./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound10.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound10.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 5d6ad2c11d3a75b8845224ed23d407062e615cc5bd2b5ad3e6646436a3e13805 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:33:35,298 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:33:35,300 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:33:35,351 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:33:35,352 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:33:35,353 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:33:35,355 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:33:35,357 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:33:35,360 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:33:35,361 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:33:35,362 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:33:35,363 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:33:35,364 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:33:35,365 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:33:35,367 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:33:35,368 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:33:35,369 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:33:35,371 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:33:35,373 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:33:35,376 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:33:35,378 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:33:35,385 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:33:35,386 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:33:35,387 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:33:35,391 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:33:35,392 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:33:35,392 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:33:35,393 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:33:35,394 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:33:35,395 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:33:35,395 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:33:35,396 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:33:35,397 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:33:35,398 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:33:35,399 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:33:35,400 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:33:35,401 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:33:35,401 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:33:35,401 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:33:35,402 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:33:35,403 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:33:35,404 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:33:35,434 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:33:35,434 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:33:35,435 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:33:35,435 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:33:35,436 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:33:35,436 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:33:35,436 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:33:35,436 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:33:35,437 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:33:35,437 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:33:35,437 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:33:35,437 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:33:35,437 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:33:35,438 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:33:35,438 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:33:35,438 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:33:35,438 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:33:35,439 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:33:35,439 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:33:35,439 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:33:35,440 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:33:35,440 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:33:35,440 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:33:35,440 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:33:35,440 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:33:35,441 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:33:35,441 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:33:35,441 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:33:35,441 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:33:35,441 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:33:35,442 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:33:35,442 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:33:35,442 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:33:35,442 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:33:35,442 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:33:35,443 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:33:35,443 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:33:35,443 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:33:35,443 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:33:35,443 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:33:35,443 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:33:35,444 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5d6ad2c11d3a75b8845224ed23d407062e615cc5bd2b5ad3e6646436a3e13805 [2021-11-25 18:33:35,697 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:33:35,718 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:33:35,721 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:33:35,722 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:33:35,723 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:33:35,725 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound10.i [2021-11-25 18:33:35,790 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/data/90825b029/d25dbc0fa8d547b595ef304a10e7479a/FLAGa089b47ca [2021-11-25 18:33:36,286 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:33:36,287 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound10.i [2021-11-25 18:33:36,293 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/data/90825b029/d25dbc0fa8d547b595ef304a10e7479a/FLAGa089b47ca [2021-11-25 18:33:36,633 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/data/90825b029/d25dbc0fa8d547b595ef304a10e7479a [2021-11-25 18:33:36,638 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:33:36,640 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:33:36,657 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:33:36,657 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:33:36,660 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:33:36,661 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:33:36" (1/1) ... [2021-11-25 18:33:36,662 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21ad126c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:33:36, skipping insertion in model container [2021-11-25 18:33:36,662 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:33:36" (1/1) ... [2021-11-25 18:33:36,670 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:33:36,685 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:33:36,885 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound10.i[951,964] [2021-11-25 18:33:36,899 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:33:36,907 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:33:36,920 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound10.i[951,964] [2021-11-25 18:33:36,926 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:33:36,939 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:33:36,940 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:33:36 WrapperNode [2021-11-25 18:33:36,940 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:33:36,941 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:33:36,941 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:33:36,942 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:33:36,950 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:33:36" (1/1) ... [2021-11-25 18:33:36,957 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:33:36" (1/1) ... [2021-11-25 18:33:36,975 INFO L137 Inliner]: procedures = 16, calls = 9, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 46 [2021-11-25 18:33:36,976 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:33:36,977 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:33:36,977 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:33:36,977 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:33:36,985 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:33:36" (1/1) ... [2021-11-25 18:33:36,986 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:33:36" (1/1) ... [2021-11-25 18:33:36,987 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:33:36" (1/1) ... [2021-11-25 18:33:36,988 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:33:36" (1/1) ... [2021-11-25 18:33:36,991 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:33:36" (1/1) ... [2021-11-25 18:33:36,995 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:33:36" (1/1) ... [2021-11-25 18:33:36,996 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:33:36" (1/1) ... [2021-11-25 18:33:36,998 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:33:36,999 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:33:36,999 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:33:36,999 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:33:37,000 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:33:36" (1/1) ... [2021-11-25 18:33:37,009 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:33:37,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:33:37,050 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:33:37,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:33:37,095 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:33:37,096 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:33:37,096 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:33:37,096 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:33:37,096 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 18:33:37,096 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 18:33:37,165 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:33:37,167 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:33:37,300 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:33:37,331 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:33:37,332 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 18:33:37,334 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:33:37 BoogieIcfgContainer [2021-11-25 18:33:37,335 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:33:37,336 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:33:37,336 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:33:37,340 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:33:37,340 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:33:36" (1/3) ... [2021-11-25 18:33:37,341 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c89abeb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:33:37, skipping insertion in model container [2021-11-25 18:33:37,341 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:33:36" (2/3) ... [2021-11-25 18:33:37,341 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c89abeb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:33:37, skipping insertion in model container [2021-11-25 18:33:37,342 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:33:37" (3/3) ... [2021-11-25 18:33:37,343 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_valuebound10.i [2021-11-25 18:33:37,348 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:33:37,348 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:33:37,391 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:33:37,399 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 18:33:37,399 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:33:37,415 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:33:37,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 18:33:37,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:33:37,421 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:33:37,421 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:33:37,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:33:37,427 INFO L85 PathProgramCache]: Analyzing trace with hash 1881233236, now seen corresponding path program 1 times [2021-11-25 18:33:37,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:33:37,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1592536842] [2021-11-25 18:33:37,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:33:37,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:33:37,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:33:37,568 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:33:37,569 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:33:37,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1592536842] [2021-11-25 18:33:37,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1592536842] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:33:37,570 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:33:37,570 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:33:37,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416174659] [2021-11-25 18:33:37,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:33:37,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 18:33:37,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:33:37,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 18:33:37,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 18:33:37,606 INFO L87 Difference]: Start difference. First operand has 15 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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) [2021-11-25 18:33:37,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:33:37,637 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2021-11-25 18:33:37,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 18:33:37,639 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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 7 [2021-11-25 18:33:37,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:33:37,647 INFO L225 Difference]: With dead ends: 27 [2021-11-25 18:33:37,647 INFO L226 Difference]: Without dead ends: 13 [2021-11-25 18:33:37,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 18:33:37,654 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:33:37,656 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:33:37,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-25 18:33:37,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-25 18:33:37,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:33:37,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-11-25 18:33:37,690 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 7 [2021-11-25 18:33:37,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:33:37,690 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-11-25 18:33:37,690 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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) [2021-11-25 18:33:37,691 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-11-25 18:33:37,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 18:33:37,691 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:33:37,691 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:33:37,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:33:37,692 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:33:37,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:33:37,693 INFO L85 PathProgramCache]: Analyzing trace with hash -515868340, now seen corresponding path program 1 times [2021-11-25 18:33:37,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:33:37,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382389472] [2021-11-25 18:33:37,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:33:37,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:33:37,713 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:33:37,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1060335874] [2021-11-25 18:33:37,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:33:37,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:33:37,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:33:37,716 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:33:37,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:33:37,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:33:37,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 18:33:37,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:33:38,114 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:33:38,114 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:33:38,114 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:33:38,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382389472] [2021-11-25 18:33:38,115 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:33:38,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1060335874] [2021-11-25 18:33:38,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1060335874] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:33:38,116 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:33:38,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:33:38,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108150305] [2021-11-25 18:33:38,117 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:33:38,118 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:33:38,118 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:33:38,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:33:38,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:33:38,119 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 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) [2021-11-25 18:33:40,210 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-25 18:33:40,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:33:40,397 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2021-11-25 18:33:40,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:33:40,397 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 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 8 [2021-11-25 18:33:40,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:33:40,398 INFO L225 Difference]: With dead ends: 25 [2021-11-25 18:33:40,399 INFO L226 Difference]: Without dead ends: 22 [2021-11-25 18:33:40,399 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:33:40,401 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 8 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:33:40,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 38 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 18:33:40,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-25 18:33:40,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-25 18:33:40,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:33:40,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-11-25 18:33:40,410 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 8 [2021-11-25 18:33:40,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:33:40,410 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-11-25 18:33:40,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 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) [2021-11-25 18:33:40,411 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-11-25 18:33:40,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 18:33:40,411 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:33:40,412 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:33:40,442 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:33:40,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:33:40,636 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:33:40,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:33:40,637 INFO L85 PathProgramCache]: Analyzing trace with hash -965242393, now seen corresponding path program 1 times [2021-11-25 18:33:40,637 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:33:40,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965809267] [2021-11-25 18:33:40,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:33:40,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:33:40,657 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:33:40,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [205525845] [2021-11-25 18:33:40,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:33:40,657 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:33:40,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:33:40,659 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:33:40,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:33:40,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:33:40,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 18:33:40,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:33:40,997 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:33:40,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:33:41,250 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:33:41,251 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:33:41,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965809267] [2021-11-25 18:33:41,251 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:33:41,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [205525845] [2021-11-25 18:33:41,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [205525845] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 18:33:41,252 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:33:41,252 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 7 [2021-11-25 18:33:41,252 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173503464] [2021-11-25 18:33:41,252 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:33:41,253 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:33:41,253 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:33:41,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:33:41,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:33:41,254 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 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) [2021-11-25 18:33:43,307 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-25 18:33:43,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:33:43,470 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2021-11-25 18:33:43,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:33:43,473 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 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 [2021-11-25 18:33:43,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:33:43,474 INFO L225 Difference]: With dead ends: 30 [2021-11-25 18:33:43,475 INFO L226 Difference]: Without dead ends: 28 [2021-11-25 18:33:43,475 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:33:43,477 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 6 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 7 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:33:43,478 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 48 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 1 Unknown, 7 Unchecked, 2.2s Time] [2021-11-25 18:33:43,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-25 18:33:43,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-25 18:33:43,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.2) internal successors, (24), 22 states have internal predecessors, (24), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 18:33:43,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2021-11-25 18:33:43,486 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 10 [2021-11-25 18:33:43,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:33:43,486 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2021-11-25 18:33:43,487 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 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) [2021-11-25 18:33:43,487 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2021-11-25 18:33:43,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 18:33:43,488 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:33:43,488 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:33:43,526 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:33:43,711 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:33:43,711 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:33:43,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:33:43,712 INFO L85 PathProgramCache]: Analyzing trace with hash -969972797, now seen corresponding path program 1 times [2021-11-25 18:33:43,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:33:43,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361265217] [2021-11-25 18:33:43,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:33:43,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:33:43,725 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:33:43,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1151183426] [2021-11-25 18:33:43,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:33:43,726 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:33:43,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:33:43,727 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:33:43,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:33:43,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:33:43,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 18:33:43,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:33:43,846 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:33:43,846 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:33:43,846 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:33:43,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361265217] [2021-11-25 18:33:43,847 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:33:43,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151183426] [2021-11-25 18:33:43,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1151183426] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:33:43,848 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:33:43,848 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:33:43,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667035502] [2021-11-25 18:33:43,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:33:43,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:33:43,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:33:43,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:33:43,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:33:43,850 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:33:43,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:33:43,913 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2021-11-25 18:33:43,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:33:43,915 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-11-25 18:33:43,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:33:43,915 INFO L225 Difference]: With dead ends: 38 [2021-11-25 18:33:43,916 INFO L226 Difference]: Without dead ends: 21 [2021-11-25 18:33:43,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:33:43,918 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:33:43,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:33:43,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-25 18:33:43,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-25 18:33:43,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.2) internal successors, (18), 17 states have internal predecessors, (18), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:33:43,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-11-25 18:33:43,925 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 15 [2021-11-25 18:33:43,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:33:43,925 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-11-25 18:33:43,925 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:33:43,926 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-11-25 18:33:43,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-25 18:33:43,926 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:33:43,927 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:33:43,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:33:44,152 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:33:44,153 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:33:44,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:33:44,153 INFO L85 PathProgramCache]: Analyzing trace with hash 2029469439, now seen corresponding path program 1 times [2021-11-25 18:33:44,153 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:33:44,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1959635915] [2021-11-25 18:33:44,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:33:44,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:33:44,166 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:33:44,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1471298130] [2021-11-25 18:33:44,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:33:44,166 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:33:44,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:33:44,189 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:33:44,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:33:44,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:33:44,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 18:33:44,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:33:44,354 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:33:44,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:33:44,553 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:33:44,554 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:33:44,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1959635915] [2021-11-25 18:33:44,554 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:33:44,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471298130] [2021-11-25 18:33:44,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471298130] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:33:44,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [20383982] [2021-11-25 18:33:44,600 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 18:33:44,600 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:33:44,605 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:33:44,611 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:33:44,612 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:33:45,049 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 49 for LOIs [2021-11-25 18:33:45,291 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:33:46,491 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '526#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:33:46,491 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:33:46,491 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:33:46,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-25 18:33:46,491 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986791685] [2021-11-25 18:33:46,492 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:33:46,492 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:33:46,492 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:33:46,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:33:46,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2021-11-25 18:33:46,493 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:33:47,938 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.43s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:33:50,013 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:33:50,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:33:50,179 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2021-11-25 18:33:50,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:33:50,179 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-11-25 18:33:50,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:33:50,180 INFO L225 Difference]: With dead ends: 27 [2021-11-25 18:33:50,180 INFO L226 Difference]: Without dead ends: 20 [2021-11-25 18:33:50,181 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-25 18:33:50,182 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:33:50,182 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 32 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 39 Invalid, 1 Unknown, 0 Unchecked, 3.6s Time] [2021-11-25 18:33:50,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-25 18:33:50,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-25 18:33:50,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:33:50,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-25 18:33:50,188 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2021-11-25 18:33:50,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:33:50,189 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-25 18:33:50,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:33:50,189 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-25 18:33:50,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-25 18:33:50,190 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:33:50,190 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:33:50,222 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:33:50,408 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:33:50,409 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:33:50,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:33:50,409 INFO L85 PathProgramCache]: Analyzing trace with hash -425494840, now seen corresponding path program 1 times [2021-11-25 18:33:50,409 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:33:50,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303632182] [2021-11-25 18:33:50,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:33:50,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:33:50,433 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:33:50,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [56559299] [2021-11-25 18:33:50,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:33:50,436 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:33:50,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:33:50,450 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:33:50,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4e0a0a0b-7c20-4332-94ca-727e6686d822/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process