./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem15_label43.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem15_label43.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl --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 443b39ef03d047933d04d3c4124d0553fdbdc2364608b268fc568d4113c9c65f --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:14:11,818 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:14:11,820 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:14:11,852 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:14:11,853 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:14:11,855 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:14:11,857 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:14:11,859 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:14:11,862 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:14:11,863 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:14:11,865 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:14:11,866 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:14:11,867 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:14:11,868 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:14:11,870 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:14:11,872 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:14:11,873 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:14:11,874 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:14:11,878 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:14:11,883 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:14:11,888 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:14:11,890 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:14:11,893 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:14:11,895 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:14:11,901 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:14:11,902 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:14:11,902 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:14:11,910 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:14:11,911 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:14:11,913 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:14:11,914 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:14:11,915 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:14:11,917 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:14:11,919 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:14:11,920 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:14:11,921 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:14:11,922 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:14:11,922 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:14:11,922 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:14:11,923 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:14:11,924 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:14:11,925 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:14:11,982 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:14:11,983 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:14:11,984 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:14:11,984 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:14:11,985 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:14:11,985 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:14:11,986 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:14:11,986 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:14:11,986 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:14:11,986 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:14:11,988 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:14:11,988 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:14:11,988 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:14:11,989 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:14:11,989 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:14:11,989 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:14:11,989 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:14:11,990 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:14:11,990 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:14:11,991 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:14:11,991 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:14:11,991 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:14:11,992 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:14:11,992 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:14:11,992 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:14:11,992 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:14:11,994 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:14:11,994 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:14:11,995 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:14:11,995 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:14:11,995 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:14:11,996 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:14:11,996 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:14:11,996 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:14:11,997 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:14:11,997 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:14:11,997 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:14:11,997 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:14:11,998 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:14:11,998 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:14:11,998 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:14:11,998 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_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 443b39ef03d047933d04d3c4124d0553fdbdc2364608b268fc568d4113c9c65f [2021-11-23 17:14:12,312 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:14:12,336 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:14:12,339 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:14:12,340 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:14:12,341 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:14:12,342 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem15_label43.c [2021-11-23 17:14:12,418 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/data/dea56d4e4/982e4400dbf24030aa9741e6dda37468/FLAGa6d79c002 [2021-11-23 17:14:13,268 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:14:13,269 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/sv-benchmarks/c/eca-rers2012/Problem15_label43.c [2021-11-23 17:14:13,297 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/data/dea56d4e4/982e4400dbf24030aa9741e6dda37468/FLAGa6d79c002 [2021-11-23 17:14:13,432 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/data/dea56d4e4/982e4400dbf24030aa9741e6dda37468 [2021-11-23 17:14:13,436 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:14:13,439 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:14:13,443 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:14:13,443 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:14:13,447 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:14:13,448 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:14:13" (1/1) ... [2021-11-23 17:14:13,450 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@24e25ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:13, skipping insertion in model container [2021-11-23 17:14:13,450 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:14:13" (1/1) ... [2021-11-23 17:14:13,461 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:14:13,562 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:14:13,925 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_23e7be4f-4563-476e-b255-5f3ce8fddc57/sv-benchmarks/c/eca-rers2012/Problem15_label43.c[7052,7065] [2021-11-23 17:14:14,402 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:14:14,414 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:14:14,460 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_23e7be4f-4563-476e-b255-5f3ce8fddc57/sv-benchmarks/c/eca-rers2012/Problem15_label43.c[7052,7065] [2021-11-23 17:14:14,752 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:14:14,771 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:14:14,772 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:14 WrapperNode [2021-11-23 17:14:14,772 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:14:14,773 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:14:14,774 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:14:14,774 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:14:14,782 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:14" (1/1) ... [2021-11-23 17:14:14,844 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:14" (1/1) ... [2021-11-23 17:14:15,144 INFO L137 Inliner]: procedures = 15, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 1758 [2021-11-23 17:14:15,144 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:14:15,162 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:14:15,162 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:14:15,162 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:14:15,172 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:14" (1/1) ... [2021-11-23 17:14:15,173 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:14" (1/1) ... [2021-11-23 17:14:15,234 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:14" (1/1) ... [2021-11-23 17:14:15,235 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:14" (1/1) ... [2021-11-23 17:14:15,441 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:14" (1/1) ... [2021-11-23 17:14:15,483 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:14" (1/1) ... [2021-11-23 17:14:15,508 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:14" (1/1) ... [2021-11-23 17:14:15,533 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:14:15,535 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:14:15,535 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:14:15,535 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:14:15,536 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:14" (1/1) ... [2021-11-23 17:14:15,544 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:14:15,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:14:15,576 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:14:15,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:14:15,625 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:14:15,625 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:14:15,625 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:14:15,625 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:14:15,693 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:14:15,695 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:14:18,578 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:14:18,636 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 17:14:18,642 INFO L158 Benchmark]: Toolchain (without parser) took 5200.85ms. Allocated memory was 123.7MB in the beginning and 318.8MB in the end (delta: 195.0MB). Free memory was 89.4MB in the beginning and 227.6MB in the end (delta: -138.2MB). Peak memory consumption was 144.8MB. Max. memory is 16.1GB. [2021-11-23 17:14:18,643 INFO L158 Benchmark]: CDTParser took 0.16ms. Allocated memory is still 123.7MB. Free memory is still 79.4MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:14:18,645 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1329.29ms. Allocated memory was 123.7MB in the beginning and 176.2MB in the end (delta: 52.4MB). Free memory was 89.3MB in the beginning and 117.6MB in the end (delta: -28.4MB). Peak memory consumption was 41.2MB. Max. memory is 16.1GB. [2021-11-23 17:14:18,647 INFO L158 Benchmark]: Boogie Procedure Inliner took 372.42ms. Allocated memory is still 176.2MB. Free memory was 117.6MB in the beginning and 117.9MB in the end (delta: -246.5kB). Peak memory consumption was 43.5MB. Max. memory is 16.1GB. [2021-11-23 17:14:18,648 INFO L158 Benchmark]: Boogie Preprocessor took 371.63ms. Allocated memory was 176.2MB in the beginning and 318.8MB in the end (delta: 142.6MB). Free memory was 117.9MB in the beginning and 253.6MB in the end (delta: -135.7MB). Peak memory consumption was 24.1MB. Max. memory is 16.1GB. [2021-11-23 17:14:18,649 INFO L158 Benchmark]: RCFGBuilder took 3104.06ms. Allocated memory is still 318.8MB. Free memory was 253.6MB in the beginning and 227.6MB in the end (delta: 26.0MB). Peak memory consumption was 113.5MB. Max. memory is 16.1GB. [2021-11-23 17:14:18,658 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16ms. Allocated memory is still 123.7MB. Free memory is still 79.4MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1329.29ms. Allocated memory was 123.7MB in the beginning and 176.2MB in the end (delta: 52.4MB). Free memory was 89.3MB in the beginning and 117.6MB in the end (delta: -28.4MB). Peak memory consumption was 41.2MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 372.42ms. Allocated memory is still 176.2MB. Free memory was 117.6MB in the beginning and 117.9MB in the end (delta: -246.5kB). Peak memory consumption was 43.5MB. Max. memory is 16.1GB. * Boogie Preprocessor took 371.63ms. Allocated memory was 176.2MB in the beginning and 318.8MB in the end (delta: 142.6MB). Free memory was 117.9MB in the beginning and 253.6MB in the end (delta: -135.7MB). Peak memory consumption was 24.1MB. Max. memory is 16.1GB. * RCFGBuilder took 3104.06ms. Allocated memory is still 318.8MB. Free memory was 253.6MB in the beginning and 227.6MB in the end (delta: 26.0MB). Peak memory consumption was 113.5MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 17:14:18,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem15_label43.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl --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 443b39ef03d047933d04d3c4124d0553fdbdc2364608b268fc568d4113c9c65f --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:14:21,200 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:14:21,204 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:14:21,256 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:14:21,256 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:14:21,258 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:14:21,260 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:14:21,262 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:14:21,270 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:14:21,273 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:14:21,275 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:14:21,278 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:14:21,279 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:14:21,291 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:14:21,293 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:14:21,296 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:14:21,298 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:14:21,300 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:14:21,304 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:14:21,310 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:14:21,315 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:14:21,317 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:14:21,319 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:14:21,322 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:14:21,326 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:14:21,329 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:14:21,329 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:14:21,331 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:14:21,332 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:14:21,333 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:14:21,333 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:14:21,334 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:14:21,336 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:14:21,337 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:14:21,339 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:14:21,339 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:14:21,341 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:14:21,341 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:14:21,341 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:14:21,343 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:14:21,344 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:14:21,345 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:14:21,399 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:14:21,399 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:14:21,400 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:14:21,400 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:14:21,401 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:14:21,401 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:14:21,401 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:14:21,402 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:14:21,402 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:14:21,402 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:14:21,403 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:14:21,403 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:14:21,405 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:14:21,405 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:14:21,406 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:14:21,406 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:14:21,406 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:14:21,406 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:14:21,406 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:14:21,407 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:14:21,407 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:14:21,407 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:14:21,407 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:14:21,408 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:14:21,408 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:14:21,408 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:14:21,408 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:14:21,408 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:14:21,409 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:14:21,409 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:14:21,409 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:14:21,409 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:14:21,410 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:14:21,410 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:14:21,410 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:21,410 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:14:21,411 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:14:21,411 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:14:21,411 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 443b39ef03d047933d04d3c4124d0553fdbdc2364608b268fc568d4113c9c65f [2021-11-23 17:14:21,835 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:14:21,866 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:14:21,868 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:14:21,870 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:14:21,870 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:14:21,872 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem15_label43.c [2021-11-23 17:14:21,954 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/data/170d8355e/ab8c911cdc6f465d86ecf5c5bacaa71d/FLAG4f840d42e [2021-11-23 17:14:22,853 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:14:22,855 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/sv-benchmarks/c/eca-rers2012/Problem15_label43.c [2021-11-23 17:14:22,884 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/data/170d8355e/ab8c911cdc6f465d86ecf5c5bacaa71d/FLAG4f840d42e [2021-11-23 17:14:22,979 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/data/170d8355e/ab8c911cdc6f465d86ecf5c5bacaa71d [2021-11-23 17:14:22,982 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:14:22,983 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:14:22,985 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:14:22,985 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:14:22,989 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:14:22,991 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:14:22" (1/1) ... [2021-11-23 17:14:22,992 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d14f1b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:22, skipping insertion in model container [2021-11-23 17:14:22,993 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:14:22" (1/1) ... [2021-11-23 17:14:23,001 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:14:23,124 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:14:23,467 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_23e7be4f-4563-476e-b255-5f3ce8fddc57/sv-benchmarks/c/eca-rers2012/Problem15_label43.c[7052,7065] [2021-11-23 17:14:24,089 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:14:24,109 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:14:24,159 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_23e7be4f-4563-476e-b255-5f3ce8fddc57/sv-benchmarks/c/eca-rers2012/Problem15_label43.c[7052,7065] [2021-11-23 17:14:24,420 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:14:24,438 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:14:24,439 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:24 WrapperNode [2021-11-23 17:14:24,439 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:14:24,440 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:14:24,440 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:14:24,440 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:14:24,448 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:24" (1/1) ... [2021-11-23 17:14:24,499 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:24" (1/1) ... [2021-11-23 17:14:24,614 INFO L137 Inliner]: procedures = 15, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 1755 [2021-11-23 17:14:24,614 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:14:24,615 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:14:24,615 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:14:24,615 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:14:24,625 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:24" (1/1) ... [2021-11-23 17:14:24,625 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:24" (1/1) ... [2021-11-23 17:14:24,637 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:24" (1/1) ... [2021-11-23 17:14:24,638 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:24" (1/1) ... [2021-11-23 17:14:24,693 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:24" (1/1) ... [2021-11-23 17:14:24,715 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:24" (1/1) ... [2021-11-23 17:14:24,726 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:24" (1/1) ... [2021-11-23 17:14:24,741 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:14:24,743 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:14:24,743 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:14:24,743 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:14:24,744 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:24" (1/1) ... [2021-11-23 17:14:24,752 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:14:24,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:14:24,777 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:14:24,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:14:24,832 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:14:24,832 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:14:24,832 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:14:24,833 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:14:24,906 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:14:24,908 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:14:42,915 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:14:42,931 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:14:42,932 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 17:14:42,935 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:14:42 BoogieIcfgContainer [2021-11-23 17:14:42,935 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:14:42,937 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:14:42,937 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:14:42,940 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:14:42,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:14:22" (1/3) ... [2021-11-23 17:14:42,941 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@161985e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:14:42, skipping insertion in model container [2021-11-23 17:14:42,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:24" (2/3) ... [2021-11-23 17:14:42,942 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@161985e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:14:42, skipping insertion in model container [2021-11-23 17:14:42,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:14:42" (3/3) ... [2021-11-23 17:14:42,944 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem15_label43.c [2021-11-23 17:14:42,949 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:14:42,949 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:14:42,998 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:14:43,005 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 [2021-11-23 17:14:43,006 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:14:43,040 INFO L276 IsEmpty]: Start isEmpty. Operand has 424 states, 422 states have (on average 1.7772511848341233) internal successors, (750), 423 states have internal predecessors, (750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:14:43,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 17:14:43,050 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:43,050 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] [2021-11-23 17:14:43,051 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:43,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:43,057 INFO L85 PathProgramCache]: Analyzing trace with hash -2074400678, now seen corresponding path program 1 times [2021-11-23 17:14:43,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:43,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2024075994] [2021-11-23 17:14:43,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:43,073 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:43,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:43,080 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:43,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:14:43,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:43,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:14:43,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:43,642 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:43,642 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:43,643 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:43,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2024075994] [2021-11-23 17:14:43,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2024075994] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:43,644 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:14:43,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:14:43,646 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024426218] [2021-11-23 17:14:43,647 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:43,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:14:43,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:43,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:14:43,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:14:43,683 INFO L87 Difference]: Start difference. First operand has 424 states, 422 states have (on average 1.7772511848341233) internal successors, (750), 423 states have internal predecessors, (750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:06,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:06,745 INFO L93 Difference]: Finished difference Result 1153 states and 2105 transitions. [2021-11-23 17:15:06,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:06,749 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-23 17:15:06,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:06,773 INFO L225 Difference]: With dead ends: 1153 [2021-11-23 17:15:06,773 INFO L226 Difference]: Without dead ends: 664 [2021-11-23 17:15:06,780 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:06,784 INFO L933 BasicCegarLoop]: 334 mSDtfsCounter, 262 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 991 mSolverCounterSat, 239 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 1230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 239 IncrementalHoareTripleChecker+Valid, 991 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:06,786 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [262 Valid, 383 Invalid, 1230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [239 Valid, 991 Invalid, 0 Unknown, 0 Unchecked, 22.9s Time] [2021-11-23 17:15:06,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 664 states. [2021-11-23 17:15:06,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 664 to 662. [2021-11-23 17:15:06,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 662 states, 661 states have (on average 1.4826021180030258) internal successors, (980), 661 states have internal predecessors, (980), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:06,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 662 states to 662 states and 980 transitions. [2021-11-23 17:15:06,878 INFO L78 Accepts]: Start accepts. Automaton has 662 states and 980 transitions. Word has length 58 [2021-11-23 17:15:06,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:06,879 INFO L470 AbstractCegarLoop]: Abstraction has 662 states and 980 transitions. [2021-11-23 17:15:06,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:06,880 INFO L276 IsEmpty]: Start isEmpty. Operand 662 states and 980 transitions. [2021-11-23 17:15:06,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-23 17:15:06,886 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:06,887 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, 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] [2021-11-23 17:15:06,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:07,102 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:07,103 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:07,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:07,104 INFO L85 PathProgramCache]: Analyzing trace with hash -1658563243, now seen corresponding path program 1 times [2021-11-23 17:15:07,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:07,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [28763350] [2021-11-23 17:15:07,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:07,107 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:07,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:07,110 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:07,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:15:07,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:07,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:15:07,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:07,897 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:07,897 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:07,897 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:07,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [28763350] [2021-11-23 17:15:07,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [28763350] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:07,898 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:07,898 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:15:07,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293885196] [2021-11-23 17:15:07,899 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:07,901 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:07,901 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:07,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:07,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:07,908 INFO L87 Difference]: Start difference. First operand 662 states and 980 transitions. Second operand has 3 states, 3 states have (on average 41.0) internal successors, (123), 2 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:30,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:30,946 INFO L93 Difference]: Finished difference Result 1927 states and 2854 transitions. [2021-11-23 17:15:30,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:30,947 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 41.0) internal successors, (123), 2 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2021-11-23 17:15:30,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:30,958 INFO L225 Difference]: With dead ends: 1927 [2021-11-23 17:15:30,958 INFO L226 Difference]: Without dead ends: 1267 [2021-11-23 17:15:30,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:30,964 INFO L933 BasicCegarLoop]: 279 mSDtfsCounter, 261 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 839 mSolverCounterSat, 285 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 1124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 285 IncrementalHoareTripleChecker+Valid, 839 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:30,965 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [261 Valid, 318 Invalid, 1124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [285 Valid, 839 Invalid, 0 Unknown, 0 Unchecked, 23.0s Time] [2021-11-23 17:15:30,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1267 states. [2021-11-23 17:15:31,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1267 to 1265. [2021-11-23 17:15:31,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1265 states, 1264 states have (on average 1.3045886075949367) internal successors, (1649), 1264 states have internal predecessors, (1649), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:31,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1265 states to 1265 states and 1649 transitions. [2021-11-23 17:15:31,036 INFO L78 Accepts]: Start accepts. Automaton has 1265 states and 1649 transitions. Word has length 123 [2021-11-23 17:15:31,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:31,037 INFO L470 AbstractCegarLoop]: Abstraction has 1265 states and 1649 transitions. [2021-11-23 17:15:31,037 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 41.0) internal successors, (123), 2 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:31,037 INFO L276 IsEmpty]: Start isEmpty. Operand 1265 states and 1649 transitions. [2021-11-23 17:15:31,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2021-11-23 17:15:31,052 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:31,053 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 17:15:31,066 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-23 17:15:31,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:31,266 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:31,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:31,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1565228233, now seen corresponding path program 1 times [2021-11-23 17:15:31,269 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:31,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [920075180] [2021-11-23 17:15:31,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:31,270 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:31,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:31,272 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:31,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:15:31,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:31,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:15:31,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:34,543 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 130 proven. 32 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:15:34,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:37,335 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 130 proven. 32 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:15:37,335 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:37,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [920075180] [2021-11-23 17:15:37,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [920075180] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:37,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1122133091] [2021-11-23 17:15:37,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:37,337 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:37,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:37,365 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:37,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-11-23 17:15:37,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:37,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:37,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:40,434 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 177 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:15:40,434 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:40,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1122133091] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:40,435 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:15:40,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3] total 11 [2021-11-23 17:15:40,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436610062] [2021-11-23 17:15:40,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:40,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:15:40,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:40,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:15:40,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:15:40,438 INFO L87 Difference]: Start difference. First operand 1265 states and 1649 transitions. Second operand has 7 states, 7 states have (on average 31.0) internal successors, (217), 7 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:05,457 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.47s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:16:18,908 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.56s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:16:26,408 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.28s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:16:30,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:30,571 INFO L93 Difference]: Finished difference Result 1976 states and 2648 transitions. [2021-11-23 17:16:30,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:16:30,588 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 31.0) internal successors, (217), 7 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 224 [2021-11-23 17:16:30,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:30,600 INFO L225 Difference]: With dead ends: 1976 [2021-11-23 17:16:30,601 INFO L226 Difference]: Without dead ends: 1974 [2021-11-23 17:16:30,602 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 669 GetRequests, 660 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:16:30,603 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 1410 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 1119 mSolverCounterSat, 606 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 45.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1410 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 1725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 606 IncrementalHoareTripleChecker+Valid, 1119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 50.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:30,604 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1410 Valid, 102 Invalid, 1725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [606 Valid, 1119 Invalid, 0 Unknown, 0 Unchecked, 50.0s Time] [2021-11-23 17:16:30,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1974 states. [2021-11-23 17:16:30,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1974 to 1574. [2021-11-23 17:16:30,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1574 states, 1573 states have (on average 1.3935155753337571) internal successors, (2192), 1573 states have internal predecessors, (2192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:30,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1574 states to 1574 states and 2192 transitions. [2021-11-23 17:16:30,650 INFO L78 Accepts]: Start accepts. Automaton has 1574 states and 2192 transitions. Word has length 224 [2021-11-23 17:16:30,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:30,652 INFO L470 AbstractCegarLoop]: Abstraction has 1574 states and 2192 transitions. [2021-11-23 17:16:30,652 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 31.0) internal successors, (217), 7 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:30,652 INFO L276 IsEmpty]: Start isEmpty. Operand 1574 states and 2192 transitions. [2021-11-23 17:16:30,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2021-11-23 17:16:30,657 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:30,658 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 17:16:30,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:30,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:31,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:31,070 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:31,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:31,071 INFO L85 PathProgramCache]: Analyzing trace with hash 41722983, now seen corresponding path program 1 times [2021-11-23 17:16:31,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:31,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [857586014] [2021-11-23 17:16:31,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:31,073 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:31,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:31,077 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:31,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:16:31,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:31,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:16:31,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:33,525 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 146 proven. 32 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:16:33,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:35,954 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 146 proven. 32 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:16:35,954 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:35,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [857586014] [2021-11-23 17:16:35,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [857586014] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:35,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [495638909] [2021-11-23 17:16:35,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:35,955 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:35,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:16:35,956 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:16:35,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-23 17:16:36,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:36,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:16:36,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:36,563 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 111 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 17:16:36,564 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:36,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [495638909] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:36,564 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:16:36,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 17:16:36,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125838242] [2021-11-23 17:16:36,565 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:36,565 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:16:36,566 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:36,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:16:36,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:36,567 INFO L87 Difference]: Start difference. First operand 1574 states and 2192 transitions. Second operand has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 3 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:42,540 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:17:02,386 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:17:04,115 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.10s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:17:05,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:05,113 INFO L93 Difference]: Finished difference Result 3447 states and 5139 transitions. [2021-11-23 17:17:05,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:17:05,115 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 3 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 268 [2021-11-23 17:17:05,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:05,133 INFO L225 Difference]: With dead ends: 3447 [2021-11-23 17:17:05,133 INFO L226 Difference]: Without dead ends: 2475 [2021-11-23 17:17:05,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 801 GetRequests, 796 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:17:05,137 INFO L933 BasicCegarLoop]: 474 mSDtfsCounter, 349 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 999 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 25.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 349 SdHoareTripleChecker+Valid, 494 SdHoareTripleChecker+Invalid, 1127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 999 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 28.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:05,138 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [349 Valid, 494 Invalid, 1127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 999 Invalid, 0 Unknown, 0 Unchecked, 28.5s Time] [2021-11-23 17:17:05,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2475 states. [2021-11-23 17:17:05,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2475 to 2169. [2021-11-23 17:17:05,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2169 states, 2168 states have (on average 1.3874538745387455) internal successors, (3008), 2168 states have internal predecessors, (3008), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:05,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2169 states to 2169 states and 3008 transitions. [2021-11-23 17:17:05,203 INFO L78 Accepts]: Start accepts. Automaton has 2169 states and 3008 transitions. Word has length 268 [2021-11-23 17:17:05,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:05,204 INFO L470 AbstractCegarLoop]: Abstraction has 2169 states and 3008 transitions. [2021-11-23 17:17:05,205 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 3 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:05,205 INFO L276 IsEmpty]: Start isEmpty. Operand 2169 states and 3008 transitions. [2021-11-23 17:17:05,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2021-11-23 17:17:05,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:05,213 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 17:17:05,226 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-23 17:17:05,431 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:05,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:05,627 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:05,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:05,627 INFO L85 PathProgramCache]: Analyzing trace with hash -1917257571, now seen corresponding path program 1 times [2021-11-23 17:17:05,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:05,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1520351787] [2021-11-23 17:17:05,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:05,630 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:05,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:05,640 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:05,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:17:05,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:05,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:17:05,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:08,437 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 229 proven. 32 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2021-11-23 17:17:08,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:11,020 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 229 proven. 32 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2021-11-23 17:17:11,020 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:11,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1520351787] [2021-11-23 17:17:11,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1520351787] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:11,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1172657399] [2021-11-23 17:17:11,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:11,021 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:11,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:11,034 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:11,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-23 17:17:11,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:11,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:11,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:13,623 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 330 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:13,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:15,904 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 365 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:15,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1172657399] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:15,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1947254113] [2021-11-23 17:17:15,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:15,906 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:15,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:15,914 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:17:15,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 17:17:16,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:16,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:17:16,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:16,739 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 318 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 17:17:16,739 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:17:16,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1947254113] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:17:16,740 INFO L186 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2021-11-23 17:17:16,740 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 8, 8] total 15 [2021-11-23 17:17:16,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300546013] [2021-11-23 17:17:16,741 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:17:16,741 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:17:16,741 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:16,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:17:16,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=130, Unknown=0, NotChecked=0, Total=210 [2021-11-23 17:17:16,743 INFO L87 Difference]: Start difference. First operand 2169 states and 3008 transitions. Second operand has 3 states, 3 states have (on average 79.33333333333333) internal successors, (238), 3 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:37,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:37,507 INFO L93 Difference]: Finished difference Result 4633 states and 6767 transitions. [2021-11-23 17:17:37,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:17:37,512 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 79.33333333333333) internal successors, (238), 3 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 293 [2021-11-23 17:17:37,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:37,529 INFO L225 Difference]: With dead ends: 4633 [2021-11-23 17:17:37,529 INFO L226 Difference]: Without dead ends: 3066 [2021-11-23 17:17:37,532 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1460 GetRequests, 1447 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=80, Invalid=130, Unknown=0, NotChecked=0, Total=210 [2021-11-23 17:17:37,533 INFO L933 BasicCegarLoop]: 268 mSDtfsCounter, 273 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 344 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 1088 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 344 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:37,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [273 Valid, 333 Invalid, 1088 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [344 Valid, 744 Invalid, 0 Unknown, 0 Unchecked, 20.7s Time] [2021-11-23 17:17:37,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3066 states. [2021-11-23 17:17:37,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3066 to 2466. [2021-11-23 17:17:37,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2466 states, 2465 states have (on average 1.3626774847870182) internal successors, (3359), 2465 states have internal predecessors, (3359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:37,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2466 states to 2466 states and 3359 transitions. [2021-11-23 17:17:37,599 INFO L78 Accepts]: Start accepts. Automaton has 2466 states and 3359 transitions. Word has length 293 [2021-11-23 17:17:37,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:37,600 INFO L470 AbstractCegarLoop]: Abstraction has 2466 states and 3359 transitions. [2021-11-23 17:17:37,600 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 79.33333333333333) internal successors, (238), 3 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:37,601 INFO L276 IsEmpty]: Start isEmpty. Operand 2466 states and 3359 transitions. [2021-11-23 17:17:37,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2021-11-23 17:17:37,607 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:37,607 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:17:37,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:37,826 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:38,040 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-23 17:17:38,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:38,217 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:38,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:38,217 INFO L85 PathProgramCache]: Analyzing trace with hash -1834307786, now seen corresponding path program 1 times [2021-11-23 17:17:38,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:38,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2084791127] [2021-11-23 17:17:38,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:38,219 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:38,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:38,220 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:38,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:17:38,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:38,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:17:38,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:40,030 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 146 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 17:17:40,030 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:17:40,031 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:40,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2084791127] [2021-11-23 17:17:40,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2084791127] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:17:40,031 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:17:40,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:17:40,031 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753007355] [2021-11-23 17:17:40,031 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:17:40,032 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:17:40,032 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:40,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:17:40,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:17:40,033 INFO L87 Difference]: Start difference. First operand 2466 states and 3359 transitions. Second operand has 3 states, 3 states have (on average 97.0) internal successors, (291), 2 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:57,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:57,242 INFO L93 Difference]: Finished difference Result 5229 states and 7027 transitions. [2021-11-23 17:17:57,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:17:57,260 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 97.0) internal successors, (291), 2 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 346 [2021-11-23 17:17:57,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:57,275 INFO L225 Difference]: With dead ends: 5229 [2021-11-23 17:17:57,275 INFO L226 Difference]: Without dead ends: 2765 [2021-11-23 17:17:57,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:17:57,279 INFO L933 BasicCegarLoop]: 323 mSDtfsCounter, 105 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 887 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 887 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:57,280 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 358 Invalid, 892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 887 Invalid, 0 Unknown, 0 Unchecked, 17.2s Time] [2021-11-23 17:17:57,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2765 states. [2021-11-23 17:17:57,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2765 to 2765. [2021-11-23 17:17:57,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2765 states, 2764 states have (on average 1.32561505065123) internal successors, (3664), 2764 states have internal predecessors, (3664), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:57,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2765 states to 2765 states and 3664 transitions. [2021-11-23 17:17:57,342 INFO L78 Accepts]: Start accepts. Automaton has 2765 states and 3664 transitions. Word has length 346 [2021-11-23 17:17:57,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:57,343 INFO L470 AbstractCegarLoop]: Abstraction has 2765 states and 3664 transitions. [2021-11-23 17:17:57,344 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 97.0) internal successors, (291), 2 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:57,344 INFO L276 IsEmpty]: Start isEmpty. Operand 2765 states and 3664 transitions. [2021-11-23 17:17:57,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 421 [2021-11-23 17:17:57,352 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:57,353 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:17:57,365 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Ended with exit code 0 [2021-11-23 17:17:57,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:57,566 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:57,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:57,566 INFO L85 PathProgramCache]: Analyzing trace with hash -515771896, now seen corresponding path program 1 times [2021-11-23 17:17:57,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:57,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [101372978] [2021-11-23 17:17:57,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:57,568 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:57,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:57,569 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:57,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:17:57,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:57,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:17:57,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:59,143 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 111 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:59,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:10,539 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 111 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:10,540 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:10,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [101372978] [2021-11-23 17:18:10,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [101372978] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:10,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [660450979] [2021-11-23 17:18:10,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:10,541 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:10,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:10,541 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:10,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 17:18:10,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:10,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:18:10,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:13,201 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 111 proven. 0 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 17:18:13,201 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:13,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [660450979] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:13,201 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:18:13,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [3, 3] total 9 [2021-11-23 17:18:13,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772628743] [2021-11-23 17:18:13,202 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:13,202 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:18:13,203 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:13,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:18:13,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:18:13,204 INFO L87 Difference]: Start difference. First operand 2765 states and 3664 transitions. Second operand has 5 states, 5 states have (on average 66.0) internal successors, (330), 5 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:19,034 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:18:21,111 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:18:48,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:48,155 INFO L93 Difference]: Finished difference Result 6466 states and 8784 transitions. [2021-11-23 17:18:48,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:18:48,170 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 66.0) internal successors, (330), 5 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 420 [2021-11-23 17:18:48,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:48,189 INFO L225 Difference]: With dead ends: 6466 [2021-11-23 17:18:48,189 INFO L226 Difference]: Without dead ends: 4002 [2021-11-23 17:18:48,192 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1257 GetRequests, 1250 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:18:48,193 INFO L933 BasicCegarLoop]: 620 mSDtfsCounter, 322 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 2106 mSolverCounterSat, 238 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 322 SdHoareTripleChecker+Valid, 749 SdHoareTripleChecker+Invalid, 2344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 238 IncrementalHoareTripleChecker+Valid, 2106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 34.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:48,194 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [322 Valid, 749 Invalid, 2344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [238 Valid, 2106 Invalid, 0 Unknown, 0 Unchecked, 34.8s Time] [2021-11-23 17:18:48,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4002 states. [2021-11-23 17:18:48,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4002 to 3667. [2021-11-23 17:18:48,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3667 states, 3666 states have (on average 1.2744135297326786) internal successors, (4672), 3666 states have internal predecessors, (4672), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:48,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3667 states to 3667 states and 4672 transitions. [2021-11-23 17:18:48,278 INFO L78 Accepts]: Start accepts. Automaton has 3667 states and 4672 transitions. Word has length 420 [2021-11-23 17:18:48,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:48,279 INFO L470 AbstractCegarLoop]: Abstraction has 3667 states and 4672 transitions. [2021-11-23 17:18:48,280 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 66.0) internal successors, (330), 5 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:48,280 INFO L276 IsEmpty]: Start isEmpty. Operand 3667 states and 4672 transitions. [2021-11-23 17:18:48,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2021-11-23 17:18:48,293 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:48,294 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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, 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, 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] [2021-11-23 17:18:48,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:48,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:48,706 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:48,706 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:48,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:48,707 INFO L85 PathProgramCache]: Analyzing trace with hash -1934300512, now seen corresponding path program 1 times [2021-11-23 17:18:48,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:48,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [27077116] [2021-11-23 17:18:48,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:48,709 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:48,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:48,710 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:48,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 17:18:48,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:48,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:18:48,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:49,729 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 354 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 17:18:49,729 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:49,729 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:49,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [27077116] [2021-11-23 17:18:49,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [27077116] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:49,730 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:18:49,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:18:49,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701199062] [2021-11-23 17:18:49,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:49,731 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:18:49,731 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:49,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:18:49,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:18:49,731 INFO L87 Difference]: Start difference. First operand 3667 states and 4672 transitions. Second operand has 3 states, 3 states have (on average 148.0) internal successors, (444), 3 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:13,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:13,675 INFO L93 Difference]: Finished difference Result 8234 states and 10766 transitions. [2021-11-23 17:19:13,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:19:13,694 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 148.0) internal successors, (444), 3 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 499 [2021-11-23 17:19:13,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:13,729 INFO L225 Difference]: With dead ends: 8234 [2021-11-23 17:19:13,729 INFO L226 Difference]: Without dead ends: 4868 [2021-11-23 17:19:13,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:19:13,734 INFO L933 BasicCegarLoop]: 584 mSDtfsCounter, 252 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 918 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 621 SdHoareTripleChecker+Invalid, 1135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 918 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:13,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [252 Valid, 621 Invalid, 1135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 918 Invalid, 0 Unknown, 0 Unchecked, 23.9s Time] [2021-11-23 17:19:13,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4868 states. [2021-11-23 17:19:13,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4868 to 4864. [2021-11-23 17:19:13,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4864 states, 4863 states have (on average 1.2362739049969156) internal successors, (6012), 4863 states have internal predecessors, (6012), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:13,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4864 states to 4864 states and 6012 transitions. [2021-11-23 17:19:13,852 INFO L78 Accepts]: Start accepts. Automaton has 4864 states and 6012 transitions. Word has length 499 [2021-11-23 17:19:13,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:13,853 INFO L470 AbstractCegarLoop]: Abstraction has 4864 states and 6012 transitions. [2021-11-23 17:19:13,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 148.0) internal successors, (444), 3 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:13,854 INFO L276 IsEmpty]: Start isEmpty. Operand 4864 states and 6012 transitions. [2021-11-23 17:19:13,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 533 [2021-11-23 17:19:13,861 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:13,862 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:19:13,880 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:14,078 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:14,079 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:14,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:14,079 INFO L85 PathProgramCache]: Analyzing trace with hash 1940666773, now seen corresponding path program 1 times [2021-11-23 17:19:14,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:14,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [250132894] [2021-11-23 17:19:14,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:14,082 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:14,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:14,084 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:14,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 17:19:14,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:14,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 592 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:19:14,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:16,501 INFO L134 CoverageAnalysis]: Checked inductivity of 466 backedges. 304 proven. 106 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 17:19:16,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:29,124 INFO L134 CoverageAnalysis]: Checked inductivity of 466 backedges. 304 proven. 106 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 17:19:29,125 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:29,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [250132894] [2021-11-23 17:19:29,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [250132894] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:29,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2135879961] [2021-11-23 17:19:29,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:29,125 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:29,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:29,126 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:29,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 17:19:29,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:29,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 592 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:19:29,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:31,402 INFO L134 CoverageAnalysis]: Checked inductivity of 466 backedges. 167 proven. 0 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2021-11-23 17:19:31,403 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:19:31,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2135879961] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:19:31,403 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:19:31,403 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3] total 11 [2021-11-23 17:19:31,404 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531072383] [2021-11-23 17:19:31,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:19:31,404 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:19:31,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:31,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:19:31,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:19:31,406 INFO L87 Difference]: Start difference. First operand 4864 states and 6012 transitions. Second operand has 7 states, 7 states have (on average 47.285714285714285) internal successors, (331), 7 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:19:39,960 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.44s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:19:54,274 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.26s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:20:04,542 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:20:16,854 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.58s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:20:17,979 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.12s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:20:29,762 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:20:30,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:30,874 INFO L93 Difference]: Finished difference Result 12960 states and 16170 transitions. [2021-11-23 17:20:30,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:20:30,891 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 47.285714285714285) internal successors, (331), 7 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 532 [2021-11-23 17:20:30,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:30,924 INFO L225 Difference]: With dead ends: 12960 [2021-11-23 17:20:30,924 INFO L226 Difference]: Without dead ends: 8397 [2021-11-23 17:20:30,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1595 GetRequests, 1585 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2021-11-23 17:20:30,930 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 809 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 3869 mSolverCounterSat, 588 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 52.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 809 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 4458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 588 IncrementalHoareTripleChecker+Valid, 3869 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 59.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:30,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [809 Valid, 284 Invalid, 4458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [588 Valid, 3869 Invalid, 1 Unknown, 0 Unchecked, 59.2s Time] [2021-11-23 17:20:30,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8397 states. [2021-11-23 17:20:31,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8397 to 5765. [2021-11-23 17:20:31,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5765 states, 5764 states have (on average 1.2159958362248438) internal successors, (7009), 5764 states have internal predecessors, (7009), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:31,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5765 states to 5765 states and 7009 transitions. [2021-11-23 17:20:31,078 INFO L78 Accepts]: Start accepts. Automaton has 5765 states and 7009 transitions. Word has length 532 [2021-11-23 17:20:31,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:31,080 INFO L470 AbstractCegarLoop]: Abstraction has 5765 states and 7009 transitions. [2021-11-23 17:20:31,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 47.285714285714285) internal successors, (331), 7 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:31,080 INFO L276 IsEmpty]: Start isEmpty. Operand 5765 states and 7009 transitions. [2021-11-23 17:20:31,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 642 [2021-11-23 17:20:31,089 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:31,090 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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] [2021-11-23 17:20:31,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:31,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:31,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:31,505 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:31,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:31,505 INFO L85 PathProgramCache]: Analyzing trace with hash 1158358970, now seen corresponding path program 1 times [2021-11-23 17:20:31,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:31,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [360345860] [2021-11-23 17:20:31,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:31,508 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:31,508 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:31,509 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:31,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 17:20:31,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:31,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:20:31,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:34,352 INFO L134 CoverageAnalysis]: Checked inductivity of 907 backedges. 392 proven. 32 refuted. 0 times theorem prover too weak. 483 trivial. 0 not checked. [2021-11-23 17:20:34,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:36,931 INFO L134 CoverageAnalysis]: Checked inductivity of 907 backedges. 392 proven. 32 refuted. 0 times theorem prover too weak. 483 trivial. 0 not checked. [2021-11-23 17:20:36,931 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:36,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [360345860] [2021-11-23 17:20:36,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [360345860] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:36,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1536594421] [2021-11-23 17:20:36,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:36,931 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:36,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:36,932 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:36,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-11-23 17:20:37,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:37,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:20:37,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:39,256 INFO L134 CoverageAnalysis]: Checked inductivity of 907 backedges. 223 proven. 0 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2021-11-23 17:20:39,257 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:39,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1536594421] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:39,257 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:20:39,258 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3] total 11 [2021-11-23 17:20:39,258 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554204909] [2021-11-23 17:20:39,258 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:39,259 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:20:39,259 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:39,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:20:39,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:20:39,260 INFO L87 Difference]: Start difference. First operand 5765 states and 7009 transitions. Second operand has 7 states, 7 states have (on average 37.142857142857146) internal successors, (260), 7 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:04,790 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.65s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:21:06,440 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.65s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:21:21,494 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:21:23,221 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.73s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:21:24,303 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:21:25,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:25,614 INFO L93 Difference]: Finished difference Result 13604 states and 16295 transitions. [2021-11-23 17:21:25,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:21:25,631 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 37.142857142857146) internal successors, (260), 7 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 641 [2021-11-23 17:21:25,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:25,647 INFO L225 Difference]: With dead ends: 13604 [2021-11-23 17:21:25,647 INFO L226 Difference]: Without dead ends: 8140 [2021-11-23 17:21:25,653 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1923 GetRequests, 1912 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-11-23 17:21:25,654 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 1166 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 1974 mSolverCounterSat, 601 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 41.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1166 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 2576 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 601 IncrementalHoareTripleChecker+Valid, 1974 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 46.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:25,654 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1166 Valid, 146 Invalid, 2576 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [601 Valid, 1974 Invalid, 1 Unknown, 0 Unchecked, 46.1s Time] [2021-11-23 17:21:25,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8140 states. [2021-11-23 17:21:25,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8140 to 5165. [2021-11-23 17:21:25,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5165 states, 5164 states have (on average 1.1148334624322231) internal successors, (5757), 5164 states have internal predecessors, (5757), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:25,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5165 states to 5165 states and 5757 transitions. [2021-11-23 17:21:25,772 INFO L78 Accepts]: Start accepts. Automaton has 5165 states and 5757 transitions. Word has length 641 [2021-11-23 17:21:25,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:25,773 INFO L470 AbstractCegarLoop]: Abstraction has 5165 states and 5757 transitions. [2021-11-23 17:21:25,774 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 37.142857142857146) internal successors, (260), 7 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:25,774 INFO L276 IsEmpty]: Start isEmpty. Operand 5165 states and 5757 transitions. [2021-11-23 17:21:25,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 670 [2021-11-23 17:21:25,784 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:25,785 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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] [2021-11-23 17:21:25,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:25,996 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:26,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:26,187 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:26,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:26,188 INFO L85 PathProgramCache]: Analyzing trace with hash -1243875442, now seen corresponding path program 1 times [2021-11-23 17:21:26,190 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:26,190 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1039513532] [2021-11-23 17:21:26,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:26,190 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:26,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:26,191 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:26,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 17:21:26,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:26,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 747 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:21:26,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:29,122 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 499 proven. 32 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2021-11-23 17:21:29,122 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:31,693 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 499 proven. 32 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2021-11-23 17:21:31,693 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:31,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1039513532] [2021-11-23 17:21:31,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1039513532] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:31,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2024829039] [2021-11-23 17:21:31,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:31,694 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:31,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:31,695 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:31,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-23 17:21:32,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:32,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 747 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:21:32,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:35,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 728 proven. 232 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2021-11-23 17:21:35,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:38,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 728 proven. 232 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2021-11-23 17:21:38,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2024829039] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:38,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1422313066] [2021-11-23 17:21:38,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:38,941 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:38,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:38,942 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:38,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 17:21:39,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:39,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 747 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:21:39,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:40,783 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 691 proven. 0 refuted. 0 times theorem prover too weak. 524 trivial. 0 not checked. [2021-11-23 17:21:40,783 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:21:40,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1422313066] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:21:40,783 INFO L186 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2021-11-23 17:21:40,784 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 4, 4] total 12 [2021-11-23 17:21:40,784 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452543399] [2021-11-23 17:21:40,784 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:21:40,785 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:21:40,785 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:40,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:21:40,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-11-23 17:21:40,786 INFO L87 Difference]: Start difference. First operand 5165 states and 5757 transitions. Second operand has 3 states, 3 states have (on average 129.0) internal successors, (387), 3 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:44,603 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:21:51,066 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.22s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:22:08,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:08,096 INFO L93 Difference]: Finished difference Result 13014 states and 14475 transitions. [2021-11-23 17:22:08,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:22:08,100 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 129.0) internal successors, (387), 3 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 669 [2021-11-23 17:22:08,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:08,112 INFO L225 Difference]: With dead ends: 13014 [2021-11-23 17:22:08,112 INFO L226 Difference]: Without dead ends: 6954 [2021-11-23 17:22:08,117 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3340 GetRequests, 3330 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-11-23 17:22:08,118 INFO L933 BasicCegarLoop]: 585 mSDtfsCounter, 195 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 904 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 622 SdHoareTripleChecker+Invalid, 1107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 904 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:08,119 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 622 Invalid, 1107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 904 Invalid, 0 Unknown, 0 Unchecked, 27.2s Time] [2021-11-23 17:22:08,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6954 states. [2021-11-23 17:22:08,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6954 to 6655. [2021-11-23 17:22:08,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6655 states, 6654 states have (on average 1.0880673279230537) internal successors, (7240), 6654 states have internal predecessors, (7240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:08,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6655 states to 6655 states and 7240 transitions. [2021-11-23 17:22:08,246 INFO L78 Accepts]: Start accepts. Automaton has 6655 states and 7240 transitions. Word has length 669 [2021-11-23 17:22:08,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:08,247 INFO L470 AbstractCegarLoop]: Abstraction has 6655 states and 7240 transitions. [2021-11-23 17:22:08,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 129.0) internal successors, (387), 3 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:08,248 INFO L276 IsEmpty]: Start isEmpty. Operand 6655 states and 7240 transitions. [2021-11-23 17:22:08,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 684 [2021-11-23 17:22:08,259 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:08,261 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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, 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, 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] [2021-11-23 17:22:08,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:08,486 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Ended with exit code 0 [2021-11-23 17:22:08,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:08,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:08,882 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:08,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:08,883 INFO L85 PathProgramCache]: Analyzing trace with hash 1941988686, now seen corresponding path program 1 times [2021-11-23 17:22:08,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:08,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1517662384] [2021-11-23 17:22:08,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:08,886 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:08,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:08,888 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:08,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:22:09,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:09,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 743 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:22:09,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:11,470 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 465 proven. 106 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 17:22:11,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:23,457 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 465 proven. 106 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 17:22:23,458 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:23,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1517662384] [2021-11-23 17:22:23,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1517662384] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:23,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1746822948] [2021-11-23 17:22:23,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:23,458 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:23,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:23,459 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:23,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-23 17:22:24,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:24,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 743 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:22:24,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:26,626 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 465 proven. 106 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 17:22:26,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:38,421 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 465 proven. 106 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 17:22:38,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1746822948] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:38,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581619954] [2021-11-23 17:22:38,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:38,422 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:38,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:38,423 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:38,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-23 17:22:38,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:38,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 743 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:22:38,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:40,932 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 167 proven. 354 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2021-11-23 17:22:40,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:43,456 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 521 proven. 0 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2021-11-23 17:22:43,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1581619954] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:22:43,457 INFO L186 FreeRefinementEngine]: Found 1 perfect and 5 imperfect interpolant sequences. [2021-11-23 17:22:43,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 3, 3, 3] total 9 [2021-11-23 17:22:43,458 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875307278] [2021-11-23 17:22:43,458 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:43,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:22:43,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:43,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:22:43,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:22:43,459 INFO L87 Difference]: Start difference. First operand 6655 states and 7240 transitions. Second operand has 3 states, 3 states have (on average 192.66666666666666) internal successors, (578), 3 states have internal predecessors, (578), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:57,321 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.85s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:23:06,499 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.65s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:23:11,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:11,377 INFO L93 Difference]: Finished difference Result 15998 states and 17447 transitions. [2021-11-23 17:23:11,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:23:11,392 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 192.66666666666666) internal successors, (578), 3 states have internal predecessors, (578), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 683 [2021-11-23 17:23:11,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:11,409 INFO L225 Difference]: With dead ends: 15998 [2021-11-23 17:23:11,409 INFO L226 Difference]: Without dead ends: 9644 [2021-11-23 17:23:11,416 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4092 GetRequests, 4085 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:23:11,417 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 127 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 830 mSolverCounterSat, 313 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 1143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 313 IncrementalHoareTripleChecker+Valid, 830 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:11,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 154 Invalid, 1143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [313 Valid, 830 Invalid, 0 Unknown, 0 Unchecked, 27.8s Time] [2021-11-23 17:23:11,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9644 states. [2021-11-23 17:23:11,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9644 to 8448. [2021-11-23 17:23:11,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8448 states, 8447 states have (on average 1.0881969930152717) internal successors, (9192), 8447 states have internal predecessors, (9192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:11,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8448 states to 8448 states and 9192 transitions. [2021-11-23 17:23:11,585 INFO L78 Accepts]: Start accepts. Automaton has 8448 states and 9192 transitions. Word has length 683 [2021-11-23 17:23:11,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:11,586 INFO L470 AbstractCegarLoop]: Abstraction has 8448 states and 9192 transitions. [2021-11-23 17:23:11,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 192.66666666666666) internal successors, (578), 3 states have internal predecessors, (578), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:11,586 INFO L276 IsEmpty]: Start isEmpty. Operand 8448 states and 9192 transitions. [2021-11-23 17:23:11,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 691 [2021-11-23 17:23:11,598 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:11,600 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:23:11,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:11,840 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-11-23 17:23:12,024 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (23)] Ended with exit code 0 [2021-11-23 17:23:12,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:12,215 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:12,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:12,216 INFO L85 PathProgramCache]: Analyzing trace with hash -1974678694, now seen corresponding path program 1 times [2021-11-23 17:23:12,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:12,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2034318076] [2021-11-23 17:23:12,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:12,219 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:12,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:12,222 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:12,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:23:12,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:12,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 760 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:23:12,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:14,903 INFO L134 CoverageAnalysis]: Checked inductivity of 857 backedges. 554 proven. 106 refuted. 0 times theorem prover too weak. 197 trivial. 0 not checked. [2021-11-23 17:23:14,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:26,897 INFO L134 CoverageAnalysis]: Checked inductivity of 857 backedges. 554 proven. 106 refuted. 0 times theorem prover too weak. 197 trivial. 0 not checked. [2021-11-23 17:23:26,898 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:26,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2034318076] [2021-11-23 17:23:26,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2034318076] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:26,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [600755298] [2021-11-23 17:23:26,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:26,898 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:26,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:26,899 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:26,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-23 17:23:28,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:28,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 760 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:23:28,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:30,398 INFO L134 CoverageAnalysis]: Checked inductivity of 857 backedges. 554 proven. 106 refuted. 0 times theorem prover too weak. 197 trivial. 0 not checked. [2021-11-23 17:23:30,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:42,078 INFO L134 CoverageAnalysis]: Checked inductivity of 857 backedges. 554 proven. 106 refuted. 0 times theorem prover too weak. 197 trivial. 0 not checked. [2021-11-23 17:23:42,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [600755298] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:42,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1667462102] [2021-11-23 17:23:42,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:42,079 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:42,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:42,080 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:42,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 17:23:42,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:42,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 760 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:23:42,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:44,461 INFO L134 CoverageAnalysis]: Checked inductivity of 857 backedges. 526 proven. 169 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-23 17:23:44,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:46,138 INFO L134 CoverageAnalysis]: Checked inductivity of 857 backedges. 695 proven. 0 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-23 17:23:46,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1667462102] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:23:46,138 INFO L186 FreeRefinementEngine]: Found 1 perfect and 5 imperfect interpolant sequences. [2021-11-23 17:23:46,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 3, 3, 3] total 9 [2021-11-23 17:23:46,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711717831] [2021-11-23 17:23:46,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:23:46,140 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:23:46,140 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:46,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:23:46,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:23:46,141 INFO L87 Difference]: Start difference. First operand 8448 states and 9192 transitions. Second operand has 3 states, 3 states have (on average 176.66666666666666) internal successors, (530), 3 states have internal predecessors, (530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:12,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:12,490 INFO L93 Difference]: Finished difference Result 20482 states and 22277 transitions. [2021-11-23 17:24:12,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:24:12,495 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 176.66666666666666) internal successors, (530), 3 states have internal predecessors, (530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 690 [2021-11-23 17:24:12,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:12,515 INFO L225 Difference]: With dead ends: 20482 [2021-11-23 17:24:12,515 INFO L226 Difference]: Without dead ends: 12335 [2021-11-23 17:24:12,522 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4134 GetRequests, 4127 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:24:12,523 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 268 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 968 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 1124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 968 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 26.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:12,523 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [268 Valid, 203 Invalid, 1124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 968 Invalid, 0 Unknown, 0 Unchecked, 26.2s Time] [2021-11-23 17:24:12,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12335 states. [2021-11-23 17:24:12,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12335 to 10840. [2021-11-23 17:24:12,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10840 states, 10839 states have (on average 1.0810037826367747) internal successors, (11717), 10839 states have internal predecessors, (11717), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:12,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10840 states to 10840 states and 11717 transitions. [2021-11-23 17:24:12,722 INFO L78 Accepts]: Start accepts. Automaton has 10840 states and 11717 transitions. Word has length 690 [2021-11-23 17:24:12,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:12,723 INFO L470 AbstractCegarLoop]: Abstraction has 10840 states and 11717 transitions. [2021-11-23 17:24:12,723 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 176.66666666666666) internal successors, (530), 3 states have internal predecessors, (530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:12,724 INFO L276 IsEmpty]: Start isEmpty. Operand 10840 states and 11717 transitions. [2021-11-23 17:24:12,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 725 [2021-11-23 17:24:12,738 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:12,739 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 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, 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] [2021-11-23 17:24:12,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:12,980 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:13,157 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Ended with exit code 0 [2021-11-23 17:24:13,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:13,352 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:13,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:13,352 INFO L85 PathProgramCache]: Analyzing trace with hash 703970641, now seen corresponding path program 1 times [2021-11-23 17:24:13,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:13,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1067046076] [2021-11-23 17:24:13,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:13,357 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:13,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:13,358 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:13,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:24:13,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:13,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 800 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:24:13,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:16,306 INFO L134 CoverageAnalysis]: Checked inductivity of 1381 backedges. 515 proven. 32 refuted. 0 times theorem prover too weak. 834 trivial. 0 not checked. [2021-11-23 17:24:16,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:18,988 INFO L134 CoverageAnalysis]: Checked inductivity of 1381 backedges. 515 proven. 32 refuted. 0 times theorem prover too weak. 834 trivial. 0 not checked. [2021-11-23 17:24:18,988 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:18,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1067046076] [2021-11-23 17:24:18,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1067046076] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:18,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2134781159] [2021-11-23 17:24:18,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:18,989 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:18,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:18,990 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:18,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-23 17:24:20,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:20,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 800 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:24:20,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:23,263 INFO L134 CoverageAnalysis]: Checked inductivity of 1381 backedges. 842 proven. 232 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2021-11-23 17:24:23,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:26,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1381 backedges. 842 proven. 232 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2021-11-23 17:24:26,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2134781159] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:26,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [495829784] [2021-11-23 17:24:26,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:26,656 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:26,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:26,657 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:26,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-23 17:24:26,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:26,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 800 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:24:26,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:28,157 INFO L134 CoverageAnalysis]: Checked inductivity of 1381 backedges. 1025 proven. 0 refuted. 0 times theorem prover too weak. 356 trivial. 0 not checked. [2021-11-23 17:24:28,157 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:24:28,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [495829784] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:24:28,157 INFO L186 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2021-11-23 17:24:28,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 4, 4] total 12 [2021-11-23 17:24:28,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735371882] [2021-11-23 17:24:28,158 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:24:28,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:24:28,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:28,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:24:28,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-23 17:24:28,161 INFO L87 Difference]: Start difference. First operand 10840 states and 11717 transitions. Second operand has 3 states, 3 states have (on average 153.66666666666666) internal successors, (461), 3 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:53,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:53,184 INFO L93 Difference]: Finished difference Result 27370 states and 29510 transitions. [2021-11-23 17:24:53,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:24:53,185 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 153.66666666666666) internal successors, (461), 3 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 724 [2021-11-23 17:24:53,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:53,208 INFO L225 Difference]: With dead ends: 27370 [2021-11-23 17:24:53,208 INFO L226 Difference]: Without dead ends: 16532 [2021-11-23 17:24:53,216 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3615 GetRequests, 3605 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-23 17:24:53,217 INFO L933 BasicCegarLoop]: 533 mSDtfsCounter, 194 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 959 mSolverCounterSat, 155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 564 SdHoareTripleChecker+Invalid, 1114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 959 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:53,218 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 564 Invalid, 1114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 959 Invalid, 0 Unknown, 0 Unchecked, 24.9s Time] [2021-11-23 17:24:53,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16532 states. [2021-11-23 17:24:53,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16532 to 15627. [2021-11-23 17:24:53,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15627 states, 15626 states have (on average 1.0650198387303214) internal successors, (16642), 15626 states have internal predecessors, (16642), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:53,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15627 states to 15627 states and 16642 transitions. [2021-11-23 17:24:53,689 INFO L78 Accepts]: Start accepts. Automaton has 15627 states and 16642 transitions. Word has length 724 [2021-11-23 17:24:53,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:53,689 INFO L470 AbstractCegarLoop]: Abstraction has 15627 states and 16642 transitions. [2021-11-23 17:24:53,690 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 153.66666666666666) internal successors, (461), 3 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:53,690 INFO L276 IsEmpty]: Start isEmpty. Operand 15627 states and 16642 transitions. [2021-11-23 17:24:53,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 781 [2021-11-23 17:24:53,782 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:53,783 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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] [2021-11-23 17:24:53,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:54,015 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Ended with exit code 0 [2021-11-23 17:24:54,205 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Ended with exit code 0 [2021-11-23 17:24:54,394 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:24:54,395 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:54,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:54,396 INFO L85 PathProgramCache]: Analyzing trace with hash -642909024, now seen corresponding path program 1 times [2021-11-23 17:24:54,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:54,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1628515918] [2021-11-23 17:24:54,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:54,399 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:54,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:54,404 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:54,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 17:24:54,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:54,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 848 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:24:54,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:57,732 INFO L134 CoverageAnalysis]: Checked inductivity of 1030 backedges. 635 proven. 188 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2021-11-23 17:24:57,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:11,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1030 backedges. 635 proven. 188 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2021-11-23 17:25:11,328 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:11,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1628515918] [2021-11-23 17:25:11,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1628515918] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:11,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1734742169] [2021-11-23 17:25:11,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:11,329 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:11,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:11,330 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:11,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-23 17:25:12,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:12,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 848 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:25:12,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:15,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1030 backedges. 0 proven. 653 refuted. 0 times theorem prover too weak. 377 trivial. 0 not checked. [2021-11-23 17:25:15,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:18,141 INFO L134 CoverageAnalysis]: Checked inductivity of 1030 backedges. 597 proven. 56 refuted. 0 times theorem prover too weak. 377 trivial. 0 not checked. [2021-11-23 17:25:18,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1734742169] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:18,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [158142203] [2021-11-23 17:25:18,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:18,142 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:18,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:18,144 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:18,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23e7be4f-4563-476e-b255-5f3ce8fddc57/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-23 17:25:18,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:18,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 848 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:25:18,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:21,999 INFO L134 CoverageAnalysis]: Checked inductivity of 1030 backedges. 0 proven. 653 refuted. 0 times theorem prover too weak. 377 trivial. 0 not checked. [2021-11-23 17:25:21,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:25,633 INFO L134 CoverageAnalysis]: Checked inductivity of 1030 backedges. 597 proven. 56 refuted. 0 times theorem prover too weak. 377 trivial. 0 not checked. [2021-11-23 17:25:25,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [158142203] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:25,634 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:25,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 4, 5, 5, 5] total 17 [2021-11-23 17:25:25,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788727096] [2021-11-23 17:25:25,636 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:25,639 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 17:25:25,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:25,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 17:25:25,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:25:25,641 INFO L87 Difference]: Start difference. First operand 15627 states and 16642 transitions. Second operand has 17 states, 17 states have (on average 147.1764705882353) internal successors, (2502), 17 states have internal predecessors, (2502), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:26:26,946 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.89s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:27:04,883 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:27:07,180 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:27:09,183 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:27:26,879 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:27:35,397 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers []