./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_two_index_09.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_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/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_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_two_index_09.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/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_ed878e31-4e33-433e-8f98-1bb486296797/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 c10901f6cd435bfce49587e6dcf9dfedb0e3885a1bcbcf1013c88383e8232647 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:35:45,765 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:35:45,768 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:35:45,826 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:35:45,827 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:35:45,828 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:35:45,830 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:35:45,833 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:35:45,835 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:35:45,837 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:35:45,838 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:35:45,840 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:35:45,840 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:35:45,842 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:35:45,843 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:35:45,845 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:35:45,846 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:35:45,848 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:35:45,850 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:35:45,854 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:35:45,856 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:35:45,858 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:35:45,860 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:35:45,861 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:35:45,865 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:35:45,866 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:35:45,866 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:35:45,867 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:35:45,868 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:35:45,869 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:35:45,870 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:35:45,871 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:35:45,872 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:35:45,873 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:35:45,875 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:35:45,875 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:35:45,876 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:35:45,877 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:35:45,877 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:35:45,878 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:35:45,879 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:35:45,881 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:35:45,907 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:35:45,907 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:35:45,908 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:35:45,908 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:35:45,909 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:35:45,909 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:35:45,909 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:35:45,910 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:35:45,910 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:35:45,910 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:35:45,910 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:35:45,910 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:35:45,911 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:35:45,911 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:35:45,911 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:35:45,911 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:35:45,912 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:35:45,912 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:35:45,913 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:35:45,913 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:35:45,913 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:35:45,913 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:35:45,914 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:35:45,914 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:35:45,914 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:35:45,914 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:35:45,915 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:35:45,915 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:35:45,915 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:35:45,915 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:35:45,915 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:35:45,916 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:35:45,916 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:35:45,916 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:35:45,916 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:35:45,917 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:35:45,917 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:35:45,917 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:35:45,917 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:35:45,918 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:35:45,918 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:35:45,918 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_ed878e31-4e33-433e-8f98-1bb486296797/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c10901f6cd435bfce49587e6dcf9dfedb0e3885a1bcbcf1013c88383e8232647 [2021-11-20 23:35:46,209 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:35:46,239 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:35:46,242 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:35:46,244 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:35:46,245 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:35:46,246 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-examples/standard_two_index_09.i [2021-11-20 23:35:46,320 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/data/ee3ab7b5a/59869e1872304ef290722562d7807385/FLAGddb737cf7 [2021-11-20 23:35:46,790 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:35:46,791 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/sv-benchmarks/c/array-examples/standard_two_index_09.i [2021-11-20 23:35:46,797 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/data/ee3ab7b5a/59869e1872304ef290722562d7807385/FLAGddb737cf7 [2021-11-20 23:35:47,164 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/data/ee3ab7b5a/59869e1872304ef290722562d7807385 [2021-11-20 23:35:47,167 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:35:47,168 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:35:47,170 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:35:47,170 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:35:47,173 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:35:47,174 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:35:47" (1/1) ... [2021-11-20 23:35:47,175 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@701f9b47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47, skipping insertion in model container [2021-11-20 23:35:47,176 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:35:47" (1/1) ... [2021-11-20 23:35:47,183 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:35:47,197 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:35:47,326 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_ed878e31-4e33-433e-8f98-1bb486296797/sv-benchmarks/c/array-examples/standard_two_index_09.i[814,827] [2021-11-20 23:35:47,338 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:35:47,344 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:35:47,356 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_ed878e31-4e33-433e-8f98-1bb486296797/sv-benchmarks/c/array-examples/standard_two_index_09.i[814,827] [2021-11-20 23:35:47,363 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:35:47,377 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:35:47,377 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47 WrapperNode [2021-11-20 23:35:47,378 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:35:47,391 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:35:47,391 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:35:47,391 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:35:47,399 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47" (1/1) ... [2021-11-20 23:35:47,406 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:47" (1/1) ... [2021-11-20 23:35:47,444 INFO L137 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2021-11-20 23:35:47,444 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:35:47,445 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:35:47,445 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:35:47,445 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:35:47,457 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 23:35:47,460 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 23:35:47,469 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 23:35:47,476 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 23:35:47,481 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 23:35:47,487 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 23:35:47,492 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 23:35:47,494 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:35:47,495 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:35:47,496 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:35:47,496 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:35:47,497 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 23:35:47,506 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:35:47,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:47,541 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:35:47,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:35:47,607 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:35:47,608 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:35:47,608 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:35:47,608 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:35:47,608 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:35:47,608 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:35:47,609 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:35:47,609 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:35:47,683 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:35:47,685 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:35:47,869 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:35:47,892 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:35:47,892 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-20 23:35:47,894 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:35:47 BoogieIcfgContainer [2021-11-20 23:35:47,895 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:35:47,896 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:35:47,897 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:35:47,900 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:35:47,900 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:35:47" (1/3) ... [2021-11-20 23:35:47,901 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76b18b20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:35:47, skipping insertion in model container [2021-11-20 23:35:47,901 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 23:35:47,902 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76b18b20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:35:47, skipping insertion in model container [2021-11-20 23:35:47,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:35:47" (3/3) ... [2021-11-20 23:35:47,903 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_two_index_09.i [2021-11-20 23:35:47,909 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:35:47,909 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:35:47,985 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:35:48,012 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 23:35:48,012 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:35:48,031 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 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 23:35:48,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 23:35:48,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:48,037 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-20 23:35:48,037 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:48,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:48,043 INFO L85 PathProgramCache]: Analyzing trace with hash -1745982706, now seen corresponding path program 1 times [2021-11-20 23:35:48,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:48,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981044220] [2021-11-20 23:35:48,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:48,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:48,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:48,230 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 23:35:48,231 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:48,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981044220] [2021-11-20 23:35:48,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981044220] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:35:48,233 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:35:48,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:35:48,235 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194696744] [2021-11-20 23:35:48,236 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:35:48,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:35:48,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:48,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:35:48,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:35:48,274 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 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 2.0) internal successors, (6), 2 states have internal predecessors, (6), 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 23:35:48,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:48,311 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2021-11-20 23:35:48,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:35:48,314 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 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 6 [2021-11-20 23:35:48,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:48,323 INFO L225 Difference]: With dead ends: 17 [2021-11-20 23:35:48,323 INFO L226 Difference]: Without dead ends: 9 [2021-11-20 23:35:48,326 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 23:35:48,331 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:48,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:35:48,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-20 23:35:48,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-20 23:35:48,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:48,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2021-11-20 23:35:48,366 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2021-11-20 23:35:48,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:48,367 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2021-11-20 23:35:48,367 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 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 23:35:48,367 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2021-11-20 23:35:48,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-20 23:35:48,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:48,368 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:48,368 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:35:48,369 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:48,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:48,370 INFO L85 PathProgramCache]: Analyzing trace with hash 276578033, now seen corresponding path program 1 times [2021-11-20 23:35:48,370 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:48,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860959320] [2021-11-20 23:35:48,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:48,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:48,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:48,420 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 23:35:48,420 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:48,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860959320] [2021-11-20 23:35:48,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [860959320] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:48,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026803148] [2021-11-20 23:35:48,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:48,422 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:48,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:48,424 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:48,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:35:48,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:48,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:35:48,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:48,552 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:35:48,552 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:35:48,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026803148] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:35:48,553 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:35:48,553 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 4 [2021-11-20 23:35:48,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301226301] [2021-11-20 23:35:48,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:35:48,555 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:35:48,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:48,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:35:48,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:35:48,557 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 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 23:35:48,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:48,580 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2021-11-20 23:35:48,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:35:48,582 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 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 23:35:48,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:48,583 INFO L225 Difference]: With dead ends: 20 [2021-11-20 23:35:48,583 INFO L226 Difference]: Without dead ends: 15 [2021-11-20 23:35:48,583 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:35:48,585 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:48,586 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 6 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:35:48,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-20 23:35:48,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 10. [2021-11-20 23:35:48,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 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 23:35:48,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2021-11-20 23:35:48,590 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2021-11-20 23:35:48,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:48,590 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2021-11-20 23:35:48,591 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 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 23:35:48,591 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2021-11-20 23:35:48,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-20 23:35:48,591 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:48,591 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:48,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:48,820 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:48,821 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:48,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:48,821 INFO L85 PathProgramCache]: Analyzing trace with hash -51261225, now seen corresponding path program 1 times [2021-11-20 23:35:48,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:48,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947495965] [2021-11-20 23:35:48,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:48,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:48,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:48,866 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:35:48,867 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:48,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947495965] [2021-11-20 23:35:48,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1947495965] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:48,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1541120858] [2021-11-20 23:35:48,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:48,868 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:48,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:48,869 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:48,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:35:48,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:48,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:35:48,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:48,994 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:35:48,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:49,058 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:35:49,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1541120858] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:49,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1243724483] [2021-11-20 23:35:49,088 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:35:49,089 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:49,096 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:49,102 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:49,103 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:49,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:49,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:49,286 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 23:35:49,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-20 23:35:49,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:49,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:49,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:49,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:49,411 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:35:49,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 23:35:49,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:49,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:35:49,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:49,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:49,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:49,814 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:35:49,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 234 [2021-11-20 23:35:50,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:35:50,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:50,293 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 23:35:50,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:50,438 INFO L354 Elim1Store]: treesize reduction 131, result has 21.6 percent of original size [2021-11-20 23:35:50,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 62 treesize of output 81 [2021-11-20 23:35:50,609 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-20 23:35:50,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:50,881 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:51,082 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:51,082 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:51,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-20 23:35:51,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184561851] [2021-11-20 23:35:51,083 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:51,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:35:51,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:51,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:35:51,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2021-11-20 23:35:51,084 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:51,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:51,129 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2021-11-20 23:35:51,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:35:51,130 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-20 23:35:51,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:51,132 INFO L225 Difference]: With dead ends: 31 [2021-11-20 23:35:51,132 INFO L226 Difference]: Without dead ends: 24 [2021-11-20 23:35:51,134 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2021-11-20 23:35:51,141 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:51,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 12 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:35:51,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-20 23:35:51,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 14. [2021-11-20 23:35:51,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 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 23:35:51,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-11-20 23:35:51,151 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 8 [2021-11-20 23:35:51,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:51,152 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-11-20 23:35:51,153 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:51,153 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-11-20 23:35:51,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 23:35:51,153 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:51,154 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:51,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:51,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:51,375 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:51,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:51,376 INFO L85 PathProgramCache]: Analyzing trace with hash 490227022, now seen corresponding path program 2 times [2021-11-20 23:35:51,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:51,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1920005990] [2021-11-20 23:35:51,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:51,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:51,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:51,462 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:35:51,462 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:51,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1920005990] [2021-11-20 23:35:51,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1920005990] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:51,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1811378788] [2021-11-20 23:35:51,466 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:35:51,467 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:51,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:51,468 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:51,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:35:51,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:35:51,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:35:51,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:35:51,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:51,560 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:35:51,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:51,602 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:35:51,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1811378788] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:51,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1259664319] [2021-11-20 23:35:51,611 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:35:51,611 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:51,612 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:51,612 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:51,612 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:51,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,686 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 23:35:51,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-20 23:35:51,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,750 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:35:51,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 23:35:51,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:35:51,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,994 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:35:52,017 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:35:52,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 236 treesize of output 235 [2021-11-20 23:35:52,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:35:52,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:52,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:52,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:52,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:52,627 INFO L354 Elim1Store]: treesize reduction 125, result has 25.1 percent of original size [2021-11-20 23:35:52,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 65 treesize of output 87 [2021-11-20 23:35:52,749 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-20 23:35:52,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:52,963 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:53,126 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:53,127 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:53,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-11-20 23:35:53,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783821566] [2021-11-20 23:35:53,127 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:53,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-20 23:35:53,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:53,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-20 23:35:53,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2021-11-20 23:35:53,129 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:53,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:53,190 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2021-11-20 23:35:53,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 23:35:53,191 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-20 23:35:53,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:53,192 INFO L225 Difference]: With dead ends: 54 [2021-11-20 23:35:53,192 INFO L226 Difference]: Without dead ends: 46 [2021-11-20 23:35:53,192 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2021-11-20 23:35:53,193 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 44 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:53,194 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 18 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:35:53,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-20 23:35:53,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 20. [2021-11-20 23:35:53,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 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 23:35:53,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-11-20 23:35:53,199 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 12 [2021-11-20 23:35:53,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:53,199 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-11-20 23:35:53,200 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:53,200 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-11-20 23:35:53,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-20 23:35:53,200 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:53,200 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:53,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:53,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:53,413 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:53,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:53,413 INFO L85 PathProgramCache]: Analyzing trace with hash 1077845166, now seen corresponding path program 3 times [2021-11-20 23:35:53,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:53,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514922978] [2021-11-20 23:35:53,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:53,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:53,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:53,533 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:35:53,533 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:53,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514922978] [2021-11-20 23:35:53,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [514922978] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:53,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [352469070] [2021-11-20 23:35:53,535 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:35:53,535 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:53,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:53,548 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:53,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:35:53,595 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:35:53,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:35:53,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:35:53,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:53,700 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:35:53,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:53,836 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:35:53,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [352469070] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:53,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [806075991] [2021-11-20 23:35:53,840 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:35:53,840 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:53,841 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:53,841 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:53,841 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:53,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:53,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:53,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:53,922 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:35:53,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 23:35:53,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:53,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:53,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:35:54,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:54,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:35:54,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:54,185 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:35:54,205 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:35:54,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 236 treesize of output 235 [2021-11-20 23:35:54,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:35:54,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:54,692 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 25 treesize of output 25 [2021-11-20 23:35:54,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:54,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:54,776 INFO L354 Elim1Store]: treesize reduction 125, result has 25.1 percent of original size [2021-11-20 23:35:54,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 65 treesize of output 87 [2021-11-20 23:35:54,951 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-20 23:35:54,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:55,222 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:55,398 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:55,398 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:55,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 23 [2021-11-20 23:35:55,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494049393] [2021-11-20 23:35:55,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:55,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-20 23:35:55,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:55,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-20 23:35:55,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=425, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:35:55,401 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:55,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:55,551 INFO L93 Difference]: Finished difference Result 88 states and 107 transitions. [2021-11-20 23:35:55,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-20 23:35:55,551 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-20 23:35:55,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:55,553 INFO L225 Difference]: With dead ends: 88 [2021-11-20 23:35:55,553 INFO L226 Difference]: Without dead ends: 76 [2021-11-20 23:35:55,554 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=331, Invalid=425, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:35:55,554 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 79 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:55,555 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 42 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:35:55,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-20 23:35:55,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 36. [2021-11-20 23:35:55,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 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 23:35:55,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-11-20 23:35:55,562 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 18 [2021-11-20 23:35:55,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:55,562 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-11-20 23:35:55,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:55,563 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-11-20 23:35:55,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-20 23:35:55,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:55,564 INFO L514 BasicCegarLoop]: trace histogram [20, 8, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:55,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:55,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:55,785 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:55,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:55,786 INFO L85 PathProgramCache]: Analyzing trace with hash -936889138, now seen corresponding path program 4 times [2021-11-20 23:35:55,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:55,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751336975] [2021-11-20 23:35:55,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:55,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:55,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:55,926 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-11-20 23:35:55,927 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:55,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751336975] [2021-11-20 23:35:55,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751336975] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:55,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1864148753] [2021-11-20 23:35:55,927 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:35:55,928 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:55,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:55,941 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:55,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:35:56,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:56,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:35:56,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:56,240 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-20 23:35:56,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:56,709 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-20 23:35:56,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1864148753] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:56,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [980204505] [2021-11-20 23:35:56,712 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:35:56,712 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:56,712 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:56,712 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:56,712 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:56,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,782 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 23:35:56,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-20 23:35:56,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,846 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:35:56,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 23:35:56,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:35:57,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:57,021 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:35:57,044 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:35:57,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 236 treesize of output 235 [2021-11-20 23:35:57,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:35:57,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:57,509 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 23:35:57,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:57,612 INFO L354 Elim1Store]: treesize reduction 131, result has 21.6 percent of original size [2021-11-20 23:35:57,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 62 treesize of output 81 [2021-11-20 23:35:57,726 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-20 23:35:57,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:57,932 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:58,084 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:58,084 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:58,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 22, 22] total 51 [2021-11-20 23:35:58,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443187400] [2021-11-20 23:35:58,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:58,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-20 23:35:58,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:58,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-20 23:35:58,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1437, Invalid=1643, Unknown=0, NotChecked=0, Total=3080 [2021-11-20 23:35:58,089 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 51 states, 51 states have (on average 1.196078431372549) internal successors, (61), 51 states have internal predecessors, (61), 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 23:35:58,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:58,329 INFO L93 Difference]: Finished difference Result 142 states and 177 transitions. [2021-11-20 23:35:58,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-20 23:35:58,330 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.196078431372549) internal successors, (61), 51 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-20 23:35:58,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:58,331 INFO L225 Difference]: With dead ends: 142 [2021-11-20 23:35:58,332 INFO L226 Difference]: Without dead ends: 128 [2021-11-20 23:35:58,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1697 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1437, Invalid=1643, Unknown=0, NotChecked=0, Total=3080 [2021-11-20 23:35:58,334 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 199 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:58,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [199 Valid, 72 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:35:58,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-20 23:35:58,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 68. [2021-11-20 23:35:58,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.044776119402985) internal successors, (70), 67 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:58,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2021-11-20 23:35:58,346 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 34 [2021-11-20 23:35:58,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:58,346 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2021-11-20 23:35:58,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.196078431372549) internal successors, (61), 51 states have internal predecessors, (61), 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 23:35:58,347 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2021-11-20 23:35:58,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-20 23:35:58,349 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:58,349 INFO L514 BasicCegarLoop]: trace histogram [48, 12, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:58,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:58,576 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 23:35:58,576 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:58,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:58,577 INFO L85 PathProgramCache]: Analyzing trace with hash -1875309298, now seen corresponding path program 5 times [2021-11-20 23:35:58,577 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:58,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104349120] [2021-11-20 23:35:58,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:58,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:58,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:58,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2021-11-20 23:35:58,809 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:58,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104349120] [2021-11-20 23:35:58,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104349120] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:58,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2105934688] [2021-11-20 23:35:58,809 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:35:58,809 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:58,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:58,811 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:58,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:36:00,125 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-20 23:36:00,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:36:00,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-20 23:36:00,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:00,282 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2021-11-20 23:36:00,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:00,617 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2021-11-20 23:36:00,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2105934688] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:00,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1902746416] [2021-11-20 23:36:00,624 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:36:00,625 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:00,625 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:00,625 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:00,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:00,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:00,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:00,676 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:36:00,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 23:36:00,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:00,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:00,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:36:00,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:00,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:36:00,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:00,900 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:00,926 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:36:00,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 236 treesize of output 235 [2021-11-20 23:36:01,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:36:01,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,491 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 25 treesize of output 25 [2021-11-20 23:36:01,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,624 INFO L354 Elim1Store]: treesize reduction 125, result has 25.1 percent of original size [2021-11-20 23:36:01,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 65 treesize of output 87 [2021-11-20 23:36:01,700 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-20 23:36:01,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:01,934 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:02,098 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:02,098 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:02,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2021-11-20 23:36:02,099 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368804610] [2021-11-20 23:36:02,099 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:02,100 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-20 23:36:02,100 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:02,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-20 23:36:02,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=506, Invalid=616, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 23:36:02,101 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 29 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:02,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:02,332 INFO L93 Difference]: Finished difference Result 213 states and 229 transitions. [2021-11-20 23:36:02,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-20 23:36:02,333 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-20 23:36:02,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:02,335 INFO L225 Difference]: With dead ends: 213 [2021-11-20 23:36:02,336 INFO L226 Difference]: Without dead ends: 208 [2021-11-20 23:36:02,337 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=506, Invalid=616, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 23:36:02,337 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 304 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 304 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:02,338 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [304 Valid, 78 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:36:02,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-20 23:36:02,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 82. [2021-11-20 23:36:02,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.037037037037037) internal successors, (84), 81 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:02,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2021-11-20 23:36:02,350 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 66 [2021-11-20 23:36:02,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:02,351 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2021-11-20 23:36:02,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:02,351 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2021-11-20 23:36:02,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-20 23:36:02,354 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:02,354 INFO L514 BasicCegarLoop]: trace histogram [48, 26, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:02,394 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:02,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:02,580 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:02,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:02,581 INFO L85 PathProgramCache]: Analyzing trace with hash -1291366514, now seen corresponding path program 6 times [2021-11-20 23:36:02,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:02,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114981056] [2021-11-20 23:36:02,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:02,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:02,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:03,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1527 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2021-11-20 23:36:03,198 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:03,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114981056] [2021-11-20 23:36:03,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2114981056] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:03,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1209691963] [2021-11-20 23:36:03,199 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:36:03,199 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:03,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:03,200 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:03,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:36:03,329 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:36:03,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:36:03,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-20 23:36:03,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:03,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1527 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2021-11-20 23:36:03,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:06,412 INFO L134 CoverageAnalysis]: Checked inductivity of 1527 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2021-11-20 23:36:06,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1209691963] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:06,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [515424192] [2021-11-20 23:36:06,415 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:36:06,415 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:06,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:06,415 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:06,416 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:06,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,477 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 23:36:06,478 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-20 23:36:06,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,568 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:36:06,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 23:36:06,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:36:06,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,747 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:06,765 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:36:06,766 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 236 treesize of output 235 [2021-11-20 23:36:07,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:36:07,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:07,177 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 25 treesize of output 25 [2021-11-20 23:36:07,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:07,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:07,280 INFO L354 Elim1Store]: treesize reduction 125, result has 25.1 percent of original size [2021-11-20 23:36:07,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 65 treesize of output 87 [2021-11-20 23:36:07,390 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-20 23:36:07,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:07,571 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:07,729 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:07,730 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:07,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 50, 50] total 122 [2021-11-20 23:36:07,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902001844] [2021-11-20 23:36:07,730 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:07,731 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 122 states [2021-11-20 23:36:07,731 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:07,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2021-11-20 23:36:07,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7756, Invalid=8246, Unknown=0, NotChecked=0, Total=16002 [2021-11-20 23:36:07,741 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand has 122 states, 122 states have (on average 1.1065573770491803) internal successors, (135), 122 states have internal predecessors, (135), 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 23:36:08,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:08,759 INFO L93 Difference]: Finished difference Result 357 states and 438 transitions. [2021-11-20 23:36:08,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2021-11-20 23:36:08,760 INFO L78 Accepts]: Start accepts. Automaton has has 122 states, 122 states have (on average 1.1065573770491803) internal successors, (135), 122 states have internal predecessors, (135), 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 80 [2021-11-20 23:36:08,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:08,766 INFO L225 Difference]: With dead ends: 357 [2021-11-20 23:36:08,766 INFO L226 Difference]: Without dead ends: 325 [2021-11-20 23:36:08,773 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9039 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=7756, Invalid=8246, Unknown=0, NotChecked=0, Total=16002 [2021-11-20 23:36:08,775 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 683 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 514 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 683 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 514 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:08,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [683 Valid, 174 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [514 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:36:08,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2021-11-20 23:36:08,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 160. [2021-11-20 23:36:08,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 159 states have (on average 1.0188679245283019) internal successors, (162), 159 states have internal predecessors, (162), 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 23:36:08,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 162 transitions. [2021-11-20 23:36:08,819 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 162 transitions. Word has length 80 [2021-11-20 23:36:08,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:08,820 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 162 transitions. [2021-11-20 23:36:08,820 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 122 states, 122 states have (on average 1.1065573770491803) internal successors, (135), 122 states have internal predecessors, (135), 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 23:36:08,820 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 162 transitions. [2021-11-20 23:36:08,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-20 23:36:08,824 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:08,824 INFO L514 BasicCegarLoop]: trace histogram [119, 33, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:08,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:09,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:09,052 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:09,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:09,053 INFO L85 PathProgramCache]: Analyzing trace with hash -1019003145, now seen corresponding path program 7 times [2021-11-20 23:36:09,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:09,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683547858] [2021-11-20 23:36:09,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:09,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:09,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:09,850 INFO L134 CoverageAnalysis]: Checked inductivity of 7701 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 7140 trivial. 0 not checked. [2021-11-20 23:36:09,850 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:09,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683547858] [2021-11-20 23:36:09,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683547858] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:09,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [926881627] [2021-11-20 23:36:09,850 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:36:09,850 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:09,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:09,851 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:09,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:36:09,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:10,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 971 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-20 23:36:10,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:11,439 INFO L134 CoverageAnalysis]: Checked inductivity of 7701 backedges. 0 proven. 7140 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2021-11-20 23:36:11,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:19,514 INFO L134 CoverageAnalysis]: Checked inductivity of 7701 backedges. 0 proven. 7140 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2021-11-20 23:36:19,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [926881627] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:19,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1176099593] [2021-11-20 23:36:19,517 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:36:19,517 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:19,517 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:19,518 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:19,518 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:19,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:19,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:19,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:19,574 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:36:19,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 23:36:19,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:19,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:19,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:36:19,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:19,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:36:19,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:19,801 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:19,828 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:36:19,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 236 treesize of output 235 [2021-11-20 23:36:20,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:36:20,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:20,513 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 23:36:20,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:20,628 INFO L354 Elim1Store]: treesize reduction 131, result has 21.6 percent of original size [2021-11-20 23:36:20,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 62 treesize of output 81 [2021-11-20 23:36:20,762 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-20 23:36:20,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:21,000 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:21,207 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:21,208 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:21,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 121, 121] total 263 [2021-11-20 23:36:21,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216170793] [2021-11-20 23:36:21,208 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:21,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 263 states [2021-11-20 23:36:21,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:21,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 263 interpolants. [2021-11-20 23:36:21,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35251, Invalid=36305, Unknown=0, NotChecked=0, Total=71556 [2021-11-20 23:36:21,231 INFO L87 Difference]: Start difference. First operand 160 states and 162 transitions. Second operand has 263 states, 263 states have (on average 1.079847908745247) internal successors, (284), 263 states have internal predecessors, (284), 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 23:36:27,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:27,436 INFO L93 Difference]: Finished difference Result 595 states and 754 transitions. [2021-11-20 23:36:27,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 263 states. [2021-11-20 23:36:27,437 INFO L78 Accepts]: Start accepts. Automaton has has 263 states, 263 states have (on average 1.079847908745247) internal successors, (284), 263 states have internal predecessors, (284), 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 158 [2021-11-20 23:36:27,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:27,441 INFO L225 Difference]: With dead ends: 595 [2021-11-20 23:36:27,442 INFO L226 Difference]: Without dead ends: 556 [2021-11-20 23:36:27,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 266 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44361 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=35251, Invalid=36305, Unknown=0, NotChecked=0, Total=71556 [2021-11-20 23:36:27,451 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 983 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 576 mSolverCounterSat, 1219 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 983 SdHoareTripleChecker+Valid, 312 SdHoareTripleChecker+Invalid, 1795 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1219 IncrementalHoareTripleChecker+Valid, 576 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:27,451 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [983 Valid, 312 Invalid, 1795 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1219 Valid, 576 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-20 23:36:27,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-11-20 23:36:27,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 316. [2021-11-20 23:36:27,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 315 states have (on average 1.0095238095238095) internal successors, (318), 315 states have internal predecessors, (318), 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 23:36:27,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 318 transitions. [2021-11-20 23:36:27,484 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 318 transitions. Word has length 158 [2021-11-20 23:36:27,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:27,485 INFO L470 AbstractCegarLoop]: Abstraction has 316 states and 318 transitions. [2021-11-20 23:36:27,486 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 263 states, 263 states have (on average 1.079847908745247) internal successors, (284), 263 states have internal predecessors, (284), 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 23:36:27,487 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 318 transitions. [2021-11-20 23:36:27,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2021-11-20 23:36:27,495 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:27,495 INFO L514 BasicCegarLoop]: trace histogram [260, 48, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:27,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:27,720 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-20 23:36:27,720 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:27,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:27,721 INFO L85 PathProgramCache]: Analyzing trace with hash 1473634254, now seen corresponding path program 8 times [2021-11-20 23:36:27,721 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:27,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2068058696] [2021-11-20 23:36:27,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:27,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:27,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:29,607 INFO L134 CoverageAnalysis]: Checked inductivity of 35106 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 33930 trivial. 0 not checked. [2021-11-20 23:36:29,608 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:29,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2068058696] [2021-11-20 23:36:29,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2068058696] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:29,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [71782940] [2021-11-20 23:36:29,609 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:36:29,610 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:29,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:29,613 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:29,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed878e31-4e33-433e-8f98-1bb486296797/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process