./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const_m2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const_m2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7 --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 06c952a07d861e134050c8036ebe12899287d1c68b93fe51209b5cc562011a68 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:06:43,574 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:06:43,578 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:06:43,637 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:06:43,638 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:06:43,643 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:06:43,645 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:06:43,650 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:06:43,653 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:06:43,659 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:06:43,660 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:06:43,662 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:06:43,663 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:06:43,665 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:06:43,668 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:06:43,673 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:06:43,675 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:06:43,676 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:06:43,679 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:06:43,688 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:06:43,691 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:06:43,692 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:06:43,696 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:06:43,697 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:06:43,700 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:06:43,701 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:06:43,702 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:06:43,703 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:06:43,704 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:06:43,705 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:06:43,706 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:06:43,707 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:06:43,708 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:06:43,709 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:06:43,710 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:06:43,711 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:06:43,712 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:06:43,712 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:06:43,712 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:06:43,713 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:06:43,714 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:06:43,715 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:06:43,742 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:06:43,742 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:06:43,743 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:06:43,743 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:06:43,744 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:06:43,744 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:06:43,744 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:06:43,745 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:06:43,745 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:06:43,745 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:06:43,745 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:06:43,745 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:06:43,746 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:06:43,746 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:06:43,746 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:06:43,746 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:06:43,747 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:06:43,747 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:06:43,748 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:06:43,748 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:06:43,748 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:06:43,748 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:06:43,748 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:06:43,749 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:06:43,749 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:06:43,749 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:06:43,749 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:06:43,750 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:06:43,750 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:06:43,750 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:06:43,750 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:06:43,750 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:06:43,751 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:06:43,751 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:06:43,751 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:06:43,751 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:06:43,751 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:06:43,752 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:06:43,752 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:06:43,752 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:06:43,752 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:06:43,752 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_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 06c952a07d861e134050c8036ebe12899287d1c68b93fe51209b5cc562011a68 [2021-11-25 18:06:44,089 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:06:44,118 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:06:44,121 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:06:44,122 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:06:44,123 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:06:44,124 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-crafted/zero_sum_const_m2.c [2021-11-25 18:06:44,210 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/data/36fd925d7/3c76f39b8dcd425db9c7d70e848ed4f2/FLAG022561b24 [2021-11-25 18:06:44,772 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:06:44,772 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/sv-benchmarks/c/array-crafted/zero_sum_const_m2.c [2021-11-25 18:06:44,786 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/data/36fd925d7/3c76f39b8dcd425db9c7d70e848ed4f2/FLAG022561b24 [2021-11-25 18:06:45,103 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/data/36fd925d7/3c76f39b8dcd425db9c7d70e848ed4f2 [2021-11-25 18:06:45,106 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:06:45,108 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:06:45,110 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:06:45,110 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:06:45,116 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:06:45,117 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:06:45" (1/1) ... [2021-11-25 18:06:45,118 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@583347fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:06:45, skipping insertion in model container [2021-11-25 18:06:45,118 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:06:45" (1/1) ... [2021-11-25 18:06:45,127 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:06:45,143 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:06:45,384 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_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/sv-benchmarks/c/array-crafted/zero_sum_const_m2.c[408,421] [2021-11-25 18:06:45,417 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:06:45,430 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:06:45,449 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_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/sv-benchmarks/c/array-crafted/zero_sum_const_m2.c[408,421] [2021-11-25 18:06:45,473 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:06:45,488 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:06:45,489 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:06:45 WrapperNode [2021-11-25 18:06:45,489 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:06:45,490 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:06:45,490 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:06:45,491 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:06:45,499 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:06:45" (1/1) ... [2021-11-25 18:06:45,508 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:06:45" (1/1) ... [2021-11-25 18:06:45,536 INFO L137 Inliner]: procedures = 16, calls = 14, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 82 [2021-11-25 18:06:45,537 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:06:45,539 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:06:45,539 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:06:45,539 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:06:45,548 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:06:45" (1/1) ... [2021-11-25 18:06:45,548 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:06:45" (1/1) ... [2021-11-25 18:06:45,560 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:06:45" (1/1) ... [2021-11-25 18:06:45,562 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:06:45" (1/1) ... [2021-11-25 18:06:45,568 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:06:45" (1/1) ... [2021-11-25 18:06:45,582 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:06:45" (1/1) ... [2021-11-25 18:06:45,584 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:06:45" (1/1) ... [2021-11-25 18:06:45,590 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:06:45,592 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:06:45,592 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:06:45,592 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:06:45,593 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:06:45" (1/1) ... [2021-11-25 18:06:45,601 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:06:45,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:06:45,626 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:06:45,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:06:45,682 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:06:45,682 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:06:45,682 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 18:06:45,682 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-25 18:06:45,683 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:06:45,683 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:06:45,683 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 18:06:45,767 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:06:45,769 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:06:45,997 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:06:46,052 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:06:46,063 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-25 18:06:46,066 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:06:46 BoogieIcfgContainer [2021-11-25 18:06:46,067 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:06:46,068 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:06:46,069 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:06:46,073 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:06:46,086 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:06:45" (1/3) ... [2021-11-25 18:06:46,087 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@692ee1c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:06:46, skipping insertion in model container [2021-11-25 18:06:46,087 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:06:45" (2/3) ... [2021-11-25 18:06:46,088 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@692ee1c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:06:46, skipping insertion in model container [2021-11-25 18:06:46,088 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:06:46" (3/3) ... [2021-11-25 18:06:46,090 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum_const_m2.c [2021-11-25 18:06:46,096 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:06:46,096 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:06:46,164 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:06:46,176 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 [2021-11-25 18:06:46,177 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:06:46,204 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:46,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 18:06:46,210 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:06:46,211 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:06:46,211 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:06:46,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:06:46,217 INFO L85 PathProgramCache]: Analyzing trace with hash -1853536887, now seen corresponding path program 1 times [2021-11-25 18:06:46,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:06:46,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1876116624] [2021-11-25 18:06:46,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:06:46,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:06:46,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:06:46,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:06:46,402 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:06:46,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1876116624] [2021-11-25 18:06:46,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1876116624] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:06:46,404 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:06:46,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:06:46,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640231426] [2021-11-25 18:06:46,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:06:46,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:06:46,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:06:46,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:06:46,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:06:46,450 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:46,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:06:46,529 INFO L93 Difference]: Finished difference Result 24 states and 35 transitions. [2021-11-25 18:06:46,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:06:46,532 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 18:06:46,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:06:46,542 INFO L225 Difference]: With dead ends: 24 [2021-11-25 18:06:46,542 INFO L226 Difference]: Without dead ends: 11 [2021-11-25 18:06:46,545 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:06:46,559 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:06:46,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:06:46,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-11-25 18:06:46,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-11-25 18:06:46,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:46,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 15 transitions. [2021-11-25 18:06:46,597 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 15 transitions. Word has length 9 [2021-11-25 18:06:46,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:06:46,597 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 15 transitions. [2021-11-25 18:06:46,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:46,599 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 15 transitions. [2021-11-25 18:06:46,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 18:06:46,601 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:06:46,601 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:06:46,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:06:46,603 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:06:46,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:06:46,604 INFO L85 PathProgramCache]: Analyzing trace with hash -288493454, now seen corresponding path program 1 times [2021-11-25 18:06:46,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:06:46,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991663830] [2021-11-25 18:06:46,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:06:46,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:06:46,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:06:46,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:06:46,729 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:06:46,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991663830] [2021-11-25 18:06:46,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1991663830] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:06:46,730 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:06:46,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:06:46,731 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28477902] [2021-11-25 18:06:46,731 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:06:46,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:06:46,732 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:06:46,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:06:46,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:06:46,734 INFO L87 Difference]: Start difference. First operand 11 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:46,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:06:46,813 INFO L93 Difference]: Finished difference Result 21 states and 31 transitions. [2021-11-25 18:06:46,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:06:46,814 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 18:06:46,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:06:46,815 INFO L225 Difference]: With dead ends: 21 [2021-11-25 18:06:46,815 INFO L226 Difference]: Without dead ends: 15 [2021-11-25 18:06:46,816 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 [2021-11-25 18:06:46,817 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:06:46,820 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 5 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:06:46,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-25 18:06:46,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-25 18:06:46,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:46,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2021-11-25 18:06:46,831 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 10 [2021-11-25 18:06:46,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:06:46,832 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2021-11-25 18:06:46,834 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:46,834 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2021-11-25 18:06:46,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 18:06:46,836 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:06:46,837 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:06:46,837 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:06:46,838 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:06:46,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:06:46,839 INFO L85 PathProgramCache]: Analyzing trace with hash -918811174, now seen corresponding path program 1 times [2021-11-25 18:06:46,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:06:46,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1131938329] [2021-11-25 18:06:46,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:06:46,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:06:46,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:06:46,910 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:06:46,910 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:06:46,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1131938329] [2021-11-25 18:06:46,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1131938329] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:06:46,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208120839] [2021-11-25 18:06:46,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:06:46,912 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:06:46,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:06:46,914 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:06:46,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:06:47,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:06:47,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 18:06:47,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:06:47,165 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:06:47,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:06:47,256 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:06:47,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [208120839] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:06:47,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1495865709] [2021-11-25 18:06:47,281 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:06:47,282 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:06:47,288 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:06:47,294 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:06:47,295 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:06:47,483 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:06:47,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:06:47,515 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 [2021-11-25 18:06:47,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:06:47,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:47,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:47,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:47,832 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:06:47,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:06:47,951 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 16 treesize of output 12 [2021-11-25 18:06:48,270 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:06:48,606 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '220#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:06:48,607 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:06:48,607 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:06:48,607 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-25 18:06:48,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024985974] [2021-11-25 18:06:48,608 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:06:48,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:06:48,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:06:48,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:06:48,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:06:48,610 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:48,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:06:48,665 INFO L93 Difference]: Finished difference Result 27 states and 35 transitions. [2021-11-25 18:06:48,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:06:48,666 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 18:06:48,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:06:48,667 INFO L225 Difference]: With dead ends: 27 [2021-11-25 18:06:48,667 INFO L226 Difference]: Without dead ends: 16 [2021-11-25 18:06:48,670 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 27 SyntacticMatches, 7 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:06:48,674 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:06:48,684 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:06:48,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-25 18:06:48,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-25 18:06:48,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:48,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-25 18:06:48,692 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 14 [2021-11-25 18:06:48,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:06:48,692 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-25 18:06:48,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:48,696 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-25 18:06:48,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 18:06:48,697 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:06:48,698 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:06:48,733 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 18:06:48,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:06:48,928 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:06:48,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:06:48,928 INFO L85 PathProgramCache]: Analyzing trace with hash 510053521, now seen corresponding path program 2 times [2021-11-25 18:06:48,928 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:06:48,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52887188] [2021-11-25 18:06:48,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:06:48,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:06:48,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:06:49,040 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:06:49,040 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:06:49,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52887188] [2021-11-25 18:06:49,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [52887188] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:06:49,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1095835578] [2021-11-25 18:06:49,041 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:06:49,041 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:06:49,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:06:49,045 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:06:49,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:06:49,119 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 18:06:49,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:06:49,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 18:06:49,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:06:49,206 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:06:49,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:06:49,255 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:06:49,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1095835578] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:06:49,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1400521525] [2021-11-25 18:06:49,270 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:06:49,270 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:06:49,270 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:06:49,271 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:06:49,271 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:06:49,361 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:06:49,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:06:49,378 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 [2021-11-25 18:06:49,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:06:49,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:49,519 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:06:49,546 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:06:49,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:06:49,688 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 16 treesize of output 12 [2021-11-25 18:06:49,881 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:06:50,165 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '390#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:06:50,165 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:06:50,165 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:06:50,165 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-25 18:06:50,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995625857] [2021-11-25 18:06:50,166 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:06:50,166 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:06:50,166 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:06:50,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:06:50,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-25 18:06:50,167 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:50,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:06:50,229 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2021-11-25 18:06:50,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:06:50,230 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-25 18:06:50,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:06:50,230 INFO L225 Difference]: With dead ends: 29 [2021-11-25 18:06:50,230 INFO L226 Difference]: Without dead ends: 20 [2021-11-25 18:06:50,231 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 29 SyntacticMatches, 8 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-25 18:06:50,232 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:06:50,233 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 7 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:06:50,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-25 18:06:50,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-25 18:06:50,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:50,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-11-25 18:06:50,239 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 15 [2021-11-25 18:06:50,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:06:50,240 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-11-25 18:06:50,240 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:50,240 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-11-25 18:06:50,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 18:06:50,241 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:06:50,241 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:06:50,284 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-25 18:06:50,460 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:06:50,461 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:06:50,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:06:50,461 INFO L85 PathProgramCache]: Analyzing trace with hash -869134615, now seen corresponding path program 3 times [2021-11-25 18:06:50,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:06:50,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496917622] [2021-11-25 18:06:50,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:06:50,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:06:50,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:06:51,211 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:06:51,213 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:06:51,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496917622] [2021-11-25 18:06:51,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1496917622] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:06:51,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1913780599] [2021-11-25 18:06:51,214 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:06:51,214 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:06:51,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:06:51,215 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:06:51,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:06:51,276 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:06:51,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:06:51,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-25 18:06:51,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:06:51,764 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:06:51,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:06:52,355 INFO L354 Elim1Store]: treesize reduction 39, result has 52.4 percent of original size [2021-11-25 18:06:52,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 51 [2021-11-25 18:06:52,466 INFO L354 Elim1Store]: treesize reduction 73, result has 11.0 percent of original size [2021-11-25 18:06:52,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 18 [2021-11-25 18:06:52,519 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 18:06:52,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1913780599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:06:52,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1733368083] [2021-11-25 18:06:52,521 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:06:52,521 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:06:52,522 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:06:52,522 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:06:52,522 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:06:52,581 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:06:52,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:06:52,633 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:06:52,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:06:52,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:06:52,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:52,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:52,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:52,775 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:06:52,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:06:52,828 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 16 treesize of output 12 [2021-11-25 18:06:52,982 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:06:53,349 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '624#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:06:53,350 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:06:53,350 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:06:53,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 14] total 36 [2021-11-25 18:06:53,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049671282] [2021-11-25 18:06:53,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:06:53,351 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 18:06:53,351 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:06:53,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 18:06:53,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1508, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 18:06:53,352 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 36 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:53,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:06:53,934 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2021-11-25 18:06:53,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 18:06:53,935 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 36 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-25 18:06:53,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:06:53,936 INFO L225 Difference]: With dead ends: 33 [2021-11-25 18:06:53,936 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 18:06:53,937 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 30 SyntacticMatches, 4 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 489 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=159, Invalid=1911, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 18:06:53,938 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 396 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 396 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:06:53,938 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 37 Invalid, 403 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 396 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:06:53,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 18:06:53,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2021-11-25 18:06:53,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:53,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2021-11-25 18:06:53,944 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 19 [2021-11-25 18:06:53,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:06:53,944 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2021-11-25 18:06:53,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 36 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:53,945 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2021-11-25 18:06:53,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 18:06:53,945 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:06:53,946 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:06:53,987 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:06:54,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:06:54,173 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:06:54,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:06:54,173 INFO L85 PathProgramCache]: Analyzing trace with hash -1056486243, now seen corresponding path program 4 times [2021-11-25 18:06:54,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:06:54,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1408517115] [2021-11-25 18:06:54,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:06:54,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:06:54,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:06:54,262 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:06:54,262 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:06:54,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1408517115] [2021-11-25 18:06:54,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1408517115] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:06:54,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [494125120] [2021-11-25 18:06:54,263 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:06:54,263 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:06:54,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:06:54,264 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:06:54,288 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:06:54,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:06:54,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:06:54,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:06:54,447 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:06:54,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:06:54,502 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:06:54,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [494125120] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:06:54,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [701899213] [2021-11-25 18:06:54,504 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:06:54,504 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:06:54,505 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:06:54,505 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:06:54,505 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:06:54,593 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:06:54,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:06:54,674 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:06:54,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:06:54,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:06:54,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:54,793 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:06:54,815 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:06:54,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:06:54,884 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 16 treesize of output 12 [2021-11-25 18:06:55,064 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:06:55,456 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '875#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:06:55,456 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:06:55,456 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:06:55,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2021-11-25 18:06:55,456 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832004079] [2021-11-25 18:06:55,456 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:06:55,457 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 18:06:55,457 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:06:55,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 18:06:55,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2021-11-25 18:06:55,458 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:55,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:06:55,592 INFO L93 Difference]: Finished difference Result 62 states and 77 transitions. [2021-11-25 18:06:55,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 18:06:55,594 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-25 18:06:55,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:06:55,595 INFO L225 Difference]: With dead ends: 62 [2021-11-25 18:06:55,595 INFO L226 Difference]: Without dead ends: 37 [2021-11-25 18:06:55,596 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 41 SyntacticMatches, 9 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2021-11-25 18:06:55,597 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:06:55,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 13 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:06:55,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-25 18:06:55,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2021-11-25 18:06:55,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:55,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-11-25 18:06:55,604 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 20 [2021-11-25 18:06:55,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:06:55,604 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-11-25 18:06:55,604 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:55,605 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-11-25 18:06:55,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-25 18:06:55,606 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:06:55,606 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:06:55,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:06:55,820 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 18:06:55,820 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:06:55,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:06:55,821 INFO L85 PathProgramCache]: Analyzing trace with hash -1086331372, now seen corresponding path program 5 times [2021-11-25 18:06:55,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:06:55,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131084076] [2021-11-25 18:06:55,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:06:55,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:06:55,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:06:55,962 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:06:55,962 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:06:55,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131084076] [2021-11-25 18:06:55,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131084076] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:06:55,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485465856] [2021-11-25 18:06:55,963 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:06:55,963 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:06:55,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:06:55,964 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:06:55,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:06:56,033 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:06:56,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:06:56,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:06:56,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:06:56,133 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:06:56,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:06:56,188 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:06:56,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1485465856] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:06:56,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1366268644] [2021-11-25 18:06:56,191 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:06:56,192 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:06:56,192 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:06:56,192 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:06:56,192 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:06:56,265 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:06:56,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:06:56,277 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 [2021-11-25 18:06:56,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:06:56,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:56,366 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:06:56,396 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:06:56,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:06:56,481 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 16 treesize of output 12 [2021-11-25 18:06:56,645 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:06:56,907 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1185#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:06:56,907 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:06:56,908 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:06:56,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-25 18:06:56,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367891079] [2021-11-25 18:06:56,908 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:06:56,908 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 18:06:56,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:06:56,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 18:06:56,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-25 18:06:56,910 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:57,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:06:57,072 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2021-11-25 18:06:57,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 18:06:57,072 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-25 18:06:57,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:06:57,073 INFO L225 Difference]: With dead ends: 34 [2021-11-25 18:06:57,073 INFO L226 Difference]: Without dead ends: 25 [2021-11-25 18:06:57,074 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 42 SyntacticMatches, 11 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2021-11-25 18:06:57,075 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:06:57,076 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 13 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:06:57,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-25 18:06:57,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-25 18:06:57,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:57,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-11-25 18:06:57,082 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 21 [2021-11-25 18:06:57,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:06:57,082 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-11-25 18:06:57,083 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:06:57,083 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-11-25 18:06:57,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 18:06:57,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:06:57,084 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:06:57,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:06:57,300 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 18:06:57,301 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:06:57,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:06:57,301 INFO L85 PathProgramCache]: Analyzing trace with hash 1278953466, now seen corresponding path program 6 times [2021-11-25 18:06:57,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:06:57,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1277280567] [2021-11-25 18:06:57,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:06:57,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:06:57,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:06:58,530 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:06:58,530 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:06:58,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1277280567] [2021-11-25 18:06:58,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1277280567] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:06:58,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104531509] [2021-11-25 18:06:58,531 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:06:58,531 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:06:58,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:06:58,532 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:06:58,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:06:58,591 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:06:58,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:06:58,592 WARN L261 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-25 18:06:58,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:06:59,406 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:06:59,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:07:00,350 INFO L354 Elim1Store]: treesize reduction 114, result has 46.0 percent of original size [2021-11-25 18:07:00,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2021-11-25 18:07:00,631 INFO L354 Elim1Store]: treesize reduction 198, result has 6.2 percent of original size [2021-11-25 18:07:00,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2021-11-25 18:07:00,698 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:07:00,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104531509] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:07:00,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [177888842] [2021-11-25 18:07:00,702 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:07:00,702 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:07:00,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:07:00,704 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:07:00,705 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:07:00,768 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:07:00,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:07:00,786 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 [2021-11-25 18:07:00,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:07:00,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:00,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:00,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:00,875 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:07:00,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:07:00,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:07:01,060 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:07:01,441 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1494#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:07:01,441 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:07:01,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:07:01,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 19, 18] total 51 [2021-11-25 18:07:01,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468811645] [2021-11-25 18:07:01,442 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:07:01,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-25 18:07:01,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:07:01,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-25 18:07:01,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=2910, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 18:07:01,444 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 51 states, 51 states have (on average 1.2156862745098038) internal successors, (62), 51 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:03,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:07:03,466 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2021-11-25 18:07:03,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 18:07:03,466 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.2156862745098038) internal successors, (62), 51 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-25 18:07:03,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:07:03,467 INFO L225 Difference]: With dead ends: 47 [2021-11-25 18:07:03,468 INFO L226 Difference]: Without dead ends: 44 [2021-11-25 18:07:03,470 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 35 SyntacticMatches, 4 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1194 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=320, Invalid=5082, Unknown=0, NotChecked=0, Total=5402 [2021-11-25 18:07:03,470 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 780 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 833 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 780 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:07:03,471 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 113 Invalid, 833 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 780 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:07:03,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-25 18:07:03,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 35. [2021-11-25 18:07:03,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:03,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-11-25 18:07:03,478 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 24 [2021-11-25 18:07:03,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:07:03,478 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-11-25 18:07:03,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.2156862745098038) internal successors, (62), 51 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:03,479 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-11-25 18:07:03,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 18:07:03,479 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:07:03,479 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:07:03,500 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-25 18:07:03,680 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:03,680 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:07:03,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:07:03,681 INFO L85 PathProgramCache]: Analyzing trace with hash -866602372, now seen corresponding path program 7 times [2021-11-25 18:07:03,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:07:03,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1227653627] [2021-11-25 18:07:03,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:07:03,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:07:03,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:03,757 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 18:07:03,757 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:07:03,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1227653627] [2021-11-25 18:07:03,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1227653627] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:07:03,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218100436] [2021-11-25 18:07:03,758 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:07:03,758 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:03,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:07:03,764 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:07:03,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:07:03,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:03,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 18:07:03,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:07:03,940 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 18:07:03,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:07:04,002 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 18:07:04,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1218100436] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:07:04,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1890621502] [2021-11-25 18:07:04,007 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:07:04,007 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:07:04,008 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:07:04,008 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:07:04,008 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:07:04,066 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:07:04,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:07:04,085 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 [2021-11-25 18:07:04,125 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:07:04,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:04,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:04,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:04,213 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:07:04,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:07:04,276 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 16 treesize of output 12 [2021-11-25 18:07:04,438 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:07:04,811 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1843#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:07:04,812 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:07:04,812 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:07:04,812 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2021-11-25 18:07:04,812 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472445507] [2021-11-25 18:07:04,813 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:07:04,813 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 18:07:04,813 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:07:04,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 18:07:04,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2021-11-25 18:07:04,814 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:05,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:07:05,021 INFO L93 Difference]: Finished difference Result 76 states and 91 transitions. [2021-11-25 18:07:05,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:07:05,024 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-25 18:07:05,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:07:05,025 INFO L225 Difference]: With dead ends: 76 [2021-11-25 18:07:05,025 INFO L226 Difference]: Without dead ends: 44 [2021-11-25 18:07:05,026 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 52 SyntacticMatches, 12 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2021-11-25 18:07:05,027 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 30 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:07:05,027 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 13 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:07:05,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-25 18:07:05,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2021-11-25 18:07:05,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 36 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:05,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-11-25 18:07:05,034 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 25 [2021-11-25 18:07:05,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:07:05,034 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-11-25 18:07:05,034 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:05,034 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-11-25 18:07:05,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 18:07:05,035 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:07:05,035 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:07:05,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:07:05,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:05,236 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:07:05,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:07:05,236 INFO L85 PathProgramCache]: Analyzing trace with hash -777491611, now seen corresponding path program 8 times [2021-11-25 18:07:05,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:07:05,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011747468] [2021-11-25 18:07:05,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:07:05,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:07:05,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:05,332 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 18:07:05,333 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:07:05,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011747468] [2021-11-25 18:07:05,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011747468] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:07:05,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387172379] [2021-11-25 18:07:05,333 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:07:05,334 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:05,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:07:05,335 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:07:05,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:07:05,399 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:07:05,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:07:05,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 18:07:05,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:07:05,516 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 18:07:05,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:07:05,609 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 18:07:05,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387172379] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:07:05,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1755736120] [2021-11-25 18:07:05,611 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:07:05,611 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:07:05,611 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:07:05,611 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:07:05,612 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:07:05,666 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:07:05,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:07:05,676 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 [2021-11-25 18:07:05,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:07:05,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:05,749 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:07:05,771 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:07:05,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:07:05,876 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 16 treesize of output 12 [2021-11-25 18:07:05,996 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:07:06,137 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2230#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:07:06,137 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:07:06,137 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:07:06,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-25 18:07:06,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398619833] [2021-11-25 18:07:06,138 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:07:06,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 18:07:06,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:07:06,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 18:07:06,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2021-11-25 18:07:06,139 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:06,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:07:06,323 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2021-11-25 18:07:06,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 18:07:06,329 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-25 18:07:06,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:07:06,329 INFO L225 Difference]: With dead ends: 41 [2021-11-25 18:07:06,330 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 18:07:06,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=148, Invalid=608, Unknown=0, NotChecked=0, Total=756 [2021-11-25 18:07:06,331 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:07:06,331 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 13 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:07:06,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 18:07:06,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-25 18:07:06,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:06,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-11-25 18:07:06,346 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 26 [2021-11-25 18:07:06,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:07:06,347 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-11-25 18:07:06,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:06,347 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-11-25 18:07:06,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-25 18:07:06,351 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:07:06,351 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:07:06,392 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:07:06,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 18:07:06,552 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:07:06,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:07:06,552 INFO L85 PathProgramCache]: Analyzing trace with hash -1967427511, now seen corresponding path program 9 times [2021-11-25 18:07:06,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:07:06,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102332021] [2021-11-25 18:07:06,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:07:06,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:07:06,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:08,029 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 1 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:07:08,029 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:07:08,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1102332021] [2021-11-25 18:07:08,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1102332021] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:07:08,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051728905] [2021-11-25 18:07:08,030 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:07:08,030 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:08,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:07:08,032 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:07:08,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 18:07:08,096 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:07:08,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:07:08,098 WARN L261 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-25 18:07:08,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:07:09,165 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:07:09,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:07:10,754 INFO L354 Elim1Store]: treesize reduction 227, result has 43.3 percent of original size [2021-11-25 18:07:10,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 185 [2021-11-25 18:07:11,622 INFO L354 Elim1Store]: treesize reduction 383, result has 4.3 percent of original size [2021-11-25 18:07:11,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 30 [2021-11-25 18:07:11,696 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:07:11,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051728905] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:07:11,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [446468693] [2021-11-25 18:07:11,699 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:07:11,699 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:07:11,699 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:07:11,699 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:07:11,700 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:07:11,759 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:07:11,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:07:11,772 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 [2021-11-25 18:07:11,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:07:11,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:11,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:11,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:11,873 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:07:11,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:07:11,927 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 16 treesize of output 12 [2021-11-25 18:07:12,056 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:07:12,581 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2609#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:07:12,582 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:07:12,582 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:07:12,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 24, 22] total 65 [2021-11-25 18:07:12,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578290193] [2021-11-25 18:07:12,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:07:12,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-25 18:07:12,583 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:07:12,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-25 18:07:12,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=4593, Unknown=0, NotChecked=0, Total=4830 [2021-11-25 18:07:12,586 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 65 states, 65 states have (on average 1.1692307692307693) internal successors, (76), 65 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:15,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:07:15,715 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2021-11-25 18:07:15,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 18:07:15,716 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.1692307692307693) internal successors, (76), 65 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-25 18:07:15,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:07:15,718 INFO L225 Difference]: With dead ends: 55 [2021-11-25 18:07:15,718 INFO L226 Difference]: Without dead ends: 52 [2021-11-25 18:07:15,721 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2175 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=437, Invalid=7753, Unknown=0, NotChecked=0, Total=8190 [2021-11-25 18:07:15,722 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 9 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 1272 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 1352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 1272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:07:15,722 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 162 Invalid, 1352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 1272 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 18:07:15,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-25 18:07:15,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 42. [2021-11-25 18:07:15,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 41 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:15,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2021-11-25 18:07:15,734 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 29 [2021-11-25 18:07:15,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:07:15,734 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2021-11-25 18:07:15,735 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.1692307692307693) internal successors, (76), 65 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:15,735 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2021-11-25 18:07:15,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-25 18:07:15,736 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:07:15,736 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:07:15,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 18:07:15,944 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 18:07:15,944 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:07:15,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:07:15,945 INFO L85 PathProgramCache]: Analyzing trace with hash 1818473405, now seen corresponding path program 10 times [2021-11-25 18:07:15,945 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:07:15,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209194442] [2021-11-25 18:07:15,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:07:15,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:07:15,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:16,056 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 18:07:16,057 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:07:16,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209194442] [2021-11-25 18:07:16,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1209194442] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:07:16,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [954627206] [2021-11-25 18:07:16,058 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:07:16,058 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:16,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:07:16,061 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:07:16,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 18:07:16,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:16,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 18:07:16,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:07:16,297 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 18:07:16,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:07:16,392 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 18:07:16,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [954627206] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:07:16,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [619392211] [2021-11-25 18:07:16,395 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:07:16,395 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:07:16,395 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:07:16,395 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:07:16,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:07:16,458 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:07:16,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:07:16,471 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 [2021-11-25 18:07:16,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:07:16,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:16,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:16,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:16,571 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:07:16,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:07:16,619 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 16 treesize of output 12 [2021-11-25 18:07:16,726 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:07:16,889 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3027#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:07:16,889 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:07:16,889 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:07:16,889 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2021-11-25 18:07:16,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190053865] [2021-11-25 18:07:16,890 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:07:16,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 18:07:16,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:07:16,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 18:07:16,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2021-11-25 18:07:16,891 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:17,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:07:17,091 INFO L93 Difference]: Finished difference Result 90 states and 105 transitions. [2021-11-25 18:07:17,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 18:07:17,092 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-25 18:07:17,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:07:17,092 INFO L225 Difference]: With dead ends: 90 [2021-11-25 18:07:17,093 INFO L226 Difference]: Without dead ends: 51 [2021-11-25 18:07:17,093 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=172, Invalid=640, Unknown=0, NotChecked=0, Total=812 [2021-11-25 18:07:17,094 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:07:17,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 17 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:07:17,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-25 18:07:17,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2021-11-25 18:07:17,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.1627906976744187) internal successors, (50), 43 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:17,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2021-11-25 18:07:17,127 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 30 [2021-11-25 18:07:17,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:07:17,128 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2021-11-25 18:07:17,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:17,128 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2021-11-25 18:07:17,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 18:07:17,132 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:07:17,133 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:07:17,172 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 18:07:17,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:17,348 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:07:17,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:07:17,349 INFO L85 PathProgramCache]: Analyzing trace with hash -373283724, now seen corresponding path program 11 times [2021-11-25 18:07:17,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:07:17,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824417177] [2021-11-25 18:07:17,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:07:17,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:07:17,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:17,480 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 18:07:17,481 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:07:17,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824417177] [2021-11-25 18:07:17,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824417177] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:07:17,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456526052] [2021-11-25 18:07:17,482 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:07:17,482 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:17,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:07:17,483 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:07:17,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 18:07:17,566 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 18:07:17,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:07:17,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 18:07:17,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:07:17,751 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 18:07:17,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:07:17,842 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 18:07:17,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [456526052] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:07:17,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1176278018] [2021-11-25 18:07:17,844 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:07:17,844 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:07:17,845 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:07:17,845 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:07:17,845 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:07:17,900 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:07:17,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:07:17,952 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:07:17,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:07:17,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:07:18,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:18,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:18,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:18,038 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:07:18,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:07:18,095 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 16 treesize of output 12 [2021-11-25 18:07:18,201 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:07:18,355 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3491#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:07:18,355 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:07:18,356 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:07:18,356 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-25 18:07:18,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493628291] [2021-11-25 18:07:18,356 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:07:18,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 18:07:18,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:07:18,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 18:07:18,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2021-11-25 18:07:18,357 INFO L87 Difference]: Start difference. First operand 44 states and 50 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:18,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:07:18,555 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2021-11-25 18:07:18,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 18:07:18,556 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-25 18:07:18,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:07:18,557 INFO L225 Difference]: With dead ends: 48 [2021-11-25 18:07:18,557 INFO L226 Difference]: Without dead ends: 35 [2021-11-25 18:07:18,558 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 79 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=192, Invalid=800, Unknown=0, NotChecked=0, Total=992 [2021-11-25 18:07:18,559 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:07:18,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 15 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:07:18,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-25 18:07:18,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-11-25 18:07:18,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:18,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-11-25 18:07:18,568 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 31 [2021-11-25 18:07:18,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:07:18,569 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-11-25 18:07:18,569 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:18,569 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-11-25 18:07:18,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 18:07:18,570 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:07:18,570 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:07:18,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 18:07:18,792 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 18:07:18,793 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:07:18,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:07:18,793 INFO L85 PathProgramCache]: Analyzing trace with hash 1803528730, now seen corresponding path program 12 times [2021-11-25 18:07:18,793 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:07:18,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870398654] [2021-11-25 18:07:18,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:07:18,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:07:18,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:20,674 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 3 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:07:20,674 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:07:20,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870398654] [2021-11-25 18:07:20,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870398654] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:07:20,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [955764623] [2021-11-25 18:07:20,675 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:07:20,675 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:20,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:07:20,675 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:07:20,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 18:07:20,736 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:07:20,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:07:20,738 WARN L261 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 97 conjunts are in the unsatisfiable core [2021-11-25 18:07:20,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:07:22,282 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 74 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:07:22,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:07:24,622 INFO L354 Elim1Store]: treesize reduction 378, result has 41.8 percent of original size [2021-11-25 18:07:24,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 285 [2021-11-25 18:07:26,245 INFO L354 Elim1Store]: treesize reduction 628, result has 3.2 percent of original size [2021-11-25 18:07:26,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 36 [2021-11-25 18:07:26,334 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 18:07:26,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [955764623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:07:26,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [763937586] [2021-11-25 18:07:26,336 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:07:26,336 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:07:26,336 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:07:26,337 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:07:26,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:07:26,414 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:07:26,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:07:26,426 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 [2021-11-25 18:07:26,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:07:26,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:26,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:26,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:26,520 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:07:26,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:07:26,565 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 16 treesize of output 12 [2021-11-25 18:07:26,690 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:07:28,375 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3940#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:07:28,375 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:07:28,376 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:07:28,376 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 29, 26] total 79 [2021-11-25 18:07:28,376 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091216572] [2021-11-25 18:07:28,376 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:07:28,377 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-25 18:07:28,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:07:28,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-25 18:07:28,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=6680, Unknown=0, NotChecked=0, Total=6972 [2021-11-25 18:07:28,380 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 79 states, 79 states have (on average 1.139240506329114) internal successors, (90), 79 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:32,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:07:32,158 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2021-11-25 18:07:32,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-25 18:07:32,161 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.139240506329114) internal successors, (90), 79 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-25 18:07:32,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:07:32,162 INFO L225 Difference]: With dead ends: 63 [2021-11-25 18:07:32,162 INFO L226 Difference]: Without dead ends: 60 [2021-11-25 18:07:32,166 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 29 SyntacticMatches, 22 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4375 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=506, Invalid=10624, Unknown=0, NotChecked=0, Total=11130 [2021-11-25 18:07:32,167 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 9 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 1692 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 1772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 1692 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:07:32,167 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 186 Invalid, 1772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 1692 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-25 18:07:32,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-25 18:07:32,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 49. [2021-11-25 18:07:32,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1666666666666667) internal successors, (56), 48 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:32,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2021-11-25 18:07:32,179 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 34 [2021-11-25 18:07:32,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:07:32,180 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2021-11-25 18:07:32,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.139240506329114) internal successors, (90), 79 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:32,180 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2021-11-25 18:07:32,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 18:07:32,181 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:07:32,181 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:07:32,205 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 18:07:32,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:32,389 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:07:32,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:07:32,389 INFO L85 PathProgramCache]: Analyzing trace with hash 721916124, now seen corresponding path program 13 times [2021-11-25 18:07:32,389 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:07:32,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1485756280] [2021-11-25 18:07:32,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:07:32,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:07:32,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:32,503 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:07:32,503 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:07:32,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1485756280] [2021-11-25 18:07:32,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1485756280] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:07:32,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1524871775] [2021-11-25 18:07:32,504 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:07:32,504 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:32,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:07:32,506 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:07:32,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 18:07:32,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:32,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:07:32,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:07:32,772 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:07:32,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:07:32,855 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:07:32,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1524871775] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:07:32,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [191099209] [2021-11-25 18:07:32,857 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:07:32,857 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:07:32,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:07:32,858 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:07:32,858 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:07:32,918 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:07:32,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:07:32,971 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:07:32,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:07:32,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:07:33,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:33,060 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:07:33,086 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:07:33,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:07:33,165 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 16 treesize of output 12 [2021-11-25 18:07:33,278 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:07:33,499 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4423#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:07:33,499 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:07:33,499 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:07:33,499 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2021-11-25 18:07:33,500 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058261600] [2021-11-25 18:07:33,500 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:07:33,500 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 18:07:33,500 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:07:33,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 18:07:33,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=554, Unknown=0, NotChecked=0, Total=702 [2021-11-25 18:07:33,501 INFO L87 Difference]: Start difference. First operand 49 states and 56 transitions. Second operand has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:33,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:07:33,765 INFO L93 Difference]: Finished difference Result 104 states and 119 transitions. [2021-11-25 18:07:33,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 18:07:33,766 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-25 18:07:33,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:07:33,767 INFO L225 Difference]: With dead ends: 104 [2021-11-25 18:07:33,768 INFO L226 Difference]: Without dead ends: 58 [2021-11-25 18:07:33,771 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=223, Invalid=833, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 18:07:33,773 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 21 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:07:33,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 15 Invalid, 335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:07:33,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-25 18:07:33,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 51. [2021-11-25 18:07:33,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.14) internal successors, (57), 50 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:33,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2021-11-25 18:07:33,800 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 35 [2021-11-25 18:07:33,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:07:33,801 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2021-11-25 18:07:33,801 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:33,801 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2021-11-25 18:07:33,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 18:07:33,802 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:07:33,802 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:07:33,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 18:07:34,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:34,016 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:07:34,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:07:34,017 INFO L85 PathProgramCache]: Analyzing trace with hash -29885819, now seen corresponding path program 14 times [2021-11-25 18:07:34,017 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:07:34,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536954115] [2021-11-25 18:07:34,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:07:34,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:07:34,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:34,170 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-25 18:07:34,170 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:07:34,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536954115] [2021-11-25 18:07:34,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [536954115] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:07:34,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668339224] [2021-11-25 18:07:34,170 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:07:34,170 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:34,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:07:34,173 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:07:34,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 18:07:34,268 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 18:07:34,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:07:34,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:07:34,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:07:34,431 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-25 18:07:34,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:07:34,514 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-25 18:07:34,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [668339224] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:07:34,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [242952969] [2021-11-25 18:07:34,516 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:07:34,516 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:07:34,516 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:07:34,516 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:07:34,516 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:07:34,565 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:07:34,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:07:34,573 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 [2021-11-25 18:07:34,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2021-11-25 18:07:34,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:34,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:34,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:34,645 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:07:34,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:07:34,710 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 16 treesize of output 12 [2021-11-25 18:07:34,840 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:07:35,222 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4964#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:07:35,222 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:07:35,222 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:07:35,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-25 18:07:35,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14153389] [2021-11-25 18:07:35,223 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:07:35,224 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 18:07:35,224 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:07:35,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 18:07:35,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=605, Unknown=0, NotChecked=0, Total=756 [2021-11-25 18:07:35,226 INFO L87 Difference]: Start difference. First operand 51 states and 57 transitions. Second operand has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:35,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:07:35,455 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2021-11-25 18:07:35,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 18:07:35,456 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-25 18:07:35,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:07:35,456 INFO L225 Difference]: With dead ends: 55 [2021-11-25 18:07:35,456 INFO L226 Difference]: Without dead ends: 40 [2021-11-25 18:07:35,457 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 75 SyntacticMatches, 20 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 872 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=243, Invalid=1017, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 18:07:35,458 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 364 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:07:35,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 11 Invalid, 364 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:07:35,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-25 18:07:35,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-25 18:07:35,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 39 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:35,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-11-25 18:07:35,468 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 36 [2021-11-25 18:07:35,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:07:35,468 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-11-25 18:07:35,468 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:35,469 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-11-25 18:07:35,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 18:07:35,469 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:07:35,469 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:07:35,502 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-11-25 18:07:35,684 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 18:07:35,684 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:07:35,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:07:35,685 INFO L85 PathProgramCache]: Analyzing trace with hash 1991993769, now seen corresponding path program 15 times [2021-11-25 18:07:35,685 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:07:35,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333449073] [2021-11-25 18:07:35,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:07:35,685 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:07:35,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:38,669 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 3 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:07:38,669 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:07:38,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333449073] [2021-11-25 18:07:38,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1333449073] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:07:38,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432747455] [2021-11-25 18:07:38,669 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:07:38,669 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:38,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:07:38,670 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:07:38,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 18:07:38,741 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:07:38,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:07:38,743 WARN L261 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 115 conjunts are in the unsatisfiable core [2021-11-25 18:07:38,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:07:40,816 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 104 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:07:40,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:07:44,210 INFO L354 Elim1Store]: treesize reduction 567, result has 40.8 percent of original size [2021-11-25 18:07:44,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 104 treesize of output 408 [2021-11-25 18:07:47,073 INFO L354 Elim1Store]: treesize reduction 933, result has 2.6 percent of original size [2021-11-25 18:07:47,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 41 [2021-11-25 18:07:47,175 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 18:07:47,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [432747455] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:07:47,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1728030054] [2021-11-25 18:07:47,176 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:07:47,177 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:07:47,177 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:07:47,177 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:07:47,177 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:07:47,228 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:07:47,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:07:47,236 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 [2021-11-25 18:07:47,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:07:47,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:47,313 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:07:47,335 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:07:47,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:07:47,403 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 16 treesize of output 12 [2021-11-25 18:07:47,534 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:07:48,246 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5483#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:07:48,246 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:07:48,247 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:07:48,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 34, 30] total 93 [2021-11-25 18:07:48,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379451153] [2021-11-25 18:07:48,247 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:07:48,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2021-11-25 18:07:48,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:07:48,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-11-25 18:07:48,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=373, Invalid=9133, Unknown=0, NotChecked=0, Total=9506 [2021-11-25 18:07:48,252 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 93 states, 93 states have (on average 1.118279569892473) internal successors, (104), 93 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:53,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:07:53,004 INFO L93 Difference]: Finished difference Result 71 states and 80 transitions. [2021-11-25 18:07:53,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-25 18:07:53,005 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.118279569892473) internal successors, (104), 93 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-25 18:07:53,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:07:53,006 INFO L225 Difference]: With dead ends: 71 [2021-11-25 18:07:53,006 INFO L226 Difference]: Without dead ends: 68 [2021-11-25 18:07:53,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 53 SyntacticMatches, 4 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4633 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=610, Invalid=13670, Unknown=0, NotChecked=0, Total=14280 [2021-11-25 18:07:53,008 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 14 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 2305 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 2396 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 2305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:07:53,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 224 Invalid, 2396 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 2305 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-25 18:07:53,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-25 18:07:53,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 56. [2021-11-25 18:07:53,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 55 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:53,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2021-11-25 18:07:53,023 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 39 [2021-11-25 18:07:53,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:07:53,023 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2021-11-25 18:07:53,024 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 1.118279569892473) internal successors, (104), 93 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:53,024 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2021-11-25 18:07:53,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 18:07:53,024 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:07:53,024 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:07:53,045 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-25 18:07:53,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 18:07:53,228 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:07:53,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:07:53,229 INFO L85 PathProgramCache]: Analyzing trace with hash 198689501, now seen corresponding path program 16 times [2021-11-25 18:07:53,229 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:07:53,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368338348] [2021-11-25 18:07:53,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:07:53,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:07:53,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:53,360 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-25 18:07:53,361 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:07:53,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368338348] [2021-11-25 18:07:53,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [368338348] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:07:53,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2133017832] [2021-11-25 18:07:53,361 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:07:53,362 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:53,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:07:53,365 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:07:53,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 18:07:53,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:53,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 18:07:53,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:07:53,670 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-25 18:07:53,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:07:53,755 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-25 18:07:53,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2133017832] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:07:53,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2071259184] [2021-11-25 18:07:53,758 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:07:53,759 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:07:53,759 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:07:53,760 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:07:53,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:07:53,815 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:07:53,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:07:53,827 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 [2021-11-25 18:07:53,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:07:53,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:53,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:53,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:53,917 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:07:53,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:07:53,970 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 16 treesize of output 12 [2021-11-25 18:07:54,086 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:07:54,304 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6029#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:07:54,304 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:07:54,304 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:07:54,305 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2021-11-25 18:07:54,305 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071157976] [2021-11-25 18:07:54,305 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:07:54,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 18:07:54,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:07:54,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 18:07:54,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=687, Unknown=0, NotChecked=0, Total=870 [2021-11-25 18:07:54,306 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:54,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:07:54,564 INFO L93 Difference]: Finished difference Result 118 states and 133 transitions. [2021-11-25 18:07:54,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 18:07:54,564 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-25 18:07:54,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:07:54,565 INFO L225 Difference]: With dead ends: 118 [2021-11-25 18:07:54,565 INFO L226 Difference]: Without dead ends: 65 [2021-11-25 18:07:54,566 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=281, Invalid=1051, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 18:07:54,566 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 165 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:07:54,567 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 15 Invalid, 379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [165 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:07:54,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-25 18:07:54,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2021-11-25 18:07:54,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.1228070175438596) internal successors, (64), 57 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:54,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 64 transitions. [2021-11-25 18:07:54,583 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 64 transitions. Word has length 40 [2021-11-25 18:07:54,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:07:54,583 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 64 transitions. [2021-11-25 18:07:54,584 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:54,584 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 64 transitions. [2021-11-25 18:07:54,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-25 18:07:54,584 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:07:54,585 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:07:54,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 18:07:54,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:54,808 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:07:54,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:07:54,808 INFO L85 PathProgramCache]: Analyzing trace with hash 65272532, now seen corresponding path program 17 times [2021-11-25 18:07:54,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:07:54,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722692095] [2021-11-25 18:07:54,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:07:54,809 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:07:54,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:54,972 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 18:07:54,972 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:07:54,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722692095] [2021-11-25 18:07:54,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1722692095] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:07:54,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087851822] [2021-11-25 18:07:54,973 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:07:54,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:54,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:07:54,974 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:07:54,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 18:07:55,106 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 18:07:55,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:07:55,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 18:07:55,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:07:55,319 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 18:07:55,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:07:55,428 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 18:07:55,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087851822] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:07:55,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [362297209] [2021-11-25 18:07:55,430 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:07:55,431 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:07:55,431 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:07:55,431 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:07:55,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:07:55,494 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:07:55,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:07:55,549 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:07:55,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:07:55,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:07:55,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:55,618 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:07:55,641 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:07:55,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:07:55,710 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 16 treesize of output 12 [2021-11-25 18:07:55,823 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:07:56,067 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6647#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:07:56,067 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:07:56,067 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:07:56,068 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-25 18:07:56,068 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365632811] [2021-11-25 18:07:56,068 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:07:56,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 18:07:56,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:07:56,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 18:07:56,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=745, Unknown=0, NotChecked=0, Total=930 [2021-11-25 18:07:56,069 INFO L87 Difference]: Start difference. First operand 58 states and 64 transitions. Second operand has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:56,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:07:56,382 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2021-11-25 18:07:56,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 18:07:56,383 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-25 18:07:56,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:07:56,383 INFO L225 Difference]: With dead ends: 62 [2021-11-25 18:07:56,383 INFO L226 Difference]: Without dead ends: 45 [2021-11-25 18:07:56,384 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 107 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 510 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=301, Invalid=1259, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 18:07:56,384 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 192 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:07:56,385 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 13 Invalid, 434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [192 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:07:56,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-25 18:07:56,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-11-25 18:07:56,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:56,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2021-11-25 18:07:56,399 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 41 [2021-11-25 18:07:56,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:07:56,399 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2021-11-25 18:07:56,399 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:07:56,400 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2021-11-25 18:07:56,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 18:07:56,400 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:07:56,401 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:07:56,425 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-11-25 18:07:56,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:56,602 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:07:56,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:07:56,602 INFO L85 PathProgramCache]: Analyzing trace with hash 1775187002, now seen corresponding path program 18 times [2021-11-25 18:07:56,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:07:56,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233500675] [2021-11-25 18:07:56,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:07:56,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:07:56,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:07:59,913 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 1 proven. 139 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:07:59,913 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:07:59,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233500675] [2021-11-25 18:07:59,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233500675] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:07:59,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052862354] [2021-11-25 18:07:59,914 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:07:59,914 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:07:59,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:07:59,915 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:07:59,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 18:07:59,994 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:07:59,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:07:59,997 WARN L261 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 133 conjunts are in the unsatisfiable core [2021-11-25 18:07:59,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:08:03,267 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 139 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:08:03,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:08:08,913 INFO L354 Elim1Store]: treesize reduction 794, result has 40.2 percent of original size [2021-11-25 18:08:08,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 121 treesize of output 552 [2021-11-25 18:08:16,871 INFO L354 Elim1Store]: treesize reduction 1298, result has 2.2 percent of original size [2021-11-25 18:08:16,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 47 [2021-11-25 18:08:17,036 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 18:08:17,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2052862354] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:08:17,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1740411562] [2021-11-25 18:08:17,038 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:08:17,038 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:08:17,039 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:08:17,039 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:08:17,039 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:08:17,086 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:08:17,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:08:17,099 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 [2021-11-25 18:08:17,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:08:17,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:08:17,158 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:08:17,179 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:08:17,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:08:17,252 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 16 treesize of output 12 [2021-11-25 18:08:17,354 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:08:18,058 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7236#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:08:18,058 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:08:18,058 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:08:18,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 39, 34] total 107 [2021-11-25 18:08:18,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099608060] [2021-11-25 18:08:18,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:08:18,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-25 18:08:18,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:18,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-25 18:08:18,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=12039, Unknown=0, NotChecked=0, Total=12432 [2021-11-25 18:08:18,062 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 107 states, 107 states have (on average 1.102803738317757) internal successors, (118), 107 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:25,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:25,890 INFO L93 Difference]: Finished difference Result 79 states and 88 transitions. [2021-11-25 18:08:25,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-25 18:08:25,891 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.102803738317757) internal successors, (118), 107 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-25 18:08:25,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:25,891 INFO L225 Difference]: With dead ends: 79 [2021-11-25 18:08:25,891 INFO L226 Difference]: Without dead ends: 76 [2021-11-25 18:08:25,893 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 59 SyntacticMatches, 4 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4957 ImplicationChecksByTransitivity, 15.2s TimeCoverageRelationStatistics Valid=759, Invalid=19833, Unknown=0, NotChecked=0, Total=20592 [2021-11-25 18:08:25,894 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 5 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 3040 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 3135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 3040 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:25,894 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 261 Invalid, 3135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 3040 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 18:08:25,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-25 18:08:25,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 63. [2021-11-25 18:08:25,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.1290322580645162) internal successors, (70), 62 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:25,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 70 transitions. [2021-11-25 18:08:25,912 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 70 transitions. Word has length 44 [2021-11-25 18:08:25,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:25,913 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 70 transitions. [2021-11-25 18:08:25,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 1.102803738317757) internal successors, (118), 107 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:25,913 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 70 transitions. [2021-11-25 18:08:25,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 18:08:25,914 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:25,914 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:25,943 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 18:08:26,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:26,124 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:26,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:26,125 INFO L85 PathProgramCache]: Analyzing trace with hash -1967093956, now seen corresponding path program 19 times [2021-11-25 18:08:26,125 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:26,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362620009] [2021-11-25 18:08:26,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:26,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:26,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:26,305 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-25 18:08:26,305 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:26,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362620009] [2021-11-25 18:08:26,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [362620009] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:08:26,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118498911] [2021-11-25 18:08:26,306 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:08:26,306 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:26,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:08:26,307 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:08:26,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 18:08:26,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:26,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 18:08:26,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:08:26,588 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-25 18:08:26,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:08:26,672 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-25 18:08:26,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [118498911] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:08:26,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2008890530] [2021-11-25 18:08:26,674 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:08:26,674 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:08:26,674 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:08:26,675 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:08:26,675 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:08:26,720 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:08:26,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:08:26,759 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:08:26,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:08:26,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:08:26,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:08:26,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:08:26,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:08:26,847 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:08:26,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:08:26,888 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 16 treesize of output 12 [2021-11-25 18:08:26,988 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:08:27,633 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7865#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:08:27,633 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:08:27,633 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:08:27,633 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2021-11-25 18:08:27,633 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022525133] [2021-11-25 18:08:27,634 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:08:27,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 18:08:27,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:27,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 18:08:27,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=834, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 18:08:27,635 INFO L87 Difference]: Start difference. First operand 63 states and 70 transitions. Second operand has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:27,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:27,920 INFO L93 Difference]: Finished difference Result 132 states and 147 transitions. [2021-11-25 18:08:27,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 18:08:27,921 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-25 18:08:27,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:27,921 INFO L225 Difference]: With dead ends: 132 [2021-11-25 18:08:27,921 INFO L226 Difference]: Without dead ends: 72 [2021-11-25 18:08:27,922 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 96 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1077 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=346, Invalid=1294, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 18:08:27,923 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 39 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 266 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 266 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:27,923 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 15 Invalid, 466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [266 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:08:27,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-25 18:08:27,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 65. [2021-11-25 18:08:27,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.109375) internal successors, (71), 64 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:27,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 71 transitions. [2021-11-25 18:08:27,943 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 71 transitions. Word has length 45 [2021-11-25 18:08:27,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:27,944 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 71 transitions. [2021-11-25 18:08:27,944 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:27,944 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 71 transitions. [2021-11-25 18:08:27,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 18:08:27,945 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:27,945 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:27,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 18:08:28,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:28,172 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:28,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:28,173 INFO L85 PathProgramCache]: Analyzing trace with hash 976990629, now seen corresponding path program 20 times [2021-11-25 18:08:28,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:28,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356523849] [2021-11-25 18:08:28,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:28,173 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:28,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:28,361 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 18:08:28,361 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:28,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356523849] [2021-11-25 18:08:28,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [356523849] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:08:28,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [907116919] [2021-11-25 18:08:28,361 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:08:28,362 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:28,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:08:28,363 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:08:28,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 18:08:28,495 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 18:08:28,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:08:28,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 18:08:28,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:08:28,711 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 18:08:28,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:08:28,812 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-25 18:08:28,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [907116919] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:08:28,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1894578866] [2021-11-25 18:08:28,814 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:08:28,814 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:08:28,814 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:08:28,815 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:08:28,815 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:08:28,884 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:08:28,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:08:28,929 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:08:28,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:08:28,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:08:28,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:08:28,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:08:28,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:08:29,005 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:08:29,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:08:29,036 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 16 treesize of output 12 [2021-11-25 18:08:29,159 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:08:29,672 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8560#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:08:29,672 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:08:29,672 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:08:29,672 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-25 18:08:29,672 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209164458] [2021-11-25 18:08:29,672 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:08:29,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 18:08:29,673 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:29,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 18:08:29,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 18:08:29,673 INFO L87 Difference]: Start difference. First operand 65 states and 71 transitions. Second operand has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:30,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:30,010 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2021-11-25 18:08:30,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 18:08:30,011 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-25 18:08:30,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:30,012 INFO L225 Difference]: With dead ends: 69 [2021-11-25 18:08:30,012 INFO L226 Difference]: Without dead ends: 50 [2021-11-25 18:08:30,013 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 97 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1443 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=366, Invalid=1526, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 18:08:30,014 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 21 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 276 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 276 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:30,014 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 19 Invalid, 563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [276 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:08:30,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-25 18:08:30,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-25 18:08:30,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 49 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:30,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-11-25 18:08:30,027 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 46 [2021-11-25 18:08:30,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:30,027 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-11-25 18:08:30,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:08:30,027 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-11-25 18:08:30,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 18:08:30,028 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:30,028 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:30,052 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 18:08:30,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-25 18:08:30,228 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:30,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:30,229 INFO L85 PathProgramCache]: Analyzing trace with hash 424409865, now seen corresponding path program 21 times [2021-11-25 18:08:30,229 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:30,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934392663] [2021-11-25 18:08:30,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:30,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:30,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:34,490 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 10 proven. 170 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:08:34,490 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:34,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934392663] [2021-11-25 18:08:34,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934392663] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:08:34,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1354445761] [2021-11-25 18:08:34,490 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:08:34,490 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:34,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:08:34,492 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:08:34,493 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 18:08:34,593 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:08:34,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:08:34,598 WARN L261 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 151 conjunts are in the unsatisfiable core [2021-11-25 18:08:34,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:08:38,283 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 179 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:08:38,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:08:45,246 INFO L354 Elim1Store]: treesize reduction 1059, result has 39.7 percent of original size [2021-11-25 18:08:45,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 137 treesize of output 717 [2021-11-25 18:08:53,928 INFO L354 Elim1Store]: treesize reduction 1723, result has 1.9 percent of original size [2021-11-25 18:08:53,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 138 treesize of output 54 [2021-11-25 18:08:54,058 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 18:08:54,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1354445761] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:08:54,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [359215948] [2021-11-25 18:08:54,060 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:08:54,060 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:08:54,060 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:08:54,061 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:08:54,061 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:08:54,120 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:08:54,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:08:54,160 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:08:54,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:08:54,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:08:54,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:08:54,237 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:08:54,262 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:08:54,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:08:54,334 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 16 treesize of output 12 [2021-11-25 18:08:54,451 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:08:58,181 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9219#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:08:58,181 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:08:58,181 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:08:58,181 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 44, 38] total 121 [2021-11-25 18:08:58,181 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155655036] [2021-11-25 18:08:58,181 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:08:58,182 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2021-11-25 18:08:58,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:58,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2021-11-25 18:08:58,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=541, Invalid=15209, Unknown=0, NotChecked=0, Total=15750 [2021-11-25 18:08:58,184 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 121 states, 121 states have (on average 1.0909090909090908) internal successors, (132), 121 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:07,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:07,343 INFO L93 Difference]: Finished difference Result 87 states and 96 transitions. [2021-11-25 18:09:07,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-25 18:09:07,345 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 1.0909090909090908) internal successors, (132), 121 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-25 18:09:07,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:07,345 INFO L225 Difference]: With dead ends: 87 [2021-11-25 18:09:07,345 INFO L226 Difference]: Without dead ends: 84 [2021-11-25 18:09:07,346 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 38 SyntacticMatches, 31 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11445 ImplicationChecksByTransitivity, 20.3s TimeCoverageRelationStatistics Valid=987, Invalid=24773, Unknown=0, NotChecked=0, Total=25760 [2021-11-25 18:09:07,347 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 14 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 3197 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 3348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 3197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:07,348 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 241 Invalid, 3348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 3197 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2021-11-25 18:09:07,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-25 18:09:07,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 70. [2021-11-25 18:09:07,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.1159420289855073) internal successors, (77), 69 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:07,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2021-11-25 18:09:07,372 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 49 [2021-11-25 18:09:07,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:07,372 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2021-11-25 18:09:07,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 1.0909090909090908) internal successors, (132), 121 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:07,372 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2021-11-25 18:09:07,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 18:09:07,373 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:07,373 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:07,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 18:09:07,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:07,574 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:07,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:07,574 INFO L85 PathProgramCache]: Analyzing trace with hash -852919811, now seen corresponding path program 22 times [2021-11-25 18:09:07,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:07,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114821337] [2021-11-25 18:09:07,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:07,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:07,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:07,760 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-25 18:09:07,761 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:07,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114821337] [2021-11-25 18:09:07,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1114821337] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:09:07,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1453541810] [2021-11-25 18:09:07,761 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:09:07,762 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:07,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:09:07,763 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:09:07,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 18:09:07,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:07,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 18:09:07,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:09:08,077 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-25 18:09:08,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:09:08,163 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-25 18:09:08,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1453541810] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:09:08,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [910367080] [2021-11-25 18:09:08,164 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:09:08,164 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:09:08,164 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:09:08,164 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:09:08,165 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:09:08,206 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:09:08,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:09:08,249 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:09:08,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:09:08,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:09:08,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:09:08,306 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:09:08,327 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:09:08,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:09:08,399 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 16 treesize of output 12 [2021-11-25 18:09:08,496 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:09:08,688 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9917#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:09:08,688 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:09:08,689 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:09:08,689 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2021-11-25 18:09:08,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483353294] [2021-11-25 18:09:08,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:09:08,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-25 18:09:08,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:08,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-25 18:09:08,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=995, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 18:09:08,690 INFO L87 Difference]: Start difference. First operand 70 states and 77 transitions. Second operand has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:09,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:09,015 INFO L93 Difference]: Finished difference Result 146 states and 161 transitions. [2021-11-25 18:09:09,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 18:09:09,016 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-25 18:09:09,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:09,017 INFO L225 Difference]: With dead ends: 146 [2021-11-25 18:09:09,017 INFO L226 Difference]: Without dead ends: 79 [2021-11-25 18:09:09,017 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 545 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=418, Invalid=1562, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 18:09:09,018 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 27 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 214 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 214 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:09,018 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 17 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [214 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:09:09,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-25 18:09:09,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 72. [2021-11-25 18:09:09,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.0985915492957747) internal successors, (78), 71 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:09,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 78 transitions. [2021-11-25 18:09:09,034 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 78 transitions. Word has length 50 [2021-11-25 18:09:09,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:09,034 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 78 transitions. [2021-11-25 18:09:09,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:09,035 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 78 transitions. [2021-11-25 18:09:09,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 18:09:09,035 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:09,035 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:09,058 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 18:09:09,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-25 18:09:09,236 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:09,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:09,236 INFO L85 PathProgramCache]: Analyzing trace with hash -247109324, now seen corresponding path program 23 times [2021-11-25 18:09:09,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:09,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644704350] [2021-11-25 18:09:09,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:09,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:09,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:09,452 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-25 18:09:09,452 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:09,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644704350] [2021-11-25 18:09:09,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1644704350] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:09:09,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712238812] [2021-11-25 18:09:09,453 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:09:09,453 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:09,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:09:09,457 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:09:09,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 18:09:09,627 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 18:09:09,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:09:09,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 18:09:09,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:09:09,830 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-25 18:09:09,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:09:09,931 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-11-25 18:09:09,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1712238812] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:09:09,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1390222177] [2021-11-25 18:09:09,933 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:09:09,933 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:09:09,933 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:09:09,933 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:09:09,934 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:09:09,978 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:09:09,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:09:09,987 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 [2021-11-25 18:09:10,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:09:10,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:09:10,040 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:09:10,057 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:09:10,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:09:10,102 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 16 treesize of output 12 [2021-11-25 18:09:10,228 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:09:10,870 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10689#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:09:10,871 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:09:10,871 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:09:10,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-25 18:09:10,871 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067977423] [2021-11-25 18:09:10,871 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:09:10,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 18:09:10,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:10,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 18:09:10,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1067, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 18:09:10,873 INFO L87 Difference]: Start difference. First operand 72 states and 78 transitions. Second operand has 32 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:11,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:09:11,239 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2021-11-25 18:09:11,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 18:09:11,241 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-25 18:09:11,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:09:11,242 INFO L225 Difference]: With dead ends: 76 [2021-11-25 18:09:11,242 INFO L226 Difference]: Without dead ends: 55 [2021-11-25 18:09:11,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 109 SyntacticMatches, 29 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1781 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=438, Invalid=1818, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 18:09:11,243 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:09:11,244 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 19 Invalid, 621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:09:11,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-25 18:09:11,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-11-25 18:09:11,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 54 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:11,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2021-11-25 18:09:11,260 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 51 [2021-11-25 18:09:11,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:11,260 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2021-11-25 18:09:11,260 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:09:11,260 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2021-11-25 18:09:11,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-25 18:09:11,261 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:11,261 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:09:11,285 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-11-25 18:09:11,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:11,461 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:11,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:11,462 INFO L85 PathProgramCache]: Analyzing trace with hash 1248847450, now seen corresponding path program 24 times [2021-11-25 18:09:11,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:11,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330815185] [2021-11-25 18:09:11,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:11,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:11,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:16,990 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 21 proven. 204 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:09:16,990 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:16,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330815185] [2021-11-25 18:09:16,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330815185] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:09:16,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594464043] [2021-11-25 18:09:16,990 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:09:16,990 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:09:16,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:09:16,991 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:09:16,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 18:09:17,087 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:09:17,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:09:17,091 WARN L261 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 169 conjunts are in the unsatisfiable core [2021-11-25 18:09:17,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:09:21,919 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 224 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:09:21,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:09:31,310 INFO L354 Elim1Store]: treesize reduction 1362, result has 39.3 percent of original size [2021-11-25 18:09:31,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 155 treesize of output 906 [2021-11-25 18:09:48,069 INFO L354 Elim1Store]: treesize reduction 2208, result has 1.6 percent of original size [2021-11-25 18:09:48,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 154 treesize of output 59 [2021-11-25 18:09:48,221 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:09:48,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594464043] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:09:48,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1826856372] [2021-11-25 18:09:48,222 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:09:48,223 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:09:48,223 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:09:48,223 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:09:48,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:09:48,286 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:09:48,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:09:48,338 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:09:48,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:09:48,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:09:48,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:09:48,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:09:48,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:09:48,440 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:09:48,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:09:48,473 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 16 treesize of output 12 [2021-11-25 18:09:48,548 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:09:49,338 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11419#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:09:49,339 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:09:49,339 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:09:49,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 49, 42] total 135 [2021-11-25 18:09:49,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017549580] [2021-11-25 18:09:49,339 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:09:49,339 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 135 states [2021-11-25 18:09:49,339 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:49,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2021-11-25 18:09:49,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=671, Invalid=18789, Unknown=0, NotChecked=0, Total=19460 [2021-11-25 18:09:49,341 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 135 states, 135 states have (on average 1.0814814814814815) internal successors, (146), 135 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:10:01,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:01,485 INFO L93 Difference]: Finished difference Result 95 states and 104 transitions. [2021-11-25 18:10:01,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-25 18:10:01,486 INFO L78 Accepts]: Start accepts. Automaton has has 135 states, 135 states have (on average 1.0814814814814815) internal successors, (146), 135 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-25 18:10:01,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:01,487 INFO L225 Difference]: With dead ends: 95 [2021-11-25 18:10:01,487 INFO L226 Difference]: Without dead ends: 92 [2021-11-25 18:10:01,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 71 SyntacticMatches, 4 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10225 ImplicationChecksByTransitivity, 22.2s TimeCoverageRelationStatistics Valid=1198, Invalid=30664, Unknown=0, NotChecked=0, Total=31862 [2021-11-25 18:10:01,489 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 13 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 4535 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 321 SdHoareTripleChecker+Invalid, 4703 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 4535 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:01,490 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 321 Invalid, 4703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 4535 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2021-11-25 18:10:01,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-25 18:10:01,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 77. [2021-11-25 18:10:01,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.105263157894737) internal successors, (84), 76 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:10:01,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 84 transitions. [2021-11-25 18:10:01,517 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 84 transitions. Word has length 54 [2021-11-25 18:10:01,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:01,518 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 84 transitions. [2021-11-25 18:10:01,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 135 states, 135 states have (on average 1.0814814814814815) internal successors, (146), 135 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:10:01,518 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 84 transitions. [2021-11-25 18:10:01,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 18:10:01,519 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:01,519 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:10:01,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 18:10:01,720 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:10:01,720 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:10:01,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:01,720 INFO L85 PathProgramCache]: Analyzing trace with hash 2141033884, now seen corresponding path program 25 times [2021-11-25 18:10:01,721 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:10:01,721 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397524006] [2021-11-25 18:10:01,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:10:01,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:10:01,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:01,959 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-25 18:10:01,959 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:10:01,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397524006] [2021-11-25 18:10:01,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397524006] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:10:01,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [220620562] [2021-11-25 18:10:01,960 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:10:01,960 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:10:01,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:10:01,965 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:10:01,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 18:10:02,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:02,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 18:10:02,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:10:02,483 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-25 18:10:02,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:10:02,620 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-11-25 18:10:02,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [220620562] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:10:02,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1634582526] [2021-11-25 18:10:02,622 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:10:02,622 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:10:02,622 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:10:02,623 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:10:02,623 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:10:02,686 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:10:02,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:10:02,746 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:10:02,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:10:02,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:10:02,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:10:02,866 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:10:02,893 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:10:02,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:10:02,960 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 16 treesize of output 12 [2021-11-25 18:10:03,090 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:10:03,417 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12188#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:10:03,417 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:10:03,417 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:10:03,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2021-11-25 18:10:03,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869379305] [2021-11-25 18:10:03,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:10:03,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-25 18:10:03,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:10:03,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-25 18:10:03,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=1170, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 18:10:03,418 INFO L87 Difference]: Start difference. First operand 77 states and 84 transitions. Second operand has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:10:03,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:03,793 INFO L93 Difference]: Finished difference Result 160 states and 175 transitions. [2021-11-25 18:10:03,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 18:10:03,794 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-25 18:10:03,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:03,794 INFO L225 Difference]: With dead ends: 160 [2021-11-25 18:10:03,794 INFO L226 Difference]: Without dead ends: 86 [2021-11-25 18:10:03,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 645 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=497, Invalid=1855, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 18:10:03,795 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 313 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 313 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:03,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 17 Invalid, 602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [313 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:10:03,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-25 18:10:03,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 79. [2021-11-25 18:10:03,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0897435897435896) internal successors, (85), 78 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:10:03,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 85 transitions. [2021-11-25 18:10:03,818 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 85 transitions. Word has length 55 [2021-11-25 18:10:03,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:03,818 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 85 transitions. [2021-11-25 18:10:03,819 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:10:03,819 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 85 transitions. [2021-11-25 18:10:03,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-25 18:10:03,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:03,819 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:10:03,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-25 18:10:04,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-25 18:10:04,020 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:10:04,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:04,020 INFO L85 PathProgramCache]: Analyzing trace with hash -394686267, now seen corresponding path program 26 times [2021-11-25 18:10:04,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:10:04,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714303100] [2021-11-25 18:10:04,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:10:04,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:10:04,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:04,302 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-25 18:10:04,302 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:10:04,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714303100] [2021-11-25 18:10:04,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [714303100] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:10:04,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1587279726] [2021-11-25 18:10:04,302 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:10:04,302 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:10:04,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:10:04,303 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:10:04,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 18:10:04,456 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 18:10:04,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:10:04,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 18:10:04,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:10:04,720 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-25 18:10:04,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:10:04,824 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-25 18:10:04,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1587279726] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:10:04,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1311946091] [2021-11-25 18:10:04,826 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:10:04,826 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:10:04,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:10:04,827 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:10:04,827 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:10:04,896 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:10:04,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:10:04,904 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 [2021-11-25 18:10:04,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:10:04,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:10:04,956 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:10:04,975 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:10:04,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:10:05,016 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 16 treesize of output 12 [2021-11-25 18:10:05,131 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:10:05,888 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13037#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:10:05,889 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:10:05,889 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:10:05,889 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2021-11-25 18:10:05,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815397597] [2021-11-25 18:10:05,889 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:10:05,889 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 18:10:05,889 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:10:05,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 18:10:05,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1249, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 18:10:05,890 INFO L87 Difference]: Start difference. First operand 79 states and 85 transitions. Second operand has 35 states, 35 states have (on average 2.0) internal successors, (70), 35 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:10:06,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:06,254 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2021-11-25 18:10:06,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 18:10:06,254 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 35 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-25 18:10:06,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:06,255 INFO L225 Difference]: With dead ends: 83 [2021-11-25 18:10:06,255 INFO L226 Difference]: Without dead ends: 60 [2021-11-25 18:10:06,256 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 120 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2154 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=517, Invalid=2135, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 18:10:06,256 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 603 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:06,257 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 13 Invalid, 603 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:10:06,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-25 18:10:06,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-11-25 18:10:06,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0847457627118644) internal successors, (64), 59 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:10:06,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2021-11-25 18:10:06,273 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 56 [2021-11-25 18:10:06,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:06,274 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2021-11-25 18:10:06,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 35 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:10:06,274 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2021-11-25 18:10:06,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-25 18:10:06,275 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:06,275 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:10:06,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-25 18:10:06,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 18:10:06,488 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:10:06,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:06,489 INFO L85 PathProgramCache]: Analyzing trace with hash 2064065641, now seen corresponding path program 27 times [2021-11-25 18:10:06,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:10:06,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1677409482] [2021-11-25 18:10:06,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:10:06,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:10:06,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:14,004 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 13 proven. 262 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:10:14,004 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:10:14,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1677409482] [2021-11-25 18:10:14,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1677409482] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:10:14,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881642360] [2021-11-25 18:10:14,005 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:10:14,005 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:10:14,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:10:14,006 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:10:14,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-25 18:10:14,138 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:10:14,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:10:14,141 WARN L261 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 187 conjunts are in the unsatisfiable core [2021-11-25 18:10:14,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:10:20,921 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 274 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:10:20,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:10:34,626 INFO L354 Elim1Store]: treesize reduction 1703, result has 39.0 percent of original size [2021-11-25 18:10:34,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 171 treesize of output 1115 [2021-11-25 18:11:08,682 INFO L354 Elim1Store]: treesize reduction 2753, result has 1.5 percent of original size [2021-11-25 18:11:08,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 172 treesize of output 66 [2021-11-25 18:11:08,870 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 220 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 18:11:08,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [881642360] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:11:08,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [275806059] [2021-11-25 18:11:08,872 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:11:08,872 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:11:08,872 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:11:08,873 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:11:08,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:11:08,937 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:11:08,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:11:08,982 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:11:08,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:11:09,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:11:09,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:11:09,053 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:11:09,074 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:11:09,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:11:09,147 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 16 treesize of output 12 [2021-11-25 18:11:09,293 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:11:10,385 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13837#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:11:10,385 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:11:10,385 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:11:10,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 54, 46] total 149 [2021-11-25 18:11:10,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855341955] [2021-11-25 18:11:10,386 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:11:10,386 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 149 states [2021-11-25 18:11:10,386 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:11:10,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2021-11-25 18:11:10,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=688, Invalid=22874, Unknown=0, NotChecked=0, Total=23562 [2021-11-25 18:11:10,388 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 149 states, 149 states have (on average 1.0738255033557047) internal successors, (160), 149 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:11:28,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:11:28,364 INFO L93 Difference]: Finished difference Result 103 states and 112 transitions. [2021-11-25 18:11:28,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-25 18:11:28,364 INFO L78 Accepts]: Start accepts. Automaton has has 149 states, 149 states have (on average 1.0738255033557047) internal successors, (160), 149 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-25 18:11:28,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:11:28,365 INFO L225 Difference]: With dead ends: 103 [2021-11-25 18:11:28,365 INFO L226 Difference]: Without dead ends: 100 [2021-11-25 18:11:28,367 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11721 ImplicationChecksByTransitivity, 33.3s TimeCoverageRelationStatistics Valid=1490, Invalid=40330, Unknown=0, NotChecked=0, Total=41820 [2021-11-25 18:11:28,368 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 14 mSDsluCounter, 328 mSDsCounter, 0 mSdLazyCounter, 5094 mSolverCounterSat, 198 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 5292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 198 IncrementalHoareTripleChecker+Valid, 5094 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:11:28,368 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 330 Invalid, 5292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [198 Valid, 5094 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2021-11-25 18:11:28,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-25 18:11:28,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 84. [2021-11-25 18:11:28,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.0963855421686748) internal successors, (91), 83 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:11:28,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 91 transitions. [2021-11-25 18:11:28,394 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 91 transitions. Word has length 59 [2021-11-25 18:11:28,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:11:28,394 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 91 transitions. [2021-11-25 18:11:28,394 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 149 states, 149 states have (on average 1.0738255033557047) internal successors, (160), 149 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:11:28,395 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 91 transitions. [2021-11-25 18:11:28,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 18:11:28,395 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:11:28,395 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:11:28,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-25 18:11:28,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:11:28,596 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:11:28,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:11:28,596 INFO L85 PathProgramCache]: Analyzing trace with hash -1231103715, now seen corresponding path program 28 times [2021-11-25 18:11:28,597 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:11:28,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751570457] [2021-11-25 18:11:28,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:11:28,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:11:28,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:11:28,838 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-25 18:11:28,838 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:11:28,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751570457] [2021-11-25 18:11:28,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751570457] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:11:28,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882557763] [2021-11-25 18:11:28,839 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:11:28,839 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:11:28,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:11:28,846 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:11:28,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-25 18:11:28,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:11:28,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 18:11:28,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:11:29,255 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-25 18:11:29,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:11:29,372 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-25 18:11:29,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [882557763] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:11:29,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [505052686] [2021-11-25 18:11:29,374 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:11:29,374 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:11:29,375 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:11:29,375 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:11:29,375 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:11:29,451 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:11:29,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:11:29,459 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 [2021-11-25 18:11:29,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:11:29,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:11:29,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:11:29,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:11:29,569 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:11:29,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:11:29,623 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 16 treesize of output 12 [2021-11-25 18:11:29,743 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:11:30,731 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14693#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:11:30,731 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:11:30,731 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:11:30,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2021-11-25 18:11:30,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044965821] [2021-11-25 18:11:30,732 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:11:30,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-25 18:11:30,732 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:11:30,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-25 18:11:30,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1359, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 18:11:30,733 INFO L87 Difference]: Start difference. First operand 84 states and 91 transitions. Second operand has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:11:31,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:11:31,165 INFO L93 Difference]: Finished difference Result 174 states and 189 transitions. [2021-11-25 18:11:31,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 18:11:31,165 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-25 18:11:31,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:11:31,166 INFO L225 Difference]: With dead ends: 174 [2021-11-25 18:11:31,166 INFO L226 Difference]: Without dead ends: 93 [2021-11-25 18:11:31,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 129 SyntacticMatches, 33 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1908 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=583, Invalid=2173, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 18:11:31,167 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 326 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 326 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:11:31,167 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 21 Invalid, 740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [326 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:11:31,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-25 18:11:31,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 86. [2021-11-25 18:11:31,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.0823529411764705) internal successors, (92), 85 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:11:31,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 92 transitions. [2021-11-25 18:11:31,192 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 92 transitions. Word has length 60 [2021-11-25 18:11:31,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:11:31,193 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 92 transitions. [2021-11-25 18:11:31,193 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:11:31,193 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 92 transitions. [2021-11-25 18:11:31,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-25 18:11:31,194 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:11:31,194 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:11:31,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-25 18:11:31,394 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:11:31,395 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:11:31,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:11:31,395 INFO L85 PathProgramCache]: Analyzing trace with hash 889089940, now seen corresponding path program 29 times [2021-11-25 18:11:31,395 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:11:31,395 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1000637510] [2021-11-25 18:11:31,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:11:31,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:11:31,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:11:31,692 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-11-25 18:11:31,693 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:11:31,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1000637510] [2021-11-25 18:11:31,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1000637510] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:11:31,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1727916046] [2021-11-25 18:11:31,693 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:11:31,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:11:31,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:11:31,694 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:11:31,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 18:11:31,963 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-25 18:11:31,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:11:31,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 18:11:31,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:11:32,247 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-11-25 18:11:32,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:11:32,363 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-11-25 18:11:32,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1727916046] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:11:32,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1395121389] [2021-11-25 18:11:32,365 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:11:32,365 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:11:32,365 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:11:32,365 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:11:32,366 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:11:32,436 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:11:32,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:11:32,495 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:11:32,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:11:32,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:11:32,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:11:32,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:11:32,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:11:32,597 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:11:32,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:11:32,645 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 16 treesize of output 12 [2021-11-25 18:11:32,762 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:11:33,537 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15619#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:11:33,537 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:11:33,538 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:11:33,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2021-11-25 18:11:33,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875832000] [2021-11-25 18:11:33,538 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:11:33,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 18:11:33,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:11:33,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 18:11:33,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=1445, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 18:11:33,539 INFO L87 Difference]: Start difference. First operand 86 states and 92 transitions. Second operand has 38 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 38 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:11:33,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:11:33,948 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2021-11-25 18:11:33,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 18:11:33,949 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 38 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-25 18:11:33,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:11:33,949 INFO L225 Difference]: With dead ends: 90 [2021-11-25 18:11:33,949 INFO L226 Difference]: Without dead ends: 65 [2021-11-25 18:11:33,950 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 131 SyntacticMatches, 35 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2562 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=603, Invalid=2477, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 18:11:33,951 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 457 mSolverCounterSat, 234 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 691 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 234 IncrementalHoareTripleChecker+Valid, 457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:11:33,951 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 17 Invalid, 691 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [234 Valid, 457 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:11:33,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-25 18:11:33,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-11-25 18:11:33,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.078125) internal successors, (69), 64 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:11:33,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2021-11-25 18:11:33,976 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 61 [2021-11-25 18:11:33,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:11:33,976 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2021-11-25 18:11:33,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 38 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:11:33,976 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2021-11-25 18:11:33,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 18:11:33,976 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:11:33,976 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:11:33,998 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-25 18:11:34,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:11:34,180 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:11:34,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:11:34,181 INFO L85 PathProgramCache]: Analyzing trace with hash 824688762, now seen corresponding path program 30 times [2021-11-25 18:11:34,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:11:34,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1028762371] [2021-11-25 18:11:34,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:11:34,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:11:34,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:11:42,987 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:11:42,987 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:11:42,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1028762371] [2021-11-25 18:11:42,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1028762371] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:11:42,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1856940675] [2021-11-25 18:11:42,988 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:11:42,988 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:11:42,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:11:42,989 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:11:42,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-25 18:11:43,115 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:11:43,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:11:43,119 WARN L261 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 205 conjunts are in the unsatisfiable core [2021-11-25 18:11:43,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:11:51,315 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 329 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:11:51,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:12:10,404 WARN L227 SmtUtils]: Spent 5.57s on a formula simplification. DAG size of input: 981 DAG size of output: 541 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-25 18:12:10,408 INFO L354 Elim1Store]: treesize reduction 2082, result has 38.8 percent of original size [2021-11-25 18:12:10,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 188 treesize of output 1347 [2021-11-25 18:12:54,134 INFO L354 Elim1Store]: treesize reduction 3358, result has 1.3 percent of original size [2021-11-25 18:12:54,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 189 treesize of output 72 [2021-11-25 18:12:54,339 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-25 18:12:54,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1856940675] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:12:54,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1442806591] [2021-11-25 18:12:54,340 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:12:54,340 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:12:54,340 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:12:54,341 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:12:54,341 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:12:54,383 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:12:54,383 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:12:54,390 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 [2021-11-25 18:12:54,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:12:54,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:12:54,446 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:12:54,464 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:12:54,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:12:54,517 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 16 treesize of output 12 [2021-11-25 18:12:54,597 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:12:55,660 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16489#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:12:55,660 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:12:55,660 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:12:55,660 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 59, 50] total 163 [2021-11-25 18:12:55,661 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451817874] [2021-11-25 18:12:55,661 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:12:55,661 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2021-11-25 18:12:55,661 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:12:55,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2021-11-25 18:12:55,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=623, Invalid=27433, Unknown=0, NotChecked=0, Total=28056 [2021-11-25 18:12:55,663 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand has 163 states, 163 states have (on average 1.0674846625766872) internal successors, (174), 163 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:13:13,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:13:13,479 INFO L93 Difference]: Finished difference Result 111 states and 120 transitions. [2021-11-25 18:13:13,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-25 18:13:13,480 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 1.0674846625766872) internal successors, (174), 163 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-25 18:13:13,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:13:13,481 INFO L225 Difference]: With dead ends: 111 [2021-11-25 18:13:13,481 INFO L226 Difference]: Without dead ends: 108 [2021-11-25 18:13:13,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 83 SyntacticMatches, 4 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9818 ImplicationChecksByTransitivity, 38.7s TimeCoverageRelationStatistics Valid=1127, Invalid=42345, Unknown=0, NotChecked=0, Total=43472 [2021-11-25 18:13:13,485 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 10 mSDsluCounter, 386 mSDsCounter, 0 mSdLazyCounter, 6524 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 387 SdHoareTripleChecker+Invalid, 6627 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 6524 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:13:13,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 387 Invalid, 6627 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 6524 Invalid, 0 Unknown, 0 Unchecked, 5.8s Time] [2021-11-25 18:13:13,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-11-25 18:13:13,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 91. [2021-11-25 18:13:13,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.0888888888888888) internal successors, (98), 90 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:13:13,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2021-11-25 18:13:13,538 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 64 [2021-11-25 18:13:13,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:13:13,539 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2021-11-25 18:13:13,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 1.0674846625766872) internal successors, (174), 163 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:13:13,539 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2021-11-25 18:13:13,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 18:13:13,539 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:13:13,539 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:13:13,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-25 18:13:13,740 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:13:13,740 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:13:13,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:13:13,740 INFO L85 PathProgramCache]: Analyzing trace with hash 87604220, now seen corresponding path program 31 times [2021-11-25 18:13:13,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:13:13,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685376224] [2021-11-25 18:13:13,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:13:13,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:13:13,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:13:14,025 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2021-11-25 18:13:14,025 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:13:14,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685376224] [2021-11-25 18:13:14,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685376224] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:13:14,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823278269] [2021-11-25 18:13:14,026 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:13:14,026 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:13:14,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:13:14,032 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:13:14,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-25 18:13:14,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:13:14,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 18:13:14,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:13:14,558 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2021-11-25 18:13:14,558 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:13:14,660 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2021-11-25 18:13:14,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823278269] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:13:14,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1679242249] [2021-11-25 18:13:14,661 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:13:14,661 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:13:14,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:13:14,662 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:13:14,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:13:14,704 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:13:14,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:13:14,741 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:13:14,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:13:14,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:13:14,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:13:14,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:13:14,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:13:14,838 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:13:14,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:13:14,870 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 16 treesize of output 12 [2021-11-25 18:13:14,951 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:13:15,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17388#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:13:15,946 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:13:15,946 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:13:15,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2021-11-25 18:13:15,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841434328] [2021-11-25 18:13:15,947 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:13:15,947 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 18:13:15,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:13:15,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 18:13:15,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=1562, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 18:13:15,948 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:13:16,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:13:16,418 INFO L93 Difference]: Finished difference Result 188 states and 203 transitions. [2021-11-25 18:13:16,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 18:13:16,418 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-25 18:13:16,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:13:16,419 INFO L225 Difference]: With dead ends: 188 [2021-11-25 18:13:16,419 INFO L226 Difference]: Without dead ends: 100 [2021-11-25 18:13:16,419 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 140 SyntacticMatches, 36 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2237 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=676, Invalid=2516, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 18:13:16,419 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 453 mSolverCounterSat, 323 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 323 IncrementalHoareTripleChecker+Valid, 453 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:13:16,420 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 19 Invalid, 776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [323 Valid, 453 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:13:16,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-25 18:13:16,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 93. [2021-11-25 18:13:16,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.076086956521739) internal successors, (99), 92 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:13:16,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 99 transitions. [2021-11-25 18:13:16,472 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 99 transitions. Word has length 65 [2021-11-25 18:13:16,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:13:16,472 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 99 transitions. [2021-11-25 18:13:16,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:13:16,473 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 99 transitions. [2021-11-25 18:13:16,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 18:13:16,473 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:13:16,473 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:13:16,493 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-25 18:13:16,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-25 18:13:16,674 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:13:16,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:13:16,674 INFO L85 PathProgramCache]: Analyzing trace with hash 1815582693, now seen corresponding path program 32 times [2021-11-25 18:13:16,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:13:16,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1228732326] [2021-11-25 18:13:16,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:13:16,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:13:16,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:13:16,975 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-25 18:13:16,975 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:13:16,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1228732326] [2021-11-25 18:13:16,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1228732326] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:13:16,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1586825135] [2021-11-25 18:13:16,975 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:13:16,976 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:13:16,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:13:16,977 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:13:17,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-25 18:13:17,312 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-25 18:13:17,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:13:17,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 18:13:17,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:13:17,600 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-25 18:13:17,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:13:17,715 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-25 18:13:17,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1586825135] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:13:17,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [617998699] [2021-11-25 18:13:17,716 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:13:17,716 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:13:17,717 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:13:17,717 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:13:17,717 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:13:17,758 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:13:17,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:13:17,795 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:13:17,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:13:17,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:13:17,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:13:17,851 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:13:17,869 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:13:17,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:13:17,925 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 16 treesize of output 12 [2021-11-25 18:13:18,025 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:13:18,888 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18391#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:13:18,888 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:13:18,888 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:13:18,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2021-11-25 18:13:18,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374534508] [2021-11-25 18:13:18,889 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:13:18,889 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-25 18:13:18,889 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:13:18,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-25 18:13:18,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=415, Invalid=1655, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 18:13:18,890 INFO L87 Difference]: Start difference. First operand 93 states and 99 transitions. Second operand has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:13:19,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:13:19,310 INFO L93 Difference]: Finished difference Result 97 states and 103 transitions. [2021-11-25 18:13:19,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 18:13:19,311 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-25 18:13:19,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:13:19,311 INFO L225 Difference]: With dead ends: 97 [2021-11-25 18:13:19,311 INFO L226 Difference]: Without dead ends: 70 [2021-11-25 18:13:19,312 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 142 SyntacticMatches, 38 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3005 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=696, Invalid=2844, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 18:13:19,312 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 485 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 741 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 485 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:13:19,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 13 Invalid, 741 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 485 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:13:19,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-25 18:13:19,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-11-25 18:13:19,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.0724637681159421) internal successors, (74), 69 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:13:19,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 74 transitions. [2021-11-25 18:13:19,333 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 74 transitions. Word has length 66 [2021-11-25 18:13:19,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:13:19,334 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 74 transitions. [2021-11-25 18:13:19,334 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:13:19,334 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 74 transitions. [2021-11-25 18:13:19,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-25 18:13:19,334 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:13:19,334 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:13:19,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-25 18:13:19,534 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:13:19,535 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:13:19,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:13:19,550 INFO L85 PathProgramCache]: Analyzing trace with hash -1006180919, now seen corresponding path program 33 times [2021-11-25 18:13:19,550 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:13:19,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908114377] [2021-11-25 18:13:19,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:13:19,550 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:13:19,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:13:29,071 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 29 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:13:29,072 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:13:29,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908114377] [2021-11-25 18:13:29,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [908114377] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:13:29,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15103425] [2021-11-25 18:13:29,072 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:13:29,072 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:13:29,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:13:29,073 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:13:29,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-25 18:13:29,194 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:13:29,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:13:29,198 WARN L261 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 223 conjunts are in the unsatisfiable core [2021-11-25 18:13:29,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:13:38,131 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 389 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:13:38,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:13:58,948 WARN L227 SmtUtils]: Spent 7.77s on a formula simplification. DAG size of input: 1166 DAG size of output: 638 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-25 18:13:58,950 INFO L354 Elim1Store]: treesize reduction 2499, result has 38.6 percent of original size [2021-11-25 18:13:58,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 24 select indices, 24 select index equivalence classes, 0 disjoint index pairs (out of 276 index pairs), introduced 24 new quantified variables, introduced 276 case distinctions, treesize of input 205 treesize of output 1601 [2021-11-25 18:14:33,493 INFO L354 Elim1Store]: treesize reduction 4023, result has 1.2 percent of original size [2021-11-25 18:14:33,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 24 select indices, 24 select index equivalence classes, 0 disjoint index pairs (out of 276 index pairs), introduced 24 new quantified variables, introduced 276 case distinctions, treesize of input 206 treesize of output 78 [2021-11-25 18:14:33,709 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 312 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-25 18:14:33,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15103425] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:14:33,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1674265184] [2021-11-25 18:14:33,710 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:14:33,711 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:14:33,711 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:14:33,711 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:14:33,711 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:14:33,751 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:14:33,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:14:33,789 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:14:33,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:14:33,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:14:33,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:14:33,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:14:33,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:14:33,868 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:14:33,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:14:33,899 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 16 treesize of output 12 [2021-11-25 18:14:34,020 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:14:42,046 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19331#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:14:42,046 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:14:42,046 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:14:42,046 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 64, 54] total 177 [2021-11-25 18:14:42,046 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844559528] [2021-11-25 18:14:42,047 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:14:42,047 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 177 states [2021-11-25 18:14:42,047 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:14:42,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 177 interpolants. [2021-11-25 18:14:42,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=972, Invalid=31970, Unknown=0, NotChecked=0, Total=32942 [2021-11-25 18:14:42,050 INFO L87 Difference]: Start difference. First operand 70 states and 74 transitions. Second operand has 177 states, 177 states have (on average 1.0621468926553672) internal successors, (188), 177 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:15:04,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:15:04,690 INFO L93 Difference]: Finished difference Result 119 states and 128 transitions. [2021-11-25 18:15:04,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-11-25 18:15:04,691 INFO L78 Accepts]: Start accepts. Automaton has has 177 states, 177 states have (on average 1.0621468926553672) internal successors, (188), 177 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-25 18:15:04,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:15:04,692 INFO L225 Difference]: With dead ends: 119 [2021-11-25 18:15:04,692 INFO L226 Difference]: Without dead ends: 116 [2021-11-25 18:15:04,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 50 SyntacticMatches, 43 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24205 ImplicationChecksByTransitivity, 49.5s TimeCoverageRelationStatistics Valid=1872, Invalid=54534, Unknown=0, NotChecked=0, Total=56406 [2021-11-25 18:15:04,694 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 18 mSDsluCounter, 380 mSDsCounter, 0 mSdLazyCounter, 6734 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 6913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 6734 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:15:04,694 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 379 Invalid, 6913 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 6734 Invalid, 0 Unknown, 0 Unchecked, 7.0s Time] [2021-11-25 18:15:04,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-25 18:15:04,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 98. [2021-11-25 18:15:04,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.0824742268041236) internal successors, (105), 97 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:15:04,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 105 transitions. [2021-11-25 18:15:04,730 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 105 transitions. Word has length 69 [2021-11-25 18:15:04,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:15:04,730 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 105 transitions. [2021-11-25 18:15:04,731 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 177 states, 177 states have (on average 1.0621468926553672) internal successors, (188), 177 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:15:04,731 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 105 transitions. [2021-11-25 18:15:04,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 18:15:04,731 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:15:04,731 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:15:04,752 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-25 18:15:04,932 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-25 18:15:04,932 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:15:04,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:15:04,932 INFO L85 PathProgramCache]: Analyzing trace with hash 117301309, now seen corresponding path program 34 times [2021-11-25 18:15:04,932 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:15:04,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262314249] [2021-11-25 18:15:04,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:15:04,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:15:04,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:15:05,258 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2021-11-25 18:15:05,259 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:15:05,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262314249] [2021-11-25 18:15:05,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [262314249] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:15:05,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2036188818] [2021-11-25 18:15:05,259 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:15:05,259 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:15:05,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:15:05,260 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:15:05,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-25 18:15:05,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:15:05,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 396 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 18:15:05,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:15:05,816 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2021-11-25 18:15:05,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:15:05,928 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2021-11-25 18:15:05,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2036188818] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:15:05,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1283256810] [2021-11-25 18:15:05,929 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:15:05,929 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:15:05,929 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:15:05,929 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:15:05,929 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:15:05,976 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:15:05,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:15:05,984 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 [2021-11-25 18:15:06,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:15:06,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:15:06,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:15:06,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:15:06,049 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:15:06,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:15:06,112 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 16 treesize of output 12 [2021-11-25 18:15:06,205 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:15:06,494 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20323#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:15:06,494 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:15:06,494 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:15:06,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2021-11-25 18:15:06,494 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964360404] [2021-11-25 18:15:06,494 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:15:06,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 18:15:06,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:15:06,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 18:15:06,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=1779, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 18:15:06,496 INFO L87 Difference]: Start difference. First operand 98 states and 105 transitions. Second operand has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:15:07,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:15:07,067 INFO L93 Difference]: Finished difference Result 202 states and 217 transitions. [2021-11-25 18:15:07,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-25 18:15:07,068 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-25 18:15:07,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:15:07,068 INFO L225 Difference]: With dead ends: 202 [2021-11-25 18:15:07,068 INFO L226 Difference]: Without dead ends: 107 [2021-11-25 18:15:07,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 993 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=776, Invalid=2884, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 18:15:07,069 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 37 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 515 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 922 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 515 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:15:07,069 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 11 Invalid, 922 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [515 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:15:07,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-25 18:15:07,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 100. [2021-11-25 18:15:07,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.0707070707070707) internal successors, (106), 99 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:15:07,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 106 transitions. [2021-11-25 18:15:07,104 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 106 transitions. Word has length 70 [2021-11-25 18:15:07,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:15:07,104 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 106 transitions. [2021-11-25 18:15:07,104 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:15:07,105 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 106 transitions. [2021-11-25 18:15:07,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 18:15:07,105 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:15:07,105 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:15:07,132 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-25 18:15:07,312 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:15:07,313 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:15:07,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:15:07,313 INFO L85 PathProgramCache]: Analyzing trace with hash -1851191820, now seen corresponding path program 35 times [2021-11-25 18:15:07,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:15:07,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [389816891] [2021-11-25 18:15:07,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:15:07,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:15:07,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:15:07,636 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-25 18:15:07,636 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:15:07,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [389816891] [2021-11-25 18:15:07,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [389816891] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:15:07,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1136210711] [2021-11-25 18:15:07,636 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:15:07,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:15:07,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:15:07,637 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:15:07,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-25 18:15:07,897 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 18:15:07,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:15:07,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 18:15:07,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:15:08,295 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-25 18:15:08,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:15:08,456 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-25 18:15:08,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1136210711] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:15:08,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1514916503] [2021-11-25 18:15:08,457 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:15:08,457 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:15:08,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:15:08,457 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:15:08,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:15:08,498 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:15:08,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:15:08,536 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:15:08,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:15:08,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:15:08,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:15:08,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:15:08,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:15:08,605 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:15:08,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:15:08,636 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 16 treesize of output 12 [2021-11-25 18:15:08,730 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:15:08,969 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21403#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:15:08,969 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:15:08,969 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:15:08,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2021-11-25 18:15:08,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414372186] [2021-11-25 18:15:08,970 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:15:08,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-25 18:15:08,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:15:08,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-25 18:15:08,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=473, Invalid=1879, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 18:15:08,971 INFO L87 Difference]: Start difference. First operand 100 states and 106 transitions. Second operand has 44 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 44 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:15:09,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:15:09,503 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2021-11-25 18:15:09,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-25 18:15:09,504 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 44 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-25 18:15:09,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:15:09,504 INFO L225 Difference]: With dead ends: 104 [2021-11-25 18:15:09,504 INFO L226 Difference]: Without dead ends: 75 [2021-11-25 18:15:09,505 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 192 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1377 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=796, Invalid=3236, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 18:15:09,505 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 672 mSolverCounterSat, 227 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 899 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 227 IncrementalHoareTripleChecker+Valid, 672 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:15:09,505 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 21 Invalid, 899 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [227 Valid, 672 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:15:09,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-25 18:15:09,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-25 18:15:09,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0675675675675675) internal successors, (79), 74 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:15:09,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2021-11-25 18:15:09,531 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 71 [2021-11-25 18:15:09,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:15:09,531 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2021-11-25 18:15:09,531 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 44 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:15:09,531 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2021-11-25 18:15:09,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 18:15:09,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:15:09,531 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:15:09,553 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-25 18:15:09,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:15:09,732 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:15:09,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:15:09,732 INFO L85 PathProgramCache]: Analyzing trace with hash -1036205414, now seen corresponding path program 36 times [2021-11-25 18:15:09,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:15:09,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1959834570] [2021-11-25 18:15:09,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:15:09,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:15:09,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:15:20,657 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 28 proven. 427 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:15:20,658 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:15:20,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1959834570] [2021-11-25 18:15:20,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1959834570] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:15:20,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867911101] [2021-11-25 18:15:20,658 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:15:20,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:15:20,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:15:20,660 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:15:20,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-25 18:15:20,796 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:15:20,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:15:20,800 WARN L261 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 241 conjunts are in the unsatisfiable core [2021-11-25 18:15:20,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:15:30,738 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 454 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:15:30,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:15:56,754 WARN L227 SmtUtils]: Spent 10.74s on a formula simplification. DAG size of input: 1367 DAG size of output: 743 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-25 18:15:56,757 INFO L354 Elim1Store]: treesize reduction 2954, result has 38.5 percent of original size [2021-11-25 18:15:56,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 26 select indices, 26 select index equivalence classes, 0 disjoint index pairs (out of 325 index pairs), introduced 26 new quantified variables, introduced 325 case distinctions, treesize of input 222 treesize of output 1877 [2021-11-25 18:16:43,853 INFO L354 Elim1Store]: treesize reduction 4748, result has 1.1 percent of original size [2021-11-25 18:16:43,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 26 select indices, 26 select index equivalence classes, 0 disjoint index pairs (out of 325 index pairs), introduced 26 new quantified variables, introduced 325 case distinctions, treesize of input 223 treesize of output 84 [2021-11-25 18:16:44,067 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 364 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-25 18:16:44,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867911101] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:16:44,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [187180391] [2021-11-25 18:16:44,068 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:16:44,068 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:16:44,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:16:44,068 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:16:44,068 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:16:44,113 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:16:44,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:16:44,120 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 [2021-11-25 18:16:44,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:16:44,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:16:44,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:16:44,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:16:44,183 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:16:44,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:16:44,216 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 16 treesize of output 12 [2021-11-25 18:16:44,299 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:16:52,908 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22413#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:16:52,909 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:16:52,909 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:16:52,909 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 69, 58] total 191 [2021-11-25 18:16:52,909 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841656084] [2021-11-25 18:16:52,909 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:16:52,909 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 191 states [2021-11-25 18:16:52,910 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:16:52,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 191 interpolants. [2021-11-25 18:16:52,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1107, Invalid=37113, Unknown=0, NotChecked=0, Total=38220 [2021-11-25 18:16:52,912 INFO L87 Difference]: Start difference. First operand 75 states and 79 transitions. Second operand has 191 states, 191 states have (on average 1.057591623036649) internal successors, (202), 191 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:17:18,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:17:18,534 INFO L93 Difference]: Finished difference Result 127 states and 136 transitions. [2021-11-25 18:17:18,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-11-25 18:17:18,541 INFO L78 Accepts]: Start accepts. Automaton has has 191 states, 191 states have (on average 1.057591623036649) internal successors, (202), 191 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-25 18:17:18,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:17:18,542 INFO L225 Difference]: With dead ends: 127 [2021-11-25 18:17:18,542 INFO L226 Difference]: Without dead ends: 124 [2021-11-25 18:17:18,544 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 53 SyntacticMatches, 46 SemanticMatches, 248 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29599 ImplicationChecksByTransitivity, 55.3s TimeCoverageRelationStatistics Valid=2107, Invalid=60143, Unknown=0, NotChecked=0, Total=62250 [2021-11-25 18:17:18,545 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 10 mSDsluCounter, 405 mSDsCounter, 0 mSdLazyCounter, 7717 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 7926 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 7717 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:17:18,545 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 403 Invalid, 7926 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 7717 Invalid, 0 Unknown, 0 Unchecked, 8.4s Time] [2021-11-25 18:17:18,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-25 18:17:18,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 105. [2021-11-25 18:17:18,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0769230769230769) internal successors, (112), 104 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:17:18,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 112 transitions. [2021-11-25 18:17:18,587 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 112 transitions. Word has length 74 [2021-11-25 18:17:18,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:17:18,587 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 112 transitions. [2021-11-25 18:17:18,588 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 191 states, 191 states have (on average 1.057591623036649) internal successors, (202), 191 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:17:18,588 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 112 transitions. [2021-11-25 18:17:18,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 18:17:18,589 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:17:18,589 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:17:18,613 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-25 18:17:18,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-25 18:17:18,800 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:17:18,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:17:18,801 INFO L85 PathProgramCache]: Analyzing trace with hash 514587228, now seen corresponding path program 37 times [2021-11-25 18:17:18,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:17:18,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420338901] [2021-11-25 18:17:18,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:18,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:17:18,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:19,165 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 92 proven. 104 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2021-11-25 18:17:19,165 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:17:19,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420338901] [2021-11-25 18:17:19,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420338901] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:17:19,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807519619] [2021-11-25 18:17:19,166 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:17:19,166 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:17:19,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:17:19,168 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:17:19,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-25 18:17:19,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:19,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 18:17:19,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:17:19,761 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2021-11-25 18:17:19,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:17:19,881 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2021-11-25 18:17:19,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807519619] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:17:19,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [846329877] [2021-11-25 18:17:19,882 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:17:19,882 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:17:19,883 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:17:19,883 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:17:19,883 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:17:19,932 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:17:19,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:17:19,970 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:17:19,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:17:19,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 18:17:20,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:17:20,025 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:17:20,043 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:17:20,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-25 18:17:20,097 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 16 treesize of output 12 [2021-11-25 18:17:20,215 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:17:20,448 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23464#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:17:20,448 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:17:20,448 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:17:20,448 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 46 [2021-11-25 18:17:20,448 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660725194] [2021-11-25 18:17:20,448 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:17:20,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-25 18:17:20,449 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:17:20,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-25 18:17:20,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=2010, Unknown=0, NotChecked=0, Total=2550 [2021-11-25 18:17:20,449 INFO L87 Difference]: Start difference. First operand 105 states and 112 transitions. Second operand has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:17:20,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:17:20,990 INFO L93 Difference]: Finished difference Result 216 states and 231 transitions. [2021-11-25 18:17:20,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-25 18:17:20,990 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-25 18:17:20,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:17:20,991 INFO L225 Difference]: With dead ends: 216 [2021-11-25 18:17:20,991 INFO L226 Difference]: Without dead ends: 114 [2021-11-25 18:17:20,992 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 204 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1125 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=883, Invalid=3277, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 18:17:20,992 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 37 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 442 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 947 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 442 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:17:20,992 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 17 Invalid, 947 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [442 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:17:20,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-25 18:17:21,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 107. [2021-11-25 18:17:21,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.0660377358490567) internal successors, (113), 106 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:17:21,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 113 transitions. [2021-11-25 18:17:21,035 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 113 transitions. Word has length 75 [2021-11-25 18:17:21,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:17:21,035 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 113 transitions. [2021-11-25 18:17:21,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:17:21,036 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 113 transitions. [2021-11-25 18:17:21,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-25 18:17:21,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:17:21,037 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:17:21,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-25 18:17:21,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-25 18:17:21,252 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:17:21,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:17:21,253 INFO L85 PathProgramCache]: Analyzing trace with hash -1992571131, now seen corresponding path program 38 times [2021-11-25 18:17:21,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:17:21,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824848759] [2021-11-25 18:17:21,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:21,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:17:21,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:21,607 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2021-11-25 18:17:21,607 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:17:21,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824848759] [2021-11-25 18:17:21,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824848759] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:17:21,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885582438] [2021-11-25 18:17:21,608 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:17:21,608 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:17:21,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:17:21,609 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:17:21,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-25 18:17:21,858 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 18:17:21,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:17:21,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-25 18:17:21,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:17:22,243 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 105 proven. 105 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2021-11-25 18:17:22,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:17:22,687 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2021-11-25 18:17:22,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885582438] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:17:22,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [787721482] [2021-11-25 18:17:22,688 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 18:17:22,688 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:17:22,689 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:17:22,689 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:17:22,689 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:17:22,729 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-25 18:17:22,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-25 18:17:22,767 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-25 18:17:22,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-25 18:17:22,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:17:22,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:17:22,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:17:22,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:17:22,835 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:17:22,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-25 18:17:22,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:17:22,942 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:17:23,156 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24636#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:17:23,157 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:17:23,157 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:17:23,157 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32, 31] total 62 [2021-11-25 18:17:23,157 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673657817] [2021-11-25 18:17:23,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:17:23,157 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-25 18:17:23,158 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:17:23,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-25 18:17:23,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1045, Invalid=3377, Unknown=0, NotChecked=0, Total=4422 [2021-11-25 18:17:23,159 INFO L87 Difference]: Start difference. First operand 107 states and 113 transitions. Second operand has 62 states, 62 states have (on average 1.7096774193548387) internal successors, (106), 62 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:17:23,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:17:23,957 INFO L93 Difference]: Finished difference Result 111 states and 117 transitions. [2021-11-25 18:17:23,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-25 18:17:23,958 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.7096774193548387) internal successors, (106), 62 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-25 18:17:23,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:17:23,958 INFO L225 Difference]: With dead ends: 111 [2021-11-25 18:17:23,958 INFO L226 Difference]: Without dead ends: 80 [2021-11-25 18:17:23,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 191 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2968 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2024, Invalid=6906, Unknown=0, NotChecked=0, Total=8930 [2021-11-25 18:17:23,959 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 21 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 597 mSolverCounterSat, 427 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 1024 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 427 IncrementalHoareTripleChecker+Valid, 597 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:17:23,960 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 15 Invalid, 1024 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [427 Valid, 597 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:17:23,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-25 18:17:24,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-11-25 18:17:24,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0632911392405062) internal successors, (84), 79 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:17:24,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2021-11-25 18:17:24,005 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 76 [2021-11-25 18:17:24,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:17:24,006 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2021-11-25 18:17:24,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.7096774193548387) internal successors, (106), 62 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:17:24,006 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2021-11-25 18:17:24,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-25 18:17:24,007 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:17:24,007 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:17:24,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-25 18:17:24,212 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:17:24,212 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:17:24,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:17:24,213 INFO L85 PathProgramCache]: Analyzing trace with hash -605733079, now seen corresponding path program 39 times [2021-11-25 18:17:24,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:17:24,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31267738] [2021-11-25 18:17:24,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:24,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:17:24,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:38,311 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 55 proven. 470 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:17:38,311 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:17:38,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31267738] [2021-11-25 18:17:38,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31267738] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:17:38,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [710053491] [2021-11-25 18:17:38,311 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:17:38,311 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:17:38,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:17:38,312 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:17:38,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5fc3092-1522-4844-9aa8-90a66cdf3fcf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-25 18:17:38,458 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:17:38,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:17:38,463 WARN L261 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 259 conjunts are in the unsatisfiable core [2021-11-25 18:17:38,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:17:51,797 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 0 proven. 524 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:17:51,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:18:24,909 WARN L227 SmtUtils]: Spent 14.24s on a formula simplification. DAG size of input: 1584 DAG size of output: 856 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-25 18:18:24,912 INFO L354 Elim1Store]: treesize reduction 3447, result has 38.3 percent of original size [2021-11-25 18:18:24,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 28 select indices, 28 select index equivalence classes, 0 disjoint index pairs (out of 378 index pairs), introduced 28 new quantified variables, introduced 378 case distinctions, treesize of input 240 treesize of output 2176