./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-lopstr16/break-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-lopstr16/break-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash af12e42a5d3a022d66b7920ff01dec158b3de4df470747e943653bc7f1da2cc9 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:35:38,533 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:35:38,536 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:35:38,568 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:35:38,568 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:35:38,570 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:35:38,571 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:35:38,574 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:35:38,576 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:35:38,577 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:35:38,579 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:35:38,580 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:35:38,581 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:35:38,582 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:35:38,584 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:35:38,586 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:35:38,587 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:35:38,588 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:35:38,591 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:35:38,593 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:35:38,596 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:35:38,597 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:35:38,599 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:35:38,600 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:35:38,607 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:35:38,609 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:35:38,610 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:35:38,611 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:35:38,611 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:35:38,613 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:35:38,613 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:35:38,614 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:35:38,615 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:35:38,616 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:35:38,617 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:35:38,617 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:35:38,618 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:35:38,618 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:35:38,618 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:35:38,619 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:35:38,619 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:35:38,620 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:35:38,647 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:35:38,647 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:35:38,648 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:35:38,648 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:35:38,649 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:35:38,649 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:35:38,649 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:35:38,649 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:35:38,650 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:35:38,650 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:35:38,650 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:35:38,650 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:35:38,650 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:35:38,651 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:35:38,651 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:35:38,651 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:35:38,651 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:35:38,651 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:35:38,652 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:35:38,652 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:35:38,653 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:35:38,653 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:35:38,653 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:35:38,653 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:35:38,653 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:35:38,654 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:35:38,654 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:35:38,654 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:35:38,654 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:35:38,654 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:35:38,655 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:35:38,655 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:35:38,655 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:35:38,655 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:35:38,655 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:35:38,656 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:35:38,656 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:35:38,656 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:35:38,656 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:35:38,656 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:35:38,657 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:35:38,657 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_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> af12e42a5d3a022d66b7920ff01dec158b3de4df470747e943653bc7f1da2cc9 [2021-11-20 23:35:38,923 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:35:38,956 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:35:38,959 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:35:38,960 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:35:38,961 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:35:38,962 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-lopstr16/break-2.i [2021-11-20 23:35:39,055 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/data/d52536111/695bfde6d1b347b2ac037f98c815321b/FLAGb271ce57b [2021-11-20 23:35:39,596 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:35:39,596 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/sv-benchmarks/c/array-lopstr16/break-2.i [2021-11-20 23:35:39,606 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/data/d52536111/695bfde6d1b347b2ac037f98c815321b/FLAGb271ce57b [2021-11-20 23:35:39,952 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/data/d52536111/695bfde6d1b347b2ac037f98c815321b [2021-11-20 23:35:39,954 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:35:39,956 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:35:39,957 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:35:39,958 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:35:39,961 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:35:39,962 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:35:39" (1/1) ... [2021-11-20 23:35:39,963 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f83294c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:39, skipping insertion in model container [2021-11-20 23:35:39,963 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:35:39" (1/1) ... [2021-11-20 23:35:39,970 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:35:39,984 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:35:40,175 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_32423920-aa9e-4ee9-9ea0-9581d2bdac00/sv-benchmarks/c/array-lopstr16/break-2.i[800,813] [2021-11-20 23:35:40,188 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:35:47,781 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:35:47,794 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_32423920-aa9e-4ee9-9ea0-9581d2bdac00/sv-benchmarks/c/array-lopstr16/break-2.i[800,813] [2021-11-20 23:35:47,799 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:35:47,818 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:35:47,818 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47 WrapperNode [2021-11-20 23:35:47,819 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:35:47,820 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:35:47,820 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:35:47,820 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:35:47,828 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47" (1/1) ... [2021-11-20 23:35:47,835 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47" (1/1) ... [2021-11-20 23:35:47,853 INFO L137 Inliner]: procedures = 14, calls = 10, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 43 [2021-11-20 23:35:47,853 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:35:47,854 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:35:47,854 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:35:47,855 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:35:47,864 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47" (1/1) ... [2021-11-20 23:35:47,864 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47" (1/1) ... [2021-11-20 23:35:47,865 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47" (1/1) ... [2021-11-20 23:35:47,866 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47" (1/1) ... [2021-11-20 23:35:47,870 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47" (1/1) ... [2021-11-20 23:35:47,874 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47" (1/1) ... [2021-11-20 23:35:47,876 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47" (1/1) ... [2021-11-20 23:35:47,877 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:35:47,878 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:35:47,879 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:35:47,879 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:35:47,880 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47" (1/1) ... [2021-11-20 23:35:47,887 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:35:47,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:47,917 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:35:47,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:35:47,961 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:35:47,961 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:35:47,962 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:35:47,962 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:35:47,962 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:35:47,962 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:35:48,031 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:35:48,033 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:35:48,151 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:35:48,171 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:35:48,172 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-20 23:35:48,174 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:35:48 BoogieIcfgContainer [2021-11-20 23:35:48,175 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:35:48,176 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:35:48,176 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:35:48,182 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:35:48,182 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:35:39" (1/3) ... [2021-11-20 23:35:48,183 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@460eff51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:35:48, skipping insertion in model container [2021-11-20 23:35:48,183 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47" (2/3) ... [2021-11-20 23:35:48,184 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@460eff51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:35:48, skipping insertion in model container [2021-11-20 23:35:48,184 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:35:48" (3/3) ... [2021-11-20 23:35:48,185 INFO L111 eAbstractionObserver]: Analyzing ICFG break-2.i [2021-11-20 23:35:48,191 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:35:48,191 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:35:48,300 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:35:48,308 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 23:35:48,323 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:35:48,349 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:48,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-20 23:35:48,354 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:48,355 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:48,355 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:48,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:48,365 INFO L85 PathProgramCache]: Analyzing trace with hash 696685750, now seen corresponding path program 1 times [2021-11-20 23:35:48,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:48,375 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962483858] [2021-11-20 23:35:48,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:48,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:48,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:48,519 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:48,519 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:48,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962483858] [2021-11-20 23:35:48,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1962483858] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:35:48,521 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:35:48,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:35:48,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740574876] [2021-11-20 23:35:48,524 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:35:48,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:35:48,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:48,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:35:48,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:35:48,567 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:48,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:48,660 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2021-11-20 23:35:48,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:35:48,663 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 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 7 [2021-11-20 23:35:48,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:48,671 INFO L225 Difference]: With dead ends: 30 [2021-11-20 23:35:48,672 INFO L226 Difference]: Without dead ends: 20 [2021-11-20 23:35:48,675 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:35:48,683 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 7 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:48,685 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 11 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:35:48,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-20 23:35:48,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 15. [2021-11-20 23:35:48,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:48,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-11-20 23:35:48,726 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 7 [2021-11-20 23:35:48,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:48,727 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-11-20 23:35:48,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:48,728 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-11-20 23:35:48,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 23:35:48,729 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:48,729 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:48,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:35:48,730 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:48,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:48,735 INFO L85 PathProgramCache]: Analyzing trace with hash -732647900, now seen corresponding path program 1 times [2021-11-20 23:35:48,735 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:48,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902019451] [2021-11-20 23:35:48,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:48,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:48,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:48,815 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:48,816 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:48,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902019451] [2021-11-20 23:35:48,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902019451] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:48,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [13544902] [2021-11-20 23:35:48,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:48,818 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:48,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:48,827 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:48,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:35:48,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:48,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:35:48,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:48,988 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:48,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:49,050 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:49,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [13544902] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:49,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [911304671] [2021-11-20 23:35:49,081 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-20 23:35:49,081 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:49,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:49,091 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:49,093 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:49,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2021-11-20 23:35:49,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 33 [2021-11-20 23:35:49,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:49,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 178 treesize of output 168 [2021-11-20 23:35:50,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:35:50,241 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 [2021-11-20 23:35:50,299 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:50,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [911304671] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:35:50,573 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:50,574 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 3] total 8 [2021-11-20 23:35:50,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294150414] [2021-11-20 23:35:50,575 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:35:50,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:35:50,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:50,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:35:50,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-11-20 23:35:50,577 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.25) 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) [2021-11-20 23:35:50,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:50,609 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2021-11-20 23:35:50,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:35:50,610 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) 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 [2021-11-20 23:35:50,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:50,611 INFO L225 Difference]: With dead ends: 25 [2021-11-20 23:35:50,611 INFO L226 Difference]: Without dead ends: 15 [2021-11-20 23:35:50,612 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-11-20 23:35:50,613 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:50,614 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 9 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:35:50,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-20 23:35:50,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-20 23:35:50,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:50,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2021-11-20 23:35:50,619 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2021-11-20 23:35:50,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:50,620 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2021-11-20 23:35:50,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) 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) [2021-11-20 23:35:50,620 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2021-11-20 23:35:50,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-20 23:35:50,621 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:50,621 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:50,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:50,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:50,847 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:50,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:50,848 INFO L85 PathProgramCache]: Analyzing trace with hash -1124265805, now seen corresponding path program 1 times [2021-11-20 23:35:50,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:50,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1188998215] [2021-11-20 23:35:50,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:50,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:50,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:50,897 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:50,897 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:50,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1188998215] [2021-11-20 23:35:50,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1188998215] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:50,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [962812326] [2021-11-20 23:35:50,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:50,898 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:50,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:50,911 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:50,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:35:50,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:50,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:35:50,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:50,983 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:50,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:51,020 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:51,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [962812326] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:51,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1765490930] [2021-11-20 23:35:51,024 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-20 23:35:51,025 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:51,025 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:51,025 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:51,026 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:51,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2021-11-20 23:35:51,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 23:35:51,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 173 treesize of output 163 [2021-11-20 23:35:51,785 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 [2021-11-20 23:35:52,088 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 [2021-11-20 23:35:52,120 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:52,475 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:52,475 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:52,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-20 23:35:52,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306035608] [2021-11-20 23:35:52,476 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:52,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:35:52,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:52,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:35:52,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=100, Unknown=0, NotChecked=0, Total=156 [2021-11-20 23:35:52,478 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:52,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:52,556 INFO L93 Difference]: Finished difference Result 53 states and 62 transitions. [2021-11-20 23:35:52,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:35:52,556 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-20 23:35:52,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:52,559 INFO L225 Difference]: With dead ends: 53 [2021-11-20 23:35:52,560 INFO L226 Difference]: Without dead ends: 43 [2021-11-20 23:35:52,560 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=56, Invalid=100, Unknown=0, NotChecked=0, Total=156 [2021-11-20 23:35:52,562 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 30 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:52,563 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 23 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:35:52,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-20 23:35:52,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 36. [2021-11-20 23:35:52,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 35 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:52,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-11-20 23:35:52,578 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 10 [2021-11-20 23:35:52,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:52,578 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-11-20 23:35:52,578 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:52,578 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-11-20 23:35:52,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 23:35:52,579 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:52,579 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:52,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:52,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-20 23:35:52,780 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:52,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:52,781 INFO L85 PathProgramCache]: Analyzing trace with hash -1620966743, now seen corresponding path program 2 times [2021-11-20 23:35:52,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:52,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155498096] [2021-11-20 23:35:52,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:52,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:52,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:52,870 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:52,871 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:52,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155498096] [2021-11-20 23:35:52,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1155498096] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:52,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282918488] [2021-11-20 23:35:52,871 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:35:52,872 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:52,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:52,873 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:52,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:35:52,921 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 23:35:52,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:35:52,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 23:35:52,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:52,974 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:52,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:53,068 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:53,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282918488] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:53,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1490562793] [2021-11-20 23:35:53,074 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-20 23:35:53,074 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:53,075 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:53,075 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:53,075 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:53,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2021-11-20 23:35:53,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 23:35:53,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:53,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 173 treesize of output 163 [2021-11-20 23:35:54,002 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 [2021-11-20 23:35:54,377 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 [2021-11-20 23:35:54,401 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:54,868 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:54,868 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:54,869 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-20 23:35:54,869 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180405487] [2021-11-20 23:35:54,869 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:54,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 23:35:54,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:54,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 23:35:54,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=211, Unknown=0, NotChecked=0, Total=342 [2021-11-20 23:35:54,875 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:55,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:55,012 INFO L93 Difference]: Finished difference Result 122 states and 140 transitions. [2021-11-20 23:35:55,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 23:35:55,013 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-20 23:35:55,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:55,018 INFO L225 Difference]: With dead ends: 122 [2021-11-20 23:35:55,018 INFO L226 Difference]: Without dead ends: 97 [2021-11-20 23:35:55,020 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=131, Invalid=211, Unknown=0, NotChecked=0, Total=342 [2021-11-20 23:35:55,023 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 174 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:55,029 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 47 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:35:55,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-20 23:35:55,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 78. [2021-11-20 23:35:55,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.155844155844156) internal successors, (89), 77 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:55,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 89 transitions. [2021-11-20 23:35:55,051 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 89 transitions. Word has length 16 [2021-11-20 23:35:55,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:55,051 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 89 transitions. [2021-11-20 23:35:55,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:55,052 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 89 transitions. [2021-11-20 23:35:55,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:35:55,053 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:55,053 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:55,091 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:55,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:55,267 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:55,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:55,267 INFO L85 PathProgramCache]: Analyzing trace with hash -1321806571, now seen corresponding path program 3 times [2021-11-20 23:35:55,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:55,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357132745] [2021-11-20 23:35:55,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:55,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:55,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:55,460 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:55,460 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:55,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357132745] [2021-11-20 23:35:55,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1357132745] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:55,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123857071] [2021-11-20 23:35:55,461 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:35:55,461 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:55,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:55,462 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:55,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:35:55,510 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:35:55,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:35:55,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 23:35:55,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:55,612 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:55,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:55,874 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:55,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2123857071] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:55,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2005477300] [2021-11-20 23:35:55,877 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-20 23:35:55,878 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:55,878 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:55,878 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:55,879 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:55,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2021-11-20 23:35:56,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 33 [2021-11-20 23:35:56,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 178 treesize of output 168 [2021-11-20 23:35:56,555 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 [2021-11-20 23:35:56,866 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 [2021-11-20 23:35:56,887 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:57,198 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:57,199 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:57,199 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-20 23:35:57,199 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799850538] [2021-11-20 23:35:57,199 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:57,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-20 23:35:57,200 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:57,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-20 23:35:57,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=389, Invalid=541, Unknown=0, NotChecked=0, Total=930 [2021-11-20 23:35:57,201 INFO L87 Difference]: Start difference. First operand 78 states and 89 transitions. Second operand has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 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) [2021-11-20 23:35:57,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:57,499 INFO L93 Difference]: Finished difference Result 260 states and 296 transitions. [2021-11-20 23:35:57,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 23:35:57,499 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 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) Word has length 28 [2021-11-20 23:35:57,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:57,504 INFO L225 Difference]: With dead ends: 260 [2021-11-20 23:35:57,504 INFO L226 Difference]: Without dead ends: 205 [2021-11-20 23:35:57,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=389, Invalid=541, Unknown=0, NotChecked=0, Total=930 [2021-11-20 23:35:57,506 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 366 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 366 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:57,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [366 Valid, 95 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:35:57,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-11-20 23:35:57,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 162. [2021-11-20 23:35:57,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.1490683229813665) internal successors, (185), 161 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:57,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 185 transitions. [2021-11-20 23:35:57,555 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 185 transitions. Word has length 28 [2021-11-20 23:35:57,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:57,556 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 185 transitions. [2021-11-20 23:35:57,556 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 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) [2021-11-20 23:35:57,556 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 185 transitions. [2021-11-20 23:35:57,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:35:57,559 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:57,560 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:57,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:57,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:57,775 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:57,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:57,776 INFO L85 PathProgramCache]: Analyzing trace with hash -117001235, now seen corresponding path program 4 times [2021-11-20 23:35:57,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:57,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853897565] [2021-11-20 23:35:57,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:57,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:57,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:58,219 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:58,220 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:58,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853897565] [2021-11-20 23:35:58,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853897565] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:58,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449235962] [2021-11-20 23:35:58,221 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:35:58,221 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:58,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:58,222 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:58,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:35:58,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:58,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:35:58,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:58,432 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:58,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:59,241 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:59,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449235962] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:59,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [74250154] [2021-11-20 23:35:59,260 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-20 23:35:59,260 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:59,261 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:59,261 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:59,261 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:59,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2021-11-20 23:35:59,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 33 [2021-11-20 23:35:59,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:59,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 178 treesize of output 168 [2021-11-20 23:36:00,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:36:00,361 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 [2021-11-20 23:36:00,400 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:00,742 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:00,743 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:00,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2021-11-20 23:36:00,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234623918] [2021-11-20 23:36:00,743 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:00,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-20 23:36:00,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:00,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-20 23:36:00,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1337, Invalid=1633, Unknown=0, NotChecked=0, Total=2970 [2021-11-20 23:36:00,747 INFO L87 Difference]: Start difference. First operand 162 states and 185 transitions. Second operand has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:01,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:01,502 INFO L93 Difference]: Finished difference Result 536 states and 608 transitions. [2021-11-20 23:36:01,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-20 23:36:01,503 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 0 states have call successors, (0), 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 52 [2021-11-20 23:36:01,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:01,506 INFO L225 Difference]: With dead ends: 536 [2021-11-20 23:36:01,507 INFO L226 Difference]: Without dead ends: 421 [2021-11-20 23:36:01,510 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 577 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1337, Invalid=1633, Unknown=0, NotChecked=0, Total=2970 [2021-11-20 23:36:01,511 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 1038 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 225 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1038 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 225 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:01,512 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1038 Valid, 187 Invalid, 464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [225 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:36:01,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2021-11-20 23:36:01,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 330. [2021-11-20 23:36:01,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 329 states have (on average 1.1458966565349544) internal successors, (377), 329 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:01,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 377 transitions. [2021-11-20 23:36:01,554 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 377 transitions. Word has length 52 [2021-11-20 23:36:01,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:01,555 INFO L470 AbstractCegarLoop]: Abstraction has 330 states and 377 transitions. [2021-11-20 23:36:01,555 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:01,555 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 377 transitions. [2021-11-20 23:36:01,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-20 23:36:01,558 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:01,558 INFO L514 BasicCegarLoop]: trace histogram [47, 46, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:01,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:01,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:01,775 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:01,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:01,776 INFO L85 PathProgramCache]: Analyzing trace with hash -1395435107, now seen corresponding path program 5 times [2021-11-20 23:36:01,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:01,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819321534] [2021-11-20 23:36:01,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:01,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:01,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:02,924 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:02,924 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:02,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819321534] [2021-11-20 23:36:02,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [819321534] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:02,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [469835741] [2021-11-20 23:36:02,925 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:36:02,925 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:02,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:02,926 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:02,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:38:50,786 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2021-11-20 23:38:50,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:50,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-20 23:38:50,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:51,287 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:51,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:53,934 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:53,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [469835741] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:53,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1286926965] [2021-11-20 23:38:53,937 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-20 23:38:53,937 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:53,937 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:53,938 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:53,938 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:53,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2021-11-20 23:38:54,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 23:38:54,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:54,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 173 treesize of output 163 [2021-11-20 23:38:54,537 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 [2021-11-20 23:38:54,842 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 [2021-11-20 23:38:54,850 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:55,263 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:55,264 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:55,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 96 [2021-11-20 23:38:55,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016416306] [2021-11-20 23:38:55,264 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:55,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-20 23:38:55,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:55,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-20 23:38:55,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4961, Invalid=5545, Unknown=0, NotChecked=0, Total=10506 [2021-11-20 23:38:55,271 INFO L87 Difference]: Start difference. First operand 330 states and 377 transitions. Second operand has 97 states, 97 states have (on average 2.0412371134020617) internal successors, (198), 96 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:57,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:57,940 INFO L93 Difference]: Finished difference Result 1088 states and 1232 transitions. [2021-11-20 23:38:57,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-20 23:38:57,941 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 2.0412371134020617) internal successors, (198), 96 states have internal predecessors, (198), 0 states have call successors, (0), 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 100 [2021-11-20 23:38:57,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:57,946 INFO L225 Difference]: With dead ends: 1088 [2021-11-20 23:38:57,946 INFO L226 Difference]: Without dead ends: 853 [2021-11-20 23:38:57,951 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 245 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1177 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4961, Invalid=5545, Unknown=0, NotChecked=0, Total=10506 [2021-11-20 23:38:57,952 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 2268 mSDsluCounter, 376 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 478 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2268 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 966 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 478 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:57,952 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2268 Valid, 383 Invalid, 966 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [478 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:38:57,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 853 states. [2021-11-20 23:38:57,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 853 to 666. [2021-11-20 23:38:57,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 666 states, 665 states have (on average 1.1443609022556391) internal successors, (761), 665 states have internal predecessors, (761), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:57,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 666 states to 666 states and 761 transitions. [2021-11-20 23:38:57,992 INFO L78 Accepts]: Start accepts. Automaton has 666 states and 761 transitions. Word has length 100 [2021-11-20 23:38:57,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:57,993 INFO L470 AbstractCegarLoop]: Abstraction has 666 states and 761 transitions. [2021-11-20 23:38:57,993 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 2.0412371134020617) internal successors, (198), 96 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:57,994 INFO L276 IsEmpty]: Start isEmpty. Operand 666 states and 761 transitions. [2021-11-20 23:38:57,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2021-11-20 23:38:57,997 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:57,997 INFO L514 BasicCegarLoop]: trace histogram [95, 94, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:58,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:58,197 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-20 23:38:58,198 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:58,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:58,198 INFO L85 PathProgramCache]: Analyzing trace with hash 2109752573, now seen corresponding path program 6 times [2021-11-20 23:38:58,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:58,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1199003440] [2021-11-20 23:38:58,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:58,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:58,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:01,591 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:01,591 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:01,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1199003440] [2021-11-20 23:39:01,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1199003440] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:01,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855592863] [2021-11-20 23:39:01,591 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:39:01,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:01,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:01,592 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:01,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_32423920-aa9e-4ee9-9ea0-9581d2bdac00/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:39:01,703 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:39:01,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:01,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 517 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-20 23:39:01,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:02,199 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:02,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:11,263 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:11,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855592863] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:11,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [609339006] [2021-11-20 23:39:11,265 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-20 23:39:11,265 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:11,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:11,266 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:11,266 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:11,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2021-11-20 23:39:11,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 23:39:11,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:11,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 173 treesize of output 163 [2021-11-20 23:39:11,800 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 [2021-11-20 23:39:12,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:39:12,034 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:12,490 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:12,491 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:12,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 192 [2021-11-20 23:39:12,491 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978588173] [2021-11-20 23:39:12,491 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:12,492 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2021-11-20 23:39:12,492 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:12,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2021-11-20 23:39:12,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19121, Invalid=20281, Unknown=0, NotChecked=0, Total=39402 [2021-11-20 23:39:12,508 INFO L87 Difference]: Start difference. First operand 666 states and 761 transitions. Second operand has 193 states, 193 states have (on average 2.0207253886010363) internal successors, (390), 192 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)