,357 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:16:02,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255628600] [2021-11-21 00:16:02,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255628600] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:16:02,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917395057] [2021-11-21 00:16:02,357 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:16:02,357 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:16:02,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:16:02,359 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:16:02,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-21 00:16:02,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:16:02,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-21 00:16:02,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:16:03,233 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 29 treesize of output 25 [2021-11-21 00:16:03,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:16:04,004 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 11 proven. 280 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-21 00:16:04,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:16:04,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:16:04,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:16:04,616 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 11 proven. 280 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-21 00:16:04,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917395057] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:16:04,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [134759314] [2021-11-21 00:16:04,618 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:16:04,618 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:16:04,618 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:16:04,619 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:16:04,619 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:16:04,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:04,914 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:16:04,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:16:04,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:04,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:16:05,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:05,979 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 31 treesize of output 33 [2021-11-21 00:16:07,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:07,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:07,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:07,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:07,458 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:16:07,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:16:08,198 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 20 treesize of output 16 [2021-11-21 00:16:09,516 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:16:09,535 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:16:10,876 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:16:10,876 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:16:10,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2021-11-21 00:16:10,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206688220] [2021-11-21 00:16:10,876 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:16:10,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-21 00:16:10,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:16:10,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-21 00:16:10,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=3805, Unknown=0, NotChecked=0, Total=4032 [2021-11-21 00:16:10,878 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand has 52 states, 51 states have (on average 2.196078431372549) internal successors, (112), 48 states have internal predecessors, (112), 21 states have call successors, (22), 1 states have call predecessors, (22), 2 states have return successors, (23), 23 states have call predecessors, (23), 21 states have call successors, (23) [2021-11-21 00:16:12,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:16:12,905 INFO L93 Difference]: Finished difference Result 136 states and 142 transitions. [2021-11-21 00:16:12,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-21 00:16:12,905 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 2.196078431372549) internal successors, (112), 48 states have internal predecessors, (112), 21 states have call successors, (22), 1 states have call predecessors, (22), 2 states have return successors, (23), 23 states have call predecessors, (23), 21 states have call successors, (23) Word has length 90 [2021-11-21 00:16:12,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:16:12,906 INFO L225 Difference]: With dead ends: 136 [2021-11-21 00:16:12,906 INFO L226 Difference]: Without dead ends: 134 [2021-11-21 00:16:12,907 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 231 SyntacticMatches, 3 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2578 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=616, Invalid=8890, Unknown=0, NotChecked=0, Total=9506 [2021-11-21 00:16:12,908 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 119 mSDsluCounter, 787 mSDsCounter, 0 mSdLazyCounter, 1986 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 784 SdHoareTripleChecker+Invalid, 2182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 1986 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:16:12,908 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 784 Invalid, 2182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 1986 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-21 00:16:12,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-21 00:16:12,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 93. [2021-11-21 00:16:12,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 69 states have (on average 1.0434782608695652) internal successors, (72), 69 states have internal predecessors, (72), 13 states have call successors, (13), 10 states have call predecessors, (13), 10 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-21 00:16:12,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 98 transitions. [2021-11-21 00:16:12,938 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 98 transitions. Word has length 90 [2021-11-21 00:16:12,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:16:12,938 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 98 transitions. [2021-11-21 00:16:12,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 2.196078431372549) internal successors, (112), 48 states have internal predecessors, (112), 21 states have call successors, (22), 1 states have call predecessors, (22), 2 states have return successors, (23), 23 states have call predecessors, (23), 21 states have call successors, (23) [2021-11-21 00:16:12,939 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 98 transitions. [2021-11-21 00:16:12,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-21 00:16:12,940 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:16:12,940 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:16:12,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-21 00:16:13,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-21 00:16:13,153 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:16:13,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:16:13,154 INFO L85 PathProgramCache]: Analyzing trace with hash 220821379, now seen corresponding path program 26 times [2021-11-21 00:16:13,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:16:13,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585347835] [2021-11-21 00:16:13,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:16:13,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:16:13,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:16:13,496 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 127 proven. 173 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-21 00:16:13,496 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:16:13,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [585347835] [2021-11-21 00:16:13,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [585347835] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:16:13,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364276598] [2021-11-21 00:16:13,496 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:16:13,497 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:16:13,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:16:13,501 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:16:13,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-21 00:16:13,921 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-21 00:16:13,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:16:13,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 00:16:13,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:16:14,541 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 155 proven. 145 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-21 00:16:14,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:16:14,793 INFO L134 CoverageAnalysis]: Checked inductivity of 432 backedges. 155 proven. 145 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-21 00:16:14,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364276598] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:16:14,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [836562322] [2021-11-21 00:16:14,795 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:16:14,795 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:16:14,795 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:16:14,795 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:16:14,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:16:15,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:15,138 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:16:15,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:16:15,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:15,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:16:16,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:16,229 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 31 treesize of output 33 [2021-11-21 00:16:17,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:17,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:17,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:17,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:17,856 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:16:17,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:16:18,612 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 20 treesize of output 16 [2021-11-21 00:16:19,974 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:16:19,994 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:16:20,998 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:16:20,998 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:16:20,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2021-11-21 00:16:20,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826979510] [2021-11-21 00:16:20,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:16:21,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-21 00:16:21,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:16:21,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-21 00:16:21,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=1986, Unknown=0, NotChecked=0, Total=2352 [2021-11-21 00:16:21,001 INFO L87 Difference]: Start difference. First operand 93 states and 98 transitions. Second operand has 37 states, 37 states have (on average 2.6216216216216215) internal successors, (97), 37 states have internal predecessors, (97), 12 states have call successors, (13), 1 states have call predecessors, (13), 1 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2021-11-21 00:16:21,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:16:21,393 INFO L93 Difference]: Finished difference Result 139 states and 145 transitions. [2021-11-21 00:16:21,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-21 00:16:21,393 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.6216216216216215) internal successors, (97), 37 states have internal predecessors, (97), 12 states have call successors, (13), 1 states have call predecessors, (13), 1 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) Word has length 93 [2021-11-21 00:16:21,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:16:21,394 INFO L225 Difference]: With dead ends: 139 [2021-11-21 00:16:21,394 INFO L226 Difference]: Without dead ends: 103 [2021-11-21 00:16:21,395 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 254 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1070 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=571, Invalid=2851, Unknown=0, NotChecked=0, Total=3422 [2021-11-21 00:16:21,396 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 97 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:16:21,396 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 169 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 281 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:16:21,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-21 00:16:21,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 90. [2021-11-21 00:16:21,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 13 states have call successors, (13), 10 states have call predecessors, (13), 10 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-21 00:16:21,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2021-11-21 00:16:21,424 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 93 [2021-11-21 00:16:21,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:16:21,425 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2021-11-21 00:16:21,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.6216216216216215) internal successors, (97), 37 states have internal predecessors, (97), 12 states have call successors, (13), 1 states have call predecessors, (13), 1 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2021-11-21 00:16:21,425 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2021-11-21 00:16:21,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-21 00:16:21,426 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:16:21,427 INFO L514 BasicCegarLoop]: trace histogram [13, 11, 11, 11, 11, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:16:21,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-21 00:16:21,629 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-21 00:16:21,629 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:16:21,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:16:21,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1506251484, now seen corresponding path program 27 times [2021-11-21 00:16:21,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:16:21,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576369085] [2021-11-21 00:16:21,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:16:21,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:16:21,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:16:22,393 INFO L134 CoverageAnalysis]: Checked inductivity of 458 backedges. 11 proven. 313 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-21 00:16:22,393 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:16:22,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576369085] [2021-11-21 00:16:22,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576369085] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:16:22,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035885765] [2021-11-21 00:16:22,394 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:16:22,394 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:16:22,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:16:22,395 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:16:22,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-21 00:16:22,558 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:16:22,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:16:22,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-21 00:16:22,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:16:23,407 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 23 treesize of output 19 [2021-11-21 00:16:23,661 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:16:23,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:16:24,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:16:24,554 INFO L134 CoverageAnalysis]: Checked inductivity of 458 backedges. 33 proven. 313 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-21 00:16:24,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:16:34,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035885765] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:16:34,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1276767960] [2021-11-21 00:16:34,881 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:16:34,881 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:16:34,881 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:16:34,882 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:16:34,882 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:16:35,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:35,177 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:16:35,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:16:35,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:35,232 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:16:35,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:16:36,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:36,287 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 31 treesize of output 33 [2021-11-21 00:16:37,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:37,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:37,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:37,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:37,772 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:16:37,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:16:38,506 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 20 treesize of output 16 [2021-11-21 00:16:39,815 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:16:39,834 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:16:41,331 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:16:41,332 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:16:41,332 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 56 [2021-11-21 00:16:41,332 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103413960] [2021-11-21 00:16:41,332 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:16:41,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-21 00:16:41,333 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:16:41,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-21 00:16:41,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=4525, Unknown=4, NotChecked=0, Total=4830 [2021-11-21 00:16:41,333 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 56 states, 54 states have (on average 2.074074074074074) internal successors, (112), 52 states have internal predecessors, (112), 23 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (25), 25 states have call predecessors, (25), 23 states have call successors, (25) [2021-11-21 00:16:43,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:16:43,369 INFO L93 Difference]: Finished difference Result 103 states and 106 transitions. [2021-11-21 00:16:43,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-21 00:16:43,370 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 54 states have (on average 2.074074074074074) internal successors, (112), 52 states have internal predecessors, (112), 23 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (25), 25 states have call predecessors, (25), 23 states have call successors, (25) Word has length 95 [2021-11-21 00:16:43,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:16:43,371 INFO L225 Difference]: With dead ends: 103 [2021-11-21 00:16:43,371 INFO L226 Difference]: Without dead ends: 101 [2021-11-21 00:16:43,372 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 195 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2549 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=722, Invalid=8394, Unknown=4, NotChecked=0, Total=9120 [2021-11-21 00:16:43,372 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 148 mSDsluCounter, 628 mSDsCounter, 0 mSdLazyCounter, 1939 mSolverCounterSat, 205 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 615 SdHoareTripleChecker+Invalid, 2219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 205 IncrementalHoareTripleChecker+Valid, 1939 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:16:43,372 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 615 Invalid, 2219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [205 Valid, 1939 Invalid, 0 Unknown, 75 Unchecked, 1.1s Time] [2021-11-21 00:16:43,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-21 00:16:43,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 95. [2021-11-21 00:16:43,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 13 states have call successors, (13), 11 states have call predecessors, (13), 11 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-21 00:16:43,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2021-11-21 00:16:43,394 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 95 [2021-11-21 00:16:43,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:16:43,394 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2021-11-21 00:16:43,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 54 states have (on average 2.074074074074074) internal successors, (112), 52 states have internal predecessors, (112), 23 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (25), 25 states have call predecessors, (25), 23 states have call successors, (25) [2021-11-21 00:16:43,395 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2021-11-21 00:16:43,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-21 00:16:43,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:16:43,396 INFO L514 BasicCegarLoop]: trace histogram [13, 11, 11, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:16:43,432 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2021-11-21 00:16:43,609 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:16:43,609 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:16:43,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:16:43,609 INFO L85 PathProgramCache]: Analyzing trace with hash 1085860196, now seen corresponding path program 28 times [2021-11-21 00:16:43,610 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:16:43,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418574208] [2021-11-21 00:16:43,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:16:43,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:16:43,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:16:44,430 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 12 proven. 341 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-21 00:16:44,430 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:16:44,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418574208] [2021-11-21 00:16:44,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [418574208] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:16:44,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [165591935] [2021-11-21 00:16:44,431 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:16:44,431 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:16:44,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:16:44,433 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:16:44,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-21 00:16:44,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:16:44,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-21 00:16:44,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:16:45,564 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 29 treesize of output 25 [2021-11-21 00:16:46,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:16:46,466 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 12 proven. 341 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-21 00:16:46,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:16:46,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:16:46,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:16:47,160 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 12 proven. 341 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-21 00:16:47,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [165591935] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:16:47,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1556714401] [2021-11-21 00:16:47,162 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:16:47,162 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:16:47,163 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:16:47,163 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:16:47,163 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:16:47,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:47,460 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:16:47,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:16:47,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:47,521 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:16:47,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:16:48,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:48,592 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 35 treesize of output 37 [2021-11-21 00:16:50,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:50,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:50,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:50,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:50,892 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:16:50,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:16:51,420 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 20 treesize of output 16 [2021-11-21 00:16:52,734 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:16:52,753 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:16:54,166 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:16:54,167 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:16:54,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 58 [2021-11-21 00:16:54,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839480472] [2021-11-21 00:16:54,167 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:16:54,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-21 00:16:54,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:16:54,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-21 00:16:54,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=4579, Unknown=0, NotChecked=0, Total=4830 [2021-11-21 00:16:54,168 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand has 58 states, 56 states have (on average 2.2142857142857144) internal successors, (124), 53 states have internal predecessors, (124), 24 states have call successors, (25), 1 states have call predecessors, (25), 2 states have return successors, (26), 26 states have call predecessors, (26), 24 states have call successors, (26) [2021-11-21 00:16:56,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:16:56,778 INFO L93 Difference]: Finished difference Result 147 states and 153 transitions. [2021-11-21 00:16:56,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-21 00:16:56,779 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 56 states have (on average 2.2142857142857144) internal successors, (124), 53 states have internal predecessors, (124), 24 states have call successors, (25), 1 states have call predecessors, (25), 2 states have return successors, (26), 26 states have call predecessors, (26), 24 states have call successors, (26) Word has length 98 [2021-11-21 00:16:56,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:16:56,781 INFO L225 Difference]: With dead ends: 147 [2021-11-21 00:16:56,781 INFO L226 Difference]: Without dead ends: 145 [2021-11-21 00:16:56,782 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 252 SyntacticMatches, 3 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3087 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=678, Invalid=10664, Unknown=0, NotChecked=0, Total=11342 [2021-11-21 00:16:56,783 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 131 mSDsluCounter, 920 mSDsCounter, 0 mSdLazyCounter, 2479 mSolverCounterSat, 225 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 919 SdHoareTripleChecker+Invalid, 2704 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 225 IncrementalHoareTripleChecker+Valid, 2479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:16:56,783 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 919 Invalid, 2704 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [225 Valid, 2479 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-21 00:16:56,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-11-21 00:16:56,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 101. [2021-11-21 00:16:56,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 75 states have (on average 1.04) internal successors, (78), 75 states have internal predecessors, (78), 14 states have call successors, (14), 11 states have call predecessors, (14), 11 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-21 00:16:56,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 106 transitions. [2021-11-21 00:16:56,817 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 106 transitions. Word has length 98 [2021-11-21 00:16:56,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:16:56,817 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 106 transitions. [2021-11-21 00:16:56,818 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 56 states have (on average 2.2142857142857144) internal successors, (124), 53 states have internal predecessors, (124), 24 states have call successors, (25), 1 states have call predecessors, (25), 2 states have return successors, (26), 26 states have call predecessors, (26), 24 states have call successors, (26) [2021-11-21 00:16:56,818 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 106 transitions. [2021-11-21 00:16:56,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-21 00:16:56,820 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:16:56,820 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:16:56,860 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-11-21 00:16:57,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-21 00:16:57,037 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:16:57,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:16:57,037 INFO L85 PathProgramCache]: Analyzing trace with hash -827063004, now seen corresponding path program 29 times [2021-11-21 00:16:57,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:16:57,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716508376] [2021-11-21 00:16:57,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:16:57,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:16:57,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:16:57,424 INFO L134 CoverageAnalysis]: Checked inductivity of 519 backedges. 156 proven. 207 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-21 00:16:57,424 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:16:57,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716508376] [2021-11-21 00:16:57,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1716508376] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:16:57,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063425756] [2021-11-21 00:16:57,425 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:16:57,425 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:16:57,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:16:57,426 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:16:57,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-21 00:16:58,307 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-21 00:16:58,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:16:58,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-21 00:16:58,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:16:58,937 INFO L134 CoverageAnalysis]: Checked inductivity of 519 backedges. 187 proven. 176 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-21 00:16:58,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:16:59,164 INFO L134 CoverageAnalysis]: Checked inductivity of 519 backedges. 187 proven. 176 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-11-21 00:16:59,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1063425756] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:16:59,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1888941344] [2021-11-21 00:16:59,166 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:16:59,166 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:16:59,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:16:59,166 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:16:59,166 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:16:59,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:59,409 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:16:59,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:16:59,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:16:59,464 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:16:59,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:17:00,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:00,463 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 31 treesize of output 33 [2021-11-21 00:17:01,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:01,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:01,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:01,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:01,993 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:17:01,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:17:02,660 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 20 treesize of output 16 [2021-11-21 00:17:03,995 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:17:04,014 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:17:04,996 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:17:04,996 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:17:04,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2021-11-21 00:17:04,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042596002] [2021-11-21 00:17:04,997 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:17:04,997 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-21 00:17:04,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:17:04,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-21 00:17:04,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=2233, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 00:17:04,999 INFO L87 Difference]: Start difference. First operand 101 states and 106 transitions. Second operand has 40 states, 40 states have (on average 2.625) internal successors, (105), 40 states have internal predecessors, (105), 13 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2021-11-21 00:17:05,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:17:05,533 INFO L93 Difference]: Finished difference Result 150 states and 156 transitions. [2021-11-21 00:17:05,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-21 00:17:05,533 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.625) internal successors, (105), 40 states have internal predecessors, (105), 13 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) Word has length 101 [2021-11-21 00:17:05,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:17:05,534 INFO L225 Difference]: With dead ends: 150 [2021-11-21 00:17:05,535 INFO L226 Difference]: Without dead ends: 111 [2021-11-21 00:17:05,535 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 277 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=661, Invalid=3245, Unknown=0, NotChecked=0, Total=3906 [2021-11-21 00:17:05,536 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 164 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 361 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 462 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 361 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:17:05,536 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [165 Valid, 180 Invalid, 462 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 361 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:17:05,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-21 00:17:05,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 98. [2021-11-21 00:17:05,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 72 states have (on average 1.0277777777777777) internal successors, (74), 72 states have internal predecessors, (74), 14 states have call successors, (14), 11 states have call predecessors, (14), 11 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-21 00:17:05,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 102 transitions. [2021-11-21 00:17:05,560 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 102 transitions. Word has length 101 [2021-11-21 00:17:05,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:17:05,561 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 102 transitions. [2021-11-21 00:17:05,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.625) internal successors, (105), 40 states have internal predecessors, (105), 13 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2021-11-21 00:17:05,561 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 102 transitions. [2021-11-21 00:17:05,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-21 00:17:05,562 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:17:05,562 INFO L514 BasicCegarLoop]: trace histogram [14, 12, 12, 12, 12, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:17:05,588 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-21 00:17:05,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-21 00:17:05,763 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:17:05,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:17:05,763 INFO L85 PathProgramCache]: Analyzing trace with hash 1109031971, now seen corresponding path program 30 times [2021-11-21 00:17:05,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:17:05,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1289334600] [2021-11-21 00:17:05,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:17:05,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:17:05,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:17:06,518 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 377 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:17:06,518 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:17:06,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1289334600] [2021-11-21 00:17:06,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1289334600] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:17:06,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999674396] [2021-11-21 00:17:06,519 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:17:06,519 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:17:06,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:17:06,520 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:17:06,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-21 00:17:06,654 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:17:06,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:17:06,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 360 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-21 00:17:06,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:17:07,487 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 23 treesize of output 19 [2021-11-21 00:17:07,710 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:17:07,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:17:08,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:17:08,480 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 36 proven. 377 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-21 00:17:08,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:17:22,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999674396] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:17:22,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2066605708] [2021-11-21 00:17:22,825 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:17:22,825 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:17:22,825 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:17:22,826 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:17:22,826 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:17:23,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:23,046 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:17:23,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:17:23,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:23,087 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:17:23,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:17:23,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:23,980 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 35 treesize of output 37 [2021-11-21 00:17:25,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:25,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:25,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:25,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:25,742 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:17:25,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:17:26,208 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 20 treesize of output 16 [2021-11-21 00:17:27,399 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:17:27,413 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:17:28,597 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:17:28,597 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:17:28,597 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 60 [2021-11-21 00:17:28,597 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48841644] [2021-11-21 00:17:28,597 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:17:28,598 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-21 00:17:28,598 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:17:28,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-21 00:17:28,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=5075, Unknown=7, NotChecked=0, Total=5402 [2021-11-21 00:17:28,599 INFO L87 Difference]: Start difference. First operand 98 states and 102 transitions. Second operand has 60 states, 58 states have (on average 2.103448275862069) internal successors, (122), 56 states have internal predecessors, (122), 25 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (27), 27 states have call predecessors, (27), 25 states have call successors, (27) [2021-11-21 00:17:30,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:17:30,548 INFO L93 Difference]: Finished difference Result 111 states and 114 transitions. [2021-11-21 00:17:30,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-21 00:17:30,549 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 58 states have (on average 2.103448275862069) internal successors, (122), 56 states have internal predecessors, (122), 25 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (27), 27 states have call predecessors, (27), 25 states have call successors, (27) Word has length 103 [2021-11-21 00:17:30,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:17:30,550 INFO L225 Difference]: With dead ends: 111 [2021-11-21 00:17:30,550 INFO L226 Difference]: Without dead ends: 109 [2021-11-21 00:17:30,550 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 213 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2871 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=777, Invalid=9518, Unknown=7, NotChecked=0, Total=10302 [2021-11-21 00:17:30,551 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 141 mSDsluCounter, 831 mSDsCounter, 0 mSdLazyCounter, 2314 mSolverCounterSat, 198 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 809 SdHoareTripleChecker+Invalid, 2597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 198 IncrementalHoareTripleChecker+Valid, 2314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 85 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:17:30,551 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 809 Invalid, 2597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [198 Valid, 2314 Invalid, 0 Unknown, 85 Unchecked, 1.1s Time] [2021-11-21 00:17:30,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-21 00:17:30,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 103. [2021-11-21 00:17:30,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 76 states have (on average 1.0263157894736843) internal successors, (78), 76 states have internal predecessors, (78), 14 states have call successors, (14), 12 states have call predecessors, (14), 12 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-21 00:17:30,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2021-11-21 00:17:30,577 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 103 [2021-11-21 00:17:30,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:17:30,577 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2021-11-21 00:17:30,578 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 58 states have (on average 2.103448275862069) internal successors, (122), 56 states have internal predecessors, (122), 25 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (27), 27 states have call predecessors, (27), 25 states have call successors, (27) [2021-11-21 00:17:30,578 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2021-11-21 00:17:30,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-21 00:17:30,579 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:17:30,579 INFO L514 BasicCegarLoop]: trace histogram [14, 12, 12, 12, 12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:17:30,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-21 00:17:30,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:17:30,793 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:17:30,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:17:30,793 INFO L85 PathProgramCache]: Analyzing trace with hash -2006448635, now seen corresponding path program 31 times [2021-11-21 00:17:30,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:17:30,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082479063] [2021-11-21 00:17:30,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:17:30,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:17:30,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:17:31,841 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 13 proven. 408 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:17:31,841 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:17:31,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082479063] [2021-11-21 00:17:31,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082479063] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:17:31,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331239131] [2021-11-21 00:17:31,842 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:17:31,842 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:17:31,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:17:31,843 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:17:31,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-21 00:17:31,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:17:31,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-21 00:17:31,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:17:32,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 25 [2021-11-21 00:17:33,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:17:33,325 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 13 proven. 408 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:17:33,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:17:33,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:17:33,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:17:34,765 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 13 proven. 408 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:17:34,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331239131] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:17:34,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [585436272] [2021-11-21 00:17:34,766 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:17:34,767 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:17:34,767 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:17:34,767 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:17:34,767 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:17:34,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:35,019 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:17:35,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:17:35,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:35,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:17:35,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:35,917 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 31 treesize of output 33 [2021-11-21 00:17:37,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:37,044 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:17:37,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:17:37,565 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 20 treesize of output 16 [2021-11-21 00:17:38,623 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:17:38,639 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:17:40,019 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:17:40,019 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:17:40,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 87 [2021-11-21 00:17:40,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026004466] [2021-11-21 00:17:40,020 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:17:40,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-21 00:17:40,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:17:40,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-21 00:17:40,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=9283, Unknown=0, NotChecked=0, Total=9702 [2021-11-21 00:17:40,021 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand has 87 states, 85 states have (on average 2.211764705882353) internal successors, (188), 81 states have internal predecessors, (188), 38 states have call successors, (39), 1 states have call predecessors, (39), 2 states have return successors, (40), 40 states have call predecessors, (40), 38 states have call successors, (40) [2021-11-21 00:17:44,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:17:44,762 INFO L93 Difference]: Finished difference Result 158 states and 164 transitions. [2021-11-21 00:17:44,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-21 00:17:44,763 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 85 states have (on average 2.211764705882353) internal successors, (188), 81 states have internal predecessors, (188), 38 states have call successors, (39), 1 states have call predecessors, (39), 2 states have return successors, (40), 40 states have call predecessors, (40), 38 states have call successors, (40) Word has length 106 [2021-11-21 00:17:44,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:17:44,764 INFO L225 Difference]: With dead ends: 158 [2021-11-21 00:17:44,764 INFO L226 Difference]: Without dead ends: 156 [2021-11-21 00:17:44,766 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 251 SyntacticMatches, 1 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6421 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=1260, Invalid=21996, Unknown=0, NotChecked=0, Total=23256 [2021-11-21 00:17:44,767 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 296 mSDsluCounter, 1062 mSDsCounter, 0 mSdLazyCounter, 3221 mSolverCounterSat, 461 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 297 SdHoareTripleChecker+Valid, 1065 SdHoareTripleChecker+Invalid, 3682 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 461 IncrementalHoareTripleChecker+Valid, 3221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:17:44,767 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [297 Valid, 1065 Invalid, 3682 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [461 Valid, 3221 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-21 00:17:44,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-21 00:17:44,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 109. [2021-11-21 00:17:44,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 81 states have (on average 1.037037037037037) internal successors, (84), 81 states have internal predecessors, (84), 15 states have call successors, (15), 12 states have call predecessors, (15), 12 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-21 00:17:44,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 114 transitions. [2021-11-21 00:17:44,807 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 114 transitions. Word has length 106 [2021-11-21 00:17:44,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:17:44,807 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 114 transitions. [2021-11-21 00:17:44,808 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 85 states have (on average 2.211764705882353) internal successors, (188), 81 states have internal predecessors, (188), 38 states have call successors, (39), 1 states have call predecessors, (39), 2 states have return successors, (40), 40 states have call predecessors, (40), 38 states have call successors, (40) [2021-11-21 00:17:44,808 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 114 transitions. [2021-11-21 00:17:44,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-21 00:17:44,809 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:17:44,809 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:17:44,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-21 00:17:45,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:17:45,029 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:17:45,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:17:45,029 INFO L85 PathProgramCache]: Analyzing trace with hash -1045915421, now seen corresponding path program 32 times [2021-11-21 00:17:45,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:17:45,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660746635] [2021-11-21 00:17:45,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:17:45,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:17:45,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:17:45,359 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 188 proven. 244 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-11-21 00:17:45,359 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:17:45,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660746635] [2021-11-21 00:17:45,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [660746635] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:17:45,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414271535] [2021-11-21 00:17:45,360 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:17:45,360 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:17:45,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:17:45,365 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:17:45,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-21 00:17:45,791 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-21 00:17:45,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:17:45,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-21 00:17:45,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:17:46,364 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 222 proven. 210 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-11-21 00:17:46,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:17:46,614 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 222 proven. 210 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-11-21 00:17:46,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1414271535] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:17:46,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1725997037] [2021-11-21 00:17:46,615 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:17:46,615 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:17:46,615 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:17:46,615 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:17:46,615 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:17:46,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:46,844 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:17:46,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:17:46,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:46,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:17:47,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:47,871 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 35 treesize of output 37 [2021-11-21 00:17:49,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:49,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:49,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:49,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:17:49,835 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:17:49,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:17:50,228 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 20 treesize of output 16 [2021-11-21 00:17:51,330 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:17:51,347 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:17:52,252 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:17:52,252 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:17:52,252 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2021-11-21 00:17:52,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599002775] [2021-11-21 00:17:52,253 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:17:52,253 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-21 00:17:52,253 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:17:52,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-21 00:17:52,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=476, Invalid=2494, Unknown=0, NotChecked=0, Total=2970 [2021-11-21 00:17:52,254 INFO L87 Difference]: Start difference. First operand 109 states and 114 transitions. Second operand has 43 states, 43 states have (on average 2.627906976744186) internal successors, (113), 43 states have internal predecessors, (113), 14 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) [2021-11-21 00:17:52,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:17:52,665 INFO L93 Difference]: Finished difference Result 161 states and 167 transitions. [2021-11-21 00:17:52,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-21 00:17:52,665 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.627906976744186) internal successors, (113), 43 states have internal predecessors, (113), 14 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) Word has length 109 [2021-11-21 00:17:52,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:17:52,666 INFO L225 Difference]: With dead ends: 161 [2021-11-21 00:17:52,666 INFO L226 Difference]: Without dead ends: 119 [2021-11-21 00:17:52,667 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 300 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1364 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=758, Invalid=3664, Unknown=0, NotChecked=0, Total=4422 [2021-11-21 00:17:52,667 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 141 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 460 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:17:52,667 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 180 Invalid, 460 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 360 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:17:52,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-21 00:17:52,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 106. [2021-11-21 00:17:52,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 15 states have call successors, (15), 12 states have call predecessors, (15), 12 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-21 00:17:52,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 110 transitions. [2021-11-21 00:17:52,688 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 110 transitions. Word has length 109 [2021-11-21 00:17:52,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:17:52,688 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 110 transitions. [2021-11-21 00:17:52,688 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.627906976744186) internal successors, (113), 43 states have internal predecessors, (113), 14 states have call successors, (15), 1 states have call predecessors, (15), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) [2021-11-21 00:17:52,689 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 110 transitions. [2021-11-21 00:17:52,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-21 00:17:52,689 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:17:52,690 INFO L514 BasicCegarLoop]: trace histogram [15, 13, 13, 13, 13, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:17:52,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-21 00:17:52,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-21 00:17:52,903 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:17:52,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:17:52,903 INFO L85 PathProgramCache]: Analyzing trace with hash 1059482052, now seen corresponding path program 33 times [2021-11-21 00:17:52,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:17:52,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885124616] [2021-11-21 00:17:52,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:17:52,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:17:52,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:17:53,770 INFO L134 CoverageAnalysis]: Checked inductivity of 644 backedges. 13 proven. 447 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-21 00:17:53,771 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:17:53,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885124616] [2021-11-21 00:17:53,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1885124616] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:17:53,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835187079] [2021-11-21 00:17:53,771 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:17:53,771 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:17:53,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:17:53,772 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:17:53,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-21 00:17:53,937 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:17:53,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:17:53,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-21 00:17:53,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:17:54,652 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 23 treesize of output 19 [2021-11-21 00:17:54,868 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:17:54,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:17:55,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:17:55,657 INFO L134 CoverageAnalysis]: Checked inductivity of 644 backedges. 39 proven. 447 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-11-21 00:17:55,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:18:04,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [835187079] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:04,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1109113187] [2021-11-21 00:18:04,437 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:18:04,437 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:18:04,437 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:18:04,437 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:18:04,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:18:04,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:04,668 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:18:04,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:18:04,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:04,714 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:18:04,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:18:05,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:05,623 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 35 treesize of output 37 [2021-11-21 00:18:07,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:07,735 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:18:07,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:18:08,166 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 20 treesize of output 16 [2021-11-21 00:18:09,327 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:18:09,345 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:18:10,774 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:18:10,774 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:18:10,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 64 [2021-11-21 00:18:10,774 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509588524] [2021-11-21 00:18:10,774 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:18:10,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-21 00:18:10,775 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:10,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-21 00:18:10,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=7600, Unknown=4, NotChecked=0, Total=8010 [2021-11-21 00:18:10,776 INFO L87 Difference]: Start difference. First operand 106 states and 110 transitions. Second operand has 64 states, 62 states have (on average 2.1451612903225805) internal successors, (133), 60 states have internal predecessors, (133), 28 states have call successors, (29), 2 states have call predecessors, (29), 3 states have return successors, (29), 29 states have call predecessors, (29), 28 states have call successors, (29) [2021-11-21 00:18:14,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:14,960 INFO L93 Difference]: Finished difference Result 119 states and 122 transitions. [2021-11-21 00:18:14,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-21 00:18:14,960 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 62 states have (on average 2.1451612903225805) internal successors, (133), 60 states have internal predecessors, (133), 28 states have call successors, (29), 2 states have call predecessors, (29), 3 states have return successors, (29), 29 states have call predecessors, (29), 28 states have call successors, (29) Word has length 111 [2021-11-21 00:18:14,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:14,961 INFO L225 Difference]: With dead ends: 119 [2021-11-21 00:18:14,961 INFO L226 Difference]: Without dead ends: 117 [2021-11-21 00:18:14,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 205 SyntacticMatches, 3 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5191 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=1158, Invalid=16928, Unknown=4, NotChecked=0, Total=18090 [2021-11-21 00:18:14,962 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 162 mSDsluCounter, 1064 mSDsCounter, 0 mSdLazyCounter, 2979 mSolverCounterSat, 268 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 1041 SdHoareTripleChecker+Invalid, 3313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 268 IncrementalHoareTripleChecker+Valid, 2979 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 66 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:14,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 1041 Invalid, 3313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [268 Valid, 2979 Invalid, 0 Unknown, 66 Unchecked, 1.4s Time] [2021-11-21 00:18:14,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-21 00:18:14,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 111. [2021-11-21 00:18:14,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 15 states have call successors, (15), 13 states have call predecessors, (15), 13 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-21 00:18:14,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2021-11-21 00:18:14,988 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 111 [2021-11-21 00:18:14,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:14,988 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2021-11-21 00:18:14,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 62 states have (on average 2.1451612903225805) internal successors, (133), 60 states have internal predecessors, (133), 28 states have call successors, (29), 2 states have call predecessors, (29), 3 states have return successors, (29), 29 states have call predecessors, (29), 28 states have call successors, (29) [2021-11-21 00:18:14,989 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2021-11-21 00:18:14,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-21 00:18:14,989 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:14,990 INFO L514 BasicCegarLoop]: trace histogram [15, 13, 13, 13, 13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:15,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:15,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:15,217 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:15,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:15,217 INFO L85 PathProgramCache]: Analyzing trace with hash -679335740, now seen corresponding path program 34 times [2021-11-21 00:18:15,217 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:15,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292820750] [2021-11-21 00:18:15,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:15,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:15,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:15,905 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 14 proven. 481 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-21 00:18:15,905 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:15,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292820750] [2021-11-21 00:18:15,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292820750] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:15,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1757618968] [2021-11-21 00:18:15,906 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:18:15,906 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:15,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:15,911 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:15,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-21 00:18:15,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:15,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 396 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-21 00:18:15,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:16,879 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 29 treesize of output 25 [2021-11-21 00:18:17,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:18:17,805 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 14 proven. 481 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-21 00:18:17,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:18:17,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:18:17,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:18:18,395 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 14 proven. 481 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-21 00:18:18,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1757618968] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:18:18,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [921281232] [2021-11-21 00:18:18,396 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:18:18,397 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:18:18,397 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:18:18,397 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:18:18,397 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:18:18,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:18,646 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:18:18,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:18:18,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:18,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:18:19,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:19,682 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 31 treesize of output 33 [2021-11-21 00:18:20,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:20,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:20,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:20,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:20,945 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:18:20,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:18:21,496 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 20 treesize of output 16 [2021-11-21 00:18:22,648 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:18:22,663 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:18:23,926 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:18:23,926 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:18:23,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2021-11-21 00:18:23,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157509955] [2021-11-21 00:18:23,927 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:18:23,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-21 00:18:23,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:23,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-21 00:18:23,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=5428, Unknown=0, NotChecked=0, Total=5700 [2021-11-21 00:18:23,929 INFO L87 Difference]: Start difference. First operand 111 states and 114 transitions. Second operand has 64 states, 63 states have (on average 2.253968253968254) internal successors, (142), 60 states have internal predecessors, (142), 27 states have call successors, (28), 1 states have call predecessors, (28), 2 states have return successors, (29), 29 states have call predecessors, (29), 27 states have call successors, (29) [2021-11-21 00:18:26,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:26,602 INFO L93 Difference]: Finished difference Result 169 states and 175 transitions. [2021-11-21 00:18:26,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-21 00:18:26,603 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 63 states have (on average 2.253968253968254) internal successors, (142), 60 states have internal predecessors, (142), 27 states have call successors, (28), 1 states have call predecessors, (28), 2 states have return successors, (29), 29 states have call predecessors, (29), 27 states have call successors, (29) Word has length 114 [2021-11-21 00:18:26,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:26,604 INFO L225 Difference]: With dead ends: 169 [2021-11-21 00:18:26,604 INFO L226 Difference]: Without dead ends: 167 [2021-11-21 00:18:26,606 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 297 SyntacticMatches, 3 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3868 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=766, Invalid=13276, Unknown=0, NotChecked=0, Total=14042 [2021-11-21 00:18:26,606 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 128 mSDsluCounter, 1381 mSDsCounter, 0 mSdLazyCounter, 3299 mSolverCounterSat, 235 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 1369 SdHoareTripleChecker+Invalid, 3534 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 235 IncrementalHoareTripleChecker+Valid, 3299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:26,607 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 1369 Invalid, 3534 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [235 Valid, 3299 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-21 00:18:26,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-21 00:18:26,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 117. [2021-11-21 00:18:26,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 87 states have (on average 1.0344827586206897) internal successors, (90), 87 states have internal predecessors, (90), 16 states have call successors, (16), 13 states have call predecessors, (16), 13 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-21 00:18:26,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 122 transitions. [2021-11-21 00:18:26,642 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 122 transitions. Word has length 114 [2021-11-21 00:18:26,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:26,643 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 122 transitions. [2021-11-21 00:18:26,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 63 states have (on average 2.253968253968254) internal successors, (142), 60 states have internal predecessors, (142), 27 states have call successors, (28), 1 states have call predecessors, (28), 2 states have return successors, (29), 29 states have call predecessors, (29), 27 states have call successors, (29) [2021-11-21 00:18:26,643 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 122 transitions. [2021-11-21 00:18:26,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-21 00:18:26,644 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:26,644 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:26,679 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:26,863 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-21 00:18:26,863 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:26,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:26,864 INFO L85 PathProgramCache]: Analyzing trace with hash -199620156, now seen corresponding path program 35 times [2021-11-21 00:18:26,864 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:26,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559403009] [2021-11-21 00:18:26,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:26,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:26,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:27,261 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 223 proven. 284 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-21 00:18:27,262 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:27,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559403009] [2021-11-21 00:18:27,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559403009] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:27,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697763423] [2021-11-21 00:18:27,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:18:27,262 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:27,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:27,265 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:27,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-21 00:18:27,927 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-21 00:18:27,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:18:27,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-21 00:18:27,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:28,547 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 260 proven. 247 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-21 00:18:28,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:18:28,805 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 260 proven. 247 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-21 00:18:28,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697763423] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:18:28,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1574043945] [2021-11-21 00:18:28,806 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:18:28,806 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:18:28,806 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:18:28,807 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:18:28,807 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:18:29,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:29,036 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:18:29,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:18:29,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:29,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:29,092 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:18:29,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:18:29,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:29,959 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 35 treesize of output 37 [2021-11-21 00:18:32,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:32,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:32,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:32,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:32,068 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:18:32,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:18:32,453 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 20 treesize of output 16 [2021-11-21 00:18:33,558 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:18:33,574 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:18:34,491 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:18:34,491 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:18:34,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 46 [2021-11-21 00:18:34,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804586082] [2021-11-21 00:18:34,492 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:18:34,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-21 00:18:34,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:34,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-21 00:18:34,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=537, Invalid=2769, Unknown=0, NotChecked=0, Total=3306 [2021-11-21 00:18:34,494 INFO L87 Difference]: Start difference. First operand 117 states and 122 transitions. Second operand has 46 states, 46 states have (on average 2.630434782608696) internal successors, (121), 46 states have internal predecessors, (121), 15 states have call successors, (16), 1 states have call predecessors, (16), 1 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) [2021-11-21 00:18:34,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:34,938 INFO L93 Difference]: Finished difference Result 172 states and 178 transitions. [2021-11-21 00:18:34,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-21 00:18:34,939 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.630434782608696) internal successors, (121), 46 states have internal predecessors, (121), 15 states have call successors, (16), 1 states have call predecessors, (16), 1 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) Word has length 117 [2021-11-21 00:18:34,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:34,940 INFO L225 Difference]: With dead ends: 172 [2021-11-21 00:18:34,940 INFO L226 Difference]: Without dead ends: 127 [2021-11-21 00:18:34,941 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 323 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1523 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=862, Invalid=4108, Unknown=0, NotChecked=0, Total=4970 [2021-11-21 00:18:34,941 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 160 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 308 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:34,941 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 177 Invalid, 424 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 308 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:18:34,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-21 00:18:34,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 114. [2021-11-21 00:18:34,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 84 states have (on average 1.0238095238095237) internal successors, (86), 84 states have internal predecessors, (86), 16 states have call successors, (16), 13 states have call predecessors, (16), 13 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-21 00:18:34,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 118 transitions. [2021-11-21 00:18:34,974 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 118 transitions. Word has length 117 [2021-11-21 00:18:34,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:34,974 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 118 transitions. [2021-11-21 00:18:34,975 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.630434782608696) internal successors, (121), 46 states have internal predecessors, (121), 15 states have call successors, (16), 1 states have call predecessors, (16), 1 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) [2021-11-21 00:18:34,975 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 118 transitions. [2021-11-21 00:18:34,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-21 00:18:34,975 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:34,976 INFO L514 BasicCegarLoop]: trace histogram [16, 14, 14, 14, 14, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:35,015 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:35,189 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-21 00:18:35,189 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:35,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:35,189 INFO L85 PathProgramCache]: Analyzing trace with hash 104619395, now seen corresponding path program 36 times [2021-11-21 00:18:35,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:35,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355579229] [2021-11-21 00:18:35,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:35,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:35,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:35,902 INFO L134 CoverageAnalysis]: Checked inductivity of 749 backedges. 14 proven. 523 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2021-11-21 00:18:35,902 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:35,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355579229] [2021-11-21 00:18:35,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355579229] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:35,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1724089721] [2021-11-21 00:18:35,903 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:18:35,903 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:35,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:35,904 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:35,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-21 00:18:36,089 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:18:36,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:18:36,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-21 00:18:36,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:36,981 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 23 treesize of output 19 [2021-11-21 00:18:37,206 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:18:37,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:18:38,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:18:38,136 INFO L134 CoverageAnalysis]: Checked inductivity of 749 backedges. 42 proven. 523 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-21 00:18:38,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:18:40,321 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (<= 15 (select (store (select |c_#memory_int| |c_ULTIMATE.start_main_~#a~0#1.base|) (+ |c_ULTIMATE.start_main_~#a~0#1.offset| (* |c_ULTIMATE.start_main_~i~0#1| 4)) (+ |c_ULTIMATE.start_main_~i~0#1| |c_ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ |c_ULTIMATE.start_main_~#a~0#1.offset| 52)))) is different from false [2021-11-21 00:18:40,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1724089721] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:40,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [893299304] [2021-11-21 00:18:40,330 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:18:40,330 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:18:40,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:18:40,330 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:18:40,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:18:40,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:40,565 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:18:40,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:18:40,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:40,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:18:41,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:41,505 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 35 treesize of output 37 [2021-11-21 00:18:43,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:43,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:43,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:43,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:43,353 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:18:43,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:18:43,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:18:44,863 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:18:44,878 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:18:46,137 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:18:46,137 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:18:46,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 67 [2021-11-21 00:18:46,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420346788] [2021-11-21 00:18:46,137 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:18:46,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-21 00:18:46,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:46,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-21 00:18:46,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=5986, Unknown=1, NotChecked=156, Total=6480 [2021-11-21 00:18:46,139 INFO L87 Difference]: Start difference. First operand 114 states and 118 transitions. Second operand has 67 states, 66 states have (on average 2.1515151515151514) internal successors, (142), 63 states have internal predecessors, (142), 29 states have call successors, (30), 2 states have call predecessors, (30), 3 states have return successors, (31), 31 states have call predecessors, (31), 29 states have call successors, (31) [2021-11-21 00:18:48,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:18:48,505 INFO L93 Difference]: Finished difference Result 127 states and 130 transitions. [2021-11-21 00:18:48,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-21 00:18:48,505 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 2.1515151515151514) internal successors, (142), 63 states have internal predecessors, (142), 29 states have call successors, (30), 2 states have call predecessors, (30), 3 states have return successors, (31), 31 states have call predecessors, (31), 29 states have call successors, (31) Word has length 119 [2021-11-21 00:18:48,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:18:48,506 INFO L225 Difference]: With dead ends: 127 [2021-11-21 00:18:48,506 INFO L226 Difference]: Without dead ends: 125 [2021-11-21 00:18:48,507 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 247 SyntacticMatches, 2 SemanticMatches, 111 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 3430 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=827, Invalid=11608, Unknown=1, NotChecked=220, Total=12656 [2021-11-21 00:18:48,507 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 143 mSDsluCounter, 1008 mSDsCounter, 0 mSdLazyCounter, 3199 mSolverCounterSat, 200 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 987 SdHoareTripleChecker+Invalid, 3498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 200 IncrementalHoareTripleChecker+Valid, 3199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 99 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:18:48,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [144 Valid, 987 Invalid, 3498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [200 Valid, 3199 Invalid, 0 Unknown, 99 Unchecked, 1.4s Time] [2021-11-21 00:18:48,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-21 00:18:48,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 119. [2021-11-21 00:18:48,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 88 states have (on average 1.0227272727272727) internal successors, (90), 88 states have internal predecessors, (90), 16 states have call successors, (16), 14 states have call predecessors, (16), 14 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-21 00:18:48,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 122 transitions. [2021-11-21 00:18:48,533 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 122 transitions. Word has length 119 [2021-11-21 00:18:48,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:18:48,533 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 122 transitions. [2021-11-21 00:18:48,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 2.1515151515151514) internal successors, (142), 63 states have internal predecessors, (142), 29 states have call successors, (30), 2 states have call predecessors, (30), 3 states have return successors, (31), 31 states have call predecessors, (31), 29 states have call successors, (31) [2021-11-21 00:18:48,533 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 122 transitions. [2021-11-21 00:18:48,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-21 00:18:48,534 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:18:48,534 INFO L514 BasicCegarLoop]: trace histogram [16, 14, 14, 14, 14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:18:48,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-21 00:18:48,734 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-21 00:18:48,735 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:18:48,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:18:48,735 INFO L85 PathProgramCache]: Analyzing trace with hash -1424349019, now seen corresponding path program 37 times [2021-11-21 00:18:48,735 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:18:48,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892318316] [2021-11-21 00:18:48,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:18:48,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:18:48,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:49,423 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 15 proven. 560 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2021-11-21 00:18:49,423 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:18:49,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892318316] [2021-11-21 00:18:49,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892318316] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:18:49,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [155054291] [2021-11-21 00:18:49,423 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:18:49,423 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:18:49,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:18:49,424 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:18:49,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-21 00:18:49,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:18:49,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-21 00:18:49,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:18:50,466 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 29 treesize of output 25 [2021-11-21 00:18:51,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:18:51,464 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 15 proven. 560 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2021-11-21 00:18:51,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:18:51,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:18:51,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:18:52,059 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 15 proven. 560 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2021-11-21 00:18:52,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [155054291] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:18:52,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [427404355] [2021-11-21 00:18:52,061 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:18:52,061 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:18:52,061 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:18:52,061 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:18:52,061 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:18:52,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:52,291 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:18:52,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:18:52,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:52,339 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:18:52,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:18:53,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:53,227 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 31 treesize of output 33 [2021-11-21 00:18:54,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:54,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:54,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:54,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:18:54,431 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:18:54,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:18:55,028 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 20 treesize of output 16 [2021-11-21 00:18:56,127 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:18:56,142 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:18:57,438 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:18:57,439 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:18:57,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2021-11-21 00:18:57,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492053224] [2021-11-21 00:18:57,439 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:18:57,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-21 00:18:57,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:18:57,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-21 00:18:57,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=6033, Unknown=0, NotChecked=0, Total=6320 [2021-11-21 00:18:57,441 INFO L87 Difference]: Start difference. First operand 119 states and 122 transitions. Second operand has 68 states, 67 states have (on average 2.2686567164179103) internal successors, (152), 64 states have internal predecessors, (152), 29 states have call successors, (30), 1 states have call predecessors, (30), 2 states have return successors, (31), 31 states have call predecessors, (31), 29 states have call successors, (31) [2021-11-21 00:19:00,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:19:00,828 INFO L93 Difference]: Finished difference Result 180 states and 186 transitions. [2021-11-21 00:19:00,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-21 00:19:00,829 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 2.2686567164179103) internal successors, (152), 64 states have internal predecessors, (152), 29 states have call successors, (30), 1 states have call predecessors, (30), 2 states have return successors, (31), 31 states have call predecessors, (31), 29 states have call successors, (31) Word has length 122 [2021-11-21 00:19:00,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:19:00,830 INFO L225 Difference]: With dead ends: 180 [2021-11-21 00:19:00,830 INFO L226 Difference]: Without dead ends: 178 [2021-11-21 00:19:00,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 319 SyntacticMatches, 3 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4356 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=816, Invalid=14934, Unknown=0, NotChecked=0, Total=15750 [2021-11-21 00:19:00,832 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 162 mSDsluCounter, 1189 mSDsCounter, 0 mSdLazyCounter, 3684 mSolverCounterSat, 295 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 1197 SdHoareTripleChecker+Invalid, 3979 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 295 IncrementalHoareTripleChecker+Valid, 3684 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:19:00,832 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [164 Valid, 1197 Invalid, 3979 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [295 Valid, 3684 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-21 00:19:00,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-11-21 00:19:00,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 125. [2021-11-21 00:19:00,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 93 states have (on average 1.032258064516129) internal successors, (96), 93 states have internal predecessors, (96), 17 states have call successors, (17), 14 states have call predecessors, (17), 14 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-21 00:19:00,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 130 transitions. [2021-11-21 00:19:00,872 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 130 transitions. Word has length 122 [2021-11-21 00:19:00,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:19:00,873 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 130 transitions. [2021-11-21 00:19:00,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 67 states have (on average 2.2686567164179103) internal successors, (152), 64 states have internal predecessors, (152), 29 states have call successors, (30), 1 states have call predecessors, (30), 2 states have return successors, (31), 31 states have call predecessors, (31), 29 states have call successors, (31) [2021-11-21 00:19:00,873 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 130 transitions. [2021-11-21 00:19:00,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-21 00:19:00,874 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:19:00,874 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:19:00,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-21 00:19:01,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-21 00:19:01,085 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:19:01,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:19:01,085 INFO L85 PathProgramCache]: Analyzing trace with hash 1500770883, now seen corresponding path program 38 times [2021-11-21 00:19:01,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:19:01,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47661100] [2021-11-21 00:19:01,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:19:01,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:19:01,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:19:01,528 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 261 proven. 327 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2021-11-21 00:19:01,528 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:19:01,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47661100] [2021-11-21 00:19:01,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47661100] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:19:01,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013802115] [2021-11-21 00:19:01,528 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:19:01,528 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:19:01,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:19:01,530 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:19:01,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-21 00:19:02,144 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-21 00:19:02,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:19:02,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 432 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-21 00:19:02,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:19:02,842 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 301 proven. 287 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2021-11-21 00:19:02,843 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:19:03,111 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 301 proven. 287 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2021-11-21 00:19:03,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2013802115] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:19:03,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [814825825] [2021-11-21 00:19:03,112 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:19:03,112 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:19:03,112 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:19:03,113 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:19:03,113 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:19:03,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:03,334 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:19:03,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:19:03,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:03,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:19:04,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:04,163 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 31 treesize of output 33 [2021-11-21 00:19:05,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:05,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:05,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:05,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:05,353 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:19:05,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:19:06,018 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 20 treesize of output 16 [2021-11-21 00:19:07,051 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:19:07,065 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:19:07,952 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:19:07,952 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:19:07,952 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2021-11-21 00:19:07,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872433455] [2021-11-21 00:19:07,952 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:19:07,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-21 00:19:07,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:19:07,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-21 00:19:07,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=602, Invalid=3058, Unknown=0, NotChecked=0, Total=3660 [2021-11-21 00:19:07,954 INFO L87 Difference]: Start difference. First operand 125 states and 130 transitions. Second operand has 49 states, 49 states have (on average 2.63265306122449) internal successors, (129), 49 states have internal predecessors, (129), 16 states have call successors, (17), 1 states have call predecessors, (17), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) [2021-11-21 00:19:08,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:19:08,386 INFO L93 Difference]: Finished difference Result 183 states and 189 transitions. [2021-11-21 00:19:08,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-21 00:19:08,390 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.63265306122449) internal successors, (129), 49 states have internal predecessors, (129), 16 states have call successors, (17), 1 states have call predecessors, (17), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) Word has length 125 [2021-11-21 00:19:08,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:19:08,392 INFO L225 Difference]: With dead ends: 183 [2021-11-21 00:19:08,392 INFO L226 Difference]: Without dead ends: 135 [2021-11-21 00:19:08,393 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 346 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1690 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=973, Invalid=4577, Unknown=0, NotChecked=0, Total=5550 [2021-11-21 00:19:08,393 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 147 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 392 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 486 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:19:08,394 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 201 Invalid, 486 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 392 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:19:08,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-21 00:19:08,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 122. [2021-11-21 00:19:08,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 90 states have (on average 1.0222222222222221) internal successors, (92), 90 states have internal predecessors, (92), 17 states have call successors, (17), 14 states have call predecessors, (17), 14 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-21 00:19:08,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 126 transitions. [2021-11-21 00:19:08,437 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 126 transitions. Word has length 125 [2021-11-21 00:19:08,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:19:08,437 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 126 transitions. [2021-11-21 00:19:08,437 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.63265306122449) internal successors, (129), 49 states have internal predecessors, (129), 16 states have call successors, (17), 1 states have call predecessors, (17), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) [2021-11-21 00:19:08,438 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 126 transitions. [2021-11-21 00:19:08,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-21 00:19:08,438 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:19:08,439 INFO L514 BasicCegarLoop]: trace histogram [17, 15, 15, 15, 15, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:19:08,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-21 00:19:08,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:19:08,653 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:19:08,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:19:08,653 INFO L85 PathProgramCache]: Analyzing trace with hash 91172452, now seen corresponding path program 39 times [2021-11-21 00:19:08,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:19:08,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001767047] [2021-11-21 00:19:08,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:19:08,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:19:08,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:19:09,539 INFO L134 CoverageAnalysis]: Checked inductivity of 862 backedges. 15 proven. 605 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-21 00:19:09,540 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:19:09,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001767047] [2021-11-21 00:19:09,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1001767047] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:19:09,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [623074892] [2021-11-21 00:19:09,540 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:19:09,540 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:19:09,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:19:09,541 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:19:09,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-21 00:19:09,690 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:19:09,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:19:09,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-21 00:19:09,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:19:10,679 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 23 treesize of output 19 [2021-11-21 00:19:10,909 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:19:10,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:19:11,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:19:11,907 INFO L134 CoverageAnalysis]: Checked inductivity of 862 backedges. 45 proven. 605 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2021-11-21 00:19:11,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:19:24,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [623074892] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:19:24,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1666224643] [2021-11-21 00:19:24,279 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:19:24,279 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:19:24,280 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:19:24,280 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:19:24,280 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:19:24,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:24,487 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:19:24,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:19:24,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:24,543 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:19:24,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:19:25,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:25,315 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 35 treesize of output 37 [2021-11-21 00:19:27,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:27,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:27,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:27,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:27,145 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:19:27,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:19:27,505 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 20 treesize of output 16 [2021-11-21 00:19:28,573 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:19:28,587 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:19:29,907 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:19:29,907 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:19:29,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 72 [2021-11-21 00:19:29,907 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220774368] [2021-11-21 00:19:29,907 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:19:29,907 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-21 00:19:29,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:19:29,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-21 00:19:29,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=377, Invalid=6927, Unknown=6, NotChecked=0, Total=7310 [2021-11-21 00:19:29,908 INFO L87 Difference]: Start difference. First operand 122 states and 126 transitions. Second operand has 72 states, 70 states have (on average 2.1714285714285713) internal successors, (152), 68 states have internal predecessors, (152), 31 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (33), 33 states have call predecessors, (33), 31 states have call successors, (33) [2021-11-21 00:19:32,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:19:32,396 INFO L93 Difference]: Finished difference Result 135 states and 138 transitions. [2021-11-21 00:19:32,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-21 00:19:32,397 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 70 states have (on average 2.1714285714285713) internal successors, (152), 68 states have internal predecessors, (152), 31 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (33), 33 states have call predecessors, (33), 31 states have call successors, (33) Word has length 127 [2021-11-21 00:19:32,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:19:32,398 INFO L225 Difference]: With dead ends: 135 [2021-11-21 00:19:32,398 INFO L226 Difference]: Without dead ends: 133 [2021-11-21 00:19:32,398 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 251 SyntacticMatches, 2 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3975 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=942, Invalid=13332, Unknown=6, NotChecked=0, Total=14280 [2021-11-21 00:19:32,399 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 126 mSDsluCounter, 1265 mSDsCounter, 0 mSdLazyCounter, 3292 mSolverCounterSat, 222 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 1262 SdHoareTripleChecker+Invalid, 3562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 222 IncrementalHoareTripleChecker+Valid, 3292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 48 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:19:32,399 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 1262 Invalid, 3562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [222 Valid, 3292 Invalid, 0 Unknown, 48 Unchecked, 1.4s Time] [2021-11-21 00:19:32,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-21 00:19:32,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 127. [2021-11-21 00:19:32,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 94 states have (on average 1.0212765957446808) internal successors, (96), 94 states have internal predecessors, (96), 17 states have call successors, (17), 15 states have call predecessors, (17), 15 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-21 00:19:32,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 130 transitions. [2021-11-21 00:19:32,424 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 130 transitions. Word has length 127 [2021-11-21 00:19:32,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:19:32,424 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 130 transitions. [2021-11-21 00:19:32,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 70 states have (on average 2.1714285714285713) internal successors, (152), 68 states have internal predecessors, (152), 31 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (33), 33 states have call predecessors, (33), 31 states have call successors, (33) [2021-11-21 00:19:32,425 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 130 transitions. [2021-11-21 00:19:32,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-21 00:19:32,425 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:19:32,425 INFO L514 BasicCegarLoop]: trace histogram [17, 15, 15, 15, 15, 15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:19:32,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-21 00:19:32,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-11-21 00:19:32,627 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:19:32,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:19:32,627 INFO L85 PathProgramCache]: Analyzing trace with hash 1704697892, now seen corresponding path program 40 times [2021-11-21 00:19:32,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:19:32,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346080051] [2021-11-21 00:19:32,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:19:32,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:19:32,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:19:33,517 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 16 proven. 645 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-21 00:19:33,517 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:19:33,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346080051] [2021-11-21 00:19:33,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [346080051] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:19:33,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104240827] [2021-11-21 00:19:33,517 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:19:33,517 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:19:33,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:19:33,521 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:19:33,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-21 00:19:33,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:19:33,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-21 00:19:33,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:19:34,691 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 29 treesize of output 25 [2021-11-21 00:19:35,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:19:35,770 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 16 proven. 645 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-21 00:19:35,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:19:35,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:19:35,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:19:36,446 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 16 proven. 645 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-21 00:19:36,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2104240827] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:19:36,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [95714480] [2021-11-21 00:19:36,447 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:19:36,447 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:19:36,447 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:19:36,447 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:19:36,447 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:19:36,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:36,665 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:19:36,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:19:36,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:36,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:19:37,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:37,603 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 35 treesize of output 37 [2021-11-21 00:19:39,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:39,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:39,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:39,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:39,374 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:19:39,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:19:39,820 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 20 treesize of output 16 [2021-11-21 00:19:40,842 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:19:40,859 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:19:42,172 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:19:42,172 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:19:42,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 72 [2021-11-21 00:19:42,173 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699750974] [2021-11-21 00:19:42,173 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:19:42,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-21 00:19:42,173 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:19:42,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-21 00:19:42,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=6670, Unknown=0, NotChecked=0, Total=6972 [2021-11-21 00:19:42,174 INFO L87 Difference]: Start difference. First operand 127 states and 130 transitions. Second operand has 72 states, 71 states have (on average 2.2816901408450705) internal successors, (162), 68 states have internal predecessors, (162), 31 states have call successors, (32), 1 states have call predecessors, (32), 2 states have return successors, (33), 33 states have call predecessors, (33), 31 states have call successors, (33) [2021-11-21 00:19:45,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:19:45,477 INFO L93 Difference]: Finished difference Result 191 states and 197 transitions. [2021-11-21 00:19:45,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-21 00:19:45,478 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 71 states have (on average 2.2816901408450705) internal successors, (162), 68 states have internal predecessors, (162), 31 states have call successors, (32), 1 states have call predecessors, (32), 2 states have return successors, (33), 33 states have call predecessors, (33), 31 states have call successors, (33) Word has length 130 [2021-11-21 00:19:45,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:19:45,479 INFO L225 Difference]: With dead ends: 191 [2021-11-21 00:19:45,479 INFO L226 Difference]: Without dead ends: 189 [2021-11-21 00:19:45,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 341 SyntacticMatches, 3 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4873 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=866, Invalid=16690, Unknown=0, NotChecked=0, Total=17556 [2021-11-21 00:19:45,481 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 164 mSDsluCounter, 1534 mSDsCounter, 0 mSdLazyCounter, 4346 mSolverCounterSat, 284 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 1533 SdHoareTripleChecker+Invalid, 4630 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 284 IncrementalHoareTripleChecker+Valid, 4346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:19:45,482 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 1533 Invalid, 4630 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [284 Valid, 4346 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-21 00:19:45,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-11-21 00:19:45,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 133. [2021-11-21 00:19:45,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 99 states have (on average 1.0303030303030303) internal successors, (102), 99 states have internal predecessors, (102), 18 states have call successors, (18), 15 states have call predecessors, (18), 15 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-21 00:19:45,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 138 transitions. [2021-11-21 00:19:45,519 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 138 transitions. Word has length 130 [2021-11-21 00:19:45,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:19:45,519 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 138 transitions. [2021-11-21 00:19:45,519 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 71 states have (on average 2.2816901408450705) internal successors, (162), 68 states have internal predecessors, (162), 31 states have call successors, (32), 1 states have call predecessors, (32), 2 states have return successors, (33), 33 states have call predecessors, (33), 31 states have call successors, (33) [2021-11-21 00:19:45,519 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 138 transitions. [2021-11-21 00:19:45,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-21 00:19:45,520 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:19:45,520 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:19:45,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-21 00:19:45,723 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-21 00:19:45,723 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:19:45,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:19:45,723 INFO L85 PathProgramCache]: Analyzing trace with hash 967104100, now seen corresponding path program 41 times [2021-11-21 00:19:45,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:19:45,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [739763335] [2021-11-21 00:19:45,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:19:45,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:19:45,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:19:46,214 INFO L134 CoverageAnalysis]: Checked inductivity of 947 backedges. 302 proven. 373 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-11-21 00:19:46,214 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:19:46,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [739763335] [2021-11-21 00:19:46,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [739763335] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:19:46,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793399744] [2021-11-21 00:19:46,215 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:19:46,215 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:19:46,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:19:46,216 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:19:46,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-21 00:19:47,145 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-21 00:19:47,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:19:47,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-21 00:19:47,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:19:47,977 INFO L134 CoverageAnalysis]: Checked inductivity of 947 backedges. 345 proven. 330 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-11-21 00:19:47,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:19:48,257 INFO L134 CoverageAnalysis]: Checked inductivity of 947 backedges. 345 proven. 330 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-11-21 00:19:48,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1793399744] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:19:48,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1857177928] [2021-11-21 00:19:48,258 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:19:48,258 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:19:48,259 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:19:48,259 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:19:48,259 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:19:48,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:48,522 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:19:48,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:19:48,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:48,563 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:19:48,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:19:49,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:49,397 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 31 treesize of output 33 [2021-11-21 00:19:50,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:50,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:50,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:50,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:19:50,530 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:19:50,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:19:51,061 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 20 treesize of output 16 [2021-11-21 00:19:52,058 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:19:52,072 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:19:53,011 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:19:53,012 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:19:53,012 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2021-11-21 00:19:53,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852837223] [2021-11-21 00:19:53,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:19:53,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-21 00:19:53,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:19:53,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-21 00:19:53,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=671, Invalid=3361, Unknown=0, NotChecked=0, Total=4032 [2021-11-21 00:19:53,013 INFO L87 Difference]: Start difference. First operand 133 states and 138 transitions. Second operand has 52 states, 52 states have (on average 2.6346153846153846) internal successors, (137), 52 states have internal predecessors, (137), 17 states have call successors, (18), 1 states have call predecessors, (18), 1 states have return successors, (18), 17 states have call predecessors, (18), 17 states have call successors, (18) [2021-11-21 00:19:53,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:19:53,462 INFO L93 Difference]: Finished difference Result 194 states and 200 transitions. [2021-11-21 00:19:53,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-21 00:19:53,462 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.6346153846153846) internal successors, (137), 52 states have internal predecessors, (137), 17 states have call successors, (18), 1 states have call predecessors, (18), 1 states have return successors, (18), 17 states have call predecessors, (18), 17 states have call successors, (18) Word has length 133 [2021-11-21 00:19:53,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:19:53,463 INFO L225 Difference]: With dead ends: 194 [2021-11-21 00:19:53,463 INFO L226 Difference]: Without dead ends: 143 [2021-11-21 00:19:53,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 369 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1865 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1091, Invalid=5071, Unknown=0, NotChecked=0, Total=6162 [2021-11-21 00:19:53,464 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 164 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:19:53,464 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [165 Valid, 198 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 402 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:19:53,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-21 00:19:53,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 130. [2021-11-21 00:19:53,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 96 states have (on average 1.0208333333333333) internal successors, (98), 96 states have internal predecessors, (98), 18 states have call successors, (18), 15 states have call predecessors, (18), 15 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-21 00:19:53,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 134 transitions. [2021-11-21 00:19:53,498 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 134 transitions. Word has length 133 [2021-11-21 00:19:53,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:19:53,498 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 134 transitions. [2021-11-21 00:19:53,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.6346153846153846) internal successors, (137), 52 states have internal predecessors, (137), 17 states have call successors, (18), 1 states have call predecessors, (18), 1 states have return successors, (18), 17 states have call predecessors, (18), 17 states have call successors, (18) [2021-11-21 00:19:53,498 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 134 transitions. [2021-11-21 00:19:53,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-21 00:19:53,499 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:19:53,499 INFO L514 BasicCegarLoop]: trace histogram [18, 16, 16, 16, 16, 15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:19:53,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-21 00:19:53,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:19:53,709 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:19:53,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:19:53,709 INFO L85 PathProgramCache]: Analyzing trace with hash -1876265245, now seen corresponding path program 42 times [2021-11-21 00:19:53,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:19:53,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1050794926] [2021-11-21 00:19:53,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:19:53,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:19:53,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:19:54,657 INFO L134 CoverageAnalysis]: Checked inductivity of 983 backedges. 16 proven. 693 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-21 00:19:54,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:19:54,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1050794926] [2021-11-21 00:19:54,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1050794926] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:19:54,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159231860] [2021-11-21 00:19:54,657 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:19:54,657 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:19:54,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:19:54,661 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:19:54,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-21 00:19:54,886 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:19:54,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:19:54,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-21 00:19:54,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:19:56,036 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 23 treesize of output 19 [2021-11-21 00:19:56,275 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:19:56,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:19:57,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:19:57,355 INFO L134 CoverageAnalysis]: Checked inductivity of 983 backedges. 48 proven. 693 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-21 00:19:57,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:20:05,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1159231860] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:20:05,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [993898313] [2021-11-21 00:20:05,153 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:20:05,153 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:20:05,153 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:20:05,154 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:20:05,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:20:05,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:05,385 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:20:05,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:20:05,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:05,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:20:06,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:06,268 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 31 treesize of output 33 [2021-11-21 00:20:07,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:07,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:07,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:07,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:07,554 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:20:07,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:20:08,190 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 20 treesize of output 16 [2021-11-21 00:20:09,307 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:20:09,321 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:20:10,740 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:20:10,740 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:20:10,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 75 [2021-11-21 00:20:10,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562825349] [2021-11-21 00:20:10,741 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:20:10,741 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2021-11-21 00:20:10,741 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:20:10,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-11-21 00:20:10,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=391, Invalid=7438, Unknown=3, NotChecked=0, Total=7832 [2021-11-21 00:20:10,742 INFO L87 Difference]: Start difference. First operand 130 states and 134 transitions. Second operand has 75 states, 74 states have (on average 2.189189189189189) internal successors, (162), 71 states have internal predecessors, (162), 33 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (35), 35 states have call predecessors, (35), 33 states have call successors, (35) [2021-11-21 00:20:15,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:20:15,461 INFO L93 Difference]: Finished difference Result 192 states and 199 transitions. [2021-11-21 00:20:15,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-21 00:20:15,461 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 74 states have (on average 2.189189189189189) internal successors, (162), 71 states have internal predecessors, (162), 33 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (35), 35 states have call predecessors, (35), 33 states have call successors, (35) Word has length 135 [2021-11-21 00:20:15,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:20:15,463 INFO L225 Difference]: With dead ends: 192 [2021-11-21 00:20:15,463 INFO L226 Difference]: Without dead ends: 190 [2021-11-21 00:20:15,465 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 283 SyntacticMatches, 8 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7796 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=1537, Invalid=22952, Unknown=3, NotChecked=0, Total=24492 [2021-11-21 00:20:15,465 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 204 mSDsluCounter, 1643 mSDsCounter, 0 mSdLazyCounter, 4032 mSolverCounterSat, 278 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 1588 SdHoareTripleChecker+Invalid, 4459 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 278 IncrementalHoareTripleChecker+Valid, 4032 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 149 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:20:15,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 1588 Invalid, 4459 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [278 Valid, 4032 Invalid, 0 Unknown, 149 Unchecked, 1.9s Time] [2021-11-21 00:20:15,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-11-21 00:20:15,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 136. [2021-11-21 00:20:15,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 100 states have (on average 1.02) internal successors, (102), 101 states have internal predecessors, (102), 19 states have call successors, (19), 16 states have call predecessors, (19), 16 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-21 00:20:15,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 140 transitions. [2021-11-21 00:20:15,494 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 140 transitions. Word has length 135 [2021-11-21 00:20:15,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:20:15,495 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 140 transitions. [2021-11-21 00:20:15,495 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 74 states have (on average 2.189189189189189) internal successors, (162), 71 states have internal predecessors, (162), 33 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (35), 35 states have call predecessors, (35), 33 states have call successors, (35) [2021-11-21 00:20:15,495 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 140 transitions. [2021-11-21 00:20:15,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-21 00:20:15,496 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:20:15,496 INFO L514 BasicCegarLoop]: trace histogram [18, 16, 16, 16, 16, 16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:20:15,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-21 00:20:15,708 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:20:15,709 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:20:15,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:20:15,709 INFO L85 PathProgramCache]: Analyzing trace with hash -1108012219, now seen corresponding path program 43 times [2021-11-21 00:20:15,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:20:15,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989828986] [2021-11-21 00:20:15,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:20:15,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:20:15,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:20:16,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 17 proven. 736 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-21 00:20:16,799 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:20:16,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989828986] [2021-11-21 00:20:16,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [989828986] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:20:16,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1587585221] [2021-11-21 00:20:16,800 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:20:16,800 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:20:16,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:20:16,801 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:20:16,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-21 00:20:16,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:20:16,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 474 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-21 00:20:16,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:20:18,154 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 29 treesize of output 25 [2021-11-21 00:20:19,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:20:19,376 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 17 proven. 736 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-21 00:20:19,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:20:19,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:20:19,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:20:20,065 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 17 proven. 736 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-21 00:20:20,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1587585221] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:20:20,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [662232234] [2021-11-21 00:20:20,066 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:20:20,066 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:20:20,067 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:20:20,067 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:20:20,067 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:20:20,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:20,282 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:20:20,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:20:20,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:20,324 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:20:20,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:20:21,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:21,182 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 31 treesize of output 33 [2021-11-21 00:20:22,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:22,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:22,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:22,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:22,442 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:20:22,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:20:23,014 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 20 treesize of output 16 [2021-11-21 00:20:24,149 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:20:24,167 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:20:25,596 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:20:25,597 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:20:25,597 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 76 [2021-11-21 00:20:25,597 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188694625] [2021-11-21 00:20:25,597 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:20:25,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2021-11-21 00:20:25,598 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:20:25,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-11-21 00:20:25,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=7339, Unknown=0, NotChecked=0, Total=7656 [2021-11-21 00:20:25,599 INFO L87 Difference]: Start difference. First operand 136 states and 140 transitions. Second operand has 76 states, 75 states have (on average 2.2933333333333334) internal successors, (172), 72 states have internal predecessors, (172), 33 states have call successors, (34), 1 states have call predecessors, (34), 2 states have return successors, (35), 35 states have call predecessors, (35), 33 states have call successors, (35) [2021-11-21 00:20:29,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:20:29,124 INFO L93 Difference]: Finished difference Result 202 states and 208 transitions. [2021-11-21 00:20:29,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-11-21 00:20:29,130 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 75 states have (on average 2.2933333333333334) internal successors, (172), 72 states have internal predecessors, (172), 33 states have call successors, (34), 1 states have call predecessors, (34), 2 states have return successors, (35), 35 states have call predecessors, (35), 33 states have call successors, (35) Word has length 138 [2021-11-21 00:20:29,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:20:29,131 INFO L225 Difference]: With dead ends: 202 [2021-11-21 00:20:29,131 INFO L226 Difference]: Without dead ends: 200 [2021-11-21 00:20:29,132 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 363 SyntacticMatches, 3 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5419 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=916, Invalid=18544, Unknown=0, NotChecked=0, Total=19460 [2021-11-21 00:20:29,133 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 193 mSDsluCounter, 1574 mSDsCounter, 0 mSdLazyCounter, 4267 mSolverCounterSat, 359 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 1577 SdHoareTripleChecker+Invalid, 4626 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 359 IncrementalHoareTripleChecker+Valid, 4267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:20:29,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 1577 Invalid, 4626 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [359 Valid, 4267 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-21 00:20:29,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-21 00:20:29,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 141. [2021-11-21 00:20:29,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 105 states have (on average 1.0285714285714285) internal successors, (108), 105 states have internal predecessors, (108), 19 states have call successors, (19), 16 states have call predecessors, (19), 16 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-21 00:20:29,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 146 transitions. [2021-11-21 00:20:29,180 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 146 transitions. Word has length 138 [2021-11-21 00:20:29,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:20:29,180 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 146 transitions. [2021-11-21 00:20:29,181 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 75 states have (on average 2.2933333333333334) internal successors, (172), 72 states have internal predecessors, (172), 33 states have call successors, (34), 1 states have call predecessors, (34), 2 states have return successors, (35), 35 states have call predecessors, (35), 33 states have call successors, (35) [2021-11-21 00:20:29,181 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 146 transitions. [2021-11-21 00:20:29,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-21 00:20:29,181 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:20:29,181 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:20:29,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-21 00:20:29,382 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-21 00:20:29,382 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:20:29,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:20:29,382 INFO L85 PathProgramCache]: Analyzing trace with hash -1962835037, now seen corresponding path program 44 times [2021-11-21 00:20:29,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:20:29,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837036077] [2021-11-21 00:20:29,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:20:29,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:20:29,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:20:29,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 346 proven. 422 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2021-11-21 00:20:29,890 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:20:29,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837036077] [2021-11-21 00:20:29,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1837036077] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:20:29,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580853488] [2021-11-21 00:20:29,891 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:20:29,891 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:20:29,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:20:29,892 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:20:29,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-21 00:20:30,701 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-21 00:20:30,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:20:30,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-21 00:20:30,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:20:31,528 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 392 proven. 376 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2021-11-21 00:20:31,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:20:31,870 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 392 proven. 376 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2021-11-21 00:20:31,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580853488] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:20:31,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [850442504] [2021-11-21 00:20:31,871 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:20:31,871 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:20:31,871 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:20:31,871 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:20:31,872 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:20:32,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:32,083 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:20:32,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:20:32,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:32,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:20:32,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:32,921 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 31 treesize of output 33 [2021-11-21 00:20:34,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:34,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:34,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:34,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:34,049 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:20:34,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:20:34,601 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 20 treesize of output 16 [2021-11-21 00:20:35,531 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:20:35,546 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:20:36,501 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:20:36,501 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:20:36,501 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 55 [2021-11-21 00:20:36,501 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394866125] [2021-11-21 00:20:36,501 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:20:36,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-21 00:20:36,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:20:36,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-21 00:20:36,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=744, Invalid=3678, Unknown=0, NotChecked=0, Total=4422 [2021-11-21 00:20:36,503 INFO L87 Difference]: Start difference. First operand 141 states and 146 transitions. Second operand has 55 states, 55 states have (on average 2.6363636363636362) internal successors, (145), 55 states have internal predecessors, (145), 18 states have call successors, (19), 1 states have call predecessors, (19), 1 states have return successors, (19), 18 states have call predecessors, (19), 18 states have call successors, (19) [2021-11-21 00:20:36,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:20:36,981 INFO L93 Difference]: Finished difference Result 205 states and 211 transitions. [2021-11-21 00:20:36,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-21 00:20:36,982 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.6363636363636362) internal successors, (145), 55 states have internal predecessors, (145), 18 states have call successors, (19), 1 states have call predecessors, (19), 1 states have return successors, (19), 18 states have call predecessors, (19), 18 states have call successors, (19) Word has length 141 [2021-11-21 00:20:36,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:20:36,983 INFO L225 Difference]: With dead ends: 205 [2021-11-21 00:20:36,984 INFO L226 Difference]: Without dead ends: 151 [2021-11-21 00:20:36,985 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 392 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2048 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1216, Invalid=5590, Unknown=0, NotChecked=0, Total=6806 [2021-11-21 00:20:36,985 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 177 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 372 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 372 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:20:36,985 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 205 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 372 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:20:36,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-21 00:20:37,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 138. [2021-11-21 00:20:37,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 102 states have (on average 1.0196078431372548) internal successors, (104), 102 states have internal predecessors, (104), 19 states have call successors, (19), 16 states have call predecessors, (19), 16 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-21 00:20:37,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 142 transitions. [2021-11-21 00:20:37,032 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 142 transitions. Word has length 141 [2021-11-21 00:20:37,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:20:37,033 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 142 transitions. [2021-11-21 00:20:37,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.6363636363636362) internal successors, (145), 55 states have internal predecessors, (145), 18 states have call successors, (19), 1 states have call predecessors, (19), 1 states have return successors, (19), 18 states have call predecessors, (19), 18 states have call successors, (19) [2021-11-21 00:20:37,033 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 142 transitions. [2021-11-21 00:20:37,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:20:37,034 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:20:37,034 INFO L514 BasicCegarLoop]: trace histogram [19, 17, 17, 17, 17, 16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:20:37,073 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-21 00:20:37,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:20:37,261 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:20:37,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:20:37,261 INFO L85 PathProgramCache]: Analyzing trace with hash 1314700036, now seen corresponding path program 45 times [2021-11-21 00:20:37,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:20:37,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900708616] [2021-11-21 00:20:37,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:20:37,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:20:37,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:20:38,348 INFO L134 CoverageAnalysis]: Checked inductivity of 1112 backedges. 17 proven. 787 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-21 00:20:38,348 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:20:38,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900708616] [2021-11-21 00:20:38,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [900708616] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:20:38,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752474818] [2021-11-21 00:20:38,348 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:20:38,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:20:38,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:20:38,349 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:20:38,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-21 00:20:38,744 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:20:38,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:20:38,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-21 00:20:38,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:20:39,893 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 23 treesize of output 19 [2021-11-21 00:20:40,141 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:20:40,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:20:41,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:20:41,327 INFO L134 CoverageAnalysis]: Checked inductivity of 1112 backedges. 51 proven. 787 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-21 00:20:41,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:20:57,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [752474818] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:20:57,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1396878997] [2021-11-21 00:20:57,698 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:20:57,698 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:20:57,699 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:20:57,699 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:20:57,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:20:57,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:57,921 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:20:57,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:20:57,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:57,964 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:20:57,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:20:58,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:20:58,864 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 31 treesize of output 33 [2021-11-21 00:21:00,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:00,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:00,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:00,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:00,028 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:21:00,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:21:00,697 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 20 treesize of output 16 [2021-11-21 00:21:01,767 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:21:01,783 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:21:03,246 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:21:03,246 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:21:03,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 79 [2021-11-21 00:21:03,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612913874] [2021-11-21 00:21:03,246 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:21:03,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-21 00:21:03,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:03,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-21 00:21:03,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=410, Invalid=8138, Unknown=8, NotChecked=0, Total=8556 [2021-11-21 00:21:03,247 INFO L87 Difference]: Start difference. First operand 138 states and 142 transitions. Second operand has 79 states, 78 states have (on average 2.2051282051282053) internal successors, (172), 75 states have internal predecessors, (172), 35 states have call successors, (36), 2 states have call predecessors, (36), 3 states have return successors, (37), 37 states have call predecessors, (37), 35 states have call successors, (37) [2021-11-21 00:21:06,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:06,447 INFO L93 Difference]: Finished difference Result 151 states and 154 transitions. [2021-11-21 00:21:06,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-21 00:21:06,448 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 78 states have (on average 2.2051282051282053) internal successors, (172), 75 states have internal predecessors, (172), 35 states have call successors, (36), 2 states have call predecessors, (36), 3 states have return successors, (37), 37 states have call predecessors, (37), 35 states have call successors, (37) Word has length 143 [2021-11-21 00:21:06,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:06,449 INFO L225 Difference]: With dead ends: 151 [2021-11-21 00:21:06,449 INFO L226 Difference]: Without dead ends: 149 [2021-11-21 00:21:06,450 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 431 GetRequests, 300 SyntacticMatches, 2 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4727 ImplicationChecksByTransitivity, 21.5s TimeCoverageRelationStatistics Valid=1035, Invalid=15987, Unknown=8, NotChecked=0, Total=17030 [2021-11-21 00:21:06,451 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 160 mSDsluCounter, 1486 mSDsCounter, 0 mSdLazyCounter, 4351 mSolverCounterSat, 234 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 1491 SdHoareTripleChecker+Invalid, 4671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 234 IncrementalHoareTripleChecker+Valid, 4351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 86 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:06,451 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 1491 Invalid, 4671 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [234 Valid, 4351 Invalid, 0 Unknown, 86 Unchecked, 1.9s Time] [2021-11-21 00:21:06,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-21 00:21:06,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 143. [2021-11-21 00:21:06,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 106 states have (on average 1.0188679245283019) internal successors, (108), 106 states have internal predecessors, (108), 19 states have call successors, (19), 17 states have call predecessors, (19), 17 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-21 00:21:06,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 146 transitions. [2021-11-21 00:21:06,484 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 146 transitions. Word has length 143 [2021-11-21 00:21:06,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:06,484 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 146 transitions. [2021-11-21 00:21:06,484 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 78 states have (on average 2.2051282051282053) internal successors, (172), 75 states have internal predecessors, (172), 35 states have call successors, (36), 2 states have call predecessors, (36), 3 states have return successors, (37), 37 states have call predecessors, (37), 35 states have call successors, (37) [2021-11-21 00:21:06,484 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 146 transitions. [2021-11-21 00:21:06,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-21 00:21:06,485 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:06,485 INFO L514 BasicCegarLoop]: trace histogram [19, 17, 17, 17, 17, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:06,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-21 00:21:06,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-21 00:21:06,689 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:06,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:06,689 INFO L85 PathProgramCache]: Analyzing trace with hash 427511684, now seen corresponding path program 46 times [2021-11-21 00:21:06,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:06,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971063283] [2021-11-21 00:21:06,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:06,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:06,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:07,623 INFO L134 CoverageAnalysis]: Checked inductivity of 1159 backedges. 18 proven. 833 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-21 00:21:07,623 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:07,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971063283] [2021-11-21 00:21:07,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [971063283] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:21:07,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1788444784] [2021-11-21 00:21:07,623 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:21:07,624 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:07,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:07,624 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:21:07,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-21 00:21:07,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:07,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 500 conjuncts, 83 conjunts are in the unsatisfiable core [2021-11-21 00:21:07,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:21:08,980 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 29 treesize of output 25 [2021-11-21 00:21:10,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:21:10,258 INFO L134 CoverageAnalysis]: Checked inductivity of 1159 backedges. 18 proven. 833 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-21 00:21:10,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:21:10,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:21:10,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:21:10,957 INFO L134 CoverageAnalysis]: Checked inductivity of 1159 backedges. 18 proven. 833 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-21 00:21:10,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1788444784] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:21:10,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [591455812] [2021-11-21 00:21:10,958 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:21:10,958 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:21:10,958 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:21:10,959 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:21:10,959 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:21:11,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:11,174 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:21:11,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:21:11,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:11,227 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:21:11,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:21:12,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:12,034 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 35 treesize of output 37 [2021-11-21 00:21:13,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:13,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:13,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:13,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:14,002 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:21:14,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:21:14,410 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 20 treesize of output 16 [2021-11-21 00:21:15,501 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:21:15,517 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:21:16,999 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:21:16,999 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:21:17,000 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2021-11-21 00:21:17,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966124010] [2021-11-21 00:21:17,000 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:21:17,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-21 00:21:17,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:17,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-21 00:21:17,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=332, Invalid=8040, Unknown=0, NotChecked=0, Total=8372 [2021-11-21 00:21:17,002 INFO L87 Difference]: Start difference. First operand 143 states and 146 transitions. Second operand has 80 states, 79 states have (on average 2.3037974683544302) internal successors, (182), 76 states have internal predecessors, (182), 35 states have call successors, (36), 1 states have call predecessors, (36), 2 states have return successors, (37), 37 states have call predecessors, (37), 35 states have call successors, (37) [2021-11-21 00:21:20,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:20,976 INFO L93 Difference]: Finished difference Result 213 states and 219 transitions. [2021-11-21 00:21:20,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-21 00:21:20,976 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 79 states have (on average 2.3037974683544302) internal successors, (182), 76 states have internal predecessors, (182), 35 states have call successors, (36), 1 states have call predecessors, (36), 2 states have return successors, (37), 37 states have call predecessors, (37), 35 states have call successors, (37) Word has length 146 [2021-11-21 00:21:20,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:20,978 INFO L225 Difference]: With dead ends: 213 [2021-11-21 00:21:20,978 INFO L226 Difference]: Without dead ends: 211 [2021-11-21 00:21:20,979 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 533 GetRequests, 385 SyntacticMatches, 3 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5994 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=966, Invalid=20496, Unknown=0, NotChecked=0, Total=21462 [2021-11-21 00:21:20,979 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 184 mSDsluCounter, 1703 mSDsCounter, 0 mSdLazyCounter, 4996 mSolverCounterSat, 361 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 1706 SdHoareTripleChecker+Invalid, 5357 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 361 IncrementalHoareTripleChecker+Valid, 4996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:20,979 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 1706 Invalid, 5357 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [361 Valid, 4996 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-21 00:21:20,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-11-21 00:21:21,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 149. [2021-11-21 00:21:21,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 111 states have (on average 1.027027027027027) internal successors, (114), 111 states have internal predecessors, (114), 20 states have call successors, (20), 17 states have call predecessors, (20), 17 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 00:21:21,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 154 transitions. [2021-11-21 00:21:21,018 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 154 transitions. Word has length 146 [2021-11-21 00:21:21,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:21,018 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 154 transitions. [2021-11-21 00:21:21,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 79 states have (on average 2.3037974683544302) internal successors, (182), 76 states have internal predecessors, (182), 35 states have call successors, (36), 1 states have call predecessors, (36), 2 states have return successors, (37), 37 states have call predecessors, (37), 35 states have call successors, (37) [2021-11-21 00:21:21,018 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 154 transitions. [2021-11-21 00:21:21,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-21 00:21:21,019 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:21,019 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:21,040 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-21 00:21:21,219 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-21 00:21:21,219 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:21,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:21,220 INFO L85 PathProgramCache]: Analyzing trace with hash 1428056836, now seen corresponding path program 47 times [2021-11-21 00:21:21,220 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:21,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919365407] [2021-11-21 00:21:21,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:21,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:21,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:21,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 393 proven. 474 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-21 00:21:21,742 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:21,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919365407] [2021-11-21 00:21:21,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919365407] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:21:21,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1518508643] [2021-11-21 00:21:21,743 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:21:21,743 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:21,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:21,744 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:21:21,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-21 00:21:23,069 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2021-11-21 00:21:23,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:21:23,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 510 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-21 00:21:23,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:21:23,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 442 proven. 425 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-21 00:21:23,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:21:24,294 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 442 proven. 425 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-21 00:21:24,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1518508643] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:21:24,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1111758897] [2021-11-21 00:21:24,295 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:21:24,295 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:21:24,295 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:21:24,295 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:21:24,296 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:21:24,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:24,526 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:21:24,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:21:24,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:24,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:21:25,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:25,359 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 35 treesize of output 37 [2021-11-21 00:21:27,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:27,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:27,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:27,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:27,297 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:21:27,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:21:27,747 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 20 treesize of output 16 [2021-11-21 00:21:28,812 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:21:28,830 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:21:29,839 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:21:29,839 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:21:29,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 58 [2021-11-21 00:21:29,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124336190] [2021-11-21 00:21:29,840 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:21:29,840 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-21 00:21:29,840 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:29,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-21 00:21:29,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=821, Invalid=4009, Unknown=0, NotChecked=0, Total=4830 [2021-11-21 00:21:29,841 INFO L87 Difference]: Start difference. First operand 149 states and 154 transitions. Second operand has 58 states, 58 states have (on average 2.6379310344827585) internal successors, (153), 58 states have internal predecessors, (153), 19 states have call successors, (20), 1 states have call predecessors, (20), 1 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2021-11-21 00:21:30,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:30,392 INFO L93 Difference]: Finished difference Result 216 states and 222 transitions. [2021-11-21 00:21:30,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-21 00:21:30,392 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.6379310344827585) internal successors, (153), 58 states have internal predecessors, (153), 19 states have call successors, (20), 1 states have call predecessors, (20), 1 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) Word has length 149 [2021-11-21 00:21:30,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:30,393 INFO L225 Difference]: With dead ends: 216 [2021-11-21 00:21:30,393 INFO L226 Difference]: Without dead ends: 159 [2021-11-21 00:21:30,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 415 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2239 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1348, Invalid=6134, Unknown=0, NotChecked=0, Total=7482 [2021-11-21 00:21:30,395 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 206 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:30,395 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 240 Invalid, 606 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 478 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:21:30,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-11-21 00:21:30,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 146. [2021-11-21 00:21:30,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 108 states have (on average 1.0185185185185186) internal successors, (110), 108 states have internal predecessors, (110), 20 states have call successors, (20), 17 states have call predecessors, (20), 17 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 00:21:30,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 150 transitions. [2021-11-21 00:21:30,447 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 150 transitions. Word has length 149 [2021-11-21 00:21:30,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:30,448 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 150 transitions. [2021-11-21 00:21:30,448 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.6379310344827585) internal successors, (153), 58 states have internal predecessors, (153), 19 states have call successors, (20), 1 states have call predecessors, (20), 1 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2021-11-21 00:21:30,448 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 150 transitions. [2021-11-21 00:21:30,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-21 00:21:30,449 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:30,449 INFO L514 BasicCegarLoop]: trace histogram [20, 18, 18, 18, 18, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:30,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-21 00:21:30,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-21 00:21:30,651 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:30,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:30,651 INFO L85 PathProgramCache]: Analyzing trace with hash -1772435389, now seen corresponding path program 48 times [2021-11-21 00:21:30,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:30,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297094451] [2021-11-21 00:21:30,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:30,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:30,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:31,829 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 18 proven. 887 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-21 00:21:31,829 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:31,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297094451] [2021-11-21 00:21:31,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [297094451] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:21:31,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1127459673] [2021-11-21 00:21:31,829 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:21:31,829 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:31,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:31,831 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:21:31,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-21 00:21:32,140 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:21:32,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:21:32,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-21 00:21:32,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:21:33,585 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 23 treesize of output 19 [2021-11-21 00:21:33,842 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:21:33,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:21:35,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:21:35,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 54 proven. 887 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-21 00:21:35,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:21:45,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1127459673] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:21:45,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1190679484] [2021-11-21 00:21:45,578 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:21:45,578 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:21:45,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:21:45,578 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:21:45,579 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:21:45,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:45,806 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:21:45,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:21:45,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:45,850 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:21:45,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:21:46,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:46,849 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 31 treesize of output 33 [2021-11-21 00:21:48,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:48,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:48,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:48,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:48,165 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:21:48,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:21:48,744 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 20 treesize of output 16 [2021-11-21 00:21:49,860 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:21:49,875 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:21:51,407 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:21:51,407 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:21:51,408 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 83 [2021-11-21 00:21:51,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902348740] [2021-11-21 00:21:51,408 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:21:51,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-21 00:21:51,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:51,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-21 00:21:51,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=429, Invalid=8878, Unknown=5, NotChecked=0, Total=9312 [2021-11-21 00:21:51,409 INFO L87 Difference]: Start difference. First operand 146 states and 150 transitions. Second operand has 83 states, 82 states have (on average 2.2195121951219514) internal successors, (182), 79 states have internal predecessors, (182), 37 states have call successors, (38), 2 states have call predecessors, (38), 3 states have return successors, (39), 39 states have call predecessors, (39), 37 states have call successors, (39) [2021-11-21 00:21:56,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:56,503 INFO L93 Difference]: Finished difference Result 266 states and 275 transitions. [2021-11-21 00:21:56,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-11-21 00:21:56,503 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 82 states have (on average 2.2195121951219514) internal successors, (182), 79 states have internal predecessors, (182), 37 states have call successors, (38), 2 states have call predecessors, (38), 3 states have return successors, (39), 39 states have call predecessors, (39), 37 states have call successors, (39) Word has length 151 [2021-11-21 00:21:56,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:56,505 INFO L225 Difference]: With dead ends: 266 [2021-11-21 00:21:56,505 INFO L226 Difference]: Without dead ends: 264 [2021-11-21 00:21:56,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 319 SyntacticMatches, 2 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6342 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=816, Invalid=18918, Unknown=6, NotChecked=0, Total=19740 [2021-11-21 00:21:56,506 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 113 mSDsluCounter, 1713 mSDsCounter, 0 mSdLazyCounter, 4339 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 1667 SdHoareTripleChecker+Invalid, 4624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 4339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 158 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:56,506 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 1667 Invalid, 4624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 4339 Invalid, 0 Unknown, 158 Unchecked, 1.9s Time] [2021-11-21 00:21:56,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-11-21 00:21:56,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 157. [2021-11-21 00:21:56,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 116 states have (on average 1.0344827586206897) internal successors, (120), 116 states have internal predecessors, (120), 22 states have call successors, (22), 18 states have call predecessors, (22), 18 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-21 00:21:56,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 164 transitions. [2021-11-21 00:21:56,556 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 164 transitions. Word has length 151 [2021-11-21 00:21:56,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:56,556 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 164 transitions. [2021-11-21 00:21:56,556 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 82 states have (on average 2.2195121951219514) internal successors, (182), 79 states have internal predecessors, (182), 37 states have call successors, (38), 2 states have call predecessors, (38), 3 states have return successors, (39), 39 states have call predecessors, (39), 37 states have call successors, (39) [2021-11-21 00:21:56,557 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 164 transitions. [2021-11-21 00:21:56,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-21 00:21:56,558 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:56,558 INFO L514 BasicCegarLoop]: trace histogram [20, 18, 18, 18, 18, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:56,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-21 00:21:56,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:56,773 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:21:56,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:56,773 INFO L85 PathProgramCache]: Analyzing trace with hash -289225243, now seen corresponding path program 49 times [2021-11-21 00:21:56,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:56,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743079562] [2021-11-21 00:21:56,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:56,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:56,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:57,880 INFO L134 CoverageAnalysis]: Checked inductivity of 1299 backedges. 19 proven. 936 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-21 00:21:57,880 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:57,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743079562] [2021-11-21 00:21:57,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1743079562] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:21:57,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768329201] [2021-11-21 00:21:57,881 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:21:57,881 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:57,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:57,882 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:21:57,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-21 00:21:57,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:57,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 87 conjunts are in the unsatisfiable core [2021-11-21 00:21:57,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:21:59,622 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 29 treesize of output 25 [2021-11-21 00:22:01,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:22:01,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1299 backedges. 19 proven. 936 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-21 00:22:01,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:01,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-21 00:22:01,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 00:22:02,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1299 backedges. 19 proven. 936 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-21 00:22:02,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768329201] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:02,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [31173366] [2021-11-21 00:22:02,074 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:22:02,075 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:02,075 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:02,075 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:02,075 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:02,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:02,363 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-21 00:22:02,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-21 00:22:02,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:02,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:02,431 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:22:02,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:22:03,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:03,408 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 31 treesize of output 33 [2021-11-21 00:22:04,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:04,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:04,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:04,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:04,748 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:22:04,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:22:05,238 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 20 treesize of output 16 [2021-11-21 00:22:06,306 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:22:06,321 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:07,809 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:07,809 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:07,810 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 84 [2021-11-21 00:22:07,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703551565] [2021-11-21 00:22:07,810 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:07,810 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-21 00:22:07,810 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:07,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-21 00:22:07,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=347, Invalid=8773, Unknown=0, NotChecked=0, Total=9120 [2021-11-21 00:22:07,811 INFO L87 Difference]: Start difference. First operand 157 states and 164 transitions. Second operand has 84 states, 83 states have (on average 2.3132530120481927) internal successors, (192), 80 states have internal predecessors, (192), 37 states have call successors, (38), 1 states have call predecessors, (38), 2 states have return successors, (39), 39 states have call predecessors, (39), 37 states have call successors, (39) [2021-11-21 00:22:12,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:12,066 INFO L93 Difference]: Finished difference Result 277 states and 284 transitions. [2021-11-21 00:22:12,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-11-21 00:22:12,066 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 83 states have (on average 2.3132530120481927) internal successors, (192), 80 states have internal predecessors, (192), 37 states have call successors, (38), 1 states have call predecessors, (38), 2 states have return successors, (39), 39 states have call predecessors, (39), 37 states have call successors, (39) Word has length 154 [2021-11-21 00:22:12,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:12,068 INFO L225 Difference]: With dead ends: 277 [2021-11-21 00:22:12,068 INFO L226 Difference]: Without dead ends: 275 [2021-11-21 00:22:12,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 562 GetRequests, 407 SyntacticMatches, 3 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6598 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=1016, Invalid=22546, Unknown=0, NotChecked=0, Total=23562 [2021-11-21 00:22:12,069 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 156 mSDsluCounter, 2059 mSDsCounter, 0 mSdLazyCounter, 5065 mSolverCounterSat, 310 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 2059 SdHoareTripleChecker+Invalid, 5375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 310 IncrementalHoareTripleChecker+Valid, 5065 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:12,069 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 2059 Invalid, 5375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [310 Valid, 5065 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 00:22:12,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2021-11-21 00:22:12,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 160. [2021-11-21 00:22:12,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 119 states have (on average 1.0336134453781514) internal successors, (123), 119 states have internal predecessors, (123), 22 states have call successors, (22), 18 states have call predecessors, (22), 18 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-21 00:22:12,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 167 transitions. [2021-11-21 00:22:12,115 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 167 transitions. Word has length 154 [2021-11-21 00:22:12,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:12,116 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 167 transitions. [2021-11-21 00:22:12,116 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 83 states have (on average 2.3132530120481927) internal successors, (192), 80 states have internal predecessors, (192), 37 states have call successors, (38), 1 states have call predecessors, (38), 2 states have return successors, (39), 39 states have call predecessors, (39), 37 states have call successors, (39) [2021-11-21 00:22:12,116 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 167 transitions. [2021-11-21 00:22:12,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-21 00:22:12,116 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:12,117 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:12,141 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:12,320 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:12,321 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:22:12,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:12,321 INFO L85 PathProgramCache]: Analyzing trace with hash -599307005, now seen corresponding path program 50 times [2021-11-21 00:22:12,321 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:12,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909830685] [2021-11-21 00:22:12,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:12,322 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:12,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:12,891 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 443 proven. 529 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-11-21 00:22:12,891 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:12,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909830685] [2021-11-21 00:22:12,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1909830685] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:12,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2010060539] [2021-11-21 00:22:12,891 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:22:12,892 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:12,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:12,892 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:12,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-21 00:22:14,684 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-11-21 00:22:14,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:22:14,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 536 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-21 00:22:14,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:15,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 495 proven. 477 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-11-21 00:22:15,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:16,005 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 495 proven. 477 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-11-21 00:22:16,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2010060539] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:16,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [284929696] [2021-11-21 00:22:16,006 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:22:16,006 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:16,006 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:16,006 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:16,006 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:16,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:16,244 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:22:16,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:22:16,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:16,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:22:17,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:17,100 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 31 treesize of output 33 [2021-11-21 00:22:18,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:18,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:18,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:18,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:18,311 INFO L354 Elim1Store]: treesize reduction 31, result has 32.6 percent of original size [2021-11-21 00:22:18,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 256 treesize of output 253 [2021-11-21 00:22:18,870 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 20 treesize of output 16 [2021-11-21 00:22:19,928 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:22:19,942 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:20,927 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:20,927 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:20,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2021-11-21 00:22:20,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800490957] [2021-11-21 00:22:20,927 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:20,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-21 00:22:20,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:20,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-21 00:22:20,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=902, Invalid=4354, Unknown=0, NotChecked=0, Total=5256 [2021-11-21 00:22:20,928 INFO L87 Difference]: Start difference. First operand 160 states and 167 transitions. Second operand has 61 states, 61 states have (on average 2.639344262295082) internal successors, (161), 61 states have internal predecessors, (161), 20 states have call successors, (21), 1 states have call predecessors, (21), 1 states have return successors, (21), 20 states have call predecessors, (21), 20 states have call successors, (21) [2021-11-21 00:22:21,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:21,539 INFO L93 Difference]: Finished difference Result 280 states and 287 transitions. [2021-11-21 00:22:21,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-21 00:22:21,540 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.639344262295082) internal successors, (161), 61 states have internal predecessors, (161), 20 states have call successors, (21), 1 states have call predecessors, (21), 1 states have return successors, (21), 20 states have call predecessors, (21), 20 states have call successors, (21) Word has length 157 [2021-11-21 00:22:21,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:21,541 INFO L225 Difference]: With dead ends: 280 [2021-11-21 00:22:21,541 INFO L226 Difference]: Without dead ends: 220 [2021-11-21 00:22:21,542 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 438 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2438 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1487, Invalid=6703, Unknown=0, NotChecked=0, Total=8190 [2021-11-21 00:22:21,542 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 199 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 519 mSolverCounterSat, 144 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 663 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 519 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:21,543 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [200 Valid, 277 Invalid, 663 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [144 Valid, 519 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:22:21,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-21 00:22:21,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 157. [2021-11-21 00:22:21,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 22 states have call successors, (22), 18 states have call predecessors, (22), 18 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-21 00:22:21,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 163 transitions. [2021-11-21 00:22:21,594 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 163 transitions. Word has length 157 [2021-11-21 00:22:21,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:21,594 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 163 transitions. [2021-11-21 00:22:21,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.639344262295082) internal successors, (161), 61 states have internal predecessors, (161), 20 states have call successors, (21), 1 states have call predecessors, (21), 1 states have return successors, (21), 20 states have call predecessors, (21), 20 states have call successors, (21) [2021-11-21 00:22:21,595 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 163 transitions. [2021-11-21 00:22:21,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-21 00:22:21,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:21,596 INFO L514 BasicCegarLoop]: trace histogram [21, 19, 19, 19, 19, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:21,623 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:21,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-11-21 00:22:21,805 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:22:21,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:21,805 INFO L85 PathProgramCache]: Analyzing trace with hash -809955420, now seen corresponding path program 51 times [2021-11-21 00:22:21,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:21,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848765] [2021-11-21 00:22:21,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:21,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:21,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:22,999 INFO L134 CoverageAnalysis]: Checked inductivity of 1394 backedges. 19 proven. 993 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-21 00:22:22,999 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:22,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848765] [2021-11-21 00:22:23,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848765] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:23,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425690081] [2021-11-21 00:22:23,000 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:22:23,000 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:23,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:23,000 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:23,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-21 00:22:23,248 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:22:23,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:22:23,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 542 conjuncts, 89 conjunts are in the unsatisfiable core [2021-11-21 00:22:23,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:24,624 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 23 treesize of output 19 [2021-11-21 00:22:24,887 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:22:24,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:22:26,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:22:26,313 INFO L134 CoverageAnalysis]: Checked inductivity of 1394 backedges. 57 proven. 993 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2021-11-21 00:22:26,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:30,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [425690081] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:30,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [762482305] [2021-11-21 00:22:30,794 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 00:22:30,795 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:30,795 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:30,795 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:30,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:30,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:31,011 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-21 00:22:31,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-21 00:22:31,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:31,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-21 00:22:31,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:31,906 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 35 treesize of output 37 [2021-11-21 00:22:33,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:33,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:33,721 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:33,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:33,727 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-21 00:22:33,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 249 treesize of output 237 [2021-11-21 00:22:34,126 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 20 treesize of output 16 [2021-11-21 00:22:35,168 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 14 for LOIs [2021-11-21 00:22:35,183 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:36,647 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:36,647 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:22:36,647 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45] total 87 [2021-11-21 00:22:36,647 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034515720] [2021-11-21 00:22:36,647 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:36,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-21 00:22:36,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:36,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-21 00:22:36,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=448, Invalid=9650, Unknown=2, NotChecked=0, Total=10100 [2021-11-21 00:22:36,659 INFO L87 Difference]: Start difference. First operand 157 states and 163 transitions. Second operand has 87 states, 86 states have (on average 2.2325581395348837) internal successors, (192), 83 states have internal predecessors, (192), 39 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (41), 41 states have call predecessors, (41), 39 states have call successors, (41) [2021-11-21 00:22:40,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:40,534 INFO L93 Difference]: Finished difference Result 222 states and 227 transitions. [2021-11-21 00:22:40,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-21 00:22:40,535 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 86 states have (on average 2.2325581395348837) internal successors, (192), 83 states have internal predecessors, (192), 39 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (41), 41 states have call predecessors, (41), 39 states have call successors, (41) Word has length 159 [2021-11-21 00:22:40,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:40,536 INFO L225 Difference]: With dead ends: 222 [2021-11-21 00:22:40,537 INFO L226 Difference]: Without dead ends: 220 [2021-11-21 00:22:40,538 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 319 SyntacticMatches, 2 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5623 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=1155, Invalid=19149, Unknown=2, NotChecked=0, Total=20306 [2021-11-21 00:22:40,539 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 118 mSDsluCounter, 2366 mSDsCounter, 0 mSdLazyCounter, 5567 mSolverCounterSat, 219 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 2309 SdHoareTripleChecker+Invalid, 5895 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 219 IncrementalHoareTripleChecker+Valid, 5567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 109 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:40,539 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 2309 Invalid, 5895 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [219 Valid, 5567 Invalid, 0 Unknown, 109 Unchecked, 2.3s Time] [2021-11-21 00:22:40,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-21 00:22:40,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 212. [2021-11-21 00:22:40,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 170 states have (on average 1.0235294117647058) internal successors, (174), 170 states have internal predecessors, (174), 22 states have call successors, (22), 19 states have call predecessors, (22), 19 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-21 00:22:40,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 218 transitions. [2021-11-21 00:22:40,639 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 218 transitions. Word has length 159 [2021-11-21 00:22:40,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:40,639 INFO L470 AbstractCegarLoop]: Abstraction has 212 states and 218 transitions. [2021-11-21 00:22:40,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 86 states have (on average 2.2325581395348837) internal successors, (192), 83 states have internal predecessors, (192), 39 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (41), 41 states have call predecessors, (41), 39 states have call successors, (41) [2021-11-21 00:22:40,640 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 218 transitions. [2021-11-21 00:22:40,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-21 00:22:40,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:40,641 INFO L514 BasicCegarLoop]: trace histogram [22, 20, 20, 20, 20, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:22:40,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:40,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-21 00:22:40,869 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:22:40,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:40,869 INFO L85 PathProgramCache]: Analyzing trace with hash -723598109, now seen corresponding path program 52 times [2021-11-21 00:22:40,869 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:40,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343639132] [2021-11-21 00:22:40,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:40,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:40,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:42,166 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 21 proven. 1001 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2021-11-21 00:22:42,166 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:42,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343639132] [2021-11-21 00:22:42,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [343639132] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:42,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686715528] [2021-11-21 00:22:42,166 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:22:42,166 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:42,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:42,167 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:42,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab9206c4-6005-4101-9b85-32fec0b057c6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-21 00:22:42,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:42,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 89 conjunts are in the unsatisfiable core [2021-11-21 00:22:42,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:43,694 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 23 treesize of output 19 [2021-11-21 00:22:43,959 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:22:43,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 42 [2021-11-21 00:22:44,236 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:22:44,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 42 [2021-11-21 00:22:44,503 INFO L354 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2021-11-21 00:22:44,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2021-11-21 00:22:45,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 28 [2021-11-21 00:22:45,858 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 135 proven. 995 refuted. 0 times theorem prover too weak. 314 trivial. 0 not checked. [2021-11-21 00:22:45,858 INFO L328 TraceCheckSpWp]: Computing backward predicates...