./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.10.cil-2.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_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/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_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.10.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/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_410007a6-3d4d-43c8-9fca-210aa435a67b/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 6ba9401cadb8fecd59a1a331c94e3215cc972a92f03516bfd6c95164e3ec98a9 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 17:50:43,928 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 17:50:43,930 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 17:50:43,975 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 17:50:43,976 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 17:50:43,980 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 17:50:43,982 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 17:50:43,986 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 17:50:43,989 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 17:50:43,996 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 17:50:43,997 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 17:50:43,999 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 17:50:44,000 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 17:50:44,003 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 17:50:44,005 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 17:50:44,014 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 17:50:44,016 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 17:50:44,017 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 17:50:44,019 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 17:50:44,026 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 17:50:44,028 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 17:50:44,029 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 17:50:44,033 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 17:50:44,034 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 17:50:44,040 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 17:50:44,040 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 17:50:44,041 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 17:50:44,043 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 17:50:44,044 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 17:50:44,045 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 17:50:44,046 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 17:50:44,047 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 17:50:44,049 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 17:50:44,050 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 17:50:44,051 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 17:50:44,051 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 17:50:44,052 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 17:50:44,052 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 17:50:44,053 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 17:50:44,054 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 17:50:44,054 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 17:50:44,055 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 17:50:44,096 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 17:50:44,099 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 17:50:44,099 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 17:50:44,100 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 17:50:44,100 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 17:50:44,101 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 17:50:44,101 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 17:50:44,101 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 17:50:44,101 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 17:50:44,102 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 17:50:44,103 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 17:50:44,103 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 17:50:44,103 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 17:50:44,104 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 17:50:44,104 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 17:50:44,104 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 17:50:44,104 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 17:50:44,104 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 17:50:44,105 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 17:50:44,105 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 17:50:44,106 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 17:50:44,106 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 17:50:44,106 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 17:50:44,106 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 17:50:44,106 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 17:50:44,107 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 17:50:44,107 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 17:50:44,107 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 17:50:44,107 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 17:50:44,108 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 17:50:44,108 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 17:50:44,108 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 17:50:44,109 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:50:44,109 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 17:50:44,109 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 17:50:44,109 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 17:50:44,109 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 17:50:44,110 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 17:50:44,110 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 17:50:44,110 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 17:50:44,110 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 17:50:44,111 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_410007a6-3d4d-43c8-9fca-210aa435a67b/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6ba9401cadb8fecd59a1a331c94e3215cc972a92f03516bfd6c95164e3ec98a9 [2021-11-25 17:50:44,334 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 17:50:44,354 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 17:50:44,357 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 17:50:44,358 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 17:50:44,358 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 17:50:44,360 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/systemc/token_ring.10.cil-2.c [2021-11-25 17:50:44,427 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/data/3fd44f05c/1e0aed9e5bff405eabf4265773357919/FLAGe414c20ba [2021-11-25 17:50:44,944 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 17:50:44,945 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/sv-benchmarks/c/systemc/token_ring.10.cil-2.c [2021-11-25 17:50:44,975 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/data/3fd44f05c/1e0aed9e5bff405eabf4265773357919/FLAGe414c20ba [2021-11-25 17:50:45,230 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/data/3fd44f05c/1e0aed9e5bff405eabf4265773357919 [2021-11-25 17:50:45,241 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 17:50:45,242 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 17:50:45,245 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 17:50:45,245 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 17:50:45,249 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 17:50:45,249 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:50:45" (1/1) ... [2021-11-25 17:50:45,251 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5701ee3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:45, skipping insertion in model container [2021-11-25 17:50:45,251 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:50:45" (1/1) ... [2021-11-25 17:50:45,259 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 17:50:45,317 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 17:50:45,489 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_410007a6-3d4d-43c8-9fca-210aa435a67b/sv-benchmarks/c/systemc/token_ring.10.cil-2.c[671,684] [2021-11-25 17:50:45,618 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:50:45,636 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 17:50:45,658 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_410007a6-3d4d-43c8-9fca-210aa435a67b/sv-benchmarks/c/systemc/token_ring.10.cil-2.c[671,684] [2021-11-25 17:50:45,725 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:50:45,745 INFO L208 MainTranslator]: Completed translation [2021-11-25 17:50:45,746 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:45 WrapperNode [2021-11-25 17:50:45,746 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 17:50:45,747 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 17:50:45,747 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 17:50:45,747 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 17:50:45,755 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:45" (1/1) ... [2021-11-25 17:50:45,777 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:45" (1/1) ... [2021-11-25 17:50:45,824 INFO L137 Inliner]: procedures = 48, calls = 61, calls flagged for inlining = 32, calls inlined = 32, statements flattened = 737 [2021-11-25 17:50:45,824 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 17:50:45,825 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 17:50:45,825 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 17:50:45,826 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 17:50:45,834 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:45" (1/1) ... [2021-11-25 17:50:45,834 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:45" (1/1) ... [2021-11-25 17:50:45,839 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:45" (1/1) ... [2021-11-25 17:50:45,839 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:45" (1/1) ... [2021-11-25 17:50:45,853 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:45" (1/1) ... [2021-11-25 17:50:45,874 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:45" (1/1) ... [2021-11-25 17:50:45,877 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:45" (1/1) ... [2021-11-25 17:50:45,882 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 17:50:45,899 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 17:50:45,899 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 17:50:45,900 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 17:50:45,901 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:45" (1/1) ... [2021-11-25 17:50:45,920 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:50:45,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:50:45,961 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 17:50:45,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 17:50:46,013 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 17:50:46,014 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-25 17:50:46,014 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-25 17:50:46,015 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-25 17:50:46,015 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-25 17:50:46,015 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-25 17:50:46,015 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-25 17:50:46,015 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-25 17:50:46,015 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-25 17:50:46,016 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-25 17:50:46,016 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-25 17:50:46,016 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 17:50:46,016 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-25 17:50:46,016 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-25 17:50:46,016 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 17:50:46,017 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 17:50:46,160 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 17:50:46,176 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 17:50:46,988 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 17:50:47,284 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 17:50:47,284 INFO L301 CfgBuilder]: Removed 13 assume(true) statements. [2021-11-25 17:50:47,287 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:50:47 BoogieIcfgContainer [2021-11-25 17:50:47,288 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 17:50:47,290 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 17:50:47,290 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 17:50:47,293 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 17:50:47,293 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 05:50:45" (1/3) ... [2021-11-25 17:50:47,294 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15076db7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:50:47, skipping insertion in model container [2021-11-25 17:50:47,294 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:50:45" (2/3) ... [2021-11-25 17:50:47,295 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15076db7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:50:47, skipping insertion in model container [2021-11-25 17:50:47,295 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:50:47" (3/3) ... [2021-11-25 17:50:47,296 INFO L111 eAbstractionObserver]: Analyzing ICFG token_ring.10.cil-2.c [2021-11-25 17:50:47,305 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 17:50:47,305 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 17:50:47,354 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 17:50:47,361 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 17:50:47,361 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 17:50:47,394 INFO L276 IsEmpty]: Start isEmpty. Operand has 166 states, 134 states have (on average 1.5522388059701493) internal successors, (208), 136 states have internal predecessors, (208), 24 states have call successors, (24), 6 states have call predecessors, (24), 6 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-25 17:50:47,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 17:50:47,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:47,404 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:47,405 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:47,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:47,410 INFO L85 PathProgramCache]: Analyzing trace with hash -41341396, now seen corresponding path program 1 times [2021-11-25 17:50:47,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:47,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121407166] [2021-11-25 17:50:47,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:47,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:47,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:47,858 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 17:50:47,858 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:47,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121407166] [2021-11-25 17:50:47,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1121407166] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:47,860 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:50:47,860 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 17:50:47,862 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041070585] [2021-11-25 17:50:47,862 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:47,867 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:50:47,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:47,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:50:47,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:47,901 INFO L87 Difference]: Start difference. First operand has 166 states, 134 states have (on average 1.5522388059701493) internal successors, (208), 136 states have internal predecessors, (208), 24 states have call successors, (24), 6 states have call predecessors, (24), 6 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 17:50:48,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:48,448 INFO L93 Difference]: Finished difference Result 482 states and 758 transitions. [2021-11-25 17:50:48,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:50:48,450 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 60 [2021-11-25 17:50:48,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:48,463 INFO L225 Difference]: With dead ends: 482 [2021-11-25 17:50:48,475 INFO L226 Difference]: Without dead ends: 317 [2021-11-25 17:50:48,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:48,498 INFO L933 BasicCegarLoop]: 394 mSDtfsCounter, 446 mSDsluCounter, 385 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 446 SdHoareTripleChecker+Valid, 698 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:48,499 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [446 Valid, 698 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:50:48,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-11-25 17:50:48,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 316. [2021-11-25 17:50:48,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 259 states have (on average 1.5135135135135136) internal successors, (392), 261 states have internal predecessors, (392), 44 states have call successors, (44), 12 states have call predecessors, (44), 12 states have return successors, (44), 43 states have call predecessors, (44), 44 states have call successors, (44) [2021-11-25 17:50:48,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 480 transitions. [2021-11-25 17:50:48,664 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 480 transitions. Word has length 60 [2021-11-25 17:50:48,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:48,665 INFO L470 AbstractCegarLoop]: Abstraction has 316 states and 480 transitions. [2021-11-25 17:50:48,666 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 17:50:48,666 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 480 transitions. [2021-11-25 17:50:48,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 17:50:48,682 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:48,682 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:48,683 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 17:50:48,683 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:48,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:48,687 INFO L85 PathProgramCache]: Analyzing trace with hash -651372697, now seen corresponding path program 1 times [2021-11-25 17:50:48,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:48,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350128647] [2021-11-25 17:50:48,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:48,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:48,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:48,867 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:50:48,867 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:48,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350128647] [2021-11-25 17:50:48,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [350128647] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:50:48,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748303858] [2021-11-25 17:50:48,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:48,869 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:50:48,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:50:48,870 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:50:48,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 17:50:49,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:49,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 852 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 17:50:49,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:50:49,337 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 17:50:49,338 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:50:49,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748303858] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:49,345 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:50:49,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 17:50:49,347 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600431868] [2021-11-25 17:50:49,347 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:49,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:50:49,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:49,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:50:49,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:50:49,352 INFO L87 Difference]: Start difference. First operand 316 states and 480 transitions. Second operand has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 2 states have internal predecessors, (76), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 17:50:49,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:49,528 INFO L93 Difference]: Finished difference Result 931 states and 1439 transitions. [2021-11-25 17:50:49,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:50:49,529 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 2 states have internal predecessors, (76), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 121 [2021-11-25 17:50:49,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:49,542 INFO L225 Difference]: With dead ends: 931 [2021-11-25 17:50:49,542 INFO L226 Difference]: Without dead ends: 620 [2021-11-25 17:50:49,548 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:50:49,550 INFO L933 BasicCegarLoop]: 254 mSDtfsCounter, 223 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 450 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:49,551 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [223 Valid, 450 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:50:49,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 620 states. [2021-11-25 17:50:49,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 620 to 616. [2021-11-25 17:50:49,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 616 states, 509 states have (on average 1.5108055009823183) internal successors, (769), 512 states have internal predecessors, (769), 82 states have call successors, (82), 24 states have call predecessors, (82), 24 states have return successors, (82), 80 states have call predecessors, (82), 82 states have call successors, (82) [2021-11-25 17:50:49,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 616 states to 616 states and 933 transitions. [2021-11-25 17:50:49,621 INFO L78 Accepts]: Start accepts. Automaton has 616 states and 933 transitions. Word has length 121 [2021-11-25 17:50:49,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:49,621 INFO L470 AbstractCegarLoop]: Abstraction has 616 states and 933 transitions. [2021-11-25 17:50:49,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 2 states have internal predecessors, (76), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 17:50:49,622 INFO L276 IsEmpty]: Start isEmpty. Operand 616 states and 933 transitions. [2021-11-25 17:50:49,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 17:50:49,628 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:49,628 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:49,666 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 17:50:49,843 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:50:49,843 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:49,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:49,844 INFO L85 PathProgramCache]: Analyzing trace with hash -322219577, now seen corresponding path program 1 times [2021-11-25 17:50:49,844 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:49,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566049019] [2021-11-25 17:50:49,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:49,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:49,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:49,952 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:50:49,952 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:49,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566049019] [2021-11-25 17:50:49,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1566049019] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:50:49,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [951393029] [2021-11-25 17:50:49,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:49,953 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:50:49,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:50:49,954 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:50:49,973 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 17:50:50,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:50,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 846 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 17:50:50,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:50:50,378 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 17:50:50,378 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:50:50,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [951393029] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:50,379 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:50:50,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 17:50:50,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111544439] [2021-11-25 17:50:50,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:50,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:50:50,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:50,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:50:50,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:50:50,383 INFO L87 Difference]: Start difference. First operand 616 states and 933 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 17:50:50,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:50,565 INFO L93 Difference]: Finished difference Result 1825 states and 2812 transitions. [2021-11-25 17:50:50,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:50:50,566 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 121 [2021-11-25 17:50:50,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:50,578 INFO L225 Difference]: With dead ends: 1825 [2021-11-25 17:50:50,578 INFO L226 Difference]: Without dead ends: 1214 [2021-11-25 17:50:50,583 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:50:50,586 INFO L933 BasicCegarLoop]: 235 mSDtfsCounter, 217 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 431 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:50,588 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [217 Valid, 431 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:50:50,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1214 states. [2021-11-25 17:50:50,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1214 to 1208. [2021-11-25 17:50:50,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1208 states, 1003 states have (on average 1.506480558325025) internal successors, (1511), 1008 states have internal predecessors, (1511), 156 states have call successors, (156), 48 states have call predecessors, (156), 48 states have return successors, (156), 152 states have call predecessors, (156), 156 states have call successors, (156) [2021-11-25 17:50:50,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1208 states to 1208 states and 1823 transitions. [2021-11-25 17:50:50,683 INFO L78 Accepts]: Start accepts. Automaton has 1208 states and 1823 transitions. Word has length 121 [2021-11-25 17:50:50,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:50,685 INFO L470 AbstractCegarLoop]: Abstraction has 1208 states and 1823 transitions. [2021-11-25 17:50:50,685 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 17:50:50,686 INFO L276 IsEmpty]: Start isEmpty. Operand 1208 states and 1823 transitions. [2021-11-25 17:50:50,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 17:50:50,698 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:50,698 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:50,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 17:50:50,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:50:50,911 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:50,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:50,912 INFO L85 PathProgramCache]: Analyzing trace with hash -840100825, now seen corresponding path program 1 times [2021-11-25 17:50:50,912 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:50,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1425648924] [2021-11-25 17:50:50,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:50,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:50,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:51,040 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:50:51,041 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:51,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1425648924] [2021-11-25 17:50:51,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1425648924] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:50:51,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878065934] [2021-11-25 17:50:51,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:51,046 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:50:51,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:50:51,047 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:50:51,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 17:50:51,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:51,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 840 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 17:50:51,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:50:51,462 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 17:50:51,463 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:50:51,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878065934] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:51,463 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:50:51,463 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 17:50:51,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485277125] [2021-11-25 17:50:51,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:51,465 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:50:51,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:51,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:50:51,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:50:51,466 INFO L87 Difference]: Start difference. First operand 1208 states and 1823 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 2 states have internal predecessors, (73), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 17:50:51,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:51,684 INFO L93 Difference]: Finished difference Result 3589 states and 5508 transitions. [2021-11-25 17:50:51,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:50:51,686 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 2 states have internal predecessors, (73), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 121 [2021-11-25 17:50:51,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:51,710 INFO L225 Difference]: With dead ends: 3589 [2021-11-25 17:50:51,710 INFO L226 Difference]: Without dead ends: 2386 [2021-11-25 17:50:51,719 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:50:51,721 INFO L933 BasicCegarLoop]: 252 mSDtfsCounter, 226 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 448 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:51,722 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 448 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:50:51,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2386 states. [2021-11-25 17:50:51,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2386 to 2376. [2021-11-25 17:50:51,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2376 states, 1979 states have (on average 1.5012632642748862) internal successors, (2971), 1988 states have internal predecessors, (2971), 300 states have call successors, (300), 96 states have call predecessors, (300), 96 states have return successors, (300), 292 states have call predecessors, (300), 300 states have call successors, (300) [2021-11-25 17:50:51,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2376 states to 2376 states and 3571 transitions. [2021-11-25 17:50:51,880 INFO L78 Accepts]: Start accepts. Automaton has 2376 states and 3571 transitions. Word has length 121 [2021-11-25 17:50:51,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:51,881 INFO L470 AbstractCegarLoop]: Abstraction has 2376 states and 3571 transitions. [2021-11-25 17:50:51,881 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 2 states have internal predecessors, (73), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 17:50:51,881 INFO L276 IsEmpty]: Start isEmpty. Operand 2376 states and 3571 transitions. [2021-11-25 17:50:51,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 17:50:51,889 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:51,890 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:51,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 17:50:52,115 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:50:52,115 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:52,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:52,116 INFO L85 PathProgramCache]: Analyzing trace with hash -449839673, now seen corresponding path program 1 times [2021-11-25 17:50:52,116 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:52,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655978798] [2021-11-25 17:50:52,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:52,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:52,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:52,218 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:50:52,218 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:52,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655978798] [2021-11-25 17:50:52,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655978798] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:50:52,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062820428] [2021-11-25 17:50:52,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:52,219 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:50:52,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:50:52,220 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:50:52,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 17:50:52,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:52,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 834 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 17:50:52,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:50:52,633 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 17:50:52,633 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:50:52,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1062820428] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:52,634 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:50:52,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 17:50:52,634 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811202948] [2021-11-25 17:50:52,634 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:52,635 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:50:52,635 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:52,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:50:52,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:50:52,636 INFO L87 Difference]: Start difference. First operand 2376 states and 3571 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 17:50:52,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:52,944 INFO L93 Difference]: Finished difference Result 7069 states and 10800 transitions. [2021-11-25 17:50:52,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:50:52,944 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 121 [2021-11-25 17:50:52,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:52,979 INFO L225 Difference]: With dead ends: 7069 [2021-11-25 17:50:52,979 INFO L226 Difference]: Without dead ends: 4698 [2021-11-25 17:50:52,990 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:50:52,993 INFO L933 BasicCegarLoop]: 224 mSDtfsCounter, 211 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:52,994 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 420 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:50:53,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4698 states. [2021-11-25 17:50:53,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4698 to 4680. [2021-11-25 17:50:53,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4680 states, 3907 states have (on average 1.495520859994881) internal successors, (5843), 3924 states have internal predecessors, (5843), 580 states have call successors, (580), 192 states have call predecessors, (580), 192 states have return successors, (580), 564 states have call predecessors, (580), 580 states have call successors, (580) [2021-11-25 17:50:53,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4680 states to 4680 states and 7003 transitions. [2021-11-25 17:50:53,290 INFO L78 Accepts]: Start accepts. Automaton has 4680 states and 7003 transitions. Word has length 121 [2021-11-25 17:50:53,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:53,291 INFO L470 AbstractCegarLoop]: Abstraction has 4680 states and 7003 transitions. [2021-11-25 17:50:53,291 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 17:50:53,292 INFO L276 IsEmpty]: Start isEmpty. Operand 4680 states and 7003 transitions. [2021-11-25 17:50:53,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 17:50:53,306 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:53,306 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:53,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 17:50:53,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:50:53,523 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:53,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:53,524 INFO L85 PathProgramCache]: Analyzing trace with hash -1444214745, now seen corresponding path program 1 times [2021-11-25 17:50:53,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:53,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870159623] [2021-11-25 17:50:53,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:53,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:53,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:53,611 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-25 17:50:53,611 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:53,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870159623] [2021-11-25 17:50:53,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870159623] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:50:53,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1704246314] [2021-11-25 17:50:53,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:53,612 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:50:53,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:50:53,613 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:50:53,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 17:50:53,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:53,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 828 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 17:50:53,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:50:53,983 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 17:50:53,984 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:50:53,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1704246314] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:53,984 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:50:53,984 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2021-11-25 17:50:53,985 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003566742] [2021-11-25 17:50:53,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:53,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:50:53,986 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:53,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:50:53,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:53,987 INFO L87 Difference]: Start difference. First operand 4680 states and 7003 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 17:50:54,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:54,496 INFO L93 Difference]: Finished difference Result 13933 states and 21184 transitions. [2021-11-25 17:50:54,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:50:54,497 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 121 [2021-11-25 17:50:54,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:54,570 INFO L225 Difference]: With dead ends: 13933 [2021-11-25 17:50:54,571 INFO L226 Difference]: Without dead ends: 9258 [2021-11-25 17:50:54,587 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 17:50:54,589 INFO L933 BasicCegarLoop]: 224 mSDtfsCounter, 205 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:54,589 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 420 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:50:54,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9258 states. [2021-11-25 17:50:55,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9258 to 9224. [2021-11-25 17:50:55,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9224 states, 7715 states have (on average 1.4894361633182114) internal successors, (11491), 7748 states have internal predecessors, (11491), 1124 states have call successors, (1124), 384 states have call predecessors, (1124), 384 states have return successors, (1124), 1092 states have call predecessors, (1124), 1124 states have call successors, (1124) [2021-11-25 17:50:55,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9224 states to 9224 states and 13739 transitions. [2021-11-25 17:50:55,143 INFO L78 Accepts]: Start accepts. Automaton has 9224 states and 13739 transitions. Word has length 121 [2021-11-25 17:50:55,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:55,144 INFO L470 AbstractCegarLoop]: Abstraction has 9224 states and 13739 transitions. [2021-11-25 17:50:55,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 17:50:55,144 INFO L276 IsEmpty]: Start isEmpty. Operand 9224 states and 13739 transitions. [2021-11-25 17:50:55,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 17:50:55,176 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:55,177 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:55,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 17:50:55,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_410007a6-3d4d-43c8-9fca-210aa435a67b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:50:55,391 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:55,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:55,392 INFO L85 PathProgramCache]: Analyzing trace with hash 819288711, now seen corresponding path program 1 times [2021-11-25 17:50:55,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:55,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637669982] [2021-11-25 17:50:55,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:55,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:55,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:55,528 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 17:50:55,529 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:55,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637669982] [2021-11-25 17:50:55,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637669982] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:55,530 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:50:55,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:50:55,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281666551] [2021-11-25 17:50:55,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:55,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:50:55,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:55,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:50:55,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:50:55,532 INFO L87 Difference]: Start difference. First operand 9224 states and 13739 transitions. Second operand has 6 states, 6 states have (on average 11.666666666666666) internal successors, (70), 6 states have internal predecessors, (70), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 17:50:56,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:50:56,764 INFO L93 Difference]: Finished difference Result 29580 states and 44366 transitions. [2021-11-25 17:50:56,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:50:56,764 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.666666666666666) internal successors, (70), 6 states have internal predecessors, (70), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 121 [2021-11-25 17:50:56,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:50:56,923 INFO L225 Difference]: With dead ends: 29580 [2021-11-25 17:50:56,924 INFO L226 Difference]: Without dead ends: 20362 [2021-11-25 17:50:56,961 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:50:56,962 INFO L933 BasicCegarLoop]: 232 mSDtfsCounter, 775 mSDsluCounter, 448 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 794 SdHoareTripleChecker+Valid, 606 SdHoareTripleChecker+Invalid, 394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:50:56,963 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [794 Valid, 606 Invalid, 394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:50:56,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20362 states. [2021-11-25 17:50:58,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20362 to 18056. [2021-11-25 17:50:58,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18056 states, 15107 states have (on average 1.482954921559542) internal successors, (22403), 15172 states have internal predecessors, (22403), 2180 states have call successors, (2180), 768 states have call predecessors, (2180), 768 states have return successors, (2180), 2116 states have call predecessors, (2180), 2180 states have call successors, (2180) [2021-11-25 17:50:58,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18056 states to 18056 states and 26763 transitions. [2021-11-25 17:50:58,183 INFO L78 Accepts]: Start accepts. Automaton has 18056 states and 26763 transitions. Word has length 121 [2021-11-25 17:50:58,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:50:58,184 INFO L470 AbstractCegarLoop]: Abstraction has 18056 states and 26763 transitions. [2021-11-25 17:50:58,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.666666666666666) internal successors, (70), 6 states have internal predecessors, (70), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 17:50:58,185 INFO L276 IsEmpty]: Start isEmpty. Operand 18056 states and 26763 transitions. [2021-11-25 17:50:58,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-25 17:50:58,233 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:50:58,233 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:50:58,234 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 17:50:58,234 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:50:58,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:50:58,244 INFO L85 PathProgramCache]: Analyzing trace with hash 1884186193, now seen corresponding path program 1 times [2021-11-25 17:50:58,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:50:58,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016985814] [2021-11-25 17:50:58,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:50:58,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:50:58,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:50:58,482 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 17:50:58,482 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:50:58,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016985814] [2021-11-25 17:50:58,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016985814] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:50:58,483 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:50:58,483 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:50:58,483 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944262889] [2021-11-25 17:50:58,483 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:50:58,484 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:50:58,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:50:58,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:50:58,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:50:58,485 INFO L87 Difference]: Start difference. First operand 18056 states and 26763 transitions. Second operand has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 17:51:00,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:00,154 INFO L93 Difference]: Finished difference Result 46732 states and 69741 transitions. [2021-11-25 17:51:00,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:51:00,155 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 122 [2021-11-25 17:51:00,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:00,295 INFO L225 Difference]: With dead ends: 46732 [2021-11-25 17:51:00,296 INFO L226 Difference]: Without dead ends: 28682 [2021-11-25 17:51:00,352 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:51:00,353 INFO L933 BasicCegarLoop]: 219 mSDtfsCounter, 711 mSDsluCounter, 618 mSDsCounter, 0 mSdLazyCounter, 330 mSolverCounterSat, 142 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 717 SdHoareTripleChecker+Valid, 737 SdHoareTripleChecker+Invalid, 472 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:00,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [717 Valid, 737 Invalid, 472 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [142 Valid, 330 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:51:00,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28682 states. [2021-11-25 17:51:01,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28682 to 26824. [2021-11-25 17:51:01,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26824 states, 22435 states have (on average 1.4778248272788055) internal successors, (33155), 22532 states have internal predecessors, (33155), 3236 states have call successors, (3236), 1152 states have call predecessors, (3236), 1152 states have return successors, (3236), 3140 states have call predecessors, (3236), 3236 states have call successors, (3236) [2021-11-25 17:51:02,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26824 states to 26824 states and 39627 transitions. [2021-11-25 17:51:02,091 INFO L78 Accepts]: Start accepts. Automaton has 26824 states and 39627 transitions. Word has length 122 [2021-11-25 17:51:02,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:51:02,092 INFO L470 AbstractCegarLoop]: Abstraction has 26824 states and 39627 transitions. [2021-11-25 17:51:02,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 17:51:02,093 INFO L276 IsEmpty]: Start isEmpty. Operand 26824 states and 39627 transitions. [2021-11-25 17:51:02,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-25 17:51:02,153 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:02,153 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:02,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 17:51:02,154 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:02,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:02,154 INFO L85 PathProgramCache]: Analyzing trace with hash -577905461, now seen corresponding path program 1 times [2021-11-25 17:51:02,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:02,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903336714] [2021-11-25 17:51:02,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:02,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:02,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:02,267 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 17:51:02,268 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:02,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903336714] [2021-11-25 17:51:02,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903336714] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:51:02,268 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:51:02,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:51:02,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139852714] [2021-11-25 17:51:02,269 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:51:02,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:51:02,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:02,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:51:02,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:51:02,270 INFO L87 Difference]: Start difference. First operand 26824 states and 39627 transitions. Second operand has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 17:51:05,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:05,705 INFO L93 Difference]: Finished difference Result 93388 states and 138222 transitions. [2021-11-25 17:51:05,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:51:05,706 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 123 [2021-11-25 17:51:05,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:06,031 INFO L225 Difference]: With dead ends: 93388 [2021-11-25 17:51:06,031 INFO L226 Difference]: Without dead ends: 66570 [2021-11-25 17:51:06,103 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:51:06,106 INFO L933 BasicCegarLoop]: 227 mSDtfsCounter, 953 mSDsluCounter, 473 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 972 SdHoareTripleChecker+Valid, 621 SdHoareTripleChecker+Invalid, 399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:06,106 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [972 Valid, 621 Invalid, 399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:51:06,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66570 states. [2021-11-25 17:51:08,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66570 to 52488. [2021-11-25 17:51:09,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52488 states, 43907 states have (on average 1.4708133099505774) internal successors, (64579), 44100 states have internal predecessors, (64579), 6276 states have call successors, (6276), 2304 states have call predecessors, (6276), 2304 states have return successors, (6276), 6084 states have call predecessors, (6276), 6276 states have call successors, (6276) [2021-11-25 17:51:09,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52488 states to 52488 states and 77131 transitions. [2021-11-25 17:51:09,319 INFO L78 Accepts]: Start accepts. Automaton has 52488 states and 77131 transitions. Word has length 123 [2021-11-25 17:51:09,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:51:09,320 INFO L470 AbstractCegarLoop]: Abstraction has 52488 states and 77131 transitions. [2021-11-25 17:51:09,320 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 17:51:09,320 INFO L276 IsEmpty]: Start isEmpty. Operand 52488 states and 77131 transitions. [2021-11-25 17:51:09,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-25 17:51:09,669 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:09,670 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:09,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 17:51:09,670 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:09,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:09,671 INFO L85 PathProgramCache]: Analyzing trace with hash -1295166311, now seen corresponding path program 1 times [2021-11-25 17:51:09,671 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:09,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630011814] [2021-11-25 17:51:09,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:09,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:09,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:09,796 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 17:51:09,796 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:09,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630011814] [2021-11-25 17:51:09,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630011814] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:51:09,797 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:51:09,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:51:09,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84321537] [2021-11-25 17:51:09,797 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:51:09,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:51:09,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:09,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:51:09,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:51:09,799 INFO L87 Difference]: Start difference. First operand 52488 states and 77131 transitions. Second operand has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 states have internal predecessors, (73), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 17:51:14,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:14,753 INFO L93 Difference]: Finished difference Result 174860 states and 258382 transitions. [2021-11-25 17:51:14,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:51:14,754 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 states have internal predecessors, (73), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 124 [2021-11-25 17:51:14,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:15,274 INFO L225 Difference]: With dead ends: 174860 [2021-11-25 17:51:15,274 INFO L226 Difference]: Without dead ends: 122378 [2021-11-25 17:51:15,447 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:51:15,447 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 824 mSDsluCounter, 568 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 146 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 843 SdHoareTripleChecker+Valid, 682 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 146 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:15,449 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [843 Valid, 682 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [146 Valid, 321 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:51:15,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122378 states. [2021-11-25 17:51:20,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122378 to 102664. [2021-11-25 17:51:21,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102664 states, 85891 states have (on average 1.4634711436588235) internal successors, (125699), 86276 states have internal predecessors, (125699), 12164 states have call successors, (12164), 4608 states have call predecessors, (12164), 4608 states have return successors, (12164), 11780 states have call predecessors, (12164), 12164 states have call successors, (12164) [2021-11-25 17:51:21,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102664 states to 102664 states and 150027 transitions. [2021-11-25 17:51:21,554 INFO L78 Accepts]: Start accepts. Automaton has 102664 states and 150027 transitions. Word has length 124 [2021-11-25 17:51:21,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:51:21,555 INFO L470 AbstractCegarLoop]: Abstraction has 102664 states and 150027 transitions. [2021-11-25 17:51:21,555 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 states have internal predecessors, (73), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 17:51:21,555 INFO L276 IsEmpty]: Start isEmpty. Operand 102664 states and 150027 transitions. [2021-11-25 17:51:21,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-25 17:51:21,706 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:51:21,707 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:51:21,707 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 17:51:21,708 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:51:21,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:51:21,708 INFO L85 PathProgramCache]: Analyzing trace with hash -1856139129, now seen corresponding path program 1 times [2021-11-25 17:51:21,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:51:21,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807884095] [2021-11-25 17:51:21,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:51:21,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:51:22,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:51:22,496 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 17:51:22,497 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:51:22,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807884095] [2021-11-25 17:51:22,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [807884095] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:51:22,497 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:51:22,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:51:22,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350575262] [2021-11-25 17:51:22,498 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:51:22,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:51:22,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:51:22,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:51:22,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:51:22,500 INFO L87 Difference]: Start difference. First operand 102664 states and 150027 transitions. Second operand has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 17:51:30,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:51:30,191 INFO L93 Difference]: Finished difference Result 272140 states and 400141 transitions. [2021-11-25 17:51:30,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:51:30,192 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 125 [2021-11-25 17:51:30,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:51:31,225 INFO L225 Difference]: With dead ends: 272140 [2021-11-25 17:51:31,226 INFO L226 Difference]: Without dead ends: 169482 [2021-11-25 17:51:31,428 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:51:31,429 INFO L933 BasicCegarLoop]: 219 mSDtfsCounter, 772 mSDsluCounter, 487 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 142 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 778 SdHoareTripleChecker+Valid, 629 SdHoareTripleChecker+Invalid, 400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:51:31,429 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [778 Valid, 629 Invalid, 400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [142 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:51:31,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169482 states.