./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur --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 49403db555b72e8190819e443264a1fc2796f8e39e39a8e1b1a8f1697d9e5642 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-38b53e6 [2022-11-26 00:06:39,556 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-26 00:06:39,558 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-26 00:06:39,576 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-26 00:06:39,577 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-26 00:06:39,578 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-26 00:06:39,579 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-26 00:06:39,581 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-26 00:06:39,583 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-26 00:06:39,584 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-26 00:06:39,585 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-26 00:06:39,586 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-26 00:06:39,586 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-26 00:06:39,588 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-26 00:06:39,589 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-26 00:06:39,590 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-26 00:06:39,591 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-26 00:06:39,592 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-26 00:06:39,593 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-26 00:06:39,595 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-26 00:06:39,596 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-26 00:06:39,598 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-26 00:06:39,599 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-26 00:06:39,600 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-26 00:06:39,603 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-26 00:06:39,603 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-26 00:06:39,604 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-26 00:06:39,605 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-26 00:06:39,605 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-26 00:06:39,606 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-26 00:06:39,607 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-26 00:06:39,607 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-26 00:06:39,608 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-26 00:06:39,609 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-26 00:06:39,610 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-26 00:06:39,611 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-26 00:06:39,611 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-26 00:06:39,612 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-26 00:06:39,612 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-26 00:06:39,613 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-26 00:06:39,615 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-26 00:06:39,616 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-26 00:06:39,648 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-26 00:06:39,648 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-26 00:06:39,649 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-26 00:06:39,649 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-26 00:06:39,655 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-26 00:06:39,656 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-26 00:06:39,656 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-26 00:06:39,656 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-26 00:06:39,656 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-26 00:06:39,657 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-26 00:06:39,658 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-26 00:06:39,658 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-26 00:06:39,658 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-26 00:06:39,658 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-26 00:06:39,659 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-26 00:06:39,659 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-26 00:06:39,659 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-26 00:06:39,659 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-26 00:06:39,660 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-26 00:06:39,660 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-26 00:06:39,661 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-26 00:06:39,661 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-26 00:06:39,661 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-26 00:06:39,662 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-26 00:06:39,662 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-26 00:06:39,662 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-26 00:06:39,663 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-26 00:06:39,663 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-26 00:06:39,663 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-26 00:06:39,664 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-26 00:06:39,664 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-26 00:06:39,664 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-26 00:06:39,664 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 00:06:39,665 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-26 00:06:39,665 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-26 00:06:39,665 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-26 00:06:39,665 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-26 00:06:39,666 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-26 00:06:39,666 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-26 00:06:39,667 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-26 00:06:39,667 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-26 00:06:39,667 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 49403db555b72e8190819e443264a1fc2796f8e39e39a8e1b1a8f1697d9e5642 [2022-11-26 00:06:39,974 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-26 00:06:39,996 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-26 00:06:39,998 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-26 00:06:40,000 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-26 00:06:40,000 INFO L275 PluginConnector]: CDTParser initialized [2022-11-26 00:06:40,002 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i [2022-11-26 00:06:42,914 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-26 00:06:43,143 INFO L351 CDTParser]: Found 1 translation units. [2022-11-26 00:06:43,144 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i [2022-11-26 00:06:43,151 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/data/900fd08d7/e0cac97765514b02b602ab09edc1c780/FLAG258968720 [2022-11-26 00:06:43,164 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/data/900fd08d7/e0cac97765514b02b602ab09edc1c780 [2022-11-26 00:06:43,167 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-26 00:06:43,168 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-26 00:06:43,170 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-26 00:06:43,170 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-26 00:06:43,173 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-26 00:06:43,174 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 12:06:43" (1/1) ... [2022-11-26 00:06:43,175 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@15496930 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:06:43, skipping insertion in model container [2022-11-26 00:06:43,175 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 12:06:43" (1/1) ... [2022-11-26 00:06:43,183 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-26 00:06:43,199 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-26 00:06:43,347 WARN L237 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_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i[823,836] [2022-11-26 00:06:43,366 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 00:06:43,374 INFO L203 MainTranslator]: Completed pre-run [2022-11-26 00:06:43,385 WARN L237 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_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i[823,836] [2022-11-26 00:06:43,395 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 00:06:43,408 INFO L208 MainTranslator]: Completed translation [2022-11-26 00:06:43,409 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:06:43 WrapperNode [2022-11-26 00:06:43,409 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-26 00:06:43,410 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-26 00:06:43,410 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-26 00:06:43,410 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-26 00:06:43,415 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:06:43" (1/1) ... [2022-11-26 00:06:43,422 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:06:43" (1/1) ... [2022-11-26 00:06:43,439 INFO L138 Inliner]: procedures = 16, calls = 25, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 114 [2022-11-26 00:06:43,440 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-26 00:06:43,440 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-26 00:06:43,441 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-26 00:06:43,441 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-26 00:06:43,449 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:06:43" (1/1) ... [2022-11-26 00:06:43,449 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:06:43" (1/1) ... [2022-11-26 00:06:43,452 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:06:43" (1/1) ... [2022-11-26 00:06:43,452 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:06:43" (1/1) ... [2022-11-26 00:06:43,458 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:06:43" (1/1) ... [2022-11-26 00:06:43,463 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:06:43" (1/1) ... [2022-11-26 00:06:43,464 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:06:43" (1/1) ... [2022-11-26 00:06:43,465 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:06:43" (1/1) ... [2022-11-26 00:06:43,467 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-26 00:06:43,468 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-26 00:06:43,468 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-26 00:06:43,468 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-26 00:06:43,469 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:06:43" (1/1) ... [2022-11-26 00:06:43,475 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 00:06:43,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:06:43,504 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-26 00:06:43,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-26 00:06:43,545 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-26 00:06:43,545 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-26 00:06:43,545 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-26 00:06:43,545 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-26 00:06:43,546 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-26 00:06:43,546 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-26 00:06:43,546 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-26 00:06:43,546 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-26 00:06:43,546 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-26 00:06:43,546 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-26 00:06:43,648 INFO L235 CfgBuilder]: Building ICFG [2022-11-26 00:06:43,650 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-26 00:06:43,885 INFO L276 CfgBuilder]: Performing block encoding [2022-11-26 00:06:44,005 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-26 00:06:44,006 INFO L300 CfgBuilder]: Removed 8 assume(true) statements. [2022-11-26 00:06:44,008 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 12:06:44 BoogieIcfgContainer [2022-11-26 00:06:44,009 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-26 00:06:44,012 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-26 00:06:44,012 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-26 00:06:44,015 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-26 00:06:44,016 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 12:06:43" (1/3) ... [2022-11-26 00:06:44,016 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24b0df39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 12:06:44, skipping insertion in model container [2022-11-26 00:06:44,017 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:06:43" (2/3) ... [2022-11-26 00:06:44,017 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24b0df39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 12:06:44, skipping insertion in model container [2022-11-26 00:06:44,017 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 12:06:44" (3/3) ... [2022-11-26 00:06:44,019 INFO L112 eAbstractionObserver]: Analyzing ICFG sorting_selectionsort_ground-2.i [2022-11-26 00:06:44,038 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-26 00:06:44,039 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-26 00:06:44,089 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-26 00:06:44,096 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@231a3e56, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-26 00:06:44,096 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-26 00:06:44,101 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-26 00:06:44,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-26 00:06:44,108 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:06:44,109 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:06:44,109 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:06:44,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:06:44,115 INFO L85 PathProgramCache]: Analyzing trace with hash 1511467156, now seen corresponding path program 1 times [2022-11-26 00:06:44,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:06:44,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966241599] [2022-11-26 00:06:44,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:44,127 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:06:44,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:44,316 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:06:44,316 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:06:44,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1966241599] [2022-11-26 00:06:44,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1966241599] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:06:44,318 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:06:44,318 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-26 00:06:44,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16457920] [2022-11-26 00:06:44,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:06:44,325 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-26 00:06:44,326 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:06:44,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-26 00:06:44,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-26 00:06:44,364 INFO L87 Difference]: Start difference. First operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:06:44,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:06:44,483 INFO L93 Difference]: Finished difference Result 43 states and 66 transitions. [2022-11-26 00:06:44,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-26 00:06:44,490 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-26 00:06:44,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:06:44,498 INFO L225 Difference]: With dead ends: 43 [2022-11-26 00:06:44,499 INFO L226 Difference]: Without dead ends: 22 [2022-11-26 00:06:44,503 INFO L412 NwaCegarLoop]: 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 [2022-11-26 00:06:44,507 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:06:44,510 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:06:44,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-26 00:06:44,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-26 00:06:44,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 17 states have internal predecessors, (25), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-26 00:06:44,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 31 transitions. [2022-11-26 00:06:44,556 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 31 transitions. Word has length 9 [2022-11-26 00:06:44,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:06:44,557 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 31 transitions. [2022-11-26 00:06:44,557 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:06:44,557 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 31 transitions. [2022-11-26 00:06:44,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-26 00:06:44,560 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:06:44,560 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:06:44,560 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-26 00:06:44,561 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:06:44,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:06:44,562 INFO L85 PathProgramCache]: Analyzing trace with hash 1913202077, now seen corresponding path program 1 times [2022-11-26 00:06:44,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:06:44,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2002503340] [2022-11-26 00:06:44,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:44,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:06:44,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:44,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:06:44,700 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:06:44,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2002503340] [2022-11-26 00:06:44,700 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2002503340] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:06:44,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [777621771] [2022-11-26 00:06:44,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:44,701 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:44,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:06:44,705 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:06:44,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-26 00:06:44,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:44,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-26 00:06:44,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:06:44,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-26 00:06:44,821 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 00:06:44,821 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [777621771] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:06:44,822 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:06:44,822 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2022-11-26 00:06:44,823 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315209685] [2022-11-26 00:06:44,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:06:44,824 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-26 00:06:44,824 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:06:44,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-26 00:06:44,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-26 00:06:44,828 INFO L87 Difference]: Start difference. First operand 22 states and 31 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:06:44,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:06:44,896 INFO L93 Difference]: Finished difference Result 41 states and 58 transitions. [2022-11-26 00:06:44,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-26 00:06:44,897 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-26 00:06:44,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:06:44,898 INFO L225 Difference]: With dead ends: 41 [2022-11-26 00:06:44,898 INFO L226 Difference]: Without dead ends: 31 [2022-11-26 00:06:44,899 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-26 00:06:44,900 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 11 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:06:44,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 28 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:06:44,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-26 00:06:44,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 23. [2022-11-26 00:06:44,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 18 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-26 00:06:44,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 32 transitions. [2022-11-26 00:06:44,913 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 32 transitions. Word has length 10 [2022-11-26 00:06:44,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:06:44,913 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 32 transitions. [2022-11-26 00:06:44,914 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:06:44,914 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 32 transitions. [2022-11-26 00:06:44,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-26 00:06:44,915 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:06:44,915 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:06:44,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-26 00:06:45,120 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:45,121 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:06:45,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:06:45,122 INFO L85 PathProgramCache]: Analyzing trace with hash -811537542, now seen corresponding path program 1 times [2022-11-26 00:06:45,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:06:45,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1493021784] [2022-11-26 00:06:45,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:45,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:06:45,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:45,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:06:45,284 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:06:45,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1493021784] [2022-11-26 00:06:45,284 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1493021784] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:06:45,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1125731257] [2022-11-26 00:06:45,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:45,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:45,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:06:45,286 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:06:45,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-26 00:06:45,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:45,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-26 00:06:45,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:06:45,379 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:06:45,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:06:45,400 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:06:45,401 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1125731257] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:06:45,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1178969200] [2022-11-26 00:06:45,421 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-26 00:06:45,422 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:06:45,425 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:06:45,431 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:06:45,432 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:06:45,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:45,520 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-26 00:06:45,521 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-26 00:06:45,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:45,556 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:06:45,556 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:06:45,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:45,596 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:06:45,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:45,696 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:06:45,723 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:06:45,724 INFO L350 Elim1Store]: Elim1 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 192 treesize of output 191 [2022-11-26 00:06:45,860 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:06:45,879 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:06:45,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1178969200] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:06:45,969 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:06:45,969 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 9 [2022-11-26 00:06:45,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578382280] [2022-11-26 00:06:45,970 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:06:45,971 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-26 00:06:45,971 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:06:45,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-26 00:06:45,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-26 00:06:45,974 INFO L87 Difference]: Start difference. First operand 23 states and 32 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:06:46,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:06:46,087 INFO L93 Difference]: Finished difference Result 51 states and 75 transitions. [2022-11-26 00:06:46,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-26 00:06:46,087 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-26 00:06:46,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:06:46,088 INFO L225 Difference]: With dead ends: 51 [2022-11-26 00:06:46,088 INFO L226 Difference]: Without dead ends: 32 [2022-11-26 00:06:46,089 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-26 00:06:46,090 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 10 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:06:46,090 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 35 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:06:46,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-26 00:06:46,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2022-11-26 00:06:46,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-26 00:06:46,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2022-11-26 00:06:46,097 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 11 [2022-11-26 00:06:46,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:06:46,098 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2022-11-26 00:06:46,098 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:06:46,098 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2022-11-26 00:06:46,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-26 00:06:46,099 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:06:46,099 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:06:46,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-26 00:06:46,304 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:46,304 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:06:46,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:06:46,305 INFO L85 PathProgramCache]: Analyzing trace with hash -531083360, now seen corresponding path program 1 times [2022-11-26 00:06:46,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:06:46,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530618253] [2022-11-26 00:06:46,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:46,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:06:46,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:46,376 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-26 00:06:46,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:06:46,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530618253] [2022-11-26 00:06:46,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530618253] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:06:46,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [88092684] [2022-11-26 00:06:46,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:46,378 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:46,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:06:46,379 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:06:46,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-26 00:06:46,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:46,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-26 00:06:46,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:06:46,452 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-26 00:06:46,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:06:46,468 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-26 00:06:46,468 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [88092684] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:06:46,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1469936142] [2022-11-26 00:06:46,471 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-26 00:06:46,471 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:06:46,471 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:06:46,472 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:06:46,472 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:06:46,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:46,503 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-26 00:06:46,503 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-26 00:06:46,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:46,535 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:06:46,536 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:06:46,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:46,567 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-26 00:06:46,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:46,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:46,665 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-26 00:06:46,666 INFO L350 Elim1Store]: Elim1 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 202 treesize of output 190 [2022-11-26 00:06:46,720 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:06:46,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:46,793 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-26 00:06:46,826 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-26 00:06:46,831 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:06:47,081 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1469936142] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:06:47,082 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:06:47,082 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [3, 3, 3] total 13 [2022-11-26 00:06:47,082 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853117692] [2022-11-26 00:06:47,082 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:06:47,083 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-26 00:06:47,083 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:06:47,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-26 00:06:47,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2022-11-26 00:06:47,084 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:06:47,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:06:47,204 INFO L93 Difference]: Finished difference Result 55 states and 78 transitions. [2022-11-26 00:06:47,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-26 00:06:47,205 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-26 00:06:47,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:06:47,206 INFO L225 Difference]: With dead ends: 55 [2022-11-26 00:06:47,206 INFO L226 Difference]: Without dead ends: 36 [2022-11-26 00:06:47,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2022-11-26 00:06:47,208 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 13 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:06:47,208 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 34 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:06:47,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-26 00:06:47,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 32. [2022-11-26 00:06:47,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 25 states have (on average 1.36) internal successors, (34), 26 states have internal predecessors, (34), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-26 00:06:47,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2022-11-26 00:06:47,230 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 12 [2022-11-26 00:06:47,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:06:47,230 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2022-11-26 00:06:47,231 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:06:47,231 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2022-11-26 00:06:47,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-26 00:06:47,232 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:06:47,233 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:06:47,242 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-26 00:06:47,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:47,438 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:06:47,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:06:47,439 INFO L85 PathProgramCache]: Analyzing trace with hash -563817593, now seen corresponding path program 1 times [2022-11-26 00:06:47,439 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:06:47,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639096065] [2022-11-26 00:06:47,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:47,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:06:47,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:47,510 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-26 00:06:47,510 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:06:47,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639096065] [2022-11-26 00:06:47,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [639096065] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:06:47,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964934343] [2022-11-26 00:06:47,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:47,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:47,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:06:47,513 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:06:47,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-26 00:06:47,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:47,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-26 00:06:47,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:06:47,597 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-26 00:06:47,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:06:47,617 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-26 00:06:47,617 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [964934343] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:06:47,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [503523750] [2022-11-26 00:06:47,620 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-26 00:06:47,620 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:06:47,621 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:06:47,621 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:06:47,621 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:06:47,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:47,654 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:06:47,654 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:06:47,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:47,666 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-26 00:06:47,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:47,693 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-26 00:06:47,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:47,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:47,767 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-26 00:06:47,768 INFO L350 Elim1Store]: Elim1 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 202 treesize of output 190 [2022-11-26 00:06:47,824 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:06:47,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:47,892 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-26 00:06:48,035 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-26 00:06:48,052 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:06:48,328 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '791#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:06:48,328 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:06:48,328 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:06:48,328 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 4] total 7 [2022-11-26 00:06:48,328 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28760895] [2022-11-26 00:06:48,329 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:06:48,329 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-26 00:06:48,329 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:06:48,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-26 00:06:48,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2022-11-26 00:06:48,331 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:06:48,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:06:48,383 INFO L93 Difference]: Finished difference Result 64 states and 86 transitions. [2022-11-26 00:06:48,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-26 00:06:48,383 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2022-11-26 00:06:48,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:06:48,385 INFO L225 Difference]: With dead ends: 64 [2022-11-26 00:06:48,386 INFO L226 Difference]: Without dead ends: 35 [2022-11-26 00:06:48,386 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2022-11-26 00:06:48,388 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:06:48,390 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 68 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-26 00:06:48,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-26 00:06:48,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-11-26 00:06:48,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 29 states have internal predecessors, (37), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-26 00:06:48,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2022-11-26 00:06:48,411 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 19 [2022-11-26 00:06:48,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:06:48,413 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2022-11-26 00:06:48,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:06:48,418 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2022-11-26 00:06:48,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-26 00:06:48,420 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:06:48,420 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:06:48,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-26 00:06:48,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:48,621 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:06:48,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:06:48,621 INFO L85 PathProgramCache]: Analyzing trace with hash 1633633328, now seen corresponding path program 2 times [2022-11-26 00:06:48,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:06:48,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [873301662] [2022-11-26 00:06:48,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:48,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:06:48,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:48,763 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-26 00:06:48,764 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:06:48,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [873301662] [2022-11-26 00:06:48,764 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [873301662] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:06:48,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279146857] [2022-11-26 00:06:48,764 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:06:48,765 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:48,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:06:48,766 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:06:48,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-26 00:06:48,847 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-26 00:06:48,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:06:48,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-26 00:06:48,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:06:48,877 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-26 00:06:48,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:06:48,915 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 00:06:48,915 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [279146857] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:06:48,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1105045983] [2022-11-26 00:06:48,924 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-26 00:06:48,925 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:06:48,925 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:06:48,925 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:06:48,925 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:06:48,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:48,960 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:06:48,960 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:06:48,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:48,973 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-26 00:06:48,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:48,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-26 00:06:49,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:49,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:49,078 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-26 00:06:49,078 INFO L350 Elim1Store]: Elim1 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 202 treesize of output 190 [2022-11-26 00:06:49,124 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:06:49,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:49,178 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-26 00:06:49,315 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-26 00:06:49,330 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:06:49,654 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1103#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:06:49,654 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:06:49,654 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:06:49,655 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2022-11-26 00:06:49,655 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034894071] [2022-11-26 00:06:49,655 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:06:49,655 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-26 00:06:49,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:06:49,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-26 00:06:49,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2022-11-26 00:06:49,656 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:06:49,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:06:49,911 INFO L93 Difference]: Finished difference Result 82 states and 116 transitions. [2022-11-26 00:06:49,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-26 00:06:49,912 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 22 [2022-11-26 00:06:49,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:06:49,912 INFO L225 Difference]: With dead ends: 82 [2022-11-26 00:06:49,912 INFO L226 Difference]: Without dead ends: 53 [2022-11-26 00:06:49,913 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=185, Invalid=937, Unknown=0, NotChecked=0, Total=1122 [2022-11-26 00:06:49,914 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 28 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:06:49,914 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 122 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:06:49,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-26 00:06:49,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 45. [2022-11-26 00:06:49,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 37 states have (on average 1.2702702702702702) internal successors, (47), 38 states have internal predecessors, (47), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:06:49,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 57 transitions. [2022-11-26 00:06:49,924 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 57 transitions. Word has length 22 [2022-11-26 00:06:49,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:06:49,925 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 57 transitions. [2022-11-26 00:06:49,925 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:06:49,925 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 57 transitions. [2022-11-26 00:06:49,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-26 00:06:49,926 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:06:49,926 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:06:49,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-26 00:06:50,131 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-26 00:06:50,132 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:06:50,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:06:50,132 INFO L85 PathProgramCache]: Analyzing trace with hash -269831507, now seen corresponding path program 3 times [2022-11-26 00:06:50,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:06:50,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961681243] [2022-11-26 00:06:50,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:50,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:06:50,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:50,276 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 00:06:50,276 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:06:50,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961681243] [2022-11-26 00:06:50,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [961681243] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:06:50,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1961506784] [2022-11-26 00:06:50,277 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:06:50,277 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:50,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:06:50,278 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:06:50,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-26 00:06:50,362 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:06:50,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:06:50,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-26 00:06:50,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:06:50,391 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-26 00:06:50,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:06:50,469 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 00:06:50,469 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1961506784] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:06:50,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1998955315] [2022-11-26 00:06:50,472 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-26 00:06:50,472 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:06:50,472 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:06:50,473 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:06:50,473 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:06:50,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:50,500 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-26 00:06:50,501 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-26 00:06:50,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:50,526 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:06:50,526 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:06:50,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:50,551 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:06:50,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:50,600 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:06:50,623 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:06:50,624 INFO L350 Elim1Store]: Elim1 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 192 treesize of output 191 [2022-11-26 00:06:50,712 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:06:50,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:50,754 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-26 00:06:50,903 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-26 00:06:50,918 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:06:51,195 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1515#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:06:51,195 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:06:51,196 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:06:51,196 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 8] total 15 [2022-11-26 00:06:51,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132973294] [2022-11-26 00:06:51,196 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:06:51,196 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-26 00:06:51,196 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:06:51,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-26 00:06:51,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=456, Unknown=0, NotChecked=0, Total=600 [2022-11-26 00:06:51,197 INFO L87 Difference]: Start difference. First operand 45 states and 57 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:06:51,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:06:51,260 INFO L93 Difference]: Finished difference Result 90 states and 120 transitions. [2022-11-26 00:06:51,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-26 00:06:51,261 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 26 [2022-11-26 00:06:51,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:06:51,261 INFO L225 Difference]: With dead ends: 90 [2022-11-26 00:06:51,261 INFO L226 Difference]: Without dead ends: 52 [2022-11-26 00:06:51,263 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=144, Invalid=456, Unknown=0, NotChecked=0, Total=600 [2022-11-26 00:06:51,264 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:06:51,264 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 51 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-26 00:06:51,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-26 00:06:51,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-11-26 00:06:51,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 45 states have internal predecessors, (54), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:06:51,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 64 transitions. [2022-11-26 00:06:51,283 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 64 transitions. Word has length 26 [2022-11-26 00:06:51,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:06:51,283 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 64 transitions. [2022-11-26 00:06:51,283 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:06:51,284 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 64 transitions. [2022-11-26 00:06:51,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-26 00:06:51,285 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:06:51,285 INFO L195 NwaCegarLoop]: trace histogram [12, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:06:51,295 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-26 00:06:51,490 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:51,491 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:06:51,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:06:51,491 INFO L85 PathProgramCache]: Analyzing trace with hash -237978588, now seen corresponding path program 4 times [2022-11-26 00:06:51,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:06:51,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231062931] [2022-11-26 00:06:51,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:51,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:06:51,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:51,784 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 00:06:51,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:06:51,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231062931] [2022-11-26 00:06:51,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [231062931] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:06:51,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920725026] [2022-11-26 00:06:51,785 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:06:51,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:51,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:06:51,786 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:06:51,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-26 00:06:51,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:51,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-26 00:06:51,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:06:51,964 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-26 00:06:51,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:06:52,316 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 00:06:52,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1920725026] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:06:52,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [878346846] [2022-11-26 00:06:52,318 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-26 00:06:52,318 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:06:52,319 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:06:52,319 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:06:52,319 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:06:52,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:52,366 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-26 00:06:52,370 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-26 00:06:52,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:52,403 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:06:52,404 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:06:52,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:52,424 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:06:52,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:52,478 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:06:52,503 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:06:52,504 INFO L350 Elim1Store]: Elim1 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 192 treesize of output 191 [2022-11-26 00:06:52,587 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:06:52,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:52,628 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-26 00:06:52,758 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-26 00:06:52,772 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:06:53,079 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1992#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:06:53,079 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:06:53,079 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:06:53,079 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 15] total 29 [2022-11-26 00:06:53,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406776640] [2022-11-26 00:06:53,080 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:06:53,080 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-26 00:06:53,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:06:53,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-26 00:06:53,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=1037, Unknown=0, NotChecked=0, Total=1482 [2022-11-26 00:06:53,082 INFO L87 Difference]: Start difference. First operand 52 states and 64 transitions. Second operand has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:06:53,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:06:53,163 INFO L93 Difference]: Finished difference Result 104 states and 141 transitions. [2022-11-26 00:06:53,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-26 00:06:53,163 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2022-11-26 00:06:53,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:06:53,164 INFO L225 Difference]: With dead ends: 104 [2022-11-26 00:06:53,164 INFO L226 Difference]: Without dead ends: 66 [2022-11-26 00:06:53,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=445, Invalid=1037, Unknown=0, NotChecked=0, Total=1482 [2022-11-26 00:06:53,166 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:06:53,167 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 102 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:06:53,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-26 00:06:53,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2022-11-26 00:06:53,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 58 states have (on average 1.1724137931034482) internal successors, (68), 59 states have internal predecessors, (68), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:06:53,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 78 transitions. [2022-11-26 00:06:53,178 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 78 transitions. Word has length 33 [2022-11-26 00:06:53,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:06:53,178 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 78 transitions. [2022-11-26 00:06:53,178 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:06:53,179 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 78 transitions. [2022-11-26 00:06:53,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-26 00:06:53,180 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:06:53,180 INFO L195 NwaCegarLoop]: trace histogram [26, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:06:53,190 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-26 00:06:53,385 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:53,385 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:06:53,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:06:53,386 INFO L85 PathProgramCache]: Analyzing trace with hash -2004149244, now seen corresponding path program 5 times [2022-11-26 00:06:53,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:06:53,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163297360] [2022-11-26 00:06:53,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:53,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:06:53,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:54,275 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 2 proven. 351 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 00:06:54,276 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:06:54,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163297360] [2022-11-26 00:06:54,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163297360] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:06:54,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [962555550] [2022-11-26 00:06:54,276 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:06:54,276 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:54,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:06:54,279 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:06:54,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-26 00:06:54,383 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-26 00:06:54,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:06:54,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-26 00:06:54,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:06:54,535 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2022-11-26 00:06:54,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:06:54,687 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2022-11-26 00:06:54,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [962555550] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:06:54,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1145432683] [2022-11-26 00:06:54,689 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-26 00:06:54,689 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:06:54,689 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:06:54,689 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:06:54,689 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:06:54,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:54,713 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-26 00:06:54,714 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-26 00:06:54,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:54,740 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:06:54,740 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:06:54,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:54,760 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:06:54,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:54,805 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:06:54,828 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:06:54,829 INFO L350 Elim1Store]: Elim1 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 192 treesize of output 191 [2022-11-26 00:06:54,901 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:06:54,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:54,940 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-26 00:06:55,053 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-26 00:06:55,068 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:06:55,553 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2621#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:06:55,554 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:06:55,554 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:06:55,554 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 8, 8] total 41 [2022-11-26 00:06:55,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29520890] [2022-11-26 00:06:55,554 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:06:55,555 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-26 00:06:55,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:06:55,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-26 00:06:55,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=527, Invalid=2023, Unknown=0, NotChecked=0, Total=2550 [2022-11-26 00:06:55,557 INFO L87 Difference]: Start difference. First operand 66 states and 78 transitions. Second operand has 41 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 41 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:06:56,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:06:56,763 INFO L93 Difference]: Finished difference Result 122 states and 161 transitions. [2022-11-26 00:06:56,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-26 00:06:56,764 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 41 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 47 [2022-11-26 00:06:56,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:06:56,765 INFO L225 Difference]: With dead ends: 122 [2022-11-26 00:06:56,765 INFO L226 Difference]: Without dead ends: 84 [2022-11-26 00:06:56,768 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2036 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1584, Invalid=6972, Unknown=0, NotChecked=0, Total=8556 [2022-11-26 00:06:56,769 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 103 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:06:56,770 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 173 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:06:56,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-26 00:06:56,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 76. [2022-11-26 00:06:56,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 68 states have (on average 1.1470588235294117) internal successors, (78), 69 states have internal predecessors, (78), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:06:56,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 88 transitions. [2022-11-26 00:06:56,783 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 88 transitions. Word has length 47 [2022-11-26 00:06:56,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:06:56,783 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 88 transitions. [2022-11-26 00:06:56,783 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 41 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:06:56,784 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 88 transitions. [2022-11-26 00:06:56,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-26 00:06:56,785 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:06:56,785 INFO L195 NwaCegarLoop]: trace histogram [27, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:06:56,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-26 00:06:56,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:56,991 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:06:56,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:06:56,991 INFO L85 PathProgramCache]: Analyzing trace with hash -787080179, now seen corresponding path program 6 times [2022-11-26 00:06:56,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:06:56,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079005741] [2022-11-26 00:06:56,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:06:56,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:06:57,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:06:57,979 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 2 proven. 378 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2022-11-26 00:06:57,979 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:06:57,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079005741] [2022-11-26 00:06:57,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079005741] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:06:57,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1967736164] [2022-11-26 00:06:57,979 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:06:57,980 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:06:57,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:06:57,981 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:06:57,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-26 00:06:58,121 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:06:58,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:06:58,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-26 00:06:58,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:06:58,191 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-26 00:06:58,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:06:59,313 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 2 proven. 378 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2022-11-26 00:06:59,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1967736164] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:06:59,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [580566376] [2022-11-26 00:06:59,315 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-26 00:06:59,315 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:06:59,316 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:06:59,316 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:06:59,316 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:06:59,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:59,350 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:06:59,350 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:06:59,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:59,360 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-26 00:06:59,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:59,377 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:06:59,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:59,423 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:06:59,446 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:06:59,446 INFO L350 Elim1Store]: Elim1 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 192 treesize of output 191 [2022-11-26 00:06:59,519 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:06:59,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:06:59,563 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-26 00:06:59,674 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-26 00:06:59,686 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:07:00,087 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3448#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:07:00,087 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:07:00,087 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:07:00,087 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 30] total 59 [2022-11-26 00:07:00,087 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310078488] [2022-11-26 00:07:00,087 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:07:00,088 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-26 00:07:00,088 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:07:00,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-26 00:07:00,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1750, Invalid=2942, Unknown=0, NotChecked=0, Total=4692 [2022-11-26 00:07:00,091 INFO L87 Difference]: Start difference. First operand 76 states and 88 transitions. Second operand has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 59 states have internal predecessors, (74), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:07:00,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:07:00,224 INFO L93 Difference]: Finished difference Result 152 states and 204 transitions. [2022-11-26 00:07:00,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-11-26 00:07:00,224 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 59 states have internal predecessors, (74), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 54 [2022-11-26 00:07:00,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:07:00,225 INFO L225 Difference]: With dead ends: 152 [2022-11-26 00:07:00,226 INFO L226 Difference]: Without dead ends: 105 [2022-11-26 00:07:00,227 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 970 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1750, Invalid=2942, Unknown=0, NotChecked=0, Total=4692 [2022-11-26 00:07:00,228 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:07:00,228 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 102 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:07:00,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-11-26 00:07:00,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2022-11-26 00:07:00,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 97 states have (on average 1.1030927835051547) internal successors, (107), 98 states have internal predecessors, (107), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:07:00,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 117 transitions. [2022-11-26 00:07:00,243 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 117 transitions. Word has length 54 [2022-11-26 00:07:00,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:07:00,243 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 117 transitions. [2022-11-26 00:07:00,244 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 59 states have internal predecessors, (74), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:07:00,244 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 117 transitions. [2022-11-26 00:07:00,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-11-26 00:07:00,245 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:07:00,245 INFO L195 NwaCegarLoop]: trace histogram [56, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:07:00,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-26 00:07:00,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:07:00,455 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:07:00,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:07:00,456 INFO L85 PathProgramCache]: Analyzing trace with hash -1753325212, now seen corresponding path program 7 times [2022-11-26 00:07:00,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:07:00,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887497275] [2022-11-26 00:07:00,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:07:00,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:07:00,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:07:03,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 2 proven. 1596 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2022-11-26 00:07:03,599 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:07:03,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887497275] [2022-11-26 00:07:03,599 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [887497275] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:07:03,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597855978] [2022-11-26 00:07:03,599 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:07:03,599 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:07:03,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:07:03,601 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:07:03,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-26 00:07:03,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:07:03,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-26 00:07:03,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:07:03,942 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-26 00:07:03,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:07:08,099 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 2 proven. 1596 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2022-11-26 00:07:08,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597855978] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:07:08,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1796383960] [2022-11-26 00:07:08,103 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-26 00:07:08,103 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:07:08,104 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:07:08,104 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:07:08,104 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:07:08,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:08,134 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-26 00:07:08,136 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-26 00:07:08,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:08,165 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:07:08,165 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:07:08,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:08,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:07:08,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:08,224 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:07:08,248 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:07:08,248 INFO L350 Elim1Store]: Elim1 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 192 treesize of output 191 [2022-11-26 00:07:08,311 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:07:08,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:08,351 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-26 00:07:08,461 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-26 00:07:08,484 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:07:09,046 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4543#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:07:09,046 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:07:09,046 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:07:09,046 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 59] total 117 [2022-11-26 00:07:09,047 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439245276] [2022-11-26 00:07:09,047 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:07:09,047 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2022-11-26 00:07:09,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:07:09,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2022-11-26 00:07:09,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6825, Invalid=9177, Unknown=0, NotChecked=0, Total=16002 [2022-11-26 00:07:09,055 INFO L87 Difference]: Start difference. First operand 105 states and 117 transitions. Second operand has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 117 states have internal predecessors, (132), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:07:09,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:07:09,327 INFO L93 Difference]: Finished difference Result 210 states and 291 transitions. [2022-11-26 00:07:09,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2022-11-26 00:07:09,328 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 117 states have internal predecessors, (132), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 83 [2022-11-26 00:07:09,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:07:09,329 INFO L225 Difference]: With dead ends: 210 [2022-11-26 00:07:09,329 INFO L226 Difference]: Without dead ends: 163 [2022-11-26 00:07:09,333 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 181 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1956 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=6825, Invalid=9177, Unknown=0, NotChecked=0, Total=16002 [2022-11-26 00:07:09,333 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:07:09,334 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 153 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:07:09,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-11-26 00:07:09,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2022-11-26 00:07:09,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 155 states have (on average 1.064516129032258) internal successors, (165), 156 states have internal predecessors, (165), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:07:09,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 175 transitions. [2022-11-26 00:07:09,355 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 175 transitions. Word has length 83 [2022-11-26 00:07:09,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:07:09,356 INFO L495 AbstractCegarLoop]: Abstraction has 163 states and 175 transitions. [2022-11-26 00:07:09,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 117 states have internal predecessors, (132), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:07:09,356 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 175 transitions. [2022-11-26 00:07:09,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2022-11-26 00:07:09,358 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:07:09,358 INFO L195 NwaCegarLoop]: trace histogram [114, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:07:09,369 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-26 00:07:09,564 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:07:09,564 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:07:09,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:07:09,565 INFO L85 PathProgramCache]: Analyzing trace with hash 828844548, now seen corresponding path program 8 times [2022-11-26 00:07:09,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:07:09,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099363755] [2022-11-26 00:07:09,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:07:09,566 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:07:09,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:07:19,017 INFO L134 CoverageAnalysis]: Checked inductivity of 6614 backedges. 2 proven. 6555 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2022-11-26 00:07:19,017 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:07:19,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099363755] [2022-11-26 00:07:19,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2099363755] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:07:19,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [931894932] [2022-11-26 00:07:19,018 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:07:19,018 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:07:19,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:07:19,027 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:07:19,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-26 00:07:19,310 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-26 00:07:19,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:07:19,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-26 00:07:19,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:07:19,976 INFO L134 CoverageAnalysis]: Checked inductivity of 6614 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 6559 trivial. 0 not checked. [2022-11-26 00:07:19,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:07:20,757 INFO L134 CoverageAnalysis]: Checked inductivity of 6614 backedges. 2 proven. 55 refuted. 0 times theorem prover too weak. 6557 trivial. 0 not checked. [2022-11-26 00:07:20,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [931894932] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:07:20,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [7796145] [2022-11-26 00:07:20,759 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-26 00:07:20,760 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:07:20,760 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:07:20,760 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:07:20,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:07:20,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:20,788 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-26 00:07:20,789 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-26 00:07:20,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:20,810 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:07:20,810 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:07:20,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:20,829 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:07:20,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:20,870 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:07:20,891 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:07:20,891 INFO L350 Elim1Store]: Elim1 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 192 treesize of output 191 [2022-11-26 00:07:20,955 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:07:20,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:20,991 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-26 00:07:21,090 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-26 00:07:21,105 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:07:22,111 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6242#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:07:22,111 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:07:22,111 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:07:22,111 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 14, 14] total 141 [2022-11-26 00:07:22,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689406089] [2022-11-26 00:07:22,112 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:07:22,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 141 states [2022-11-26 00:07:22,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:07:22,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2022-11-26 00:07:22,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7117, Invalid=15533, Unknown=0, NotChecked=0, Total=22650 [2022-11-26 00:07:22,121 INFO L87 Difference]: Start difference. First operand 163 states and 175 transitions. Second operand has 141 states, 141 states have (on average 1.1205673758865249) internal successors, (158), 141 states have internal predecessors, (158), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:07:31,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:07:31,696 INFO L93 Difference]: Finished difference Result 237 states and 285 transitions. [2022-11-26 00:07:31,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 152 states. [2022-11-26 00:07:31,697 INFO L78 Accepts]: Start accepts. Automaton has has 141 states, 141 states have (on average 1.1205673758865249) internal successors, (158), 141 states have internal predecessors, (158), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 141 [2022-11-26 00:07:31,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:07:31,699 INFO L225 Difference]: With dead ends: 237 [2022-11-26 00:07:31,699 INFO L226 Difference]: Without dead ends: 190 [2022-11-26 00:07:31,708 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 389 SyntacticMatches, 0 SemanticMatches, 297 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17423 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=21715, Invalid=67387, Unknown=0, NotChecked=0, Total=89102 [2022-11-26 00:07:31,709 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 309 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 308 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 312 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:07:31,709 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [312 Valid, 157 Invalid, 313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 308 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-26 00:07:31,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2022-11-26 00:07:31,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 182. [2022-11-26 00:07:31,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 174 states have (on average 1.0574712643678161) internal successors, (184), 175 states have internal predecessors, (184), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:07:31,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 194 transitions. [2022-11-26 00:07:31,733 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 194 transitions. Word has length 141 [2022-11-26 00:07:31,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:07:31,734 INFO L495 AbstractCegarLoop]: Abstraction has 182 states and 194 transitions. [2022-11-26 00:07:31,734 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 141 states, 141 states have (on average 1.1205673758865249) internal successors, (158), 141 states have internal predecessors, (158), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:07:31,735 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 194 transitions. [2022-11-26 00:07:31,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2022-11-26 00:07:31,736 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:07:31,736 INFO L195 NwaCegarLoop]: trace histogram [115, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:07:31,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-26 00:07:31,942 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-26 00:07:31,943 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:07:31,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:07:31,943 INFO L85 PathProgramCache]: Analyzing trace with hash -2001117683, now seen corresponding path program 9 times [2022-11-26 00:07:31,943 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:07:31,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1791868518] [2022-11-26 00:07:31,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:07:31,944 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:07:32,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:07:40,762 INFO L134 CoverageAnalysis]: Checked inductivity of 6927 backedges. 2 proven. 6670 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2022-11-26 00:07:40,762 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:07:40,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1791868518] [2022-11-26 00:07:40,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1791868518] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:07:40,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1469956737] [2022-11-26 00:07:40,763 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:07:40,763 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:07:40,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:07:40,764 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:07:40,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-26 00:07:41,103 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:07:41,103 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:07:41,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 1210 conjuncts, 117 conjunts are in the unsatisfiable core [2022-11-26 00:07:41,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:07:41,359 INFO L134 CoverageAnalysis]: Checked inductivity of 6927 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2022-11-26 00:07:41,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:07:57,590 INFO L134 CoverageAnalysis]: Checked inductivity of 6927 backedges. 2 proven. 6670 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2022-11-26 00:07:57,590 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1469956737] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:07:57,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1979571060] [2022-11-26 00:07:57,592 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-26 00:07:57,592 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:07:57,593 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:07:57,593 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:07:57,593 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:07:57,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:57,620 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:07:57,620 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:07:57,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:57,629 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-26 00:07:57,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:57,644 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:07:57,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:57,684 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:07:57,706 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:07:57,707 INFO L350 Elim1Store]: Elim1 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 192 treesize of output 191 [2022-11-26 00:07:57,815 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:07:57,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:07:57,851 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-26 00:07:57,953 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-26 00:07:57,966 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:07:58,909 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8499#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:07:58,909 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:07:58,910 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:07:58,910 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [118, 117, 118] total 235 [2022-11-26 00:07:58,910 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120584807] [2022-11-26 00:07:58,910 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:07:58,911 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 235 states [2022-11-26 00:07:58,911 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:07:58,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 235 interpolants. [2022-11-26 00:07:58,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27534, Invalid=32246, Unknown=0, NotChecked=0, Total=59780 [2022-11-26 00:07:58,921 INFO L87 Difference]: Start difference. First operand 182 states and 194 transitions. Second operand has 235 states, 235 states have (on average 1.0638297872340425) internal successors, (250), 235 states have internal predecessors, (250), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:07:59,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:07:59,795 INFO L93 Difference]: Finished difference Result 364 states and 504 transitions. [2022-11-26 00:07:59,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 234 states. [2022-11-26 00:07:59,796 INFO L78 Accepts]: Start accepts. Automaton has has 235 states, 235 states have (on average 1.0638297872340425) internal successors, (250), 235 states have internal predecessors, (250), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 154 [2022-11-26 00:07:59,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:07:59,797 INFO L225 Difference]: With dead ends: 364 [2022-11-26 00:07:59,797 INFO L226 Difference]: Without dead ends: 299 [2022-11-26 00:07:59,804 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 243 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3962 ImplicationChecksByTransitivity, 22.4s TimeCoverageRelationStatistics Valid=27534, Invalid=32246, Unknown=0, NotChecked=0, Total=59780 [2022-11-26 00:07:59,805 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:07:59,805 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 85 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:07:59,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2022-11-26 00:07:59,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2022-11-26 00:07:59,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 291 states have (on average 1.034364261168385) internal successors, (301), 292 states have internal predecessors, (301), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:07:59,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 311 transitions. [2022-11-26 00:07:59,841 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 311 transitions. Word has length 154 [2022-11-26 00:07:59,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:07:59,842 INFO L495 AbstractCegarLoop]: Abstraction has 299 states and 311 transitions. [2022-11-26 00:07:59,842 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 235 states, 235 states have (on average 1.0638297872340425) internal successors, (250), 235 states have internal predecessors, (250), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:07:59,842 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 311 transitions. [2022-11-26 00:07:59,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2022-11-26 00:07:59,845 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:07:59,845 INFO L195 NwaCegarLoop]: trace histogram [232, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:07:59,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-26 00:08:00,050 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:08:00,050 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:08:00,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:08:00,051 INFO L85 PathProgramCache]: Analyzing trace with hash 726256996, now seen corresponding path program 10 times [2022-11-26 00:08:00,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:08:00,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169619056] [2022-11-26 00:08:00,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:08:00,051 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:08:00,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:08:32,428 INFO L134 CoverageAnalysis]: Checked inductivity of 27285 backedges. 2 proven. 27028 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2022-11-26 00:08:32,429 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:08:32,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169619056] [2022-11-26 00:08:32,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169619056] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:08:32,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1546896160] [2022-11-26 00:08:32,429 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:08:32,429 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:08:32,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:08:32,430 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:08:32,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-26 00:08:33,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:08:33,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 2263 conjuncts, 234 conjunts are in the unsatisfiable core [2022-11-26 00:08:33,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:08:33,465 INFO L134 CoverageAnalysis]: Checked inductivity of 27285 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2022-11-26 00:08:33,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:09:38,512 INFO L134 CoverageAnalysis]: Checked inductivity of 27285 backedges. 2 proven. 27028 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2022-11-26 00:09:38,513 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1546896160] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:09:38,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1383905338] [2022-11-26 00:09:38,515 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-26 00:09:38,515 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:09:38,515 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:09:38,515 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:09:38,516 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:09:38,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:38,542 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:09:38,542 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:09:38,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:38,553 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-26 00:09:38,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:38,568 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-26 00:09:38,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:38,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:38,623 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-26 00:09:38,624 INFO L350 Elim1Store]: Elim1 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 202 treesize of output 190 [2022-11-26 00:09:38,659 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:09:38,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:09:38,698 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-26 00:09:38,805 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-26 00:09:38,817 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:09:40,507 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11886#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:09:40,507 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:09:40,507 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:09:40,507 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [235, 234, 235] total 469 [2022-11-26 00:09:40,508 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725273827] [2022-11-26 00:09:40,508 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:09:40,509 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 469 states [2022-11-26 00:09:40,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:09:40,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 469 interpolants. [2022-11-26 00:09:40,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109785, Invalid=119177, Unknown=0, NotChecked=0, Total=228962 [2022-11-26 00:09:40,551 INFO L87 Difference]: Start difference. First operand 299 states and 311 transitions. Second operand has 469 states, 469 states have (on average 1.0319829424307037) internal successors, (484), 469 states have internal predecessors, (484), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:09:44,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:09:44,401 INFO L93 Difference]: Finished difference Result 598 states and 855 transitions. [2022-11-26 00:09:44,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 468 states. [2022-11-26 00:09:44,402 INFO L78 Accepts]: Start accepts. Automaton has has 469 states, 469 states have (on average 1.0319829424307037) internal successors, (484), 469 states have internal predecessors, (484), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 271 [2022-11-26 00:09:44,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:09:44,404 INFO L225 Difference]: With dead ends: 598 [2022-11-26 00:09:44,405 INFO L226 Difference]: Without dead ends: 533 [2022-11-26 00:09:44,416 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1046 GetRequests, 569 SyntacticMatches, 0 SemanticMatches, 477 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7940 ImplicationChecksByTransitivity, 87.4s TimeCoverageRelationStatistics Valid=109785, Invalid=119177, Unknown=0, NotChecked=0, Total=228962 [2022-11-26 00:09:44,416 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 546 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 546 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 00:09:44,417 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 119 Invalid, 547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 546 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 00:09:44,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2022-11-26 00:09:44,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 533. [2022-11-26 00:09:44,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 533 states, 525 states have (on average 1.019047619047619) internal successors, (535), 526 states have internal predecessors, (535), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:09:44,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 533 states to 533 states and 545 transitions. [2022-11-26 00:09:44,470 INFO L78 Accepts]: Start accepts. Automaton has 533 states and 545 transitions. Word has length 271 [2022-11-26 00:09:44,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:09:44,471 INFO L495 AbstractCegarLoop]: Abstraction has 533 states and 545 transitions. [2022-11-26 00:09:44,472 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 469 states, 469 states have (on average 1.0319829424307037) internal successors, (484), 469 states have internal predecessors, (484), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:09:44,472 INFO L276 IsEmpty]: Start isEmpty. Operand 533 states and 545 transitions. [2022-11-26 00:09:44,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2022-11-26 00:09:44,482 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:09:44,482 INFO L195 NwaCegarLoop]: trace histogram [466, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:09:44,493 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-26 00:09:44,692 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-26 00:09:44,693 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:09:44,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:09:44,693 INFO L85 PathProgramCache]: Analyzing trace with hash 1184737540, now seen corresponding path program 11 times [2022-11-26 00:09:44,693 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:09:44,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770669139] [2022-11-26 00:09:44,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:09:44,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:09:46,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:12:03,736 INFO L134 CoverageAnalysis]: Checked inductivity of 109068 backedges. 2 proven. 108811 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2022-11-26 00:12:03,736 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:12:03,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770669139] [2022-11-26 00:12:03,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [770669139] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:12:03,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1882563033] [2022-11-26 00:12:03,737 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:12:03,737 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:12:03,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:12:03,746 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:12:03,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-26 00:12:06,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-26 00:12:06,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:12:06,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-26 00:12:06,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:12:11,351 INFO L134 CoverageAnalysis]: Checked inductivity of 109068 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 108815 trivial. 0 not checked. [2022-11-26 00:12:11,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:12:16,644 INFO L134 CoverageAnalysis]: Checked inductivity of 109068 backedges. 2 proven. 253 refuted. 0 times theorem prover too weak. 108813 trivial. 0 not checked. [2022-11-26 00:12:16,645 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1882563033] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:12:16,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1561072576] [2022-11-26 00:12:16,647 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-26 00:12:16,647 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:12:16,647 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:12:16,647 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:12:16,648 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:12:16,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:12:16,667 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-26 00:12:16,668 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-26 00:12:16,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:12:16,690 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:12:16,691 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:12:16,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:12:16,707 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-26 00:12:16,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:12:16,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:12:16,759 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-26 00:12:16,759 INFO L350 Elim1Store]: Elim1 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 202 treesize of output 190 [2022-11-26 00:12:16,802 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:12:16,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:12:16,841 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2022-11-26 00:12:16,951 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-26 00:12:16,964 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:12:20,262 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17661#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:12:20,262 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:12:20,262 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:12:20,263 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [469, 26, 26] total 517 [2022-11-26 00:12:20,263 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772806614] [2022-11-26 00:12:20,263 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:12:20,264 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 517 states [2022-11-26 00:12:20,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:12:20,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 517 interpolants. [2022-11-26 00:12:20,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110929, Invalid=166273, Unknown=0, NotChecked=0, Total=277202 [2022-11-26 00:12:20,293 INFO L87 Difference]: Start difference. First operand 533 states and 545 transitions. Second operand has 517 states, 517 states have (on average 1.0328820116054158) internal successors, (534), 517 states have internal predecessors, (534), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:14:25,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:14:25,980 INFO L93 Difference]: Finished difference Result 643 states and 709 transitions. [2022-11-26 00:14:25,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 540 states. [2022-11-26 00:14:25,981 INFO L78 Accepts]: Start accepts. Automaton has has 517 states, 517 states have (on average 1.0328820116054158) internal successors, (534), 517 states have internal predecessors, (534), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 505 [2022-11-26 00:14:25,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:14:25,987 INFO L225 Difference]: With dead ends: 643 [2022-11-26 00:14:25,987 INFO L226 Difference]: Without dead ends: 578 [2022-11-26 00:14:26,072 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2518 GetRequests, 1457 SyntacticMatches, 0 SemanticMatches, 1061 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185697 ImplicationChecksByTransitivity, 219.7s TimeCoverageRelationStatistics Valid=334589, Invalid=794317, Unknown=0, NotChecked=0, Total=1128906 [2022-11-26 00:14:26,073 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 553 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 730 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 556 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 733 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 730 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-26 00:14:26,073 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [556 Valid, 202 Invalid, 733 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 730 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-26 00:14:26,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 578 states. [2022-11-26 00:14:26,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 578 to 570. [2022-11-26 00:14:26,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 570 states, 562 states have (on average 1.0177935943060499) internal successors, (572), 563 states have internal predecessors, (572), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:14:26,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 570 states to 570 states and 582 transitions. [2022-11-26 00:14:26,179 INFO L78 Accepts]: Start accepts. Automaton has 570 states and 582 transitions. Word has length 505 [2022-11-26 00:14:26,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:14:26,180 INFO L495 AbstractCegarLoop]: Abstraction has 570 states and 582 transitions. [2022-11-26 00:14:26,181 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 517 states, 517 states have (on average 1.0328820116054158) internal successors, (534), 517 states have internal predecessors, (534), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-26 00:14:26,181 INFO L276 IsEmpty]: Start isEmpty. Operand 570 states and 582 transitions. [2022-11-26 00:14:26,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 531 [2022-11-26 00:14:26,196 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:14:26,196 INFO L195 NwaCegarLoop]: trace histogram [467, 46, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:14:26,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-26 00:14:26,405 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-26 00:14:26,406 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:14:26,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:14:26,406 INFO L85 PathProgramCache]: Analyzing trace with hash 704626445, now seen corresponding path program 12 times [2022-11-26 00:14:26,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:14:26,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857732516] [2022-11-26 00:14:26,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:14:26,407 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:14:27,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:16:47,820 INFO L134 CoverageAnalysis]: Checked inductivity of 110363 backedges. 2 proven. 109278 refuted. 0 times theorem prover too weak. 1083 trivial. 0 not checked. [2022-11-26 00:16:47,820 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:16:47,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857732516] [2022-11-26 00:16:47,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [857732516] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:16:47,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072465803] [2022-11-26 00:16:47,821 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:16:47,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:16:47,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:16:47,823 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:16:47,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d77c55a-2bfa-4b0c-a792-9a21e673e34d/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-26 00:16:49,033 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:16:49,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:16:49,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 4474 conjuncts, 469 conjunts are in the unsatisfiable core [2022-11-26 00:16:49,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:16:49,899 INFO L134 CoverageAnalysis]: Checked inductivity of 110363 backedges. 0 proven. 109278 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2022-11-26 00:16:49,900 INFO L328 TraceCheckSpWp]: Computing backward predicates...