./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.3.ufo.BOUNDED-6.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/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_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.3.ufo.BOUNDED-6.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/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_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/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 c3ae342bfdc7bf76083bf4321cb5b6b26fe707bda9cd6edf475282aebbd1033a --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:40:34,722 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:40:34,726 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:40:34,781 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:40:34,782 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:40:34,787 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:40:34,789 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:40:34,793 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:40:34,796 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:40:34,801 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:40:34,803 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:40:34,805 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:40:34,805 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:40:34,808 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:40:34,810 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:40:34,815 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:40:34,817 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:40:34,818 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:40:34,821 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:40:34,829 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:40:34,831 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:40:34,833 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:40:34,836 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:40:34,837 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:40:34,846 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:40:34,847 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:40:34,847 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:40:34,849 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:40:34,850 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:40:34,852 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:40:34,852 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:40:34,853 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:40:34,855 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:40:34,856 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:40:34,857 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:40:34,858 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:40:34,858 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:40:34,859 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:40:34,859 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:40:34,860 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:40:34,861 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:40:34,861 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:40:34,905 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:40:34,906 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:40:34,907 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:40:34,907 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:40:34,914 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:40:34,914 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:40:34,914 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:40:34,915 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:40:34,915 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:40:34,915 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:40:34,916 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:40:34,916 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:40:34,917 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:40:34,917 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:40:34,917 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:40:34,917 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:40:34,918 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:40:34,918 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:40:34,919 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:40:34,919 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:40:34,919 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:40:34,919 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:40:34,920 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:40:34,920 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:40:34,920 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:40:34,920 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:40:34,922 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:40:34,922 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:40:34,922 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:40:34,923 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:40:34,923 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:40:34,923 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:40:34,923 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:40:34,924 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:40:34,924 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:40:34,924 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:40:34,924 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:40:34,925 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:40:34,925 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:40:34,925 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:40:34,925 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:40:34,926 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_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c3ae342bfdc7bf76083bf4321cb5b6b26fe707bda9cd6edf475282aebbd1033a [2021-11-25 20:40:35,161 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:40:35,181 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:40:35,184 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:40:35,185 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:40:35,189 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:40:35,191 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.3.ufo.BOUNDED-6.pals.c [2021-11-25 20:40:35,267 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7/data/7115a4cf9/4370ff5a99284423a9f053f5473b4b99/FLAG3c1f15d92 [2021-11-25 20:40:35,867 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:40:35,868 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.3.ufo.BOUNDED-6.pals.c [2021-11-25 20:40:35,895 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7/data/7115a4cf9/4370ff5a99284423a9f053f5473b4b99/FLAG3c1f15d92 [2021-11-25 20:40:36,179 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7/data/7115a4cf9/4370ff5a99284423a9f053f5473b4b99 [2021-11-25 20:40:36,182 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:40:36,183 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:40:36,185 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:40:36,185 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:40:36,198 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:40:36,199 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:40:36" (1/1) ... [2021-11-25 20:40:36,200 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@499122e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:40:36, skipping insertion in model container [2021-11-25 20:40:36,200 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:40:36" (1/1) ... [2021-11-25 20:40:36,209 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:40:36,261 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:40:36,529 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_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.3.ufo.BOUNDED-6.pals.c[12764,12777] [2021-11-25 20:40:36,532 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:40:36,541 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:40:36,610 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_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.3.ufo.BOUNDED-6.pals.c[12764,12777] [2021-11-25 20:40:36,611 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:40:36,629 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:40:36,629 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:40:36 WrapperNode [2021-11-25 20:40:36,629 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:40:36,631 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:40:36,631 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:40:36,631 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:40:36,638 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:40:36" (1/1) ... [2021-11-25 20:40:36,660 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:40:36" (1/1) ... [2021-11-25 20:40:36,701 INFO L137 Inliner]: procedures = 21, calls = 13, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 441 [2021-11-25 20:40:36,701 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:40:36,702 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:40:36,702 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:40:36,702 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:40:36,711 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:40:36" (1/1) ... [2021-11-25 20:40:36,711 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:40:36" (1/1) ... [2021-11-25 20:40:36,715 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:40:36" (1/1) ... [2021-11-25 20:40:36,716 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:40:36" (1/1) ... [2021-11-25 20:40:36,726 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:40:36" (1/1) ... [2021-11-25 20:40:36,734 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:40:36" (1/1) ... [2021-11-25 20:40:36,737 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:40:36" (1/1) ... [2021-11-25 20:40:36,742 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:40:36,743 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:40:36,743 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:40:36,743 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:40:36,758 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:40:36" (1/1) ... [2021-11-25 20:40:36,768 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:40:36,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:36,811 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:40:36,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:40:36,847 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:40:36,847 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:40:36,847 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:40:36,847 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:40:36,950 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:40:36,951 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:40:37,554 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:40:38,148 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:40:38,149 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 20:40:38,151 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:40:38 BoogieIcfgContainer [2021-11-25 20:40:38,152 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:40:38,153 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:40:38,154 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:40:38,158 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:40:38,158 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:40:36" (1/3) ... [2021-11-25 20:40:38,159 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43b431cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:40:38, skipping insertion in model container [2021-11-25 20:40:38,159 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:40:36" (2/3) ... [2021-11-25 20:40:38,160 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43b431cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:40:38, skipping insertion in model container [2021-11-25 20:40:38,160 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:40:38" (3/3) ... [2021-11-25 20:40:38,161 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_floodmax.3.3.ufo.BOUNDED-6.pals.c [2021-11-25 20:40:38,167 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:40:38,167 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:40:38,231 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:40:38,247 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 20:40:38,247 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:40:38,272 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 18 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:38,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 20:40:38,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:38,283 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 20:40:38,284 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:38,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:38,289 INFO L85 PathProgramCache]: Analyzing trace with hash -875501389, now seen corresponding path program 1 times [2021-11-25 20:40:38,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:38,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2137454028] [2021-11-25 20:40:38,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:38,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:38,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:39,057 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 20:40:39,058 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:39,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2137454028] [2021-11-25 20:40:39,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2137454028] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:40:39,059 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:40:39,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:40:39,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713735942] [2021-11-25 20:40:39,062 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:40:39,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:40:39,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:39,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:40:39,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:40:39,103 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 18 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:39,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:39,247 INFO L93 Difference]: Finished difference Result 57 states and 90 transitions. [2021-11-25 20:40:39,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:40:39,250 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 20:40:39,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:39,260 INFO L225 Difference]: With dead ends: 57 [2021-11-25 20:40:39,260 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 20:40:39,263 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:40:39,269 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 26 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:39,270 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 38 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:40:39,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 20:40:39,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 26. [2021-11-25 20:40:39,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:39,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 41 transitions. [2021-11-25 20:40:39,310 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 41 transitions. Word has length 6 [2021-11-25 20:40:39,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:39,311 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 41 transitions. [2021-11-25 20:40:39,311 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:39,313 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 41 transitions. [2021-11-25 20:40:39,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 20:40:39,314 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:39,314 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:39,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:40:39,315 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:39,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:39,317 INFO L85 PathProgramCache]: Analyzing trace with hash -1433431498, now seen corresponding path program 1 times [2021-11-25 20:40:39,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:39,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766559117] [2021-11-25 20:40:39,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:39,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:39,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:39,626 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 20:40:39,626 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:39,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766559117] [2021-11-25 20:40:39,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766559117] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:40:39,627 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:40:39,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:40:39,627 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128049539] [2021-11-25 20:40:39,628 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:40:39,629 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:40:39,629 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:39,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:40:39,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:40:39,630 INFO L87 Difference]: Start difference. First operand 26 states and 41 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:39,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:39,768 INFO L93 Difference]: Finished difference Result 63 states and 93 transitions. [2021-11-25 20:40:39,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:40:39,769 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 20:40:39,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:39,770 INFO L225 Difference]: With dead ends: 63 [2021-11-25 20:40:39,770 INFO L226 Difference]: Without dead ends: 44 [2021-11-25 20:40:39,771 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:40:39,772 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 67 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:39,773 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 40 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:40:39,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-25 20:40:39,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 26. [2021-11-25 20:40:39,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:39,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 40 transitions. [2021-11-25 20:40:39,780 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 40 transitions. Word has length 7 [2021-11-25 20:40:39,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:39,780 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 40 transitions. [2021-11-25 20:40:39,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:39,781 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 40 transitions. [2021-11-25 20:40:39,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 20:40:39,781 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:39,781 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:39,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 20:40:39,782 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:39,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:39,782 INFO L85 PathProgramCache]: Analyzing trace with hash -1543943940, now seen corresponding path program 1 times [2021-11-25 20:40:39,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:39,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061089262] [2021-11-25 20:40:39,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:39,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:39,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:40,065 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 20:40:40,066 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:40,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061089262] [2021-11-25 20:40:40,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061089262] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:40:40,068 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:40:40,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:40:40,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073741189] [2021-11-25 20:40:40,069 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:40:40,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:40:40,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:40,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:40:40,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:40:40,072 INFO L87 Difference]: Start difference. First operand 26 states and 40 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:40,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:40,167 INFO L93 Difference]: Finished difference Result 57 states and 86 transitions. [2021-11-25 20:40:40,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:40:40,168 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 20:40:40,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:40,169 INFO L225 Difference]: With dead ends: 57 [2021-11-25 20:40:40,169 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 20:40:40,169 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:40:40,171 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 20 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:40,172 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 45 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:40:40,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 20:40:40,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 26. [2021-11-25 20:40:40,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:40,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 39 transitions. [2021-11-25 20:40:40,178 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 39 transitions. Word has length 8 [2021-11-25 20:40:40,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:40,179 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 39 transitions. [2021-11-25 20:40:40,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:40,179 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 39 transitions. [2021-11-25 20:40:40,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 20:40:40,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:40,180 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:40,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 20:40:40,180 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:40,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:40,181 INFO L85 PathProgramCache]: Analyzing trace with hash -669410593, now seen corresponding path program 1 times [2021-11-25 20:40:40,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:40,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346022023] [2021-11-25 20:40:40,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:40,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:40,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:40,459 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 20:40:40,459 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:40,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346022023] [2021-11-25 20:40:40,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [346022023] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:40:40,459 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:40:40,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:40:40,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285993986] [2021-11-25 20:40:40,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:40:40,461 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:40:40,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:40,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:40:40,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:40:40,462 INFO L87 Difference]: Start difference. First operand 26 states and 39 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:40,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:40,563 INFO L93 Difference]: Finished difference Result 57 states and 85 transitions. [2021-11-25 20:40:40,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:40:40,564 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 20:40:40,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:40,566 INFO L225 Difference]: With dead ends: 57 [2021-11-25 20:40:40,566 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 20:40:40,567 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:40:40,576 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 18 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:40,576 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 43 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:40:40,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 20:40:40,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 26. [2021-11-25 20:40:40,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.52) internal successors, (38), 25 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:40,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 38 transitions. [2021-11-25 20:40:40,582 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 38 transitions. Word has length 9 [2021-11-25 20:40:40,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:40,582 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 38 transitions. [2021-11-25 20:40:40,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:40,582 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 38 transitions. [2021-11-25 20:40:40,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 20:40:40,583 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:40,583 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:40,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 20:40:40,584 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:40,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:40,584 INFO L85 PathProgramCache]: Analyzing trace with hash -533879897, now seen corresponding path program 1 times [2021-11-25 20:40:40,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:40,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25683398] [2021-11-25 20:40:40,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:40,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:40,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:40,765 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 20:40:40,765 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:40,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25683398] [2021-11-25 20:40:40,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [25683398] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:40:40,767 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:40:40,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:40:40,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558992757] [2021-11-25 20:40:40,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:40:40,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:40:40,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:40,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:40:40,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:40:40,770 INFO L87 Difference]: Start difference. First operand 26 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:40,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:40,850 INFO L93 Difference]: Finished difference Result 55 states and 81 transitions. [2021-11-25 20:40:40,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:40:40,851 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 20:40:40,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:40,853 INFO L225 Difference]: With dead ends: 55 [2021-11-25 20:40:40,853 INFO L226 Difference]: Without dead ends: 36 [2021-11-25 20:40:40,854 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:40:40,857 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 15 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:40,858 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 42 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:40:40,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-25 20:40:40,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2021-11-25 20:40:40,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:40,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 39 transitions. [2021-11-25 20:40:40,875 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 39 transitions. Word has length 11 [2021-11-25 20:40:40,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:40,876 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 39 transitions. [2021-11-25 20:40:40,876 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:40,876 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 39 transitions. [2021-11-25 20:40:40,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 20:40:40,880 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:40,880 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:40,880 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 20:40:40,880 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:40,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:40,881 INFO L85 PathProgramCache]: Analyzing trace with hash 541607603, now seen corresponding path program 1 times [2021-11-25 20:40:40,881 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:40,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271292930] [2021-11-25 20:40:40,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:40,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:41,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:41,119 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 20:40:41,119 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:41,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271292930] [2021-11-25 20:40:41,119 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271292930] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:40:41,120 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:40:41,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:40:41,120 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889927459] [2021-11-25 20:40:41,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:40:41,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:40:41,121 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:41,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:40:41,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:40:41,122 INFO L87 Difference]: Start difference. First operand 27 states and 39 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:41,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:41,192 INFO L93 Difference]: Finished difference Result 53 states and 77 transitions. [2021-11-25 20:40:41,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:40:41,192 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-25 20:40:41,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:41,195 INFO L225 Difference]: With dead ends: 53 [2021-11-25 20:40:41,195 INFO L226 Difference]: Without dead ends: 34 [2021-11-25 20:40:41,196 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:40:41,198 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 13 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:41,199 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 53 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:40:41,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-25 20:40:41,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 27. [2021-11-25 20:40:41,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:41,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2021-11-25 20:40:41,211 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 12 [2021-11-25 20:40:41,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:41,211 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2021-11-25 20:40:41,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:41,211 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2021-11-25 20:40:41,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 20:40:41,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:41,212 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:41,212 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 20:40:41,212 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:41,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:41,213 INFO L85 PathProgramCache]: Analyzing trace with hash -1989162823, now seen corresponding path program 1 times [2021-11-25 20:40:41,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:41,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373692807] [2021-11-25 20:40:41,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:41,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:41,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:41,434 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 20:40:41,434 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:41,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373692807] [2021-11-25 20:40:41,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373692807] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:40:41,435 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:40:41,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:40:41,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333856090] [2021-11-25 20:40:41,435 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:40:41,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:40:41,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:41,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:40:41,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:40:41,437 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:41,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:41,514 INFO L93 Difference]: Finished difference Result 56 states and 77 transitions. [2021-11-25 20:40:41,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:40:41,514 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 20:40:41,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:41,515 INFO L225 Difference]: With dead ends: 56 [2021-11-25 20:40:41,515 INFO L226 Difference]: Without dead ends: 37 [2021-11-25 20:40:41,516 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:40:41,517 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 7 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:41,517 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 45 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:40:41,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-25 20:40:41,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2021-11-25 20:40:41,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:41,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 40 transitions. [2021-11-25 20:40:41,533 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 40 transitions. Word has length 14 [2021-11-25 20:40:41,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:41,533 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 40 transitions. [2021-11-25 20:40:41,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:41,533 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 40 transitions. [2021-11-25 20:40:41,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 20:40:41,535 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:41,535 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:41,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 20:40:41,535 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:41,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:41,536 INFO L85 PathProgramCache]: Analyzing trace with hash -1546254974, now seen corresponding path program 1 times [2021-11-25 20:40:41,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:41,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109976541] [2021-11-25 20:40:41,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:41,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:41,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:41,656 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 20:40:41,656 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:41,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109976541] [2021-11-25 20:40:41,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109976541] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:40:41,657 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:40:41,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 20:40:41,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438103516] [2021-11-25 20:40:41,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:40:41,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:40:41,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:41,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:40:41,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:40:41,658 INFO L87 Difference]: Start difference. First operand 30 states and 40 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:41,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:41,786 INFO L93 Difference]: Finished difference Result 60 states and 80 transitions. [2021-11-25 20:40:41,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:40:41,787 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-25 20:40:41,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:41,787 INFO L225 Difference]: With dead ends: 60 [2021-11-25 20:40:41,787 INFO L226 Difference]: Without dead ends: 58 [2021-11-25 20:40:41,788 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-25 20:40:41,788 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 42 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:41,789 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 98 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:40:41,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-25 20:40:41,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 33. [2021-11-25 20:40:41,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.34375) internal successors, (43), 32 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:41,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2021-11-25 20:40:41,795 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 15 [2021-11-25 20:40:41,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:41,795 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2021-11-25 20:40:41,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:41,796 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2021-11-25 20:40:41,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 20:40:41,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:41,797 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:41,797 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 20:40:41,797 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:40:41,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:41,797 INFO L85 PathProgramCache]: Analyzing trace with hash -191284323, now seen corresponding path program 1 times [2021-11-25 20:40:41,798 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:41,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681554709] [2021-11-25 20:40:41,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:41,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:42,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:42,271 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:40:42,271 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:42,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681554709] [2021-11-25 20:40:42,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681554709] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:42,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637740573] [2021-11-25 20:40:42,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:42,272 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:42,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:42,278 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:40:42,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82ad3a31-ff1e-4ed5-95bd-89c773fa9903/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:40:42,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:42,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:40:42,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:40:56,028 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:40:56,029 INFO L328 TraceCheckSpWp]: Computing backward predicates...